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Conradi N, Claude KM, Lee BE, Saleh A, Mandhane P, Hawkes M. Utility of solar-powered oxygen delivery in a resource-constrained setting. Pulmonology 2021:S2531-0437(21)00224-5. [PMID: 34937668 DOI: 10.1016/j.pulmoe.2021.11.005] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 11/10/2021] [Accepted: 11/20/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Pneumonia is a leading cause of childhood mortality globally. Children with severe pneumonia associated with hypoxaemia require oxygen (O2) therapy, which is scarce across resource-constrained countries. Solar-powered oxygen (SPO2) is a novel technology developed for delivering therapeutic O2 in resource-constrained environments. RESEARCH QUESTION Is the introduction of SPO2 associated with a reduction in mortality, relative to the existing practice? STUDY DESIGN This was a pragmatic, quasi-experimental study comparing mortality amongst children < 5 years of age with hypoxaemic respiratory illness before and after the installation of SPO2 in two resource-constrained hospitals. METHODS Participants were children < 5 years old admitted with acute hypoxaemic respiratory illness. The intervention was SPO2, installed at two resource-constrained hospitals. The primary outcome was 30-day mortality. Secondary outcomes included in-hospital mortality (time to death), length of hospital stay among survivors, duration of O2 therapy (time to wean O2), and O2 delivery system failure(s). RESULTS Mortality amongst children admitted with acute hypoxaemic respiratory illness decreased from 30/50 (60%) pre-SPO2 to 15/50 (30%) post-SPO2 (relative risk reduction 50%, 95%CI 19 - 69, p = 0.0049). The post-SPO2 period was consistently associated with decreased mortality in statistical models adjusting for potential confounding factors. Likewise, survival curves pre- and post- SPO2 differed significantly (hazard ratio 0.39, 95% CI 0.20 - 0.74, p = 0.0043). A reduction in the frequency of O2 delivery interruptions due to fuel shortages and multiple patients needing the concentrator at once was observed, explaining the mortality reduction. INTERPRETATION Solar-powered oxygen installation was associated with decreased mortality in resource-constrained settings.
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2
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Madhu V, Boneski PK, Silagi E, Qiu Y, Kurland I, Guntur AR, Shapiro IM, Risbud MV. Hypoxic Regulation of Mitochondrial Metabolism and Mitophagy in Nucleus Pulposus Cells Is Dependent on HIF-1α-BNIP3 Axis. J Bone Miner Res 2020; 35:1504-1524. [PMID: 32251541 PMCID: PMC7778522 DOI: 10.1002/jbmr.4019] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 02/28/2020] [Accepted: 03/15/2020] [Indexed: 12/31/2022]
Abstract
Nucleus pulposus (NP) cells reside in an avascular and hypoxic microenvironment of the intervertebral disc and are predominantly glycolytic due to robust HIF-1 activity. It is generally thought that NP cells contain few functional mitochondria compared with cells that rely on oxidative metabolism. Consequently, the contribution of mitochondria to NP cell metabolism and the role of hypoxia and HIF-1 in mitochondrial homeostasis is poorly understood. Using mitoQC reporter mice, we show for the first time to our knowledge that NP cell mitochondria undergo age-dependent mitophagy in vivo. Mechanistically, in vitro studies suggest that, under hypoxic conditions, mitochondria in primary NP cells undergo HIF-1α-dependent fragmentation, controlled by modulating the levels of key proteins DRP1 and OPA1 that are involved in mitochondrial fission and fusion, respectively. Seahorse assays and steady state metabolic profiling coupled with [1-2-13 C]-glucose flux analysis revealed that in hypoxia, HIF-1α regulated metabolic flux through coordinating glycolysis and the mitochondrial TCA cycle interactions, thereby controlling the overall biosynthetic capacity of NP cells. We further show that hypoxia and HIF-1α trigger mitophagy in NP cells through the mitochondrial translocation of BNIP3, an inducer of receptor-mediated mitophagy. Surprisingly, however, loss of HIF-1α in vitro and analysis of NP-specific HIF-1α null mice do not show a decrease in mitophagic flux in NP cells but a compensatory increase in NIX and PINK1-Parkin pathways with higher mitochondrial number. Taken together, our studies provide novel mechanistic insights into the complex interplay between hypoxia and HIF-1α signaling on the mitochondrial metabolism and quality control in NP cells. © 2020 American Society for Bone and Mineral Research.
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Affiliation(s)
- Vedavathi Madhu
- Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, PA, USA
| | - Paige K Boneski
- Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, PA, USA
| | - Elizabeth Silagi
- Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, PA, USA.,Cell Biology and Regenerative Medicine Graduate Program, Thomas Jefferson University, Philadelphia, PA, USA
| | - Yunping Qiu
- Department of Medicine, Fleischer Institute for Diabetes and Metabolism, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Irwin Kurland
- Department of Medicine, Fleischer Institute for Diabetes and Metabolism, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Anyonya R Guntur
- Center for Molecular Medicine, Maine Medical Center Research Institute, Scarborough, ME, USA
| | - Irving M Shapiro
- Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, PA, USA.,Cell Biology and Regenerative Medicine Graduate Program, Thomas Jefferson University, Philadelphia, PA, USA
| | - Makarand V Risbud
- Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, PA, USA.,Cell Biology and Regenerative Medicine Graduate Program, Thomas Jefferson University, Philadelphia, PA, USA
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3
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Chandravanshi B, Bhonde RR. Shielding Engineered Islets With Mesenchymal Stem Cells Enhance Survival Under Hypoxia. J Cell Biochem 2017; 118:2672-2683. [PMID: 28098405 DOI: 10.1002/jcb.25885] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 01/13/2017] [Indexed: 12/21/2022]
Abstract
In the present study we focused on the improvisation of islet survival in hypoxia.The Islet like cell aggregates (ICAs) derived from wharton's jelly mesenchymal stem cells (WJ MSC) were cultured with and without WJ MSC for 48 h in hypoxia and normoxia and tested for their direct trophic effect on β cell survival. The WJ MSCs themselves secreted insulin upon glucose challenge and expressed the pancreatic markers at both transcription and translational level (C-peptide, Insulin, Glucagon, and Glut 2). Direct contact of MSCs with ICAs facilitated highest viability under hypoxia as evidenced by fluorescein diacetate/propidium iodide and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The cytokine analysis of the co-cultured ICAs revealed amplification of anti-inflammatory cytokine like TGFβ and TNFα accompanied by depletion of pro-inflammatory cytokines. The increment in VEGF and PDGFa was also seen showing their ability to vascularize upon transplantation. This was further accompanied by reduction in total reactive oxygen species, nitric oxide, and super oxide ions and down regulation of Caspase3, Caspase8, p53, and up regulation of Bcl2 confirming prevention of apoptosis in ICAs. The western blot analysis confirmed the cytoprotective effect of WJ MSC on ICAs as they enhanced the anti-apoptotic marker BCL2 and reduced the expression of apoptotic markers, Annexin 5 and Caspase 3. There was a significant reduction in the expression of p38 protein in the presence of MSCs making the ICAs responsive to glucose. Taken together our data demonstrate for the first time that the WJ MSC expressed pancreatic markers and their supplementation protected engineered islets against hypoxia and oxidative stress. J. Cell. Biochem. 118: 2672-2683, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Bhawna Chandravanshi
- School of Regenerative Medicine, Manipal University, Bangalore, Karnataka, India
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4
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Pezzi A, Amorin B, Laureano Á, Valim V, Dahmer A, Zambonato B, Sehn F, Wilke I, Bruschi L, Silva MALD, Filippi-Chiela E, Silla L. Effects Of Hypoxia in Long-Term In Vitro Expansion of Human Bone Marrow Derived Mesenchymal Stem Cells. J Cell Biochem 2017; 118:3072-3079. [PMID: 28240374 DOI: 10.1002/jcb.25953] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [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: 02/22/2017] [Accepted: 02/23/2017] [Indexed: 12/21/2022]
Abstract
Mesenchymal stem cells (MSC) are considered multipotent stromal, non-hematopoietic cells with properties of self-renovation and differentiation. Optimal conditions for culture of MSC have been under investigation. The oxygen tension used for cultivation has been studied and appears to play an important role in biological behavior of mesenchymal cells. The aim is characterize MSC in hypoxia and normoxia conditions comparing their morphological and functional characteristics. Bone marrow-derived mesenchymal stem cells obtained from 15 healthy donors and cultured. MSC obtained from each donor were separated into two cultivation conditions normoxia (21% O2 ) and hypoxia (three donors at 1%, three donors at 2%, five donors at 3%, and four donors at 4% O2 ) up to second passage. MSC were evaluated for proliferation, differentiation, immunophenotyping, size and cell complexity, oxidative stress, mitochondrial activity, and autophagy. Culture conditions applied did not seem to affect immunophenotypic features and cellular plasticity. However, cells subjected to hypoxia showed smaller size and greater cellular complexity, besides lower proliferation (P < 0.002). Furthermore, cells cultured in low O2 tension had lower mitochondrial activity (P < 0.03) and a reduced tendency to autophagy, although oxidative stress did not vary among groups (P < 0.39). Oxygen tension seems to be a key regulator of cellular adaptation in vitro, and metabolic effects underlying this variable remain undescribed. Heterogeneity or even lack of results on the impact of oxygen concentration used for expanding MSC highlights the need for further research, in order to optimize conditions of cultivation and expansion and achieve greater safety and therapeutic efficacy. J. Cell. Biochem. 118: 3072-3079, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Annelise Pezzi
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil.,Post-graduation: Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Bruna Amorin
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil.,Centro Universitário Ritter dos Reis, Porto Alegre, Brazil
| | - Álvaro Laureano
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil.,Post-graduation: Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Vanessa Valim
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil.,Post-graduation: Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Alice Dahmer
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil.,Post-graduation: Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Bruna Zambonato
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil.,Post-graduation: Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Filipe Sehn
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil.,Post-graduation: Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Ianaê Wilke
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil.,Post-graduation: Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Maria Aparecida Lima da Silva
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil
| | | | - Lucia Silla
- Celular Therapy Center of Hospital de Clinicas de Porto Alegre, Center for Experimental Research, Porto Alegre, Brazil.,Post-graduation: Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,Hematology and Bone Marrow Transplantation of Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil
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5
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Ding X, Zhou S, Li M, Cao C, Wu P, Sun L, Fei G, Wang R. Upregulation of SRF Is Associated With Hypoxic Pulmonary Hypertension by Promoting Viability of Smooth Muscle Cells via Increasing Expression of Bcl-2. J Cell Biochem 2017; 118:2731-2738. [PMID: 28176371 DOI: 10.1002/jcb.25922] [Citation(s) in RCA: 14] [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: 09/17/2016] [Accepted: 02/06/2017] [Indexed: 12/11/2022]
Abstract
The aim of study was to investigate the involvement of hypoxia-induced upregulation of serum response factor (SRF) and its downstream effector, B cell leukemia-2 (Bcl-2), in hypoxia-induced pulmonary hypertension (PH). Immunohistochemistry analysis and western blot analysis were used to detect the levels of SRF and Bcl-2 in rats exposed to hypoxia. Furthermore, the regulatory relationship between SRF and Bcl-2 was investigated in PASMCs using real-time PCR and western-blot analysis. We found that mPAP (mean pulmonary arterial pressure) and WA (the ratio of vascular wall area to external diameter) were increased after exposure to hypoxia, while LA (the ratio of vascular lumen area to total area) decreased after exposure to hypoxia. The immunohistochemistry analysis displayed a substantial increase in SRF and Bcl-2 in pulmonary arterial walls after 14 days of hypoxia. And the western blotting showed that SRF and Bcl-2 protein levels were much higher after 7 days of hypoxia and then remained at a high level. And then the levels of SRF and Bcl-2 in pulmonary artery smooth muscle cells (PASMCs) exposed to hypoxia were substantially suppressed following introduction of SRF siRNA, and the level of Bcl-2 was remarkably inhibited by Bcl-2 siRNA, while Bcl-2 siRNA had no effect on SRF level. Finally, SRF siRNA, and Bcl-2 siRNA significantly reduced viability of PASMCs exposed to hypoxia, and enhanced apoptosis of PASMCs exposed to hypoxia. These data validated that SRF responded to hypoxia, which subsequently was involved in pulmonary hypertension by abnormally promoting viability of PASMCs via modulating expression of Bcl-2. J. Cell. Biochem. 118: 2731-2738, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Xing Ding
- Department of Respiratory Medicine, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Sijing Zhou
- Department of Occupational Medicine, Hefei Third Clinical College Affiliated to Anhui Medical University, Hefei, China
| | - Min Li
- Department of Oncology, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Chao Cao
- Department of Respiratory Medicine, Ningbo First Hospital, Ningbo, China
| | - Peipei Wu
- Department of Respiratory Medicine, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Li Sun
- Department of Respiratory Medicine, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Guanghe Fei
- Department of Respiratory Medicine, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Ran Wang
- Department of Respiratory Medicine, First Affiliated Hospital of Anhui Medical University, Hefei, China
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6
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Alivand MR, Soheili ZS, Pornour M, Solali S, Sabouni F. Novel Epigenetic Controlling of Hypoxia Pathway Related to Overexpression and Promoter Hypomethylation of TET1 and TET2 in RPE Cells. J Cell Biochem 2017; 118:3193-3204. [PMID: 28252217 DOI: 10.1002/jcb.25965] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 02/28/2017] [Indexed: 12/19/2022]
Abstract
CpG methylation of DNA takes part in a specific epigenetic memory that plays crucial roles in the differentiation and abnormality of the cells. The methylation pattern aberration of genomes is affected in three ways, namely DNA methyltransferase (DNMT), ten-eleven translocation (TET), and methyl-binding domain (MBD) proteins. Of these, TET enzymes have recently been demonstrated to be master modifier enzymes in the DNA methylation process. Additionally, recent studies emphasize that not only epigenetic phenomena play a role in controlling hypoxia pathway, but the hypoxia condition also triggers hypomethylation of genomes that may help with the expression of hypoxia pathway genes. In this study, we suggested that TET1 and TET2 could play a role in the demethylation of genomes under chemical hypoxia conditions. Herein, the evaluating methylation status and mRNA expression of mentioned genes were utilized through real-time PCR and methylation-specific PCR (MSP), respectively. Our results showed that TET1 and TET2 genes were overexpressed (P < 0.05) under chemical hypoxia conditions in Retinal Pigment Epithelial (RPE) cells, whereas the promoter methylation status of them were hypomethylated in the same condition. Therefore, chemical hypoxia not only causes overexpression of TET1 and TET2 but also could gradually do promoter demethylation of same genes. This is the first study to show the relationship between epigenetics and the expression of mentioned genes related to hypoxia pathways. Furthermore, it seems that these associations in RPE cells are subjected to chemical hypoxia as a mechanism that could play a crucial role in methylation pattern changes of hypoxia-related diseases such as cancer and ischemia. J. Cell. Biochem. 118: 3193-3204, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Mohammad Reza Alivand
- Department of Medical Genetics, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Zahra-Soheila Soheili
- Department of Molecular Medicine, Institute of Medical Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | | | - Saeed Solali
- Department of Hematology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Farzaneh Sabouni
- Department of Molecular Medicine, Institute of Medical Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
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7
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Shirai K, Hamada Y, Arakawa N, Yamazaki A, Tohgi N, Aki R, Mii S, Hoffman RM, Amoh Y. Hypoxia Enhances Differentiation of Hair Follicle-Associated-Pluripotent (HAP) Stem Cells to Cardiac-Muscle Cells. J Cell Biochem 2016; 118:554-558. [PMID: 27627796 DOI: 10.1002/jcb.25734] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [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: 08/05/2016] [Accepted: 09/12/2016] [Indexed: 01/19/2023]
Abstract
We have previously demonstrated that the neural stem-cell marker nestin is expressed in hair-follicle stem cells located in the bulge area which are termed hair-follicle-associated pluripotent (HAP) stem cells. HAP stem cells from mouse and human could form spheres in culture, termed hair spheres, which are keratin 15-negative and nestin-positive and could differentiate to neurons, glia, keratinocytes, smooth muscle cells, and melanocytes in vitro. Subsequently, we demonstrated that nestin-expressing stem cells could effect nerve and spinal cord regeneration in mouse models. Recently, we demonstrated that HAP stem cells differentiated to beating cardiac muscle cells. We recently observed that isoproterenol directs HAP stem cells to differentiate to cardiac-muscle cells in large numbers in culture compared to HAP stem cells not supplemented with isoproterenol. The addition of activin A, bone morphogenetic protein 4, and basic fibroblast growth factor, along with isoproternal, induced the cardiac muscle cells to form tissue sheets of beating heart muscle cells. In the present study, we report that, under hypoxic conditions, HAP stem cells differentiated to troponin-positive cardiac-muscle cells at a higher rate that under normoxic conditions. Hypoxia did not influence the differentiation to other cell types. For future use of HAP stem cells for cardiac muscle regeneration, hypoxia should enhance the rate of differentiation thereby providing patients more opportunities to use their own HAP stem cells which are easily accessible, for this purpose. J. Cell. Biochem. 118: 554-558, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Kyoumi Shirai
- Department of Dermatology, Kitasato University School of Medicine, Minami Ward, Sagamihara, Kanagawa, 252-0374, Japan.,Department of Dermatology, National Hospital Organization Yokohama Medical Center, Totsuka Ward, Yokohama, 245-8575, Japan
| | - Yuko Hamada
- Department of Dermatology, Kitasato University School of Medicine, Minami Ward, Sagamihara, Kanagawa, 252-0374, Japan
| | - Nobuko Arakawa
- Department of Dermatology, Kitasato University School of Medicine, Minami Ward, Sagamihara, Kanagawa, 252-0374, Japan
| | - Aiko Yamazaki
- Department of Dermatology, Kitasato University School of Medicine, Minami Ward, Sagamihara, Kanagawa, 252-0374, Japan
| | - Natsuko Tohgi
- Department of Dermatology, Kitasato University School of Medicine, Minami Ward, Sagamihara, Kanagawa, 252-0374, Japan
| | - Ryoichi Aki
- Department of Dermatology, Kitasato University School of Medicine, Minami Ward, Sagamihara, Kanagawa, 252-0374, Japan
| | - Sumiyuki Mii
- Department of Dermatology, Kitasato University School of Medicine, Minami Ward, Sagamihara, Kanagawa, 252-0374, Japan
| | - Robert M Hoffman
- AntiCancer, Inc., 7917 Ostrow Street, San Diego, California, 92111.,Department of Surgery, University of California, San Diego, California, 92103
| | - Yasuyuki Amoh
- Department of Dermatology, Kitasato University School of Medicine, Minami Ward, Sagamihara, Kanagawa, 252-0374, Japan
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8
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Schoepflin ZR, Shapiro IM, Risbud MV. Class I and IIa HDACs Mediate HIF-1α Stability Through PHD2-Dependent Mechanism, While HDAC6, a Class IIb Member, Promotes HIF-1α Transcriptional Activity in Nucleus Pulposus Cells of the Intervertebral Disc. J Bone Miner Res 2016; 31:1287-99. [PMID: 26765925 PMCID: PMC4891304 DOI: 10.1002/jbmr.2787] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 12/29/2015] [Accepted: 01/08/2016] [Indexed: 12/17/2022]
Abstract
The objective of this study was to determine the role of histone deacetylases (HDACs) in regulating HIF-1α protein stability and activity in nucleus pulposus (NP) cells. Treatment of NP cells with pan-HDAC inhibitor TSA resulted in decreased HIF-1α levels under both normoxia and hypoxia in a dose-dependent fashion. TSA-mediated HIF-1α degradation was rescued by concomitant inhibition of not only the 26S proteasome but also PHD2 function. Moreover, TSA treatment of PHD2(-/-) cells had little effect on HIF-1α levels, supporting the notion that inhibition of PHD2 function by HDACs contributed to HIF-1α stabilization. Surprisingly, class-specific HDAC inhibitors did not affect HIF-1α protein stability, indicating that multiple HDACs controlled HIF-1α stability by regulating HIF-1α-PHD2 interaction in NP cells. Interestingly, lower-dose TSA that did not affect HIF-1α stability decreased its activity and target gene expression. Likewise, rescue of TSA-mediated HIF-1α protein degradation by blocking proteasomal or PHD activity did not restore HIF-1 activity, suggesting that HDACs independently regulate HIF-1α stability and activity. Noteworthy, selective inhibition of HDAC6 and not of class I and IIa HDACs decreased HIF-1-mediated transcription under hypoxia to a similar extent as lower-dose TSA, contrasting the reported role of HDAC6 as a transcriptional repressor in other cell types. Moreover, HDAC6 inhibition completely blocked TSA effects on HIF-1 activity. HDAC6 associated with and deacetylated HSP90, an important cofactor for HIF-1 function in NP cells, and HDAC6 inhibition decreased p300 transactivation in NP cells. Taken together, these results suggest that although multiple class I and class IIa HDACs control HIF-1 stability, HDAC6, a class IIb HDAC, is a novel mediator of HIF-1 activity in NP cells possibly through promoting action of critical HIF-1 cofactors. © 2016 American Society for Bone and Mineral Research.
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Affiliation(s)
- Zachary R Schoepflin
- Department of Orthopaedic Surgery and Graduate Program in Cell and Developmental Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Irving M Shapiro
- Department of Orthopaedic Surgery and Graduate Program in Cell and Developmental Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Makarand V Risbud
- Department of Orthopaedic Surgery and Graduate Program in Cell and Developmental Biology, Thomas Jefferson University, Philadelphia, PA, USA
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9
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Shen T, Wang N, Yu X, Shi J, Li Q, Zhang C, Fu L, Wang S, Xing Y, Zheng X, Yu L, Zhu D. The Critical Role of Dynamin-Related Protein 1 in Hypoxia-Induced Pulmonary Vascular Angiogenesis. J Cell Biochem 2016; 116:1993-2007. [PMID: 25752284 DOI: 10.1002/jcb.25154] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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: 01/22/2015] [Accepted: 03/03/2015] [Indexed: 11/09/2022]
Abstract
Pulmonary arterial hypertension (PAH) is a lethal disease characterized by pulmonary vascular obstruction due in part to excessive pulmonary artery endothelial cells (PAECs) migration and proliferation. The mitochondrial fission protein dynamin-related protein-1 (DRP1) has important influence on pulmonary vascular remodeling. However, whether DRP1 participates in the development and progression of pulmonary vascular angiogenesis has not been reported previously. To test the hypothesis that DRP1 promotes the angiogenesis via promoting the proliferation, stimulating migration, and inhibiting the apoptosis of PAECs in mitochondrial Ca(2+)-dependent manner, we performed following studies. Using hemodynamic analysis and morphometric assay, we found that DRP1 mediated the elevation of right ventricular systemic pressure (RVSP), right heart hypertrophy, and increase of pulmonary microvessels induced by hypoxia. DRP1 inhibition reversed tube network formation in vitro stimulated by hypoxia. The mitochondrial Ca(2+) inhibited by hypoxia was recovered by DRP1 silencing. Moreover, pulmonary vascular angiogenesis promoted by DRP1 was reversed by the specific mitochondrial Ca(2+) uniporter inhibitor Ru360. In addition, DRP1 promoted the proliferation and migration of PAECs in mitochondrial Ca(2+)-dependent manner. Besides, DRP1 decreased mitochondrial membrane potential, reduced the DNA fragmentation, and inhibited the caspase-3 activation, which were all aggravated by Ru360. Therefore, these results indicate that the mitochondrial fission machinery promotes migration, facilitates proliferation, and prevents from apoptosis via mitochondrial Ca(2+)-dependent pathway in endothelial cells leading to pulmonary angiogenesis.
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Affiliation(s)
- Tingting Shen
- Department of Biopharmaceutical Sciences, College of Pharmacy, Harbin Medical University (Daqing), Daqing, China
| | - Na Wang
- Department of Biopharmaceutical Sciences, College of Pharmacy, Harbin Medical University (Daqing), Daqing, China
| | - Xiufeng Yu
- Department of Biopharmaceutical Sciences, College of Pharmacy, Harbin Medical University (Daqing), Daqing, China
| | | | | | - Chen Zhang
- Department of Biopharmaceutical Sciences, College of Pharmacy, Harbin Medical University (Daqing), Daqing, China
| | - Li Fu
- Department of Biopharmaceutical Sciences, College of Pharmacy, Harbin Medical University (Daqing), Daqing, China
| | - Shuang Wang
- Biopharmaceutical Key Laboratory of Heilongjiang Province, Harbin Medical University, Harbin, China
| | - Yan Xing
- Department of Pharmacology, College of Basic Medicine, Harbin Medical University, Daqing, China
| | - Xiaodong Zheng
- Department of Pathophysiology, College of Basic Medicine, Harbin Medical University, Daqing, China
| | - Lei Yu
- Department of Biopharmaceutical Sciences, College of Pharmacy, Harbin Medical University (Daqing), Daqing, China
| | - Daling Zhu
- Department of Biopharmaceutical Sciences, College of Pharmacy, Harbin Medical University (Daqing), Daqing, China.,Biopharmaceutical Key Laboratory of Heilongjiang Province, Harbin Medical University, Harbin, China
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10
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Smith H, Board M, Pellagatti A, Turley H, Boultwood J, Callaghan R. The Effects of Severe Hypoxia on Glycolytic Flux and Enzyme Activity in a Model of Solid Tumors. J Cell Biochem 2016; 117:1890-901. [PMID: 26755257 DOI: 10.1002/jcb.25488] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [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: 09/24/2015] [Accepted: 01/06/2016] [Indexed: 12/14/2022]
Abstract
Solid tumors contend with, and adapt to, a hostile micro-environment that includes limited availability of nutrient fuels and oxygen. The presence of hypoxia (O2 <5%) stabilizes the transcription factor Hif1 and results in numerous cellular adaptations including increased flux of glucose through glycolysis. Increasingly, more sophisticated analysis of tumor oxygenation has revealed large gradients of oxygen tension and significant regions under severe hypoxia (O2 ∼0.1%). The present investigation has demonstrated a significant increase in the glycolytic flux rate when tumor spheroids were exposed to 0.1% O2 . The severe hypoxia was associated with uniform pimonidazole adduct formation and elevated levels of Hif1α and c-Myc. This resulted in elevated expression of GLUT and MCT transporters, in addition to increased activity of PFK1 in comparison to that observed in normoxia. However, the protein expression and enzymatic capacity of HK2, G6PDH, PK, and LDH were all reduced by severe hypoxia. Clearly, the effects of exposure to severe hypoxia lead to a significantly abridged Hif1 response, yet one still able to elevate glycolytic flux and prevent loss of intermediates to anabolism. J. Cell. Biochem. 117: 1890-1901, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Hannah Smith
- Nuffield Department of Clinical Laboratory Sciences, John Radcliffe Hospital, The University of Oxford, Headington, UK
| | - Mary Board
- Nuffield Department of Clinical Laboratory Sciences, John Radcliffe Hospital, The University of Oxford, Headington, UK
| | - Andrea Pellagatti
- Nuffield Department of Clinical Laboratory Sciences, John Radcliffe Hospital, The University of Oxford, Headington, UK.,NIHR Biomedical Research Centre, Oxford, UK
| | - Helen Turley
- Nuffield Department of Clinical Laboratory Sciences, John Radcliffe Hospital, The University of Oxford, Headington, UK
| | - Jacqueline Boultwood
- Nuffield Department of Clinical Laboratory Sciences, John Radcliffe Hospital, The University of Oxford, Headington, UK.,NIHR Biomedical Research Centre, Oxford, UK
| | - Richard Callaghan
- Nuffield Department of Clinical Laboratory Sciences, John Radcliffe Hospital, The University of Oxford, Headington, UK.,Division of Biomedical Science and Biochemistry, Research School of Biology, The Australian National University Canberra, ACT 0200, Australia
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11
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Chen S, Sang N. Hypoxia-Inducible Factor-1: A Critical Player in the Survival Strategy of Stressed Cells. J Cell Biochem 2016; 117:267-78. [PMID: 26206147 PMCID: PMC4715696 DOI: 10.1002/jcb.25283] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [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: 07/15/2015] [Accepted: 07/20/2015] [Indexed: 12/31/2022]
Abstract
HIF-1 activation has been well known as an adaptive strategy to hypoxia. Recently it became clear that hypoxia was often accompanied by insufficient supply of glucose or amino acids as a common result of poor circulation that frequently occurs in solid tumors and ischemic lesions, creating a mixed nutrient insufficiency. In response to nutrient insufficiency, stressed cells elicit survival strategies including activation of AMPK and HIF-1 to cope with the stress. Particularly, in solid tumors, HIF-1 promotes cell survival and migration, stimulates angiogenesis, and induces resistance to radiation and chemotherapy. Interestingly, radiation and some chemotherapeutics are reported to trigger the activation of AMPK. Here we discuss the recent advances that may potentially link the stress responsive mechanisms including AMPK activation, ATF4 activation and the enhancement of Hsp70/Hsp90 function to HIF-1 activation. Potential implication and application of the stress-facilitated HIF-1 activation in solid tumors and ischemic disorders will be discussed. A better understanding of HIF-1 activation in cells exposed to stresses is expected to facilitate the design of therapeutic approaches that specifically modulate cell survival strategy.
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Affiliation(s)
- Shuyang Chen
- Department of Biology and Graduate Program of Biological Sciences, College of Arts and Sciences, Drexel University, Philadelphia, Pennsylvania
| | - Nianli Sang
- Department of Biology and Graduate Program of Biological Sciences, College of Arts and Sciences, Drexel University, Philadelphia, Pennsylvania
- Department of Pathology and Laboratory Medicine, Drexel University College of Medicine, Philadelphia, Pennsylvania
- Sydney Kimmel Cancer Center, Philadelphia, Pennsylvania
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12
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Lakatos K, Kalomoiris S, Merkely B, Nolta JA, Fierro FA. Mesenchymal Stem Cells Respond to Hypoxia by Increasing Diacylglycerols. J Cell Biochem 2016; 117:300-7. [PMID: 26212931 PMCID: PMC10695329 DOI: 10.1002/jcb.25292] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [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: 03/24/2015] [Accepted: 07/22/2015] [Indexed: 12/30/2022]
Abstract
Mesenchymal stem cells (MSC) are currently being tested clinically for a plethora of conditions, with most approaches relying on the secretion of paracrine signals by MSC to modulate the immune system, promote wound healing, and induce angiogenesis. Hypoxia has been shown to affect MSC proliferation, differentiation, survival and secretory profile. Here, we investigate changes in the lipid composition of human bone marrow-derived MSC after exposure to hypoxia. Using mass spectrometry, we compared the lipid profiles of MSC derived from five different donors, cultured for two days in either normoxia (control) or hypoxia (1% oxygen). Hypoxia induced a significant increase of total triglycerides, fatty acids and diacylglycerols (DG). Remarkably, reduction of DG levels using the phosphatidylcholine-specific phospholipase C inhibitor D609 inhibited the secretion of VEGF and Angiopoietin-2, but increased the secretion of interleukin-8, without affecting significantly their respective mRNA levels. Functionally, incubation of MSC in hypoxia with D609 inhibited the potential of the cells to promote migration of human endothelial cells in a wound/scratch assay. Hence, we show that hypoxia induces in MSC an increase of DG that may affect the angiogenic potential of these cells.
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Affiliation(s)
- Kinga Lakatos
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Stefanos Kalomoiris
- Institute for Regenerative Cures, University of California Davis, Sacramento, California
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Jan A. Nolta
- Institute for Regenerative Cures, University of California Davis, Sacramento, California
| | - Fernando A. Fierro
- Institute for Regenerative Cures, University of California Davis, Sacramento, California
- Department of Cell Biology and Human Anatomy, University of California Davis, Sacramento, California
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13
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Lin KH, Kuo CH, Kuo WW, Ho TJ, Pai P, Chen WK, Pan LF, Wang CC, Padma VV, Huang CY. NFIL3 suppresses hypoxia-induced apoptotic cell death by targeting the insulin-like growth factor 2 receptor. J Cell Biochem 2016; 116:1113-20. [PMID: 25536374 DOI: 10.1002/jcb.25067] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [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: 01/29/2014] [Revised: 12/14/2014] [Accepted: 12/18/2014] [Indexed: 11/08/2022]
Abstract
The insulin-like growth factor-II/mannose 6-phosphate receptor (IGF2R) over-expression correlates with heart disease progression. The IGF2R is not only an IGF2 clearance receptor, but it also triggers signal transduction, resulting in cardiac hypertrophy, apoptosis and fibrosis. The present study investigated the nuclear factor IL-3 (NFIL3), a transcription factor of the basic leucine zipper superfamily, and its potential pro-survival effects in cardiomyocytes. NFIL3 might play a key role in heart development and act as a survival factor in the heart, but the regulatory mechanisms are still unclear. IGF2 and IGF2R protein expression were highly increased in rat hearts subjected to hemorrhagic shock. IGF2R protein expression was also up-regulated in H9c2 cells exposed to hypoxia. Over-expression of NFIL3 in H9c2 cardiomyoblast cells inhibited the induction of hypoxia-induced apoptosis and down-regulated IGF2R expression levels. Gel shift assay, double-stranded DNA pull-down assay and chromatin immune-precipitation analyses indicated that NFIL3 binds directly to the IGF2R promoter region. Using a luciferase assay, we further observed NFIL3 repress IGF2R gene promoter activity. Our results demonstrate that NFIL3 is an important negative transcription factor, which through binding to the promoter of IGF2R, suppresses the apoptosis induced by IGF2R signaling in H9c2 cardiomyoblast cells under hypoxic conditions.
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Affiliation(s)
- Kuan-Ho Lin
- Graduate Institute of Clinical Medical Science, China Medical University, Taichung, Taiwan; College of Medicine, China Medical University, Taichung, 40402, Taiwan; Department of Emergency Medicine, China Medical University Hospital, Taichung, Taiwan
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14
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Zuo J, Wen M, Lei M, Peng X, Yang X, Liu Z. MiR-210 links hypoxia with cell proliferation regulation in human Laryngocarcinoma cancer. J Cell Biochem 2016; 116:1039-49. [PMID: 25639884 DOI: 10.1002/jcb.25059] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [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: 04/12/2014] [Accepted: 12/18/2014] [Indexed: 12/22/2022]
Abstract
The microRNA hsa-miR-210 (miR-210) is associated with hypoxia; however its function has not fully identified. In the present study, we aim to detect its role concerning proliferation in Laryngocarcinoma. We found that miR-210 was highly expressed in hypoxia, which inhibited proliferation by inducing cell cycle arrest in G1/G0 as well as apoptosis. We further identified that miR-210 targeted fibroblast growth factor receptor-like 1 (FGFRL1). Down regulation of FGFRL1 decreased cell proliferation by promoting proportion of cells in G1/G0 phase and decreasing in S and G2/M phases. Moreover, overexpression of FGFRL1 effectively released the miR-210-induced suppression of SCC10A cell proliferation. Expression of miR-210 repressed tumor xenograft growth in vivo as well. Together, our findings reveal a new mechanism of adaptation to hypoxia that miR-210 inhibits the proliferation via inducing cell cycle arrest and apoptosis by the targeting of FGFRL1. J. Cell. Biochem. 116: 1039-1049, 2015. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Jianhong Zuo
- State Key Laboratory of Respiratory Disease for Allergy at Shenzhen University, School of Medicine, Shenzhen University, Shenzhen, Guangdong, 518060, China; The Affiliated Nanhua Hospital, University of South China, Hengyang, Hunan, 421001, China; School of Medicine, University of South China, Hengyang, Hunan, 421001, China
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15
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Movafagh S, Crook S, Vo K. Regulation of hypoxia-inducible factor-1a by reactive oxygen species: new developments in an old debate. J Cell Biochem 2015; 116:696-703. [PMID: 25546605 DOI: 10.1002/jcb.25074] [Citation(s) in RCA: 313] [Impact Index Per Article: 34.8] [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: 12/17/2014] [Accepted: 12/18/2014] [Indexed: 01/04/2023]
Abstract
Hypoxia-Inducible Factor-1 (HIF-1) has been largely studied for its role in cell survival in hypoxic conditions. The regulation of HIF-1 is a complex process and involves a number of molecules and pathways. Among these mechanisms a direct regulatory role of reactive oxygen species (ROS) on HIF-1 alpha subunit has received a great deal of attention and the existing body of literature includes many contradictory findings. Other intermediates such as nitric oxide (NO), specific microRNAs (miR), and transcriptional and post-translational modification have also been implicated as players in ROS mediated HIF-1a regulation. The focus of this review is to present the past conflicting evidence along with more recent findings in order to relate various aspects of this complex process. Aside from the direct role of ROS on HIF-1a regulation under hypoxia and normoxia, we analyzed the effect of different sources and concentrations of NO and the interplay between superoxide (SO) and NO in this process. We also present findings on transcriptional and translational regulation of HIF-1a via ROS and the interplay with microRNAs in this process. This review further provides insight on ERK and PI3K/AKT signaling as a common mechanism relating several pathways of ROS mediated HIF-1a regulation. Ultimately further research and discovery regarding HIF-1 regulation by oxidative stress is warranted for better understanding of disease development and potential therapeutics for pathologies such as cancer, inflammatory diseases, and ischemia-reperfusion injury.
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Affiliation(s)
- Shahrzad Movafagh
- Department of Pharmacogenomics, Bernard J. Dunn School of Pharmacy, Shenandoah University, Ashburn, Virginia
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16
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Choi JH, Lim SM, Yoo YI, Jung J, Park JW, Kim GJ. Microenvironmental Interaction Between Hypoxia and Endothelial Cells Controls the Migration Ability of Placenta-Derived Mesenchymal Stem Cells via α4 Integrin and Rho Signaling. J Cell Biochem 2015; 117:1145-57. [PMID: 26448639 DOI: 10.1002/jcb.25398] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [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: 09/28/2015] [Accepted: 10/06/2015] [Indexed: 12/13/2022]
Abstract
Mesenchymal stem cells (MSCs) are a powerful source for cell therapy in degenerative diseases. The migration ability of MSCs is an important factor that enhances the therapeutic effect of the cells when they are transplanted into target tissues or organs. Hypoxia and the endothelial barrier, which are representative migration microenvironmental factors, are known to be regulated by the integrin-mediated pathway in several cancers. However, their regulatory mechanisms in MSCs remain unclear. Here, the objectives of the study were to compare the expression of markers related to integrin-mediated signaling in placenta-derived MSCs (PDMSCs) dependent on hypoxia and co-cultured with human umbilical vein endothelial cells (HUVECs) and to evaluate their correlations between migration ability and microenvironmetal factors including hypoxia and endothelial cells. The migration abilities of PDMSCs exposed to hypoxic conditions were significantly increased compared with normal fibroblasts (WI-38) and control (P < 0.05). Interestingly, decreased integrin α4 in PDMSCs under hypoxia induce to increase migration abilities of PDMSCs. Also, Rho family-related markers were significantly increased in PDMSCs under hypoxic conditions compared with normoxia (P < 0.05). Furthermore, the migration ability of PDMSCs was decreased by Rho kinase inhibitor treatment (Y-27632) and co-culturing with HUVECs in an ex vivo system. ROCK activity was increased by inhibiting integrin α4 with HUVECs and hypoxia compared with the absence of HUVECs and under normoxia. The findings suggest microenvironment event by hypoxia and the interaction with endothelial cells may be useful as a regulator of MSC migration and provide insight into the migratory mechanism of MSCs in stem cell-based therapy.
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Affiliation(s)
- Jong Ho Choi
- Department of Biomedical Science, CHA University, Seongnam-si, Republic of Korea
| | - Seung Mook Lim
- Department of Biomedical Science, CHA University, Seongnam-si, Republic of Korea
| | - Yong In Yoo
- Department of Biomedical Science, CHA University, Seongnam-si, Republic of Korea
| | - Jieun Jung
- Department of Nanobiomedical Science, Dankook University, Cheonan-si, Republic of Korea
| | - Jong-Won Park
- Department of Biomedical Sciences and Pharmacology, Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Gi Jin Kim
- Department of Biomedical Science, CHA University, Seongnam-si, Republic of Korea
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17
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Grella A, Kole D, Holmes W, Dominko T. FGF2 Overrides TGFβ1-Driven Integrin ITGA11 Expression in Human Dermal Fibroblasts. J Cell Biochem 2015; 117:1000-8. [PMID: 26403263 DOI: 10.1002/jcb.25386] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [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: 09/22/2015] [Accepted: 09/23/2015] [Indexed: 12/28/2022]
Abstract
Deposition of collagen-based extracellular matrix by fibroblasts during wound healing leads to scar formation--a typical outcome of the healing process in soft tissue wounds. The process can, however, be skewed in favor of tissue regeneration by manipulation of wound environment. Low oxygen conditions and supplementation with FGF2 provide extracellular cues that drive wound fibroblasts towards a pro-regenerative phenotype. Under these conditions, fibroblasts dramatically alter expression of many genes among which the most significantly deregulated are extracellular matrix and adhesion molecules. Here we investigate the mechanism of a collagen I binding integrin α11 (ITGA11) deregulation in response to low oxygen-mediated FGF2 effects in dermal fibroblasts. Using RT-PCR, qRT-PCR, Western blotting, and immunocytochemistry, we describe significant down-regulation of ITGA11. Decrease in ITGA11 is associated with its loss from focal adhesions. We show that loss of ITGA11 requires FGF2 induced ERK1/2 activity and in the presence of FGF2, ITGA11 expression cannot be rescued by TGFβ1, a potent activator of ITGA11. Our results indicate that FGF2 may be redirecting fibroblasts towards an anti-fibrotic phenotype by overriding TGFβ1 mediated ITGA11 expression.
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Affiliation(s)
- Alexandra Grella
- Department of Biology and Biotechnology, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts, 01609
| | - Denis Kole
- Department of Biology and Biotechnology, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts, 01609
| | - William Holmes
- Department of Biology and Biotechnology, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts, 01609
| | - Tanja Dominko
- Department of Biology and Biotechnology, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts, 01609.,Center for Biomedical Sciences and Engineering, University of Nova Gorica, Nova Gorica 5000, Slovenia
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18
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Lakhter AJ, Lahm T, Broxmeyer HE, Naidu SR. Golgi Associated HIF1a Serves as a Reserve in Melanoma Cells. J Cell Biochem 2015; 117:853-9. [PMID: 26375488 DOI: 10.1002/jcb.25381] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 06/01/2015] [Accepted: 09/14/2015] [Indexed: 11/09/2022]
Abstract
Hypoxia-inducible factor-1alpha (HIF1a) is a key transcriptional regulator that enables cellular metabolic adaptation to low levels of oxygen. Multiple mechanisms, including lysosomal degradation, control the levels of HIF1a protein. Here we show that HIF1a protein degradation is resistant to lysosomal inhibition and that HIF1a is associated with the Golgi compartment in melanoma cells. Although pharmacological inhibitors of prolyl hydroxylation, neddylation and the proteasome inhibited degradation of HIF1a, attenuation of lysosomal activity with chloroquine did not alter the levels of HIF1a or its association with Golgi. Pharmacological disruption of Golgi resulted in nuclear accumulation of HIF1a. However, blockade of ER-Golgi protein transport in hypoxia reduced the transcript levels of HIF1a target genes. These findings suggest a possible role for the oxygen-dependent protein folding process from the ER-Golgi compartment in fine-tuning HIF1a transcriptional output.
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Affiliation(s)
- Alexander J Lakhter
- Department of Dermatology, Indiana University School of Medicine, Indianapolis, Indiana, 46202
| | - Tim Lahm
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, 46202
| | - Hal E Broxmeyer
- Department of Microbiology/Immunology, Indiana University School of Medicine, Indianapolis, Indiana, 46202
| | - Samisubbu R Naidu
- Department of Dermatology, Indiana University School of Medicine, Indianapolis, Indiana, 46202
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19
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Saini U, Gumina RJ, Wolfe B, Kuppusamy ML, Kuppusamy P, Boudoulas KD. Preconditioning mesenchymal stem cells with caspase inhibition and hyperoxia prior to hypoxia exposure increases cell proliferation. J Cell Biochem 2014; 114:2612-23. [PMID: 23794477 DOI: 10.1002/jcb.24609] [Citation(s) in RCA: 33] [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] [Received: 12/12/2012] [Accepted: 06/10/2013] [Indexed: 12/12/2022]
Abstract
Myocardial infarction is a leading cause of mortality and morbidity worldwide. Occlusion of a coronary artery produces ischemia and myocardial necrosis that leads to left ventricular (LV) remodeling, dysfunction, and heart failure. Stem cell therapy may decrease infarct size and improve LV function; the hypoxic environment, however, following a myocardial infarction may result in apoptosis, which in turn decreases survival of transplanted stem cells. Therefore, the effects of preconditioned mesenchymal stem cells (MSC) with hyperoxia (100% oxygen), Z-VAD-FMK pan-caspase inhibitor (CI), or both in a hypoxic environment in order to mimic conditions seen in cardiac tissue post-myocardial infarction were studied in vitro. MSCs preconditioned with hyperoxia or CI significantly decreased apoptosis as suggested by TUNEL assay and Annexin V analysis using fluorescence assisted cell sorting. These effects were more profound when both, hyperoxia and CI, were used. Additionally, gene and protein expression of caspases 1, 3, 6, 7, and 9 were down-regulated significantly in MSCs preconditioned with hyperoxia, CI, or both, while the survival markers Akt1, NF-κB, and Bcl-2 were significantly increased in preconditioned MSCs. These changes ultimately resulted in a significant increase in MSC proliferation in hypoxic environment as determined by BrdU assays compared to MSCs without preconditioning. These effects may prove to be of great clinical significance when transplanting stem cells into the hypoxic myocardium of post-myocardial infarction patients in order to attenuate LV remodeling and improve LV function.
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Affiliation(s)
- Uksha Saini
- Department of Medicine, Division of Cardiovascular Medicine, The Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio
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20
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CRAVEN CW, CHINN HI, MacVICAR RW. Effect of carrot diet and restricted feeding on the resistance of the rat to hypoxia. J Aviat Med 1950; 21:256-8. [PMID: 15436396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
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21
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ROUGIER G, HIBERT Y. [Changes in the frequency of tetanizing excitations of skeletal muscle under the influence of hypoxemia; additional results]. C R Seances Soc Biol Fil 1947; 141:896. [PMID: 18906271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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22
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OCHWADT B. [About Bicarbonate Excretion and Carbonic Acid System in Urine During Acute Hypoxia]. Pflugers Arch Gesamte Physiol Menschen Tiere 1947; 249:452-469. [PMID: 18905817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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