Verjee, Sheela

Verjee

Sheela

Verjee, Sheela

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Evaluation of the intestinal absorption mechanism of casearin X in Caco-2 cells with Modified carboxylesterase activity
(American Chemical Society, 2016) Moreira da Silva, Rodrigo; Verjee, Sheela; De Gaitani, Cristiane Masetto; Moraes de Oliveira, Anderson Rodrigo; Pires Bueno, Paula Carolina; Cavalheiro, Alberto José; Peporine Lopes, Norberto; Butterweck, Veronika [in: Journal of Natural Products]
The clerodane diterpene casearin X (1), isolated from the leaves of Casearia sylvestris, is a potential new drug candidate due to its potent in vitro cytotoxic activity. In this work, the intestinal absorption mechanism of 1 was evaluated using Caco-2 cells with and without active carboxylesterases (CES). An LC-MS method was developed and validated for the quantification of 1. The estn. of permeability coeffs. was possible only under CES-inhibited conditions in which 1 is able to cross the Caco-2 cell monolayer. The mechanism is probably by active transport, with no significant efflux, but with a high retention of the compd. inside the cells. The enzymic hydrolysis assay demonstrates the susceptibility of 1 to first-pass metab. as substrate for specific CES expressed in human intestine.
01A - Beitrag in wissenschaftlicher Zeitschrift