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Zhang, Tong ; Ghosh, Arindam ; Behringer-Pließ, Lisa ; Chouhan, Lata ; Cunha, Ana V. ; Havenith, Remco W. A. ; Butkevich, Eugenia ; Zhang, Lei ; Vázquez, Olalla ; Debroye, Elke ; Enderlein, Jörg ; Das, Shoubhik:
Proton Tunneling Allows a Proton-Coupled Electron Transfer Process in the Cancer Cell.
In: JACS Au.
(2024)
.
ISSN 2691-3704
DOI: https://doi.org/10.1021/jacsau.4c00815
Abstract
Proton-coupled electron transfer (PCET) is a fundamental redox process and has clear advantages in selectively activating challenging C–H bonds in many biological processes. Intrigued by this activation process, we aimed to develop a facile PCET process in cancer cells by modulating proton tunneling. This approach should lead to the design of an alternative photodynamic therapy (PDT) that depletes the mitochondrial electron transport chain (ETC), the key redox regulator in cancer cells under hypoxia. To observe this depletion process in the cancer cell, we monitored the oxidative-stress-induced depolarization of mitochondrial inner membrane potential (MMP) using fluorescence lifetime imaging microscopy (FLIM). Typically, increasing metabolic stress of cancer cells is reflected in a nontrivial change in the fluorophore’s fluorescence lifetime. After 30 min of irradiation, we observed a shift in the mean lifetime value and a drastic drop in overall fluorescence signal. In addition, our PCET strategy resulted in drastic reorganization of mitochondrial morphology from tubular to vesicle-like and causing an overall depletion of intact mitochondria in the hypodermis of C. elegans. These observations confirmed that PCET promoted ROS-induced oxidative stress. Finally, we gained a clear understanding of the proton tunneling effect in the PCET process through photoluminescence experiments and DFT calculations.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Organische Chemie I - Photo- und Elektrokatalyse für Nachhaltigkeit > Lehrstuhl Organische Chemie I - Photo- und Elektrokatalyse für Nachhaltigkeit - Univ.-Prof. Dr. Shoubhik Das |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 12 Dec 2024 09:15 |
| Letzte Änderung: | 12 Dec 2024 09:15 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/91385 |