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Phototoxicity in near-infrared photoimmunotherapy is influenced by the subcellular localization of antibody-IR700.

Abstract：

BACKGROUND:Near-infrared photoimmunotherapy (NIR-PIT) is a newly developed cancer phototherapy that utilizes monoclonal antibody-IRDye700DX conjugates (mAb-IR700) and NIR light. We previously reported that mAb-IR700 aggregated on the plasma membrane and induced physical damage within the membrane, leading to necrotic/immunogenic cancer cell death. However, cytotoxic effects caused by internalized mAb-IR700, which is localized in lysosomes after endocytosis, remain unclear. Thus, in this study, we investigated how internalized mAb-IR700 influences phototoxicity. METHODS:Cytotoxicity depending on the subcellular localization of mAb-IR700 was examined by varying the incubation time after washing. The influence of a singlet oxygen (1O2) was examined by cell viability assay in the presence of 1O2 quencher. The type of cell death was analyzed by flow cytometry with Annexin V/propidium iodide. Furthermore, IR700 fluorescence in cells was observed by fluorescence microscopy. RESULTS:mAb-IR700 in lysosomes induced cytotoxicity, which was weaker than that induced by mAb-IR700 on plasma membranes. Cellular damage caused by mAb-IR700 in lysosomes was completely inhibited by an 1O2 quencher. mAb-IR700 on plasma membranes and in lysosomes induced necrotic, but not apoptotic, cell death. IR700 was localized in lysosomes before light irradiation but then diffused into the cytosol immediately after irradiation. CONCLUSIONS:Although the main cytotoxic trigger in NIR-PIT is plasma membrane damage as previously reported, mAb-IR700 in lysosomes also induces necrotic cell death. The internalized mAb-IR700 caused 1O2-mediated damage, leading to the marked leakage of lysosomal contents into the cytosol. The mechanism of NIR-PIT depends on the subcellular localization of mAb-IR700.

journal_name

Photodiagnosis Photodyn Ther

journal_title

Photodiagnosis and photodynamic therapy

authors

Nakajima K,Ogawa M

doi

10.1016/j.pdpdt.2020.101926

subject

Has Abstract

pub_date

2020-09-01 00:00:00

pages

101926

eissn

1572-1000

issn

1873-1597

pii

S1572-1000(20)30280-5

journal_volume

31

pub_type

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