Spatiotemporal expression of activin receptor-like kinase-5 and bone morphogenetic protein receptor type II in the ovary of shortfinned eel, Anguilla australis.

Autor: Falahati A; Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand. Electronic address: ali.falahati@yazd.ac.ir., Ozaki Y; Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand; National Research Institute of Aquaculture, Japan Fisheries Research and Education Agency, 224-1 Hiruta, Tamaki, Watarai, Mie 519-0423, Japan., Damsteegt EL; Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand., Zadmajid V; Department of Fisheries Science, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran., Freeman KJ; Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand., Lokman PM; Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand.
Jazyk: angličtina
Zdroj: Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology [Comp Biochem Physiol B Biochem Mol Biol] 2021 Jan; Vol. 251, pp. 110509. Date of Electronic Publication: 2020 Sep 28.
DOI: 10.1016/j.cbpb.2020.110509
Abstrakt: In the eel ovary, the expression of growth differentiation factor-9 (Gdf9) appears to be largely confined to the germ cell in early stages of oogenesis. However, both the target tissue and the function of Gdf9 in fish remain unknown. This study aimed to describe the abundance and localization of activin receptor-like kinase-5 (Alk5) and bone morphogenetic protein receptor type II (Bmpr2), which together mediate the Gdf9 signal, in the ovary of a basal teleost, the shortfinned eel, Anguilla australis, during early folliculogenesis. The cDNA encoding eel alk5 and bmpr2 genes were cloned, characterized and the transcript abundances of these receptors quantified by quantitative real-time PCR. Ovarian transcript abundance for both receptors, along with that of gdf9 and of its paralogue bmp15, increased from the previtellogenic to early vitellogenic stage. Localization of receptor mRNAs by in situ hybridization revealed that these receptors are located in the somatic cells surrounding the oocyte. Furthermore, tissue distribution analysis showed that the expression of alk5 and bmpr2 were highest in ovary and thyroid, respectively. Unexpectedly, however, bmpr2 mRNA levels were lower in the ovary than in any of the other 17 tissues examined, and indeed, lower than ovarian gdf9 transcript abundance. These findings, together with the ovarian expression pattern of Gdf9, suggest that Gdf9, and conceivably, Bmp15, from the oocyte can signal through receptors that are located on the somatic cells surrounding the oocyte; this, in turn, facilitates elucidation of the function of these growth factors during oogenesis in teleost fish.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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