Reactive oxygen species (ROS) are endogenously generated in live cells and essential for cell signaling. However, excess ROS generation can cause oxidative damage to biomolecules, which are implicated in various human diseases, including aging. Here, we developed an in vivo hydrogen peroxide monitoring method using a genetically encodable peroxidase (APEX2)-based system. We confirmed that APEX2 is activated by endogenous HO and generates phenoxyl radicals to produce biotinylated signals (i.e., biotin-phenol) and fluorescent signals (i.e., AmplexRed), which can be detected using a fluorescence microscope. We observed that all subcellular targeted APEX2s were activated by local HO generation by menadione treatment. Among them, the endoplasmic reticulum lumen and lysosome-targeted APEX2 showed the highest response upon addition of menadione which implies that local HO levels in those spaces are highly increased by menadione treatment. Using APEX2, we also found that a minimum amount of menadione (>10 μM) is required to generate detectable levels of HO in all subcellular compartments. We also checked the local HO-quenching effect of -acetylcysteine using our system. As APEX2 can be genetically expressed in diverse live organisms (e.g., cancer cell lines, mice, fly, worm, and yeast), our method can be effectively used to detect local generation of endogenously produced HO in diverse live models.
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http://dx.doi.org/10.1021/acs.analchem.2c01966 | DOI Listing |
Environ Sci Technol
January 2025
U.S. Environmental Protection Agency, E205-02, Research Triangle Park, P.O. Box 12055, Durham, North Carolina 27711, United States.
The complex, varied composition (i.e., rubbers/elastomers, carbon black, fillers, additives, and embedded road materials) and wide density range of tire road wear particles (TRWPs) present challenges for their isolation and identification from environmental matrices.
View Article and Find Full Text PDFJ Environ Manage
January 2025
School of Environmental Science and Engineering, Nanjing Tech University, Nanjing, 211816, China. Electronic address:
Ofloxacin (OFX), commonly employed in the treatment of infectious diseases, is frequently detected in aquatic environments and poses potential ecological risks. UV/HO oxidation has been recognized as an efficient approach for removing antibiotics. In this study, Cu-doped waste-tire carbon was prepared and used as a UV/HO catalyst for the degradation of OFX.
View Article and Find Full Text PDFCell Res
January 2025
State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, Sichuan, China.
Hydrogen peroxide (HO) is a ubiquitous signal regulating many biological processes, including innate immunity, in all eukaryotes. However, it remains largely unknown that how transcription factors directly sense HO in eukaryotes. Here, we report that rice basic/helix-loop-helix transcription factor bHLH25 directly senses HO to confer resistance to multiple diseases caused by fungi or bacteria.
View Article and Find Full Text PDFZhongguo Zhong Yao Za Zhi
December 2024
School of Medicine, Jianghan University Wuhan 430056, China.
This study aims to investigate the mechanism of tanshinone Ⅱ_A(Tan Ⅱ_A) in protecting mice from diethylinitrosamine(DEN)/carbon tetrachloride(CCl_4)/ethanol(C_2H_5OH)-induced hepatocellular carcinoma(HCC) and HepG2 cells from hydrogen peroxide(H_2O_2)-induced oxidative damage via the phosphoinositide 3-kinase(PI3K)/protein kinase B(Akt) and nuclear factor E2-related factor 2(Nrf2)/heme oxygenase 1(HO-1) signaling pathways. Sixty male C57BL/6J mice were grouped as follows: control, model, low, medium, and high-dose(10, 20, 40 mg·kg~(-1), respectively) Tan Ⅱ_A, and colchicine(0.2 mg·kg~(-1)), with 10 mice in each group.
View Article and Find Full Text PDFPlant Sci
January 2025
College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China. Electronic address:
Reactive oxygen species (ROS) serve as important signaling molecule, involved in numerous biological processes, particularly in the physiological changes associated with fruit ripening and postharvest handing. This review explores ROS key role in plant fruit ripening and postharvest quality. The mechanism of ROS production and degradation in maintaining ROS homeostasis are analyzed in detail.
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