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Hepatocyte growth factor/scatter factor (HGF/SF) is a multifunctional polypeptide which acts as mitogen, motogen, or morphogen. In this study, we examined the effect of HGF/SF on human hair growth using organ and cell culture systems. HGF/SF was found to stimulate hair length and DNA synthesis in hair follicles at increasing concentrations up to 10 ng/ml (P < 0.05 and P < 0.01, respectively). HGF/SF stimulated [3H]thymidine incorporation by hair bulb-derived keratinocytes with the strongest response at 30 ng/ml of HGF/SF (P < 0.05). Cultured follicular papilla cells secreted HGF/SF, measured by an enzyme-linked immunoassay, in response to interleukin 1-alpha (IL1-alpha, 10 ng/ml), tumor necrosis factor-alpha (TNF-alpha, 10 ng/ml), or tetradecanoylphorbolacetate (100 nM) at levels ranging from 0.2 to 0.3 ng/mg protein/48 h. HGF/SF mRNA expressions, measured by the reverse transcription-polymerase chain reaction, were detected in follicular papilla cells, and were also stimulated by the three reagents. Transforming growth factor-beta (10 ng/ml) suppressed both protein and mRNA levels. These results suggest that hair follicle elongation induced by HGF/SF in organ culture occurs partly due to the mitogenic activity of HGF/SF expressed in follicular papilla cells on hair bulb-derived keratinocytes.
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