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Biomedical subjects

C W Wilson

Publications and source records attributed to C W Wilson.

At least 37 records · Page 2Linked to original sources
PubMed1980

Protein-binding of ascorbic acid 2. Interaction with acetylsalicylic acid.

The effect of aspirin (ASP) on the binding of ascorbic acid (AA) to bovine serum albumin (BSA) has been investigated by the method of dynamic dialysis. Scatchard plots were constructed which confirmed that binding with AA occurred in the presence of BSA. When ASP was also present, greater curvature of the plot was demonstrated indicating that less binding of AA to BSA was taking place. The limiting slopes of the plots showed that ASP displaces both primary and secondary sites previously occupied by AA and that the strengths of both primary and secondary sites increased as a result of interaction with ASP. It is concluded that primary sites for binding of AA to BSA consist of two or more types of similar binding strengths, and that secondary binding also may involve binding on two or more sites. The pathophysiological implications are discussed.

Animals↗
PubMed1980

Food sensitivities, taste changes, aphthous ulcers and atopic symptoms in allergic disease.

Abnormalities in taste and buccal sensation, and production of abdominal symptoms, are associated with ingestion of specific foods by atopic individuals as shown by Food Sensitivity Analysis. Of 61 atopic patients all had abnormalities in buccal sensation and up to 87% related nausea or other abdominal symptoms to ingestion of specific foods. Eighty-two percent had positive skin tests to foods, 56% had a history of aphthous ulcers and 18% could associate development of the ulcers with ingestion of specific foods. Application of the responsible allergen to the ulcer base produced severe pain in these atopic patients. The patients with hay fever all had abnormalities of buccal sensation. Analysis of abnormalities in buccal sensation following consumption of food allergens appears to provide a sensitive discriminatory method for the identification of specific foods responsible for the multiple symptoms characterizing the allergic syndrome.

Abdomen↗
PubMed1980

Regional brain ascorbic acid distribution: its functional relationship to appetite and leptazol-induced convulsions in guinea-pigs.

The distribution of ascorbic acid has been compared in the fore-, mid- and hind-brains of guinea-pigs maintained on a scorbutogenic diet alone, or the diet with supplementary Vitamin C, or the supplemented diet and a terminal convulsant dose of leptazol after 27 days. At the beginning of the investigation, mid-brain ascorbic acid concentrations were similar in both sexes and highest in the mid-brain. After 27 days on the supplemented diet, levels of ascorbic acid were raised in all three brain sections and were still highest in the mid-brains. In the scorbutic group, ascorbic acid concentrations had not changed from control levels in the mid-brain, but had fallen in the other two sections. In a dose-range of 40-60 mg/kg, leptazol caused an increase in convulsive index, and progressive depletion of brain ascorbic acid. No change occurred in fore-brain ascorbic acid, a reduction took place in the hindbrain, and the greatest fall occurred in the mid-brain. It is concluded that ascorbic acid plays an essential role in mid-brain metabolism, and that the convulsant effect of leptazol is influenced by an interaction with brain ascorbic acid.

Animals↗
PubMed1979

Tissue ascorbic acid, fenfluramine, and changes in fat metabolism.

Following initial weight gain, reduction in appetite and pronounced weight loss occurred in scorbutic unsupplemented guinea-pigs. Hepatic ascorbic acid levels were significantly reduced and cholesterol concentration increased in the liver. Fenfluramine administration caused immediate loss of weight and appetite in the scorbutic guinea-pigs, these changes being more pronounced in the males. Hepatic ascorbic acid, cholesterol and triglycerides were reduced to lower levels in the fenfluramine-treated scorbutic animals than in the scorbutic guinea-pigs receiving diet alone. In contrast, weight and appetite increased in vitamin-C-supplemented animals while they were receiving fenfluramine. Their hepatic cholesterol and triglyceride levels became significantly reduced. It has been shown that supplementary vitamin C can inhibit the anti-obesity and anorectic actions of fenfluramine and counteract its effect in raising tissue cholesterol.

Animals↗
PubMed1979

Vitamin C and the anti-obesity effect of fenfluramine.

Increasing doses of fenfluramine were given to female guinea-pigs on a scorbutogenic diet with or without Ascorbic Acid (AA) supplementation. AA alone increased weight and appetite, hepatic and plasma AA. AA deficiency reduced weight after an initial rise. 10 mg/kg fenfluramine in association with the diet produced a gain in weight. Larger doses caused weight loss and reduced appetite. These effects were prevented by AA supplementation. Fenfluramine reduced hepatic and plasma AA significantly in comparison with the animals receiving the diet alone, or the diet with AA supplementation in the absence of fenfluramine administration. It is concluded that AA release plays an important role in the anti-obesity and anorectic actions of fenfluramine.

Animals↗
PubMed1978

Fenfluramine, vitamin C and weight loss.

Forty-two female patients with refractory obesity completed a 20-week double-blind study during which they were given a diet designed to provide not more than 40 mg vitamin C and 1000 kcal (4.2 MJ) daily. Twenty-two of the patients took 600 mg of supplementary vitamin C daily and the remainder, a matched placebo. All were given their highest tolerated dose of fenfluramine up to a maximum of 160 mg daily. There was no significant difference in the mean weight loss of the two groups. This study fails to support the hypothesis that the anti-obesity effect of fenfluramine is influenced by the vitamin C intake.

Administration, Oral↗
PubMed1978

Intestinal absorpiton of ascorbic acid and its passage through the lipoid membrane of guinea pigs.

Diffusion of ascorbic acid takes place through intestinal lipoid membrane of guinea-pigs. In consequence, plasma and leucocyte concentrations of ascorbic acid increase. Intestinal absorpiton of ascorbic acid in scorbutic guinea-pigs is impaired in contrast to that in normal and saturated guinea-pigs as shown by the accumulation of ascorbic acid in the intestinal mucosal cells of guinea-pigs.

Animals↗
PubMed1977

Dreaming, fenfluramine, and vitamin C.

The effect of increasing doses of fenfluramine on dream patterns was studied in 20 patients receiving a reducing diet with or without a controlled dietary intake of vitamin C daily. The dream pattern was unchanged in six patients and dreams disappeared in another who normally dreamed often. In 13 patients dreams increased in frequency and intensity, and in five the dreams assumed frightening proportions. There was a significant straight-line relation between response and the size of the dose. When placebo tablets were given to four patients their dreams disappeared or assumed their pretreatment normal pattern. Absence of vitamin C from the diet did not significantly affect the dream pattern. That fenfluramine has dose-related cerebral effects should be remembered in patients with a history of mental illness.

Ascorbic Acid↗
PubMed1977

The buccal absorption of ascorbic acid and its passage through lipoid membrane.

Ascorbic acid concentration was measured in centrifuged and uncentrifuged saliva from normal young adult men and women. The salivary ascorbic acid content of uncentrifuged saliva was significantly higher in women on account of the ascorbic acid contained in the cellular sediment. Ascorbic acid absorption into the buccal mucosa was measured from solutions of pH range 3.4-9.0 held in the mouth for periods of 1-9 minutes. For a constant mouth contact time, increase in pH of the loading solutions resulted in reduction of buccal absorption, and diminishing transfer into the buccal epithelium. Percentage absorption was greater in males than females throughout the pH range. At pH 5, 80% of the loading solution was absorbed after 5 minutes. Diffusion of ascorbic acid through the lipoid membrane was more rapid in males. Female buccal cells had significantly higher ascorbic acid concentrations than male cells. Absorption of laevo and dextro ascorbic acid in human beings can be considered as partitioning into, or passage through, a lipoid phase into the buccal cells. The rate of passage of ascorbic acid into the buccal lining cells under controlled conditions of pH and buccal contact time is pH and concentration dependent in human beings.

Adolescent↗