Control of the autophagy maturation step by the MAPK ERK and p38: lessons from environmental carcinogens
- PMID:17102581
- DOI: 10.4161/auto.3424
Control of the autophagy maturation step by the MAPK ERK and p38: lessons from environmental carcinogens
Abstract
Macroautophagy (hereafter referred to as autophagy) is the major degradative pathway of long-lived proteins and organelles that fulfils key functions in cell survival, tissue remodeling and tumor suppression. Consistently, alterations in autophagy have been involved in a growing list of pathologies including toxic injury, infections, neurodegeneration, myopathies and cancers. Although critical, the molecular mechanisms that control autophagy remain largely unknown. We have recently exploited the disruption of autophagy by environmental carcinogens as a powerful model to uncover the underlying signaling pathways. Our work published in Cancer Research revealed that the sustained activation of the MAPK ERK pathway by the carcinogen Lindane or the MEK1(+) oncogene alters autophagy selectively at the maturation step resulting in the accumulation of large defective autolysosomes. Consistent with our findings, a similar defect is observed with other common xenobiotics such as dichlorodiphenyltrichloroethane and biphenol A that specifically activate ERK. Conversely, Pentachlorophenol that activates both ERK and p38, fails to induce autophagic vacuolation. In addition, evidence is provided that abrogation of p38 by SB203580 is sufficient to interfere with the normal autophagic maturation step. Altogether, these findings underscore the critical role played by MAPK ERK and p38 in the tight control of the autophagy process at the maturation step.
Comment on
- Disruption of autophagy at the maturation step by the carcinogen lindane is associated with the sustained mitogen-activated protein kinase/extracellular signal-regulated kinase activity.Corcelle E, Nebout M, Bekri S, Gauthier N, Hofman P, Poujeol P, Fénichel P, Mograbi B.Corcelle E, et al.Cancer Res. 2006 Jul 1;66(13):6861-70. doi: 10.1158/0008-5472.CAN-05-3557.Cancer Res. 2006.PMID:16818664
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