[Membrane transport system of amino acids in the small intestine].
The membrane transport system of amino acids in the small intestine is reviewed. Amino acids are transported by three processes: 1) simple diffusion, 2) facilitated diffusion and 3) active transport. In the brush border membrane, there are at least six Na(+)-dependent systems (NBB, PHE, IMINO, beta, X-G,A, Y+) and the Na(+)-independent systems (L, beta, Y+). On the other hand, the basolateral membrane has at least four Na(+)-dependent systems (A, ASC, X-G,A, N) and three Na(+)-independent systems (asc, L, y+). These systems are discussed.
Nakamura
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3rd Department of Internal Medicine, Teikyo University School of Medicine, Ichihara Hospital.
D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D001485:Basement Membrane / Q000378:metabolism; D001692:Biological Transport; D004058:Diffusion; D007421:Intestine, Small / Q000378:metabolism*; D008871:Microvilli / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism / Q000502:physiology
D000596:Amino Acids; D012964:Sodium