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Effect of PUVA on Nerve Growth Factor Expression in Cultured Keratinocytes  

Lee, Mu-Hyoung (Departments of Dermatology, College of Medicine, Kyunghee University)
Kim, Hwi-Jun (Departments of Dermatology, College of Medicine, Kyunghee University)
Lee, Jin-Woo (Departments of Immunology Research Laboratory, College of Medicine, Kyunghee University)
Kim, Young-Il (Departments of Immunology Research Laboratory, College of Medicine, Kyunghee University)
Publication Information
The Korean Journal of Physiology and Pharmacology / v.6, no.5, 2002 , pp. 275-279 More about this Journal
Abstract
Nerve growth factor (NGF) is an important autocrine growth factor and also a survival factor for keratinocytes. NGF may act in the hyperproliferative condition, psoriasis. Clinically, the combination of psoralen and UVA (PUVA) has been used in the treatment of a wide variety of cutaneous disorders, such as psoriasis and vitiligo. However, the precise therapeutic mechanism of PUVA on the dermatologic diseases remains unclear. The purpose of this study was to examine whether the expression of NGF in cultured keratinocytes is influenced by PUVA. Thus, normal human keratinocytes were isolated from neonatal foreskin, and the third to fifth-passaged cells were used in this study. The cells were exposed to various doses of UVA (30, 60, 120 $mJ/cm^2)$ after adding 8-methoxypsoralen (8-MOP) to examine the expression of NGF mRNA. The RNA and protein of the cells were extracted at various time points (1, 8, 24 hours) after UVA irradiation to examine the expression of NGF mRNA and production of NGF protein. In keratinocytes, there were no differences in the expression of NGF mRNA between the different doses of UVA irradiation, however, the expression of NGF mRNA in UVA and PUVA groups tended to increase as the time increased. The expression of NGF mRNA was the highest in PUVA group, followed by UVA group and the lowest in 8-MOP group. The expressions of NGF protein at 1 and 8 hours after UVA irradiation were lower in the PUVA group than in the other groups. This study showed that the expression level of NGF protein in keratinocytes was relatively lower in the PUVA groups than in the other groups, suggesting that the therapeutic mechanism of PUVA in psoriasis is related to the decrease of NGF protein.
Keywords
PUVA; NGF; Keratinocyte; Psoriasis;
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