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Exogenous IGF-1 promotes hair growth by stimulating cell proliferation and down regulating TGF-β1 in C57BL/6 mice in vivo.
Li J, et al. Growth Horm IGF Res. 2014 Apr-Jun.
Abstract
OBJECTIVE: Insulin-like growth factor 1 (IGF-1) increases the growth of cultured hair follicles and plays a role in regulating hair migration during the development of hair follicles in transgenic mice. However, the exogenous effect of IGF-1 on hair growth 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.
Li J, et al. Growth Horm IGF Res. 2014 Apr-Jun.
Abstract
OBJECTIVE: Insulin-like growth factor 1 (IGF-1) increases the growth of cultured hair follicles and plays a role in regulating hair migration during the development of hair follicles in transgenic mice. However, the exogenous effect of IGF-1 on hair growth 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.