Enzymatic changes in myosin regulatory proteins may explain vasoplegia in terminally ill patients with sepsis

Bioscience Reports
Wentao ZhengXiu-he Ouyang

Abstract

The current study was conducted with the hypothesis that failure of maintenance of the vascular tone may be central to failure of the peripheral circulation and spiralling down of blood pressure in sepsis. Namely, we examined the balance between expression of myosin light chain (MLC) phosphatase and kinase, enzymes that regulate MLCs dephosphorylation and phosphorylation with a direct effect on pharmacomechanical coupling for smooth muscle relaxation and contraction respectively. Mechanical recordings and enzyme immunoassays of vascular smooth muscle lysates were used as the major methods to examine arterial biopsy samples from terminally ill sepsis patients. The results of the present study provide evidence that genomic alteration of expression of key regulatory proteins in vascular smooth muscles may be responsible for the relentless downhill course in sepsis. Down-regulation of myosin light chain kinase (MLCK) and up-regulation of MLCK may explain the loss of tone and failure to mount contractile response in vivo during circulation. The mechanical studies demonstrated the inability of the arteries to develop tone when stimulated by phenylephrine in vitro. The results of our study provide indirect hint that control of inflamm...Continue Reading

References

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Citations

Feb 6, 2017·Cellular and Molecular Life Sciences : CMLS·Michael SchnoorAlexander Zarbock
Jun 20, 2017·Journal of Clinical Anesthesia·Henry LiuMichael S Green

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Methods Mentioned

BETA
biopsy
ELISA
biopsies

Software Mentioned

Windaq

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