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Wang Y, Su W, Mai Z, Yu S, Wang X, Chen T. Anti-apoptotic capacity of Mcl-1Δ127. Biochem Biophys Res Commun 2020; 526:1042-1048. [PMID: 32331834 DOI: 10.1016/j.bbrc.2020.03.181] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Accepted: 03/30/2020] [Indexed: 11/29/2022]
Abstract
The anti-apoptotic ability of Mcl-1Δ127, a caspase cleavage product of Mcl-1, is debated. We here used fluorescence imaging to assess the anti-apoptotic capacity of Mcl-1Δ127 in living cells. Fluorescence imaging of living cells expressing CFP-Mcl-1Δ127 showed that Mcl-1Δ127 existed mainly in cytoplasm. Fluorescence imaging of living cells co-expressing CFP-Mcl-1Δ127 and YFP-Bak, CFP-Mcl-1Δ127 and YFP-BimL, CFP-Mcl-1Δ127 and YFP-Puma or CFP-Mcl-1Δ127 and YFP-tBid showed that Mcl-1Δ127 markedly inhibited the oligomerization of Bak, BimL, Puma and tBid on mitochondria and also inhibited the Bak-, BimL-, Puma- or tBid-mediated cell death, resulting in their partial localization in cytoplasm. Fluorescence resonance energy transfer (FRET) imaging proved that Mcl-1Δ127 bound to Bak, BimL, Puma and tBid, respectively. Fluorescence loss in photobleaching (FLIP) analyses showed that Mcl-1Δ127 did prevent Bak oligomerization by retrotranslocating Bak from mitochondria into cytoplasm. Collectively, Mcl-1Δ127 has the same anti-apoptotic capacity as Mcl-1, and prevents apoptosis by sequestering BH3-only or Bak proteins, thus inhibiting their oligomerization on mitochondria.
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Affiliation(s)
- Yong Wang
- MOE Key Laboratory & Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China
| | - Wenhua Su
- MOE Key Laboratory & Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China
| | - Zihao Mai
- MOE Key Laboratory & Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China
| | - Si Yu
- MOE Key Laboratory & Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China
| | - Xiaoping Wang
- Department of Pain Management, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, China.
| | - Tongsheng Chen
- MOE Key Laboratory & Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China.
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A dominant-negative F-box deleted mutant of E3 ubiquitin ligase, β-TrCP1/FWD1, markedly reduces myeloma cell growth and survival in mice. Oncotarget 2016; 6:21589-602. [PMID: 26009993 PMCID: PMC4673288 DOI: 10.18632/oncotarget.4120] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 04/30/2015] [Indexed: 11/25/2022] Open
Abstract
Treatment of multiple myeloma with bortezomib can result in severe adverse effects, necessitating the development of targeted inhibitors of the proteasome. We show that stable expression of a dominant-negative F-box deleted (ΔF) mutant of the E3 ubiquitin ligase, SCFβ-TrCP/FWD1, in murine 5TGM1 myeloma cells dramatically attenuated their skeletal engraftment and survival when inoculated into immunocompetent C57BL/KaLwRij mice. Similar results were obtained in immunodeficient bg-nu-xid mice, suggesting that the observed effects were independent of host recipient immune status. Bone marrow stroma offered no protection for 5TGM1-ΔF cells in cocultures treated with tumor necrosis factor (TNF), indicating a cell-autonomous anti-myeloma effect. Levels of p100, IκBα, Mcl-1, ATF4, total and cleaved caspase-3, and phospho-β-catenin were elevated in 5TGM1-ΔF cells whereas cIAP was down-regulated. TNF also activated caspase-3 and downregulated Bcl-2, correlating with the enhanced susceptibility of 5TGM1-ΔF cells to apoptosis. Treatment of 5TGM1 tumor-bearing mice with a β-TrCP1/FWD1 inhibitor, pyrrolidine dithiocarbamate (PDTC), significantly reduced tumor burden in bone. PDTC also increased levels of cleaved Mcl-1 and caspase-3 in U266 human myeloma cells, correlating with our murine data and validating the development of specific β-TrCP inhibitors as an alternative therapy to nonspecific proteasome inhibitors for myeloma patients.
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Reynolds LM, Ding J, Taylor JR, Lohman K, Soranzo N, de la Fuente A, Liu TF, Johnson C, Barr RG, Register TC, Donohue KM, Talor MV, Cihakova D, Gu C, Divers J, Siscovick D, Burke G, Post W, Shea S, Jacobs DR, Hoeschele I, McCall CE, Kritchevsky SB, Herrington D, Tracy RP, Liu Y. Transcriptomic profiles of aging in purified human immune cells. BMC Genomics 2015; 16:333. [PMID: 25898983 PMCID: PMC4417516 DOI: 10.1186/s12864-015-1522-4] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 04/10/2015] [Indexed: 01/08/2023] Open
Abstract
Background Transcriptomic studies hold great potential towards understanding the human aging process. Previous transcriptomic studies have identified many genes with age-associated expression levels; however, small samples sizes and mixed cell types often make these results difficult to interpret. Results Using transcriptomic profiles in CD14+ monocytes from 1,264 participants of the Multi-Ethnic Study of Atherosclerosis (aged 55–94 years), we identified 2,704 genes differentially expressed with chronological age (false discovery rate, FDR ≤ 0.001). We further identified six networks of co-expressed genes that included prominent genes from three pathways: protein synthesis (particularly mitochondrial ribosomal genes), oxidative phosphorylation, and autophagy, with expression patterns suggesting these pathways decline with age. Expression of several chromatin remodeler and transcriptional modifier genes strongly correlated with expression of oxidative phosphorylation and ribosomal protein synthesis genes. 17% of genes with age-associated expression harbored CpG sites whose degree of methylation significantly mediated the relationship between age and gene expression (p < 0.05). Lastly, 15 genes with age-associated expression were also associated (FDR ≤ 0.01) with pulse pressure independent of chronological age. Comparing transcriptomic profiles of CD14+ monocytes to CD4+ T cells from a subset (n = 423) of the population, we identified 30 age-associated (FDR < 0.01) genes in common, while larger sets of differentially expressed genes were unique to either T cells (188 genes) or monocytes (383 genes). At the pathway level, a decline in ribosomal protein synthesis machinery gene expression with age was detectable in both cell types. Conclusions An overall decline in expression of ribosomal protein synthesis genes with age was detected in CD14+ monocytes and CD4+ T cells, demonstrating that some patterns of aging are likely shared between different cell types. Our findings also support cell-specific effects of age on gene expression, illustrating the importance of using purified cell samples for future transcriptomic studies. Longitudinal work is required to establish the relationship between identified age-associated genes/pathways and aging-related diseases. Electronic supplementary material The online version of this article (doi:10.1186/s12864-015-1522-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lindsay M Reynolds
- Department of Epidemiology and Prevention, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - Jingzhong Ding
- Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - Jackson R Taylor
- Department of Gerontology and Geriatric Medicine, J. Paul Sticht Center on Aging, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - Kurt Lohman
- Department of Biostatistical Sciences, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | | | - Alberto de la Fuente
- FBN, Leibniz Institute for Farm Animal Biology, Genetics and Biometry, Mecklenburg-Vorpommern, Germany.
| | - Tie Fu Liu
- Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - Craig Johnson
- Departments of Medicine and Epidemiology, Cardiovascular Health Research Unit, University of Washington, Seattle, Washington, 98115, USA.
| | - R Graham Barr
- Departments of Medicine and Epidemiology, Columbia University, New York, New York, 10032, USA.
| | - Thomas C Register
- Department of Pathology, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - Kathleen M Donohue
- Departments of Medicine and Epidemiology, Columbia University, New York, New York, 10032, USA.
| | - Monica V Talor
- Department of Pathology, Johns Hopkins University, Baltimore, Maryland, 21205, USA.
| | - Daniela Cihakova
- Department of Pathology, Johns Hopkins University, Baltimore, Maryland, 21205, USA.
| | - Charles Gu
- Division of Biostatistics, Washington University School of Medicine, St. Louis, Missouri, 63110, USA.
| | - Jasmin Divers
- Department of Biostatistical Sciences, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - David Siscovick
- New York Academy of Medicine, New York, New York, 10029, USA.
| | - Gregory Burke
- Department of Epidemiology and Prevention, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - Wendy Post
- Department of Pathology, Johns Hopkins University, Baltimore, Maryland, 21205, USA.
| | - Steven Shea
- Departments of Medicine and Epidemiology, Columbia University, New York, New York, 10032, USA.
| | - David R Jacobs
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota, 55454, USA.
| | - Ina Hoeschele
- Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, USA.
| | - Charles E McCall
- Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA. .,Department of Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - Stephen B Kritchevsky
- Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA. .,Department of Gerontology and Geriatric Medicine, J. Paul Sticht Center on Aging, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - David Herrington
- Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
| | - Russell P Tracy
- Department of Pathology, University of Vermont, Colchester, Vermont, 05446, USA.
| | - Yongmei Liu
- Department of Epidemiology and Prevention, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina, 27157, USA.
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