The Effects of Paclitaxel in the Combination of Diamond Nanoparticles on the Structure of Human Serum Albumin (HSA) and Their Antiproliferative Role on MDA-MB-231cells.

Since the interactions of anti-cancer agents with blood constituents, in particular with human serum albumin (HSA) may have a major impact on drug pharmacology, the present study designed to provide a fundamental understanding of the interaction of nanodiamonds (NDs) together with paclitaxel (PTX) with HSA in detail for the first time. The UV-Vis, steady-state fluorescence, far-UV CD and zeta potential results displayed that PTX + NDs could form a complex with HSA. Additionally, the values of binding constants and ΔG° showed that PTX + NDs interact strongly with HSA compared to PTX or NDs alone and the hydrophobic force plays a major role in this interaction. Moreover, the in vitro release behavior of PTX + NDs form HSA can be regulated at dissimilar pH levels. The anticancer property of 0.5 µM PTX + 20 µM NDs by MTT assay demonstrates that this combination can tremendously diminish the proliferation of MDA-MB-231cells compared to PTX or NDs alone. Altogether, the structure of HSA changed moderately in the presence of PTX + NDs and PTX + NDs can promote mortality of MDA-MB-231 cells besides those mortality effects induced via PTX or NDs alone. The results obtained from this study can help in understanding the pharmacokinetic properties of PTX + NDs.