Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 209, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2021.112178
Keywords
SiRNA delivery; Antibacterial activity; Amphiphilic triblock polycations; Hydrophobic-hydrophilic balance; Proton buffering capacity
Funding
- National Natural Science Foundation of China [32171380, 31971306]
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The study reveals the possibility of dual optimization of siRNA intracellular delivery efficiency and antibacterial activity of amphiphilic polycations through rational structure design, making TDDE-3 micelles a promising candidate for potential clinical applications.
Optimal combination of hydrophobic-hydrophilic balance, proton buffering and electrostatic interaction is the key issue for designing polycations as efficient gene vectors and antibacterial agents. Herein, we screened a series of pH-sensitive quaternary ammonium-based amphiphilic triblock copolymers, mPEG(2k)-P(DPA(a)/DMA(b))-PQA(c) (TDDE-x), which had different pKa values and proton buffering capacities. Significantly, we found that both the highest siRNA intracellular delivery efficiency and the strongest antibacterial capacity occurred on TDDE-3 micelles with the segment structure of mPEG(2)(k)-P(DPA(50)/DMA(56))-PQA(55). The TDDE-3/siRNA complex achieved 67% silencing efficiency on H9C2 cells (N/P = 5, 50 nM siRNA), higher than the advanced commercial transfection reagents RNAiMAX (58%) and Lipo2000 (30%). Moreover, TDDE-3 micelles showed quite low MICs of 32 mu g/mL and 8 mu g/mL against E. coli and S. aureus, respectively. Further studies on the structure-function relationship indicated that TDDE-3 micelles could mediate robust endosome escape and siRNA cytosolic release, and strong bacterial cell membrane-destabilizing function. Undoubtedly, this work reveals the possibility for double optimization of siRNA intracellular delivery efficiency and antibacterial activity of amphiphilic polycations by reasonable structure design, which is significant for low-cost development and clinical translation of efficient multifunctional polycations.
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