caa a22 4500 445840846 CHVBK 20180317145343.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s00709-010-0186-9 doi (NATIONALLICENCE)springer-10.1007/s00709-010-0186-9 Ultrastructural changes of the midgut epithelium in Isohypsibius granulifer granulifer Thulin, 1928 (Tardigrada: Eutardigrada) during oogenesis [Elektronische Daten] [Magdalena Rost-Roszkowska, Izabela Poprawa, Maria Wójtowicz, Łukasz Kaczmarek] The midgut epithelium of Isohypsibius granulifer granulifer (Eutardigrada) is composed of columnar digestive cells. At its anterior end, a group of cells with cytoplasm which differs from the cytoplasm of digestive cells is present. Probably, those cells respond to crescent-like cells (midgut regenerative cells) described for some tardigrade species. Their mitotic divisions have not been observed. We analyzed the ultrastructure of midgut digestive cells in relation to five different stages of oogenesis (previtellogenesis, beginning of the vitellogenesis, vitellogenesis—early choriogenesis, vitellogenesis—middle choriogenesis, late choriogenesis). In the midgut epithelium cells, the gradual accumulation of glycogen granules, lipid droplets and structures of varying electron density occurs. During vitellogenesis and choriogenesis, in the cytoplasm of midgut cells we observed the increasing number of organelles which are responsible for the intensive synthesis of lipids, proteins and saccharides such as cisterns of endoplasmic reticulum and Golgi complexes. At the end of oogenesis, autophagy also intensifies in midgut epithelial cells, which is probably caused by the great amount of reserve material. Midgut epithelium of analyzed species takes part in the yolk precursor synthesis. Springer-Verlag, 2010 Epithelial cells nationallicence Midgut nationallicence Reserve material nationallicence Autophagy nationallicence Isohypsibius nationallicence Tardigrada nationallicence Rost-Roszkowska Magdalena Department of Animal Histology and Embryology, University of Silesia, Bankowa 9, 40-007, Katowice, Poland aut Poprawa Izabela Department of Animal Histology and Embryology, University of Silesia, Bankowa 9, 40-007, Katowice, Poland aut Wójtowicz Maria Department of Animal Histology and Embryology, University of Silesia, Bankowa 9, 40-007, Katowice, Poland aut Kaczmarek Łukasz Department of Animal Taxonomy and Ecology, A. Mickiewicz University, Umultowska 89, 61-614, Poznań, Poland aut Protoplasma Springer Vienna 248/2(2011-04-01), 405-414 0033-183X 248:2<405 2011 248 709 https://doi.org/10.1007/s00709-010-0186-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00709-010-0186-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rost-Roszkowska Magdalena Department of Animal Histology and Embryology, University of Silesia, Bankowa 9, 40-007, Katowice, Poland aut NATIONALLICENCE 700 1- Poprawa Izabela Department of Animal Histology and Embryology, University of Silesia, Bankowa 9, 40-007, Katowice, Poland aut NATIONALLICENCE 700 1- Wójtowicz Maria Department of Animal Histology and Embryology, University of Silesia, Bankowa 9, 40-007, Katowice, Poland aut NATIONALLICENCE 700 1- Kaczmarek Łukasz Department of Animal Taxonomy and Ecology, A. Mickiewicz University, Umultowska 89, 61-614, Poznań, Poland aut NATIONALLICENCE 773 0- Protoplasma Springer Vienna 248/2(2011-04-01), 405-414 0033-183X 248:2<405 2011 248 709 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer