Abstract:
:Haemorrhage produces alterations in macrophage, T and B cell function. In order to better define the mechanism for the effects of blood loss on immune response, we examined function of and cytokine production by purified T cells, CD4+ and CD8+ subpopulations after blood loss. Whereas T and CD4+ cells from control, unhaemorrhaged animals produced no alteration in proliferation when added to cultures of mitogen-stimulated splenocytes from normal mice, proliferation was decreased when T or CD4+ cells from haemorrhaged mice were included. The addition of CD8+ cells from haemorrhaged animals to mitogen-stimulated cultures reduced proliferation by approximately 50% more than that found when CD8+ cells from control, unhaemorrhaged animals were included. Supernatants of mitogen-stimulated splenocytes from haemorrhaged mice contained significantly less IL-2 and interferon-gamma (IFN-gamma) than did those from control, unhaemorrhaged mice. CD4+ populations from haemorrhaged mice produced significantly more IL-10, and significantly less IFN-gamma, than did CD4+ cells from control, unhaemorrhaged mice. There were no significant differences in IL-2, IL-4, IL-10 or IFN-gamma production by CD8+ cells from haemorrhaged or control mice. The present experiments demonstrate that haemorrhage affects both CD4+ and CD8+ T cell subsets. In particular, haemorrhage appeared to activate CD4+, Th2 cells, with concomitant suppression of the Th1 subpopulation. These results provide a mechanism which may contribute to the alterations in cytokine production previously described to occur following blood loss.
journal_name
Clin Exp Immunoljournal_title
Clinical and experimental immunologyauthors
Abraham E,Chang YHdoi
10.1111/j.1365-2249.1992.tb05873.xsubject
Has Abstractpub_date
1992-12-01 00:00:00pages
497-502issue
3eissn
0009-9104issn
1365-2249journal_volume
90pub_type
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