Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
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p38 Mitogen-Activated Protein Kinase is Involved in Endoplasmic Reticulum Stress-Induced Cell Death and Autophagy in Human Gingival Fibroblasts
Do-Sung KimJung-Hoon KimGeum-Hwa LeeHyung-Tae KimJung Min LimSoo-Wan ChaeHan-Jung ChaeHyung-Ryong Kim
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2010 Volume 33 Issue 4 Pages 545-549

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Abstract

Inflammation or hypoxia in gingival tissue can induce endoplasmic reticulum (ER) stress, which is related with autophagy. The autophagy is a catabolic process involving the degradation of a cell's own components. Although autophagy resulting in the total destruction of the cell is one of cell death types, no conclusive evidence exists for such a process. In order to examine the association of ER stress and autophagy in gingival system, ER stress agents brefeldin A, thapsigargin, and tunicamycin were exposed to human gingival cells. The ER stress agents induced cell death and the expression of ER stress proteins, glucose-regulated protein of 78 kDa (GRP78) and CCAAT/enhancer-binding protein (C/EBP) homologous protein (CHOP). ER stress also increased the formation of autophagic vesicles with the expression of beclin and LC-3 (microtubule-associated protein1 light chain 3) II, two autophagic markers. ER stress induced the phosphorylation of p38MAPK (mitogen-activated protein kinase), and the p38MPAK inhibitor, SB203580, inhibited the resulting cell death and autophagy. In summary, ER stress induces cell death and autophagy through p38MAPK in human gingival cells.

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© 2010 The Pharmaceutical Society of Japan
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