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Biomedical subjects

S N Chari

Publications and source records attributed to S N Chari.

15 recordsLinked to original sources
PubMed1992

Sex variation in ascorbic acid catabolism.

Male and female albino rats of same age and body weight were pair fed with laboratory stock diet and ascorbic acid, dehydroascorbic acid and diketogulonic acid were determined in the liver and urine, while in blood only ascorbic acid was estimated. Male rats had concentration higher of ascorbic acid in liver and urine as compared with females, while there were no significant variations in the contents of dehydroascorbic acid and diketogulonic acid. Hepatic and renal 2, 3-diketoaldonate decarboxylase, and hepatic dehydroascorbatase were also found to be significantly higher in male rats. Similar sex variations were also observed in ascorbic acid catabolism in guinea pigs without any differences in urinary ascorbic acid contents.

Animals↗
PubMed1991

Leukocyte lipid profile in chronic alcoholics.

Polymorphonuclear leukocytic (PNML) lipid content was studied in chronic alcoholic and normal control subjects. Chronic alcoholic subjects showed abnormal liver function and abnormal serum lipid profile. PMNL obtained from chronic alcoholic subjects exhibited decreased free cholesterol and phospholipid contents, with a significant increase in cholesterol to phospholipid ratio. Although, there was no change in the free fatty acids, the levels of triglycerides were significantly elevated.

Adult↗
PubMed1984

Superoxide dismutase in diabetic polymorphonuclear leukocytes.

The level of superoxide anion was found to be significantly elevated in polymorphonuclear leukocytes (PMNL) from diabetic subjects as compared with those from normal subjects. This elevation was attributed to the significant reduction in the activities of both cytoplasmic and mitochondrial superoxide dismutase (SOD), the effect being more pronounced in the cytoplasmic fraction. Although the content of copper decreased considerably in the diabetic PMNL, the decrease in the zinc content was less significant, with an insignificant alteration in the content of manganese. PMNL obtained from insulin-treated diabetic patients showed considerable alleviation of SOD levels. The implication of these results are discussed herein.

Adult↗
PubMed1984

Action of vitamin P like compounds on lysosomal fragility in hypercholesterolemia: implication of ascorbic acid and its metabolites.

Possible mechanisms responsible for hepatic lysosomal fragility in hypercholesterolemic rats have been investigated. It was found that certain factor(s) present in the intracellular environment of liver were required for the release of lysosomal enzymes. Elevated hepatic dehydroascorbic acid content in hypercholesterolemic rats is thought to render the lysosomes fragile in this pathological state, since this compound was found to labilise the lysosomes in vitro. Quercetin and hesperidin were found to be responsible for lysosomal stability, probably by reducing the content of dehydroascorbic acid to a normal level in the hypercholesterolemic condition.

Animals↗
PubMed1983

Action of vitamin P like compounds on lysosomal status in hypercholesterolemic rats.

Vitamin P like compounds such as quercetin and hesperidin administered at a dose of 50 mg/Kg/day along with a hypercholesterolemic diet for three weeks significantly restored the elevated cholesterol/phospholipid ratio in rats. Both these flavonoids exerted in vivo a stabilising effect on lysosomes in rat liver which had been rendered fragile in hypercholesterolemic condition. Moreover, these compounds also possessed the stabilisation effect on lysosomes in vitro. The stabilisation effect exerted on lysosomes was found to be due to the retarded release of lysosomal acid hydrolases and not to enzyme inhibition. Such stabilisation of the lysosomes may have a beneficial role in partial amelioration of hypercholesterolemic conditions.

Animals↗
PubMedDate not supplied

Glutathione and its redox system in diabetic polymorphonuclear leukocytes.

The level of reduced glutathione in diabetic polymorphonuclear leukocytes was found to be significantly decreased compared to normal. Although the activity of glutathione reductase remained unchanged, the activity of glutathione peroxidase was found to be decreased in the diabetic state. Ketosis was not found to additionally aggravate the glutathione system. Polymorphonuclear leukocytes obtained from insulin-treated patients showed significant restoration.

Adult↗
PubMedDate not supplied

Sialic acid content and sialidase activity of polymorphonuclear leucocytes in diabetes mellitus.

The level of sialic acid in the diabetic polymorphonuclear leucocytes was found to be significantly reduced as compared to normal. More pronounced effects were observed with ketoacidotic as compared to nonketoacidotic diabetic polymorphonuclear leucocytes. Activity of sialic acid degrading enzyme, sialidase, was found to be increased with more pronounced effect in the ketotic state. Diabetic patients treated either with intravenous insulin or oral hypoglycemic drugs showed restoration to normalcy in both sialic acid content and sialidase activity. The implications of the result are discussed.

Adult↗
PubMedDate not supplied

In vitro effect of certain compounds on the lysosomal release of polymorphonuclear leukocytes.

From studies on the release of acid phosphatase and B-glucuronidase, it was observed that quercetin, a vitamin P like compound and ascorbic acid stablise while dehydroascorbate, acetoacetate and B-hydroxybutyrate labilise the leukocytic lysosomes in vitro. These effects were compared with chloroquine and progesterone, known stabiliser and destabiliser, respectively. The possible mode of lysosomal labilisation by ketone bodies and dehydroascorbate has been suggested.

3-Hydroxybutyric Acid↗