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• W2051176796 abstract "Vascular hyporeactivity is an important factor in irreversible shock, and post-shock mesenteric lymph (PSML) blockade improves vascular reactivity after hemorrhagic shock. This study explored the possible involvement of myosin light chain kinase (MLCK) in PSML-mediated vascular hyporeactivity and calcium desensitization. Rats were divided into sham (n=12), shock (n=18), and shock+drainage (n=18) groups. A hemorrhagic shock model (40 ± 2 mmHg, 3 h) was established in the shock and shock+drainage groups. PSML drainage was performed from 1 to 3 h from start of hypotension in shock+drainage rats. Levels of phospho-MLCK (p-MLCK) were determined in superior mesenteric artery (SMA) tissue, and the vascular reactivity to norepinephrine (NE) and sensitivity to Ca²⁺ were observed in SMA rings in an isolated organ perfusion system. p-MLCK was significantly decreased in the shock group compared with the sham group, but increased in the shock+drainage group compared with the shock group. Substance P (1 nM), an agonist of MLCK, significantly elevated the decreased contractile response of SMA rings to both NE and Ca²⁺ at various concentrations. Maximum contractility (Emax) in the shock group increased with NE (from 0.179 ± 0.038 to 0.440 ± 0.177 g/mg, P<0.05) and Ca²⁺ (from 0.515 ± 0.043 to 0.646 ± 0.096 g/mg, P<0.05). ML-7 (0.1 nM), an inhibitor of MLCK, reduced the increased vascular response to NE and Ca²⁺ at various concentrations in the shock+drainage group (from 0.744 ± 0.187 to 0.570 ± 0.143 g/mg in Emax for NE and from 0.729 ± 0.037 to 0.645 ± 0.056 g/mg in Emax for Ca²⁺, P<0.05). We conclude that MLCK is an important contributor to PSML drainage, enhancing vascular reactivity and calcium sensitivity in rats with hemorrhagic shock." @default.
• W2051176796 created "2016-06-24" @default.
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• W2051176796 date "2013-07-01" @default.
• W2051176796 modified "2023-09-27" @default.
• W2051176796 title "Myosin light chain kinase is necessary for post-shock mesenteric lymph drainage enhancement of vascular reactivity and calcium sensitivity in hemorrhagic-shocked rats" @default.
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• W2051176796 doi "https://doi.org/10.1590/1414-431x20132900" @default.
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