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GLP-1 Analogue, Exendin-4, Modulates MAPKs Activity but not the Heat Shock Response in Human HepG2 Cells

Dhanya Madhu1, Maha Hammad1, Sina Kavalakatt1

  • 1Research Division, Functional Proteomics and Metabolomics Unit, Dasman Diabetes Institute, Kuwait City, Kuwait.

Proteomics. Clinical Applications
|November 7, 2017
PubMed
Abstract

Insights

Glucagon-like peptide-1 (GLP-1) analogue exendin-4 modulates mitogen-activated protein kinases (MAPKs) and other signaling pathways in liver cells. This research reveals new insights into GLP-1

Area of Science:

  • Cellular and Molecular Biology
  • Metabolic Research
  • Pharmacology

Background:

  • Glucagon-like peptide-1 (GLP-1) analogues are known to reduce endoplasmic reticulum (ER) stress and inflammation in metabolic organs like the liver.
  • The impact of GLP-1 analogues on the heat shock response (HSR) and mitogen-activated protein kinases (MAPKs) remains largely unexplored.

Purpose of the Study:

  • To investigate the effects of the GLP-1 analogue exendin-4 on the heat shock response (HSR) and mitogen-activated protein kinase (MAPK) activity in liver cells under metabolic stress.
  • To explore novel signaling pathways influenced by exendin-4 beyond its established role in glycemic control.

Main Methods:

  • Utilized HepG2 liver cell line exposed to exendin-4 alone or in combination with palmitic acid (PA) or glucose.
  • Employed Western blotting, quantitative real-time PCR, and label-free proteomics to assess protein expression and phosphorylation.
  • Analyzed the modulation of heat shock proteins (HSPs) and MAPK signaling pathways.

Main Results:

  • Exendin-4 alone increased MAPK phosphorylation (JNK, ERK1/2, p38) but did not significantly alter heat shock protein levels.
  • Exendin-4 attenuated MAPK phosphorylation after 24-hour incubation with PA or glucose.
  • Canonical signaling pathways including EIF2, ILK, PKA, and Rho were modulated by exendin-4.

Conclusions:

  • Exendin-4 influences MAPK activity and other signaling pathways in liver cells, suggesting broader therapeutic potential for GLP-1 analogues.
  • These findings contribute to understanding the multifaceted benefits of GLP-1 analogues in metabolic regulation, energy homeostasis, and weight management.
Keywords:
GLP-1HSPMAPKscellular stressdiabetes

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