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Yang X, Tian S, Fan L, Niu R, Yan M, Chen S, Zheng M, Zhang S. Integrated regulation of chondrogenic differentiation in mesenchymal stem cells and differentiation of cancer cells. Cancer Cell Int 2022; 22:169. [PMID: 35488254 PMCID: PMC9052535 DOI: 10.1186/s12935-022-02598-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 04/19/2022] [Indexed: 11/15/2022] Open
Abstract
Chondrogenesis is the formation of chondrocytes and cartilage tissues and starts with mesenchymal stem cell (MSC) recruitment and migration, condensation of progenitors, chondrocyte differentiation, and maturation. The chondrogenic differentiation of MSCs depends on co-regulation of many exogenous and endogenous factors including specific microenvironmental signals, non-coding RNAs, physical factors existed in culture condition, etc. Cancer stem cells (CSCs) exhibit self-renewal capacity, pluripotency and cellular plasticity, which have the potential to differentiate into post-mitotic and benign cells. Accumulating evidence has shown that CSCs can be induced to differentiate into various benign cells including adipocytes, fibrocytes, osteoblast, and so on. Retinoic acid has been widely used in the treatment of acute promyelocytic leukemia. Previous study confirmed that polyploid giant cancer cells, a type of cancer stem-like cells, could differentiate into adipocytes, osteocytes, and chondrocytes. In this review, we will summarize signaling pathways and cytokines in chondrogenic differentiation of MSCs. Understanding the molecular mechanism of chondrogenic differentiation of CSCs and cancer cells may provide new strategies for cancer treatment.
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Affiliation(s)
- Xiaohui Yang
- Nankai University School of Medicine, Nankai University, Tianjin, 300071, People's Republic of China
| | - Shifeng Tian
- Graduate School, Tianjin Medical University, Tianjin, 300070, People's Republic of China
| | - Linlin Fan
- Department of Pathology, Graduate School, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, People's Republic of China
| | - Rui Niu
- Department of Pathology, Graduate School, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, People's Republic of China
| | - Man Yan
- Department of Pathology, Graduate School, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, People's Republic of China
| | - Shuo Chen
- Department of Colorectal Surgery, Tianjin Union Medical Center, Tianjin, People's Republic of China
| | - Minying Zheng
- Department of Pathology, Tianjin Union Medical Center, Tianjin, 300071, People's Republic of China
| | - Shiwu Zhang
- Department of Pathology, Tianjin Union Medical Center, Tianjin, 300071, People's Republic of China.
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Impact of perlecan, a core component of basement membrane, on regeneration of cartilaginous tissues. Acta Biomater 2021; 135:13-26. [PMID: 34454085 DOI: 10.1016/j.actbio.2021.08.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 08/02/2021] [Accepted: 08/20/2021] [Indexed: 02/03/2023]
Abstract
As an indispensable component of the extracellular matrix, perlecan (Pln) plays an essential role in cartilaginous tissue function. Although there exist studies suggesting that Pln expressed by cartilaginous tissues is critical for chondrogenesis, few papers have discussed the potential impact Pln may have on cartilage regeneration. In this review, we delineate Pln structure, biomechanical properties, and interactive ligands-which together contribute to the effect Pln has on cartilaginous tissue development. We also review how the signaling pathways of Pln affect cartilage development and scrutinize the potential application of Pln to divisions of cartilage regeneration, spanning vascularization, stem cell differentiation, and biomaterial improvement. The aim of this review is to deepen our understanding of the spatial and temporal interactions that occur between Pln and cartilaginous tissue and ultimately apply Pln in scaffold design to improve cell-based cartilage engineering and regeneration. STATEMENT OF SIGNIFICANCE: As a key component of the basement membrane, Pln plays a critical role in tissue development and repair. Recent findings suggest that Pln existing in the pericellular matrix surrounding mature chondrocytes is actively involved in cartilage regeneration and functionality. We propose that Pln is essential to developing an in vitro matrix niche within biological scaffolds for cartilage tissue engineering.
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Deng Y, Lei G, Lin Z, Yang Y, Lin H, Tuan RS. Engineering hyaline cartilage from mesenchymal stem cells with low hypertrophy potential via modulation of culture conditions and Wnt/β-catenin pathway. Biomaterials 2018; 192:569-578. [PMID: 30544046 DOI: 10.1016/j.biomaterials.2018.11.036] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 11/24/2018] [Accepted: 11/30/2018] [Indexed: 12/27/2022]
Abstract
Mesenchymal stem cells (MSCs) represent a promising cell source to regenerate articular cartilage, but current chondroinduction protocols, commonly using transforming growth factor-β (TGFβ), lead to concomitant chondrocytic hypertrophy with ossification risk. Here, we showed that a 14-day culture of MSC-laden hyaluronic acid hydrogel in the presence of TGFβ, followed by 7 days culture in TGFβ-free medium, with the supplement of Wnt/β-catenin inhibitor XAV939 from day 10-21, resulted in significantly reduced hypertrophy phenotype. The stability of the hyaline phenotype of the MSC-derived cartilage, generated with a standard protocol (Control) or the optimized (Optimized) method developed in this study, was further examined through intramuscular implantation in nude mice. After 4 weeks, constructs from the Control group showed obvious mineralization; in contrast, the Optimized group displayed no signs of mineralization, and maintained cartilaginous histology. Further analysis showed that TGFβ treatment time affected p38 expression, while exposure to XAV939 significantly inhibited P-Smad 1/5 level, which together resulted in decreased level of Runx2. These findings suggest a novel treatment regimen to generate hyaline cartilage from human MSCs-loaded scaffolds, which have a minimal risk of eliciting endochondral ossification.
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Affiliation(s)
- Yuhao Deng
- Department of Orthopaedic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China; Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; Xiangya Third Hospital, Central South University, Changsha, Hunan, China
| | - Guanghua Lei
- Department of Orthopaedic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Zixuan Lin
- Department of Orthopaedic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China; Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Yuanheng Yang
- Department of Orthopaedic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China; Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; Xiangya Third Hospital, Central South University, Changsha, Hunan, China
| | - Hang Lin
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA.
| | - Rocky S Tuan
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, PA, 15261, USA; The Chinese University of Hong Kong, Hong Kong, China.
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Xu N, Wang BH, Zhou Q, Ouyang Y, Gong W, Tian H, Li X, Jiang C. Expression of Halo-hFGF18 and study of its effect on differentiation of ATDC5 cells. Protein Expr Purif 2018; 155:8-14. [PMID: 30416101 DOI: 10.1016/j.pep.2018.10.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 10/10/2018] [Accepted: 10/23/2018] [Indexed: 01/14/2023]
Abstract
Fibroblast growth factor 18 (FGF18) is a member of the fibroblast growth factor family and important in cartilage growth and development. However, the mechanism by which FGF18 mediates its biological functions is still unclear. In our study, we expressed the rhFGF18 protein fused to a HaloTag, (Halo-rhFGF18). MTT assay results indicated that both rhFGF18 and Halo-rhFGF18 have similar biological activities in NIH3T3 cells. However, basic FGF and acidic FGF were more potent than both rhFGF18 and Halo-rhFGF18. Confocal imaging data indicated that the red fluorescence labeled Halo-rhFGF18 strongly bound to ATDC5 cells and stimulated their proliferation and differentiation, which suggests that glycosaminoglycans may be involved in mediating the biological effects of rhFGF18 in ATDC5 cells. Moreover, western blot results demonstrated that, in ATDC5 cells, ERK1/2 signaling is activated upon stimulation with rhFGF18. Our results may open doors for the use of rhFGF18 as a drug to promote cartilage growth.
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Affiliation(s)
- Nuo Xu
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, Zhejiang, China
| | - Bao Hui Wang
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, Zhejiang, China
| | - Qianyun Zhou
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, Zhejiang, China
| | - Yuehong Ouyang
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, Zhejiang, China
| | - Weiyue Gong
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Haishan Tian
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Xiaokun Li
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China.
| | - Chao Jiang
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, Zhejiang, China.
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A review of crosstalk between MAPK and Wnt signals and its impact on cartilage regeneration. Cell Tissue Res 2014; 358:633-49. [PMID: 25312291 DOI: 10.1007/s00441-014-2010-x] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 09/11/2014] [Indexed: 12/25/2022]
Abstract
Chondrogenesis is a developmental process that is controlled and coordinated by many growth and differentiation factors, in addition to environmental factors that initiate or suppress cellular signaling pathways and the transcription of specific genes in a temporal-spatial manner. As key signaling molecules in regulating cell proliferation, homeostasis and development, both mitogen-activated protein kinases (MAPK) and the Wnt family participate in morphogenesis and tissue patterning, playing important roles in skeletal development, especially chondrogenesis. Recent findings suggest that both signals are also actively involved in arthritis and related diseases. Despite the implication that crosstalk between MAPK and Wnt signaling has a significant function in cancer, few studies have summarized this interaction and its regulation of chondrogenesis. In this review, we focus on MAPK and Wnt signaling, referencing their relationships in various types of cells and particularly to their influence on chondrogenesis and cartilage development. We also discuss the interactions between MAPK and Wnt signaling with respect to cartilage-related diseases such as osteoarthritis and explore potential therapeutic targets for disease treatments.
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Parreno J, Raju S, Niaki MN, Andrejevic K, Jiang A, Delve E, Kandel R. Expression of type I collagen and tenascin C is regulated by actin polymerization through MRTF in dedifferentiated chondrocytes. FEBS Lett 2014; 588:3677-84. [PMID: 25150168 DOI: 10.1016/j.febslet.2014.08.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 08/05/2014] [Accepted: 08/11/2014] [Indexed: 12/12/2022]
Abstract
This study examined actin regulation of fibroblast matrix genes in dedifferentiated chondrocytes. We demonstrated that dedifferentiated chondrocytes exhibit increased actin polymerization, nuclear localization of myocardin related transcription factor (MRTF), increased type I collagen (col1) and tenascin C (Tnc) gene expression, and decreased Sox9 gene expression. Induction of actin depolymerization by latrunculin treatment or cell rounding, reduced MRTF nuclear localization, repressed col1 and Tnc expression, and increased Sox9 gene expression in dedifferentiated chondrocytes. Treatment of passaged chondrocytes with MRTF inhibitor repressed col1 and Tnc expression, but did not affect Sox9 expression. Our results show that actin polymerization regulates fibroblast matrix gene expression through MRTF in passaged chondrocytes.
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Affiliation(s)
- Justin Parreno
- CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, University of Toronto, Toronto, Canada; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada; Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Canada
| | - Sneha Raju
- CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, University of Toronto, Toronto, Canada; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Mortah Nabavi Niaki
- CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, University of Toronto, Toronto, Canada; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada
| | - Katarina Andrejevic
- CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, University of Toronto, Toronto, Canada; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada; Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Canada
| | - Amy Jiang
- CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, University of Toronto, Toronto, Canada; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Elizabeth Delve
- CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, University of Toronto, Toronto, Canada; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada
| | - Rita Kandel
- CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, University of Toronto, Toronto, Canada; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada; Department of Laboratory Medicine and Pathobiology, University of Toronto, Canada; Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada.
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Takács R, Matta C, Somogyi C, Juhász T, Zákány R. Comparative analysis of osteogenic/chondrogenic differentiation potential in primary limb bud-derived and C3H10T1/2 cell line-based mouse micromass cultures. Int J Mol Sci 2013; 14:16141-67. [PMID: 23921684 PMCID: PMC3759904 DOI: 10.3390/ijms140816141] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 07/03/2013] [Accepted: 07/04/2013] [Indexed: 12/13/2022] Open
Abstract
Murine micromass models have been extensively applied to study chondrogenesis and osteogenesis to elucidate pathways of endochondral bone formation. Here we provide a detailed comparative analysis of the differentiation potential of micromass cultures established from either BMP-2 overexpressing C3H10T1/2 cells or mouse embryonic limb bud-derived chondroprogenitor cells, using micromass cultures from untransfected C3H10T1/2 cells as controls. Although the BMP-2 overexpressing C3H10T1/2 cells failed to form chondrogenic nodules, cells of both models expressed mRNA transcripts for major cartilage-specific marker genes including Sox9, Acan, Col2a1, Snorc, and Hapln1 at similar temporal sequence, while notable lubricin expression was only detected in primary cultures. Furthermore, mRNA transcripts for markers of osteogenic differentiation including Runx2, Osterix, alkaline phosphatase, osteopontin and osteocalcin were detected in both models, along with matrix calcification. Although the adipogenic lineage-specific marker gene FABP4 was also expressed in micromass cultures, Oil Red O-positive cells along with PPARγ2 transcripts were only detected in C3H10T1/2-derived micromass cultures. Apart from lineage-specific marker genes, pluripotency factors (Nanog and Sox2) were also expressed in these models, reflecting on the presence of various mesenchymal lineages as well as undifferentiated cells. This cellular heterogeneity has to be taken into consideration for the interpretation of data obtained by using these models.
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Affiliation(s)
- Roland Takács
- Department of Anatomy, Histology and Embryology, Medical and Health Science Centre, University of Debrecen, Nagyerdei krt. 98, H-4032 Debrecen, Hungary.
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Li J, Pei M. Optimization of an in vitro three-dimensional microenvironment to reprogram synovium-derived stem cells for cartilage tissue engineering. Tissue Eng Part A 2010; 17:703-12. [PMID: 20929284 DOI: 10.1089/ten.tea.2010.0339] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Adult stem cells gradually lose their stemness when plated in monolayer culture after isolation from their in vivo niche. In this study, we hypothesized that the in vitro microenvironment can be optimized by modulating oxygen tension and mitotic signal in a tissue-specific extracellular matrix (ECM) deposited by synovium-derived stem cells (SDSCs) to rejuvenate expanded SDSC proliferation and chondrogenic potential. Passage 3 SDSCs were plated on either SDSC-derived ECM or plastic flask and incubated in either hypoxia (5% O(2)) or normoxia (21% O(2)) with or without the supplementation of 10 ng/mL of basic fibroblast growth factor-2 (FGF-2) for 7 days, followed by pellet culture in a serum-free chondrogenic medium for 14 days. Our data showed that, compared with the mitotic effect of FGF-2 on SDSCs, ECM expansion greatly enhanced SDSC proliferation while retaining SDSC stem cell characteristics. More importantly, ECM pretreatment yielded SDSC pellets with a comparable chondrogenic index to FGF-2 pretreatment, both of which were much higher than SDSC expansion on plastic flask alone. FGF-2 pretreatment led to the highest glycosaminoglycans and DNA content; intriguingly, it also contributed to the highest expression level of hypertrophic marker genes. Surprisingly, the hypertrophic marker genes could be downregulated if the pretreatment was combined with hypoxia or ECM. The combination of hypoxia, FGF-2, and SDSC-derived ECM contributed to the highest cell number in SDSC expansion. Our study indicates that the three-dimensional microenvironment for ex vivo expansion can be optimized to provide high-quality stem cells for stem cell-based cartilage defect repair.
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Affiliation(s)
- Jingting Li
- Division of Exercise Physiology, Department of Orthopaedics, West Virginia University, Morgantown, WV 26506-9196, USA
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Solchaga LA, Penick K, Goldberg VM, Caplan AI, Welter JF. Fibroblast growth factor-2 enhances proliferation and delays loss of chondrogenic potential in human adult bone-marrow-derived mesenchymal stem cells. Tissue Eng Part A 2010; 16:1009-19. [PMID: 19842915 DOI: 10.1089/ten.tea.2009.0100] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
We compared human mesenchymal stem cells (hMSCs), expanded long term with and without fibroblast growth factor (FGF) supplementation, with respect to proliferation, and the ability to undergo chondrogenesis in vitro. hMSCs expanded in FGF-supplemented medium proliferated more rapidly than the control cells. Aggregates of FGF-treated cells exhibited chondrogenic differentiation at all passages tested although, in some preparations, differentiation was diminished after seventh passage. Aggregates made with control cells differentiated along the chondrogenic lineage after first passage but exhibited only marginal differentiation after fourth and failed to form cartilage after seventh passage. Microarray analysis of gene expression identified 334 transcripts differentially expressed in fourth passage control cells that had reduced chondrogenic potential, compared with the fourth passage FGF-treated cells that retained this capacity, and 243 transcripts that were differentially expressed when comparing them to the first passage control cells that were also capable of differentiating into chondrocytes. The intersection of these analyses yielded 49 transcripts differentially expressed in cells that exhibited chondrogenic differentiation in vitro compared with the cells that did not. Among these, angiopoietin 1, secreted frizzled-related protein 1, and six transmembrane epithelial antigen of the prostate 1 appear to be of higher relevance. These preliminary data must now be validated to verify whether different gene expression profiles translate into functional differences. In summary, these findings suggest that the chondrogenic potential of hMSCs is vulnerable to cell expansion and that care should be exercised when expanding these cells for cartilage tissue engineering applications. Supplementation with FGF-2 allows reaching target cell numbers more rapidly and extends the level of expansion within which these cells are useful for tissue-engineered cartilage repair.
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Affiliation(s)
- Luis A Solchaga
- Division of Hematology and Oncology, Department of General Medical Sciences, Case Western Reserve University School of Medicine, Cleveland, OH 44106-7080, USA.
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Bobick BE, Matsche AI, Chen FH, Tuan RS. The ERK5 and ERK1/2 signaling pathways play opposing regulatory roles during chondrogenesis of adult human bone marrow-derived multipotent progenitor cells. J Cell Physiol 2010; 224:178-86. [PMID: 20232315 DOI: 10.1002/jcp.22120] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Adult human bone marrow-derived multipotent progenitor cells (MPCs) are able to differentiate into a variety of specialized cell types, including chondrocytes, and are considered a promising candidate cell source for use in cartilage tissue engineering. In this study, we examined the regulation of MPC chondrogenesis by mitogen-activated protein kinases in an attempt to better understand how to generate hyaline cartilage in the laboratory that more closely resembles native tissue. Specifically, we employed the high-density pellet culture model system to assess the roles of ERK5 and ERK1/2 pathway signaling in MPC chondrogenesis. Western blotting revealed that high levels of ERK5 phosphorylation correlate with low levels of MPC chondrogenesis and that as TGF-beta 3-enhanced MPC chondrogenesis proceeds, phospho-ERK5 levels steadily decline. Conversely, levels of phospho-ERK1/2 paralleled the progression of MPC chondrogenesis. siRNA-mediated knockdown of ERK5 pathway components MEK5 and ERK5 resulted in increased MPC pellet mRNA transcript levels of the cartilage-characteristic marker genes SOX9, COL2A1, AGC, L-SOX5, and SOX6, as well as enhanced accumulation of SOX9 protein, collagen type II protein, and Alcian blue-stainable proteoglycan. In contrast, knockdown of ERK1/2 pathway members MEK1 and ERK1 decreased expression of all chondrogenic markers tested. Finally, overexpression of MEK5 and ERK5 also depressed MPC chondrogenesis, as indicated by diminished activity of a co-transfected collagen II promoter-luciferase reporter construct. In conclusion, our results suggest a novel role for the ERK5 pathway as an important negative regulator of adult human MPC chondrogenesis and illustrate that the ERK5 and ERK1/2 kinase cascades play opposing roles regulating MPC cartilage formation.
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Affiliation(s)
- Brent E Bobick
- Cartilage Biology and Orthopaedics Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892, USA
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Bobick BE, Tuan RS, Chen FH. The intermediate filament vimentin regulates chondrogenesis of adult human bone marrow-derived multipotent progenitor cells. J Cell Biochem 2010; 109:265-76. [PMID: 19937731 DOI: 10.1002/jcb.22419] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Cytoskeletal proteins play important regulatory roles in a variety of cellular processes, including proliferation, migration, and differentiation. However, whereas actin and tubulin have established roles regulating developmental chondrogenesis, there is no evidence supporting a function for the intermediate filament vimentin in embryonic cartilage formation. We hypothesized that vimentin may regulate the chondrogenic differentiation of adult multipotent progenitor cells (MPCs), such as those involved in cartilage formation during bone fracture repair. As our model of adult progenitor cell chondrogenesis, we employed high-density pellet cultures of human bone marrow-derived MPCs. siRNA-mediated knockdown of vimentin mRNA and protein triggered a reduction in the extent of MPC cartilage formation, as evidenced by depressed accumulation of mRNAs for the cartilage-specific marker genes aggrecan and collagen type II, as well as reduced levels of Alcian blue-stainable proteoglycan and collagen II protein in the extracellular matrix. Moreover, mRNA and protein levels for the chondro-regulatory transcription factors SOX5, SOX6, and SOX9 were diminished by vimentin knockdown. Depleted cellular vimentin also induced a drastic reduction in PKA phosphorylation levels but did not affect the phosphorylation of multiple other chondro-regulatory kinases and transcription factors, including ERK1/2, p38, Smad2, and Smad1/5/8. Importantly, siRNA-mediated knockdown of PKA C-alpha mRNA and protein mimicked the reduction in chondrogenesis caused by diminished cellular vimentin. Finally, overexpression of vimentin in MPCs significantly enhanced the activity of a transfected collagen II promoter-luciferase reporter gene. In conclusion, we describe a novel role for the intermediate filament vimentin as a positive regulator of adult human bone marrow-derived MPC chondrogenesis.
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Affiliation(s)
- Brent E Bobick
- Cartilage Biology and Orthopaedics Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892, USA
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Blain EJ. Involvement of the cytoskeletal elements in articular cartilage homeostasis and pathology. Int J Exp Pathol 2009; 90:1-15. [PMID: 19200246 DOI: 10.1111/j.1365-2613.2008.00625.x] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The cytoskeleton of all cells is a three-dimensional network comprising actin microfilaments, tubulin microtubules and intermediate filaments. Studies in many cell types have indicated roles for these cytoskeletal proteins in many diverse cellular processes including alteration of cell shape, movement of organelles, migration, endocytosis, secretion, cell division and extracellular matrix assembly. The cytoskeletal networks are highly organized in structure enabling them to fulfil their biological functions. This review will primarily focus on the organization and function of the three major cytoskeletal networks in articular cartilage chondrocytes. Articular cartilage is a major load-bearing tissue of the synovial joint; it is well known that the cytoskeleton acts as a physical interface between the chondrocytes and the extracellular matrix in 'sensing' mechanical stimuli. The effect of mechanical load on cytoskeletal element expression and organization will also be reviewed. Abnormal mechanical load is widely believed to be a risk factor for the development of osteoarthritis. Several studies have intimated that the major cytoskeletal networks are disorganized or often absent in osteoarthritic cartilage chondrocytes. The implications and possible reasoning for this are more widely discussed and placed into context with their potential relevance to disease and therapeutic strategies.
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Affiliation(s)
- Emma J Blain
- Connective Tissue Biology Laboratories, School of Biosciences, Cardiff University, Cardiff, UK.
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Involvement of Gas7 along the ERK1/2 MAP kinase and SOX9 pathway in chondrogenesis of human marrow-derived mesenchymal stem cells. Osteoarthritis Cartilage 2008; 16:1403-12. [PMID: 18455446 DOI: 10.1016/j.joca.2008.03.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2007] [Accepted: 03/24/2008] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The growth-arrest-specific protein, Gas7, has been shown to be involved in reorganization of the cytoskeleton and for inducing changes in cell shape during cell differentiation. The goals of this study were to investigate the novel role of human Gas7 (hGas7) in chondrogenic differentiation of human mesenchymal stem cells (hMSCs) and to identify the relationship between hGas7, extracellular signal-regulated kinase (ERK1/2) and SOX9 in the chondrogenic pathway. METHODS Bone marrow-derived hMSCs were induced to undergo chondrogenic differentiation with transforming growth factor-beta1 (TGF-beta1) in an aggregate culture system. The expression of hGas7 and SOX9 and phosphorylation of ERK1/2 at multiple time points were investigated. Chondrogenic capacity was evaluated by the size of aggregates, by glycosaminoglycan content, and by type II collagen and proteoglycan deposition after interfering with expression of hGas7, ERK1/2 or SOX9. To delineate the functional role of these genes in chondrogenesis, inhibition of individual gene's expression in hMSCs, by antisense oligonucleotides or interference RNA (siRNA), and the effect on chondrogenic differentiation were also investigated. RESULTS Treatment of hMSCs with TGF-beta1 resulted in a transient up-regulation of hGas7b, one of the hGas7 isoforms (day 3-day 5), a transient phosphorylation of ERK1/2 (0.5-4 h) and an up-regulation of SOX9 (2 h to day 14). Transient expression of hGas7b was also detected in hMSCs by reverse transcription-polymerase chain reaction at day 2 and day 3 following TGF-beta1 treatment. Interference with hGas7b production by hGas7b-specific antisense oligonucleotide or inhibition of p-ERK with PD98059, a specific inhibitor of ERK signaling pathway, or interference with SOX9 production by SOX9 siRNA all caused adverse effects of chondrogenic differentiation of hMSCs. Meanwhile, inhibition of p-ERK or SOX9 both blocked the expression of hGas7b. However, the p-ERK and SOX9 pathway was not affected by inhibition of hGas7b. CONCLUSION These results provide evidence that the transient expression of hGas7b, regulated by activation of ERK1/2 and SOX9 pathway, is essential for chondrogenic differentiation of hMSCs.
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Bobick BE, Kulyk WM. Regulation of cartilage formation and maturation by mitogen-activated protein kinase signaling. ACTA ACUST UNITED AC 2008; 84:131-54. [PMID: 18546337 DOI: 10.1002/bdrc.20126] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The majority of bones comprising the adult vertebrate skeleton are generated from hyaline cartilage templates that form during embryonic development. A process known as endochondral ossification is responsible for the conversion of these transient cartilage anlagen into mature, calcified bone. Endochondral ossification is a highly regulated, multistep cell specification program involving the initial differentiation of prechondrogenic mesenchymal cells into hyaline chondrocytes, terminal differentiation of hyaline chondrocytes into hypertrophic chondrocytes, and finally, apoptosis of hypertrophic chondrocytes followed by bone matrix deposition. Recently, extensive research has been carried out describing roles for the three major mitogen-activated protein kinase (MAPK) signaling pathways, the extracellular signal-regulated kinase 1/2 (ERK1/2), p38, and c-jun N-terminal kinase (JNK) pathways, in the successive stages of chondrogenic differentiation. In this review, we survey this research examining the involvement of ERK1/2, p38, and JNK pathway signaling in all aspects of the chondrogenic differentiation program from embryonic through postnatal stages of development. In addition, we summarize evidence from in vitro studies examining MAPK function in immortalized chondrogenic cell lines and adult mesenchymal stem cells. We also provide suggestions for future studies that may help ameliorate existing confusion concerning the specific roles of MAPK signaling at different stages of chondrogenesis.
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Affiliation(s)
- Brent E Bobick
- Cartilage Biology and Orthopaedics Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, USA
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15
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Pala D, Kapoor M, Woods A, Kennedy L, Liu S, Chen S, Bursell L, Lyons KM, Carter DE, Beier F, Leask A. Focal adhesion kinase/Src suppresses early chondrogenesis: central role of CCN2. J Biol Chem 2008; 283:9239-47. [PMID: 18276598 PMCID: PMC2431031 DOI: 10.1074/jbc.m705175200] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2007] [Revised: 01/22/2008] [Indexed: 12/28/2022] Open
Abstract
Adhesive signaling plays a key role in cellular differentiation, including in chondrogenesis. Herein, we probe the contribution to early chondrogenesis of two key modulators of adhesion, namely focal adhesion kinase (FAK)/Src and CCN2 (connective tissue growth factor, CTGF). We use the micromass model of chondrogenesis to show that FAK/Src signaling, which mediates cell/matrix attachment, suppresses early chondrogenesis, including the induction of Ccn2, Agc, and Sox6. The FAK/Src inhibitor PP2 elevates Ccn2, Agc, and Sox6 expression in wild-type mesenchymal cells in micromass culture, but not in cells lacking CCN2. Our results suggest a reduction in FAK/Src signaling is a critical feature permitting chondrogenic differentiation and that CCN2 operates downstream of this loss to promote chondrogenesis.
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Affiliation(s)
- Daphne Pala
- Department of Physiology and Pharmacology and Division of Oral Biology, Canadian Institute of Health Research Group in Skeletal Development and Remodeling, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
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16
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Jacques C, Recklies AD, Levy A, Berenbaum F. HC-gp39 contributes to chondrocyte differentiation by inducing SOX9 and type II collagen expressions. Osteoarthritis Cartilage 2007; 15:138-46. [PMID: 16949314 DOI: 10.1016/j.joca.2006.07.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2005] [Accepted: 07/09/2006] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The transcription factor SOX9 has been shown to be linked to chondrocyte differentiation and induction of type II collagen synthesis. Since the chitinase-like protein, human cartilage glycoprotein 39 (HC-gp39), can be expressed by articular chondrocytes and has been shown to enhance chondrocyte mitogenesis through MAP kinase and PI3 kinase-mediated signalling, we hypothesized that it may also promote synthesis of cartilage matrix components through induction of SOX9, utilizing similar signalling pathways. METHODS Primary chondrocytes from neonatal mouse rib cartilage were exposed to purified HC-gp39. The response of the cells was evaluated in terms of SOX9 induction and synthesis of type II collagen. Signalling pathways activated following HC-gp9 exposure were analyzed by Western blotting of cell lysates with phosphorylation-specific antibodies as well as by using selective inhibitors. RESULTS HC-gp39 induced both SOX9 and type II collagen synthesis. Similar results were observed for IGF-1. This process required signalling through both MAP kinase and PI3 kinase pathways resulting in rapid phosphorylation of ERK1/2 and AKT, respectively. Neither HC-gp39 nor IGF-1 induced activation of SAPK/JNK. CONCLUSIONS The effects of HC-gp39 on chondrocyte function suggest that this molecule may promote the maintenance or expression of a chondrocytic phenotype. Its expression in injured or degenerate cartilage could be related to the initial repair-response and increased matrix synthesis observed in osteoarthritic cartilage.
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Affiliation(s)
- C Jacques
- UMR 7079 CNRS, Physiology and Physiopathology Laboratory, University Paris 6, 7 quai St-Bernard, Paris, 75252 Cedex 5, France
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17
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Nurminsky D, Magee C, Faverman L, Nurminskaya M. Regulation of chondrocyte differentiation by actin-severing protein adseverin. Dev Biol 2006; 302:427-37. [PMID: 17097081 PMCID: PMC3387683 DOI: 10.1016/j.ydbio.2006.09.052] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2006] [Revised: 09/25/2006] [Accepted: 09/29/2006] [Indexed: 11/28/2022]
Abstract
The importance of actin organization in controlling the chondrocyte phenotype is well established, but little is known about the cytoskeletal components regulating chondrocyte differentiation. Previously, we have observed up-regulation of an actin-binding gelsolin-like protein in hypertrophic chondrocytes. We have now identified it as adseverin (scinderin). Adseverin is drastically up-regulated during chondrocyte maturation, as shown by Northern blot analysis, in situ hybridization, and real-time RT-PCR. Its expression is positively regulated by PKC and MEK signaling as shown by inhibitory analyses. Over-expression of adseverin in non-hypertrophic chondrocytes causes rearrangement of the actin cytoskeleton, a change in cell morphology, a dramatic (3.5-fold) increase in cell volume, and up-regulation of Indian hedgehog (Ihh) and of collagen type X--all indicative of chondrocyte differentiation. These changes are mediated by ERK1/2 and p38 kinase pathways. Thus, adseverin-induced rearrangements of the actin cytoskeleton may mediate the PKC-dependent activation of p38 and Erk1/2 signaling pathways necessary for chondrocyte hypertrophy, as evidenced by changes in cell morphology, increase in cell size and expression of the chondrocyte maturation markers. These results demonstrate that interdependence of cytoskeletal organization and chondrogenic gene expression is regulated, at least in part, by actin-binding proteins such as adseverin.
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Affiliation(s)
- Dmitry Nurminsky
- Tufts University School of Medicine, Department of Anatomy and Cellular Biology, 136 Harrison Avenue Boston, MA 02111, USA
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18
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Gomes RR, Joshi SS, Farach-Carson MC, Carson DD. Ribozyme-mediated perlecan knockdown impairs chondrogenic differentiation of C3H10T1/2 fibroblasts. Differentiation 2006; 74:53-63. [PMID: 16466400 PMCID: PMC1403289 DOI: 10.1111/j.1432-0436.2005.00055.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Perlecan (Pln) is an abundant heparan sulfate (HS) proteoglycan in the pericellular matrix of developing cartilage, and its absence dramatically disrupts endochondral bone formation. This study examined two previously unexamined aspects of the function of Pln in mesenchymal chondrogenesis in vitro. Using the well-established high-density micromass model of chondrogenic differentiation, we first examined the requirement for endogenous Pln synthesis and secretion through the use of Pln-targeted ribozymes in murine C3H10T1/2 embryonic fibroblasts. Second, we examined the ability of the unique N-terminal, HS-bearing Pln domain I (PlnDI) to synergize with exogenous bone morphogenetic protein-2 (BMP-2) to support later stage chondrogenic maturation of cellular condensations. The results provide clear evidence that the function of Pln in late stage chondrogenesis requires Pln biosynthesis and secretion, because 60%-70% reductions in Pln greatly diminish chondrogenic marker expression in micromass culture. Additionally, these data support the idea that while early chondrocyte differentiation can be supported by exogenous HS-decorated PlnDI, efficient late stage PlnDI-supported chondrogenesis requires both BMP-2 and Pln biosynthesis.
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Affiliation(s)
- Ronald R Gomes
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
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19
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Bobick BE, Kulyk WM. MEK-ERK signaling plays diverse roles in the regulation of facial chondrogenesis. Exp Cell Res 2006; 312:1079-92. [PMID: 16457813 DOI: 10.1016/j.yexcr.2005.12.028] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2005] [Revised: 12/10/2005] [Accepted: 12/20/2005] [Indexed: 01/14/2023]
Abstract
The extracellular signal-regulated kinase (ERK) mitogen-activated protein kinase pathway, also known as the MEK-ERK cascade, has been shown to regulate cartilage differentiation in embryonic limb mesoderm and several chondrogenic cell lines. In the present study, we employed the micromass culture system to define the roles of MEK-ERK signaling in the chondrogenic differentiation of neural crest-derived ectomesenchyme cells of the embryonic chick facial primordia. In cultures of frontonasal mesenchyme isolated from stage 24/25 embryos, treatment with the MEK inhibitor U0126 increased type II collagen and glycosaminoglycan deposition into cartilage matrix, elevated mRNA levels for three chondrogenic marker genes (col2a1, aggrecan, and sox9), and increased expression of a Sox9-responsive collagen II enhancer-luciferase reporter gene. Transfection of frontonasal mesenchyme cells with dominant negative ERK increased collagen II enhancer activation, whereas transfection of constitutively active MEK decreased its activity. Thus, MEK-ERK signaling inhibits chondrogenesis in stage 24/25 frontonasal mesenchyme. Conversely, MEK-ERK signaling enhanced chondrogenic differentiation in mesenchyme of the stage 24/25 mandibular arch. In mandibular mesenchyme cultures, pharmacological MEK inhibition decreased cartilage matrix deposition, cartilage-specific RNA levels, and collagen II enhancer activity. Expression of constitutively active MEK increased collagen II enhancer activation in mandibular mesenchyme, while dominant negative ERK had the opposite effect. Interestingly, MEK-ERK modulation had no significant effects on cultures of maxillary or hyoid process mesenchyme cells. Moreover, we observed a striking shift in the response of frontonasal mesenchyme to MEK-ERK modulation by stage 28/29 of development.
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Affiliation(s)
- Brent E Bobick
- Department of Anatomy and Cell Biology, College of Medicine, University of Saskatchewan, 107 Wiggins Road, Saskatoon, Saskatchewan, Canada S7N 5E5
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20
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Ijiri K, Zerbini LF, Peng H, Correa RG, Lu B, Walsh N, Zhao Y, Taniguchi N, Huang XL, Otu H, Wang H, Wang JF, Komiya S, Ducy P, Rahman MU, Flavell RA, Gravallese EM, Oettgen P, Libermann TA, Goldring MB. A novel role for GADD45beta as a mediator of MMP-13 gene expression during chondrocyte terminal differentiation. J Biol Chem 2005; 280:38544-55. [PMID: 16144844 PMCID: PMC3937966 DOI: 10.1074/jbc.m504202200] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The growth arrest and DNA damage-inducible 45beta (GADD45beta) gene product has been implicated in the stress response, cell cycle arrest, and apoptosis. Here we demonstrated the unexpected expression of GADD45beta in the embryonic growth plate and uncovered its novel role as an essential mediator of matrix metalloproteinase-13 (MMP-13) expression during terminal chondrocyte differentiation. We identified GADD45beta as a prominent early response gene induced by bone morphogenetic protein-2 (BMP-2) through a Smad1/Runx2-dependent pathway. Because this pathway is involved in skeletal development, we examined mouse embryonic growth plates, and we observed expression of Gadd45beta mRNA coincident with Runx2 protein in pre-hypertrophic chondrocytes, whereas GADD45beta protein was localized prominently in the nucleus in late stage hypertrophic chondrocytes where Mmp-13 mRNA was expressed. In Gadd45beta(-/-) mouse embryos, defective mineralization and decreased bone growth accompanied deficient Mmp-13 and Col10a1 gene expression in the hypertrophic zone. Transduction of small interfering RNA-GADD45beta in epiphyseal chondrocytes in vitro blocked terminal differentiation and the associated expression of Mmp-13 and Col10a1 mRNA in vitro. Finally, GADD45beta stimulated MMP-13 promoter activity in chondrocytes through the JNK-mediated phosphorylation of JunD, partnered with Fra2, in synergy with Runx2. These observations indicated that GADD45beta plays an essential role during chondrocyte terminal differentiation.
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Affiliation(s)
- Kosei Ijiri
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Luiz F. Zerbini
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Haibing Peng
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Ricardo G. Correa
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California 92037
| | - Binfeng Lu
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261
| | - Nicole Walsh
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Yani Zhao
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261
| | - Noboru Taniguchi
- Department of Neuro-Musculoskeletal Disorders, Orthopaedic Surgery, Graduate School of Medicine and Dentistry, Kagoshima University, Kagoshima 890-8520, Japan
| | - Xu-Ling Huang
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Hasan Otu
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Hong Wang
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Jian Fei Wang
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Setsuro Komiya
- Department of Neuro-Musculoskeletal Disorders, Orthopaedic Surgery, Graduate School of Medicine and Dentistry, Kagoshima University, Kagoshima 890-8520, Japan
| | - Patricia Ducy
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030
| | - Mahboob U. Rahman
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114
| | - Richard A. Flavell
- Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut 06520-8011
| | - Ellen M. Gravallese
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Peter Oettgen
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Towia A. Libermann
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
| | - Mary B. Goldring
- Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Beth Israel Deaconess Medical Center Genomics Center, and Harvard Medical School, Boston, Massachusetts 02115
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Yagi R, McBurney D, Horton WE. Bcl-2 positively regulates Sox9-dependent chondrocyte gene expression by suppressing the MEK-ERK1/2 signaling pathway. J Biol Chem 2005; 280:30517-25. [PMID: 15975921 DOI: 10.1074/jbc.m502751200] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Bcl-2 is an anti-apoptotic protein that has recently been shown to regulate other cellular functions. We previously reported that Bcl-2 regulates chondrocyte matrix gene expression, independent of its anti-apoptotic function. Here, we further investigate this novel function of Bcl-2 and examine three intracellular signaling pathways likely to be associated with this function. The present study demonstrates that the activity of Sox9, a master transcription factor that regulates the gene expression of chondrocyte matrix proteins, is suppressed by Bcl-2 small interference RNA in the presence of caspase inhibitors. This effect was attenuated by prior exposure of chondrocytes to an adenoviral vector expressing sense Bcl-2. In addition, the down-regulation of Bcl-2, Sox9, and chondrocyte-specific gene expression by serum withdrawal in primary chondrocytes was reversed by expressing Bcl-2. Inhibition of the protein kinase C alpha and NFkappaB pathways had no effect on the maintenance of Sox9-dependent gene expression by Bcl-2. In contrast, whereas the MEK-ERK1/2 pathway negatively regulated the differentiated phenotype in wild type chondrocytes, inhibition of this pathway reversed the loss of differentiation markers and fibroblastic phenotype in Bcl-2-deficient chondrocytes. In conclusion, the present study identifies a specific signaling pathway, namely, MEK-ERK1/2, that is downstream of Bcl-2 in the regulation of Sox9-dependent chondrocyte gene expression and phenotype.
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Affiliation(s)
- Rieko Yagi
- Department of Anatomy, Northeastern Ohio Universities College of Medicine, Rootstown, Ohio 44272, USA
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22
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Solchaga LA, Penick K, Porter JD, Goldberg VM, Caplan AI, Welter JF. FGF-2 enhances the mitotic and chondrogenic potentials of human adult bone marrow-derived mesenchymal stem cells. J Cell Physiol 2005; 203:398-409. [PMID: 15521064 DOI: 10.1002/jcp.20238] [Citation(s) in RCA: 355] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Human mesenchymal stem cells (hMSCs) expanded with and without fibroblast growth factor (FGF) supplementation were compared with respect to their proliferation rate, ability to differentiate along the chondrogenic pathway in vitro, and their gene expression profiles. hMSCs expanded in FGF-supplemented medium were smaller and proliferated more rapidly than hMSCs expanded in control conditions. Chondrogenic cultures made with FGF-treated cells were larger and contain more proteoglycan than those made with control cells. Furthermore, aggregates of FGF-treated cells lacked the collagen type I-positive and collagen type II-negative outer layer characteristic of aggregates of control cells. A total of 358 unique transcripts were differentially expressed in FGF-treated hMSCs. Of these, 150 were upregulated and 208 downregulated. Seventeen percent of these genes affect proliferation. Known genes associated with cellular signaling functions comprised the largest percentage ( approximately 20%) of differentially expressed transcripts. Eighty percent of differentially expressed extracellular matrix-related genes were downregulated. The present findings that FGF-2 enhances proliferation and differentiation of hMSCs adds to a growing body of evidence that cytokines modulate the differentiation potential and, perhaps, the multipotentiality of adult stem cells. With the generation of gene expression profiles of FGF-treated and control cells we have taken the first steps in the elucidation of the molecular mechanism(s) behind these phenomena.
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Affiliation(s)
- Luis A Solchaga
- Department of Orthopaedics, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA.
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23
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Elder SH, Fulzele KS, McCulley WR. Cyclic hydrostatic compression stimulates chondroinduction of C3H/10T1/2 cells. Biomech Model Mechanobiol 2005; 3:141-6. [PMID: 15668766 DOI: 10.1007/s10237-004-0058-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2004] [Accepted: 11/01/2004] [Indexed: 11/30/2022]
Abstract
While the potential for intermittent hydrostatic pressure to promote cartilaginous matrix synthesis is well established, its potential to influence chondroinduction remains poorly understood. This study examined the effects of relatively short- and long-duration cyclic hydrostatic compression on the chondroinduction of C3H/10T1/2 murine embryonic fibroblasts by recombinant human bone morphogenetic protein-2 (rhBMP-2). Cells were seeded at high density into round bottom wells of a 96-well plate and supplemented with 25 ng/ml rhBMP-2. Experimental cultures were subjected to either 1,800 cycles/day or 7,200 cycles/day of 1 Hz sinusoidal hydrostatic compression to 5 MPa (applied 10 min on/10 min off) for 3 days. Non-pressurized control and experimental cultures were maintained in static culture for an additional 5 days. Cultures were then analyzed for alcian blue staining intensity, DNA and sulfated glycosaminoglycan (sGAG) content, and for the rate of collagen synthesis. Whereas cultures subjected to 1,800 pressure cycles exhibited no significant differences (statistical or qualitative) compared to controls, those subjected to 7,200 cycles stained more intensely with alcian blue, contained nearly twice as much sGAG, and displayed twice the rate of collagen synthesis as non-pressurized controls. This study demonstrates the potential for cyclic hydrostatic compression to stimulate chondrogenic differentiation of the C3H/10T1/2 cell line in a duration-dependent manner.
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Affiliation(s)
- S H Elder
- Graduate Biomedical Engineering Program, Agricultural & Biological Engineering Department, Mississippi State University, Starkville, MS 39762, USA.
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Abstract
Chondrogenesis is the earliest phase of skeletal development, involving mesenchymal cell recruitment and migration, condensation of progenitors, and chondrocyte differentiation, and maturation and resulting in the formation of cartilage and bone during endochondral ossification. This process is controlled exquisitely by cellular interactions with the surrounding matrix, growth and differentiation factors, and other environmental factors that initiate or suppress cellular signaling pathways and transcription of specific genes in a temporal-spatial manner. Vertebrate limb development is controlled by interacting patterning systems involving prominently the fibroblast growth factor (FGF), bone morphogenetic protein (BMP), and hedgehog pathways. Both positive and negative signaling kinases and transcription factors, such as Sox9 and Runx2, and interactions among them determine whether the differentiated chondrocytes remain within cartilage elements in articular joints or undergo hypertrophic maturation prior to ossification. The latter process requires extracellular matrix remodeling and vascularization controlled by mechanisms that are not understood completely. Recent work has revealed novel roles for mediators such as GADD45beta, transcription factors of the Dlx, bHLH, leucine zipper, and AP-1 families, and the Wnt/beta-catenin pathway that interact at different stages during chondrogenesis.
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Affiliation(s)
- Mary B Goldring
- Department of Medicine, Division of Rheumatology, Beth Israel Deaconess Medical Center, New England Baptist Bone and Joint Institute and Harvard Medical School, Boston, MA 02115, USA.
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Bobick BE, Kulyk WM. The MEK-ERK Signaling Pathway Is a Negative Regulator of Cartilage-specific Gene Expression in Embryonic Limb Mesenchyme. J Biol Chem 2004; 279:4588-95. [PMID: 14617631 DOI: 10.1074/jbc.m309805200] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The extracellular signal-regulated kinase (ERK) mitogen-activated protein kinase pathway, also known as the MEK-ERK kinase cascade, has recently been implicated in the regulation of embryonic cartilage differentiation. However, its precise role in this complex process remains controversial. To more thoroughly examine the role of the MEK-ERK kinase cascade in chondrogenesis, we analyzed the effects of two structurally different pharmacological inhibitors of MEK, the upstream kinase activator of ERK, on chondrocyte differentiation in micromass cultures of embryonic chick limb mesenchyme cells. We found that the MEK inhibitors, U0126 and PD98059, promote increased accumulation of cartilage-characteristic mRNA transcripts for type II collagen, aggrecan, and the transcription factor, Sox9. PD98059 treatment stimulated increased deposition of sulfated glycosaminoglycan into both Alcian blue-stainable cartilage matrix and the surrounding culture medium, whereas U0126 elevated glycosaminoglycan secretion into the medium fraction alone. Both MEK inhibitors increased total type II collagen protein accumulation in micromass culture and elevated the activity of a transfected type II collagen enhancer-luciferase reporter gene. Thus, pharmacological MEK inhibition induced increased expression of multiple chondrocyte differentiation markers. Conversely, transfection of limb mesenchyme cells with a constitutively active MEK1 plasmid resulted in a prominent decrease in the activity of a co-transfected type II collagen enhancer-luciferase reporter gene. Collectively, these findings support the hypothesis that signaling through the MEK-ERK kinase cascade may function as an important inhibitory regulator of embryonic cartilage differentiation.
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Affiliation(s)
- Brent E Bobick
- Department of Anatomy and Cell Biology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada
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