RESUMO
Ischemic brain Stroke is associated with chronic inflammation and elevation of several cytokines such as Tumor Necrosis Factor alpha [TNF-alpha] and Interleukin [IL]-8 [IL-8] which are correlated with CNS injury and stroke.Chlamydia pneumoniae [CP] was suggested to be an independent riskfactor for stroke. Atherosclerosis may be a manifestation of chronic or persistent CP infection in the atherosclerotic plaque. To investigate the effect of live CP and chlamydial lipopolysaccharide [LPS] on the production of TNF-alpha and IL-8, and to study the levels of anti-CP IgG antibodies in the first acute ischemic stroke patients. Venous blood samples were collected in EDTA tubes from patients who had first time acute ischemic stroke [n=14] and from healthy subjects [controls] [n=14]. Leukocytes were isolated and cultured either non-stimulated or stimulated with chlamydial LPS and live CP. Intracellular cytokine production was detected by immunocytochemistry. Anti-CP IgG and IgA antibodies were detected by enzyme immunoassay [EIA]. The data showed significant increase of chlamydial stimulated and non-stimulated TNF-alpha and IL-8 production in patients compared to control [P<0.03]. There were a significant increase in anti-CP IgG antibodies in stroke patients compared to controls [P<0.0001]. The study concluded that pathological changes in acute brain stroke might be a consequence of CP infections that mediated induction of potential proinflammatory cytokines