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. 1992 Apr 15;89(8):3635-8.
doi: 10.1073/pnas.89.8.3635.

Calcium uptake in the skin of a freshwater teleost

S D McCormick  1 , S Hasegawa, T Hirano
Affiliations

Calcium uptake in the skin of a freshwater teleost

S D McCormick et al. Proc Natl Acad Sci U S A. .

Abstract

The skin, particularly the opercular membrane of some teleosts, contains mitochondrion-rich "chloride" cells and has been widely used as a model to study branchial salt-extrusion mechanisms in seawater fish. Skin isolated from the operculum of the freshwater Nile tilapia (Oreochromis niloticus) can transport Ca2+ against an ionic and electrical gradient. Adaptation of Nile tilapia to a low-Ca2+ environment increased the capacity of the opercular membrane to transport Ca2+. The density of mitochondrion-rich cells increased in parallel with Ca2+ transport capacity. The results demonstrate net Ca2+ uptake by vertebrate skin and strongly implicate mitochondrion-rich cells as the site of Ca2+ uptake in fresh water.

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