首页> 外文期刊>Infection and immunity >Sera from chronic Chagasic patients and rodents infected with Trypanosoma cruzi inhibit trans-sialidase by recognizing its amino-terminal and catalytic domain.
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Sera from chronic Chagasic patients and rodents infected with Trypanosoma cruzi inhibit trans-sialidase by recognizing its amino-terminal and catalytic domain.

机译:来自慢性恰加斯病患者的血清和感染克鲁斯锥虫的啮齿动物通过识别其氨基末端和催化结构域来抑制反唾液酸酶。

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We investigated whether sera from chronic Chagasic patients and animals infected with Trypanosoma cruzi inhibit the removal of sialic acid from human erythrocytes and the transfer of sialic acid from sialyllactose to [14C]lactose in the reactions catalyzed by the parasite trans-sialidase. Sera from Swiss mice and Calomys callosus animals infected with three different T. cruzi strains inhibit both reactions. Inhibition increases during the infection, reaching maximal levels when the parasitemia decreases. Among 44 sera of untreated chronic Chagasic patients, 40 inhibit both reactions. Inhibition is observed with total, defatted sera or with purified immunoglobulins. Whereas most of the inhibitory antibodies from Chagasic patients react with the papain fragment of trans-sialidase in immunoblots, a few patients have noninhibitory antibodies that react only with the entire trans-sialidase. These findings may be relevant for the pathology of Chagas' disease.
机译:我们调查了来自慢性恰加斯病患者和感染克鲁斯锥虫的动物的血清是否在寄生虫反唾液酸唾液酸酶催化的反应中,抑制了唾液酸从人红细胞中的清除以及唾液酸从唾液乳糖到[14C]乳糖的转移。来自瑞士小鼠和Calomys愈伤组织动物的血清感染了三种不同的克氏锥虫菌株,可抑制两种反应。在感染过程中抑制作用增加,当寄生虫血症减少时达到最高水平。在未经治疗的慢性Chagasic患者的44份血清中,有40份抑制两种反应。用总的脱脂血清或纯化的免疫球蛋白可观察到抑制作用。尽管来自Chagasic患者的大多数抑制性抗体在免疫印迹中均与反唾液酸酶的木瓜蛋白酶片段反应,但少数患者的非抑制性抗体仅与整个反唾液酸酶反应。这些发现可能与恰加斯氏病的病理相关。

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