Potentiating and inhibitory effects of periodate-oxidized ATP analogs on contractions of vas deferens to ATP.

Potentiating and inhibitory effects of periodate-oxidized ATP analogs on contractions of vas deferens to ATP.
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高碘酸盐氧化 ATP 类似物对输精管 ATP 收缩的增强和抑制作用。

DOI:
10.1016/0014-2999(95)00352-l
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发表时间:
1995
影响因子:
5
通讯作者:
Grant,LJ
Grant,LJ
中科院分区:
医学2区
文献类型:
--
作者:
Fedan,JS;Grant,LJ

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以前的研究表明,用亲和标记物高碘酸氧化ATP(2′,3 ′-二醛ATP)处理豚鼠离体输精管,导致对ATP的双相收缩反应的两种不可逆效应,即,增强P2 X嘌呤受体介导的第一相和抑制胞外激酶介导的第二相。本实验旨在评估高碘酸盐氧化的ADP、高碘酸盐氧化的AMP和高碘酸盐氧化的腺苷是否产生类似的作用。高碘酸氧化的ATP和高碘酸氧化的ADP(10− 2 M)引起输精管收缩(高碘酸氧化的ATP >高碘酸氧化的ADP;高碘酸氧化的AMP和高碘酸氧化的腺苷没有激动剂活性。在将制备物与10− 2 M高碘酸氧化的ATP、高碘酸氧化的ADP、高碘酸氧化的AMP或高碘酸氧化的腺苷孵育5分钟后,收缩至次最大ATP浓度的第一阶段增强。同时,高碘酸氧化的ATP,高碘酸氧化的ADP和高碘酸氧化的AMP抑制第二收缩相,而高碘酸氧化的腺苷没有。结果表明,5′-磷酸产生增强和抑制作用的需要是不同的:5′-磷酸不需要增强ATP收缩的第一相,但至少需要一个5′-磷酸抑制收缩的第二相。
Previous studies have shown that treatment of guinea-pig isolated vas deferens with the affinity label periodate-oxidized ATP (2′,3′-dialdehyde ATP), results in two irreversible effects on biphasic contractile responses to ATP, i.e., potentiation of the P2Xpurinoceptor-mediated first phase and inhibition of the ecto-kinase-mediated second phase. The present experiments were designed to evaluate whether periodate-oxidized ADP, periodate-oxidized AMP, and periodate-oxidized adenosine, produce similar effects. Periodate-oxidized ATP and periodate-oxidized ADP (10−2M) elicited contraction of the vas deferens (periodate-oxidized ATP > periodate-oxidized ADP; periodate-oxidized AMP and periodate-oxidized adenosine had no agonist activity. After incubation of the preparations for 5 min with 10−2M periodate-oxidized ATP, periodate-oxidized ADP, periodate-oxidized AMP or periodate-oxidized adenosine, the first phase of contraction to submaximal ATP concentrations was potentiated. Simultaneously, periodate-oxidized ATP, periodate-oxidized ADP and periodate-oxidized AMP inhibited the second contractile phase, whereas periodate-oxidized adenosine did not. The results indicate that the requirement for 5′-phosphate to produce potentiation and inhibition is different: 5′-phosphate is not needed to potentiate the first phase of contraction to ATP, but at least one 5′-phosphate is required to inhibit the second phase of contraction.
DOI: 10.1111/j.1476-5381.1987.tb11257.x
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