Pharmacology General 3f0978cd GLP - 1 is broken down by A α - glucosidase B Rasburicase C Dipeptidyl peptidase D Glucose 1 phosphatase High-Yield Explanation GLP - 1 is a peptide hormone released from intestinal cells that act on β - cells to release insulin. It is rapidly broken down by Dipeptidyl peptidase 4 (DPP - 4).