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- W2201601673 abstract "The effects of short-term hyperthyroidism in vivo on the status of the components of the fat-cell hormone-sensitive adenylate cyclase were investigated. The number of beta-adrenergic receptors was elevated by about 25% in membranes of fat-cells isolated from hyperthyroid rats as compared with euthyroid rats, but their affinity for radioligand was unchanged. Membranes of hyperthyroid-rat fat-cells displayed less than 65% of the normal complement of receptors for [3H]cyclohexyladenosine. The affinity of the receptors for this ligand was normal. In contrast with the marked increase in the amounts of the alpha-subunits of the guanine nucleotide-binding proteins Gi (Mr 41,000) and Go (Mr 39,000) observed in the hypothyroid state [Malbon, Rapiejko & Mangano (1985) J. Biol. Chem. 260, 2558-2564], the amounts of alpha-Gi, alpha-Go as well as alpha-Gs subunits [Mr 42,000 (major) and 46,000/48,000 (minor)] were not changed by hyperthyroidism. Adenylate cyclase activity in response to forskolin, guanosine 5′-[gamma-thio]triphosphate or isoprenaline, in contrast, was decreased by 30-50% in fat-cell membranes from hyperthyroid rats. Fat-cells isolated from hyperthyroid rats accumulated cyclic AMP to less than 50% of the extent in their euthyroid counterparts in the presence of adenosine deaminase and either adrenaline or forskolin, suggesting a decrease in the amount or activity of the catalytic subunit of adenylate cyclase. In the absence of exogenous adenosine deaminase, cyclic AMP accumulation in response to adrenaline was elevated rather than decreased in fat-cells from hyperthyroid rats. The inhibitory influence of adenosine is apparently limited in the hyperthyroid state by the decreased complement of inhibitory R-site purinergic receptors in these fat-cells. Short-term hyperthyroidism modulates the fat-cell adenylate cyclase system at the receptor level (beta-receptor number increased, R-site purinergic-receptor number decreased) and the catalytic subunit of adenylate cyclase." @default.
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- W2201601673 title "Short-term hyperthyroidism modulates adenosine receptors and catalytic activity of adenylate cyclase in adipocytes" @default.
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- W2201601673 doi "https://doi.org/10.1042/bj2410765" @default.
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