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Expression of acetylcholine- and G protein coupled muscarinic receptor in the neuroepithelial cells (NECs) of the obligated air-breathing fish, arapaima gigas (arapaimatidae: teleostei)

Abstract: The air-breathing specialization has evolved idependently in vertebrates, as many different organs can perfom gas exchange. The largest obligate air-breathing fish from South America Arapaima gigas breathe air using its gas bladder, and its dependence on air breathing increases during its growth. During its development, gill morphology shows a dramatic change, remodeling with a gradual reduction of gill lamellae during the transition from water breathing to air breathing . It has been suggested that in this species the gills remain the main site of O2 and CO2 sensing. Consistent with this, we demonstrate for the first time the occurrence of the neuroepithelial cells (NECs) in the glottis, and in the gill filament epithelia and their distal halves. These cells contain a broader spectrum of neurotransmitters (5-HT, acetylcholine, nNOS), G-protein subunits and the muscarininic receptors that are coupled to G proteins (G-protein coupled receptors). We report also for the first time the presence of G alpha proteins coupled with muscarinic receptors on the NECs, that are thought as receptors that initiate the cardiorespiratory reflexes in aquatic vertebrates. Based on the specific orientation in the epithelia and their closest vicinity to efferent vasculatures, the gill and glottal NECs of A. gigas could be regarded as potential O2 and CO2 sensing receptors. However, future studies are needed to ascertain the neurophysiological characterization of these cells.

 Authorship: Zaccone G., Cupello C., Capillo G., Kuciel M., Nascimento A.L.R., Gopesh A., Germanà G.P., Spanò N., Guerrera M.C., Aragona M., Crupi R., Icardo J.M., Lauriano E.R.,

 Fuente: Zoology, 2020, 139, 125755

 Publisher: Elsevier

 Year of publication: 2020

 No. of pages: 18

 Publication type: Article

 DOI: 10.1016/j.zool.2020.125755

 ISSN: 0944-2006,1873-2720

 Publication Url: https://doi.org/10.1016/j.zool.2020.125755

Authorship

ZACCONE, GIACOMO

CUPELLO, CAMILA

CAPILLO, GIOELE

KUCIEL, MICHAL

NASCIMENTO, ANA L. R.

GOPESH, ANITA

GERMANÀ, GERMANA PATRIZIA

SPANÒ, NUNZIACARLA

GUERRERA, MARIA CRISTINA

ARAGONA, MARIALUISA

LAURIANO, EUGENIA RITA