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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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Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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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...
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The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
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Exendin-4 improves β-cell function in autophagy-deficient β-cells.

Hiroko Abe1, Toyoyoshi Uchida, Akemi Hara

  • 1or Toyoyoshi Uchida, M.D., Ph.D., Department of Metabolism and Endocrinology, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan. hwatada@juntendo.ac.jp or uchitoyo@juntendo.ac.jp.

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Summary

Autophagy failure may contribute to type 2 diabetes. Exendin-4 improves glucose tolerance in mice with impaired autophagy by enhancing insulin secretion and promoting beta-cell survival, independent of autophagy modulation.

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Metabolic Diseases

Background:

  • Autophagy is crucial for pancreatic beta-cell function and mass.
  • Autophagy dysfunction in beta-cells is implicated in type 2 diabetes pathophysiology, but its precise role and therapeutic implications remain unclear.
  • Increased p62 expression observed in islets of db/db mice and type 2 diabetes patients suggests impaired autophagy.

Purpose of the Study:

  • To investigate the role of autophagy deficiency in beta-cell dysfunction in type 2 diabetes.
  • To evaluate the therapeutic potential of exendin-4, a GLP-1 receptor agonist, in the context of autophagy deficiency in beta-cells.
  • To elucidate the mechanisms by which exendin-4 exerts its effects on glucose homeostasis and beta-cell health.

Main Methods:

  • Utilized db/db mice and beta-cell-specific Atg7-deficient mice models.
  • Administered exendin-4 treatment to assess effects on glucose tolerance, blood glucose levels, and insulin secretion.
  • Analyzed p62 expression, beta-cell apoptosis, and proliferation in islets.
  • Investigated exendin-4's protective effects against thapsigargin-induced cell death in isolated islets.

Main Results:

  • Exendin-4 improved glucose tolerance in db/db mice without altering p62 expression.
  • In Atg7-deficient mice, exendin-4 enhanced blood glucose control and glucose tolerance primarily through increased insulin secretion.
  • Exendin-4 reduced apoptosis and increased proliferation in Atg7-deficient islets, counteracting cell death induced by autophagy deficiency.

Conclusions:

  • Reduced autophagy may contribute to beta-cell dysfunction in type 2 diabetes.
  • Exendin-4 effectively improves glucose tolerance in conditions of autophagy deficiency in beta-cells.
  • Exendin-4's beneficial effects are mediated by enhanced insulin secretion and promotion of beta-cell survival, independent of modulating the autophagic pathway.