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- W2034051675 abstract "1. To determine the role of cellular Ca2+ in desensitization, acetylcholine(ACh)-induced desensitization was studied under Ca2+-free condition in guinea-pig ileal longitudinal muscle. 2. Pretreatment of the tissue with 10(-4) M ACh (desensitizing treatment) in normal Tyrode solution caused desensitization of the responses both to ACh and histamine. The desensitizing treatment performed in Ca2+-free solution enhanced desensitization of the responses to ACh and histamine significantly. 3. The desensitizing treatment with ACh caused suppression of the responses to high K+ (tonic component) and Bay K 8644. The desensitizing treatment performed in Ca2+-free solution potentiated the suppression of the responses to high K+ and Bay K 8644 significantly. 4. ACh-induced desensitization was enhanced significantly in the presence of a protein kinase C inhibitor, 1-(5-isoquinolinesulfonyl)-2-methylpiperazine(H-7, 10(-4) M) to a similar extent as desensitization obtained under Ca2+-free condition, but not in the presence of a non-specific and less potent kinase inhibitor, N-(2-guanidinoethyl)-5-isoquinolinesulfonamide hydrochloride (HA1004, 10(-4) M). 5. These results suggested that voltage-gated Ca2+ channels were involved in ACh-induced desensitization and that intracellular Ca2+, which was increased during the stimulation with ACh, inhibited desensitization through the activation of protein kinase C. This kinase could have activated or protected Ca2+ channels during the desensitization process to reduce desensitization." @default.
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- W2034051675 date "1999-10-01" @default.
- W2034051675 modified "2023-09-27" @default.
- W2034051675 title "Enhancement of acetylcholine-induced desensitization of guinea-pig ileal longitudinal muscle in Ca2+-free conditions" @default.
- W2034051675 doi "https://doi.org/10.1046/j.1365-2680.1999.00146.x" @default.
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