| Project/Area Number |
04557003
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
General physiology
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| Research Institution | National Institute for Physiological Sciences |
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Principal Investigator |
OKADA Yasunobu National Institute for Physiological Sciences, Professor, 生理学研究所, 教授 (10025661)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥10,200,000 (Direct Cost: ¥10,200,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1993: ¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1992: ¥5,000,000 (Direct Cost: ¥5,000,000)
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| Keywords | epithelial polarity / small intestine / crypt / villus / secretion / absorption / patch-clamp / ion channel / 極性 |
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| Research Abstract |
The epithelial cells of the mammalian small intestine partakes in both secretion of Cl-and absorption of Na+as well as organic solutes.It is generally thought that the intestinal secretion is carried out by the crypt epithelial cell whereas the absorption is by the villus epithelial cell. However, little direct level evidence has been provided for the hypothesis. To directly examine the hypothesis at the single cell level, we had started experiments using single villus epithelial cells isolated from the guinea pig small intestine.The brush-border structure of singly isolated enterocytes, however, became rapidly lost, and therefore no glucose-dependent ionic currents could be recorded from them by the patch-clamp technique. The present study is aimed at developing the method to prepare the villus and crypt specimen with the intact epithelial polarity from the small intestine of the adult guinea pig. The preparations could be separately obtained by isolating the epithelia after vibration in the EDTA-containing saline solution and by slicing the tissue. By applying the patch-clamp technique, numbers of ionic currents could be recorded from these isolated epithelia, especially glucose-dependent ionic currents from isolated villi and cyclic AMP-activated (CFTR-typed)Cl-channel currents from isolated crypts.
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