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Renewal of Intestinal Stem Cells01:23

Renewal of Intestinal Stem Cells

The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the goblet,...
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Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
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重复阿斯卡里斯挑战通过胃细胞重编程来降低虫强度.

Yifan Wu1, Charlie Suarez-Reyes1, Nina L Tang1

  • 1Department of Pediatrics, Division of Tropical Medicine, Baylor College of Medicine, Houston, Texas, United States of America.

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概括

对圆虫 (Ascaris) 感染的重复暴露会导致胃细胞变化,从而减少虫负担. 这些变化可能解释了为什么人类的感染强度随着年龄的增长而下降.

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科学领域:

  • 寄生虫学的寄生虫学
  • 免疫学 免疫学 免疫学
  • 胃肠病学 胃肠病学

背景情况:

  • 虫病是一种广泛的寄生性线虫感染,在儿童中强度达到峰值,在成年人中下降.
  • 胃粘膜对于阿斯卡里斯幼虫化至关重要,利用酸性哺乳动物胆酶 (AMCase) 和胃酸.
  • 之前的研究表明,tamoxifen诱导的粘膜损伤损害了幼虫化和转位.

研究的目的:

  • 调查反复暴露于阿斯卡里斯菌对胃粘膜和感染强度的影响.
  • 了解阿斯卡里亚病感染强度年龄相关变化背后的机制.

主要方法:

  • 建立一个重复的Askaris suum挑战小鼠模型.
  • 评估胃粘膜中的细胞变化.
  • 在肝脏中的虫强度的量化.

主要成果:

  • 重复的阿斯卡里斯挑战诱导了胃粘膜中的细胞变化.
  • 这些胃部变化导致肝脏虫强度的减少.
  • 感染强度的减少独立于自适应性免疫反应.

结论:

  • 由于反复暴露于阿斯卡里斯的胃细胞变化,可以降低感染强度.
  • 这些发现表明,观察到的阿斯卡利亚症强度随年龄而下降的潜在机制.