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Endocrinology, Vol 114, 2054-2059, Copyright © 1984 by Endocrine Society

ARTICLES

Growth hormone (GH)-releasing factor does not regulate GH release or GH mRNA levels in GH3 cells

FN Zeytin, GG Gick, P Brazeau, N Ling, M McLaughlin and C Bancroft

Previous studies have shown that GH-releasing factor (GRF) regulates both GH production and GH mRNA levels in primary cultures of rat pituitary cells. Investigations were carried out to ascertain the ability of GRF to regulate GH production or mRNA levels in a clonal strain of rat pituitary tumor (GH3) cells. Incubation of the cells with GRF at 1-1000 nM for 4 h to 10 days did not result in a stimulation of GH or PRL production, nor did it affect the cytoplasmic levels of the corresponding mRNAs. The lack of response to GRF was not affected by dexamethasone, T3, or serum. We conclude that GH3 cells do not provide a useful model system for studies of the mechanism(s) of action of GRF on either GH release or GH gene expression.


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