Exogenous IGF-1 promotes hair growth by stimulating cell proliferation and down regulating TGF-β1 in C57BL/6 mice in vivo.
Abstract
OBJECTIVE:
Insulin-like growth factor 1 (IGF-1) increases the growth of cultured hair follicles and plays a role in regulatinghair migration during the development of hair follicles in transgenic mice. However, the exogenous effect of IGF-1 on hairgrowth in wild-type mice has not been reported. In the present study, we examined whether IGF-1 was an important regulator of hair follicle growth in wide-type mice in vivo.
DESIGN:
C57BL/6 mice were injected with different concentrations of IGF-1 on dorsal skin. The treated tissues were analyzed by immunoassay methods for TGF-β1 and BrdU.
RESULTS:
Local injection of IGF-1 increased hair follicle number and prolonged the growing phase during the transition from anagen to telogen. Meanwhile, immunology analyses revealed that IGF-1 also stimulated the proliferation of follicle cells in anagen of the matrix and down regulated TGF-β1 expression in hair follicles.
CONCLUSIONS:
These observations suggest that IGF-1 is an effective stimulator of hair follicle development in wide-type mice in vivo and may be a promising drug candidate for baldness therapy.
Copyright © 2014. Published by Elsevier Ltd.
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