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Journal of the Society for Gynecologic Investigation, Vol. 8, No. 4, 233-238 (2001)
DOI: 10.1177/107155760100800408

Salmon GnRH and Its Analogues Bind the Human Placental Receptor

Theresa M. Siler-Khodr, PhD

Department of Obstetrics & Gynecology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, Room 416E, San Antonio, TX 78284 silerkhodr{at}uthscsa.edu

Marcia Grayson, MA

Department of Obstetrics & Gynecology, The University of Texas Health Science Centre at San Antomio, San Antonio, Texas

Objective: The presence of GnRH receptors in the human placenta has been recognized for a number of years. However, mammalian GnRH, which is expressed in placental tissues, has limited affinity for the chorionic receptor. On the basis of immunological and bioactivity data, we have previously proposed that the chorionic GnRH may differ from mammalian GnRH.

Results: Using our receptor assay method with the labeled mammalian GnRH analogue Buserelin, salmon GnRH had a twofold greater affinity for the placental GnRH receptor than did mammalian GnRH and for the stable salmon GnRH analogue the affinity was increased tenfold. Using a homologous receptor assay method with a stable salmon GnRH analogue as label, the affinity for this salmon GnRH analogue had a Kd of 101 nmol/L.

Conclusion: The presence of these higher affinity receptors for non-mammalian GnRH in the human placenta has led us to propose that the chorionic tissues may express more than one isoform of GnRH and that non-mammalian GnRH, such as salmon GnRH, may be potent regulators of a placental functions.

Key Words: Placenta • receptor • salmon GnRH • mammalian GnRH • lamprey I GnRH


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