4.5 Article

Introducing the Tellurophene-Appended BODIPY: PDT Agent with Mass Cytometry Tracking Capabilities

Journal

ACS MEDICINAL CHEMISTRY LETTERS
Volume 12, Issue 12, Pages 1925-1931

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsmedchemlett.1c00492

Keywords

Suzuki-coupled tellurophene; dual mass cytometry and PDT; singlet oxygen

Funding

  1. NSERC of Canada [510963]
  2. Queen Elizabeth II - Graduate Scholarship in Science and Technology

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This study reported the synthesis and characterization of a BODIPY appended to a five-membered heterocyclic tellurophene moiety, which acts as a potent photosensitizer with a mass cytometry tag. Through late-stage Suzuki-Miyaura coupling, the tellurophene-appended BODIPY was successfully synthesized, demonstrating high singlet oxygen quantum yield and cytotoxicity.
The synthesis and characterization of the first BODIPY appended to the five-membered heterocylic tellurophene [Te] moiety is reported. By incorporating tellurophene at the meso position, the tellurophene-appended boron-dipyrromethene dye (BODIPY) acts as a multimodal agent, becoming a potent photosensitizer with a mass cytometry tag. To synthesize the compound, we developed a method to enable late-stage Suzuki-Miyaura coupling by preparing and isolating tellurophene-2-BPin in a one-step procedure from the parent tellurophene. Coupling to a meso-substituted BODIPY functionalized with a pendant aryl bromide provides the desired tellurophene-appended BODIPY. This compound demonstrated a singlet oxygen quantum yield of 0.26 +/- 0.01 and produced a light dose-dependent cytotoxicity with nanomolar IC50 values against 2D cultured HeLa cells and high efficacy against 3D cultured HeLa tumor spheroids, proving to be a strong photosensitizer. The presence of the tellurophene moiety could be detected using mass cytometry, thus showcasing the ability of a tellurophene-appended BODIPY as a novel photodynamic-therapy- mass-cytometry theranostic agent.

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