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• W2168078204 startingPage "603" @default.
• W2168078204 abstract "Surface cAMP receptors on Dictyostelium cells are linked to several second messenger systems and mediate multiple physiological responses, including chemotaxis and differentiation. Activation of the receptor also triggers events which desensitize signal transduction. These events include the following: 1) loss of ligand binding without loss of receptor protein; 2) phosphorylation of the receptor protein, which may lead to impaired signal transduction; 3) redistribution and degradation of the receptor protein; and 4) decrease of cyclic AMP (cAMP) receptor mRNA levels. These mechanisms of desensitization were investigated with the use of mutant synag7, with no activation of adenylyl cyclase; fgdC, with no activation of phospholipase C; and fgdA, with defects in both pathways. cAMP-induced receptor phosphorylation and loss of ligand binding activity was normal in all mutants. In contrast, cAMP-induced degradation of the receptor was absent in all mutants. The cAMP-induced decrease of cAMP-receptor mRNA levels was normal in mutant synag7, but absent in mutant fgdC. Finally, the cAMP analogue (Rp)-cAMPS induced loss of ligand binding without inducing second messenger responses or phosphorylation, redistribution, and degradation of the receptor. We conclude that 1) loss of ligand binding can occur in the absence of receptor phosphorylation; 2) loss of ligand binding and receptor phosphorylation do not require the activation of second messenger systems; 3) cAMP-induced degradation of the receptor may require the phosphorylation of the receptor as well as the activation of at least the synag7 and fgdC gene products; and 4) cAMP-induced decrease of receptor mRNA levels requires the activation of the fgdC gene product and not the synag7 gene product. These results imply that desensitization is composed of multiple components that are regulated by different but partly overlapping sensory transduction pathways." @default.
• W2168078204 created "2016-06-24" @default.
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• W2168078204 date "1992-06-01" @default.
• W2168078204 modified "2023-09-27" @default.
• W2168078204 title "cAMP-induced desensitization of surface cAMP receptors in Dictyostelium: different second messengers mediate receptor phosphorylation, loss of ligand binding, degradation of receptor, and reduction of receptor mRNA levels." @default.
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• W2168078204 doi "https://doi.org/10.1091/mbc.3.6.603" @default.
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