PMID: 7544315Aug 15, 1995Paper

Targeted disruption of the pituitary glycoprotein hormone alpha-subunit produces hypogonadal and hypothyroid mice

Genes & Development
S K KendallS A Camper

Abstract

Pituitary thyrotropin (TSH) and gonadotropins (LH and FSH) are thought to be critical for thyroid and gonadal development and function. Each of these pituitary hormones is a heterodimer composed of a common alpha-subunit and unique beta-subunit, and heterodimerization is required for function. No mutations in the alpha-subunit or any of the beta-subunit genes have been reported in mice. To assess directly the functional role of TSH, LH, and FSH in thyroid and gonadal development, we created a disruption of the alpha-subunit gene by homologous recombination. The homozygous mutant animals were hypogonadal and exhibited profound hypothyroidism resulting in dwarfism. Thyroid development was arrested in late gestation, but GnRH neuron migration, development of secondary sex organs, and fetal and neonatal gonadal development were normal. This establishes the importance of thyrotropin in ontogeny and reveals that fetal pituitary gonadotropins are not required for sexual differentiation or genital development in male or female fetuses. The pituitary cells that produce TSH beta-subunit exhibited dramatic hypertrophy and hyperplasia as a result of the lack of thyroid function. This proliferation response occurred at the expense of somato...Continue Reading

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