Dupilumab on Airway Hyper-responsiveness and Ventilation Heterogeneity in Patients With Asthma.

Inclusion Criteria: * General 1. Able and willing to provide written informed consent. 2. Able and willing to comply with the study protocol. 3. Males and females ≥ 18 years of age. Asthma-related 4. Asthma diagnosed by a respiratory physician ≥ 12 months prior to study enrolment based on the Global Initiative for Asthma (GINA) 2014 guidelines. 5. ACQ \> 1 during the screening period. 6. Airway hyperresponsiveness (methacholine PC20 ≤ 4 mg/mL OR ≥15% decreased in FEV1 during saline inhalation for sputum induction OR ≥25% improvement in FEV1 after bronchodilator) during the screening period. 7. Fraction of exhaled nitric oxide (FeNO) \>25 ppb and either ≥3% sputum eosinophils (preferred) OR blood eos ≥300/µL during the screening period. 8. Inhaled corticosteroids (ICS) dose ≥500 mcg of fluticasone equivalent/day. Patients on prednisone would not be excluded as long as they meet the rest of the inclusion criteria. Exclusion Criteria: * Patients who meet any of the following criteria will be excluded from study entry: Prior Medical Conditions and Treatment History 1. Acute or chronic parasitic, bacterial, fungal or viral infections that required, or currently requires, hospitalization or antimicrobial treatment during the last four weeks. 2. Acute asthma exacerbation event treated with increased doses of oral, or any dose of intramuscular (IM) or intravenous (IV) corticosteroids within six weeks prior to screening. 3. Other relevant pulmonary diseases (e.g. chronic obstructive pulmonary disease, idiopathic pulmonary fibrosis, cystic fibrosis, pulmonary arterial hypertension, tuberculosis) requiring treatment within 12 months prior to screening. 4. Alcohol or substance abuse within 12 months prior to screening. 5. Current smoker defined as having smoked at least one cigarette (or pipe, cigar, or marijuana) per day for ≥ 30 days within the three months prior to screening. 6. Ex-smokers with ≥ 10 pack-year smoking history. 7. Treatment with anti-IgE (immunoglobulin E), anti-IL-4, anti-IL-5 (interleukin-5), or anti-IL-13 targeted therapy currently or within three months prior to screening. 8. ACQ \> 3.0 MRI (Magnetic Resonance Imaging )Related 9. Patient has an implanted mechanically, electrically or magnetically activated device or any metal in their body which cannot be removed, including but not limited to pacemakers, neurostimulators, biostimulators, implanted insulin pumps, aneurysm clips, bioprosthesis, artificial limb, metallic fragment or foreign body, shunt, surgical staples (including clips or metallic sutures and/or ear implants) (at the discretion of the MRI Technologist). 10. In the investigator's opinion, subject suffers from any physical, psychological or other condition(s) that might prevent performance of the MRI, such as severe claustrophobia. General 11. Participation in any clinical trial of an investigational agent or procedure within six months prior to screening or during the study.