Effect of anaerobiosis, dinitrophenol and fluoride on the active intestinal transport of galactose in snail.
The active transport of galactose across the intestinal wall (everted sacs) of the snail Cryptomphalus hortensis Müller has been studied in vitro, under several metabolic conditions. Anaerobiosis does not change the serosal/mucosal galactose gradients which are developed in oxygen atmosphere. Dinitrophenol (10(-4) M) greatly increased the O2 uptake by the tissue and clearly inhibits the sugar transport. At 5 times 10(-4) M concentration, DNP totally prevents the uphill transport while the O2 uptake is normal. The inhibition produced by DNP does not increase by anaerobiosis. Fluoride inhibits the galactose transport and also the O2 uptake. It is deduced that in snail intestine the energy for the active transport of galactose can be supplied by aerobic as much as by anaerobic metabolism. The inhibition by dinitrophenol seems to be independent of its uncoupling action on the oxidative phosphorylation. The inhibitory effect of NaF may be due both to glycolisis inhibition and to alteration of the digestive epithelium.
D000693:Anaerobiosis; D000818:Animals; D001693:Biological Transport, Active / Q000187:drug effects; D003864:Depression, Chemical; D004140:Dinitrophenols / Q000494:pharmacology*; D005459:Fluorides / Q000494:pharmacology*; D005690:Galactose / Q000378:metabolism*; D007408:Intestinal Absorption / Q000187:drug effects*; D007413:Intestinal Mucosa / Q000378:metabolism; D008660:Metabolism; D010101:Oxygen Consumption / Q000187:drug effects; D012908:Snails / Q000378:metabolism*
D004140:Dinitrophenols; D005459:Fluorides; D005690:Galactose