首页> 外文期刊>Infection and immunity >Sera of patients with high titers of immunoglobulin G against Toxoplasma gondii induce secretion of tumor necrosis factor alpha by human monocytes.
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Sera of patients with high titers of immunoglobulin G against Toxoplasma gondii induce secretion of tumor necrosis factor alpha by human monocytes.

机译:高滴度抗弓形虫免疫球蛋白G的患者的血清可诱导人单核细胞分泌肿瘤坏死因子α。

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Toxoplasma gondii alone does not induce tumor necrosis factor alpha (TNF-alpha) secretion by human monocytes and macrophages. Nevertheless, sera from infected patients with high titers of specific immunoglobulin G antibodies against T. gondii induce TNF-alpha secretion, which is significantly higher than the corresponding induction by negative sera (P less than 0.05). After incubation with the positive serum, parasites also induce secretion of this cytokine, but TNF-alpha levels are lower (11.4 to 71.8%) than those obtained with positive serum alone. Therefore, this secretion seems to be elicited in part by antibody-T. gondii complexes and/or another unidentified factor(s), probably different from lipopolysaccharide, interleukin-1, TNF-alpha, and gamma interferon. In this study, monocytes secreted more TNF-alpha into the culture fluid than macrophages did (P less than 0.05), and no correlation was observed between secretion of this cytokine by the monocytes and the intracellular multiplication of the parasites, evaluated by [3H]uracil incorporation. Sera from patients with other infections diseases did not induce secretion of TNF-alpha; however, serum free of antibodies to T. gondii, obtained from patients with leishmaniosis, also stimulated secretion of the cytokine.
机译:单独的弓形虫不会诱导人单核细胞和巨噬细胞分泌肿瘤坏死因子α(TNF-alpha)。然而,来自高滴度抗弓形虫特异性免疫球蛋白G抗体的感染患者的血清可诱导TNF-α分泌,这显着高于相应的阴性血清诱导(P小于0.05)。与阳性血清一起温育后,寄生虫也诱导该细胞因子的分泌,但TNF-α水平比仅由阳性血清获得的TNF-α水平低(11.4%至71.8%)。因此,这种分泌似乎部分是由抗体-T引起的。刚地复合物和/或其他未知因素,可能与脂多糖,白介素-1,TNF-α和γ干扰素不同。在这项研究中,单核细胞向培养液中分泌的TNF-α比巨噬细胞分泌的多(P小于0.05),单核细胞分泌的这种细胞因子与寄生虫的细胞内增殖之间没有相关性,[3H]评估尿嘧啶合并。患有其他感染疾病的患者的血清未诱导TNF-α的分泌。然而,从利什曼病患者获得的不含弓形虫抗体的血清也刺激了细胞因子的分泌。

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