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POSSIBLE ROLE OF METALLOTHIONEIN IN THE CELLULARDEFENSE MECHANISM AGAINST UVB IRRADIATION IN NEONATAL HUMAN SKIN FIBROBLASTS
Author(s) -
Kobayashi Shizuko,
Hirota Yumiko,
SayatoSuzuki Junko,
Takehana Makoto,
Nishimura Hisao,
Nishimura Noriko,
Tohyama Chiharu
Publication year - 1994
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1994.tb08233.x
Subject(s) - glutathione , human skin , metallothionein , keratinocyte , microbiology and biotechnology , irradiation , endogeny , fibroblast , chemistry , dermal fibroblast , biology , in vitro , biochemistry , enzyme , genetics , physics , gene , nuclear physics
Abstract –The role of metallothionein (MT) in protecting skin cells against UVB irradiation was investigated. Fibroblast strains from normal adult (HS‐K) and neonatal (NB1RGB) human skins as well as keratinocyte strains from human skin (SV40‐HSK) and newborn Balb/c mouse skin (Pam 212) were exposed to UVB irradiation. The sensitivity of HS‐K and NB1RGB cells to UVB irradiation was similar; those of SV40‐HSK and Pam 212 cells were two‐ and six‐fold as sensitive to UVB irradiation as HS‐K cells, respectively. The HS‐K cells contained the greatest cellular reduced form of glutathione (GSH) levels compared to the three other skin cells: the levels were 13‐, 7‐ and 6‐fold of those in NB1RGB, SV40‐HSK and Pam 212 cells, respectively. These results indicated that the sensitivity of skin cells to UVB irradiation was not always associated with their endogenous GSH levels. In particular, despite the fact that NB1 RGB cells contained a relatively small amount of GSH, they were less sensitive to UVB irradiation. NB1RGB cells contained 4–30 times more MT than those in other skin cells examined. The sulfhydryl residues of MT molecules in the NB1RGB cells were estimated to be mostly unoccupied by metals, suggesting they act in a similar way to those of GSH. Moreover, NB1RGB cells in which the MT content was elevated by dexamethasone (1 μg/mL ) or Zn 2+ (7 μg/mL) treatment were more resistant to UVB irradiation than nontreated ones. These results suggest that, at least in neonatal human skin fibroblasts, MT may play a role in protection against UVB irradiation.