P30: PYY HORMONE UPREGULATES PROXIMAL GLP-1 RELEASE AFTER ROUX EN-Y GASTRIC BYPASS

Nowadays Roux-en-Y gastric bypass (RYGB) has provided a powerful treatment for type 2 diabetes mellitus. Nevertheless how anatomical arrangements after RYGB influeces entero-hormonal response and the role of Peptide Tyrosine Tyrosine (PYY) in the restoration of normoglycaemia are still not clear. MATERIAL AND Method We demonstrate that PYY plasma levels showed a remarkable peak, around thirty minutes earlier than GLP-1 or GIP, after mixed-meal administration in non obese Goto – Kakizaki RYGB-operated rats . Also, we found that PYY (3-36) infusion led to increased GLP-1 and GIP plasma levels close to those obtained after a meal. Result Histologically the number of GLP-1 positive cells number appeared to increase in the three segments of the small intestine:duodenum jejunum and ileum in GK RYGB-operated rats beyond early presence of nutrient stimulation in the ileum. But nevertheless, PYY positive cell numbers appeared to increased only in the ileum. Conclusion Taking together this findings suggest an earlier central role for PYY in gut hormone regulation after RYGB in our model, contributing to GLP-1 and GIP release and support the existence of enteroendocrine communication routes between the distal and proximal small intestine. Take-home message Enterohormones release changes after bariatric surgery due to the consequences in nutrients flow. The GLP-1 release is increased and we report its related to the PYY regulation.