title: [Circadian clock gene Rev-erb-α deficiency prolongs female estrous cyclicity].
abstract: The circadian clock has been linked to female reproductive physiology and endocrine in mammals. Epidemiological studies of female shift workers have shown increased rates of abnormal reproduction and adverse pregnancy. But little is known how the circadian rhythms affect reproduction. The aim of the present study was to investigate the influences of circadian rhythms on estrous cycle in female mice using clock gene Rev-erb-α knock out (Rev-erb-α(-/-)) mice. To test the fertility of Rev-erb-α(-/-) mice, litter sizes were counted after mating with C57BL/6J male mice. HE staining was used to observe the change of follicle development. The number of embryos of Rev-erb-α(+/+) and Rev-erb-α(-/-) female mice was compared 1.5 d after mating with C57BL/6J male mice. Then Rev-erb-α(+/+) and Rev-erb-α(-/-) female mice were housed to adult, and daily vaginal lavage with 0.9% saline was used to monitor estrous cycle for at least 30 days. Quantity of various cells was counted on specified smears views after staining. We observed estrous cycles of Rev-erb-α(+/+) and Rev-erb-α(-/-) female mice using line plots and periodic spectrograms. The results showed that the Rev-erb-α(-/-) female mice were infertility, and the number of embryos of Rev-erb-α(-/-) females was less than that of Rev-erb-α(+/+) females. However, the follicle development of Rev-erb-α(-/-) female mice was normal. The estrous cycle of Rev-erb-α(-/-) female mice was 3.22 days longer than that of Rev-erb-α(+/+) female mice. The results suggest that loss of Rev-erb-α prolongs estrous cycle, which is probably one of the reasons for female mice infertility, and circadian rhythm is important for mammalian estrous cycle.
authors: Zhejiang Province Key Laboratory of Biotechnology and Application Mode, Wenzhou Medical University, Wenzhou 325035, China; MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing University, Nanjing 210061, China; Center for Systems Biology, Soochow University, Suzhou 215006, China. E-mail: jimingao64@163.com.
authors: Qin
authors: Q
authors: Zhang
authors: Zhen
authors: Z
authors: Dong
authors: Xi
authors: X
authors: Wu
authors: Jie
authors: J
authors: Yan
authors: Ji-Min
authors: JM
authors: Gao
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D030762:Estrous Cycle; D005260:Female; D005298:Fertility; D008098:Litter Size; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D056953:Nuclear Receptor Subfamily 1, Group D, Member 1 / Q000235:genetics / Q000502:physiology*; D011247:Pregnancy
chemical_list: C498262:Nr1d1 protein, mouse; D056953:Nuclear Receptor Subfamily 1, Group D, Member 1