| Autor: |
Prost, O., Nicollier, M., Laurent, R., Adessi, G. |
| Zdroj: |
Archives of Dermatological Research; May1985, Vol. 277 Issue 3, p195-200, 6p |
| Abstrakt: |
Estrone (E)-sulfatase and dehydroepiandrosterone (DHEA)-sulfatase activities were studied in human female epidermis. Skin specimens were obtained by abdominal or plantar biopsies. The apparent Michaelis-Menten constants for E and DHEA sulfatase were 35.2 μM and 8.7 μM, respectively. A substrate inhibition was only observed for DHEA sulfatase. Both sulfatases had an elevated temperature optimum (65°C). The effect of inorganic salts was also tested. In normal epidermis, E-sulfatase activity was constantly higher than DHEA-sulfatase activity, but no correlation between these activities was observed. On the other hand, E-and DHEA-sulfatase activities were lower in plantar than in abdominal epidermis. In plantar epidermis of palmoplantar keratoderma, large variations in E-sulfatase activity, but no significant variation in DHEA-sulfatase activity, were obseved. In human epidermis, the findings were consistent with the existence of two different sulfatases: E sulfatase and DHEA sulfatase. It would also appear that sulfatase activities are not linked to the abnormal shedding of plantar stratum corneum in palmoplantar keratoderma. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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