Plasmodium sporozoite excystation involves local breakdown of the oocyst capsule.

Plasmodium sporozoite excystation involves local breakdown of the oocyst capsule.
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疟原虫子孢子脱囊涉及卵囊被膜的局部破裂。

DOI:
10.1038/s41598-023-49442-1
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发表时间:
2023-12-14
期刊:
影响因子:
4.6
通讯作者:
Dessens, Johannes
Dessens, Johannes
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Saeed, Sadia;Tremp, Annie;Dessens, Johannes

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疟原虫卵囊发育在蚊子中肠的近腔侧,数量相对较少。卵囊拥有一层细胞外的细胞壁--被膜--来保护它们免受昆虫血淋巴环境的伤害。为了进一步最大化传播,每个卵囊通过称为孢子生殖的无性繁殖步骤产生数百个子孢子。传播的完成需要子孢子从包囊中排出(脱囊),但这一过程仍然知之甚少。在这项研究中,我们融合了寄生虫编码的胶囊蛋白Cap 380与绿色荧光蛋白的转基因伯氏疟原虫系,允许活的荧光成像胶囊整个孢子生殖和子孢子脱囊。结果表明,孢子囊在孢子形成过程中逐渐变弱,最终导致子孢子通过小孔排出。在形成孔之前,观察到囊的局部变薄。我们的研究结果支持一个excystation模型的基础上,当地的,而不是全球的,削弱胶囊可能促进当地重新定位的子孢子和顶端分泌。
Plasmodium oocysts develop on the abluminal side of the mosquito midgut in relatively small numbers. Oocysts possess an extracellular cell wall—the capsule—to protect them from the insect's haemolymph environment. To further maximise transmission, each oocyst generates hundreds of sporozoites through an asexual multiplication step called sporogony. Completion of transmission requires sporozoite egress from the capsule (excystation), but this process remains poorly understood. In this study, we fused the parasite-encoded capsule protein Cap380 with green fluorescent protein in a transgenic P. berghei line, allowing live fluorescence imaging of capsules throughout sporogony and sporozoite excystation. The results show that capsules progressively weaken during sporulation ultimately resulting in sporozoite exit through small holes. Prior to formation of the holes, local thinning of the capsule was observed. Our findings support an excystation model based on local, rather than global, weakening of the capsule likely facilitated by local re-orientation of sporozoites and apical secretion.
DOI: 10.1186/s13071-021-04868-2
发表时间: 2021-07-21
影响因子: 3.2
作者:
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Bersodium Berghei Cap93是一种新型的卵囊相关蛋白,在孢子岩发育中起作用。
DOI: 10.1186/s13071-017-2337-8
发表时间: 2017-08-25
影响因子: 3.2
作者:
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DOI: 10.1007/s00436-014-4093-4
发表时间: 2014-11
影响因子: 2
作者:
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