Abstract
β-Catenin is involved in the hair follicle morphogenesis and stem cell differentiation, and inhibition of glycogen synthase kinase-3 (GSK-3) increases β-catenin concentration in the cytoplasm. To examine the effects of GSK-3 inhibition on the hair follicle epithelium, we first examined the expression of GSK-3 in plucked human hair follicles by RT-PCR and found GSK-3 expression in hair follicles. Western blotting with a GSK-3β-specific antibody, Y174, also demonstrated GSK-3β expression in the follicles. Moreover, GSK-3β immunostaining with Y174 showed that GSK-3β colocalized with hair follicle bulge markers. Contrary to GSK-3β, GSK-3α was widely expressed throughout the follicles when immunostained with a specific antibody, EP793Y. We then investigated the influence of GSK-3 inhibition. A GSK-3 inhibitor, BIO, promoted the growth of human outer root sheath cells, which could be cultured for up to four passages. The BIO-treated cells exhibited smaller and more undifferentiated morphology than control cells. Moreover, in organ culture of plucked human hair, outer root sheath cells in the middle of a hair follicle proliferated when cultured with BIO. These results indicate that GSK-3β is expressed in hair bulge stem cells and BIO promotes the growth of ORS cells, possibly by regulating the GSK-3 signaling pathway.
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Abbreviations
- BIO:
-
(2′Z, 3′E)-6-Bromoindirubin-3′-oxime
- CK:
-
Cytokeratin
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- DP:
-
Dermal papilla
- FBS:
-
Fetal bovine serum
- GSK-3:
-
Glycogen synthase kinase-3
- HF:
-
Hair follicle
- ORS:
-
Outer root sheath
- SCs:
-
Stem cells
- TA:
-
Transit amplifying
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Yamauchi, K., Kurosaka, A. Expression and function of glycogen synthase kinase-3 in human hair follicles. Arch Dermatol Res 302, 263–270 (2010). https://doi.org/10.1007/s00403-009-0987-x
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DOI: https://doi.org/10.1007/s00403-009-0987-x