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Keratinocyte growth factor and keratin gene regulation.

Abstract：

:Keratinocyte growth factor (KGF) is a stromally derived paracrine mitogen that belongs to the fibroblast growth factor (FGF) family. It is secreted by dermal fibroblasts and specifically promotes keratinocyte proliferation. We have recently shown that epidermal growth factor (EGF) and transforming growth factor beta (TGF beta), modulators of keratinocyte proliferation, regulate expression of specific keratin genes. However KGF, unlike EGF and TGF beta, allows keratinocytes to differentiate normally. With this in mind, we sought to determine whether KGF may be involved in keratinocyte differentiation through a mechanism that does not involve regulation of keratin gene expression. We transfected human epidermal keratinocytes with ten different keratin gene promoters linked to a reporter gene, and grew the transfected cells in the presence or absence of KGF. Interestingly, no significant change in keratin gene regulation was observed in the presence of KGF relative to control. The possibility that KGF influences the induction of keratin gene expression by other keratinocyte modulators, such as EGF, TGF beta and gamma interferon (IFN gamma), was also explored. In these experiments, the transformed keratinocytes were exposed simultaneously to KGF and another modulator. KGF did not significantly change the effects of EGF, TGF beta or IFN gamma on keratin gene expression. KGF's lack of ability to directly regulate keratin gene expression suggests that KGF affects keratinocyte growth and differentiation through a pathway independent of keratin gene regulation. These results illustrate that regulation of keratinocyte proliferation can be separated from the regulation of keratin gene expression.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Dermatol Sci

journal_title

Journal of dermatological science

authors

Latkowski JM,Freedberg IM,Blumenberg M

doi

10.1016/0923-1811(94)00350-n

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

36-44

issue

1

eissn

0923-1811

issn

1873-569X

pii

092318119400350N

journal_volume

9

pub_type

杂志文章

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