FEBS Lett 2003 Feb 27;5371-3:151-6. doi: 10.1016/s0014-5793(03)00115-7.

Hypertonic activation of phospholemman in solitary rat hepatocytes in primary culture.

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Under hypertonic conditions, solitary rat hepatocytes in primary culture shrink and subsequently exhibit a distinct regulatory volume increase (RVI). Reverse-transcribed polymerase chain reaction and 5' and 3' RACE (rapid amplification of cDNA ends) techniques reveal that these cells express phospholemman (PLM). In whole-cell recordings, the hypertonic activation of a channel is observed that resembles PLM with respect to unitary conductance (600-700 pS), gating pattern, and non-selectivity for Na(+) over K(+). In Xenopus oocytes expressing hepatocyte PLM, hypertonic stress induces a non-selective cation conductance and noise analysis reveals the activation of a channel with a unitary conductance of approximately 700 pS. These results suggest a role of PLM in the RVI of rat hepatocytes.

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Species referenced: Xenopus laevis
Genes referenced: cyp26a1 fxyd1