ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (3): 534-543.doi: 10.11843/j.issn.0366-6964.2019.03.008

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Expression of FGF21 and Receptors FGFR1, FGFR2 in the First Hair Follicle Growth Cycle of Mice

WU Jinqiang, CAO Xiaorui, YAN Ruiqin, LU Na, ZHANG Jiaojiao, WU Jiahao, HE Xiaoyan*   

  1. College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, China
  • Received:2018-07-09 Online:2019-03-23 Published:2019-03-23

Abstract:

To explore the role of FGF21 and receptors FGFR1, FGFR 2 in hair follicle development, we researched the localization and expression of FGF21 and receptors FGFR1, FGFR2 in the first hair follicle growth cycle of mice. The immunohistochemistry, real-time PCR and Western blot were used to study the expression of FGF21 and receptors FGFR1, FGFR2 mRNA and proteins in mice back skin on 1, 3, 5, 8, 12, 17, 21, 23 days old. The results showed that during the first hair follicle growth cycle of mice, FGF21 was mainly expressed in dermal papilla, matrix cells, inner and outer root sheaths and connective tissue around hair follicles; FGFR1 was located in various structures of hair follicle, and abundantly expressed in the inner and outer root sheaths in the catagen(12-17 days old) and telogen(18-21 days old); FGFR2 was abundantly located in various structures of hair follicle. The expression levels of FGF21 mRNA at 1, 3, 5, 8, 12 and 17 days old were significantly lower than at 23 days old(P<0.01), and the expression at 21 days old was lower than at 23 days old, the difference was not significant(P>0.05); The expression levels of FGF21 protein were higher at 1-5 days and 23 days old. The expression levels of FGFR1 mRNA at 1, 3, 5, 8, 12, 21 and 23 days old were significantly lower than at 17 days old(P<0.01); The expression levels of FGFR1 protein increased from 12 days old, reached the highest at 17 days old, and then decreased. The expression levels of FGFR2 mRNA at 1, 5, 8, 12, 21 and 23 days old were significantly lower than at 17 days old(P<0.01), and the expression at 3 days old was lower than at 17 days old, the difference was not significant(P>0.05); FGFR2 protein was highly expressed at 1-17 days old. The results showed that during the first hair follicle growth cycle of mice, FGF21 plays an important role in the proliferation and differentiation of fibroblasts involved in hair follicle formation, and induces hair follicles to enter the catagen from the anagen. FGFR1 plays an important role in the proliferation and differentiation of inner and outer root sheath cells, and induces hair follicles to enter the telogen from the catagen. FGFR2 plays an important role in cell proliferation and differentiation in hair follicles, and induces hair follicles to enter the telogen from the anagen and catagen.

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