Fig. 7
From: Near-infrared photoresponsive drug delivery nanosystems for cancer photo-chemotherapy
(Reproduced from Ref. [114] with permission from Wiley-VCH, copyright 2019)
a Schematic illustration of assembly of UCNPs-LAAzoBCAzo/DOX. The enlarged section delineates the continuous photoisomerization of azo and cyclic hybridization and dehybridization of LAAzo and LB (DNA strands LAAzo, LCAzo with 3 azo moieties per DNA strand). b Synthesis of UCNPs/DOX-TAT-HA. c Illustration of HA-mediated endocytosis, TAT-mediated nuclear targeting and NIR-triggered drug release in living cells