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Expression and Regulation of Pituitary Adenylate Cyclase-Activating Polypeptide in Rat Placental Cells

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Abstract

Pituitary adenylate cyclase-activating polypeptide (PACAP) was first identified as a hypophysiotropic factor that regulates pituitary cell functions and has been subsequently shown to be widely distributed and have multiple functions. The PACAP is known to be expressed in placental tissues and is suggested to have a critical role in physiological function of the placenta. In addition to PACAP, the hypothalamic peptides kisspeptin and gonadotropin-releasing hormone (GnRH) are also expressed in placental cells. In this study, we used primary cultures of placental tissues from rats of 16 to 18 days gestation and examined the regulation and function of PACAP. The PACAP messenger RNA (mRNA) expression and PACAP-immunoreactive cells were detected in primary cultures of rat placental cells. The PACAP mRNA expression in placental cells was upregulated in the presence of the sex steroids estradiol and progesterone; however, their combined treatment failed to enhance their individual effects. When the cells were stimulated with kisspeptin, PACAP mRNA expression was increased. Similarly, GnRH had a stimulatory effect on PACAP expression. Conversely, kisspeptin expression in placental cells was increased by PACAP stimulation, whereas PACAP failed to stimulate GnRH mRNA expression in these cells. Finally, we found that PACAP had a stimulatory effect on human chorionic gonadotropin expression in placental cells. Our current observations suggest that the hypothalamic peptides PACAP, kisspeptin, and GnRH are interrelated and maintain placental functions.

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Authors and Affiliations

  1. Department of Obstetrics and Gynecology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, 693-8501, Izumo, Shimane, Japan

    Aki Oride MD, Haruhiko Kanasaki MD, Tselmeg Mijiddorj MD, Unurjargal Sukhbaatar MD & Satoru Kyo MD

  2. Department of Experimental Animals, Interdisciplinary Center for Science Research, Organization for Research, Shimane University, Shimane, Japan

    Takaya Yamada PhD

Authors
  1. Aki Oride MD
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  2. Haruhiko Kanasaki MD
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  3. Tselmeg Mijiddorj MD
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  6. Satoru Kyo MD
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Correspondence to Haruhiko Kanasaki MD.

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Oride, A., Kanasaki, H., Mijiddorj, T. et al. Expression and Regulation of Pituitary Adenylate Cyclase-Activating Polypeptide in Rat Placental Cells. Reprod. Sci. 23, 1080–1086 (2016). https://doi.org/10.1177/1933719116630421

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