Article

H2O2 accumulation by catalase reduction changes MAP kinase signaling in aged human skin in vivo.

Department of Dermatology, Laboratory of Cutaneous Agining Research, Clinical Research Institute, Seoul National University College of Medicine, Seoul, Korea.
Journal of Investigative Dermatology (impact factor: 6.31). 09/2005; 125(2):221-9. DOI:10.1111/j.0022-202X.2005.23823.x
Source: PubMed

ABSTRACT To understand the molecular alterations occurring during the aging process, we compared mitogen-activated protein (MAP) kinase activities in the intrinsically aged and photoaged skins in the same individuals. Furthermore, we investigated the molecular events related to MAP kinase changes in intrinsically aged and photoaged skins. We found that extracellular-signal-regulated kinase (ERK) activity in photoaged skin was reduced, and that the activities of c-Jun N-terminal kinase (JNK) and p38 kinase were increased compared with intrinsically aged skin in the same individuals. Phospho-c-Jun levels and activator protein 1 activities in photoaged skin were also higher than in intrinsically aged skin. Moreover, catalase activity was found to be much reduced in primary dermal fibroblasts from photoaged skin, and as a result, H2O2 accumulated more in primary dermal fibroblasts in photoaged skin. In addition, treating primary dermal fibroblasts from photoaged skin with catalase reduced H2O2 levels, reversed aging-dependent MAP kinase changes, and inhibited matrix metalloproteinase (MMP)-1 expression. Our results indicate that the accumulation of reactive oxygen species due to catalase attenuation may be a critical aspect of the MAP kinase signaling changes that may lead to skin aging and photoaging in human skin in vivo. Thus, the induction and regulation of endogenous antioxidant enzymes including catalase may offer a strategy for preventing and treating skin aging.

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Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

activator protein 1 activities
 
aging-dependent MAP kinase changes
 
c-Jun N-terminal kinase
 
catalase attenuation
 
endogenous antioxidant enzymes
 
extracellular-signal-regulated kinase
 
H2O2 levels
 
human skin
 
inhibited matrix metalloproteinase
 
MAP kinase changes
 
MAP kinase signaling changes
 
mitogen-activated protein
 
MMP)-1 expression
 
molecular alterations
 
p38 kinase
 
Phospho-c-Jun levels
 
photoaged skin
 
photoaged skins
 
primary dermal fibroblasts
 
reactive oxygen species