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The effect of Hypecoum erectum L. extract on the morphofunctional condition of the liver in rats with experimental tetracycline-associated hepatitis was studied. The experiment included 40 albino rats Wistar. The animals treated with tetracycline hydrochloride (1.0 g/kg body weight) were exposed to the extract in a dose of 50 mg/kg for 5 days. On the 7th day of the experiment the following indices were determined: malonic dialdehyde concentration, catalase activity, the levels of ATP, pyruvate and lactate in the liver homogenate, as well as the blood levels of reduced glutathione. The liver pathomorphological investigation was applied. The H. erectum extract was shown to inhibit lipid peroxidation, to increase the activity of the host endogenous antioxidant system, to normalize the hepatocyte energy provision and to limit the liver degeneration.

The hepatoprotective activity of remaxol, reamberin and ademethionine was studied on a model of the liver injury induced by antituberculosis drugs. The study included 30 male uninbred albino rats. The following antituberculosis drugs were used: isoniazid (50 mg/kg) subcutaneously + rifampicin (250 mg/kg) intragastrically + pyrazinamide (45 mg/kg) intragastically (by the procedure of Yu. I. Slivka, 1989). Remaxol, reamberin and ademethionine were administered 1.5 hour prior to the antituberculosis drugs. The treatment course was 14 days. It was shown that remaxol, reamberin and ademethionin were able to correct the structural and functional disorders in the liver due to the use of the antituberculosis drugs. By the impact on the biochemical indices, evident of the liver function condition, remaxol showed the maximum effect. The effect of ream-berin was somewhat lower and the results of the ademethionine use were less significant. Remaxol had also a distinct effect as for lowering the level of the structural injuries in the liver, evident from recovery of the organ histoarchitectonics, less extended carbohydrate, albuminous and fatty degeneration, more active intracellular regeneration. It was noted that ademethionine had an insignificant effect on necrobiosis. Moreover, there was once detected a large necrosis focus, evident of possible stimulation of the liver tissue alteration by the drug.

In experiments on 182 white male rats hepatitis was modelled by percutaneous injection of 0.1 ml/500 g of tetrachloromethane (TCM) dissolved in olive oil. TCM was injected every other day for 65 days. After development of hepatitis (in 65 days) synthesis of glutamine and urea, partial oxygen pressure in the liver were studied. It is shown that modelling of chronic hepatitis leads to impairment of glutamine and urea synthesis, reduction of tissue blood flow and oxygen partial pressure. It is suggested that the reason of these changes is inhibition activity of glutamate dehydrogenase, arginase and short-term depression activity of phosphate-dependent glutaminase. The changes in the enzymatic activity lead to lowering tissue level of glutamine, urea, accumulation of ammonia ions. These changes persist for 14 days after the last injection of tetrachloromethane.

In experimental injury of the liver in Wistar-line white rats induced by tetracycline the course therapeutic and prophylatic administration of the dry extract "Hepatophyt" in a dose of 0.1 g/kg inhibits the negative effect of tetracycline and promotes stimulation of choleretic and antitoxic functions of the liver. The dry extract was derived from the herbal mix of the same name, used in the practice of Tibetan medicine against liver diseases.

In chronic hepatitis induced by long-term CCl4 administration to rats, there was largely an increase in the formation of malonic dialdehyde and Schiff bases, an elevation of glycosaminoglycans and hydroxyproline in collagen fractions, and proliferation of hepatic fibrous tissue. Therapy of CCl4-induced hepatitis with the hepatoprotective antioxidants essentiale and legalone led to decreases in the rate of lipid peroxidation, the production of glycosaminoglycans and collagen and to morphological manifestations of hepatic fibrosis. There was a moderate correlation between the indices of lipid peroxidation and hepatic fibrosis.

It was demonstrated in experiments on Wistar rats with carbon tetrachloride induced acute and chronic affection of the liver that the supernatant of the splenic cells of the poisoned animals contains 2 undialyzable factors with a molecular mass of more than 150 and 10-12 kDa. The splenocytic substances stimulate hepatocyte proliferation both in healthy allogeneic recipients and under conditions of increased proliferative activity of hepatocytes in experimental pathology of the liver.

The antioxidant and membrane-stabilizing activities of D-glucosamine were studied on two models of toxic liver damage. When administered in a dose of 50 mg/kg, D-glucosamine was found to prevent the development of the hepatocyte cytolysis syndrome, to normalize the cholate- and glycogen-synthetic functions of the liver. D-glucosamine exhibited a significant anabolic effect that also supplemented its hepatoprotective activity.

Comparative efficacy of hepatoprotective agents in tetracycline affection of the liver is discussed. The affection was induced by daily intragastric administration of the antibiotic in a dose of 0.5 g/kg body weight to Wistar albino rats. The level of the hepatocyte affection and the efficacy of the hepatoprotective agents were judged by changes in the biligenic, glycogen producing, antitoxic and absorbing-excretory functions of the liver and the activity of lipid peroxidation (LPO) and serum enzymes. In acute tetracycline intoxication there was observed suppression of cholopoiesis, induction of LPO, increased permeability of hepatocyte membranes, lowered stabilizing activity of bile and decreased detoxicating and absorbing-excretory capacity of the liver. The highest correcting effect of the hepatoprotective agents was shown with respect to cholopoiesis, carbohydrate metabolism and lipoperoxidation of hepatocyte membranes. The efficacy of silibor in tetracycline affection of the liver was close to that of Essentiale and legalon and superior to that of LIV-52.

A pronounced cholagogic effect of kaleflon was found in the experiment on albino rats. The course administration of kaleflon in a dose of 0.05 g/kg exerts a marked pharmacotherapeutic action on the course of experimental hepatitis.

Pharmacotherapeutic efficacy of antihepatoxic tea was studied on an experimental model of tetracycline-induced hepatitis. It was concluded that the tea had a marked pharmacotherapeutic effect on the process of tetracycline-induced hepatitis in animals. It lowered the level of the cytolytic syndrome, prevented the progress of cholestasis and stimulated the bile secretory function of the liver. The favourable effect of the plant antihepatotoxic preparation was due to the presence of a complex of its biologically active substances.

The study revealed that a comprehensive assessment of proliferation and hepatocyte polyploidy serves as an integral indicator of compensator liver regeneration and its resistance. The development of reparative regeneration is correlated with the accumulation of the significant amount of destructive cells and is regarded as an adequate reaction to the damaging effect of toxic agents. Thus it is possible to consider reparative regeneration as an indicator of hepatotoxic effect under hygienic regulation and to justify its examination under the effect of environmental hygienic factors.

Phytoecdysteroids from Rhaponticum carthemoides (Willd) Iljin and Ajuga turkestanica (Rgl.) Brig in a dose of 5 mg/kg per os markedly stimulate the bile secretion in normal rats treated with single (cyasterone) and 7-day-long (ecdysterone, cyasterone) administration. The chemical composition of the bile is significantly improved because of increased levels of bile acids and bilirubin and a decreased cholesterol content. Phytoecdysteroids (ecdysterone) exert more beneficial effect on the parameters under study in rats with toxic hepatitis induced by heliotrine.

In experiments on 33 albino male rats it was established that during allyl alcohol-induced damage of the liver its excretory function is impaired that was judged by the biliary excretion of intravenously injected Bengal pink-131I. Antioxidants (tocopherol acetate, sodium selenite, unithiol) reduced the toxic effect of allyl alcohol on the liver.