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Insights into myxozoan composition and physiology revealed by histochemical properties of myxospores.
Journal of Fish Diseases ( IF 2.2 ) Pub Date : 2020-03-23 , DOI: 10.1111/jfd.13152
Justin M Stilwell 1 , Matt J Griffin 2 , Thomas G Rosser 3 , Haitham H Mohammed 4 , Inga F Sidor 5 , Alvin C Camus 1
Affiliation  

Myxozoa (phylum Cnidaria) are a diverse group of metazoan parasites that predominately infect fish. Little is known regarding the composition and physiology of their myxospore life stage. The objective of this work was to investigate the composition of myxospores and extrasporogonic stages of nine myxozoan species infecting various teleost fish using histochemical staining techniques. Thirty histochemical stains were applied to formalin-fixed, paraffin-embedded tissues processed routinely for light microscopic evaluation. The polar capsules were the most consistent stain target across the taxa examined. Polar capsule staining with Alizarin red, von Kossa and methyl green-pyronin suggests the presence of intracapsular calcium and phosphate, which may contribute to polar filament discharge or pathogenesis of host invasion. The shell valves and suture lines of most myxozoans were stained with Luna and phosphotungstic acid haematoxylin stains, consistent with the presence of chitin and microfibrils, respectively. Vacuoles were consistently highlighted by diastase-susceptible periodic acid-Schiff and Grocott's methenamine silver staining, indicating glycogen. Other histochemical stains exhibited inconsistent staining across the taxa, suggesting differences in myxospore composition potentially reflective of physiologic variations and tissue tropisms. This work provides some information on conserved features and taxa-associated composition of myxospores and lends insight into myxozoan physiology and host-parasite interactions.

中文翻译:

粘孢子的组织化学性质揭示了对粘虫的组成和生理的了解。

粘虫(Cydaria)是一种主要感染鱼类的后生寄生虫。关于其粘孢子生活阶段的组成和生理机制知之甚少。这项工作的目的是使用组织化学染色技术研究感染多种硬骨鱼的九种粘虫动物的粘孢子的组成和孢子外阶段。将三十种组织化学染色剂应用于福尔马林固定,石蜡包埋的组织,并进行常规处理以进行光学显微镜评估。极性胶囊是整个检查的类群中最一致的染色目标。极地荚膜用茜素红,von Kossa和甲基绿pyronin染色表明囊内钙和磷酸盐的存在,这可能有助于极丝放电或宿主入侵的发病机理。大多数粘虫类动物的壳瓣和缝合线均用Luna和磷钨酸苏木精染色,分别与几丁质和微原纤维的存在一致。淀粉酶敏感的高碘酸-席夫氏和格罗科特的甲基苯二胺银染始终突出显示液泡,表明糖原。其他组织化学染色在整个分类单元上显示不一致的染色,表明粘孢子组成的差异可能反映了生理变化和组织嗜性。这项工作提供了有关粘孢子的保守特征和与分类单元相关的组成的一些信息,并有助于深入了解粘虫的生理和宿主-寄生虫的相互作用。分别与几丁质和微纤维的存在一致。淀粉酶敏感的高碘酸-席夫氏和格罗科特的甲基苯二胺银染始终突出显示液泡,表明糖原。其他组织化学染色在整个分类单元上显示不一致的染色,表明粘孢子组成的差异可能反映了生理变化和组织嗜性。这项工作提供了有关粘孢子的保守特征和与分类单元相关的组成的一些信息,并有助于深入了解粘虫的生理和宿主-寄生虫的相互作用。分别与几丁质和微纤维的存在一致。淀粉酶敏感的高碘酸-席夫氏和格罗科特的甲基苯二胺银染始终突出显示液泡,表明糖原。其他组织化学染色在整个分类单元上显示不一致的染色,表明粘孢子组成的差异可能反映了生理变化和组织嗜性。这项工作提供了有关粘孢子的保守特征和与分类单元相关的组成的一些信息,并有助于深入了解粘虫的生理和宿主-寄生虫的相互作用。提示粘孢子组成的差异可能反映了生理变化和组织嗜性。这项工作提供了有关粘孢子的保守特征和与分类单元相关的组成的一些信息,并有助于深入了解粘虫的生理和宿主-寄生虫的相互作用。提示粘孢子组成的差异可能反映了生理变化和组织嗜性。这项工作提供了有关粘孢子的保守特征和与分类单元相关的组成的一些信息,并有助于深入了解粘虫的生理和宿主-寄生虫的相互作用。
更新日期:2020-03-23
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