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        Klotho : Expression and Regulation at the Maternal-Conceptus Interface in Pigs

        최요한,심장수,현상환,이은송,가학현 사단법인 한국동물생명공학회 2014 한국동물생명공학회지 Vol.29 No.4

        Klotho (KL) is a single transmembrane protein composed of KL1 and KL2 repeats possessing β-glucuronidaseactivity and maintains calcium homeostasis in physiological state. It has been implicated in pigs that calcium isimportant for the establishment and maintenance of pregnancy, and our previous study has shown that transient receptorpotential vanilloid type 6 (TRPV6), a calcium ion transporter, is predominantly expressed in the uterine endometriumduring pregnancy in pigs. However, expression and function of KL in the uterine endometrium has not been determinedin pigs. Thus, the present study determined expression and regulation of KL in the uterine endometrium during theestrous cycle and pregnancy in pigs. Real-time RT-PCR analysis showed that levels of KL mRNA decreased betweenDays 12 to 15 of the estrous cycle, and its expression showed a biphasic manner during pregnancy. KL mRNA wasexpressed in conceptuses and in chorioallantoic tissues during pregnancy. Explant culture study showed that expressionlevels of KL were not affected by treatment of steroid hormones or interleukin-1beta during the implantation period. Furthermore, levels of KL mRNA in the uterine endometrium from gilts carrying somatic cell nuclear transfer (SCNT)-derived embryos were significantly lower than those from gilts carrying natural mating-derived embryos on Day 12of pregnancy. These results exhibited that KL was expressed at the maternal-conceptus interface in a pregnancy statusandstage-specific manner, and its expression was affected by SCNT procedure, suggesting that KL may play animportant role in the establishment and maintenance of pregnancy in pigs.

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