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    The effect of midazolam on neutrophil mitogen-activated protein kinase.

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    Authors
    Ghori, Kamran
    O'Driscoll, James
    Shorten, George
    Affiliation
    Cork University Hospital, Cork, Ireland. kamrang@hotmail.com
    Issue Date
    2010-06
    MeSH
    Antigens, CD11b
    Antigens, CD18
    Enzyme Inhibitors
    Humans
    Hypnotics and Sedatives
    Imidazoles
    Midazolam
    Neutrophils
    Pyridines
    Reperfusion Injury
    p38 Mitogen-Activated Protein Kinases
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    Citation
    The effect of midazolam on neutrophil mitogen-activated protein kinase. 2010, 27 (6):562-5 Eur J Anaesthesiol
    Journal
    European journal of anaesthesiology
    URI
    http://hdl.handle.net/10147/200290
    DOI
    10.1097/EJA.0b013e3283328442
    PubMed ID
    20421794
    Abstract
    Neutrophil p38 mitogen-activated protein kinase (MAPK) is a key enzyme in the intracellular signalling pathway that is responsible for many neutrophil functions, which are important in neutrophil-endothelial interaction. The imidazole compounds are inhibitors of this enzyme system. The objectives of this in-vitro investigation were to examine the effect of midazolam on neutrophil p38 MAPK activation (phosphorylation) following in-vitro ischaemia-reperfusion injury, and the expression of adhesion molecule CD11b/CD18.
    In-vitro injury was produced by incubating the neutrophils with N-formyl-methionyl-leucyl-phenylalanine. Neutrophils were treated with either 10 or 50 times the therapeutic plasma concentrations of midazolam and SB203580 (known inhibitor of p38 MAPK). The concentrations of phosphorylated p38 MAPK and expression of neutrophil adhesion molecules CD11b/CD18 were measured. Flow cytometry was used to estimate adhesion molecule expression.
    The concentration of phosphorylated p38 MAPK was less in neutrophils subjected to ischaemia-reperfusion and treated with midazolam either 10 microg ml [13.6 (3.2) ng ml] or 50 microg ml [12.4 (3.6) ng ml], or SB203580 [13 (2.6) ng ml] than those subjected to ischaemia-reperfusion alone [18 (3.18) ng ml] at a P value of less than 0.05.Following ischaemia-reperfusion injury, CD11b/CD18 expression (expression mean channel fluorescence) on neutrophils was greater when compared with controls. The magnitudes of CD11b and CD18 expression on ischaemia-reperfusion-injured neutrophils were decreased by midazolam (10 microg ml) as compared with control of 10.3 (2.6) vs. 14 (3.1) microg ml and 28.3 (12.9) vs. 44 (12.1) microg ml, respectively, at a P value of less than 0.05. Similarly, the expression of CD11b and CD18 was less in ischaemia-reperfusion-injured neutrophils treated with inhibitor of 10.3 (2.8) vs. 14 (3.18) microg ml and 29.5 (12.5) vs. 44.3 (12.3) microg ml when compared with controls at a P value of less than 0.05.
    Midazolam diminishes in-vitro ischaemia-reperfusion-induced phosphorylation of p38 MAPK in neutrophils. This decrease in p38 MAPK activation results in decreased neutrophil CD11b/CD18 molecule expression.
    Item Type
    Article
    Language
    en
    ISSN
    1365-2346
    ae974a485f413a2113503eed53cd6c53
    10.1097/EJA.0b013e3283328442
    Scopus Count
    Collections
    Cork University Hospital

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