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      Physiological Roles of Integrin α 6β 1 in Ovarian Functions

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          We previously reported that human ovarian cells express integrin β<sub>1</sub> families. The physiological role(s) of integrins was investigated using in vitro human granulosa cell culture and in vivo mouse ovulation model. In human luteinizing granulosa cell culture obtained from the patients undergoing in vitro fertilization treatment, laminin, which is a ligand for integrin α<sub>6</sub>β<sub>1</sub>, suppressed the production of progesterone by granulosa cells. On the other hand, the anti-α<sub>6</sub> monoclonal antibody (mAb) GoH3, which partially inhibits the interaction between integrin α<sub>6</sub>β<sub>1</sub> and laminin, enhanced production of progesterone by 2-fold of the control under the culture with laminin, indicating that integrin α<sub>6</sub>β<sub>1</sub> regulates the luteinization of human granulosa cell during the periovulatory phase. In an immature superovulated 13-day-old ICR (CD-1) mice model, intraperitoneal administration of GoH3 induced successful ovulation, whereas no ovulation was observed in the GoH3-nontreated groups, showing that integrin α<sub>6</sub>β<sub>1</sub> is related to gonadotropin-induced follicular growth. These findings suggest that the interaction between integrin α<sub>6</sub>β<sub>1</sub> and laminin plays an important role in the corpus luteum formation and follicular growth.

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          Author and article information

          Horm Res Paediatr
          Hormone Research in Paediatrics
          S. Karger AG
          July 1998
          17 November 2004
          : 50
          : Suppl 2
          : 25-29
          a Department of Gynecology and Obstetrics, Faculty of Medicine, b Virus Research Institute, c Chest Disease Research Institute, Kyoto University, d Kyoto National Hospital, Kyoto, and e Department of Obstetrics and Gynecology, Kobe City General Hospital, Kobe, Japan
          53120 Horm Res 1998;50(suppl 2):25–29
          © 1998 S. Karger AG, Basel

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          Page count
          Pages: 5


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