[Modification of the carcinogenic effect of 3,4-benzpyrene by thymosin and cyclophosphane].
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Biomedical subjects
Publications and source records attributed to S P Gordienko.
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In experimental alloxan diabetes marked hypocalcemia and hyperglycemia are observed in the blood of rats during the acute period of the disease (from 1.5 to 2 months). After 2.5-3.5 months of diabetes calcium level reaches the upper normal limit. Simultaneously, antibodies to calcitonin appear. It is quite likely that excessive calcitonin secretion, leading to hypocalcemia, decreased insulin secretion and hyperglycemia take place in the acute stage of diabetes. When diabetes persists the antibodies to calcitonin which reveal a homeostatic reaction blocking the excess of calcitonin appear. This normalizes the level of calcium in the blood and prevents the further increase in the blood sugar level.
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Antibodies to calcitonin, parathyroid hormone and cortisol are detected in acute stage of infection-caused bronchial asthma. The appearance of antibodies is paralleled by marked hypercalcaemia. The antibodies may bind excessive hormones in the blood, preventing further hormonal imbalance. Ten-day treatment with glucocorticoids decreased the amount of antibodies possibly due to normalization of hormonal secretion and restoration of their balance. As a result, calcium blood levels returned to normal.
The oncogenesis induced by the monkey SA7(C8) adenovirus in CBA/Ca mice has shown that immune responses to embryonal antigens are formed at early stages of the latent period and are preserved for a long time reaching the maximum by the 30th day of the latent period. The observed immune response to early embryonal antigens is considered as a factor of the tumour growth immunostimulation and also as a condition limiting the antitumour immunity.
Antibodies to calcitonin appear in blood of rats with experimental alloxan diabetes. This phenomenon is observed only under high blood sugar. At the stage of latent diabetes, i.e. during alloxan administration to the body and low blood sugar no antibodies to calcitonin are detected. It is possible that appearance of autoantibodies to calcitonin is one of pathogenetic factors of hyperglycemia development in rats with alloxan diabetes.
Lately it appeared to be necessary to develop-alternative methods for control of antibiotic therapy. Detection of low molecular substances based on the immunoenzymatic assay (IEA) is one of the most promising approaches to the development of such methods. The authors developed a quantitative method for determination of benzylpenicillin (BP) according to the procedure described earlier by Van Weemen. The BP antisera were prepared by immunization of rabbits with a conjugate of bovine serum albumin. The gamma-globulin fraction isolated from the antisera was conjugated with peroxidase. The working dilution of the conjugate was determined by the chess titration method. The test system of competitive binding developed by the authors provides detection of BP in the biological fluids in concentrations of 0.1 to 0.0001 microgram/ml (by BP dry weight).
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