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- W2069090908 abstract "1. Nicotinic acetylcholine receptor (AChR)-operated non-contractile Ca2+ mobilization (unaccompanied by muscle contraction) depressed contractile Ca2+ mobilization (accompanied by muscle contraction) in mouse diaphragm muscles. In the process of nicotinic AChR desensitization, the enhancing role of calcitonin gene-related peptide (CGRP) on the non-contractile Ca2(+)-induced depression of contractile Ca2+ mobilization was investigated by measurement of Ca2(+)-aequorin luminescence in the presence of neostigmine (0.1 microM). 2. When the phrenic nerve was stimulated with paired pulses at intervals of 150, 300, 600, 1000 and 2000 ms, contractile Ca2+ transients were elicited during the generation of non-contractile Ca2+ mobilization. The amplitude of the contractile Ca2 transients elicited by the second pulse (S2) was depressed at the shorter pulse intervals, but not at the longer pulse intervals. 3. The extent of depression of S2 was enhanced when the duration of non-contractile Ca2+ mobilization was prolonged by CGRP (10 nM). However, CGRP failed to enhance the depression of S2 when non-contractile Ca2+ mobilization was not observed at the low external Ca2+ concentration (1.3 mM). 4. The enhancing effect by CGRP on the depression of S2 was counteracted by staurosporine (3 nM), a protein kinase-C inhibitor, despite prolongation of the duration of non-contractile Ca2+ mobilization. 5. When H-89 (1 microM), a protein kinase-A inhibitor, completely blocked non-contractile Ca2+ mobilization, the depression of S2 was diminished. The prolongation of the duration of non-contractile Ca2+ mobilization by AA373 (300 microM), a protein kinase-A activator, enhanced the depression of S2. The enhancing effect was observed neither with CGRP nor with AA373, in the presence of H-89 (0.1 microM). 6. These findings suggest that the CGRP mobilizes non-contractile Ca2+ through activation of protein kinase-A, which in turn may activate protein kinase-C, then enhance the desensitization of postsynaptic nicotinic AChRs at the neuromuscular junction." @default.
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- W2069090908 title "Enhancement by calcitonin gene-related peptide of non-contractile Ca2+-induced nicotinic receptor desensitization at the mouse neuromuscular junction" @default.
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- W2069090908 doi "https://doi.org/10.1111/j.1476-5381.1996.tb15632.x" @default.
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