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Biomedical subjects

L M Shafran

Publications and source records attributed to L M Shafran.

33 records · Page 2Linked to original sources
PubMedDate not supplied

[Lipid peroxidation and the trace element content of the blood in patients with lichen ruber planus of the oral mucosa].

Examinations of 143 patients with lichen planus of the buccal mucosa and of 45 normal subjects included studies of lipid peroxidation (LPO) activity and of anti-radical defence system, as well as measurements of a number of blood trace elements. Plasma and red cell LPO intensity in the patients was several times higher than in the controls. Plasma glutathione peroxidase activity was found essentially reduced in the patients, whereas in red cells this activity surpassed 5 times the normal values. Glutathione reductase plasma activity was elevated and its red cell activity decreased. These findings indicate significant LPO disorders in the patients with lichen planus; their blood trace element levels were also found changed.

Adult↗
PubMedDate not supplied

[Lipid peroxidation, peroxidase activity and glutathione antiperoxide systems in rat tissues under conditions of high altitude hypoxia].

The content of lipid peroxides in rat tissues does not vary essentially under conditions of high altitude hypoxia. The peroxidase activity undergoes fluctuating changes with a significant increase in brain tissues. Among the enzymes of the glutathione antiperoxide system only the glutathione peroxidase activity shows a 5-10-fold decrease. As assumption is advanced that under conditions of hypoxia there occurs an inhibition of the glutathione antiperoxide system, which prevents the lipid peroxides level in tissues from falling.

Altitude↗
PubMedDate not supplied

[Effect of bis(n-tributyltin)-oxide on the brain GABA-ergic system in vitro].

Wide concentration range (10(-14)-10(-4) M) of bis-(n-tributyltin)-oxide effect on Na(+)-dependent uptake, spontaneous and K(+)-stimulated release, specific receptor binding and GABA metabolism were studied in vitro experiments using brain slices, synaptic membrane fraction and brain tissue homogenates. It is shown that the dependence "concentration-effect" is of non-linear character in all cases. Prevailing suppression of Na(+)-dependent uptake and specific receptor binding during K(+)-stimulated release and metabolism (production and utilization) of GABA activation were marked as a general tendency. Mechanisms of TBTO effect on the studied processes and the involvement of GABA-ergic system in realization of TBTO neurotoxic effects are discussed.

Animals↗