Role of nitric oxide in depressed lymphoproliferative responses and altered cytokine production following thermal injury in rats

被引:28
作者
Masson, I [1 ]
Mathieu, J
Nolland, XB
De Sousa, M
Chanaud, B
Strzalko, S
Chancerelle, Y
Kergonou, JF
Giroud, JP
Florentin, I
机构
[1] Hop Cochin, Dept Pharmacol, CNRS, URA 1534, F-75679 Paris 14, France
[2] Serv Sante Armees, Ctr Rech, Unit Radiobiochim, F-38702 La Tronche, France
关键词
D O I
10.1006/cimm.1998.1296
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Immunodeficiency follows extensive burns. We investigated some underlying mechanisms in rats, 10 days after a full-thickness skin burn affecting 20% of total body surface area. In both normal and burned rats the splenocyte proliferative response to Con A was linearly and negatively correlated with nitric oxide (NO) production. In all burned rats, the proliferative response was depressed by more than 80% and NO production corresponded to a nitrite concentration above 20 mu M. Proliferative responses in burned rats were fully restored in the presence of 250 mu M N-G-monomethyl-L-arginine (NMMA). A time course study of NO production in response to Con A, LPS, anti-CD3, and IFN-gamma showed that splenic macrophages from burned rats responded to direct and indirect stimuli more rapidly and more intensively than normal macrophages, In the second part of this work, the effect of the overproduction of NO on the synthesis of immunoregulatory and proinflammatory cytokines was investigated, Although it was inhibited, IFN-gamma production by splenocytes from burned rats remained sufficient for NO synthase induction and was restored by NMMA. Concomitantly, IL-2 concentration was enhanced but returned to normal in the presence of NMMA. TNF production was halved after burn injury and NMMA partially restored it. In contrast, IL-6 production was enhanced and increased further in the presence of NMMA. Therefore, cytokines were differently affected by burn injury and variously regulated by NO. (C) 1998 Academic Press.
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页码:121 / 132
页数:12
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