期刊
NATURE CELL BIOLOGY
卷 2, 期 10, 页码 695-702出版社
MACMILLAN PUBLISHERS LTD
DOI: 10.1038/35036318
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Ca2+-permeable channels that are involved in the responses of mammalian cells to changes in extracellular osmolarity have not been characterized at the molecular level. Here we identify a new TRP (transient receptor potential)-like channel protein, OTRPC4, that is expressed at high levels in the kidney, liver and heart. OTRPC4 forms Ca2+-permeable, nonselective cation channels that exhibit spontaneous activity in isotonic media and are vapidly activated by. in, extracellular osmolarity. Changes in osmolarity of as little as 10% result in significant changes in intracellular Ca2+ concentration. We propose that OTRPC4 is a candidate for a molecular sensor that confers osmosensitivity on mammalian cells.
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