A Water-Soluble Octahedral Molybdenum Cluster Complex as a Potential Agent for X-Ray Induced Photodynamic Therapy

2021 ◽  
Author(s):  
Kaplan Kirakci ◽  
Tatyana Pozmogova ◽  
Andrey Y Protasevich ◽  
Georgy D Vavilov ◽  
Dmitri Stass ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Photodynamic Therapy ◽  
Reactive Oxygen ◽  
Water Soluble ◽  
Cluster Complex ◽  
Oxygen Species ◽  
X Ray ◽  
Molybdenum Cluster

X-ray-induced photodynamic therapy (X-PDT) has recently evolved into a suitable modality to fight cancer. This technique, which exploits radiosensitizers producing reactive oxygen species, allows for a reduction of the radiation...

scholarly journals Rare-Earth-Doped Calcium Carbonate Exposed to X-ray Irradiation to Induce Reactive Oxygen Species for Tumor Treatment

2019 ◽  
Vol 20 (5) ◽  
pp. 1148 ◽  
Author(s):  
Chun-Chen Yang ◽  
Wei-Yun Wang ◽  
Feng-Huei Lin ◽  
Chun-Han Hou
Keyword(s):  
Reactive Oxygen Species ◽  
Photodynamic Therapy ◽  
Tumor Growth ◽  
Light Source ◽  
Reactive Oxygen ◽  
Blood Analysis ◽  
Oxygen Species ◽  
Tumor Treatment ◽  
X Ray

Conventional photodynamic therapy (PDT) is limited by its penetration depth due to the photosensitizer and light source. In this study, we developed X-ray induced photodynamic therapy that applied X-ray as the light source to activate Ce-doped CaCO3 (CaCO3:Ce) to generate an intracellular reactive oxygen species (ROS) for killing cancer cells. The A549 cell line was used as the in vitro and in vivo model to evaluate the efficacy of X-ray-induced CaCO3:Ce. The cell viability significantly decreased and cell cytotoxicity obviously increased with CaCO3:Ce exposure under X-ray irradiation, which is less harmful than radiotherapy in tumor treatment. CaCO3:Ce produced significant ROS under X-ray irradiation and promoted A549 cancer cell death. CaCO3:Ce can enhance the efficacy of X-ray induced PDT, and tumor growth was inhibited in vivo. The blood analysis and hematoxylin and eosin stain (H&E) stain fully supported the safety of the treatment. The mechanisms underlying ROS and CO2 generation by CaCO3:Ce activated by X-ray irradiation to induce cell toxicity, thereby inhibiting tumor growth, is discussed. These findings and advances are of great importance in providing a novel therapeutic approach as an alternative tumor treatment.

scholarly journals Carbon-Doped TiO2 Activated by X-Ray Irradiation for the Generation of Reactive Oxygen Species to Enhance Photodynamic Therapy in Tumor Treatment

2019 ◽  
Vol 20 (9) ◽  
pp. 2072 ◽  
Author(s):  
Chun-Chen Yang ◽  
Min-Hsiung Tsai ◽  
Keng-Yuan Li ◽  
Chun-Han Hou ◽  
Feng-Huei Lin
Keyword(s):  
Reactive Oxygen Species ◽  
Photodynamic Therapy ◽  
Band Gap ◽  
Penetration Depth ◽  
Light Source ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
X Rays ◽  
Tumor Treatment ◽  
X Ray

Traditional photodynamic therapy (PDT) is limited by the penetration depth of visible light. Although the light source has been changed to near infrared, infrared light is unable to overcome the penetration barrier and it is only effective at the surface of the tumors. In this study, we used X-ray as a light source for deep-seated tumor treatment. A particle with a narrow band gap when exposed to soft X-rays would produce reactive oxygen species (ROS) to kill tumor cell, with less damage to the normal tissues. Anatase TiO2 has been studied as a photosensitizer in PDT. In the experiment, C was doped into the anatase lattice at an optimum atomic ratio to make the band gap narrower, which would be activated by X-ray to produce more ROS and kill tumor cells under stress. The results showed that the synthesized TiO2:C particles were identified as crystal structures of anatase. The synthesized particles could be activated effectively by soft X-rays to produce ROS, to degrade methylene blue by up to 30.4%. Once TiO2:C was activated by X-ray irradiation, the death rate of A549 cells in in vitro testing was as high as 16.57%, on day 2. In the animal study, the tumor size gradually decreased after treatment with TiO2:C and exposure to X-rays on day 0 and day 8. On day 14, the tumor declined to nearly half of its initial volume, while the tumor in the control group was twice its initial volume. After the animal was sacrificed, blood, and major organs were harvested for further analysis and examination, with data fully supporting the safety of the treatment. Based on the results of the study, we believe that TiO2:C when exposed to X-rays could overcome the limitation of penetration depth and could improve PDT effects by inhibiting tumor growth effectively and safely, in vivo.

scholarly journals Homologous Adaptation to Oxidative Stress Induced by the Photosensitized Pd-bacteriochlorophyll Derivative (WST11) in Cultured Endothelial Cells

2004 ◽  
Vol 279 (44) ◽  
pp. 45713-45720 ◽  
Author(s):  
Vicki Plaks ◽  
Yehudit Posen ◽  
Ohad Mazor ◽  
Alex Brandis ◽  
Avigdor Scherz ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Reactive Oxygen Species ◽  
Endothelial Cells ◽  
Photodynamic Therapy ◽  
Reactive Oxygen ◽  
Water Soluble ◽  
Oxygen Species ◽  
Adaptive Responses ◽  
Cellular Mechanisms ◽  
Mapk Activity

Various forms of cellular stress induce adaptive responses through poorly understood mechanisms. In maintaining homeostasis, endothelial cells respond and adapt to changes in oxidative stress that prevail in the circulation. Endothelial cells are also the target of many oxidative stress-based vascular therapies. The objectives of this study were to determine whether endothelial cells adapt to oxidative stress induced upon the photosensitization of WST11 (a water-soluble Pd-bacteriochlorophyll derivative being developed as a photodynamic agent) and to study possible cellular mechanisms involved. The hallmark of WST11-based photodynamic therapy is thein situgeneration of cytotoxic reactive oxygen species causing vascular shutdown, hypoxia, and tumor eradication. Here we demonstrated that photodynamic therapy also induces adaptive responses and tolerance following a sublethal preconditioning of endothelial cells with the same (homologous) or different (heterologous) stressor. A link among p38 MAPK activity, expression of hsp70 and hsp27, and homologous adaptation to reactive oxygen species induced by photosensitized WST11 was established. In addition to characterization of some key proteins involved, our observations provide a beneficial new working tool for the studies of mechanisms involved in oxidative stress and adaptation using light-controlled photosensitization.

scholarly journals Nanocomposites for X-Ray Photodynamic Therapy

2020 ◽  
Vol 21 (11) ◽  
pp. 4004 ◽  
Author(s):  
Zaira Gadzhimagomedova ◽  
Peter Zolotukhin ◽  
Oleg Kit ◽  
Daria Kirsanova ◽  
Alexander Soldatov
Keyword(s):  
Reactive Oxygen Species ◽  
Photodynamic Therapy ◽  
Metal Organic Frameworks ◽  
Reactive Oxygen ◽  
Modern Medicine ◽  
Oxygen Species ◽  
X Rays ◽  
X Ray ◽  
Metal Organic ◽  
Cancer Tissues

Photodynamic therapy (PDT) has long been known as an effective method for treating surface cancer tissues. Although this technique is widely used in modern medicine, some novel approaches for deep lying tumors have to be developed. Recently, deeper penetration of X-rays into tissues has been implemented, which is now known as X-ray photodynamic therapy (XPDT). The two methods differ in the photon energy used, thus requiring the use of different types of scintillating nanoparticles. These nanoparticles are known to convert the incident energy into the activation energy of a photosensitizer, which leads to the generation of reactive oxygen species. Since not all photosensitizers are found to be suitable for the currently used scintillating nanoparticles, it is necessary to find the most effective biocompatible combination of these two agents. The most successful combinations of nanoparticles for XPDT are presented. Nanomaterials such as metal–organic frameworks having properties of photosensitizers and scintillation nanoparticles are reported to have been used as XPDT agents. The role of metal–organic frameworks for applying XPDT as well as the mechanism underlying the generation of reactive oxygen species are discussed.

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