[Monosaccharide-dependent potassium ion influx across the microvilli membrane of the rat jejunum].
1. The condidtions were studied under which the Na+-dependently transported monosaccharides influence the K+-influx across the microvilli membrane of rat jejunum. 2. The Na+-dependent, energy requiring transport of monosaccharides causes a decrease of the K+-influx, whereas monosaccharides metabolizable by the intestinal mucosal cells - under suitable conditions - induce an increase in the K+-influx. 3. These results indicate that the K+-influx may be controlled by an energy dependent system in the microvilli membrane, which is influenced by metabolism and monosaccharide transport. It is discussed that this control system may be a (Na+ + K+)-ATPase.
D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D001692:Biological Transport; D002462:Cell Membrane / Q000378:metabolism; D066298:In Vitro Techniques; D007413:Intestinal Mucosa / Q000378:metabolism*; D007583:Jejunum / Q000166:cytology / Q000378:metabolism; D009005:Monosaccharides / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D051381:Rats; D012964:Sodium / Q000378:metabolism
D009005:Monosaccharides; D012964:Sodium; D000251:Adenosine Triphosphatases; D011188:Potassium
Monosaccharidabhängiger K+-Influx über die Mikrovillimembran des Jejunums der Ratte