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Involvement of p38 mitogen-activated protein kinase in E. coli-induced U937 apoptosis

Jia-He Wang1, Yi-Jun Zhou, Ping He

  • 1Department of Geriatrics, Second Affiliated Hospital, China Medical University, Shenyang 110004.

Chinese Medical Sciences Journal = Chung-Kuo I Hsueh K'O Hsueh Tsa Chih
|April 20, 2007
PubMed
Abstract

Insights

Escherichia coli (E. coli) triggers apoptosis in U937 cells through p38 mitogen-activated protein kinase (MAPK) activation. Inhibiting p38 MAPK significantly reduces this E. coli-induced cell death.

Area of Science:

  • Cell biology
  • Immunology
  • Microbiology

Background:

  • Apoptosis is a critical cellular process involved in development and disease.
  • Understanding the molecular mechanisms of bacterial-induced apoptosis is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To determine if p38 mitogen-activated protein kinase (MAPK) activation mediates Escherichia coli (E. coli)-induced apoptosis in U937 cell lines.

Main Methods:

  • U937 cell lines were exposed to E. coli with or without the p38 inhibitor SB203580.
  • Apoptosis was quantified using flow cytometry.
  • p38 activation was assessed by Western blotting to detect phosphorylated p38.

Main Results:

  • E. coli induced apoptosis in U937 cells in a time-dependent manner.
  • p38 phosphorylation increased rapidly after E. coli infection, peaking at 20 minutes, while total p38 levels remained constant.
  • SB203580 treatment significantly suppressed E. coli-induced apoptosis.

Conclusions:

  • p38 MAPK activation is a key pathway by which E. coli induces apoptosis in U937 cells.
  • Targeting the p38 MAPK pathway may offer a therapeutic approach to mitigate E. coli-induced cell death.

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