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- W2003258291 abstract "In marine teleost fishes, the gill mitochondria-rich cells (MRCs) are responsible for NaCl elimination; however, in elasmobranch fishes, the specialized rectal gland is considered to be the most important site for salt secretion. The role of the gills in elasmobranch ion regulation, although clearly shown to be secondary, is not well characterized. In the present study, we investigated some morphological properties of the branchial MRCs and the localization, and activity of the important ionoregulatory enzyme Na+/K+-ATPase, under control conditions and following rectal gland removal (1 month) in the spiny dogfish, Squalus acanthias. A clear correlation can be made between MRC numbers and the levels of Na+/K+-ATPase activity in crude gill homogenates (r2=−0.69). Strong Na+/K+-ATPase immunoreactivity is also clearly associated with the basolateral membrane of these MRCs. In addition, the dogfish were able to maintain ionic balance after rectal gland removal. These results all suggest a possible role of the dogfish gill in salt secretion. MRCs were, however, unresponsive to rectal gland removal in terms of changes in number, fine structure and Na+/K+-ATPase activity, as might be expected if they were compensating for the loss of salt secretion by the rectal gland. Thus, the specific role that these MRCs play in ion regulation in the dogfish remains to be determined" @default.
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- W2003258291 date "2002-06-01" @default.
- W2003258291 modified "2023-10-09" @default.
- W2003258291 title "Branchial mitochondria-rich cells in the dogfish Squalus acanthias" @default.
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- W2003258291 doi "https://doi.org/10.1016/s1095-6433(02)00042-9" @default.
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