Effect of Chronic Exenatide Therapy on Beta Cell Function and Insulin Sensitivity in T2DM

Inclusion Criteria: 1. BMI = 25-35 kg/m\^2 2. must be drug naïve and/or on a stable dose (more than 3 months) of metformin and/or sulfonylurea 3. HbA1c \>7.0% and \<10.0% 4. Other than diabetes, subjects must be in good general health as determined by physical exam, medical history, blood chemistries, CBC, TSH, T4, EKG and urinanalysis. 5. Only subjects whose body weight has been stable (± 3 lbs) over the preceding three months and who do not participate in an excessively heavy exercise program will be included. Exclusion Criteria: 1. Presence of significant systemic disease, heart problems including congestive heart failure, unstable angina or acute myocardial infarction, current infectious liver disease, acute stroke or transient ischemic attacks, history of pancreatitis, urosepsis and pyelonephritis, genital mycotic infections, or Type 1 diabetes mellitus 2. Any hepatic diseases in the past (infectious liver disease, viral hepatitis, toxic hepatic damage, jaundice of unknown etiology) or severe hepatic insufficiency and/or significant abnormal liver function tests defined as aspartate aminotransferase (AST) \>3x upper limit of normal (ULN) and/or alanine aminotransferase (ALT) \>3x ULN 3. Renal impairment (e.g., serum creatinine levels ≥1.4 mg/dL for women or ≥1.5 mg/dl for men, or eGFR \<60 mL/min/1.73 m2) or history of unstable or rapidly progressing renal disease or end stage renal disease. 4. Uncontrolled thyroid disease , Cushing's syndrome, congenital adrenal hyperplasia or hyperprolactinemia 5. Significantly elevated triglyceride levels (fasting triglyceride \> 400 mg/dl), uncontrolled increased LDL-C 6. Untreated or poorly controlled hypertension (sitting blood pressure \> 160/95 mm Hg) 7. Use of anti-obesity drugs or weight loss medications (prescription or OTC) and medications known to exacerbate glucose tolerance (such as isotretinoin, , GnRH agonists, glucocorticoids, anabolic steroids, C-19 progestins) stopped for at least 8 weeks. Use of anti-androgens that act peripherally to reduce hirsutism such as 5-alpha reductase inhibitors (finesteride, spironolactone, flutamide) stopped for at least 4 weeks 8. Prior history of a malignant disease requiring chemotherapy, prior history of bladder cancer regardless treatment 9. Patients at risk for volume depletion due to co-existing conditions or concomitant medications, such as loop diuretics should have careful monitoring of their volume status 10. History of unexplained microscopic or gross hematuria, or microscopic hematuria at visit 1, confirmed by a follow-up sample at next scheduled visit. 11. Presence of hypersensitivity to dapagliflozin or other SGLT2 inhibitors (e.g. anaphylaxis, angioedema, exfoliative skin conditions 12. Known hypersensitivity or contraindications to use GLP1 receptor agonists (exenatide, liraglutide) 13. Use of , thiazolidinediones, GLP-1 receptor agonists, DPP-4 inhibitors, SGLT2 inhibitors stopped for at least 8 weeks. 14. Eating disorders (anorexia, bulimia) or gastrointestinal disorders 15. Suspected pregnancy (documented negative serum β-hCG test), desiring pregnancy in next 6 months, breastfeeding, or known pregnancy in last 2 months 16. Active history of illicit substance abuse or significant intake of alcohol 17. Having a history of bariatric surgery 18. Patient not willing to use two barrier method contraception during study period (unless sterilized or have an IUD) 19. Debilitating uncontrolled psychiatric disorder such as psychosis or neurological condition that might confound outcome variables 20. Inability or refusal to comply with protocol 21. Current participation or participation in an experimental drug study in previous three months