Impairment of spermatogenesis in mice lacking a functional aromatase (cyp 19) gene

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Impairment of spermatogenesis in mice lacking a functional aromatase (cyp 19) gene.

It is well established that spermatogenesis is controlled by gonadotrophins and testosterone. However, a role for estrogens in male reproduction recently was suggested in adult mice deficient in estrogen receptor alpha. These mice became infertile primarily because of an interruption of fluid reabsorption by the efferent ductules of the epididymis, thus leading to a disruption of the seminifero...

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Changes in the arginine-vasopressin immunoreactive systems in male mice lacking a functional aromatase gene.

In male rodents, the arginine-vasopressin-immunoreactive (AVP-ir) neurones of the bed nucleus of the stria terminalis (BNST) and medial amygdala are controlled by plasma testosterone levels (decreased after castration and restored by exogenous testosterone). AVP transcription in these nuclei is increased in adulthood by a synergistic action of the androgenic and oestrogenic metabolites of testo...

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Nuclear lamins are structural protein components of the nuclear envelope. Mutations in LMNA, the gene coding for A-type lamins, result in several human hereditary diseases, the laminopathies, which include Emery-Dreifuss muscular dystrophy, dilated cardiomyopathy, familial partial lipodystrophy and Hutchinson-Gilford progeria. Similar to the human conditions, it has been shown that Lmna(-/-) mi...

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Insulin and growth factors activate the phosphatidylinositide-3-kinase pathway, leading to stimulation of several kinases including serumand glucocorticoid-inducible kinase isoform SGK3, a transport regulating kinase. Here, we explored the contribution of SGK3 to the regulation of renal tubular phosphate transport. Coexpression of SGK3 and sodium-phosphate cotransporter IIa significantly enhanc...

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Urea cycle defects and acute or chronic liver failure are linked to systemic hyperammonemia and often result in cerebral dysfunction and encephalopathy. Although an important role of the liver in ammonia metabolism is widely accepted, the role of ammonia metabolizing pathways in the liver for maintenance of whole-body ammonia homeostasis in vivo remains ill-defined. Here, we show by generation ...

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ژورنال

عنوان ژورنال: Proceedings of the National Academy of Sciences

سال: 1999

ISSN: 0027-8424,1091-6490

DOI: 10.1073/pnas.96.14.7986