[Effect of Zajdela ascite hepatoma growth on the extracellular antioxidant system of tumor bearer]

The influence of tumor development on the blood plasma antioxidant system in the area of tumor growth has been studied. Zajdela ascite hepatoma transplanted to the abdominal cavity of Vistar rats was used as a model of tumor growth. It hase been found that tumor development produced and imbalance between pro- and antioxidant systems in the organism of tumor bearer. Besides, a sharp decrease in tocopherol and uric acid concentrations (twice), as well as in the concentration of protein SH-groups (seven times) was noted. In the tumor growth area, along with the tocopherol level decrease, a 5-7 fold increase in the concentrations of uric acid and protein SH-groups was observed. As the concentration of low-molecular antioxidants decreases, the major part is played by protein components which bind or oxidize ions of variable valence. Thus, the level of transferrin (Tf, which is responsible for the transport of iron ions, is reduced in 2.5 to 3 times (from 5.0 to 1.6 mg/ml) in the blood plasma, whereas the Tf level in the ascitic fluid increased from 1.5 to 2.7 mg/ml. The concentration dynamics of the other protein functioning together with Tf, ceruloplasmin (Cp), had opposite (inverse) tendencies. Thus, the Cp concentration in the blood plasma increased 1.5-2 times (from 0.55 to 1.1 mg/ml) whereas it decreased from 0.55 mg/ml to 0.35 mg/ml in the ascites.

Effect of liposomes containing antioxidant, phospholipid, and amino acid on skin regeneration after chemical burn

Liposomes containing natural flavonoid dihydroquercetin, phospholipid lecithin, and zwitterionic amino acid glycine were used for the therapy of glacial acetic acid-induced chemical burn. No inflammatory reaction was observed in the region of wound. The area of postburn injury did not increase in time. Planimetry and histological studies showed that improved skin regeneration was accompanied by repair of hair follicles and sebaceous glands.

[Receptor binding oscillations]

A kinetic analysis of the delta-opiate receptor agonist, [3H] DADLE, binding to cell (NG108-15) suspensions has led to the discovery of a new periodic biological phenomenon, namely, receptor activity oscillations. The absence of oscillations for the antagonist binding to the receptors suggests that oscillations are generated only as a result of receptor signal transformation. The correlation between the quantitative characteristics of the kinetic curves and the experimental conditions points to the fact that receptor binding oscillations may be due either to the receptor binding to the G-protein or the interaction of the receptor (or G-protein) with microtubules.

Receptor binding on whole cells can oscillate

The study of the kinetics of binding of the opiate receptor agonist [3H]DADLE with NG108-15 cell suspensions has revealed a new periodic biological phenomenon, i.e., oscillations of the cellular receptor activity. The absence of oscillations for binding of the receptor antagonist shows that oscillations occur as a result of the transformation of the receptor signal only.