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Liu X, Lu L, Zhang N, Jiang W. Regulator-carrying dual-responsive integrated AuNP composite fluorescence probe for in situ real time monitoring apoptosis progression. Talanta 2024; 269:125507. [PMID: 38056417 DOI: 10.1016/j.talanta.2023.125507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 11/17/2023] [Accepted: 11/30/2023] [Indexed: 12/08/2023]
Abstract
Apoptosis is a typical programmed death mode with complex molecular regulation mechanisms. Developing advanced strategies to monitor apoptosis progression is conducive to disease treatment related with apoptosis. Herein, we developed a regulator-carrying dual-responsive integrated AuNP composite fluorescence probe for in situ real time monitoring apoptosis progression. The nanoprobe is constructed by modifying specially designed double-stranded DNA (dsDNA) and caspase 3-specific cleavable peptides (pep) to the surface of AuNP. After uptake by cells, the nanoprobe recognizes miRNA 21 and triggers fluorescence recovery, enabling silencing and imaging of the upstream signaling molecule miRNA 21. Once miRNA 21 is silenced, the downstream signaling molecule caspase 3 is activated and cleaves the substrate peptides, and fluorescence is restored for in situ imaging of caspase 3. The apoptosis induced by silencing miRNA 21 has been successfully implemented in HeLa and A549 cells. The expression level of miRNA 21 and corresponding changes of caspase 3 have also been effectively monitored. These results suggested this nanoprobe will be a potential tool for apoptosis-related biomedical research and clinical application.
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Affiliation(s)
- Xiaoting Liu
- Research Center of Basic Medicine, Breast Center, Jinan Central Hospital, Shandong University, 250013, Jinan, PR China; School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, PR China
| | - Ling Lu
- Research Center of Basic Medicine, Breast Center, Jinan Central Hospital, Shandong University, 250013, Jinan, PR China
| | - Nan Zhang
- Research Center of Basic Medicine, Breast Center, Jinan Central Hospital, Shandong University, 250013, Jinan, PR China.
| | - Wei Jiang
- School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, PR China.
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Su XL, Su ZR, Xu WH. The protease Lon prolongs insect lifespan by responding to reactive oxygen species and degrading mitochondrial transcription factor A. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2024; 1871:119648. [PMID: 38092136 DOI: 10.1016/j.bbamcr.2023.119648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 11/15/2023] [Accepted: 12/01/2023] [Indexed: 12/24/2023]
Abstract
Diapause is a widespread adaptation of insects that enables them to survive during unfavorable seasons and is characterized by suppressed metabolism and increased lifespan. Previous works have demonstrated that high levels of reactive oxygen species (ROS) and hypoxia-inducible factor-1α (HIF-1α) in the pupal brain of the moth Helicoverpa armigera induce diapause and extend lifespan by downregulating mitochondrial transcription factor A (TFAM). However, the molecular mechanisms of ROS-HIF-1α regulating metabolic activity to extend lifespan are still poorly understood. Here, we show that the mitochondrial abundance in diapause-type pupal brains is markedly lower than that in their nondiapause-type pupae, suggesting that ROS-HIF-1α signaling negatively regulates the number of mitochondria. The protease Lon, a major mitochondrial matrix protease, can respond to ROS signals. It is activated by transcription factor HIF-1α, which specifically binds the LON promoter to promote its expression. A high level of LON mediates the degradation of TFAM, which is a crucial factor in regulating mitochondrial abundance and metabolic activity. We believe this is the first report that a previously unrecognized regulatory pathway, ROS-HIF-1α-LON-TFAM, reduces mitochondrial activity to induce diapause, extending insect lifespan.
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Affiliation(s)
- Xiao-Long Su
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Zhi-Ren Su
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Wei-Hua Xu
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510006, China.
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Hao H, Yuan T, Li Z, Zhang C, Liu J, Liang G, Feng L, Pan Y. Curcumin analogue C66 ameliorates mouse cardiac dysfunction and structural disorders after acute myocardial infarction via suppressing JNK activation. Eur J Pharmacol 2023; 946:175629. [PMID: 36868294 DOI: 10.1016/j.ejphar.2023.175629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 02/24/2023] [Accepted: 02/27/2023] [Indexed: 03/05/2023]
Abstract
Myocardial infarction contributes to the development of cardiovascular disease, and leads to severe inflammation and health hazards. Our previous studies identified C66, a novel curcumin analogue, had pharmacological benefits in suppressing tissue inflammation. Therefore, the present study hypothesized C66 might improve cardiac function and attenuate structural remodeling after acute myocardial infarction. Administration of 5 mg/kg C66 for 4-week significantly improved cardiac function and decreased infarct size after myocardial infarction. C66 also effectively reduced cardiac pathological hypertrophy and fibrosis in non-infarct area. In vitro H9C2 cardiomyocytes, C66 also exerted the pharmacological benefits of anti-inflammatory and anti-apoptosis under hypoxic conditions Mechanistically, C66 inhibited cardiac inflammation and cardiomyocyte apoptosis by targeting on JNK phosphorylation, whereas replenishment of JNK activation abolished the cardioprotective benefits of C66 treatment. Taken together, curcumin analogue C66 inhibited the activation of JNK signaling, and possessed pharmacological benefits in alleviating myocardial infarction-induced cardiac dysfunction and pathological tissue injuries.
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Affiliation(s)
- Huiqin Hao
- Department of Pathophysiology, School of Basic Medical Sciences, Shenzhen University Medical School, China; School of Pharmaceutical Sciences, Shenzhen University Medical School, Shenzhen, Guangdong, China
| | - Tao Yuan
- Department of Pathophysiology, School of Basic Medical Sciences, Shenzhen University Medical School, China; School of Pharmaceutical Sciences, Shenzhen University Medical School, Shenzhen, Guangdong, China
| | - Zexin Li
- Department of Pathophysiology, School of Basic Medical Sciences, Shenzhen University Medical School, China
| | - Chenglin Zhang
- Department of Pathophysiology, School of Basic Medical Sciences, Shenzhen University Medical School, China
| | - Jie Liu
- Department of Pathophysiology, School of Basic Medical Sciences, Shenzhen University Medical School, China
| | - Guang Liang
- School of Pharmaceutical Sciences, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Li Feng
- Department of Cardiology, Zhongshan People's Hospital, Zhongshan, Guangdong, China.
| | - Yong Pan
- Department of Pathophysiology, School of Basic Medical Sciences, Shenzhen University Medical School, China.
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Cao GY, Yang C, Jin ZT, Wei HW, Xin C, Zheng CR, Xu JB, Huang Q, Zhang Z, Hu TH. FNDC5/irisin reduces ferroptosis and improves mitochondrial dysfunction in hypoxic cardiomyocytes by Nrf2/HO-1 Axis. Cell Biol Int 2022; 46:723-736. [PMID: 35032153 DOI: 10.1002/cbin.11763] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 12/28/2021] [Accepted: 01/08/2022] [Indexed: 11/06/2022]
Abstract
Myocardial infarction is characterized by cardiomyocyte death and mitochondrial dysfunction induced by ischemia. Ferroptosis, a novel form of cell death, has been found to play critical roles under ischemic conditions. Recently, several studies have shown that fibronectin type III domain-containing 5 (FNDC5) and its cleaved form, irisin, protect the heart against injury. However, its protective effect on ferroptosis and mitochondrial impairments is still unclear. Thus, our aim was to investigate the role of irisin in ferroptosis and mitochondrial dysfunction in cardiomyocytes under hypoxic conditions. Cardiomyocytes were treated with FNDC5 overexpression and/or irisin under normoxic and hypoxic conditions. Cell viability was assessed by CCK-8 assay. Reactive oxygen species production was evaluated by dihydroethidium staining. In addition, the intracellular ferrous iron level (Fe2+ ) and the relative concentration of MDA and ATP content were determined using an iron assay kit, lipid peroxidation assay kit and ATP bioluminescent assay kit. The SOD level in cells was measured using an ELISA kit. Furthermore, an immunoblotting assay was used to determine ferroptosis-related mitochondrial proteins. Hypoxia promoted cell death, increased ferroptosis and caused mitochondrial dysfunction in cardiomyocytes. Interestingly, FNDC5 overexpression and/or irisin administration elevated cell viability, decreased ferroptosis and reversed mitochondrial impairments induced by hypoxia. Mechanistically, FNDC5/irisin reduced ferroptosis and reversed mitochondrial impairments by Nrf2/HO-1 axis in hypoxic cardiomyocytes. Thus, we have demonstrated that FNDC5/irisin plays a protective role in ferroptosis and mitochondrial dysfunction in hypoxia-induced cardiomyocyte. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Guang-Ying Cao
- Medical College of Soochow University, Suzhou, Jiangsu,China; PLA Rocket Force Characteristic Medical Center, Beijing, China.,Anshun People's Hospital, Anshun, Guizhou, China
| | - Chao Yang
- PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Zhi-Tao Jin
- PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Han-Wen Wei
- Medical College of Soochow University, Suzhou, Jiangsu,China; PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Chao Xin
- PLA Rocket Force Characteristic Medical Center, Beijing, China
| | | | - Ji-Bing Xu
- Anshun People's Hospital, Anshun, Guizhou, China
| | - Qing Huang
- Anshun People's Hospital, Anshun, Guizhou, China
| | - Zheng Zhang
- PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Tao-Hong Hu
- PLA Rocket Force Characteristic Medical Center, Beijing, China
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Zhao F, Zou MH. Role of the Mitochondrial Protein Import Machinery and Protein Processing in Heart Disease. Front Cardiovasc Med 2021; 8:749756. [PMID: 34651031 PMCID: PMC8505727 DOI: 10.3389/fcvm.2021.749756] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 08/26/2021] [Indexed: 12/12/2022] Open
Abstract
Mitochondria are essential organelles for cellular energy production, metabolic homeostasis, calcium homeostasis, cell proliferation, and apoptosis. About 99% of mammalian mitochondrial proteins are encoded by the nuclear genome, synthesized as precursors in the cytosol, and imported into mitochondria by mitochondrial protein import machinery. Mitochondrial protein import systems function not only as independent units for protein translocation, but also are deeply integrated into a functional network of mitochondrial bioenergetics, protein quality control, mitochondrial dynamics and morphology, and interaction with other organelles. Mitochondrial protein import deficiency is linked to various diseases, including cardiovascular disease. In this review, we describe an emerging class of protein or genetic variations of components of the mitochondrial import machinery involved in heart disease. The major protein import pathways, including the presequence pathway (TIM23 pathway), the carrier pathway (TIM22 pathway), and the mitochondrial intermembrane space import and assembly machinery, related translocases, proteinases, and chaperones, are discussed here. This review highlights the importance of mitochondrial import machinery in heart disease, which deserves considerable attention, and further studies are urgently needed. Ultimately, this knowledge may be critical for the development of therapeutic strategies in heart disease.
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Affiliation(s)
- Fujie Zhao
- Center for Molecular and Translational Medicine, Georgia State University, Atlanta, GA, United States
| | - Ming-Hui Zou
- Center for Molecular and Translational Medicine, Georgia State University, Atlanta, GA, United States
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