To improve the drug delivery efficiency on target cells, many strategies have been developed including
Mesenchymal Stromal Cells (MSCs) approaches. In a previous study, we found that bone-marrow-derived MSCs
(BM-MSCs) were able to incorporate and release the anti-tumor and anti-angiogenic drug, Paclitaxel (PTX). In this
study, we evaluated the stability of PTX in standard cell culture conditions by analyzing the metabolites produced by
MSCs after their incorporation of the drug. We are able to show that MSCs do not release either 3-OH-PTX or 6-OH-PTX metabolites
(having a lower anticancer activity) but release an active PTX molecule together with the isomer 7-Epitaxol, is known to maintain the
whole biological activity. This confirms that the simple procedure of MSCs priming with a drug (without any genetic cell manipulation),
in our case PTX, does not modify the activity of the molecule and provides a new biological-device to carry and deliver PTX in tumor
sites, by contributing to improve drug efficacy and target selectivity in cancer therapy.
Keywords: Anti-tumor activity, cancer, drug delivery, mesenchymal stromal cell, paclitaxel.
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