Unexpected Role of Ru(II) Orbital and Spin Contribution on Photoinduced Ligand Exchange: New Mechanism To Access the Photodynamic Therapy Window

2019 ◽  
Vol 123 (16) ◽  
pp. 10291-10299 ◽  
Author(s):  
Lauren M. Loftus ◽  
Kathlyn F. Al-Afyouni ◽  
Thomas N. Rohrabaugh ◽  
Judith C. Gallucci ◽  
Curtis E. Moore ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Ligand Exchange ◽  
Spin Contribution

scholarly journals Cytotoxicity of cyclometallated ruthenium complexes: the role of ligand exchange on the activity

2013 ◽  
Vol 371 (1995) ◽  
pp. 20120135 ◽  
Author(s):  
Alycia M. Palmer ◽  
Bruno Peña ◽  
R. Bryan Sears ◽  
Olivia Chen ◽  
Maya El Ojaimi ◽  
...  
Keyword(s):  
Cell Death ◽  
Photodynamic Therapy ◽  
Charge Transfer ◽  
Dna Binding ◽  
Coordination Sphere ◽  
Ligand Exchange ◽  
Ligand Substitution ◽  
Tissue Penetration ◽  
Ligand Charge Transfer

The cyclometallated Ru(II) complexes cis -[Ru(phpy)(phen)(CH 3 CN) 2 ](PF 6 ) ( 1 ; phpy − =deprotonated 2-phenylpyridine, phen=1,10-phenanthroline) and cis -[Ru(phpy)(bpy)(CH 3 CN) 2 ](PF 6 ) ( 2 ; bpy=2,2′-bipyridine) were investigated as potential agents for photodynamic therapy. The presence of phpy − in the coordination sphere results in a red-shift of the Ru→phen and Ru→bpy metal-to-ligand charge transfer of 1 and 2 , respectively, thus improving the tissue penetration of light while maintaining the efficient photo-induced ligand exchange required for DNA binding. The 14-fold enhancement of OVCAR-5 cell death that occurs upon irradiation with 690 nm light can be attributed to photo-aquation. The role of glutathione (GSH) on the toxicity of the complex was also explored. Complexes 1 and 2 undergo ligand substitution in the presence of GSH in the dark, such that the metal may covalently bind to biomolecules. The combination of photo-induced ligand exchange and GSH-facilitated ligand exchange may explain the observed cytotoxicity.

Role of Exosomes in Photodynamic Anticancer Therapy

2020 ◽  
Vol 27 (40) ◽  
pp. 6815-6824 ◽  
Author(s):  
Yuan Jiang ◽  
Chuanshan Xu ◽  
Wingnang Leung ◽  
Mei Lin ◽  
Xiaowen Cai ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Basic Principle ◽  
Photochemical Reaction ◽  
Cell Communication ◽  
Anticancer Therapy ◽  
Bioactive Molecules ◽  
Promising Alternative ◽  
Tumor Tissues ◽  
Significant Attention

Photodynamic Therapy (PDT) is a promising alternative treatment for malignancies based on photochemical reaction induced by Photosensitizers (PS) under light irradiation. Recent studies show that PDT caused the abundant release of exosomes from tumor tissues. It is well-known that exosomes as carriers play an important role in cell-cell communication through transporting many kinds of bioactive molecules (e.g. lipids, proteins, mRNA, miRNA and lncRNA). Therefore, to explore the role of exosomes in photodynamic anticancer therapy has been attracting significant attention. In the present paper, we will briefly introduce the basic principle of PDT and exosomes, and focus on discussing the role of exosomes in photodynamic anticancer therapy, to further enrich and boost the development of PDT.

scholarly journals 066 Role of TGF-β1 in the resistance of squamous cell carcinoma to photodynamic therapy

2021 ◽  
Vol 141 (5) ◽  
pp. S12
Author(s):  
M. Gallego Rentero ◽  
M. Gutiérrez-Pérez ◽  
M. Portillo-Esnaola ◽  
M. Mataix ◽  
L. Najera ◽  
...  
Keyword(s):  
Squamous Cell Carcinoma ◽  
Photodynamic Therapy ◽  
Cell Carcinoma ◽  
Squamous Cell ◽  
Tgf Β1

A first-principles study of the atomic layer deposition of ZnO on carboxyl functionalized carbon nanotubes: the role of water molecules

2021 ◽  
Vol 23 (5) ◽  
pp. 3467-3478
Author(s):  
J. I. Paez-Ornelas ◽  
H. N. Fernández-Escamilla ◽  
H. A. Borbón-Nuñez ◽  
H. Tiznado ◽  
Noboru Takeuchi ◽  
...  
Keyword(s):  
First Principles ◽  
Ligand Exchange ◽  
Functional Group ◽  
Atomic Layer ◽  
High Reactivity ◽  
Water Molecules ◽  
Exchange Reactions ◽  
Layer Deposition ◽  
The Right

Atomic description of ALD in systems that combine large surface area and high reactivity is key for selecting the right functional group to enhance the ligand-exchange reactions.

The role of dynamics in modulating ligand exchange in intracellular lipid binding proteins

2014 ◽  
Vol 1844 (7) ◽  
pp. 1268-1278 ◽  
Author(s):  
Laura Ragona ◽  
Katiuscia Pagano ◽  
Simona Tomaselli ◽  
Filippo Favretto ◽  
Alberto Ceccon ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Binding Proteins ◽  
Lipid Binding ◽  
Intracellular Lipid ◽  
Lipid Binding Proteins

Combination of photodynamic therapy with doxorubicin in osteosarcoma: Cell death and the role of oxidative stress

2016 ◽  
Vol 61 ◽  
pp. S141
Author(s):  
B. Serambeque ◽  
G. Brites ◽  
M. Laranjo ◽  
G. Chohfi de Miguel ◽  
A. Serra ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Cell Death ◽  
Photodynamic Therapy ◽  
Osteosarcoma Cell

The role of photodynamic therapy in the management of stage I/II NSCLC

Lung Cancer ◽  
2001 ◽  
Vol 34 ◽  
pp. 35-38 ◽  
Author(s):  
G. Sutedja ◽  
P.E. Postmus
Keyword(s):  
Photodynamic Therapy ◽  
Stage I

scholarly journals Use of Photodynamic Therapy for Treatment of Actinic Keratoses in Organ Transplant Recipients

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Christina Wlodek ◽  
Faisal R. Ali ◽  
John T. Lear
Keyword(s):  
Photodynamic Therapy ◽  
Organ Transplant ◽  
Solid Organ ◽  
Transplant Recipients ◽  
Actinic Keratoses ◽  
Organ Transplant Recipients ◽  
Skin Cancers ◽  
Effective Treatment Modality ◽  
Nonmelanoma Skin Cancers

Solid organ transplant recipients are predisposed to actinic keratoses (AK) and nonmelanoma skin cancers, owing to the lifelong immunosuppression required. Today, increasing numbers of organ transplants are being performed and organ transplant recipients (OTRs) are surviving much longer. Photodynamic therapy (PDT) is proving a highly effective treatment modality for AK amongst this susceptible group of patients. Following an overview of the pathogenesis of AK amongst OTRs, the authors review current safety and efficacy data and how this relates to the role of PDT for the treatment of AK in OTRs.

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