Study on the effect of a high fat diet on diaphragm and liver glycogen and glycerides in the rat.
The present work was undertaken to study the effect of nutritional obesity induced by a high fat diet on the consumption of glycogen and glycerides in rat liver and diaphragm. Groups of rats were fed for five weeks from weaning either a fat-rich-carbohydrate (CHO)-poor diet, or a CHO-rich-fat-poor diet. Basal plasma glucose and free fatty acids (FFA) were significantly increased in the animals adapted to the fat-rich diet. Half of the rats were submitted to a 48-h fast. After fast, basal plasma glucose and immunoreactive insulin (IRI) fell significantly, whereas plasma FFA levels were higher than in the group fed the CHO-rich-fat-poor diet. In the liver, glycogen concentration fell in both groups after fast, with a glycogen breakdown of 1930 +/- 244 mumole glycogen glucose/liver in the fat-fed group vs 4636 +/- 216 mumole/liver in the CHO-fed group. Glycerides fell by 750 +/- 68 mumole glyceride glycerol/liver in the fat-fed rats while remaining unchanged (increased by 82 +/- 57 mumole/liver) in the CHO-fed group. In the diaphragm glycogen concentration also fell in both groups, with a glycogen breakdown of 6.0 +/- 0.3 mumole glycogen glucose/g wet tissue in the fat-fed rats vs 15.2 +/- 1.4 mumole/g wet tissue in the CHO-fed animals. Glycerides fell by 23.1 +/- 4.0 mumole/g wet diaphragm in the CHO-fed animals. The lower breakdown of glycogen in both liver and diaphragm of fat-fed rats demonstrates a decreased utilization of glycogen during fast, with energy consumption originating in larger part from triglycerides.(ABSTRACT TRUNCATED AT 250 WORDS)
D000818:Animals; D001835:Body Weight / Q000187:drug effects; D003964:Diaphragm / Q000378:metabolism; D004040:Dietary Carbohydrates / Q000378:metabolism; D004041:Dietary Fats / Q000494:pharmacology*; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005989:Glycerides / Q000378:metabolism*; D007328:Insulin / Q000097:blood; D008112:Liver Glycogen / Q000378:metabolism*; D009132:Muscles / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
D004040:Dietary Carbohydrates; D004041:Dietary Fats; D005230:Fatty Acids, Nonesterified; D005989:Glycerides; D007328:Insulin; D008112:Liver Glycogen