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[Enzyme kinetic analysis of Oncomelania hupensis exposed to active ingredient of Buddleja lindleyana (AIBL)].

OBJECTIVE
To analyze the enzyme kinetics of active ingredient of Buddleja lindleyana (AIBL) against Oncomelania hupensis, the intermediate host of Schistosoma japonicum.


METHODS
O. hupensis snails were placed in 1 000 ml of 3.55 mg/L AIBL solution for 24, 48 h and 72 h, respectively, and the enzyme kinetics of alanine aminotransferase (GPT) was determined by Reitman-Frankel assay, lactate dehydrogenase (LDH) by the chemical inhibition lactic acid substrate method, alkaline phosphatase (AKP) by the disodium phenyl phosphate colorimetric method, acetylcholine esterase (AChE) and malate dehydrogenas (MDH) by ELISA, and succinate dehydrogenase (SDH) by the phenazine methyl sulfate reaction method (PMS) in the soft tissues of O. hupensis before and after AIBL treatment.


RESULTS
Following exposure to 3.55 mg/L AIBL solution for 24 h, the GPT, LDH, and AKP activities significantly improved in the soft tissues of O. hupensis, while the SDH and MDH activities were significantly lowered in the head-foot and liver. However, AIBL treatment did not cause significant effect on AChE activity in O. hupensis.


CONCLUSIONS
AIBL causes significant damages to O. hupensis liver and can efficiently act on anaerobic and aerobic respiration loci, which will hinder energy metabolism, and cause inadequate energy supply in cells used for normal secretion, eventually leading to O. hupensis death.