Human neutrophil and macrophage chemokinesis induced by cardiopulmonary bypass: loss of DAME and IL-1 chemotaxis.

Abstract:

:Cardiopulmonary bypass (CPB) induces both cellular immunosuppression and an inflammatory response. In an effort to better characterize CPB-induced immune dysfunction, we examined the chemotaxic ability of human granulocytes and macrophages to D-Ala2-Met-enkephalin (DAME) and interleukin (IL)-1 alpha with computer-assisted microscopic image analysis before, during and after CPB. Spontaneous granulocyte and macrophage activation increased from 6% and 8% (before) to 52% and 44% (during) and then 39% and 31% after (38 h) CPB, respectively. These activated cells, characterized by conformational changes and locomotion, exhibited chemokinesis. Furthermore, no direct response to either DAME or IL-1 alpha was observed in the bypass and postoperative specimens. Cellular velocity was 0.14 and 0.07 microns s-1 for control spontaneously activated granulocytes and macrophages, respectively, and equal to the velocity observed for DAME and IL-1 alpha exposed cells, during and after CPB. CPB-unexposed cells, influenced only by the chemotaxic agents, exhibited a 3-4-fold increase in their velocity. Additionally, the migratory path of the activated cells obtained during and after CPB exhibited chemokinesis, rather than chemotaxis, when placed in a concentration gradient of either signal molecule. Cells exposed to fentanyl, the anesthetic agent, exhibited the same behavior as controls, as did those treated with morphine sulphate. However, at higher concentrations (> or = 10 ng ml-1) fentanyl and morphine reduced granulocyte and macrophage activity, demonstrating that CPB caused the opposite effect of fentanyl and also that CPB exposure overcame the pharmacological inhibitory effect of the mu opiate ligands.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Neuroimmunol

authors

Stefano GB,Bilfinger TV

doi

10.1016/0165-5728(93)90029-x

subject

Has Abstract

pub_date

1993-09-01 00:00:00

pages

189-97

issue

2

eissn

0165-5728

issn

1872-8421

pii

0165-5728(93)90029-X

journal_volume

47

pub_type

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