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Neurochem Res
2004 Jan 01;291:9-15. doi: 10.1023/b:nere.0000010431.26708.61.
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The anion exchanger as an osmolyte channel in the skate erythrocyte.
Perlman DF
,
Goldstein L
.
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Regulatory volume decrease occurs in fish erythrocytes by the release of osmolytes via a channel involving the anion exchanger (AE), also known as band 3. This review focuses primarily on work done on red blood cells from the skate (Raja erinacea) to further understand the activation, regulation and identification of this osmolyte channel. A model is proposed in which the reduction in intracellular ionic strength that occurs with increased cell volume may change the interaction between AE dimers and other cytoplasmic proteins (band 4.1 and ankyrin), promoting the formation of a tetrameric osmolyte channel. Phosphorylation by two tyrosine kinases, p72syk and p56lyn, is linked to this oligomerization. The skate AE has been recently cloned, resulting in three different isoforms, one of which, skAE1, when expressed in Xenopus oocytes, demonstrates taurine transport.
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