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Issue 12, 2021
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Biotin-decorated NIR-absorbing nanosheets for targeted photodynamic cancer therapy

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Abstract

Targeted photodynamic therapy (PDT) is one of the promising approaches for the selective killing of cancerous cells without affecting the normal cells, and hence designing new strategies for targeted PDT is extremely important. Herein we report the design and synthesis of a new class of nanosheets derived from the self-assembly of the iodo-BODIPY–biotin conjugate as a photosensitizer for targeted PDT applications. The nanosheet exhibits a high extinction coefficient in the NIR region, high singlet oxygen efficiency, no toxicity in the dark and cell targeting ligands (biotin) on the surface, which are necessary features required for an ideal photosensitizer. Overexpression of sodium-dependent multivitamin transporters (SMVTs) in HeLa and A549 (biotin receptor positive cell lines) is explored for the selective uptake of the nanophotosensitizer through receptor mediated endocytosis (interaction between biotin and SMVT). Control experiments using a biotin receptor negative cell line (WI-38) are also carried out to confirm that the specific interaction between the SMVTs and biotin is mainly responsible for the selective uptake of the photosensitizer. Efficient killing of cancerous cells is demonstrated upon light irradiation through the generation of singlet oxygen and other reactive oxygen species around the cellular environment.

Graphical abstract: Biotin-decorated NIR-absorbing nanosheets for targeted photodynamic cancer therapy

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Supplementary files

Article information


Submitted
01 Jan 2021
Accepted
09 Mar 2021
First published
09 Mar 2021

Org. Biomol. Chem., 2021,19, 2804-2810
Article type
Paper

Biotin-decorated NIR-absorbing nanosheets for targeted photodynamic cancer therapy

D. Perumal, M. Golla, K. S. Pillai, G. Raj, A. Krishna P. K. and R. Varghese, Org. Biomol. Chem., 2021, 19, 2804
DOI: 10.1039/D1OB00002K

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