ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (2): 397-403.doi: 10.11843/j.issn.0366-6964.2016.02.025

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Fetal Skin Hair Follicle Morphogenesis and E-Cadherin Expression of the Yak

SHE Ping-chang1,2,LIANG Chun-nian1,2,PEI Jie1,2,CHU Min1,2,GUO Xian1,2,YAN Ping1,2*   

  1. (1.Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS,Lanzhou 730050,China;2.Key Laboratory of Yak Breeding Engineering of Gansu Province,Lanzhou 730050,China)
  • Received:2015-05-13 Online:2016-02-23 Published:2016-02-23

Abstract:

The objective of this study was to observe yak hair follicle morphogenesis and fetal hair follicle original sites,study the importance of E-cadherin (CDH1) in the development of hair follicles.Skin tissue sections of the Yak embryo head were observed,and the hair follicle morphogenesis was studied.The melanin granules of fetal skin at different month and the development of hair follicle original sites were detected.The expression of E-cadherin protein was analyzed by using immunohistochemistry.The mRNA transcription levels of E-cadherin gene in different month fetal head skin was tested by using qRT-PCR method.Results showed that the fetal head skin begins to form primary hair buds in embryonic age of 60-70 days,and form the hair bulbs structure in the embryonic age of 130 days.Secondary hair follicles differentiate out from primary hair follicles in gestational age of 80-90 days;The parts of the fetal skin melanin gathering situations in different periods were observed,the hair follicles differentiation was started from head,of which lower,eyebrows,eyelashes,and horn site were the most obvious;E-cadherin protein was located on the epidermis,dermis and hair follicles,and showed high expression in epidermis,and moderate positive expression in hair follicles.E-cadherin gene mRNA transcription were uptrend in different embryonic age of yak skin hair follicle,but was lower at the embryonic age of 90 days,it was obviously below those at 70 days,120 days and 130 days (P<0.05).Yak head hair follicle is developed in the embryonic age of 60-70 days to form hair buds,and hair follicle development is likely forms from head.E-cadherin gene is most likely involved in the development of yak hair follicles.

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