Search PubMed⌕ Search

Biomedical subjects

I Macdonald

Publications and source records attributed to I Macdonald.

At least 91 records · Page 5Linked to original sources
PubMed1977

The effect of glycerol and other intermediates on the incorporation of 14C-fructose and 14C-glucose to hepatic triglyceride.

Mature male rats were given, orally, 14C-fructose either alone or in conjunction with dihydroxyacetone, glyceraldehyde, or glycerol. Glycerol was also administered with 14C-glucose in a dose equimolar with fructose. After 2 hr the rats were killed and the liver triglyceride fraction was separated. Estimations of the degree of incorporation of 14C from the radioactive labeled carbohydrate into the glycerol and fatty acid moieties were carried out. Dihydroxyacetone and glyceraldehyde reduced the incorporation of 14C-fructose into hepatic triglyceride to approximately equal extents, suggesting that both trioses contribute equally to alpha-glycerophosphate formation. Glycerol, however, brought about a profound increase in the amount of fructose converted to triglyceride. This effect of glycerol was not apparent to any measurable extent on glucose incorporation into triglyceride and none of the intermediates affected the proportional distribution of radioactive counts between the fatty acid and glycerol moieties of the triglyceride after 14C-fructose administration.

Animals↗
PubMed1977

Some effects, in baboons, of chronic ingestion of glycerol with sucrose or glucose.

Six mature male and six mature female baboons were given fat-free diets high in sucrose or glucose together with glycerol, a chow diet with glycerol, and a fat-free high sucrose diet without glycerol. In the male animals, the concentration of triglyceride, cholesterol, glucose, and glycerol in fasting serum was significantly greater when sucrose and glycerol were given together compared with the other diets. The fasting serum triglyceride and cholesterol were significantly greater in the females on the sucrose + glycerol diet compared to the glucose + glycerol diet. It is suggested that glycerol and fructose (in sucrose) share a metabolic pathway that leads to an enhancement of serum lipid concentrations.

Animals↗
PubMed1975

An investigation in rats, into the metabolic consequences of early ingestion of dietary carbohydrates.

Weanling rats were given diets containing a high proportion of either glucose, sucrose or fructose until they reached 200 g weight, when they were either transferred to a control (chow) diet for 4 weeks or killed. The results were compared with rats receiving a control diet throughout. The triglyceride (TG) and cholesterol levels in liver and in serum had returned to values similar to the control animals 4 weeks after being given the control diet. The fatty acid profile of liver TG and adipose lipid tended to take longer to return to normal.

Adipose Tissue↗
PubMed1975

Lipid response to female gonadal hormones of female rats fed a high glucose or a high fructose diet.

Sexually mature female rats were given, for 11 weeks, diets high in fructose or glucose and at the same time oestrogen and progestogen were administered both singly and together. Analysis of the lipids in the liver, serum and adipose tissue was carried out after ingestion of 14C-fructose or glucose. Oestrogen lowered the liver triglyceride level but raised the serum triglyceride concentration. Progestogen tended to raise both cholesterol and triglyceride levels in liver and serum and it also caused a greater increase in body weight than in control or in the oestrogen animals. An increased specific activity was seen at first in the adipose tissue of the glucose-fed rats receiving the hormones. Overall, there was a tendency for the female gonadal hormones to exaggerate the changes brought about by the high carbohydrate diets.

Adipose Tissue↗