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Glucagon-like Receptor Agonists01:24

Glucagon-like Receptor Agonists

Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
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Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a significant...
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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
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Hormones Regulating Blood Glucose01:16

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Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
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Two...
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GLP-1 C-terminal structures affect its blood glucose lowering-function.

Yuan Li1, Changhong Shi, Qiujun Lv

  • 1Dalian DN Bio-Engineering Co., Ltd., Dalian, Liaoning, PRC.

Journal of Peptide Science : an Official Publication of the European Peptide Society
|January 18, 2008
PubMed
Summary
This summary is machine-generated.

A modified GLP-1 peptide, sGLP-1, shows superior long-term blood glucose control in type 2 diabetes models. This shorter analog promotes islet cell health and function, offering a more efficient treatment option.

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Area of Science:

  • Endocrinology
  • Pharmacology
  • Diabetes Research

Background:

  • Glucagon-like peptide-1 (GLP-1) is a key hormone for insulin secretion, but its short half-life limits its use in type 2 diabetes treatment.
  • Developing stable GLP-1 analogs is crucial for effective diabetes management.

Purpose of the Study:

  • To investigate the therapeutic potential of a truncated GLP-1 analog (sGLP-1) in a type 2 diabetes model.
  • To compare the efficacy of sGLP-1 with native GLP-1 in managing blood glucose levels and improving islet cell function.

Main Methods:

  • Administration of sGLP-1 and GLP-1 to GK rats with type II diabetes mellitus (T2DM).
  • Monitoring of blood glucose levels over a two-week period.
  • Assessment of islet cell apoptosis, insulin production, and replication.

Main Results:

  • Initially, sGLP-1 showed less potent glucose-lowering effects than GLP-1.
  • After two weeks, sGLP-1 demonstrated superior blood glucose-lowering efficacy.
  • sGLP-1 reduced islet cell apoptosis, enhanced insulin secretion, and promoted islet cell proliferation.
  • Sustained normal blood glucose levels were observed two weeks post-treatment withdrawal due to prolonged islet cell recovery.

Conclusions:

  • Truncating GLP-1 at the C-terminus (to the 32nd amino acid) yields a more effective analog for long-term type 2 diabetes management.
  • The C-terminus of GLP-1 plays a role in its in vivo clearance, potentially involving glucagon family clearance receptors.
  • sGLP-1 offers a promising therapeutic strategy by improving islet cell function and long-term glycemic control.