首页> 外文期刊>Infection and immunity >Comparison of irradiated-cercaria schistosome vaccine models that use 15- and 50-kilorad doses: the 15-kilorad dose gives greater protection, smaller liver sizes, and higher gamma interferon levels after challenge.
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Comparison of irradiated-cercaria schistosome vaccine models that use 15- and 50-kilorad doses: the 15-kilorad dose gives greater protection, smaller liver sizes, and higher gamma interferon levels after challenge.

机译:使用15和50公斤剂量的辐射尾cer血吸虫疫苗模型的比较:攻击后15公斤剂量可提供更好的保护,更小的肝脏大小和更高的γ干扰素水平。

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The protection and immune response to infection caused by the parasite Schistosoma mansoni were studied by comparison of two murine irradiated-vaccine models. Mice were exposed from 1 to 4 times to infective-stage cercariae attenuated with either a moderate dose (15 kilorads) or a high dose (50 kilorads) of radiation. Seven weeks after challenge infection, the mice were assessed for resistance, liver size, and lymphokine responses to parasite antigens. Both vaccine models showed high levels of protection, but the moderate-dose model proved superior in that mice in those groups achieved higher levels of resistance in fewer exposures. Additionally, the mice exposed three times and four times to moderately irradiated cercariae all had significantly lower liver weights independent of worm burden. Assessment of lymphokine production by the spleen cells at the time of perfusion showed that gamma interferon was the only lymphokine of those measured that was differentially produced in the two models and correlated with a decrease in size of in vitro granulomas. The findings suggest that a selected vaccine regimen may lead to greater resistance and decreased liver pathology, the latter of which appears to be mediated by induction of gamma interferon.
机译:通过比较两种小鼠辐照疫苗模型研究了由曼氏血吸虫寄生虫引起的感染的保护和免疫反应。将小鼠暴露于感染期尾c的1至4次,使其受到中等剂量(15千拉德)或高剂量(50千拉德)的辐射衰减。攻击感染后七周,评估小鼠的抵抗力,肝脏大小和对寄生虫抗原的淋巴因子应答。两种疫苗模型均显示出高水平的保护作用,但中等剂量模型被证明具有优越性,因为这些组中的小鼠以较少的暴露量获得了较高的抗性水平。此外,与中线照射的尾c接触3次和4次的小鼠均具有明显较低的肝脏重量,而与蠕虫负担无关。灌注时脾细胞对淋巴因子产生的评估表明,在两种模型中,γ干扰素是所测得的唯一淋巴因子,在两种模型中产生的淋巴因子不同,并且与体外肉芽肿大小的减少有关。研究结果表明,选定的疫苗接种方案可能会导致更高的耐药性并降低肝脏病理,后者似乎是由γ干扰素的诱导介导的。

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