Reducing Metabolic Dysregulation in Dyads

Overview

This study is a 6-month randomized controlled trail of diet modification designed to reduce chronic inflammation and reverse metabolic dysfunction among obese individuals with one or more polyps found at a colonoscopy screening. We also will recruit an at least overweight partner, who lives in the same household. To be eligible, participants will be apparently disease-free, obese AAs or EAs who have self-identified a partner who is at least 9 years, with whom they live and who also is at least overweight. Each index participant will: 1) Be AA or EA by self-report; 2) Be ≤55 years old; 3) Have undergone a colonoscopy screening and found to have ≥1 polyp(s); 4) Be free of co-morbid conditions or other factors that would limit participation in this trial; 5) Have a BMI ≥30kg/m2; 6) Be willing to commit to investing the time and effort required to participate in this trial (i.e., willing to complete all assessments and provide biological samples as specified in the consent); and 7) Have no recent antibiotic use. Their partner needs to: 1) Be at least 9 years old; 2) Live in the same household and consumes meals together; 3) Be at least overweight; 4) Agree to all study procedures, including provision of biological samples, body measurements, and self-reported dietary and other assessments; and 5) Have no recent antibiotic use.

This project leverages our expertise in the epidemiology of colorectal cancer (CRC); disparities; obesity; metabolic dysregulation, an important manifestation of inflammation; the microbiome; animal CRC models; and lifestyle intervention trials to address the growing problem of Early-Onset CRC (EOCRC) (i.e., \<50 years). Adiposity and diet drive metabolic dysregulation. So, understanding the interaction between diet and adiposity are key to understanding the genesis of EOCRC - and an array of other obesity-related cancers. This project will address the absence of critical clinical trials and mechanistic studies involving lifestyle interventions for EOCRC. We intend to address this gap; and have the transdisciplinary team representing complementary backgrounds to do so. We focus on dietary modulation of gut microbes to reduce metaflammation and subsequent metabolic dysfunction in obesity, with a goal of preventing EOCRC. We will perform an anti-inflammatory dietary intervention trial in dyads of adults and children at elevated risk for CRC. We also will conduct a complementary mechanistic animal study that builds on and leverages our expertise in mechanistic studies on obesity and CRC. This work is supported by infrastructure that we have built over the past decades in two key centers at the University of South Carolina (USC): (1) Center for Colon Cancer Research (CCCR, 2002 - present - which specializes in mouse models of CRC); and (2) the Cancer Prevention and Control Program (CPCP, 2003 - present - which specializes in the epidemiology of cancer and lifestyle intervention trials for cancer, with a focus on cancer disparities). The two projects that comprise the proposed grant address two Specific Aims that are represented by the human study and laboratory animal experiment: i.e. ,1: To establish the metabolic protective effects of an anti-inflammatory diet in obese, high-risk African-American (AA) and European-American (EA) adults and children in reducing inflammation as indicated by Homeostatic Model Assessment for Insulin Resistance (HOMA-IR), IGF-1, Tumor Necrosis Factor alpha (TNFα), Interleukin 6 (IL-6), and C-Reactive Protein (CRP), and a creating more favorable microbiome signature; 2: To establish gut microbes as mediators between anti-inflammatory dietary input and reversal of metabolic dysfunction and associated CRC risk. This complements the human study by carrying out pre-clinical murine model studies with similar inputs (diet), intermediate endpoints (inflammation, microbiome), and outcomes (CRC-related). We hypothesize that an anti-inflammatory dietary intervention will reduce metabolic dysfunction and metainflammation through regulatory effects on gut microbiota. Results from this work will address the role of metabolic dysregulation in relation to factors that are known to be important in carcinogenesis, that therefore could have profound effects on EOCRC, have implications for other obesity-related cancers, and have great promise for moving the field forward by addressing mechanisms that drive large health-related disparities that consistently disfavor African Americans.