Patients suffering from wheat-related troubles, in absence of celiac disease or wheat allergy diagnosis, can suffer from non-celiac wheat sensitivity (NCWS). This is characterized by both gastrointestinal (GI) and extra-intestinal symptoms, which improve with the elimination of wheat intake. To date no definitive explanation of pathogenetic mechanisms of NCWS has been proved, and, similarly, no specific non-invasive diagnostic biomarker has been recognized. A real need of strict adherence to wheat-free diet (WFD) in NCWS has never been demonstrated. In this context, research is actively trying to find wheat varieties with absent or low immune-reactivity to be used for the treatment of NCWS patients. Preliminary evidence supports the assumption that diploid wheat species, as Triticum monococcum (TM), compared to common ones (Triticum aestivum (TA), could possess a lower immunogenic potential in NCWS patients. The first objective of our project is to verify whether the use of a diploid wheat (TM), with a lower concentrations and bioactivity of Amylase-Trypsin-Inhibitors (ATIs) and with gliadin proteins with a better digestibility, compared to a hexaploid one (TA) could improve both symptoms and quality of life (QoL) of NCWS subjects. The second objective is the identification of non-invasive serological biomarkers for NCWS diagnosis. The third objective is to identify T cell lymphocytes able to recognize cognate peptides from wheat proteins to better classify and monitor patients affected by NCWS. To achieve these results we planned a prospective, double-blind clinical trial with crossover, in which patients already diagnosed with NCWS (according to international criteria and with a double-blind placebo-controlled wheat challenge), following a strict WFD, will be exposed in double-blind to both TM and TA. All the patients will be evaluated clinically at the different timepoints with validated scales to assess tolerability of TM. Moreover, their intestinal permeability, immunological activation and gut microbiota patterns will be studied by both in vitro and in vivo techniques. Finally, a randomly chosen subset of patients will be studied through single cell transcriptome and T-cell receptor (TCR) sequencing on rectoscopy biopsy specimens to identify, T cell lymphocytes able to recognize cognate peptides from wheat proteins.
State of the art The association between wheat intake and "wheat-related disorders" (WRDs) has been known for a long time, including pathologies as celiac disease (CD) and wheat allergy (WA). Recently a new non-allergic and non-autoimmune condition has been identified: non-celiac gluten sensitivity (NCGS). This is characterized by both gastrointestinal (GI) symptoms, very similar to those of irritable bowel syndrome (IBS) (eg. abdominal pain, diarrhea, etc.), and extra-intestinal ones (eg. arthromyalgias, anemia, etc.), which improve on a wheat-free diet (WFD). NCGS prevalence rates range from 0.6% to 13% in the general population, and given the lack of a biomarker, its diagnosis is based on: 1) exclusion of CD and WA; 2) symptom's regression on a WFD; 3) recurrence of symptoms on a double-blind placebo-controlled challenge (DBPCC) with wheat. Physicians recognize a significant overlap between NCGS and IBS and it is known that IBS affects about 25% of the general population. So, if a percentage of IBS patients could have benefit from a WFD, this would have a paramount impact on its social health costs, being estimated that its indirect costs (eg. loss of work and reduced productivity) are up to $20 billion/years in the US, with an annual cost of $9933 per patient. Furthermore, many patients with IBS-like or upper gastro-esophageal functional-like manifestations self-report a relationship between symptoms onset and wheat ingestion (wheat-intolerance). Nevertheless, a clinical approach with a WFD for all IBS patients would be unmotivated and dangerous, determining also a great economic burden. In most IBS patients, visceral hypersensitivity may contribute to GI symptoms. Immune activation, due to mucosal mast cells (MCs) in close vicinity to gut nerves, appears to play a role in IBS symptom's onset. A possible neuro-immune interaction in the duodenal submucosa of NCGS patients involving MCs has been described, in order to explain GI symptoms. Other findings in NCGS include an increased infiltration of eosinophils in GI tract, which might produce several inflammatory (ie. eosinophil cationic protein (ECP) and tryptase) and neuromodulatory substances (eg. substance P and VIP). Several studies have investigated the performance of serum biomarkers panels in differentiating IBS from NCGS and healthy subjects. These included inflammatory cytokines, chemokines, neurotransmitters and antibodies associated with CD. Therefore, it is critically important to investigate the performance of serum biomarkers panels to differentiate "real NCGS" from other conditions. Having not definitively established whether gluten or some other wheat's component is responsible for symptom's triggering, NCGS has been renamed as non-coeliac wheat sensitivity (NCWS), which would exclude other relevant cereals, such as barley and rye. Some components of wheat other than gluten proteins could be potentially deleterious for NCWS patients, which include fermentable short-chain carbohydrates (FODMAPs) and amylase trypsin inhibitors (ATIs); the latter, activating toll-like receptor 4 complex in monocytes, macrophages and dendritic cells of the intestinal mucosa, might induce innate immunity in both CD and healthy subjects. Finally, some authors have focused on the activation of innate and/or acquired immunity, or gut microbiota modifications. Research is actively trying to find wheat varieties with absent or low immune reactivity to be used to treat patients with NCWS. Preliminary evidence showed that diploid wheat species, as Triticum monococcum (TM), compared to common ones (Triticum aestivum (TA) and Triticum durum), could possess a lower immunogenic potential in NCWS and IBS patients. It seems that modern wheats contain higher concentrations and bioactivity of ATIs compared with diploid ones, and that gliadin from TM retain a reduced number of immunogenic peptides for CD patients due to a high in vitro digestibility. We found that ATIs from TM are sufficiently different than those from TA, so to determine lack of immune toxicity in CD after proteolytic digestion. Moreover, some data showed that in IBS the consumption of ancient wheat can reduce symptoms and proinflammatory cytokines and improves intestinal dysbiosis. In this context, we have recently shown that NCWS patients who consume ancient grains may receive a late diagnosis due to the possible clinical benefit (tolerability) obtained with these grains. All these data, however, must be considered preliminary and the pathogenetic mechanisms and the real clinical tolerability of the ancient wheats remain to be confirmed. Thus, it is very important to evaluate the hypothesis that specific ancient wheat varieties could be tolerated and safe for NCWS patients, trying to identify, at the same time, possible non-invasive biomarkers to diagnose and differentiate NCWS from IBS patients. Hypotheses and objectives Our hypothesis is that a dietary therapeutic approach based on the use of a diploid wheat (TM), with a lower concentrations and bioactivity of ATIs and with gliadin proteins with a better digestibility, could improve symptoms and quality of life (QoL) of NCWS patients. We planned to perform a Double-Blind Wheat Challenge (DBWC), with crossover of 2 wheat varieties (TM vs TA), in patient diagnosed with NCWS according to Salerno criteria (6), to assess the putative clinical tolerability of TM, and analyze the immunological, intestinal permeability and microbial differences, trying to identify both the pathogenetic mechanisms and potential diagnostic biomarkers of NCWS, helping in distinguishing NCWS from IBS patients. If confirmed, a dietary regimen with TM would be a more suitable and a less expensive alternative to a WFD, and the identification of a biomarker for NCWS will reduce the number of medical visits and examinations, with substantial economic savings for the national health systems. Furthermore, the putative beneficial effect of a diet based on a regional ancient wheat variety will contribute to the regional agriculture and food economy. The overarching objective of the study is to investigate in NCWS patients if a challenge with an ancient wheat (TM) compared to a modern one (TA), have a lower symptom's response, reflecting visceral hypersensitivity, immune activation and distinct microbial profiles, in order to guarantee these patients a consistent alternative to WFD and increase their QoL. The second objective is the identification of non-invasive serological biomarkers for NCWS diagnosis. The third objective is to identify, through single cell (sc) transcriptome and T-cell receptor (TCR) sequencing, T cell lymphocytes able to recognize cognate peptides from wheat proteins to better classify patients affected by NCWS, with a translational relevance for future tailored therapies. The experimental plan is divided into 4 work packages (WPs). Within each WP, a series of tasks have been defined. WP1: evaluation of clinical response to TM compared to TA in NCWS patients by a DBWC with crossover. Task 1.1: evaluation of GI symptoms evoked by dietary exposition to TM and TA by a validated GI symptoms rating scale. Task 1.2: evaluation of extraintestinal symptoms evoked by dietary exposition to TM and TA by an extraintestinal symptoms rating scale. Task 1.3: evaluation of QoL modifications determined by dietary exposition to TM and TA by a QoL validated scale. WP2: evaluation of intestinal permeability and damage biomarkers in NCWS patients under 3 dietary regimens: WFD, TM and TA challenge. Task 2.1: in vivo evaluation of intestinal permeability by the Lactulose/Mannitol (La/Ma) ratio test. Task 2.2: analysis of serological indexes of intestinal damage and permeability, by ELISA assays. WP 3: Evaluation of immunological, inflammatory, and visceral hypersensitivity response in NCWS patients under 3 dietary regimens: WFD, TM and TA challenge. Task 3.1: analysis of fecal and plasmatic biomarkers of visceral hypersensitivity by ELISA assays. Task 3.2: analysis of the humoral immune response to gluten by ELISA assays Task 3.3: analysis of serological inflammatory biomarkers by simultaneous high sensitivity microsphere-based Luminex technology and ELISA assays. Task 3.4: immunophenotyping of whole blood for quantification of immune cell (IC) subpopulations and their activation status, evaluation of gut homing biomarkers and identification of specific cell population involved in the systemic immune response to wheat. Task 3.5: Identification, through single cell (sc) transcriptome and TCR sequencing, of T cell lymphocytes able to recognize cognate peptides from wheat proteins, in the rectal mucosa of NCWS subjects. WP4: evaluation of gut microbiota in NCWS patients under 3 different dietary regimens: WFD, TM and TA challenge. Task 4.1: in vitro amplification of bacterial genetic materials from fecal samples by polymerase chain reaction (PCR) methods and identification of gut microbiota composition.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
DIAGNOSTIC
Masking
QUADRUPLE
Enrollment
68
Patients will be administered a daily dose of 80g of flour of Triticum Monococcum (equivalent to 10g of gluten), which will be dissolved and cooked by the patients themselves. During the challenge, the severity of the symptoms will be recorded using a 10-points visual analog scale (VAS). The challenges will be stopped when clinical reactions will occur for at least 2 consecutive days (increase \>3 in VAS) for either GI or extraintestinal symptoms. Challenges will be considered positive if symptoms, which had been initially present, reappear after their disappearance on elimination diet, and if the GI and/or extraintestinal symptom's scores will be \>30% compared to any eventual increase determined during the administration of the other wheat variety.
Patients will be administered a daily dose of 80g of flour of Triticum Aestivum (equivalent to 10g of gluten), which will be dissolved and cooked by the patients themselves. During the challenge, the severity of the symptoms will be recorded using a 10-points visual analog scale (VAS). The challenges will be stopped when clinical reactions will occur for at least 2 consecutive days (increase \>3 in VAS) for either GI or extraintestinal symptoms. Challenges will be considered positive if symptoms, which had been initially present, reappear after their disappearance on elimination diet, and if the GI and/or extraintestinal symptom's scores will be \>30% compared to any eventual increase determined during the administration of the other wheat variety.
University Hospital of Palermo
Palermo, Sicily, Italy
RECRUITINGEvaluation of gastrointestinal symptoms evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum
A modified version of Gastrointestinal Symptom Rating Scale (GSRS) will be administered to all the patients during each outpatient visit to assess gastrointestinal symptoms before the challenge (T0, wheat free diet) and after exposure to both Triticum Monococcum (TM) and Triticum Aestivum (TA). Difference will be considered relevant if GSRS will be recorded \>30% compared to T0 and/or to any eventual increase determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Evaluation of extraintestinal symptoms evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum
A extraintestinal symptoms rating scale, based on the symptoms most frequently observed in NCWS patients, will be administered to all the patients during each outpatient visit to assess gastrointestinal symptoms before the challenge (T0, wheat free diet) and after exposure to both Triticum Monococcum (TM) and Triticum Aestivum (TA). Difference will be considered relevant if extraintestinal symptoms rating scale will be recorded \>30% compared to T0 and/or to any eventual increase determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Evaluation of quality of life modification evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum
The Irritable Bowel Syndrome-Quality of Life (IBS-QoL) will be used to assess patient's QoL. It is an already validated condition-specific tool for IBS patients, which incorporates specific subdomains, such as food avoidance, bowel habits, and the effect on the social/sexual relationships. IBS-QoL will be administered to all the patients during each outpatient visit to assess gastrointestinal symptoms before the challenge (T0, wheat free diet) and after exposure to both Triticum Monococcum (TM) and Triticum Aestivum (TA). Difference will be considered relevant if IBS-QoL will be recorded \>30% compared to T0 and/or to any eventual increase determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
In vivo evaluation of intestinal permeability modification evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum
In vivo evaluation of intestinal permeability will be performed using the Lactulose/Mannitol (La/Ma) ratio test, which has already been validated for gluten-related disorders, and other GI diseases with diarrhea and malabsorption. The test is based on the oral administration (after 12 hours of fasting) of an aqueous isosmolar solution (270mOsm) of 2 non-absorbable sugars (5g lactulose and 2g mannitol), in 150ml of water. Not being metabolizable, the 2 sugars are filtered by the kidneys and found in the urine; a urine collection for 5 hours after the bolus contains everything that has been filtered, with a La/Ma ratio \<0.035, which is considered the "normal" intestinal permeability index (values ≥0.035 will be considered as index of increased GI permeability). La/Ma ratio difference will be considered relevant for p\<0.05 compared to T0 values and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of serological indexes of intestinal permeability evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: zonulin
Zonulin dosage will be performed by commercial ELISA kits according to the manufacturer's instructions. Zonulin values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of serological indexes of intestinal permeability evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: occludin
Occludin dosage will be performed by commercial ELISA kits according to the manufacturer's instructions. Occludin values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
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Analysis of modification of serological indexes of intestinal permeability evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: claudin 1
Claudin 1 dosage will be performed by commercial ELISA kits according to the manufacturer's instructions. Claudin 1 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of serological indexes of intestinal injury evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: intestinal fatty acid-binding protein
intestinal fatty acid-binding protein dosage will be performed by commercial ELISA kits according to the manufacturer's instructions. intestinal fatty acid-binding protein values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of serological indexes of intestinal injury evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: lipopolysaccharide
lipopolysaccharide dosage will be performed by commercial ELISA kits according to the manufacturer's instructions. lipopolysaccharide values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of serological indexes of intestinal injury evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: lipopolysaccharide binding-protein
lipopolysaccharide binding-protein dosage will be performed by commercial ELISA kits according to the manufacturer's instructions. lipopolysaccharide binding-protein values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of serological indexes of intestinal injury evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: F-actin immunoglobulin (Ig)A
F-actin immunoglobulin (Ig)A dosage will be performed by commercial ELISA kits according to the manufacturer's instructions. F-actin immunoglobulin (Ig)A values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of serological indexes of intestinal injury evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: F-actin immunoglobulin (Ig)G
F-actin immunoglobulin (Ig)G dosage will be performed by commercial ELISA kits according to the manufacturer's instructions. F-actin immunoglobulin (Ig)G values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of gut hypersensitivity indexes evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: eosinophil cationic protein
Eosinophil cationic protein dosage will be performed on stool samples following already validated methodologies. Eosinophil cationic protein values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of gut hypersensitivity indexes evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: tryptase
Tryptase dosage will be performed on stool samples following already validated methodologies. Tryptase values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of gut hypersensitivity indexes evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: substance P
Substance P dosage will be performed on blood samples by commercial ELISA kits according to the manufacturer's instructions. Substance P values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of gut hypersensitivity indexes evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: somatostatin
Somatostatin dosage will be performed on blood samples by commercial ELISA kits according to the manufacturer's instructions. Somatostatin values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of gut hypersensitivity indexes evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: serotonin
Serotonin dosage will be performed on blood samples by commercial ELISA kits according to the manufacturer's instructions. Serotonin values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of gut hypersensitivity indexes evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: vasoactive intestinal peptide
Vasoactive intestinal peptide dosage will be performed on blood samples by commercial ELISA kits according to the manufacturer's instructions. Vasoactive intestinal peptide values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the humoral immune response to gluten evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: anti-gliadin antibodies immunoglobulin A
Humoral immune response to gluten will be evaluated by dosing plasmatic levels of anti-gliadin antibodies immunoglobulin A by commercial ELISA assays, following manufacturer's instructions. Anti-gliadin antibodies immunoglobulin A values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the humoral immune response to gluten evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: anti-gliadin antibodies immunoglobulin G
Humoral immune response to gluten will be evaluated by dosing plasmatic levels of anti-gliadin antibodies immunoglobulin G by commercial ELISA assays, following manufacturer's instructions. Anti-gliadin antibodies immunoglobulin G values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: granulocyte colony-stimulating factor
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. Granulocyte colony-stimulating factor values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: granulocyte-macrophage colony-stimulating factor
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. Granulocyte-macrophage colony-stimulating factor values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interferon (IFN)-γ
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. Interferon (IFN)-γ values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-1β
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-1β values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-2
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-2 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-4
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-4 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-5
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-5 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-6
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-6 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-8
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-8 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-9
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-9 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-10
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-10 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-12
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-12 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-13
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-13 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-15
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-15 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-17
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-17 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-21
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-21 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-22
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-22 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: interleukin (IL)-33
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. interleukin (IL)-33 values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of modification of the serological inflammatory biomarkers evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum: tumor necrosis factor (TNF)-α
Expression of serological inflammatory biomarkers will be evaluated, on all the samples collected, by multiplexing simultaneous analysis with high sensitivity microsphere-based assays or ELISA. Tumor necrosis factor (TNF)-α values difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of immunophenotyping of whole blood for quantification of immune cell (IC) subpopulations modification and their activation status evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum
Immunophenotyping will be performed by multi-color flow cytometry. Blood will be stained with fluorochrome conjugated antibodies specific for surface markers of cell population lineages and immune activation to allow the quantification of immune cell populations and their activation status Immune cell populations difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Identification of T cell lymphocytes able to recognize cognate peptides from wheat proteins
To identify T cells able to recognize cognate peptides from wheat proteins, CD45+ immune cells will be collected from rectal biopsy specimens obtained from 10 patients, at baseline and when they will report symptom's recurrence on double-blind wheat challenge. Rectal biopsies will be transferred in complete culture medium, minced into small pieces, followed by enzymatic digestion. Then CD45+ fraction will be sorted and used for subsequent -omic analyses. Immune cells obtained from the biopsies will undergo Single Cell characterization, aiming to investigate changes in the immune microenvironment, by CITE-seq and TCR-seq analyses. To gain insight into T Cell Receptor sequences able to recognize putative peptides originated from the main wheat proteins (gluten, etc.), we will develop a neural network/docking predictive model for TCR/epitope interaction. The final wheat peptides candidates will be then validated in vitro by using an Elispot assay.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)
Analysis of gut microbiota modification evoked by dietary exposition to Triticum Monococcum and Triticum Aestivum
in vitro identification of gut microbiota will be performed by amplification, analysis and quantification of gut microbiome on stools samples. After fecal collection, bacterial DNA will be extracted by cetyltrimethyl ammonium bromide, and 16S rDNA sequencing will be performed by polymerase chain reaction (PCR) methods, using universal primers. The resulting fragments will be then sequenced by pyrosequencing. Each reading will be compared with a database of known 16S rDNA sequences, using the BLAT program by phylogenetically assigning the most specific and reliable nodes. This method of assigning the obtained data leads to a "weighted" phylogenetic tree that characterizes well the bacterial content of the sample. Gut microbiota difference will be considered relevant for p\<0.05 compared to values registered at T0 and/or to the values determined during the administration of the other wheat variety.
Time frame: Days 0 (before start of challenge), 7 (after intake of first kind of flour according randomization) and 21 (after intake of second kind of flour according randomization)