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Biomedical subjects

R Heller

Publications and source records attributed to R Heller.

At least 181 records · Page 10Linked to original sources
PubMed1979

[Suitability and recovery of capillary blood plasma for lipid determinations].

Plasma lipid analysis, particularly in population screening, can be facilitated by the use of capillary blood. A system for serial collection of capillary plasma is described. The concentrations of total cholesterol, HDL-cholesterol and triglycerides in heparinized capillary plasma and venous blood, respectively, are compared. No significant differences were found. Using the KAPA-method hemolytic samples are a source of error. They occurred with a frequency of about 3% in mass screening.

Capillaries↗
PubMed1977

Regulation of 3-hydroxy-3-methylglutaryl coenzyme a reductase in minimal deviation hepatoma 7288C. Immunological measurements in hepatoma tissue culture cells.

The mechanism of action of serum lipoproteins and 25-hydroxycholesterol on 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase activity in hepatoma tissue culture (HTC) cells was investigated using antiserum against purified rat liver HMG-CoA reductase (Heller, R. A., and Shrewsbury, M. A. (1976)J. Biol. Chem. 251, 3815-3822). This antiserum cross-reacted with solubilized and membrane-bound HMG-CoA reductase from HTC cells. The enzymes from rat liver and HTC cells appeared antigenically identical. The increase in HMG-CoA reductase activity of HTC cells grown in medium which lacked serum lipoproteins was shown to be due to an increase in immunoprecipitable enzyme. In contrast, the 25-hydroxycholesterol suppression of reductase activity leads to a reduction in the antigenicity of the enzyme rather than a decrease in its number of molecules.

Alcohol Oxidoreductases↗
PubMed1977

Stimulation of mucosal growth in the rat ileum by bile and pancreatic secretions after jejunal resection.

After proximal small bowel resection, the remaining small intestine undergoes adaptive hyperplasia. The role of bile and pancreatic secretions in stimulating ileal mucosal growth after jejunectomy was studied. Male Sprague-Dawley rats were fed either standard rat chow or a liquid elemental diet, and were divided into four surgical groups: sham-operated; transplantation of the duodenal papilla (containing the bile and pancreatic ducts) into the ileum; 50% proximal small bowel resection (jejunectomy); and combined transplantation of the duodenal papilla into the ileum and 50% proximal small bowel resection. Four weeks after surgery the rats were killed and segments of ileum were assayed for total weight and mucosal weight, and for DNA and protein concentration per centimeter of segment. These measurements of mucosal mass were significantly increased in ileal segments adjacent to the transplanted duodenal papilla both in nonresected and jejunectomized rats, compared with their respective controls. Transplanting the duodenal papilla into the ileum significantly increased growth of the ileal mucosa after jejunectomy. The results indicate that bile and pancreatic secretions flowing into the ileal lumen stimulate mucosal growth and play a direct role in ileal adaptation to jejunal resection.

Adaptation, Physiological↗