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Pit-1-dependent expression of the receptor for growth hormone releasing factor mediates pituitary cell growth

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Abstract

IN Snell (dw) and Jackson (dwj) dwarf mice, mutations in the gene encoding Pit-1, a tissue-specific POU-domain transcription factor, lead to the absence of somatotroph, lactotroph and thyrotroph cells1–6. Pre-somatotroph proliferation is stimulated by increased intracellular levels of cyclic AMP, normally induced by growth hormone releasing factor (GRF; refs 7–17). Here we report the cloning of mouse and rat complementary DNAs encoding a new member of the seven-transmembrane-helix, G-protein-coupled receptor family restricted to the pituitary gland, which mediates increases in intracellular cAMP and cAMP-dependent gene transcription in response to GRF. The receptor is expressed in a spatial and temporal pattern corresponding precisely to growth hormone gene expression, and neither is expressed in dw/dw mice. The pituitary hypoplasia in these mice thus appears to be due, at least in part, to the absence of GRF receptor, which is in turn due to the absence of functional Pit-1.

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Authors and Affiliations

  1. Howard Hughes Medical Institute, University of California, San Diego, School and Department of Medicine, 9500 Gilman Drive, La Jolla, California, 92093-0648, USA

    Sheng-Cai Lin & Michael G. Rosenfeld

  2. Eukaryotic Regulatory Biology Program, University of California, San Diego, School and Department of Medicine, 9500 Gilman Drive, La Jolla, California, 92093-0648, USA

    Chijen Lin, Sheng-Cai Lin, Chia-Ping Chang & Michael G. Rosenfeld

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  1. Chijen Lin
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  2. Sheng-Cai Lin
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  3. Chia-Ping Chang
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  4. Michael G. Rosenfeld
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Lin, C., Lin, SC., Chang, CP. et al. Pit-1-dependent expression of the receptor for growth hormone releasing factor mediates pituitary cell growth. Nature 360, 765–768 (1992). https://doi.org/10.1038/360765a0

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  • DOI: https://doi.org/10.1038/360765a0

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