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Biomedical subjects

S Leoni

Publications and source records attributed to S Leoni.

At least 91 records · Page 5Linked to original sources
PubMed1980

Plasma membrane changes associated with rat liver regeneration.

The lipid composition and fluidity of plasma membranes have been studied at different stages of liver regeneration (4, 15 and 24 h after surgery). The phospholipid and fatty acid composition is not modified, whereas the cholesterol/phospholipid ratio is lower with respect to control membranes. The modification of the physical properties of the membranes has been studied directly by EPR analysis and indirectly by temperature dependence and cooperativity of some membrane-bound enzymes (Mg2+-ATPase, (Na+ + K+)-ATPase and 5'nucleotidase). Surgical operation or anaesthesia alone causes an early increase in fluidity; such an effect appears to be markedly reduced at a later stage. There seems to be a marked effect of regeneration on plasma membrane fluidity 15 h after partial hepatectomy when several parameters--surface fluidity, cholesterol/phospholipid ratio, and 5'-nucleotidase activity in the presence of concanavalin A -- are modified and indicate an increase in membrane fluidity. It is suggested that this modification of membrane properties could be related to the proliferative process.

Adenosine Triphosphatases↗
PubMed1980

Effect of colchicine on rat liver plasma membrane.

Colchicine effect has been tested on rat liver plasma membrane-bound enzymes after in vitro or in vivo treatment. It appears that the in vitro treatment does not affect 5'-nucleotidase, Mg2+-ATPase and (Na+ + K+)-ATPase, whereas adenylate cyclase is sensitive to both in vitro and in vivo treatment, the latter condition being also effective for 5'-nucleotidase.

Adenosine Triphosphatases↗
PubMed1980

Leiomyoma of the prepuce.

A rare case of leiomyoma of the prepuce treated with wide circumcision is presented.

Circumcision, Male↗
PubMed1979

[Activity of glucose-6-phosphatase during liver regeneration].

During hepatic regeneration a drop in the liver glycogen content along with a lower blood glucose level have been observed. These data are difficult to correlate with the rise of blood glucagon and the drop of insulin shown at the same times after partial hepatectomy. Therefore, liver glucose-6-phosphatase activity has been studied at 1.5, 4, 15 and 24 h, since that enzyme is involved in the release of glucose from the cell. 4 and 15 h after partial hepatectomy a remarkable decrease in glucose-6-phosphatase activity is observed. These results are discussed in view of the higher metabolic demand of regenerating liver.

Animals↗
PubMed1979

[Interference of some detergent micelles with the titration of protein].

We have examined the possible interferences with spectrophotometric protein determination of some detergents commonly used for the solubilization of membrane proteins. The results show that some mixtures of Triton X100 with SDS or DOC, at given concentrations, interfere with BSA determination by the method of Lowry.

Animals↗
PubMed1979

Immunofluorescence in the study of sclerosing retroperitonitis.

Two cases of retroperitoneal fibrosis are presented. Etiopathogenetic problems connected with various drugs are discussed, among which the methysergide is of paramount importance as well as the less known drugs such as reserpine. Histologic structures were studied by immunofluorescence which gives evidence of the antigen coloring the compound with specific gamma-globulins combined with a strongly fluorescent drug (fluorescein): its positivity is clear and precise with total anti-Ig serum, as well as with anti-IgG, less weak with anti-IgA, and negative with anti-IgM. Such results advocate a tissular immunity movement and stress the theory which aims to focus retroperitoneal fibrosis within the chapter of autoimmunization diseases.

Autoimmune Diseases↗