Effects of high-glucose and high-fat diets on concanavalin A binding to rat liver plasma membranes and on the amount and pattern of their glycoprotein carbohydrates.
Purified liver plasma membranes were prepared from rats fed a high-fat, carbohydrate-free diet or a high-glucose, fat-free diet. Membranes from rats fed the high-fat diet bound significantly less 125I-labeled concanavalin A (Con A) than did those from rats fed the fat-free diets. The magnitude of the binding difference increased with increasing concentrations of Con A. Neither association nor dissociation rates of the lectin-receptor complex was affected by diet. The extent of degradation of Con A by liver plasma membrane preparations from rats fed either diet was the same. Chemical analysis of delipidated liver plasma membrane showed that membranes prepared from high-fat diet-adapted rats had significantly lower values for all carbohydrate components measured with the exception of galactose. The results indicate that, in liver cells, a change in plasma membrane glycoproteins is part of the complex adaptation to altered diet composition.
D000818:Animals; D002462:Cell Membrane / Q000378:metabolism; D003208:Concanavalin A / Q000378:metabolism*; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004041:Dietary Fats / Q000008:administration & dosage*; D005947:Glucose / Q000494:pharmacology*; D006023:Glycoproteins / Q000378:metabolism*; D006595:Hexosamines / Q000378:metabolism; D006601:Hexoses / Q000378:metabolism; D008099:Liver / Q000378:metabolism*; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism; D051381:Rats; D011952:Receptors, Concanavalin A / Q000378:metabolism; D012794:Sialic Acids / Q000378:metabolism
D004040:Dietary Carbohydrates; D004041:Dietary Fats; D006023:Glycoproteins; D006595:Hexosamines; D006601:Hexoses; D008565:Membrane Proteins; D011952:Receptors, Concanavalin A; D012794:Sialic Acids; D003208:Concanavalin A; D005947:Glucose