Morphological and functional characterization of a novel Na+/K+-ATPase-immunoreactive, follicle-like structure on the gill septum of Japanese banded houndshark, Triakis scyllium

Cell and Tissue Research
Souichirou TakabeSusumu Hyodo

Abstract

In teleost fishes, it is well-established that the gill serves as an important ionoregulatory organ in addition to its primary function of respiratory gas exchange. In elasmobranch fish, however, the ionoregulatory function of the gills is still poorly understood. Although mitochondria-rich (MR) cells have also been found in elasmobranch fish, these cells are considered to function primarily in acid-base regulation. In this study, we found a novel aggregate structure made up of cells with basolaterally-expressed Na(+)/K(+)-ATPase (NKA), in addition to NKA-immunoreactive MR cells that have already been described in the gill filament and lamella. The cell aggregates, named follicularly-arranged NKA-rich cells (follicular NRCs), were found exclusively in the epithelial lining of the venous web in the cavernous region of the filament and the inter-filamental space of the gill septum. The follicular NRCs form a single-layered follicular structure with a large lumen leading to the external environment. The follicular NRCs were characterized by: (i) well-developed microvilli on the apical membrane, (ii) less prominent infoldings of the basolateral membrane and (iii) typical junction structures including deep tight junction between cel...Continue Reading

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Citations

Mar 15, 2013·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Shanshan LiShigehisa Hirose
Sep 1, 2015·General and Comparative Endocrinology·Yoko YamaguchiSusumu Hyodo
Apr 5, 2016·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Souichirou TakabeSusumu Hyodo
Aug 21, 2016·Cell and Tissue Research·Melissa S CameronJohn A Donald
Jun 13, 2020·The Journal of Experimental Biology·Yuki HondaSusumu Hyodo
Apr 29, 2016·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Kumi HasegawaSusumu Hyodo
Oct 24, 2014·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Susumu HyodoYoko Yamaguchi

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