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Biomedical subjects

J T Harries

Publications and source records attributed to J T Harries.

At least 91 records · Page 5Linked to original sources
PubMed1975

Influence of mixtures of taurocholate, fatty acids, and monolein on the toxic effects of deoxycholate in rat jejunum in vivo.

The influence of mixtures of taurocholate (TC), oleic acid (OA), caprylic acid (CA), and monolein (MO) on the toxic effects of deoxycholate (DC) in rat jejunum have been investigated using both a closed loop and perfusion technique. DC induced net secretion of water and electrolytes, inhibited glucose transport and transmural potential difference (PD), and inactivated mucosal "total" and (Na+ -K+)-adenosine triphosphatase. Secretion was reversed to absorption when the instilled or perfused solutions were composed of mixtures of DC, TC and OA; substitution of MO or CA for OA produced a similar effect. DC-induced inhibition of PD, glucose absorption, and mucosal adenosine triphosphatase activity was abolished when DC was mixed with TC and OA. Oleic acid emulsions had no effect on secretion induced by DC. Absorption of DC was inhibited from mixed micellar solutions (TC, OA, DC) but not from pure micellar solutions (TC, DC). These results indicate that the presence of taurocholate and fatty acids or monolein within the intestinal lumen markedly modify a number of the toxic effects of DC on jejunal function. The clinical effects of DC on intestinal function in man may therefore depend on the relative concentrations of other bile salts and lipids within the intestinal lumen.

Adenosine Triphosphatases↗
PubMed1974

The relative importance of the factors involved in the absorption of vitamin E in children.

The vitamin E status and ease of repletion in groups of children with coeliac disease, intestinal lymphangiectasia, and abetalipoproteinaemia was studied and compared with earlier studies in cystic fibrosis and obstructive jaundice. Each group represents an experimental model in which one of the transport steps involved in the absorption of vitamin E is defective or absent and thus the relative importance of these factors could be determined. Chylomicron formation and an adequate intraluminal concentration of bile salts were found to be the most important factors for the efficient absorption of the vitamin. The results in the five groups of patients have therapeutic implications if it is considered desirable to correct vitamin E deficiency states.

Abetalipoproteinemia↗
PubMed1972

The effects of different bile salts on the absorption of fluid, electrolytes, and monosaccharides in the small intestine of the rat in vivo.

The effects of different bile salts on the absorption of fluid, electrolytes, and monosaccharides have been investigated in the rat small intestine in vivo. In the jejunum, deoxycholate (1 mM) impaired absorption of water and potassium, but not of sodium or glucose; at higher concentrations (2.5 and 5 mM) secretion of fluid and electrolytes occurred, and glucose and fructose absorption was impaired. By contrast, in the ileum, 1 mM deoxycholate failed to inhibit fluid and electrolyte absorption, and a concentration of 10 mM was required completely to inhibit absorption; secretion was not observed in the ileum. Chenodeoxycholate (5 mM) produced a similar effect to deoxycholate on fluid and electrolyte absorption in both jejunum and ileum, but taurocholate (5 mM) and taurodeoxycholate (5 mM) were ineffective.In jejunum, cholate, taurocholate, and taurodeoxycholate, each at a concentration of 5 mM, were less effective inhibitors of glucose transport than deoxycholate; chenodeoxycholate failed to inhibit glucose absorption. Deoxycholate produced histological damage at 5 mM, but not at lower concentrations. The functional and structural abnormalities were shown to be reversible phenomena. These findings may be relevant to the pathogenesis of diarrhoea in patients with bacterial overgrowth in the small intestine.

Animals↗