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Near-infrared AIE-active phosphorescent iridium() complex for mitochondria-targeted photodynamic therapy
Ist Teil von
Dalton transactions : an international journal of inorganic chemistry, 2023-01, Vol.52 (5), p.1291-13
Ort / Verlag
England: Royal Society of Chemistry
Erscheinungsjahr
2023
Quelle
MEDLINE
Beschreibungen/Notizen
Mitochondria-targeted photodynamic therapy (PDT) has recently been recognized as a promising strategy for effective cancer treatment. In this work, a mitochondria-targeted near-infrared (NIR) aggregation-induced emission (AIE)-active phosphorescent Ir(
iii
) complex (
Ir1
) is reported with highly favourable mitochondria-targeted bioimaging and cancer PDT properties. Complex
Ir1
has strong absorption in the visible light region (∼500 nm) and can effectively produce singlet oxygen (
1
O
2
) under green light (525 nm) irradiation. It preferentially accumulates in the mitochondria of human breast cancer MDA-MB-231 cells as revealed by colocalization analysis. Complex
Ir1
displays high phototoxicity toward human breast cancer MDA-MB-231 cells and mouse breast cancer 4T1 cells. Complex
Ir1
induces reactive oxygen species (ROS) production, mitochondrial dysfunction, and endoplasmic reticulum (ER) stress in MDA-MB-231 cells upon photoirradiation, leading to apoptotic cell death. The favorable PDT performance of
Ir1
in vivo
has been further demonstrated in tumour-bearing mice. Together, the results suggest that
Ir1
is a promising photosensitizer for mitochondria-targeted imaging and cancer phototherapy.
A near-infrared Ir(
iii
) complex with aggregation-induced emission (AIE) properties exhibits potent photodynamic anticancer activity
in vitro
and
in vivo
upon 525 nm light irradiation.