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首页> 外文期刊>Journal of Parasitology >CELLULAR ASPECTS OF EARLY DEVELOPMENT OF ORNITHODIPLOSTOMUM PTYCHOCHEILUS METACERCARIAE IN THE BRAIN OF FATHEAD MINNOWS, PIMEPHALES PROMELAS
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CELLULAR ASPECTS OF EARLY DEVELOPMENT OF ORNITHODIPLOSTOMUM PTYCHOCHEILUS METACERCARIAE IN THE BRAIN OF FATHEAD MINNOWS, PIMEPHALES PROMELAS

机译：食人鱼NO虫脑中拟真线叶麦芽孢菌的早期发育的细胞方面

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摘要

Trematode metacercariae typically are regarded as nonfeeding and metabolically inactive. However, the metacercariae of many trematode species undergo complex and prolonged periods of development within their intermediate hosts. In the present study, we used electron microscopy to document chronological changes in development of the tegument of Ornithodiplostomum ptychocheilus metacercariae recovered from the brains of experimentally infected fathead minnows (Pimephales promelas). Commencing at 4 days postinfection (PI), the smooth, thin, syncytial tegument transforms into a complex microlamellar and microvillar system that encircles the entire body surface. The microvilli are oriented in parallel in an extended pattern, reaching directly away from the parasite and toward the receding host tissue. The microvilli disappear at approximately 28 days PI, followed by deposition of the cyst wall and further transformation of the tegument into the spinose, a glandular structure typical of an immature adult. To our knowledge, the progressive disaggregation of host cells at the leading edge of elongating parasite microvilli has not been demonstrated previously for any trematode. These results provide morphological evidence that the metacercariae of some trematode species undergo complex developmental changes associated with feeding in their intermediate host.
机译：吸虫性meta尾虫通常被认为是非进食的，并且代谢不活跃。然而，许多吸虫物种的the尾虫在其中间宿主中经历复杂且长期的发育。在本研究中，我们使用电子显微镜记录了从受实验感染的黑头min（Pimephales promelas）的大脑中回收到的拟小头孢霉的发展的时间变化。从感染后（PI）的第4天开始，光滑，稀薄，合胞体的外表会转变成围绕整个身体表面的复杂的微薄片和微绒毛系统。微绒毛以扩展模式平行定向，直接远离寄生虫并朝着后退的宿主组织延伸。微绒毛在PI约28天时消失，然后囊肿壁沉积，外皮进一步转化为棘突，这是不成熟成年人的典型腺体结构。据我们所知，以前没有针对任何吸虫证明宿主细胞在伸长的寄生虫微绒毛前沿逐渐分解。这些结果提供了形态学证据，表明某些吸虫物种的尾cer经历了与其中间宿主进食相关的复杂发育变化。

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    《Journal of Parasitology》 |2005年第4期|p.00000814-00000821|共8页
  • 作者

    Cameron P. Goater Douglas Bray David Bruce Conn*;

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    University of Lethbridge, Department of Biological Sciences, Lethbridge, Alberta T1K 3M4, Canada. cam.goater@uleth.ca*Department of Biology, Berry College, Mount Berry, Georgia 30149;

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