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- W2006703820 abstract "We had previously shown that there was a loss of sensitivity of muscarinic receptors (mAChR) to stimulation by cholinergic agonists (as assessed by examining oxotremorine enhancement of K(+)-evoked release of dopamine from neostriatal slices) in animals that had been exposed to energetic particles (56Fe, 600 MeV/n), an important component of cosmic rays. This loss of mAChR sensitivity was postulated to be the result of radiation-induced alterations in phosphoinositide-mediated signal transduction. The present experiments were undertaken as a first step toward determining the locus of these radiation-induced deficits in signal transduction by examining K+ enhancement of release of dopamine in 56Fe-exposed animals (0, 0.1, and 1.0 Gy) with agents [A23187, a potent Ca2+ ionophore, or 1,4,5-inositol trisphosphate (IP3)] that bypass the mAChR-G protein interface and by comparing the response to oxotremorine-enhanced K(+)-evoked release of dopamine. Results showed that although oxotremorine-enhanced K(+)-evoked release of dopamine was reduced significantly in the radiation groups, no radiation effects were seen when A23187 or IP3 was used to enhance K(+)-evoked release of dopamine. Since similar findings have been observed in aging, the results are discussed in terms of the parallels between aging and radiation effects in signal transduction that might exist in the neostriatum." @default.
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- W2006703820 title "Deficits in the Sensitivity of Striatal Muscarinic Receptors Induced by 56 Fe Heavy-Particle Irradiation: Further Äge-Radiation Parallels" @default.
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- W2006703820 doi "https://doi.org/10.2307/3578303" @default.
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