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Type 2 diabetes mellitus (T2DM) is a risk factor for Alzheimers disease (AD). Glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) have been shown to have neuroprotective properties by binding to their respective receptors in the brain. However, the native GLP-1 and GIP can be rapidly degraded by the enzyme dipeptidyl peptidase Ⅳ (DPP-Ⅳ).