International journal of nanomedicine
PD-L1 Aptamer-Functionalized Mesoporous Silica Nanoparticles for Targeted Doxorubicin Delivery in Triple-Negative Breast Cancer
By Tan J, Hu Z, Huang D and 4 others.
Abstract
Background
Triple-negative breast cancer (TNBC) remains highly aggressive and lacks effective molecularly targeted therapies. Programmed death-ligand 1 (PD-L1) represents a potential cell-surface target for selective drug delivery.
Objective
To develop and evaluate a PD-L1 aptamer-functionalized mesoporous silica nanoparticle system loaded with doxorubicin (Apt-PD-L1-MSN/DOX) for targeted DOX delivery in TNBC.
Methods
Apt-PD-L1-MSN/DOX was synthesized and characterized by TEM, DLS, zeta-potential measurement, FT-IR, and UV-Vis analysis. DOX release was evaluated at pH 7.4, 6.5, and 5.0. Cellular targeting, cytotoxicity, and aptamer-blocking effects were assessed in MDA-MB-231 and MCF-10A cells. In vivo fluorescence distribution, antitumor efficacy, and short-term safety were evaluated in MDA-MB-231 xenograft-bearing mice.