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Zhu J, Wang Q, Zheng Z, Ma L, Guo J, Shi H, Ying R, Gao B, Chen S, Yu S, Yuan B, Peng X, Ge J. MiR-181a protects the heart against myocardial infarction by regulating mitochondrial fission via targeting programmed cell death protein 4. Sci Rep 2024; 14:6638. [PMID: 38503934 PMCID: PMC10951332 DOI: 10.1038/s41598-024-57206-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 03/15/2024] [Indexed: 03/21/2024] Open
Abstract
Worldwide, myocardial infarction (MI) is the leading cause of death and disability-adjusted life years lost. Recent researches explored new methods of detecting biomarkers that can predict the risk of developing myocardial infarction, which includes identifying genetic markers associated with increased risk. We induced myocardial infarction in mice by occluding the left anterior descending coronary artery and performed TTC staining to assess cell death. Next, we performed ChIP assays to measure the enrichment of histone modifications at the promoter regions of key genes involved in mitochondrial fission. We used qPCR and western blot to measure expression levels of relative apoptotic indicators. We report that miR-181a inhibits myocardial ischemia-induced apoptosis and preserves left ventricular function after MI. We show that programmed cell death protein 4 (PDCD4) is the target gene involved in miR-181a-mediated anti-ischemic injury, which enhanced BID recruitment to the mitochondria. In addition, we discovered that p53 inhibits the expression of miR-181a via transcriptional regulation. Here, we discovered for the first time a mitochondrial fission and apoptosis pathway which is controlled by miR-181a and involves PDCD4 and BID. This pathway may be controlled by p53 transcriptionally, and we presume that miR-181a may lead to the discovery of new therapeutic and preventive targets for ischemic heart diseases.
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Affiliation(s)
- Jianbing Zhu
- Department of Cardiology, The First Affiliated Hospital of Nanchang University, Nanchang, China.
- Jiangxi Hypertension Research Institute, Nanchang, China.
| | - Qian Wang
- Department of Blood Transfusion, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Zeqi Zheng
- Department of Cardiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
- Jiangxi Hypertension Research Institute, Nanchang, China
| | - Leilei Ma
- Department of Cardiology, Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Junjie Guo
- Department of Cardiology, Affiliated Hospital of Qingdao University, Qingdao, China
| | - Hongtao Shi
- Department of Cardiology, Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Ru Ying
- Department of Cardiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
- Jiangxi Hypertension Research Institute, Nanchang, China
| | - Beilei Gao
- Department of Cardiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
- Jiangxi Hypertension Research Institute, Nanchang, China
| | - Shanshan Chen
- Department of Cardiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
- Jiangxi Hypertension Research Institute, Nanchang, China
| | - Siyang Yu
- Department of Cardiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
- Jiangxi Hypertension Research Institute, Nanchang, China
| | - Bin Yuan
- Department of Cardiovascular Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Xiaoping Peng
- Department of Cardiology, The First Affiliated Hospital of Nanchang University, Nanchang, China.
- Jiangxi Hypertension Research Institute, Nanchang, China.
| | - Junbo Ge
- Department of Cardiology, Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China.
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Du Y, Lai J, Su J, Li J, Li C, Zhu B, Li Y. Naringenin-induced Oral Cancer Cell Apoptosis Via ROS-mediated Bid and Bcl-xl Signaling Pathway. Curr Cancer Drug Targets 2024; 24:CCDT-EPUB-136103. [PMID: 38178673 DOI: 10.2174/0115680096267430231023091521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 08/21/2023] [Accepted: 09/13/2023] [Indexed: 01/06/2024]
Abstract
BACKGROUND Oral cancer is a malignant tumor with a high impact and poor prognosis. Naringenin, a flavonoid found in citrus fruits and its anti-inflammatory and antioxidant properties offer potential therapeutic benefits. However, limited studies have been conducted on the impact of naringenin on human tongue carcinoma CAL-27 cells. This study aims to elucidate the correlation between naringenin and tongue cancer, thereby identifying a potential therapeutic candidate for drug intervention against tongue cancer. METHODS The effect of naringenin on the apoptosis of CAL-27 cells and its mechanism were studied by cell counting kit-8, mitochondrial membrane potential assay with JC-1, Annexin V-- FITC apoptosis detection, cell cycle, and apoptosis analysis, Reactive Oxygen Species assay and Western blot. RESULTS The results showed that naringenin significantly induced apoptosis in CAL-27 cells in a dose-dependent manner. Mechanistically, naringenin-induced apoptosis was mediated through the upregulation of Bid and downregulation of Bcl-xl, which led to increased generation of ROS. CONCLUSION The findings suggested that naringenin may represent a promising candidate for the treatment of oral cancer by inducing apoptotic cell death via modulation of the Bid and Bcl-xl signaling pathways.
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Affiliation(s)
- YuYe Du
- Department of Kashan Outpatient Clinic, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, Guangdong510182, China
| | - Jia Lai
- Center Laboratory, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, No 318 Renminzhong Road, Yuexiu District, Guangzhou, 510120, China
| | - Jingyao Su
- Center Laboratory, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, No 318 Renminzhong Road, Yuexiu District, Guangzhou, 510120, China
| | - Jiali Li
- Center Laboratory, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, No 318 Renminzhong Road, Yuexiu District, Guangzhou, 510120, China
| | - Chuqing Li
- Center Laboratory, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, No 318 Renminzhong Road, Yuexiu District, Guangzhou, 510120, China
| | - Bing Zhu
- Center Laboratory, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, No 318 Renminzhong Road, Yuexiu District, Guangzhou, 510120, China
| | - Yinghua Li
- Center Laboratory, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, No 318 Renminzhong Road, Yuexiu District, Guangzhou, 510120, China
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3
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Bera A, Singh S, D'Souza JS, Hosur RV, Mishra P. Effect of UV Stress on the Structure and Function of Pro-apoptotic Bid and Anti-apoptotic Bcl-xl proteins. Chembiochem 2023; 24:e202200682. [PMID: 36597005 DOI: 10.1002/cbic.202200682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 12/31/2022] [Accepted: 01/02/2023] [Indexed: 01/05/2023]
Abstract
Ultraviolet C (UV-C) radiation induces apoptosis in mammalian cells via the mitochondrion-mediated pathway. The Bcl-2 family of proteins are the regulators of the mitochondrial pathway of apoptosis and appears responsive to UV-C radiation. It is unknown how the structure and, effectively, the function of these proteins are directly impacted by UV-C exposure. Here, we present the effect of UV-C irradiation on the structure and function of pro-apoptotic Bid-FL and anti-apoptotic Bcl-xlΔC proteins. Using a variety of biophysical tools, we show that, following UV-C irradiation, the structures of Bcl-xlΔC and Bid-FL are irreversibly altered. Bcl-xLΔC is found to be more sensitive to UV stress than Bid-FL Interestingly, UV-C exposure shows dramatic chemical shift perturbations in consequence of dramatic structural perturbations (α-helix to β-sheet) in the BH3- binding region, a crucial segment of Bcl-xlΔC. Furter it has been shown that UV-exposed Bcl-xlΔC has reduced efficacy of its interactions with pro-apoptotic tBid.
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Affiliation(s)
- Akash Bera
- Department of Biophysics, University of Mumbai Santacruz (E) Kalina, Mumbai, 400101, India
| | - Suraj Singh
- Department of Biophysics, University of Mumbai Santacruz (E) Kalina, Mumbai, 400101, India
| | - Jacinta S D'Souza
- Department of Biology, UM-DAE Centre for Excellence in Basic Sciences Santacruz (E) Kalina, Mumbai, 400101, India
| | - Ramakrishna V Hosur
- Department of Biology, UM-DAE Centre for Excellence in Basic Sciences Santacruz (E) Kalina, Mumbai, 400101, India
| | - Pushpa Mishra
- Department of Biophysics, University of Mumbai Santacruz (E) Kalina, Mumbai, 400101, India
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Bashir S, Banday M, Qadri O, Pal D, Bashir A, Hilal N, Altaf M, Fazili KM. The Bcl-2 family protein bid interacts with the ER stress sensor IRE1 to differentially modulate its RNase activity. FEBS Lett 2023; 597:962-974. [PMID: 36723387 DOI: 10.1002/1873-3468.14593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 01/17/2023] [Accepted: 01/19/2023] [Indexed: 02/02/2023]
Abstract
IRE1 is a transmembrane signalling protein that activates the unfolded protein response under endoplasmic reticulum stress. IRE1 is endowed with kinase and endoribonuclease activities. The ribonuclease activity of IRE1 can switch substrate specificities to carry out atypical splicing of Xbp1 mRNA or trigger the degradation of specific mRNAs. The mechanisms regulating the distinct ribonuclease activities of IRE1 have yet to be fully understood. Here, we report the Bcl-2 family protein Bid as a novel recruit of the IRE1 complex, which directly interacts with the cytoplasmic domain of IRE1. Bid binding to IRE1 leads to a decrease in IRE1 phosphorylation in a way that it can only perform Xbp1 splicing while mRNA degradation activity is repressed. The RNase outputs of IRE1 have been found to regulate the homeostatic-apoptotic switch. This study, thus, provides insight into IRE1-mediated cell survival.
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Affiliation(s)
- Samirul Bashir
- Department of Biotechnology, University of Kashmir, Hazratbal J&K, India
| | - Mariam Banday
- Department of Biotechnology, University of Kashmir, Hazratbal J&K, India
| | - Ozaira Qadri
- Department of Biotechnology, University of Kashmir, Hazratbal J&K, India
| | - Debnath Pal
- Department of Computational and Data Science (CDS), Indian Institute of Science (IISc), Bengaluru, India
| | - Arif Bashir
- Department of Biotechnology, University of Kashmir, Hazratbal J&K, India
| | - Nazia Hilal
- Department of Biotechnology, University of Kashmir, Hazratbal J&K, India
| | - Mohammad Altaf
- Department of Biotechnology, University of Kashmir, Hazratbal J&K, India
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Kim JH, Najy AJ, Li J, Luo X, Kim HRC, Choudry MHA, Lee YJ. Involvement of Bid in the crosstalk between ferroptotic agent-induced ER stress and TRAIL-induced apoptosis. J Cell Physiol 2022; 237:4180-4196. [PMID: 35994698 PMCID: PMC9691566 DOI: 10.1002/jcp.30863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 08/04/2022] [Accepted: 08/10/2022] [Indexed: 11/10/2022]
Abstract
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) induces death receptor-mediated extrinsic apoptosis, specifically in cancer cells, and Bid (BH3-interacting domain death agonist) plays an important role in TRAIL-induced apoptosis. Ferroptosis is a newly defined form of regulated cell death known to be distinct from other forms of cell death. However, our previous studies have shown that ferroptosis shares common pathways with other types of programmed cell death such as apoptosis. In this study, we investigated the role of Bid in the crosstalk between the ferroptotic agent-induced endoplasmic reticulum (ER) stress response and TRAIL-induced apoptosis. When human colorectal carcinoma HCT116 cells were treated with the ferroptosis-inducing agents artesunate and erastin in combination with TRAIL, TRAIL-induced activation of caspase-8 was enhanced, and subsequently, the truncation of Bid was increased. Similar results were observed when ovarian adenocarcinoma OVCAR-3 cells were treated with the ferroptotic agents in combination with TRAIL. Results from studies with Bid mutants reveal that the truncation of Bid and the presence of intact BH3 domains are critical for synergistic apoptosis. Nonfunctional Bid mutants were not able to activate the mitochondria-dependent apoptosis pathway, which is required for the conversion of p19 to p17, the active form of caspase-3. These results indicate that Bid plays a critical role in the crosstalk between the ferroptotic agent-induced ER stress response and TRAIL-induced apoptosis.
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Affiliation(s)
- Jin Hong Kim
- Department of Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Abdo J. Najy
- Department of Pathology, Barbara Ann Karmanos Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA
- Department of Oncology, Barbara Ann Karmanos Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Jian Li
- Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198, USA
| | - Xu Luo
- Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198, USA
| | - Hyeong-Reh C. Kim
- Department of Pathology, Barbara Ann Karmanos Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA
- Department of Oncology, Barbara Ann Karmanos Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - M. Haroon A. Choudry
- Department of Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Yong J. Lee
- Department of Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
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6
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Forouzesh F, Kia FS, Nazemalhosseini-Mojarad E. BidSi6 and BidEL isoforms as a potential marker for predicting colorectal adenomatous polyps. BMC Med Genomics 2022; 15:129. [PMID: 35668495 PMCID: PMC9172139 DOI: 10.1186/s12920-022-01282-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 06/02/2022] [Indexed: 11/26/2022] Open
Abstract
Background As a well-known protein, Bid links the extrinsic and intrinsic apoptotic pathways and plays important roles in cell proliferation. In this study, we evaluated the expression of two isoforms of the Bid gene (BidSi6 and BidEL) in colorectal adenomatous polyps as a biomarker and investigated the relationship between their expression levels with clinicopathological factors. Methods The expression of BidSi6 and BidEL isoforms in 22 pairs of Adenomatous polyps and adjust non-polyp tissues was measured by qReal-Time PCR and compared with 10 normal colon tissues. ROC curve was performed to examine the diagnostic capacity. Also, sequencing was performed for molecular identification of BidSi6 isoform in adenomatous polyp. Results Our results showed that BidSi6 and BidEL isoforms were significantly overexpressed in Adenomatous polyps and non-polyp adjacent tissues from the same patients compared to that in normal colon tissues, but there was no significant expression between polyps and adjust non-polyp tissues. There were no significant correlations between the expression of two isoforms and other features of clinicopathology. The area under the curve of BidSi6 and BidEL isoforms indicated powerful diagnostic capability. The phylogenetic tree was constructed based on the sequence of idSi6 isoform, and the results showed that adenomatous polyp tissue and adjust non-polyp tissue were separated from healthy colorectal tissue and reference sequence (EU678292). Conclusions These findings suggest that BidSi6 and BidEL isoforms can be used as new potential biomarkers in adenomatous polyps. Supplementary Information The online version contains supplementary material available at 10.1186/s12920-022-01282-0.
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Affiliation(s)
- Flora Forouzesh
- Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, P.O. Box: 193951495, Tehran, Iran.
| | - Fatemeh Sadat Kia
- Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, P.O. Box: 193951495, Tehran, Iran
| | - Ehsan Nazemalhosseini-Mojarad
- Department of Cancer, Gastroenterology and Liver Disease Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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7
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Cui XZ, Zheng MX, Yang SY, Bai R, Zhang L. Roles of calpain in the apoptosis of Eimeria tenella host cells at the middle and late developmental stages. Parasitol Res 2022; 121:1639-1649. [PMID: 35412077 DOI: 10.1007/s00436-022-07496-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Accepted: 03/14/2022] [Indexed: 11/26/2022]
Abstract
This study investigated the role of calpain in Eimeria tenella-induced host cell apoptosis. Chick embryo cecal epithelial cell culture technology, flow cytometry, enzyme-linked immunosorbent assays, and fluorescence quantitative PCR were used to detect the E. tenella host cell apoptotic rate, Bax and Bid expression levels, and calpain activity. The results demonstrated that Bax, Bid, and calpain levels were upregulated and apoptosis was increased following E. tenella infection at 24-120 h. Calpain levels were reduced by pharmacological inhibition of calpain using SJA6017 or by blocking Ca2+ entry into the cell using BAPTA/AM at 24-120 h. The mRNA and protein levels of Bax and Bid, the E. tenella infection rate, and the early apoptotic and late apoptotic (necrosis) rates were decreased by using SJA6017 at 24-120 h. These results indicated that E. tenella-promoted host cell apoptosis is regulated by calpain via Bid and Bax at 24-120 h. Thus, manipulation of calpain levels could be used to manage E. tenella infection in chickens in the middle and late developmental stages.
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Affiliation(s)
- Xiao-Zhen Cui
- College of Animal Medicine, Shanxi Agriculture University, Taiyuan, Shanxi Province, 030036, People's Republic of China
| | - Ming-Xue Zheng
- College of Animal Medicine, Shanxi Agriculture University, Taiyuan, Shanxi Province, 030036, People's Republic of China.
| | - Shi-Yu Yang
- Department of Clinical Neurosciences, UCL Institute of Neurology, Rowland Hill Street, London, NW3 2PF, UK
| | - Rui Bai
- College of Animal Medicine, Shanxi Agriculture University, Taiyuan, Shanxi Province, 030036, People's Republic of China
| | - Li Zhang
- College of Animal Medicine, Shanxi Agriculture University, Taiyuan, Shanxi Province, 030036, People's Republic of China
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8
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Singh S, Barnes CA, D'Souza JS, Hosur RV, Mishra P. Curcumin, a potential initiator of apoptosis via direct interactions with Bcl-xL and Bid. Proteins 2021; 90:455-464. [PMID: 34528298 DOI: 10.1002/prot.26238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 08/18/2021] [Accepted: 09/07/2021] [Indexed: 11/07/2022]
Abstract
Apoptosis is a naturally occurring process during the growth and development of multicellular organisms and is increasingly active during times of cellular stress such as in response to intracellular DNA damage when removal of the host cell is paramount to prevent cancer. Unfortunately, once formed, cancer cells become impervious to apoptosis, creating a desperate need to identify an approach to induce apoptosis in these cells. An attractive option is to focus efforts on developing and locating compounds which activate apoptosis using natural compounds. Curcumin is a natural component in turmeric and is well-known for its pharmacological effects in preventing and combating many ailments and has been shown to decrease the rapid proliferation of a wide variety of tumor cells. However, to date, the apoptotic intermediates and interactions through which curcumin exerts its cytotoxic effects are unknown. Motivated by reports linking the intracellular modulation of the concentrations of Bid and Bcl-xL, following curcumin administration to cancer cells, we set out to probe for potential intermolecular interactions of these proteins with curcumin. Using several biophysical techniques, most notably, fluorescence, circular dichroism and nuclear magnetic resonance spectroscopy, we reveal binding interactions of curcumin with both Bcl-xLΔC and full-length Bid (Bid-FL) and prove that this binding is hydrophobically driven and localized to well-known functional regions of each protein. Specifically, our NMR studies show that while Bid-FL interacts with curcumin through its hydrophobic and pore forming helices (α6-α7), Bcl-xLΔC interacts with curcumin via its BH3 binding pocket (α2-α3-α4-α5), a critical region for mediating apoptosis.
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Affiliation(s)
- Suraj Singh
- Department of Biophysics, University of Mumbai, Santacruz (E), Mumbai, India
| | - C Ashley Barnes
- NIDDK, National Institute of Health, Bethesda, Maryland, USA
| | - Jacinta S D'Souza
- UM-DAE Centre for Excellence in Basic Sciences, Mumbai University Campus, Santacruz (E), Mumbai, India
| | - Ramakrishna V Hosur
- UM-DAE Centre for Excellence in Basic Sciences, Mumbai University Campus, Santacruz (E), Mumbai, India
| | - Pushpa Mishra
- Department of Biophysics, University of Mumbai, Santacruz (E), Mumbai, India
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Rose M, Kurylowicz M, Mahmood M, Winkel S, Moran-Mirabal JM, Fradin C. Direct Measurement of the Affinity between t Bid and Bax in a Mitochondria-Like Membrane. Int J Mol Sci 2021; 22:8240. [PMID: 34361006 PMCID: PMC8348223 DOI: 10.3390/ijms22158240] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/19/2021] [Accepted: 07/22/2021] [Indexed: 01/05/2023] Open
Abstract
The execution step in apoptosis is the permeabilization of the outer mitochondrial membrane, controlled by Bcl-2 family proteins. The physical interactions between the different proteins in this family and their relative abundance literally determine the fate of the cells. These interactions, however, are difficult to quantify, as they occur in a lipid membrane and involve proteins with multiple conformations and stoichiometries which can exist both in soluble and membrane. Here we focus on the interaction between two core Bcl-2 family members, the executor pore-forming protein Bax and the truncated form of the activator protein Bid (tBid), which we imaged at the single particle level in a mitochondria-like planar supported lipid bilayer. We inferred the conformation of the proteins from their mobility, and detected their transient interactions using a novel single particle cross-correlation analysis. We show that both tBid and Bax have at least two different conformations at the membrane, and that their affinity for one another increases by one order of magnitude (with a 2D-KD decreasing from ≃1.6μm-2 to ≃0.1μm-2) when they pass from their loosely membrane-associated to their transmembrane form. We conclude by proposing an updated molecular model for the activation of Bax by tBid.
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Affiliation(s)
- Markus Rose
- Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada; (M.R.); (M.K.); (M.M.); (S.W.)
| | - Martin Kurylowicz
- Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada; (M.R.); (M.K.); (M.M.); (S.W.)
| | - Mohammad Mahmood
- Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada; (M.R.); (M.K.); (M.M.); (S.W.)
| | - Sheldon Winkel
- Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada; (M.R.); (M.K.); (M.M.); (S.W.)
| | - Jose M. Moran-Mirabal
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada;
| | - Cécile Fradin
- Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada; (M.R.); (M.K.); (M.M.); (S.W.)
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4K1, Canada
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10
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Li Y, Liu Y, Zhou Y, Liu W, Fan Y, Jiang N, Xue M, Meng Y, Zeng L. Bid is involved in apoptosis induced by Chinese giant salamander iridovirus and contributes to the viral replication in an amphibian cell line. Dev Comp Immunol 2021; 116:103935. [PMID: 33242566 DOI: 10.1016/j.dci.2020.103935] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 11/16/2020] [Accepted: 11/16/2020] [Indexed: 06/11/2023]
Abstract
Bid is a pro-apoptotic BH3-only member of the Bcl-2 superfamily that functions to link the extrinsic apoptotic pathway and the mitochondrial amplification loop of the intrinsic pathway. In this study, the expression and functions of Chinese giant salamander (Andrias davidianus) Bid (AdBid) were investigated. The AdBid cDNA sequence contains an open reading frame (ORF) of 576 nucleotides, encoding a putative protein of 191 aa. AdBid possesses the conserved BH3 interacting domain and shared 34-52% sequence identities with other amphibian Bid. mRNA expression of AdBid was most abundant in muscle. The expression level of AdBid in Chinese giant salamander muscle, kidney and spleen significantly increased after Chinese giant salamander iridovirus (GSIV) infection. Additionally, a plasmid expressing AdBid was constructed and transfected into the Chinese giant salamander muscle cell line (GSM cells). The morphology and cytopathic effect (CPE) and apoptotic process in AdBid over-expressed GSM cells was significantly enhanced during GSIV infection compared with that in control cells. Moreover, a higher level of the virus major capsid protein (MCP) gene copies and protein synthesis was confirmed in the AdBid over-expressed cells. These results indicated that AdBid played a positive role in GSIV induced apoptosis and the viral replication. This study may contribute to the better understanding on the infection mechanism of iridovirus-induced apoptosis.
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Affiliation(s)
- Yiqun Li
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Yanan Liu
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Yong Zhou
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Wenzhi Liu
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Yuding Fan
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Nan Jiang
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Mingyang Xue
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Yan Meng
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Lingbing Zeng
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China.
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11
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Manara A, Imanifard Z, Fracasso L, Bellin D, Crimi M. Plants expressing murine pro-apoptotic protein Bid do not have enhanced PCD. BMC Res Notes 2020; 13:450. [PMID: 32957987 PMCID: PMC7507633 DOI: 10.1186/s13104-020-05285-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 09/11/2020] [Indexed: 12/22/2022] Open
Abstract
Objectives The purpose of this study was to explore whether plant programmed cell death (PCD) cascade can sense the presence of the animal-only BH3 protein Bid, a BCL-2 family protein known to play a regulatory role in the signaling cascade of animal apoptosis. Results We have expressed the mouse pro-apoptotic protein Bid in Arabidopsis thaliana and in Nicotiana tabacum. We did not obtain any transformed plant constitutively expressing the truncated protein (tBid—i.e. the caspase-activated form) whereas ectopic expression of the full-length protein (flBid) does not interfere with growth and development of the transformed plants. To verify whether the presence of this animal pro-apoptotic protein modified stress responses and PCD execution, both N. tabacum and A. thaliana plants constitutively expressing flBid have been studied under different stress conditions triggering cell death activation. The results show that the presence of flBid in transgenic plants did not significantly change the responses to abiotic stress (H2O2 or NO) and biotic stress treatments. Moreover, the finding that no Bid active form was present in treated tobacco plants suggests an absence of a proper activation of Bid.
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Affiliation(s)
- Anna Manara
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy.
| | - Zahra Imanifard
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy
| | - Linda Fracasso
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy
| | - Diana Bellin
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy
| | - Massimo Crimi
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy.
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12
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Abstract
Bax and Bak, two functionally similar, pro-apoptotic proteins of the Bcl-2 family, are known as the gateway to apoptosis because of their requisite roles as effectors of mitochondrial outer membrane permeabilization (MOMP), a major step during mitochondria-dependent apoptosis. The mechanism of how cells turn Bax/Bak from inert molecules into fully active and lethal effectors had long been the focal point of a major debate centered around two competing, but not mutually exclusive, models: direct activation and indirect activation. After intensive research efforts for over two decades, it is now widely accepted that to initiate apoptosis, some of the BH3-only proteins, a subclass of the Bcl-2 family, directly engage Bax/Bak to trigger their conformational transformation and activation. However, a series of recent discoveries, using previously unavailable CRISPR-engineered cell systems, challenge the basic premise that undergirds the consensus and provide evidence for a novel and surprisingly simple model of Bax/Bak activation: the membrane (lipids)-mediated spontaneous model. This review will discuss the evidence, rationale, significance, and implications of this new model.
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Affiliation(s)
- Xu Luo
- Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center, University of Alaska Medical Center, Omaha, ME, 68198-7696, USA.,Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, 68198-6805, USA
| | - Katelyn L O'Neill
- Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center, University of Alaska Medical Center, Omaha, ME, 68198-7696, USA
| | - Kai Huang
- Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center, University of Alaska Medical Center, Omaha, ME, 68198-7696, USA.,Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, 68198-6805, USA
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13
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Bogner C, Kale J, Pogmore J, Chi X, Shamas-Din A, Fradin C, Leber B, Andrews DW. Allosteric Regulation of BH3 Proteins in Bcl-x L Complexes Enables Switch-like Activation of Bax. Mol Cell 2020; 77:901-912.e9. [PMID: 32001105 DOI: 10.1016/j.molcel.2019.12.025] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 09/17/2019] [Accepted: 12/20/2019] [Indexed: 01/01/2023]
Abstract
Current models of apoptosis regulation by the Bcl-2 family of proteins postulate that heterodimeric interactions between family members determine whether Bax and Bak are activated to trigger cell death. Thus, the relative abundance and binding affinities between pro- and anti-apoptotic proteins determines the outcome of these interactions. Examination of these interactions using purified mitochondria and liposomes with full-length recombinant proteins revealed that Bcl-xL inhibits apoptosis as a higher-order complex that binds multiple BH3 proteins. Allosteric regulation of this complex by the BH3 sensitizer Bad confers switch-like activity to the indirect activation of Bax. The BH3 activator cBid sequestered by Bcl-xL complexes changes from an inactive to an active form while bound to a Bcl-xL complex only when Bad is also bound. Bcl-xL complexes enable Bad to function as a non-competitive inhibitor of Bcl-xL and allosterically activate cBid, dramatically enhancing the pro-apoptotic potency of Bad.
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Affiliation(s)
- Christian Bogner
- Sunnybrook Research Institute, University of Toronto, Toronto, ON M5S 1A1, Canada; Third Department of Medicine, Klinikum Rechts der Isar, Technische Universität München, München 80333, Germany
| | - Justin Kale
- Sunnybrook Research Institute, University of Toronto, Toronto, ON M5S 1A1, Canada
| | - Justin Pogmore
- Sunnybrook Research Institute, University of Toronto, Toronto, ON M5S 1A1, Canada
| | - Xiaoke Chi
- Sunnybrook Research Institute, University of Toronto, Toronto, ON M5S 1A1, Canada
| | - Aisha Shamas-Din
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada
| | - Cécile Fradin
- Departments of Biomedical Sciences and Biochemistry, McMaster University, Hamilton, ON L8S 4L8, Canada; Departments of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - Brian Leber
- Departments of Biomedical Sciences and Biochemistry, McMaster University, Hamilton, ON L8S 4L8, Canada; Department of Medicine, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - David W Andrews
- Sunnybrook Research Institute, University of Toronto, Toronto, ON M5S 1A1, Canada; Department of Medical Biophysics, University of Toronto, Toronto, ON M5S 1A1, Canada; Departments of Biomedical Sciences and Biochemistry, McMaster University, Hamilton, ON L8S 4L8, Canada.
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14
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Božič J, Bidovec K, Vizovišek M, Dolenc I, Stoka V. Menadione-induced apoptosis in U937 cells involves Bid cleavage and stefin B degradation. J Cell Biochem 2019; 120:10662-10669. [PMID: 30652348 DOI: 10.1002/jcb.28356] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 11/29/2018] [Indexed: 02/06/2023]
Abstract
Earlier studies showed that the oxidant menadione (MD) induces apoptosis in certain cells and also has anticancer effects. Most of these studies emphasized the role of the mitochondria in this process. However, the engagement of other organelles is less known. Particularly, the role of lysosomes and their proteolytic system, which participates in apoptotic cell death, is still unclear. The aim of this study was to investigate the role of lysosomal cathepsins on molecular signaling in MD-induced apoptosis in U937 cells. MD treatment induced translocation of cysteine cathepsins B, C, and S, and aspartic cathepsin D. Once in the cytosol, some cathepsins cleaved the proapoptotic molecule, Bid, in a process that was completely prevented by E64d, a general inhibitor of cysteine cathepsins, and partially prevented by the pancaspase inhibitor, z-VAD-fmk. Upon loss of the mitochondrial membrane potential, apoptosome activation led to caspase-9 processing, activation of caspase-3-like caspases, and poly (ADP-ribose) polymerase cleavage. Notably, the endogenous protein inhibitor, stefin B, was degraded by cathepsin D and caspases. This process was prevented by z-VAD-fmk, and partially by pepstatin A-penetratin. These findings suggest that the cleaved Bid protein acts as an amplifier of apoptotic signaling through mitochondria, thus enhancing the activity of cysteine cathepsins following stefin B degradation.
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Affiliation(s)
- Janja Božič
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia.,Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Katja Bidovec
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia.,Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Matej Vizovišek
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia
| | - Iztok Dolenc
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia
| | - Veronika Stoka
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia.,Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
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15
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Zhang W, Liu MW, Li M, Xiao W, Zhang XW, He HJ, Chen YB, Ding L, Luo KJ. Unexpected link between insect innexins and apoptosis of HeLa cells. Arch Insect Biochem Physiol 2018; 99:e21473. [PMID: 29862562 DOI: 10.1002/arch.21473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Little is known about how mammalian cells respond to the expression of innexins (Inxs), which are known to mediate cell-to-cell communication that causes apoptosis in the cells of the insect Spodoptera litura. The mammalian expression system, p3xFLAG tag protein, containing the CMV promoter, allowed us to construct two C-terminally elongated innexins (Cte-Inxs), SpliInx2 (Inx2-FLAG), and SpliInx3 (Inx3-FLAG), which were predicted to have the same secondary topological structures as the native SpliInx2 and SpliInx3. Here, we found that only the mRNAs of the two Cte-Inxs were expressed under the control of the CMV promoter in HeLa cells. Unexpectedly, mRNA expression of the two Cte-Inxs enhanced apoptosis of HeLa cells. The two Cte-Inx mRNAs were associated with a significant decrease in Akt phosphorylation in HeLa cells undergoing apoptosis. Furthermore, Inx3-FLAG mRNA expression in nonapoptotic HCT116 cells was also associated with a significant decrease in the levels of phosphorylated Akt. Intriguingly, expression of the mRNAs of the two Cte-Inxs did not activate caspase 3, but it markedly reduced Bid levels in HeLa cells undergoing apoptosis. These results suggest that mRNA expression of the two Cte-Inxs may activate a Bid-dependent apoptotic pathway in HeLa cells. Our study demonstrates that invertebrate gap junction mRNAs can function in vertebrate cancer cells as tumor suppressors.
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Affiliation(s)
- Wei Zhang
- School of Life Sciences, Yunnan University, Kunming, P.R. China
- Key Laboratory for Biochemistry and Molecular Biology of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
- Key Laboratory for Animal Genetic Diversity and Evolution of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
| | - Meng-Wei Liu
- School of Life Sciences, Yunnan University, Kunming, P.R. China
- Key Laboratory for Biochemistry and Molecular Biology of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
| | - Ming Li
- School of Life Sciences, Yunnan University, Kunming, P.R. China
- Key Laboratory for Biochemistry and Molecular Biology of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
- Key Laboratory for Animal Genetic Diversity and Evolution of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
| | - Wei Xiao
- School of Life Sciences, Yunnan University, Kunming, P.R. China
| | - Xue-Wen Zhang
- School of Life Sciences, Yunnan University, Kunming, P.R. China
- Key Laboratory for Biochemistry and Molecular Biology of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
- Key Laboratory for Animal Genetic Diversity and Evolution of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
| | - Hao-Juan He
- School of Life Sciences, Yunnan University, Kunming, P.R. China
- Key Laboratory for Biochemistry and Molecular Biology of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
- Key Laboratory for Animal Genetic Diversity and Evolution of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
| | - Ya-Bin Chen
- School of Life Sciences, Yunnan University, Kunming, P.R. China
- Key Laboratory for Biochemistry and Molecular Biology of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
| | - Lei Ding
- School of Life Sciences, Yunnan University, Kunming, P.R. China
- Key Laboratory for Biochemistry and Molecular Biology of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
| | - Kai-Jun Luo
- School of Life Sciences, Yunnan University, Kunming, P.R. China
- Key Laboratory for Biochemistry and Molecular Biology of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
- Key Laboratory for Animal Genetic Diversity and Evolution of High Education in Yunnan Province, Yunnan University, Kunming, P.R. China
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16
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Baay-Guzman GJ, Duran-Padilla MA, Rangel-Santiago J, Tirado-Rodriguez B, Antonio-Andres G, Barrios-Payan J, Mata-Espinosa D, Klunder-Klunder M, Vega MI, Hernandez-Pando R, Huerta-Yepez S. Dual role of hypoxia-inducible factor 1 α in experimental pulmonary tuberculosis: its implication as a new therapeutic target. Future Microbiol 2018; 13:785-798. [PMID: 29848058 DOI: 10.2217/fmb-2017-0168] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
AIM Investigate the role of hypoxia-inducible factor-1α (HIF-1α) in pulmonary tuberculosis (TB). METHODS & RESULTS A model of progressive pulmonary TB in BALB/c mice, immunohistochemistry and digital pathology were used. High HIF-1α expression was observed during early TB in activated macrophages. During late TB, even higher HIF-1α expression was observed in foamy macrophages, which are resistant to apoptosis. Blocking HIF-1α during early infection with 2-methoxyestradiol worsened the disease, while during late TB, it induced macrophage apoptosis and decreased bacillary loads. CONCLUSION HIF-1α has a dual role in experimental TB. This finding could have therapeutic implications because combined treatment with 2-methoxyestradiol and antibiotics appeared to eliminate mycobacteria more efficiently than conventional chemotherapy during advanced disease.
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Affiliation(s)
- Guillermina J Baay-Guzman
- Unidad de Investigacion en Enfermedades Oncologicas, Hospital Infantil de Mexico, Federico Gomez, Mexico City, Mexico
| | - Marco A Duran-Padilla
- Servicio de Patologia del Hospital General de Mexico, Facultad de Medicina de la UNAM, Mexico City, Mexico
| | - Jesus Rangel-Santiago
- Unidad de Investigacion en Enfermedades Oncologicas, Hospital Infantil de Mexico, Federico Gomez, Mexico City, Mexico
| | - Belen Tirado-Rodriguez
- Unidad de Investigacion en Enfermedades Oncologicas, Hospital Infantil de Mexico, Federico Gomez, Mexico City, Mexico
| | - Gabriela Antonio-Andres
- Unidad de Investigacion en Enfermedades Oncologicas, Hospital Infantil de Mexico, Federico Gomez, Mexico City, Mexico
| | - Jorge Barrios-Payan
- Section of Experimental Pathology, National Institute of Medical Sciences & Nutrition 'Salvador Zubirán', Mexico City, Mexico
| | - Dulce Mata-Espinosa
- Section of Experimental Pathology, National Institute of Medical Sciences & Nutrition 'Salvador Zubirán', Mexico City, Mexico
| | - Miguel Klunder-Klunder
- Departamento de Investigación en Salud Comunitaria, Hospital Infantil de Mexico, Federico Gomez, Mexico City, Mexico
| | - Mario I Vega
- Oncology Research Unit, Oncology Hospital, CMN SXXI, IMSS, Mexico City, Mexico.,Department of Medicine, Hematology-Oncology Division, VA West Los Angeles Medical Center BBRI, UCLA Medical Center, Jonsson Comprehensive Cancer Center, Los Angeles, California, USA
| | - Rogelio Hernandez-Pando
- Section of Experimental Pathology, National Institute of Medical Sciences & Nutrition 'Salvador Zubirán', Mexico City, Mexico
| | - Sara Huerta-Yepez
- Unidad de Investigacion en Enfermedades Oncologicas, Hospital Infantil de Mexico, Federico Gomez, Mexico City, Mexico
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17
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Kinsella S, Fichtner M, Watters O, König HG, Prehn JHM. Increased A20-E3 ubiquitin ligase interactions in bid-deficient glia attenuate TLR3- and TLR4-induced inflammation. J Neuroinflammation 2018; 15:130. [PMID: 29720226 DOI: 10.1186/s12974-018-1143-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 04/02/2018] [Indexed: 01/26/2023] Open
Abstract
Background Chronic pro-inflammatory signaling propagates damage to neural tissue and affects the rate of disease progression. Increased activation of Toll-like receptors (TLRs), master regulators of the innate immune response, is implicated in the etiology of several neuropathologies including amyotrophic lateral sclerosis, Alzheimer’s disease, and Parkinson’s disease. Previously, we identified that the Bcl-2 family protein BH3-interacting domain death agonist (Bid) potentiates the TLR4-NF-κB pro-inflammatory response in glia, and specifically characterized an interaction between Bid and TNF receptor associated factor 6 (TRAF6) in microglia in response to TLR4 activation. Methods We assessed the activation of mitogen-activated protein kinase (MAPK) and interferon regulatory factor 3 (IRF3) inflammatory pathways in response to TLR3 and TLR4 agonists in wild-type (wt) and bid-deficient microglia and macrophages, using Western blot and qPCR, focusing on the response of the E3 ubiquitin ligases Pellino 1 (Peli1) and TRAF3 in the absence of microglial and astrocytic Bid. Additionally, by Western blot, we investigated the Bid-dependent turnover of Peli1 and TRAF3 in wt and bid−/− microglia using the proteasome inhibitor Bortezomib. Interactions between the de-ubiquitinating Smad6-A20 and the E3 ubiquitin ligases, TRAF3 and TRAF6, were determined by FLAG pull-down in TRAF6-FLAG or Smad6-FLAG overexpressing wt and bid-deficient mixed glia. Results We elucidated a positive role of Bid in both TIR-domain-containing adapter-inducing interferon-β (TRIF)- and myeloid differentiation primary response 88 (MyD88)-dependent pathways downstream of TLR4, concurrently implicating TLR3-induced inflammation. We identified that Peli1 mRNA levels were significantly reduced in PolyI:C- and lipopolysaccharide (LPS)-stimulated bid-deficient microglia, suggesting disturbed IRF3 activation. Differential regulation of TRAF3 and Peli1, both essential E3 ubiquitin ligases facilitating TRIF-dependent signaling, was observed between wt and bid−/− microglia and astrocytes. bid deficiency resulted in increased A20-E3 ubiquitin ligase protein interactions in glia, specifically A20-TRAF6 and A20-TRAF3, implicating enhanced de-ubiquitination as the mechanism of action by which E3 ligase activity is perturbed. Furthermore, Smad6-facilitated recruitment of the de-ubiquitinase A20 to E3-ligases occurred in a bid-dependent manner. Conclusions This study demonstrates that Bid promotes E3 ubiquitin ligase-mediated signaling downstream of TLR3 and TLR4 and provides further evidence for the potential of Bid inhibition as a therapeutic for the attenuation of the robust pro-inflammatory response culminating in TLR activation. Electronic supplementary material The online version of this article (10.1186/s12974-018-1143-3) contains supplementary material, which is available to authorized users.
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18
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Zhu X, Zhang J, Wang Q, Fu H, Chang Y, Kong Y, Lv M, Xu L, Liu K, Huang X, Zhang X. Diminished expression of β2-GPI is associated with a reduced ability to mitigate complement activation in anti-GPIIb/IIIa-mediated immune thrombocytopenia. Ann Hematol 2017; 97:641-654. [PMID: 29350259 DOI: 10.1007/s00277-017-3215-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 12/20/2017] [Indexed: 12/26/2022]
Abstract
Anti-GPIIb/IIIa-mediated complement activation has been reported to be important in the pathogenesis of immune thrombocytopenia (ITP). However, the role of the complement system and the involved regulatory mechanism remain equivocal. Beta2-glycoprotein I (β2-GPI), known as the main target for antiphospholipid autoantibodies, has been demonstrated as a complement regulator. Here, we investigated the complement-regulatory role of β2-GPI in anti-GPIIb/IIIa-mediated ITP. Plasma complement activation and enhanced complement activation capacity (CAC) were found in ITP patients with anti-GPIIb/IIIa antibodies in vivo and in vitro. Diminished plasma levels of β2-GPI were shown in patients of this group, which was inversely correlated with C5b-9 deposition. C5b-9 generation was inhibited by approximate physiological concentrations of β2-GPI, in a dose-dependent manner. Inhibition of C3a generation by β2-GPI and the existence of β2-GPI/C3 complexes in plasma indicated a regulation on the level of the C3 convertase. Furthermore, β2-GPI down-regulated the phosphorylation levels of c-Jun N-terminal kinase (JNK) and cleavage of BH3 interacting domain death agonist (Bid) and ultimately harbored platelet lysis. Our findings may provide a novel link between diminished plasma levels of β2-GPI and enhanced complement activation, indicating β2-GPI as a potential diagnostic biomarker and therapeutic target in the treatment of anti-GPIIb/IIIa-mediated ITP.
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Affiliation(s)
- Xiaolu Zhu
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
- Collaborative Innovation Center of Hematology, Peking University, Beijing, 100044, China
| | - Jiamin Zhang
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
- Collaborative Innovation Center of Hematology, Peking University, Beijing, 100044, China
| | - Qianming Wang
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
| | - Haixia Fu
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
| | - Yingjun Chang
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
- Collaborative Innovation Center of Hematology, Peking University, Beijing, 100044, China
| | - Yuan Kong
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
- Collaborative Innovation Center of Hematology, Peking University, Beijing, 100044, China
| | - Meng Lv
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
| | - Lanping Xu
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
- Collaborative Innovation Center of Hematology, Peking University, Beijing, 100044, China
| | - Kaiyan Liu
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
- Collaborative Innovation Center of Hematology, Peking University, Beijing, 100044, China
| | - Xiaojun Huang
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China
- Collaborative Innovation Center of Hematology, Peking University, Beijing, 100044, China
| | - Xiaohui Zhang
- Peking University People's Hospital, Peking University Institute of Hematology, Beijing, 100044, China.
- Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, 100044, China.
- Collaborative Innovation Center of Hematology, Peking University, Beijing, 100044, China.
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19
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Hu WL, Dong HY, Li Y, Ojcius DM, Li SJ, Yan J. Bid-Induced Release of AIF/EndoG from Mitochondria Causes Apoptosis of Macrophages during Infection with Leptospira interrogans. Front Cell Infect Microbiol 2017; 7:471. [PMID: 29184851 PMCID: PMC5694448 DOI: 10.3389/fcimb.2017.00471] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 10/27/2017] [Indexed: 12/20/2022] Open
Abstract
Leptospirosis is a global zoonotic infectious disease caused by pathogenic Leptospira species. Leptospire-induced macrophage apoptosis through the Fas/FasL-caspase-8/3 pathway plays an important role in the survival and proliferation of the pathogen in hosts. Although, the release of mitochondrial apoptosis-inducing factor (AIF) and endonuclease G (EndoG) in leptospire-infected macrophages has been described, the mechanisms linking caspase and mitochondrion-related host-cell apoptosis has not been determined. Here, we demonstrated that leptospire-infection induced apoptosis through mitochondrial damages in macrophages. Apoptosis was caused by the mitochondrial release and nuclear translocation of AIF and/or EndoG, leading to nuclear DNA fragmentation. However, the mitochondrion-related CytC-caspase-9/3 pathway was not activated. Next, we found that the release and translocation of AIF and/or EndoG was preceded by the activation of the BH3-interacting domain death agonist (Bid). Furthermore, our data demonstrated that caspase-8 was activated during the infection and caused the activation of Bid. Meanwhile, high reactive oxygen species (ROS) trigged by the infection caused the dephosphorylation of Akt, which also activated Bid. In conclusion, Bid-mediated mitochondrial release of AIF and/or EndoG followed by nuclear translocation is a major mechanism of leptospire- induced apoptosis in macrophages, and this process is modulated by both caspase-8 and ROS-Akt signal pathways.
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Affiliation(s)
- Wei-Lin Hu
- Department of Medical Microbiology and Parasitology, Zhejiang University School of Medicine, Hangzhou, China.,Division of Basic Medical Microbiology, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Hai-Yan Dong
- Department of Medical Microbiology and Immunology, Wenzhou Medical University, Wenzhou, China
| | - Yang Li
- Department of Medical Microbiology and Parasitology, Zhejiang University School of Medicine, Hangzhou, China.,Division of Basic Medical Microbiology, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - David M Ojcius
- Department of Biomedical Sciences, University of the Pacific, Arthur Dugoni School of Dentistry, San Francisco, CA, United States
| | - Shi-Jun Li
- Institute of Communicable Disease Control and Prevention, Guizhou Provincial Centre for Disease Control and Prevention, Guiyang, China
| | - Jie Yan
- Department of Medical Microbiology and Parasitology, Zhejiang University School of Medicine, Hangzhou, China.,Division of Basic Medical Microbiology, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
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Kim WS, Lee KS, Kim JH, Kim CK, Lee G, Choe J, Won MH, Kim TH, Jeoung D, Lee H, Kim JY, Ae Jeong M, Ha KS, Kwon YG, Kim YM. The caspase-8/ Bid/cytochrome c axis links signals from death receptors to mitochondrial reactive oxygen species production. Free Radic Biol Med 2017; 112:567-577. [PMID: 28888620 DOI: 10.1016/j.freeradbiomed.2017.09.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Revised: 08/30/2017] [Accepted: 09/01/2017] [Indexed: 01/09/2023]
Abstract
Ligation of the death receptors for TNF-α, FasL, and TRAIL triggers two common pathways, caspase-dependent intrinsic apoptosis and intracellular reactive oxygen species (ROS) generation. The apoptotic pathway is well characterized; however, a signaling linker between the death receptor and ROS production has not been clearly elucidated. Here, we found that death receptor-induced ROS generation was strongly inhibited by mitochondrial complex I and II inhibitors, but not by inhibitors of NADPH oxidase, lipoxygenase, cyclooxygenase or xanthine oxidase, indicating that ROS are mostly generated by the impairment of the mitochondrial respiratory chain. ROS generation was accompanied by caspase-8 activation, Bid cleavage, and cytochrome c release; it was blocked in FADD- and caspase-8-deficient cells, as well as by caspase-8 knockdown and inhibitor. Moreover, Bid knockdown abrogated TNF-α- or TRAIL-induced ROS generation, whereas overexpression of truncated Bid (tBid) or knockdown of cytochrome c spontaneously elevated ROS production. In addition, p53-overexpressing cells accumulated intracellular ROS via cytochrome c release mediated by the BH3-only protein Noxa induction. In a cell-free reconstitution system, caspase-8-mediated Bid cleavage and recombinant tBid induced mitochondrial cytochrome c release and ROS generation, which were blocked by Bcl-xL and antioxidant enzymes. These data suggest that anti-apoptotic Bcl-2 proteins play an important role in mitochondrial ROS generation by preventing cytochrome c release. These data provide evidence that the FADD/caspase-8/Bid/cytochrome c axis is a crucial linker between death receptors and mitochondria, where they play a role in ROS generation and apoptosis.
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Affiliation(s)
- Wan-Sung Kim
- Departments of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Kwang-Soon Lee
- Departments of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Ji-Hee Kim
- Departments of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Chun-Ki Kim
- Departments of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Gwangsoo Lee
- Departments of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Jongseon Choe
- Departments of Immunology, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Moo-Ho Won
- Departments of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Tae-Hyoung Kim
- Department of Biochemistry, Chosun University School of Medicine, Dong-Gu, Gwangju 501-759, South Korea
| | - Dooil Jeoung
- Departments of Biochemistry, College of Natural Sciences, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Hansoo Lee
- Life Sciences, College of Natural Sciences, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Ji-Yoon Kim
- Department of Anesthesiology and Pain Medicine, Hanyang University Hospital, Seoul, South Korea
| | - Mi Ae Jeong
- Department of Anesthesiology and Pain Medicine, Hanyang University Hospital, Seoul, South Korea
| | - Kwon-Soo Ha
- Departments of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, South Korea
| | - Young-Guen Kwon
- Department of Biochemistry, College of Science and Biotechnology, Yonsei University, Seoul 120-749, South Korea
| | - Young-Myeong Kim
- Departments of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, South Korea.
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He L, Wang H, Luo L, Li Y, Huang R, Liao L, Zhu Z, Wang Y. Bid-deficient fish delay grass carp reovirus (GCRV) replication and attenuate GCRV-triggered apoptosis. Oncotarget 2017; 8:76408-76422. [PMID: 29100321 PMCID: PMC5652715 DOI: 10.18632/oncotarget.19460] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 06/27/2017] [Indexed: 01/05/2023] Open
Abstract
Bid, BH3-interacting domain death agonist, is a pro-apoptotic BH3-only member of Bcl-2 family, playing an important role in apoptosis. In the study, Bid genes from grass carp (Ctenopharyngodon idellus) and rare minnow (Gobiocypris rarus), named CiBid and GrBid, were cloned and analyzed. Bid was constitutively expressed in all examined tissues of grass carp, but the expression level varied in different tissues. Following grass carp reovirus (GCRV) stimulation in vivo, Bid and apoptosis related genes Caspase-9 and Caspase-3 was up-regulated significantly at the late stage of infection. Moreover, we generated a Bid-deficient rare minnow (Bid-/-) to investigate the possible role of Bid in GCRV-triggered apoptosis. We found that the survival time of Bid-/- rare minnow after GCRV infection was extended when compared with wild-type fish, the relative copy number of GCRV in Bid-/- rare minnow was lower than that in wild-type fish, and the expression level of Caspase-9 and Caspase-3 in Bid-/- rare minnow were significantly lower than that in the wild-type fish. Collectively, the current data revealed the important role of Bid during virus-induced apoptosis in teleost fish. Our study would provide new insight into understanding the GCRV induced apoptosis and may provide a target gene for virus-resistant breeding in grass carp.
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Affiliation(s)
- Libo He
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Hao Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.,University of Chinese Academy of Sciences, Beijing 100049, China.,Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Lifei Luo
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yongming Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Rong Huang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Lanjie Liao
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Zuoyan Zhu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Yaping Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
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Predescu SA, Zhang J, Bardita C, Patel M, Godbole V, Predescu DN. Mouse Lung Fibroblast Resistance to Fas-Mediated Apoptosis Is Dependent on the Baculoviral Inhibitor of Apoptosis Protein 4 and the Cellular FLICE-Inhibitory Protein. Front Physiol 2017; 8:128. [PMID: 28352235 PMCID: PMC5348516 DOI: 10.3389/fphys.2017.00128] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 02/17/2017] [Indexed: 01/01/2023] Open
Abstract
A characteristic feature of idiopathic pulmonary fibrosis (IPF) is accumulation of apoptotic resistant fibroblasts/myofibroblasts in the fibroblastic foci. As caveolin (Cav)-null mice develop pulmonary fibrosis (PF), we hypothesized that the participating fibroblasts display an apoptosis-resistant phenotype. To test this hypothesis and identify the molecular mechanisms involved we isolated lung fibroblasts from Cav-null mice and examined the expression of several inhibitors of apoptosis (IAPs), of c-FLIP, of Bcl-2 proteins and of the death receptor CD95/Fas. We found significant increase in XIAP and c-FLIP constitutive protein expression with no alteration of Bcl-2 and lower levels of CD95/Fas. The isolated fibroblasts were then treated with the CD95/Fas ligand (FasL) to induce apoptosis. While the morphological and biochemical alterations induced by FasL were similar in wild-type (wt) and Cav-null mouse lung fibroblasts, the time course and the extent of the alterations were greater in the Cav-null fibroblasts. Several salient features of Cav-null fibroblasts response such as loss of membrane potential, fragmentation of the mitochondrial continuum concurrent with caspase-8 activation, and subsequent Bid cleavage, prior to caspase-3 activation were detected. Furthermore, M30 antigen formation, phosphatidylserine expression and DNA fragmentation were caspase-3 dependent. SiRNA-mediated silencing of XIAP and c-FLIP, individually or combined, enhanced the sensitivity of lung fibroblasts to FasL-induced apoptosis. Pharmacological inhibition of Bcl-2 had no effect. Together our findings support a mechanism in which CD95/Fas engagement activates caspase-8, inducing mitochondrial apoptosis through Bid cleavage. XIAP and c-FLIP fine tune this process in a cell-type specific manner.
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Affiliation(s)
- Sanda A Predescu
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
| | - Jian Zhang
- Department of Biological Sciences, Columbia University New York, NY, USA
| | - Cristina Bardita
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
| | - Monal Patel
- Northwestern University Feinberg School of Medicine Chicago, IL, USA
| | - Varun Godbole
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
| | - Dan N Predescu
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
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Yang N, Chen Q, He X, Zhao X, Wei T. ESeroS-GS Protects Neuronal Cells from Oxidative Stress by Stabilizing Lysosomes. Molecules 2016; 21:E637. [PMID: 27231890 DOI: 10.3390/molecules21060637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 05/09/2016] [Accepted: 05/10/2016] [Indexed: 11/16/2022] Open
Abstract
γ-l-glutamyl-S-[2-[[[3,4-dihydro-2,5,7,8-tetramethyl-2-(4,8,12-trimethyltridecyl)-2H-1-benzopyran-6-yl]oxy]carbonyl]-3-[[2-(1H-indol-3-yl)ethyl]amino]-3-oxopropyl]-l-cysteinylglycine sodium salt (ESeroS-GS) is a water-soluble derivative of α-tocopherol (vitamin E). We reported previously that ESeroS-GS can act as an anti-inflammatory agent and can induce cell death in breast cancer cells. However, the potential antioxidant capacities of ESeroS-GS remain elusive. Here, we measured its scavenging effects on free radicals and evaluated its protective effects on neuronal cells against oxidative stress. The results indicated that ESeroS-GS effectively scavenged both 2,2’-azinobis(3-ethylbenzothiazoline)-6-sulfonate free radicals (ABTS•+) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radicals, and attenuated H2O2-induced neuronal cell death. H2O2 treatment induced lysosomal membrane permeabilization rapidly, and caused the redistribution of lysosomal proteases, which were responsible for the neuronal cell death. ESeroS-GS abolished the interaction between tBid and the lysosomal membranes, blocked the translocation of tBid to the lysosomal membranes, decreased its oligomerization within the membrane circumstances, prevented the lysosomal membrane permeabilization, and thus attenuated the neuronal cell death. These data suggest that ESeroS-GS protected the neuronal cells from oxidative stress by stabilizing lysosomal membranes, and thus might act as a novel neuroprotector for neuronal diseases associated with oxidative stress.
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Naghdi S, Hajnóczky G. VDAC2-specific cellular functions and the underlying structure. Biochim Biophys Acta 2016; 1863:2503-14. [PMID: 27116927 DOI: 10.1016/j.bbamcr.2016.04.020] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 04/20/2016] [Accepted: 04/20/2016] [Indexed: 01/30/2023]
Abstract
Voltage Dependent Anion-selective Channel 2 (VDAC2) contributes to oxidative metabolism by sharing a role in solute transport across the outer mitochondrial membrane (OMM) with other isoforms of the VDAC family, VDAC1 and VDAC3. Recent studies revealed that VDAC2 also has a distinctive role in mediating sarcoplasmic reticulum to mitochondria local Ca(2+) transport at least in cardiomyocytes, which is unlikely to be explained simply by the expression level of VDAC2. Furthermore, a strictly isoform-dependent VDAC2 function was revealed in the mitochondrial import and OMM-permeabilizing function of pro-apoptotic Bcl-2 family proteins, primarily Bak in many cell types. In addition, emerging evidence indicates a variety of other isoform-specific engagements for VDAC2. Since VDAC isoforms display 75% sequence similarity, the distinctive structure underlying VDAC2-specific functions is an intriguing problem. In this paper we summarize studies of VDAC2 structure and functions, which suggest a fundamental and exclusive role for VDAC2 in health and disease. This article is part of a Special Issue entitled: Mitochondrial Channels edited by Pierre Sonveaux, Pierre Maechler and Jean-Claude Martinou.
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25
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Eguchi A, De Mollerat Du Jeu X, Johnson CD, Nektaria A, Feldstein AE. Liver Bid suppression for treatment of fibrosis associated with non-alcoholic steatohepatitis. J Hepatol 2016; 64:699-707. [PMID: 26555271 PMCID: PMC4761314 DOI: 10.1016/j.jhep.2015.11.002] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 10/27/2015] [Accepted: 11/02/2015] [Indexed: 12/15/2022]
Abstract
BACKGROUND & AIMS Liver fibrosis is the most worrisome feature of non-alcoholic steatohepatitis (NASH). Growing evidence supports a link between hepatocyte apoptosis and liver fibrogenesis. Our aim was to determine the therapeutic efficacy and safety of liver Bid, a key pro-apoptotic molecule, suppression using RNA interference (RNAi) for the treatment of fibrosis. METHODS First, we optimized the delivery system for Bid siRNA in mice using ten different stealth RNAi siRNAs and two lipid formulations -Invivofectamine2.0 and a newly developed Invivofectamine3.0 - that have been designed for high efficacy accumulation in the liver, assessed via real-time PCR of Bid mRNA. Next, C57BL/6 mice were placed on a choline-deficient L-amino acid defined (CDAA) diet. After 19weeks of the CDAA diet, a time point that results in severe fibrotic NASH, mice were injected with the selected Bid siRNA-Invivofectamine3.0 biweekly for three weeks. Additionally hepatocyte-specific Bid deficient (Bid(Δhep)) mice were placed on CDAA diet for 20weeks. RESULTS A maximum Bid knockdown was achieved at 1.5mg/kg siRNA with Invivofectamine3.0, whereas it was at 7mg/kg with Invivofectamine2.0. In NASH mice, after 3weeks of treatment, BID protein was reduced to 10% and this was associated with an improvement in liver fibrosis and inflammation associated with a marked reduction in TUNEL positive cells, caspase 3 activation, and a reduction in mitochondrial BAX and BAK. Bid(Δhep) mice showed similar protection from fibrotic changes. CONCLUSION Our data demonstrate that liver Bid suppression by RNAi technology, as well as hepatocyte-specific Bid deficiency, improves liver fibrosis coupled with a reduction of inflammation in experimental NASH. These findings are consistent with existing evidence that hepatocyte apoptosis triggers hepatic stellate cell activation and liver fibrosis and suggest that Bid inhibition may be useful as an antifibrotic NASH therapy.
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Affiliation(s)
- Akiko Eguchi
- Department of Pediatrics, University of California - San Diego, 9500 Gilman Drive, La Jolla, USA
| | | | - Casey D Johnson
- Department of Pediatrics, University of California - San Diego, 9500 Gilman Drive, La Jolla, USA
| | | | - Ariel E Feldstein
- Department of Pediatrics, University of California - San Diego, 9500 Gilman Drive, La Jolla, USA.
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26
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Zhang F, Chen L, Jin H, Shao J, Wu L, Lu Y, Zheng S. Activation of Fas death receptor pathway and Bid in hepatocytes is involved in saikosaponin D induction of hepatotoxicity. Environ Toxicol Pharmacol 2016; 41:8-13. [PMID: 26645133 DOI: 10.1016/j.etap.2015.11.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 11/01/2015] [Accepted: 11/02/2015] [Indexed: 06/05/2023]
Abstract
Drug-induced liver injury can lead to acute liver failure. Saikosaponin D (SSD) is a major component isolated from the medicinal herb Bupleurum falcatum, which has been linked to hepatotoxicity. We previously reported that SSD disrupted PDGF-βR pathway leading to mitochondrial apoptosis in human LO2 hepatocytes. The present study was aimed at further exploring the underlying mechanisms in vitro and in vivo. We initially determined the concentration range of SSD at up to 2μM for subsequent apoptosis examinations. SSD significantly upregulated Fas expression, promoted caspase-8 cleavage and activated the pro-apoptotic protein Bid in LO2 cells. Moreover, SSD reduced the abundance of cytochrome c in mitochondria and increased the cleaved-caspase-3 in LO2 cells, but did not apparently affect PI3K/AKT, ERK and STAT3 pathways that are involved in cell fate regulation. Experiments in vivo showed that one-week treatment with SSD at 300 mg/kg significantly elevated the liver/body weight ratio and caused histological injury in mouse liver. Furthermore, SSD treatment induced massive hepatocyte apoptosis, and significantly downregulated Bcl-2 but upregulated Bax in mouse liver. Taken together, these results revealed a specific mechanism of activation of extrinsic apoptosis pathway and Bid by SSD, which was involved in SSD-induced mitochondrial apoptosis in hepatocytes and potential hepatotoxicity.
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Affiliation(s)
- Feng Zhang
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Li Chen
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Huanhuan Jin
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Jiangjuan Shao
- Department of Pharmacy, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Li Wu
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Yin Lu
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Shizhong Zheng
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, China.
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27
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Yue J, Ben Messaoud N, López JM. Hyperosmotic Shock Engages Two Positive Feedback Loops through Caspase-3-dependent Proteolysis of JNK1-2 and Bid. J Biol Chem 2015; 290:30375-89. [PMID: 26511318 DOI: 10.1074/jbc.m115.660506] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Indexed: 01/07/2023] Open
Abstract
Hyperosmotic shock induces early calpain activation, Smac/DIABLO release from the mitochondria, and p38/JNK activation in Xenopus oocytes. These pathways regulate late cytochrome c release and caspase-3 activation. Here, we show that JNK1-1 and JNK1-2 are activated early by osmostress, and sustained activation of both isoforms accelerates the apoptotic program. When caspase-3 is activated, JNK1-2 is proteolyzed at Asp-385 increasing the release of cytochrome c and caspase-3 activity, thereby creating a positive feedback loop. Expression of Bcl-xL markedly reduces hyperosmotic shock-induced apoptosis. In contrast, expression of Bid induces rapid caspase-3 activation, even in the absence of osmostress, which is blocked by Bcl-xL co-expression. In these conditions a significant amount of Bid in the cytosol is mono- and bi-ubiquitinated. Caspase-3 activation by hyperosmotic shock induces proteolysis of Bid and mono-ubiquitinated Bid at Asp-52 increasing the release of cytochrome c and caspase-3 activation, and thus creating a second positive feedback loop. Revealing the JNK isoforms and the loops activated by osmostress could help to design better treatments for human diseases caused by perturbations in fluid osmolarity.
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Affiliation(s)
- Jicheng Yue
- From the Institut de Neurociències, Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica, Facultad de Medicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
| | - Nabil Ben Messaoud
- From the Institut de Neurociències, Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica, Facultad de Medicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
| | - José M López
- From the Institut de Neurociències, Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica, Facultad de Medicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
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Wood SJ, Goldufsky JW, Bello D, Masood S, Shafikhani SH. Pseudomonas aeruginosa ExoT Induces Mitochondrial Apoptosis in Target Host Cells in a Manner That Depends on Its GTPase-activating Protein (GAP) Domain Activity. J Biol Chem 2015; 290:29063-73. [PMID: 26451042 DOI: 10.1074/jbc.m115.689950] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Indexed: 12/17/2022] Open
Abstract
Pseudomonas aeruginosa is the most common cause of hospital-acquired pneumonia and a killer of immunocompromised patients. We and others have demonstrated that the type III secretion system (T3SS) effector protein ExoT plays a pivotal role in facilitating P. aeruginosa pathogenesis. ExoT possesses an N-terminal GTPase-activating protein (GAP) domain and a C-terminal ADP-ribosyltransferase (ADPRT) domain. Because it targets multiple non-overlapping cellular targets, ExoT performs several distinct virulence functions for P. aeruginosa, including induction of apoptosis in a variety of target host cells. Both the ADPRT and the GAP domain activities contribute to ExoT-induced apoptosis. The ADPRT domain of ExoT induces atypical anoikis by transforming an innocuous cellular protein, Crk, into a cytotoxin, which interferes with integrin survival signaling. However, the mechanism underlying the GAP-induced apoptosis remains unknown. In this study, we demonstrate that the GAP domain activity is both necessary and sufficient to induce mitochondrial (intrinsic) apoptosis. We show that intoxication with GAP domain results in: (i) JNK1/2 activation; (ii) substantial increases in the mitochondrial levels of activated pro-apoptotic proteins Bax and Bid, and to a lesser extent Bim; (iii) loss of mitochondrial membrane potential and cytochrome c release; and (iv) activation of initiator caspase-9 and executioner caspase-3. Further, GAP-induced apoptosis is partially mediated by JNK1/2, but it is completely dependent on caspase-9 activity. Together, the ADPRT and the GAP domains make ExoT into a highly versatile and potent cytotoxin, capable of inducing multiple forms of apoptosis in target host cells.
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Affiliation(s)
| | | | | | - Sara Masood
- From the Department of Immunology/Microbiology
| | - Sasha H Shafikhani
- From the Department of Immunology/Microbiology, Department of Internal Medicine, and Cancer Center, Rush University Medical Center, Chicago, Illinois 60612
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29
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Abstract
The Bcl-2 family proteins control apoptosis by regulation of outer mitochondrial membrane permeabilization. Studying the Bcl-2 family is particularly difficult because the functional interactions that regulate apoptosis occur at or within intracellular membranes. Compared to other biophysical methods, fluorescence spectroscopy is well suited to study membrane-bound proteins as experiments can be performed with intact membranes and at protein concentrations similar to those found in cells. For these reasons, fluorescence spectroscopy has been particularly useful in studying the regulation of membrane permeabilization by Bcl-2 family proteins. Here, we discuss four fluorescence-based assays used to study protein dynamics at membranes, with a focus on how these techniques can be used to study the Bcl-2 family proteins.
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Affiliation(s)
- Justin Kale
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada; Department of Biological Sciences, Sunnybrook Research Institute, Toronto, Canada
| | - Xiaoke Chi
- Department of Biological Sciences, Sunnybrook Research Institute, Toronto, Canada; Department of Chemical Biology, McMaster University, Hamilton, Canada
| | - Brian Leber
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada; Department of Medicine, McMaster University, Hamilton, Canada
| | - David Andrews
- Department of Biological Sciences, Sunnybrook Research Institute, Toronto, Canada.
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30
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Zaman F, Chrysis D, Huntjens K, Chagin A, Takigawa M, Fadeel B, Sävendahl L. Dexamethasone differentially regulates Bcl-2 family proteins in human proliferative chondrocytes: role of pro-apoptotic Bid. Toxicol Lett 2013; 224:196-200. [PMID: 24172751 DOI: 10.1016/j.toxlet.2013.10.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 08/10/2013] [Accepted: 10/19/2013] [Indexed: 12/27/2022]
Abstract
Glucocorticoids (GCs) are widely used to treat inflammatory diseases and cancers. A multitude of undesired side effects have been reported in GC-treated patients including decreased linear bone growth. We have previously reported that GCs activate the caspase cascade and trigger Bax-mediated mitochondrial apoptosis in growth plate chondrocytes causing growth retardation in young mice. To further explore the role of mitochondrial apoptosis in GC-induced bone growth retardation, a number of pro- and anti-apoptotic proteins were studied in ex vivo cultures of human growth plate cartilage and human HCS-2/8 proliferative chondrocytes exposed to dexamethasone. Dexamethasone was found to increase the pro-apoptotic proteins Bcl-xS, Bad, and Bak as well as the proteolysis of Bid. Anti-Bid small interfering RNA partially rescued the chondrocytes from dexamethasone-induced apoptosis. Taken together, our data suggest that GC treatment differentially regulates Bcl-2 family member proteins to facilitate mitochondrial apoptosis in proliferative chondrocytes thereby contributing to GC-induced bone growth impairment. Prevention of this imbalance between pro- and anti-apoptotic Bcl-2 family proteins may provide a new strategy to protect from adverse effects of GCs on bone growth.
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Affiliation(s)
- Farasat Zaman
- Department of Women's and Children's Health, Pediatric Endocrinology Unit, Astrid Lindgren Children's Hospital, Karolinska Institutet, Stockholm 171 76, Sweden.
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Shamas-Din A, Bindner S, Zhu W, Zaltsman Y, Campbell C, Gross A, Leber B, Andrews DW, Fradin C. t Bid undergoes multiple conformational changes at the membrane required for Bax activation. J Biol Chem 2013; 288:22111-27. [PMID: 23744079 DOI: 10.1074/jbc.m113.482109] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Bid is a Bcl-2 family protein that promotes apoptosis by activating Bax and eliciting mitochondrial outer membrane permeabilization (MOMP). Full-length Bid is cleaved in response to apoptotic stimuli into two fragments, p7 and tBid (p15), that are held together by strong hydrophobic interactions until the complex binds to membranes. The detailed mechanism(s) of fragment separation including tBid binding to membranes and release of the p7 fragment to the cytoplasm remain unclear. Using liposomes or isolated mitochondria with fluorescently labeled proteins at physiological concentrations as in vitro models, we report that the two components of the complex quickly separate upon interaction with a membrane. Once tBid binds to the membrane, it undergoes slow structural rearrangements that result in an equilibrium between two major tBid conformations on the membrane. The conformational change of tBid is a prerequisite for interaction with Bax and is, therefore, a novel step that can be modulated to promote or inhibit MOMP. Using automated high-throughput image analysis in cells, we show that down-regulation of Mtch2 causes a significant delay between tBid and Bax relocalization in cells. We propose that by promoting insertion of tBid via a conformational change at the mitochondrial outer membrane, Mtch2 accelerates tBid-mediated Bax activation and MOMP. Thus the interaction of Mtch2 and tBid is a potential target for therapeutic control of Bid initiated cell death.
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Affiliation(s)
- Aisha Shamas-Din
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario L8N 3Z5, Canada
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Bhat V, Olenick MB, Schuchardt BJ, Mikles DC, Deegan BJ, McDonald CB, Seldeen KL, Kurouski D, Faridi MH, Shareef MM, Gupta V, Lednev IK, Farooq A. Heat-induced fibrillation of BclXL apoptotic repressor. Biophys Chem 2013; 179:12-25. [PMID: 23714425 DOI: 10.1016/j.bpc.2013.04.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/24/2013] [Accepted: 04/30/2013] [Indexed: 12/18/2022]
Abstract
The BclXL apoptotic repressor bears the propensity to associate into megadalton oligomers in solution, particularly under acidic pH. Herein, using various biophysical methods, we analyze the effect of temperature on the oligomerization of BclXL. Our data show that BclXL undergoes irreversible aggregation and assembles into highly-ordered rope-like homogeneous fibrils with length in the order of mm and a diameter in the μm-range under elevated temperatures. Remarkably, the formation of such fibrils correlates with the decay of a largely α-helical fold into a predominantly β-sheet architecture of BclXL in a manner akin to the formation of amyloid fibrils. Further interrogation reveals that while BclXL fibrils formed under elevated temperatures show no observable affinity toward BH3 ligands, they appear to be optimally primed for insertion into cardiolipin bicelles. This salient observation strongly argues that BclXL fibrils likely represent an on-pathway intermediate for insertion into mitochondrial outer membrane during the onset of apoptosis. Collectively, our study sheds light on the propensity of BclXL to form amyloid-like fibrils with important consequences on its mechanism of action in gauging the apoptotic fate of cells in health and disease.
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Affiliation(s)
- Vikas Bhat
- Department of Biochemistry & Molecular Biology, Leonard Miller School of Medicine, University of Miami, Miami, FL 33136, USA
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Lien LM, Su CC, Hsu WH, Lu WJ, Chung CL, Yen TL, Chiu HC, Sheu JR, Lin KH. Mechanisms of andrographolide-induced platelet apoptosis in human platelets: regulatory roles of the extrinsic apoptotic pathway. Phytother Res 2013; 27:1671-7. [PMID: 23292890 DOI: 10.1002/ptr.4911] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 11/23/2012] [Accepted: 11/23/2012] [Indexed: 11/07/2022]
Abstract
Andrographolide, a novel nuclear factor-κB (NF-κB) inhibitor, is isolated from the leaves of Andrographis paniculata. Platelet activation is relevant to a variety of coronary heart diseases. Our recent studies revealed that andrographolide possesses potent antiplatelet activity by inhibition of the p38 MAPK/(●) HO-NF-κB-ERK2 cascade. Although platelets are anucleated cells, apoptotic machinery apparatus recently has been found to regulate platelet activation and limit platelet lifespan. Therefore, we further investigated the regulatory effects of andrographolide on platelet apoptotic events. In this study, apoptotic signaling events for caspase-3, -8, and Bid were time (10-60 min)- and dose (25-100 μΜ)-dependently activated by andrographolide in human platelets. Andrographolide could also disrupt mitrochondrial membrane potential. In addition, caspase-8 inhibitor (z-IETD-fmk, 50 μΜ) was found to reverse andrographolide-induced caspase-8 activation, whereas the antagonistic anti-Fas receptor (ZB4, 500 ng/mL) and anti-tumor necrosis factor-R1 (H398, 10 µg/mL) monoclonal antibodies did not. In conclusion, this study for the first time demonstrated that andrographolide might limit platelet lifespan by initiating the caspase-8-dependent extrinsic apoptotic pathway, in spite of no direct evidence that death receptors are involved in this process proved. Overall, the various medicinal properties of andrographolide suggest its potential value in treating patients with thromboembolic disorders.
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Affiliation(s)
- Li-Ming Lien
- Central Laboratory, Shin-Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan; Department of Neurology, Shin-Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
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Guo WJ, Wang AY, Gao C. Apoptosis and expression of apoptosis-related proteins Bid and Bcl-xL in human small intestinal adenocarcinoma. Shijie Huaren Xiaohua Zazhi 2010; 18:1127-1133. [DOI: 10.11569/wcjd.v18.i11.1127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To examine whether apoptosis and expression of apoptosis-related proteins Bid and Bcl-xL are involved in the pathogenesis of small intestinal adenocarcinoma.
METHODS: Forty-two tissue samples, including 7 from human small intestinal adenocarcinoma (of the jejunum and ileum) and 35 from normal small intestine (the jejunum), were examined in our study. Apoptotic index (AI) was assessed by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay. The expression of Bid and Bcl-xL proteins was detected by immunohistochemistry (IHC).
RESULTS: A significantly higher level of enterocyte apoptosis was observed in normal small intestine tissue compared with small intestinal adenocarcinoma (mean AI, 15.78% vs 0.29%, t = 6.51, P < 0.01). The positive rate of Bid expression in normal small intestine tissue (moderate/strong immunoreactivity in the cytoplasm of villus epithelial cells) was significantly higher (77.14% vs 28.57%, P < 0.05) than that in small intestinal adenocarcinoma, while the positive rate of Bcl-xL expression was significantly lower (34.29% vs 86.71%, P < 0.05) in normal small intestine tissue than in adenocarcinoma. The percentage of samples having a Bid/Bcl-xL ratio ≥ 1 was significantly lower in small intestinal adenocarcinoma compared to normal small intestinal tissue (14.29% vs 80.00%, P < 0.01). A positive correlation was noted between AI and Bid expression level (r = 0.368, P < 0.05), but not between AI and Bcl-xL expression level (r = 0.017, P > 0.05).
CONCLUSION: Decreased apoptosis, Bid expression and Bid/Bcl-xL ratio may play a role in the carcinogenesis of human small intestine adenocarcinoma.
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Nan YM, Hu YL, Fu N, Wu WJ. Novel effect of the expression of proapoptotic proteins Bad, Bax and Bid in non-alcoholic steatohepatitis. Shijie Huaren Xiaohua Zazhi 2008; 16:81-85. [DOI: 10.11569/wcjd.v16.i1.81] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To explore the effects of expression of apoptosis-related proteins Bad, Bax and Bid on the progress of non-alcoholic steatohepatitis (NASH) in mice.
METHODS: Experimental NASH models were established by feeding mice with a high fat, methionine and choline deficient (MCD) diet (MCD group). Control animals were fed with a choline-methionine supplemented diet (control group). Hepatic steatosis, inflammation and fibrosis were graded by routine H&E staining of liver sections. The levels of proapoptotic-related proteins, such as Bad, Bax and Bid, were determined by Western blot.
RESULTS: Mice fed with the MCD diet exhibited mild steatosis on day 10, moderate steatohepatitis in week 3 and severe steatohepatitis in week 8, as detected by H&E staining, in parallel with a rise in the levels of transaminases. Hepatic expression of Bad and Bax proteins was more pronounced from day 10, and continued to rise until week 3 and 8 in the MCD group compared with the control group (P < 0.05, P < 0.01 and P < 0.05, respectively). Moreover, Bid was activated through hydrolyzation and up-regulated by day 10, week 3 and 8 (P < 0.01).
CONCLUSION: Combined expression of the proapoptotic proteins Bad, Bax and Bid may be involved in the progression of MCD-induced steatohepatitis.
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Cabrales-Romero MDP, Márquez-Rosado L, Fattel-Fazenda S, Trejo-Solís C, Arce-Popoca E, Alemán-Lazarini L, Villa-Treviño S. S-adenosyl-methionine decreases ethanol-induced apoptosis in primary hepatocyte cultures by a c-Jun N-terminal kinase activity-independent mechanism. World J Gastroenterol 2006; 12:1895-904. [PMID: 16609996 PMCID: PMC4087515 DOI: 10.3748/wjg.v12.i12.1895] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To determine the role of c-Jun N-terminal kinase (JNK) activity in ethanol-induced apoptosis and the modulation of this signaling cascade by S-Adenosyl-methionine (AdoMet).
METHODS: Primary hepatocyte cultures were pretreated with 100 µmol/L SP600125, a selective JNK inhibitor, 1 mL/L DMSO or 4 mmol/L AdoMet and then exposed to 100 mmo/L ethanol. Hepatocyte apoptosis was determined by the TUNEL and DNA ladder assays. JNK activity and its inhibition by SP600125 and AdoMet were determined by Western blot analysis of c-jun phosphorylation and Bid fragmentation. SP600125 and AdoMet effects on the apoptotic signaling pathway were determined by Western blot analysis of cytochrome c release and pro-caspase 3 fragmentation. The AdoMet effect on glutathione levels was measured by Ellman’s method and reactive oxygen species (ROS) generation by cell cytometry.
RESULTS: The exposure of hepatocytes to ethanol induced JNK activation, c-jun phosphorylation, Bid fragmentation, cytochrome c release and pro-caspase 3 cleavage; these effects were diminished by SP600125, and caused a significant decrease in ethanol-induced apoptosis (P< 0.05). AdoMet exerted an antioxidant effect maintaining glutathione levels and decreasing ROS generation, without a significant effect on JNK activity, and prevented cytochrome c release and pro-caspase 3 cleavage.
CONCLUSION: The JNK signaling cascade is a key component of the proapoptotic signaling pathway induced by ethanol. JNK activation may be independent from ROS generation, since AdoMet which exerted antioxidant properties did not have a significant effect on JNK activity. JNK pathway modulator agents and AdoMet may be components of promising therapies for alcoholic liver disease (ALD) treatment.
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