Stability of cucurbitacin E in human plasma: chemical hydrolysis and role of plasma esterases.

Abstract:

:It was shown previously that the anticancerous cytotoxic oxygenated triterpenes, cucurbitacin E (Cuc E) and its deacetylated form, cucurbitacin I (Cuc I), interacted differently with human serum albumin. In this study, the biochemical stability of Cuc E was investigated in vitro by reverse-phase high performance liquid chromatography. The hydrolysis rate in acidic and alkaline solutions, and in enzymatic conditions in human plasma and in purified plasma esterase solutions of butyrylcholinesterase and albumin, was compared with that measured in phosphate buffer saline (pH 7.4). Cuc E hydrolysis was detected in all the in vitro tests, but the extent of hydrolysis varied according to the different enzymatic and non-enzymatic conditions. A remarkable rapid hydrolysis of Cuc E was detected in acidic and alkaline solutions. A significant rate of hydrolysis of Cuc E was monitored in human plasma and was associated with the detection of Cuc I. The stability of Cuc E was greatly enhanced in the presence of albumin. However, purified butyrylcholinesterase had no effect on Cuc E stability. Among specific inhibitors of plasma esterases, only EDTA increased Cuc E stability, suggesting that paraoxonase is the human plasma esterase involved in the hydrolysis of Cuc E.

journal_name

Biopharm Drug Dispos

authors

Saade M,Magdalou J,Ouaini N,Greige-Gerges H

doi

10.1002/bdd.673

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

389-97

issue

7

eissn

0142-2782

issn

1099-081X

journal_volume

30

pub_type

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