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The interaction of prolactin (PRL) with its receptor leads to activation of the tyrosine kinase, Janus kinase 2 (JAK2). In the cytoplasmic juxtamembrane region, a short segment (Box 1) which is conserved in other receptors of the PRL/growth hormone (GH)/cytokine receptor family, is required for...
In previous work it was shown that the immune cytokine interferon- γ (IFN- γ ) inhibits hormone secretion in anterior pituitary (AP) cell cultures, an action most likely mediated by folliculostellate (FS) cells. In the present study, we wanted to investigate whether nitric oxide (NO) is...
Administration of tumour necrosis factor- α (TNF α ), interleukin-1 β (IL-1 β ) and interleukin-6 (IL-6) to animals and humans results in changes in circulating thyroid hormone concentrations similar to those seen in non-thyroidal illness (NTI). Inflammatory cytokines have been postulated as...
Mammary specific expression of elevated levels of mouse mammary tumor virus (MMTV) contributes to mammary carcinogenesis. Mechanisms which regulate provirus expression have not been completely defined. Using a MMTV-long repeat terminal (MMTV-LRT) directed chloramphenicol-acetyltransferase (CAT)...
Peroxisome proliferator-activated receptors (PPARs) are ligand-activated nuclear receptors that regulate transcription of target genes. Since attempts have been made to correlate the ingestion of high-fat diets, itself a peroxisome proliferator, with the occurrence of breast cancer, we set about...
Rats deficient in vitamin A express low levels of P4502C7 mRNA in the liver. Administration of all- trans retinoic acid (at-RA) or growth hormone (GH) to deficient animals only partially restored the expression whereas the combined treatment returned the P4502C7 mRNA levels to that observed in...
The glucocorticoid response element of the rat liver/skeletal muscle 6- phosphofructo-2-kinase/fructose-2,6-bisphosphatase gene was characterized. The element is composed of two tandem hormone receptor binding sites separated by 12 base pairs. Addition of dexamethasone to HeLa cells transiently...
The purpose of this study was to determine the role of growth hormone (GH) in regulating expression of the chicken GH receptor (cGHR) gene by comparing the levels of cGHR mRNA in livers of normal chickens with that of GHR-deficient dwarf chickens. Since the sex-linked dwarf chicken lacks a...
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