RESUMO
Objective To observe the photochemical effect of methylene blue (MB) on the inactivation of E. coli in blood and on biological functions of blood cells. Methods The blood was treated with 15 ?mol/L MB, 40 000 Lux halogen lamp irradiation and 0.35 mmol/l rutin for 10～40 min. The photochemical effect of MB on the inactivation of E.coli in blood was observed. The changes of biologic functions of blood cells were measured by means of RBC membrane binding to poly L lysine, reaction promoted by ATP enzyme and neutrophil phagocytosis tests. Results After treatment for 40 min, the E.coli count in blood decreased by 5 log units. The value of T/E of MB and irradiation of halogen lamp was higher than 1. No obvious changes of the morphology of blood cell were found. The negative electrical charges on membrane of RBC decreased by 11.23%～25.49%. After treatment of the blood for 20～30 min, the activity of Na + K +ATP enzyme of RBC membrane increased by 7.60%～20.07%. When the blood had been treated for 10～20 min, the positive rate of neutrophil phagocytosis enhanced by 9.00%. Conclusion MB photochemical treatment can effectively inactivate E. coli in blood. Under morphology specific condition of effectively inactivated blood bacteria, the shapes and functions of blood cells are not altered, but the RBC adhesion may increase by about 11.23%～25.49%.
RESUMO
Ectopic human chorionic gonadotrophin (hCG) is an autocrine hormone expressed by most malignant tumor cells. Increasing data recently showed that the expression pattern and biological properties of ectopic hCG was significantly different from that of the normal hCG secreted by trophoblastic cells. Evidence from different research groups strongly indicated that there was a direct relationship between the expression of ectopic hCG and the development of malignant tumor. Ectopic hCG may play a key role in regulation of tumor growth,metastasis and immune tolerance versus malignant tumor. The advances in the research of the molecular biologic characteristics and functions of ectopic hCG are reviewed and evaluated. [