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Pharmacological inhibition of p38 mitogen‐activated protein kinases affects KC/CXCL1‐induced intraluminal crawling, transendothelial migration, and chemotaxis of neutrophils in vivo

Authors: Najia Xu; Mokarram Hossain; Lixin Liu;

Pharmacological inhibition of p38 mitogen‐activated protein kinases affects KC/CXCL1‐induced intraluminal crawling, transendothelial migration, and chemotaxis of neutrophils in vivo

Abstract

Leukocyte recruitment to the inflammation site is a multi‐step process governed by specific signalling cascades. After adhesion in the lumen, leukocytes crawl to optimal sites at endothelial junctions and transmigrate to extravascular tissue in a Mac‐1‐dependent manner. The signalling mechanisms that regulate post‐adhesion steps of intraluminal crawling, transmigration and chemotaxis in tissue remain incompletely understood. The present study explored the effect of p38 MAPK inhibitor SB203580 on various steps of neutrophil recruitment triggered by chemokine KC (CXCL1) gradient in microvasculature of murine cremaster muscle using intravital microscopy and time‐lapsed video analysis. SB203580 (100 nM) did not change leukocyte rolling but significantly attenuated neutrophil adhesion, emigration, transmigration time and detachment time, and impaired the initiation of crawling and transmigration. In response to KC chemotactic gradient, SB203580 significantly reduced the velocity of migration and chemotaxis index of neutrophils in tissue. The upregulation of Mac‐1 expression in neutrophils stimulated by KC was significantly blunted by SB203580 in vitro. Collectively, our findings demonstrate that pharmacological suppression of p38 MAPK significantly impairs multiple steps of neutrophil recruitment in vivo.

Related Organizations
Keywords

Male, Xylazine, Neutrophils, Pyridines, Chemokine CXCL1, Imidazoles, Transendothelial and Transepithelial Migration, p38 Mitogen-Activated Protein Kinases, Mice, Inbred C57BL, Chemotaxis, Leukocyte, Mice, Neutrophil Infiltration, Pathology, RB1-214, Animals, Ketamine, Enzyme Inhibitors, Cells, Cultured, Research Article

  • BIP!
    Impact byBIP!
    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    16
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
16
Average
Average
Top 10%
Green
gold