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- W2007350885 abstract "Both thyroid-stimulating hormone (TSH) and long-acting thyroid stimulator (LATS) stimulated adenyl cyclase activity in plasma membranes obtained from bovine thyroid glands. The stimulation induced by LATS was much less than that obtained with maximal amounts of TSH. LATS inhibited TSH stimulation of adenyl cyclase activity while an equivalent amount of normal human γ-globulin did not influence basal or TSH-stimulated activity. The inhibition by LATS appeared to be noncompetitive and was greatest when the plasma membranes were initially exposed to LATS for 30 min at 0°C before being incubated with TSH for 10 min at 37°C. Inhibition could still be demonstrated when the plasma membranes were incubated for 30 min at 0°C with TSH before the addition of LATS. Prolonging the period of incubation of plasma membranes with LATS from 30 to 60 min did not augment the stimulation of adenyl cyclase or increase the inhibition of the effect of TSH. Papain digests of LATS also increased adenyl cyclase activity of thyroid plasma membrane and inhibited the stimulation induced by TSH. The inhibitory effect of LATS was not completely specific for TSH and thyroid plasma membranes since glucagon stimulation of adenyl cyclase in hepatic plasma membranes was also inhibited, but to a lesser extent. In contrast to the results obtained with thyroid plasma membranes, LATS did not influence basal adenyl cyclase activity in hepatic plasma membranes. Furthermore equivalent amounts of normal human γ-globulin also decreased glucagon stimulation of adenyl cyclase activity in plasma membranes obtained from liver. The present data suggest that LATS stimulation of adenyl cyclase in thyroid plasma membranes might be due to a change in the membrane configuration rather than binding to a specific receptor site. Such modification of the membrane structure could interfere with the binding of TSH to specific receptors or to the subsequent stimulation of adenyl cyclase. However, the results do not exclude the possibility that some component in the preparation other than LATS might be responsible for the inhibition of the stimulation by TSH." @default.
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- W2007350885 title "Effects of Long-Acting Thyroid Stimulator on Thyrotropin Stimulation of Adenyl Cyclase Activity in Thyroid Plasma Membranes" @default.
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- W2007350885 doi "https://doi.org/10.1172/jci106834" @default.
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