成纤维细胞生长因子21及其受体1、2在小鼠毛囊形成期的定位和表达

本试验旨在通过研究成纤维细胞生长因子21(fibroblast growth factor 21,FGF21)及其受体FGFR1、FGFR2在胚胎小鼠毛囊形成阶段中的定位与表达,从而探究其在小鼠毛囊形成中的作用。试验采用免疫组织化学、实时荧光定量PCR及Western blotting方法研究FGF21、FGFR1、FGFR2蛋白和mRNA在胚胎期13～18d(E13～E18)小鼠皮肤中的表达。结果显示:(1)FGF21蛋白在E13主要表达于表层细胞、基底层细胞及结缔组织中,E14表达于表层细胞和基板,E15在毛芽中有微量表达,E16、E17表达于毛钉中,E18主要表达于未成熟毛囊细胞;FGFR1和FGFR2蛋白在E13～E18于表层细胞、基底层、基板、毛芽、毛钉、未成熟毛囊和结缔组织中均有表达。(2)实时荧光定量PCR及Western blotting结果显示:FGF21mRNA和蛋白在E14相对表达量最高;FGFR1mRNA及蛋白在E16～E17相对表达量较高;FGFR2mRNA及蛋白的相对表达量在E13至E18均呈上升趋势,在E18相对表达量最高。结果提示:在小鼠胚胎期毛囊形成和发育过程中,FGF21可能在诱导毛囊启动过程中发挥一定的作用;FGFR1可能促进毛钉形成;FGFR2可能在毛囊形成和成熟中发挥重要作用。

Localization and Expression of FGF21,FGFR1 and FGFR2 in Mice Hair Follicle Formation

This study had investigated the localization and expression of fibroblast growth factor 21 (FGF21) with its receptors FGFR1 and FGFR2 in the formation phase of embryonic mice hair follicles.E13-E18 embryonic mice back skin were used to determine the mRNA and protein relative expression levels of FGF21,FGFR1 and FGFR2 by immunohistochemistry,Real-time PCR and Western blotting analysis.The results showed that:①FGF21 expressed in epidermis,basal layer and connective tissue at E13;Expressed in epidermis and placode at E14;Slightly expressed in hair bud at E15;Expressed in hair peg at E16 and E17;Mainly expressed in immature hair follicle at E18.FGFR1 and FGFR2 expressed in epidermis,basal layer,placode,hair bud,hair peg,immature hair follicle and connective tissue at E13-E18.②The results of Real-time PCR and Western blotting showed that the relative expression levels of FGF21 mRNA and protein were higher at E14 than that of any other stages;The relative expression levels of FGFR1 mRNA and protein were higher at E16-E17;And the relative expression of FGFR2 mRNA and protein showed ascending trend from E13 to E18 and was highest at E18.In summary,during the embryonic hair follicle formation and development,FGF21 might play a role in inducing hair follicle activation;FGFR1 might promote hair peg formation;FGFR2 might be necessary to induce hair follicle formation and hair follicle maturation.