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J. Biol. Chem., Vol. 277, Issue 35, 31283-31286, August 30, 2002
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From the Several orphan G protein-coupled receptors
homologous to gonadotropin and thyrotropin receptors have recently been
identified and named as LGR4-8. INSL3, also known as Leydig
insulin-like peptide or relaxin-like factor, is a relaxin family member
expressed in testis Leydig cells and ovarian theca and luteal cells.
Male mice mutant for INSL3 exhibit cryptorchidism or defects in testis descent due to abnormal gubernaculum development whereas overexpression of INSL3 induces ovary descent in transgenic females. Because transgenic mice missing the LGR8 gene are also cryptorchid, INSL3 was
tested as the ligand for LGR8. Here, we show that treatment with INSL3
stimulated cAMP production in cells expressing recombinant LGR8 but not
LGR7. In addition, interactions between INSL3 and LGR8 were
demonstrated following ligand receptor cross-linking. Northern blot
analysis indicated that the LGR8 transcripts are expressed in
gubernaculum whereas treatment of cultured gubernacular cells with
INSL3 stimulated cAMP production and thymidine incorporation. The
present study identified the ligand for an orphan G protein-coupled receptor based on common phenotypes of ligand and receptor null mice.
Demonstration of INSL3 as the ligand for LGR8 facilitates understanding
of the mechanism of testis descent and allows studies on the role of
INSL3 in gonadal and other physiological processes.
Division of Reproductive Biology, Department
of Gynecology and Obstetrics, Stanford University School of
Medicine, Stanford, California 94305-5317 and the § Howard
Florey Institute of Experimental Physiology and Medicine, University of
Melbourne, Victoria 3010, Australia
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