Human serum butyrylcholinesterase interactions with cisplatin and cyclophosphamide.

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Bodur E

Human serum butyrylcholinesterase interactions with cisplatin and cyclophosphamide.

Biochimie. 2010 Aug;92(8):979-84. doi: 10.1016/j.biochi.2010.04.010. Epub 2010 Apr 24.

PubMed ID

20417682 [ View in PubMed

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Abstract

Human serum Butyrylcholinesterase (BChE) is an important enzyme in detoxification with its capacity for hydrolyzing esters. The inhibitory effect of cisplatin (CDDP) and cyclophosphamide (CY) on BChE is characterized. Time dependent inhibition of BChE with both chemotherapeutics was rapid, reversible. CY was found as non-competitive inhibitor with Ki of 503.6 +/- 50.4 microM. Time dependent CDDP studies displayed progressive inhibition. The constants for apparent dissociation (Ka), first order constant for the break down of the Michaelis complex (k + 2), and bimolecular rate (ka) were calculated as 6.38 x 10(-5) M(-1) min(-1), 0.063 min(-1), and 9.83 x 10(-4) M, respectively. Enzyme protection could be achieved with moderate butyrylthiocholine concentrations (0.3 mM) but higher concentrations increased CDDP inhibition. Apparent Ki value for CDDP was 191.8 +/- 71.2 microM. These results suggest that used in combination therapy, CY and CDDP cause considerable BChE inhibition and may aggravate conditions observed during chemotherapy.

DrugBank Data that Cites this Article

Drug Enzymes

Drug	Enzyme	Kind	Organism	Pharmacological Action	Actions
Cisplatin	Cholinesterase	Protein	Humans	Unknown	Inhibitor	Details