Continuous in vitro cultivation of a recently identified Babesia that infects small ruminants in China

文献类型： 外文期刊

第一作者： Guan, Guiquan

作者： Guan, Guiquan;Ma, Miling;Liu, Aihong;Du, Pengfei;Ren, Qiaoyun;Li, Youquan;Wang, Jinming;Liu, Zhijie;Yin, Hong;Luo, Jianxun

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关键词： Babesia sp Xinjiang;In vitro culture;Growth characteristics;Generation time;Host range

期刊名称：VETERINARY PARASITOLOGY （ 影响因子：2.738； 五年影响因子：2.951 ）

ISSN： 0304-4017

年卷期： 2012 年 187 卷 3-4 期

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收录情况： SCI

摘要： Babesia sp. Xinjiang was isolated from a splenectomised sheep infested by Rhipicephalus sanguineus and Hylomma anatolicum anatolicum, collected from sheep and cattle in Xinjiang province. It was considered to be a novel ovine Babesia species on the basis of its morphology, pathogenicity, vector tick species and alignments of 18S ribosomal RNA (18S rRNA) and internal transcribed spacers (ITS) gene sequences. Continuous in vitro cultures of the ovine parasite were established using infected sheep blood. In RPMI 1640 medium with 7.5% sheep red blood cells (RBCs) maintained in an incubator at 37 degrees C and 5% CO2, the percentage of parasitized erythrocytes (PPE) peaked at 10% in 24- and 6-well plates. It increased to 20-50% with the same culture medium but with 2.5% RBC in 75 cm(2) flasks. Two clonal lines of Babesia sp. Xinjiang were screened using the limiting dilution method. Growth characteristics of these lines in vitro were measured by a microtiter-based spectrophotometric method and from the PPE. The generation time in sheep erythrocytes was between 15.20 h and 16.27 h. Furthermore, the host range of parasite was identified with in vitro culture and in vivo infection. Erythrocytes of sheep, cattle, sika deer and humans could be invaded into by lines in vitro, but the parasites could not propagate in human erythrocytes. The parasites could not enter erythrocytes from goats in vitro. However, in vivo, only sheep could be infected by lines. Finally, a Babesia sp. Xinjiang-like parasite (which shared 99.5% identity with the original strain of Babesia sp. Xinjiang) was isolated using this in vitro culture system from 1 of 19 sheep blood samples collected from western Gansu province, China. (c) 2012 Elsevier B.V. All rights reserved.

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