Programa de Pós-graduação em Biologia Celular e Estrutural, Universidade Federal do Viçosa, Brazil.
C R Biol. 2010 May;333(5):405-15. doi: 10.1016/j.crvi.2010.02.001. Epub 2010 Mar 27.
Triatoma vitticeps (Stal, 1859) is a hematophagous Hemiptera that, although being considered wild, can be found in households, being a potential Chagas' disease vector. This work describes the histology and ultrastructure of the midgut of T. vitticeps under different starvation periods. Fifteen adults of both sexes starved for 3, 7, 20 and 25 days were studied. In general, digestive cells had apical microvilli, basal plasma membrane infoldings and central nucleus. The perimicrovillar membrane was found in all insects examined. Digestive cells of anterior midgut had lipid droplets, glycogen granules, developed basal labyrinth associated with mitochondria suggesting their role in nutrient storage and in fluid and ion transport. The cells of median and posterior regions of the midgut were rich in rough endoplasmic reticulum, lysosomes, vesicles and granules with different electron-densities. Moreover, cells of the posterior portion of the midgut had hemozoyn granules and mitochondria in the apical cytoplasm close to microvilli, suggesting their role in blood digestion and active nutrient absorption. The midgut of T. vitticeps showed differences in digestive cells associated with the time after feeding, and the increase of vesicles amount in long starvation periods, which suggests enzyme storage, which is readily used after a blood meal.
吸血的半翅目 Triatoma vitticeps（Stal，1859）虽然被认为是野生的，但也可以在家庭中找到，是潜在的克氏锥虫病传播媒介。本研究描述了不同饥饿期 T. vitticeps 中肠的组织学和超微结构。研究了 15 只雌雄两性饥饿 3、7、20 和 25 天的成虫。一般来说，消化细胞具有顶微绒毛、基底质膜内陷和中央核。所有检查的昆虫中都发现了周缘微绒毛膜。前中肠的消化细胞具有脂滴、糖原颗粒、与线粒体相关的发达基底迷宫，表明它们在营养物质储存以及在液体和离子运输中起作用。中肠和后肠区域的细胞富含粗糙内质网、溶酶体、囊泡和具有不同电子密度的颗粒。此外，中肠后段的细胞具有血晶蛋白颗粒和靠近微绒毛的顶细胞质中的线粒体，表明它们在血液消化和主动营养吸收中的作用。T. vitticeps 的中肠显示出与进食后时间相关的消化细胞的差异，以及在长时间饥饿期囊泡数量的增加，这表明酶的储存，在进食血液后可以迅速利用。
