4.5 Article

The Luteinizing Hormone Receptor Knockout Mouse as a Tool to Probe the In Vivo Actions of Gonadotropic Hormones/Receptors in Females

期刊

ENDOCRINOLOGY
卷 162, 期 5, 页码 -

出版社

ENDOCRINE SOC
DOI: 10.1210/endocr/bqab035

关键词

gonadotropin hormones; reproduction; luteinizing hormone; follicle-stimulating hormone; G protein-coupled receptors

资金

  1. Biotechnology and Biological Sciences Research Council [BB/1008004/1]
  2. Wellcome Trust [082101/Z/07/Z]
  3. Wellcome Trust [082101/Z/07/Z] Funding Source: Wellcome Trust

向作者/读者索取更多资源

Mouse models with altered gonadotropin functions have provided insight into the essential role of functional LHR and FSHR in mediating ovarian functions. The repurposing of genetically modified mouse models offers potential for answering outstanding questions in reproductive physiology.
Mouse models with altered gonadotropin functions have provided invaluable insight into the functions of these hormones/receptors. Here we describe the repurposing of the infertile and hypogonadal luteinizing hormone receptor (LHR) knockout mouse model (LuRKO), to address outstanding questions in reproductive physiology. Using crossbreeding strategies and physiological and histological analyses, we first addressed the physiological relevance of forced LHR homomerization in female mice using BAC expression of 2 ligand-binding and signaling deficient mutant LHR, respectively, that have previously shown to undergo functional complementation and rescue the hypogonadal phenotype of male LuRKO mice. In female LuRKO mice, coexpression of signaling and binding deficient LHR mutants failed to rescue the hypogonadal and anovulatory phenotype. This was apparently due to the low-level expression of the 2 mutant LHR and potential lack of luteinizing hormone (LH)/LHR-dependent pleiotropic signaling that has previously been shown at high receptor densities to be essential for ovulation. Next, we utilized a mouse model overexpressing human chorionic gonadotropin (hCG) with increased circulating LH/hCG-like bioactivity to similar to 40 fold higher than WT females, to determine if high circulating hCG in the LuRKO background could reveal putative LHR-independent actions. No effects were found, thus, suggesting that LH/hCG mediate their gonadal and non-gonadal effects solely via LHR. Finally, targeted expression of a constitutively active follicle stimulating hormone receptor (FSHR) progressed antral follicles to preovulatory follicles and displayed phenotypic markers of enhanced estrogenic activity but failed to induce ovulation in LuRKO mice. This study highlights the critical importance and precise control of functional LHR and FSHR for mediating ovarian functions and of the potential repurposing of existing genetically modified mouse models in answering outstanding questions in reproductive physiology.

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