20.500.12556/DiRROS-13465 Comparative ultrastructure of cells and cuticle in the anterior chamber and papillate region of Porcellio scaber (Crustacea, Isopoda) hindgut Isopod hindgut consists of two anatomical and functional parts, the anterior chamber, and the papillate region. This study provides a detailed ultrastructural comparison of epithelial cells in the anterior chamber and the papillate region with focus on cuticle ultrastructure, apical and basal plasma membrane labyrinths, and cell junctions. Na+/K+-ATPase activity in the hindgut epithelial cells was demonstrated by cytochemical localisation. The main difference in cuticle ultrastructure is in the thickness of epicuticle which is almost as thick as the procuticle in the papillate region and only about one sixth of the thickness of procuticle in the anterior chamber. The apical plasma membrane in both hindgut regions forms an apical plasma membrane labyrinth of cytoplasmic strands and extracellular spaces. In the papillate region the membranous infoldings are deeper and the extracellular spaces are wider. The basal plasma membrane is extensively infolded and associated with numerous mitochondria in the papillate region, while it forms relatively scarce basal infoldings in the anterior chamber. The junctional complex in both hindgut regions consists of adherens and septate junctions. Septate junctions are more extensive in the papillate region. Na+/K+-ATPase was located mostly in the apical plasma membranes in both hindgut regions. The ultrastructural features of hindgut cuticle are discussed in comparison to exoskeletal cuticle and to cuticles of other arthropod transporting epithelia from the perspective of their mechanical properties and permeability. The morphology of apical and basal plasma membranes and localisation of Na+/K+-ATPase are compared with other arthropod-transporting epithelia according to different functions of the anterior chamber and the papillate region. cell junctions digestive system extracellular matrix ion transporting epithelium plasma membrane labyrinth true false true Angleški jezik Angleški jezik Članek v reviji 2020-12-21 08:06:40 2024-07-24 13:54:52 2024-07-25 04:14:44 0000-00-00 00:00:00 2018 0 0 str. 427-458 Vol. 801 2018 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2018-12-03 1313-2989 576 10.3897/zookeys.801.22395 4911695 517960729 https://doi.org/10.3897/zookeys.801.22395 1 https://dirros.openscience.si/Dokument.php?lang=slv&id=16447 RAZ_Bogataj_Urban_2018.pdf RAZ_Bogataj_Urban_2018.pdf 1 897476AC97780EA247530F02545DDE5E 7416e389bfa493307c5730f4fe2d8eae99763dcce12935f342e6b8cafe94baa4 5ebc77df-49a3-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=27338 Nacionalni inštitut za biologijo 0 0 0