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. 1995 Feb 28;92(5):1322–1326. doi: 10.1073/pnas.92.5.1322

Targeted overexpression of luteinizing hormone in transgenic mice leads to infertility, polycystic ovaries, and ovarian tumors.

K A Risma 1, C M Clay 1, T M Nett 1, T Wagner 1, J Yun 1, J H Nilson 1
PMCID: PMC42511  PMID: 7877975

Abstract

Hypersecretion of luteinizing hormone (LH) is implicated in infertility and miscarriages in women. A lack of animal models has limited progress in determining the mechanisms of LH toxicity. We have recently generated transgenic mice expressing a chimeric LH beta subunit (LH beta) in gonadotropes. The LH beta chimera contains the C-terminal peptide of the human chorionic gonadotropin beta subunit. Addition of this peptide to bovine LH beta resulted in a hormone with a longer half-life. Furthermore, targeted expression of the LH beta chimera led to elevated LH levels and infertility in female transgenics. These mice ovulated infrequently, maintained a prolonged luteal phase, and developed pathologic ovarian changes such as cyst formation, marked enlargement of ovaries, and granulosa cell tumors. Testosterone and estradiol levels were increased compared to nontransgenic littermates. An unusual extragonadal phenotype was also observed: transgenic females developed hydronephropathy and pyelonephritis. The pathology observed demonstrates a direct association between abnormal secretion of LH and infertility and underscores the utility of the transgenic model for studying how excess LH leads to cyst formation, ovarian tumorigenesis, and infertility.

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Selected References

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