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二磷酸腺苷四磷酸(Ap4A)通过肾上腺嗜铬细胞中一种假定的P2Y嘌呤受体介导的钙离子储存动员

Ca(2+)-stores mobilization by diadenosine tetraphosphate, Ap4A, through a putative P2Y purinoceptor in adrenal chromaffin cells.

作者信息

Castro E, Pintor J, Miras-Portugal M T

机构信息

Departamento de Bioquímica, Facultad de Veterinaria, Universidad Complutense de Madrid, España.

出版信息

Br J Pharmacol. 1992 Aug;106(4):833-7. doi: 10.1111/j.1476-5381.1992.tb14421.x.

Abstract
  1. Diadenosine tetraphosphate (Ap4A) evoked a concentration-dependent increase in cytosolic [Ca2+] in resting chromaffin cells. The EC50 value for this action was 28.2 +/- 6.6 microM. This effect was also produced by diadenosine pentaphosphate (Ap5A) with an EC50 of 50 +/- 7 microM. 2. In contrast with this effect, pretreatment with Ap4A or Ap5A induced a 30% reduction in Ca2+ entry following 10 microM dimethylphenylpiperazinium. 3. The elevation in cytosolic [Ca2+] induced by Ap4A was persistent in approximately 100 nM external [Ca2+] and was sensitive to depletion of internal Ca2+ stores by a bradykinin prepulse or whole cell depletion in Ca2+. 4. The effect of Ap4A was mimicked and desensitized by the agonist adenosine 5'-O-(2-thiodiphosphate), and blocked by the P2Y-receptor antagonist, cibachrome blue. The P2X-receptor agonist alpha,beta-methylene adenosine 5'-triphosphate was inactive both by itself or in combination with Ap4A. This is compatible with a P2Y-purinoceptor-mediated action.
摘要
  1. 四磷酸二腺苷(Ap4A)可使静息嗜铬细胞胞质内的[Ca2+]浓度呈浓度依赖性升高。此作用的半数有效浓度(EC50)值为28.2±6.6微摩尔。五磷酸二腺苷(Ap5A)也产生此效应,其EC50为50±7微摩尔。2. 与该效应相反,用Ap4A或Ap5A预处理可使10微摩尔二甲基苯基哌嗪作用后Ca2+内流减少30%。3. 在细胞外[Ca2+]约为100纳摩尔时,Ap4A诱导的胞质[Ca2+]升高持续存在,且对缓激肽预脉冲或全细胞Ca2+耗竭所致的细胞内Ca2+储存耗竭敏感。4. 激动剂5'-O-(2-硫代二磷酸)腺苷模拟并使Ap4A的效应脱敏,P2Y受体拮抗剂锡巴铬蓝可阻断该效应。P2X受体激动剂α,β-亚甲基腺苷5'-三磷酸单独或与Ap4A联合使用均无活性。这与P2Y嘌呤受体介导的作用相符。

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