Effects of guanosine nucleotides on skinned smooth muscle tissue of the rabbit mesenteric artery.

Effects of guanosine nucleotides on skinned smooth muscle tissue of the rabbit mesenteric artery.
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鸟苷核苷酸对兔肠系膜动脉去皮平滑肌组织的影响。

DOI:
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发表时间:
1989
期刊:
Journal of Physiology
影响因子:
--
通讯作者:
H. Kuriyama
H. Kuriyama
中科院分区:
--
文献类型:
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作者:
T. Fujiwara;T. Itoh;Y. Kubota;H. Kuriyama

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1.研究了三磷酸鸟苷(GTP)和5 ′-O-(3-硫代)三磷酸鸟苷(GTP γ S)对家兔肠系膜动脉带皮平滑肌组织力学性能的影响。2.在由皂苷制备的皮肤肌肉组织中,GTP(高于100 μ M)和GTP γ S(高于1 μ M)在存在1 μ M离子霉素(储存的Ca 2+的消耗剂)的情况下增强了Ca 2+诱导的收缩(用2 mM EGTA缓冲的0.3 μ M-Ca 2+)。在存在10 microM-GTP γ S的情况下观察到的浓度-反应(pCa-张力)关系向左移动,而10 microM-Ca 2+诱发的最大反应没有变化。GTP的作用是可逆的,但GTP γ S的作用是不可逆的。3. GTP γ S对Ca 2+诱导的收缩的增强伴随肌球蛋白轻链磷酸化的增加和松弛试验测量的缩短速度的增加。4. GTP γ S对MgATP在无钙溶液(4 mM EGTA)中诱发的皮肤肌肉组织的Ca 2+非依赖性收缩没有影响,随后用含有腺苷5 '-o-(3-硫代)三磷酸(ATP γ S)的僵直溶液处理。5.目前的结果表明,由于收缩蛋白的Ca 2+敏感性增加,GTP和GTP γ S增强了皮肤肌肉组织中Ca 2+诱导的收缩。鸟苷酸对收缩蛋白的这些增强作用与蛋白激酶C的增强作用进行了比较。
1. Effects of guanosine triphosphate (GTP) and guanosine 5'‐o‐(3‐thio)triphosphate (GTP gamma S) on mechanical properties of skinned smooth muscle tissues of the rabbit mesenteric artery were investigated. 2. In skinned muscle tissues prepared by saponin, GTP (above 100 microM) and GTP gamma S (above 1 microM) enhanced the Ca2+‐induced contraction (0.3 microM‐Ca2+ buffered with 2 mM‐EGTA) in the presence of 1 microM‐ionomycin, a depletor of stored Ca2+. The concentration‐response (pCa‐tension) relationship observed in the presence of 10 microM‐GTP gamma S shifted to the left with no change in the maximum response evoked by 10 microM‐Ca2+. The action of GTP was reversible but that of GTP gamma S was not. 3. The enhancement of the Ca2+‐induced contraction by GTP gamma S occurred with increases in the phosphorylation of myosin light chain and in the shortening velocity as measured with the slack test. 4. GTP gamma S had no effect on the Ca2+‐independent contraction of skinned muscle tissues evoked by MgATP in Ca2+‐free solution (4 mM‐EGTA), following treatment with rigor solution containing adenosine 5'‐o‐(3‐thio)triphosphate (ATP gamma S). 5. The present results indicate that GTP and GTP gamma S enhance the Ca2+‐induced contraction in skinned muscle tissues due to increase in the Ca2+ sensitivity of contractile proteins. These enhancing actions of guanosine nucleotides on contractile proteins are discussed in comparison to those of protein kinase C.
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DOI: --
发表时间: 1986
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影响因子: --
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DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
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通讯作者: Gill,DL
DOI: 10.1073/pnas.82.15.5231
发表时间: 1985-08
影响因子: 11.1
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发表时间: 1986
影响因子: 21.1
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DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
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