Abstract
Precise localization and characterization of conductance pathways in glandular epithelia have so far proved difficult1. The patch-clamp technique for high resolution current recording2–4, which has already been applied successfully to a number of electrically excitable cells3,4, can in principle overcome these difficulties. We now report measurements of single-channel currents from isolated patches of plasma membrane (inside-out) from the baso-lateral surface of collagenase-isolated rat and mouse pancreatic acini. We have identified a cation channel having a conductance of ∼30 pS and a mean open time in the range 0.3–1 s which is dependent on internal calcium. The single-channel current–voltage relationship is linear and the mean open time independent of the membrane potential. These channels may, at least in part, account for the Ca2+-mediated neural and hormonal control of pancreatic acinar membrane conductance, which is probably responsible for the Ca2+-dependent acinar fluid secretion5–7.
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References
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Maruyama, Y., Petersen, O. Single-channel currents in isolated patches of plasma membrane from basal surface of pancreatic acini. Nature 299, 159–161 (1982). https://doi.org/10.1038/299159a0
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DOI: https://doi.org/10.1038/299159a0
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