[Influence of GABA derivatives on some indices of lipid peroxidation in immunocompetent organs under experimental immunopathology conditions].

The effects of GABA derivatives phenotropil (25 mg/kg), phenibut (25 mg/kg), and baclofen (2 mg/kg) on the process of lipid peroxidation (LPO), as manifested by the initial level of malonic dialdehyde, velocity of spontaneous and ascorbate-dependent LPO, and the catalase activity in the homogenates of thymus and spleen, have been studied on rats of the Wistar line with cyclophosphamide (CPHA) immunodepression and lipopolysacharide (LPS) immune stress. It is established that, under the action of CPHA and LPS, activation of the LPO processes takes place in the immune organs. Under these conditions, changes of the catalase activity exhibited some specific features: in the animals under LPS action, the catalase activity increased in the spleen, while being decreased in the thymus; under the influence of CPHA, the activity of this enzyme decreased in both organs. An analysis of the antioxidant activity of GABA derivatives under the conditions of CPHA-induced immunodepression showed that all substances upon intraperitoneal introduction for 5 days favored the elimination of disturbances by suppressing the LPO processes and increasing the antioxidant protection activity. On the background of LPS-induced immune stress, all the tested substances showed a correcting action with respect to indicated biochemical processes in the thymus, while only phenibut activated the antioxidant system in the spleen.