Telomere shortening and redox imbalance have been related to the aging process. We used cultured mouse embryonic fibroblasts (MEF) isolated from mice lacking telomerase activity (Terc(-/-)) to analyze the redox balance and the functional consequences promoted by telomerase deficiency. Comparison with wild-type (WT) MEF showed that Terc(-/-) MEF had greater oxidant damage, showing higher superoxide anion and hydrogen peroxide production and lower catalase activity. Restoration of telomerase activity in Terc(-/-) MEF increased catalase expression and activity. TGF-beta1 and collagen type IV levels were higher in Terc(-/-) than in WT MEF. TGF-beta1 promoter activity decreased when Terc(-/-) MEF were incubated with exogenous catalase, suggesting that catalase deficiency is the cause of the TGF-beta1 increase. Similar results were obtained in vivo. Homogenized renal cortex from 6-month-old Terc(-/-) showed higher oxidant capacity, lower catalase activity, greater oxidative damage, and higher TGF-beta1 and fibronectin levels than that from WT mice. In summary, telomerase deficiency reduces catalase activity, determining a redox imbalance that promotes overexpression of TGF-beta1 and extracellular matrix proteins.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1016/j.freeradbiomed.2008.07.017 | DOI Listing |
Adv Sci (Weinh)
January 2025
Department of Cardiology, The First People's Hospital of Wenling, Wenling Hospital of Wenzhou Medical University, Wenling, Zhejiang, 317500, China.
Immobilizing enzymes onto solid supports having enhanced catalytic activity and resistance to harsh external conditions is considered as a promising and critical method of broadening enzymatic applications in biosensing, biocatalysis, and biomedical devices; however, it is considerably hampered by limited strategies. Here, a core-shell strategy involving a soft-core hexahistidine metal assembly (HmA) is innovatively developed and characterized with encapsulated enzymes (catalase (CAT), horseradish peroxidase, glucose oxidase (GOx), and cascade enzymes (CAT+GOx)) and hard porous shells (zeolitic imidazolate framework (ZIF), ZIF-8, ZIF-67, ZIF-90, calcium carbonate, and hydroxyapatite). The enzyme-friendly environment provided by the embedded HmA proves beneficial for enhanced catalytic activity, which is particularly effective in preserving fragile enzymes that will have been deactivated without the HmA core during the mineralization of porous shells.
View Article and Find Full Text PDFAdv Sci (Weinh)
January 2025
Frontiers Science Center for Molecular Design Breeding, Beijing Key Laboratory of Crop Genetic Improvement, College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China.
Rice is highly sensitive to cold stress, particularly at the booting stage, which significantly threatens rice production. In this study, we cloned a gene, CTB6, encoding a lipid transfer protein involved in cold tolerance at the booting stage in rice, based on our previous fine-mapped quantitative trait locus (QTL) qCTB10-2. CTB6 is mainly expressed in the tapetum and young microspores of the anther.
View Article and Find Full Text PDFAdv Sci (Weinh)
January 2025
College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China.
Bacterial keratitis (BK) is a type of corneal inflammation resulting from bacterial infection in the eye. Although nanozymes have been explored as promising materials in corneal wound healing, currently available nanozymes lack sufficient catalytic activity and the ability to penetrate bacterial biofilms, limiting their efficacy against the treatment of BK. To remedy this, ZnFe layered double hydroxide (ZnFe-LDH) nanosheets are loaded with Cu single-atom nanozymes (Cu-SAzymes) and aminated dextran (Dex-NH), resulting in the formation of the nanozyme DT-ZnFe-LDH@Cu, which possesses peroxidase (POD)-, oxidase (OXD)-, and catalase (CAT)-like catalytic activities.
View Article and Find Full Text PDFFront Vet Sci
January 2025
YiMin Ecological Agriculture Development Co., Ltd., Hengyang, China.
This study investigated the fructo-oligosaccharides (FOS) on growth performance and meat quality in broilers. Total 160 Xianghuang broilers aged 2 months were randomly assigned into 2 groups, CON (control), FOS (supplemented 0.5% fructo-oligosaccharides in diet).
View Article and Find Full Text PDFFront Genet
January 2025
Chongqing Engineering Laboratory of Green Planting and Deep Processing of Famous-Region Drug in the Three Gorges Reservoir Region, College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing, China.
Introduction: P. Y. Li is a plant used to treat respiratory diseases such as pneumonia, bronchitis, and influenza.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!