Inositol trisphosphate enhances calcium release in skinned cardiac and skeletal muscle.

Inositol trisphosphate enhances calcium release in skinned cardiac and skeletal muscle.
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肌醇三磷酸可增强带皮心肌和骨骼肌中钙的释放。

DOI:
10.1152/ajpcell.1986.250.5.c807
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发表时间:
1986
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Godt,RE
Godt,RE
中科院分区:
--
文献类型:
--
作者:
Nosek,TM;Williams,MF;Zeigler,ST;Godt,RE

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其他实验室的实验表明,三磷酸肌醇(InsP 3)可能参与心肌和骨骼肌的兴奋-收缩偶联(ECC)过程。我们的研究结果支持这一假设。研究来自用皂苷剥皮的豚鼠乳头肌的纤维束(直径小于200微米)和来自青蛙半腱肌的机械剥皮的单纤维,我们发现钙诱导的力振荡(在含有低浓度乙二醇-双(β-氨基乙基醚)-N,N '-四乙酸和pCa 7.0的溶液中观察到)在幅度和频率上被低至1 μ M的InsP 3增强。InsP 3在10 μ M时通常可以在机械剥皮的青蛙骨骼肌中诱导这种振荡。在皮肤的心脏纤维中,InsP 3在次最大咖啡因浓度下比在接近最大咖啡因浓度下更大程度地增加咖啡因挛缩的幅度。InsP 3(30 μ M)对去皮心肌的钙敏感性或收缩器产生的最大力均无影响。我们得出结论,InsP 3对收缩机制没有直接影响,但它可以通过增强钙诱导的钙从肌浆网释放来调节ECC,可能来自相同的池,并通过与咖啡因相同的机制。
Experiments from other laboratories suggest that inositol trisphosphate (InsP3) may be involved in the excitation-contraction coupling (ECC) process of cardiac and skeletal muscle. Our results support this hypothesis. Studying fiber bundles (less than 200-microns diameter) from guinea pig papillary muscles skinned with saponin and mechanically skinned single fibers from frog semitendinosus muscle, we find that calcium-induced force oscillations (observed in solutions containing low ethyleneglycol-bis(beta-aminoethylether)-N,N'-tetraacetic acid and pCa 7.0) are enhanced in magnitude and frequency by InsP3 at concentrations as low as 1 microM. InsP3 at 10 microM can often induce such oscillations in mechanically skinned frog skeletal muscle. In skinned cardiac fibers, InsP3 increases the magnitude of caffeine contractures at submaximal caffeine concentrations to a greater extent than at near-maximal caffeine concentrations. InsP3 (30 microM) has no effect on either the calcium sensitivity or maximal force generated by the contractile apparatus of skinned cardiac muscle. We conclude that InsP3 has no direct effect on the contractile machinery but that it can modulate ECC by enhancing the calcium-induced release of calcium from the sarcoplasmic reticulum, possibly from the same pool and through the same mechanism as caffeine.
钙信使系统:综合观点。
DOI: 10.1152/physrev.1984.64.3.938
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影响因子: 33.6
作者:
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肌醇 1,4,5-三磷酸不能有效地从骨骼肌浆网微粒体中释放钙。
DOI: 10.1016/0006-291x(85)91048-4
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影响因子: 3.1
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DOI: --
发表时间: 1982
期刊: Journal of Biochemistry (Tokyo)
影响因子: --
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N. Yamamoto;M. Kasai
通讯作者: M. Kasai
肌醇三磷酸诱导人血小板膜释放 Ca2+。
DOI: --
发表时间: 1985
期刊: Biochemical and Biophysical Research Communications - BBRC
影响因子: --
作者:
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通讯作者: W. Dean
DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Ikemoto,N