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- W1588032844 abstract "High and low affinity binding sites for tetrodotoxin have been found in rat skeletal muscle cells in vitro using a radiolabeled tetrodotoxin derivative and 22Na+ flux studies. High affinity binding sites for tetrodotoxin (KD(tetrodotoxin) = 1.6 nM) cannot be detected at the myoblast stage. They appear and increase in density as myoblasts fuse into myotubes to reach a maximum binding capacity of 50 fmol/mg of proteins. Na+ channel structures with a high affinity for tetrodotoxin cannot be activated by neurotoxins specific for the Na+ channel such as veratridine and sea anemone toxinII. They are not expressed in the action potential. Na+ channels with a low affinity for tetrodotoxin (IC50(tetrodotoxin) = 1 microM) are functional since they can be activated by veratridine and sea anemone toxinII. They are already expressed in myoblasts and their density is not modified during the fusion of myoblasts into myotubes; they remain functional throughout the differentiation process. It is suggested that neuronal factors are not required for the synthesis of structures with high affinity binding sites for tetrodotoxin in the rat muscle and that they are only involved for the maturation of these structures from a nonfunctional to a functional form." @default.
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- W1588032844 date "1983-06-01" @default.
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- W1588032844 title "Na+ channels with high and low affinity tetrodotoxin binding sites in the mammalian skeletal muscle cell. Difference in functional properties and sequential appearance during rat skeletal myogenesis." @default.
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- W1588032844 doi "https://doi.org/10.1016/s0021-9258(18)32167-7" @default.
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