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Shen J, Nair A, Saxena R, Zhang CC, Borrelli J, Tang L. Tissue engineering bone using autologous progenitor cells in the peritoneum. PLoS One 2014; 9:e93514. [PMID: 24681529 PMCID: PMC3969359 DOI: 10.1371/journal.pone.0093514] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Accepted: 03/06/2014] [Indexed: 01/01/2023] Open
Abstract
Despite intensive research efforts, there remains a need for novel methods to improve the ossification of scaffolds for bone tissue engineering. Based on a common phenomenon and known pathological conditions of peritoneal membrane ossification following peritoneal dialysis, we have explored the possibility of regenerating ossified tissue in the peritoneum. Interestingly, in addition to inflammatory cells, we discovered a large number of multipotent mesenchymal stem cells (MSCs) in the peritoneal lavage fluid from mice with peritoneal catheter implants. The osteogenic potential of these peritoneal progenitor cells was demonstrated by their ability to easily infiltrate decalcified bone implants, produce osteocalcin and form mineralized bone in 8 weeks. Additionally, when poly(l-lactic acid) scaffolds loaded with bone morphogenetic protein-2 (a known osteogenic differentiation agent) were implanted into the peritoneum, signs of osteogenesis were seen within 8 weeks of implantation. The results of this investigation support the concept that scaffolds containing BMP-2 can stimulate the formation of bone in the peritoneum via directed autologous stem and progenitor cell responses.
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Affiliation(s)
- Jinhui Shen
- Department of Bioengineering, University of Texas at Arlington, Arlington, Texas, United States of America
| | - Ashwin Nair
- Department of Bioengineering, University of Texas at Arlington, Arlington, Texas, United States of America
| | - Ramesh Saxena
- Division of Nephrology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
| | - Cheng Cheng Zhang
- Departments of Physiology and Developmental Biology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, United States of America
| | - Joseph Borrelli
- Texas Health Physicians Group, Texas Health Arlington Memorial Hospital, Arlington, Texas, United States of America
| | - Liping Tang
- Department of Bioengineering, University of Texas at Arlington, Arlington, Texas, United States of America
- Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan
- * E-mail:
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Odorisio T, Di Salvio M, Orecchia A, Di Zenzo G, Piccinni E, Cianfarani F, Travaglione A, Uva P, Bellei B, Conti A, Zambruno G, Castiglia D. Monozygotic twins discordant for recessive dystrophic epidermolysis bullosa phenotype highlight the role of TGF-β signalling in modifying disease severity. Hum Mol Genet 2014; 23:3907-22. [DOI: 10.1093/hmg/ddu102] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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53
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Bayo J, Marrodán M, Aquino JB, Silva M, García MG, Mazzolini G. The therapeutic potential of bone marrow-derived mesenchymal stromal cells on hepatocellular carcinoma. Liver Int 2014; 34:330-42. [PMID: 24112437 DOI: 10.1111/liv.12338] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 09/15/2013] [Indexed: 12/11/2022]
Abstract
Mesenchymal stromal cells (MSCs) are more often obtained from adult and extraembryonic tissues, with the latter sources being likely better from a therapeutic perspective. MSCs show tropism towards inflamed or tumourigenic sites. Mechanisms involved in MSC recruitment into tumours are comprehensively analysed, including chemoattractant signalling axes, endothelial adhesion and transmigration. In addition, signals derived from hepatocellular carcinoma (HCC) tumour microenvironment and their influence in MSC tropism and tumour recruitment are dissected, as well as the present controversy regarding their influence on tumour growth and/or metastasis. Finally, evidences available on the use of MSCs and other selected progenitor/stem cells as vehicles of antitumourigenic genes are discussed. A better knowledge of the mechanisms involved in progenitor/stem cell recruitment to HCC tumours is proposed in order to enhance their tumour targeting which may result in improvements in cell-based gene therapy strategies.
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Affiliation(s)
- Juan Bayo
- Gene Therapy Laboratory, Facultad de Ciencias Biomédicas, Universidad Austral, Derqui-Pilar, Argentina
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54
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Cell type and transfection reagent-dependent effects on viability, cell content, cell cycle and inflammation of RNAi in human primary mesenchymal cells. Eur J Pharm Sci 2014; 53:35-44. [DOI: 10.1016/j.ejps.2013.12.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 11/09/2013] [Accepted: 12/08/2013] [Indexed: 12/22/2022]
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55
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Chung KM, Hsu SC, Chu YR, Lin MY, Jiaang WT, Chen RH, Chen X. Fibroblast activation protein (FAP) is essential for the migration of bone marrow mesenchymal stem cells through RhoA activation. PLoS One 2014; 9:e88772. [PMID: 24551161 PMCID: PMC3923824 DOI: 10.1371/journal.pone.0088772] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 01/15/2014] [Indexed: 01/08/2023] Open
Abstract
Background The ability of human bone marrow mesenchymal stem cells (BM-MSCs) to migrate and localize specifically to injured tissues is central in developing therapeutic strategies for tissue repair and regeneration. Fibroblast activation protein (FAP) is a cell surface serine protease expressed at sites of tissue remodeling during embryonic development. It is also expressed in BM-MSCs, but not in normal tissues or cells. The function of FAP in BM-MSCs is not known. Principal Findings We found that depletion of FAP proteins significantly inhibited the migration of BM-MSCs in a transwell chemotaxis assay. Such impaired migration ability of BM-MSCs could be rescued by re-expressing FAP in these cells. We then demonstrated that depletion of FAP activated intracellular RhoA GTPase. Consistently, inhibition of RhoA activity using a RhoA inhibitor rescued its migration ability. Inhibition of FAP activity with an FAP-specific inhibitor did not affect the activation of RhoA or the migration of BM-MSCs. Furthermore, the inflammatory cytokines interleukin-1beta (IL-1β) and transforming growth factor-beta (TGF-β) upregulated FAP expression, which coincided with better BM-MSC migration. Conclusions Our results indicate FAP plays an important role in the migration of BM-MSCs through modulation of RhoA GTPase activity. The peptidase activity of FAP is not essential for such migration. Cytokines IL-1β and TGF-β upregulate the expression level of FAP and thus enhance BM-MSC migration.
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Affiliation(s)
- Kuei-Min Chung
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli, Taiwan, Republic of China
- * E-mail: (K-MC); (XC)
| | - Shu-Ching Hsu
- Vaccine Research and Development Center, National Health Research Institutes, Miaoli, Taiwan, Republic of China
| | - Yue-Ru Chu
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli, Taiwan, Republic of China
| | - Mei-Yao Lin
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan, Republic of China
| | - Weir-Tong Jiaang
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli, Taiwan, Republic of China
| | - Ruey-Hwa Chen
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan, Republic of China
| | - Xin Chen
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli, Taiwan, Republic of China
- Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan, Republic of China
- * E-mail: (K-MC); (XC)
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56
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Ren J, Wang Q, Morgan S, Si Y, Ravichander A, Dou C, Kent KC, Liu B. Protein kinase C-δ (PKCδ) regulates proinflammatory chemokine expression through cytosolic interaction with the NF-κB subunit p65 in vascular smooth muscle cells. J Biol Chem 2014; 289:9013-26. [PMID: 24519937 DOI: 10.1074/jbc.m113.515957] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Proinflammatory chemokines released by vascular smooth muscle cells (VSMCs) play a critical role in vascular inflammation. Protein kinase C-δ (PKCδ) has been shown to be up-regulated in VSMCs of injured arteries. PKCδ knock-out (Prkcd(-/-)) mice are resistant to inflammation as well as apoptosis in models of abdominal aortic aneurysm. However, the precise mechanism by which PKCδ modulates inflammation remains incompletely understood. In this study, we identified four inflammatory chemokines (Ccl2/Mcp-1, Ccl7, Cxcl16, and Cx3cl1) of over 45 PKCδ-regulated genes associated with inflammatory response by microarray analysis. Using CCL2 as a prototype, we demonstrated that PKCδ stimulated chemokine expression at the transcriptional level. Inhibition of the NF-κB pathway or siRNA knockdown of subunit p65, but not p50, eliminated the effect of PKCδ on Ccl2 expression. Overexpressing PKCδ followed by incubation with phorbol 12-myristate 13-acetate resulted in an increase in p65 Ser-536 phosphorylation and enhanced DNA binding affinity without affecting IκB degradation or p65 nuclear translocation. Prkcd gene deficiency impaired p65 Ser-536 phosphorylation and DNA binding affinity in response to TNFα. Results from in situ proximity ligation analysis and co-immunoprecipitation performed on cultured VSMCs and aneurysmal aorta demonstrated physical interaction between PKCδ and p65 that took place largely outside the nucleus. Promoting nuclear translocation of PKCδ with peptide ψδRACK diminished Ccl2 production, whereas inhibition of PKCδ translocation with peptide δV1-1 enhanced Ccl2 expression. Together, these results suggest that PKCδ modulates inflammation at least in part through the NF-κB-mediated chemokines. Mechanistically, PKCδ activates NF-κB through an IκB-independent cytosolic interaction, which subsequently leads to enhanced p65 phosphorylation and DNA binding affinity.
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Affiliation(s)
- Jun Ren
- From the Division of Vascular Surgery, Department of Surgery, University of Wisconsin, Madison, Wisconsin 53705 and
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57
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Kim DS, Lee MW, Yoo KH, Lee TH, Kim HJ, Jang IK, Chun YH, Kim HJ, Park SJ, Lee SH, Son MH, Jung HL, Sung KW, Koo HH. Gene expression profiles of human adipose tissue-derived mesenchymal stem cells are modified by cell culture density. PLoS One 2014; 9:e83363. [PMID: 24400072 PMCID: PMC3882209 DOI: 10.1371/journal.pone.0083363] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Accepted: 11/01/2013] [Indexed: 11/18/2022] Open
Abstract
Previous studies conducted cell expansion ex vivo using low initial plating densities for optimal expansion and subsequent differentiation of mesenchymal stem cells (MSCs). However, MSC populations are heterogeneous and culture conditions can affect the characteristics of MSCs. In this study, differences in gene expression profiles of adipose tissue (AT)-derived MSCs were examined after harvesting cells cultured at different densities. AT-MSCs from three different donors were plated at a density of 200 or 5,000 cells/cm2. After 7 days in culture, detailed gene expression profiles were investigated using a DNA chip microarray, and subsequently validated using a reverse transcription polymerase chain reaction (RT-PCR) analysis. Gene expression profiles were influenced primarily by the level of cell confluence at harvest. In MSCs harvested at ∼90% confluence, 177 genes were up-regulated and 102 genes down-regulated relative to cells harvested at ∼50% confluence (P<0.05, FC>2). Proliferation-related genes were highly expressed in MSCs harvested at low density, while genes that were highly expressed in MSCs harvested at high density (∼90% confluent) were linked to immunity and defense, cell communication, signal transduction and cell motility. Several cytokine, chemokine and growth factor genes involved in immunosuppression, migration, and reconstitution of damaged tissues were up-regulated in MSCs harvested at high density compared with MSCs harvested at low density. These results imply that cell density at harvest is a critical factor for modulating the specific gene-expression patterns of heterogeneous MSCs.
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Affiliation(s)
- Dae Seong Kim
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Myoung Woo Lee
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Keon Hee Yoo
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
- * E-mail: (KHY); (HHK)
| | - Tae-Hee Lee
- Department of Laboratory of Cancer and Stem Cell Biology, Plant Engineering Institute, Sejong University, Seoul, Korea
| | - Hye Jin Kim
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - In Keun Jang
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | | | | | - Seung Jo Park
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Soo Hyun Lee
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Meong Hi Son
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Hye Lim Jung
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Ki Woong Sung
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Hong Hoe Koo
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
- * E-mail: (KHY); (HHK)
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58
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Marsell R, Steen B, Bais MV, Mortlock DP, Einhorn TA, Gerstenfeld LC. Skeletal trauma generates systemic BMP2 activation that is temporally related to the mobilization of CD73+ cells. J Orthop Res 2014; 32:17-23. [PMID: 24018651 PMCID: PMC4263190 DOI: 10.1002/jor.22487] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 08/21/2013] [Accepted: 08/21/2013] [Indexed: 02/04/2023]
Abstract
The relationship between BMP2 expression and the recruitment of skeletogenic stem cells was assessed following bone marrow reaming. BMP2 expression was examined using transgenic mice in which β-galactosidase had been inserted into the coding region of BMP2. Stem cell mobilization was analyzed by FACS analysis using CD73, a marker associated with bone marrow stromal stem cells. BMP2 expression was induced in endosteal lining cells, cortical osteocytes and periosteal cells in both the reamed and in contralateral bones. BMP2 mRNA expression in the reamed bone showed an early peak within the first 24 h of reaming followed by a later peak at 7 days, while contralateral bones only showed the 7 days peak of expression. FACS analysis sorting on CD73 positive cells showed a 50% increase of these cells at 3 and 14 days in the marrow of the injured bone and a single peak at 14 days of the marrow cell population of the contralateral bone. A ∼20% increase of CD73 positive cells was seen in the peripheral blood 2 days after reaming. These data showed that traumatic bone injury caused a systemic induction of BMP2 expression and that this increase is correlated with the mobilization of CD73 positive cells.
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Affiliation(s)
- Richard Marsell
- Department of Orthopaedic Surgery, Boston University Medical Center715 Albany Street, R-205, Boston, 02118, Massachusetts
| | - Brandon Steen
- Department of Orthopaedic Surgery, Boston University Medical Center715 Albany Street, R-205, Boston, 02118, Massachusetts
| | - Manish V Bais
- Department of Orthopaedic Surgery, Boston University Medical Center715 Albany Street, R-205, Boston, 02118, Massachusetts
| | - Douglas P Mortlock
- Department of Molecular Physiology and Biophysics Center for Human Genetics Research, Vanderbilt University School of MedicineNashville, Tennessee
| | - Thomas A Einhorn
- Department of Orthopaedic Surgery, Boston University Medical Center715 Albany Street, R-205, Boston, 02118, Massachusetts
| | - Louis C Gerstenfeld
- Department of Orthopaedic Surgery, Boston University Medical Center715 Albany Street, R-205, Boston, 02118, Massachusetts
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59
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Wu Z, Kong X, Zhang T, Ye J, Fang Z, Yang X. Pseudoephedrine/ephedrine shows potent anti-inflammatory activity against TNF-α-mediated acute liver failure induced by lipopolysaccharide/D-galactosamine. Eur J Pharmacol 2013; 724:112-21. [PMID: 24365491 DOI: 10.1016/j.ejphar.2013.11.032] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 11/19/2013] [Accepted: 11/23/2013] [Indexed: 02/05/2023]
Abstract
The anti-inflammatory effects of pseudoephedrine/ephedrine were investigated using the experimental model of lipopolysaccharide (LPS)-induced acute liver failure in D-galactosamine (D-GalN)-sensitised male rats in order to elucidate effects other than sympathomimetic effects. Rats were intraperitoneally injected with D-GalN (400 mg/kg) and LPS (40 μg/kg) to induce acute liver failure. The treatment groups were then intraperitoneally administered pseudoephedrine/ephedrine at 0 h and 4 h after induction and the activation induced by treatment with pseudoephedrine and/or LPS on the primary Kupffer cells (KCs) was monitored. Compared with controls induced by GalN/LPS alone, pseudoephedrine dramatically reduced the infiltration of inflammatory cells and bile ductular hyperplasia and hepatic necrosis observed in liver sections. It inhibited both hepatocellular apoptosis and the expression of monocyte chemotactic protein-1. It lowered the production of tumour necrosis factor-α (TNF-α) in the beginning of acute liver failure induced by D-GalN/LPS. Correspondingly, levels of alanine aminotransferase (ALT), total bilirubin (TBIL) and malondialdehyde were attenuated. Ephedrine demonstrated all these identical protective effects as well. In addition, pseudoephedrine significantly suppressed the production of p-IκB-α, reducing the degradation of sequestered nuclear factor kappa B (NF-κB) in the cytoplasm, and inhibited the translocation of NF-κB/p65 to the nucleus, the transcription of TNF-α mRNA and the production of TNF-α in primary KCs. These results suggest that pseudoephedrine and ephedrine have a potent anti-inflammatory activity against D-GalN/LPS-induced acute liver failure in rats, and this comprehensive anti-inflammatory effect may result from the inhibition of TNF-α production.
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Affiliation(s)
- Zhongping Wu
- Teaching & Research Department of Clinical and Classic Medicine, College of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, 1200 Cai lun Road, Shanghai 201203, China.
| | - Xiangliang Kong
- Teaching & Research Department of Clinical and Classic Medicine, College of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, 1200 Cai lun Road, Shanghai 201203, China
| | - Tong Zhang
- Teaching & Research Department of Clinical and Classic Medicine, College of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, 1200 Cai lun Road, Shanghai 201203, China
| | - Jin Ye
- Teaching & Research Department of Clinical and Classic Medicine, College of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, 1200 Cai lun Road, Shanghai 201203, China
| | - Zhaoqin Fang
- Teaching & Research Department of Clinical and Classic Medicine, College of Basic Medical Science, Shanghai University of Traditional Chinese Medicine, 1200 Cai lun Road, Shanghai 201203, China
| | - Xuejun Yang
- Department of Nephrology, Shuguang Hospital Affiliated with Shanghai University of Traditional Chinese Medicine, 528 Zhangheng Road, Shanghai 201203, China.
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60
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Huang C, Day ML, Poronnik P, Pollock CA, Chen XM. Inhibition of KCa3.1 suppresses TGF-β1 induced MCP-1 expression in human proximal tubular cells through Smad3, p38 and ERK1/2 signaling pathways. Int J Biochem Cell Biol 2013; 47:1-10. [PMID: 24291552 DOI: 10.1016/j.biocel.2013.11.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 11/13/2013] [Accepted: 11/18/2013] [Indexed: 11/18/2022]
Abstract
It is well known that TGF-β1 plays a central role in renal fibrosis due in large part to stimulation of inflammatory responses. KCa3.1, a potassium channel protein, has been suggested as a potential therapeutic target for diseases such as sickle cell anemia, autoimmunity, atherosclerosis and more recently, kidney fibrosis. Blockade of KCa3.1 has been shown to ameliorate renal fibrosis in diabetic mice in association with reduced TGF-β1 signaling. However, the centrality of KCa3.1 activation to TGF-β1 induced inflammation remains unknown. In this study, human proximal tubular cells (HK2 cells) were incubated with TGF-β1 (2 ng/ml) for 48 h in the presence or absence of KCa3.1 siRNA or the KCa3.1 inhibitor TRAM34. HK2 cells overexpressing KCa3.1 were studied in parallel. The mRNA and protein expression of monocyte chemoattractant protein-1 (MCP-1) were measured by qRT-PCR and ELISA. Downstream TGF-β1 signaling molecules Smad3, p38 and ERK1/2 were measured by Western blot analysis. Using whole-cell patch clamp techniques we found that TGFβ-1 induced a large KCa3.1 K-current that was inhibited by TRAM34. TGF-β1 also increased MCP-1 mRNA and protein expression in HK2 cells compared to control, an effect that was reversed by in the presence of KCa3.1 siRNA. Similarly, TRAM34 significantly reduced the TGF-β1-mediated increase in MCP-1 at both the mRNA and protein levels. Inhibition of KCa3.1 with KCa3.1 siRNA or TRAM34 also reduced TGF-β1-induced phosphorylation of Smad3, p38 and ERK1/2 MAPK pathways. Conversely overexpression of KCa3.1 induced TGF-β1 signaling cascades and expression of MCP-1. The present study is consistent with a key role for KCa3.1 renal proximal tubular cells in mediating the TGF-β1 induction of MCP-1 expression in HK2 cells via Smad3, p38 and ERK1/2 MAPK signaling pathways.
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Affiliation(s)
- Chunling Huang
- Kolling Institute of Medical Research, Sydney Medical School, University of Sydney, Royal North Shore Hospital, St Leonards, NSW 2065, Australia; Xiamen Center of Clinical Laboratory, Xiamen Zhongshan Hospital, Medical College of Xiamen University, Xiamen 361004, China
| | - Margot L Day
- School of Medical Sciences, Discipline of Physiology and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - Philip Poronnik
- School of Medical Sciences, Discipline of Physiology and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - Carol A Pollock
- Kolling Institute of Medical Research, Sydney Medical School, University of Sydney, Royal North Shore Hospital, St Leonards, NSW 2065, Australia.
| | - Xin-Ming Chen
- Kolling Institute of Medical Research, Sydney Medical School, University of Sydney, Royal North Shore Hospital, St Leonards, NSW 2065, Australia
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61
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Lan TH, Huang XQ, Tan HM. Vascular fibrosis in atherosclerosis. Cardiovasc Pathol 2013; 22:401-7. [DOI: 10.1016/j.carpath.2013.01.003] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 12/10/2012] [Accepted: 01/08/2013] [Indexed: 01/10/2023] Open
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62
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Wan M, Li C, Zhen G, Jiao K, He W, Jia X, Wang W, Shi C, Xing Q, Chen YF, Jan De Beur S, Yu B, Cao X. Injury-activated transforming growth factor β controls mobilization of mesenchymal stem cells for tissue remodeling. Stem Cells 2013; 30:2498-511. [PMID: 22911900 DOI: 10.1002/stem.1208] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Upon secretion, transforming growth factor β (TGFβ) is maintained in a sequestered state in extracellular matrix as a latent form. The latent TGFβ is considered as a molecular sensor that releases active TGFβ in response to the perturbations of the extracellular matrix at the situations of mechanical stress, wound repair, tissue injury, and inflammation. The biological implication of the temporal discontinuity of TGFβ storage in the matrix and its activation is obscure. Here, using several animal models in which latent TGFβ is activated in vascular matrix in response to injury of arteries, we show that active TGFβ controls the mobilization and recruitment of mesenchymal stem cells (MSCs) to participate in tissue repair and remodeling. MSCs were mobilized into the peripheral blood in response to vascular injury and recruited to the injured sites where they gave rise to both endothelial cells for re-endothelialization and myofibroblastic cells to form thick neointima. TGFβs were activated in the vascular matrix in both rat and mouse models of mechanical injury of arteries. Importantly, the active TGFβ released from the injured vessels is essential to induce the migration of MSCs, and cascade expression of monocyte chemotactic protein-1 stimulated by TGFβ amplifies the signal for migration. Moreover, sustained high levels of active TGFβ were observed in peripheral blood, and at the same time points following injury, Sca1+ CD29+ CD11b- CD45- MSCs, in which 91% are nestin+ cells, were mobilized to peripheral blood and recruited to the remodeling arteries. Intravenously injection of recombinant active TGFβ1 in uninjured mice rapidly mobilized MSCs into circulation. Furthermore, inhibitor of TGFβ type I receptor blocked the mobilization and recruitment of MSCs to the injured arteries. Thus, TGFβ is an injury-activated messenger essential for the mobilization and recruitment of MSCs to participate in tissue repair/remodeling.
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Affiliation(s)
- Mei Wan
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
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Shinojima N, Hossain A, Takezaki T, Fueyo J, Gumin J, Gao F, Nwajei F, Marini FC, Andreeff M, Kuratsu JI, Lang FF. TGF-β mediates homing of bone marrow-derived human mesenchymal stem cells to glioma stem cells. Cancer Res 2013; 73:2333-44. [PMID: 23365134 DOI: 10.1158/0008-5472.can-12-3086] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Although studies have suggested that bone marrow human mesenchymal stem cells (BM-hMSC) may be used as delivery vehicles for cancer therapy, it remains unclear whether BM-hMSCs are capable of targeting cancer stem cells, including glioma stem cells (GSC), which are the tumor-initiating cells responsible for treatment failures. Using standard glioma models, we identify TGF-β as a tumor factor that attracts BM-hMSCs via TGF-β receptors (TGFβR) on BM-hMSCs. Using human and rat GSCs, we then show for the first time that intravascularly administered BM-hMSCs home to GSC-xenografts that express TGF-β. In therapeutic studies, we show that BM-hMSCs carrying the oncolytic adenovirus Delta-24-RGD prolonged the survival of TGF-β-secreting GSC xenografts and that the efficacy of this strategy can be abrogated by inhibition of TGFβR on BM-hMSCs. These findings reveal the TGF-β/TGFβR axis as a mediator of the tropism of BM-hMSCs for GSCs and suggest that TGF-β predicts patients in whom BM-hMSC delivery will be effective.
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Affiliation(s)
- Naoki Shinojima
- Department of Neurosurgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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Abstract
TGF-β (transforming growth factor-β) and BMP-7 (bone morphogenetic protein-7), two key members in the TGF-β superfamily, play important but diverse roles in CKDs (chronic kidney diseases). Both TGF-β and BMP-7 share similar downstream Smad signalling pathways, but counter-regulate each other to maintain the balance of their biological activities. During renal injury in CKDs, this balance is significantly altered because TGF-β signalling is up-regulated by inducing TGF-β1 and activating Smad3, whereas BMP-7 and its downstream Smad1/5/8 are down-regulated. In the context of renal fibrosis, Smad3 is pathogenic, whereas Smad2 and Smad7 are renoprotective. However, this counter-balancing mechanism is also altered because TGF-β1 induces Smurf2, a ubiquitin E3-ligase, to target Smad7 as well as Smad2 for degradation. Thus overexpression of renal Smad7 restores the balance of TGF-β/Smad signalling and has therapeutic effect on CKDs. Recent studies also found that Smad3 mediated renal fibrosis by up-regulating miR-21 (where miR represents microRNA) and miR-192, but down-regulating miR-29 and miR-200 families. Therefore restoring miR-29/miR-200 or suppressing miR-21/miR-192 is able to treat progressive renal fibrosis. Furthermore, activation of TGF-β/Smad signalling inhibits renal BMP-7 expression and BMP/Smad signalling. On the other hand, overexpression of renal BMP-7 is capable of inhibiting TGF-β/Smad3 signalling and protects the kidney from TGF-β-mediated renal injury. This counter-regulation not only expands our understanding of the causes of renal injury, but also suggests the therapeutic potential by targeting TGF-β/Smad signalling or restoring BMP-7 in CKDs. Taken together, the current understanding of the distinct roles and mechanisms of TGF-β and BMP-7 in CKDs implies that targeting the TGF-β/Smad pathway or restoring BMP-7 signalling may represent novel and effective therapies for CKDs.
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Luderer HF, Nazarian RM, Zhu ED, Demay MB. Ligand-dependent actions of the vitamin D receptor are required for activation of TGF-β signaling during the inflammatory response to cutaneous injury. Endocrinology 2013; 154:16-24. [PMID: 23132743 PMCID: PMC3529380 DOI: 10.1210/en.2012-1579] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The vitamin D receptor (VDR) has both 1,25-dihydroxyvitamin D-dependent and -independent actions in the epidermis. Ligand-dependent actions of the VDR have been shown to promote keratinocyte differentiation and to regulate formation of the epidermal barrier. In contrast, the actions of the VDR that regulate postmorphogenic hair cycling do not require 1,25-dihydroxyvitamin D. The VDR also has immunomodulatory actions that are dependent on its ligand, 1,25-dihydroxyvitamin D. To determine whether the ligand-dependent or -independent actions of the VDR regulate the inflammatory response to cutaneous injury, studies were performed in control, VDR knockout, and vitamin D-deficient mice. These investigations demonstrate that absence of receptor or ligand impairs the dermal response to cutaneous injury. Although neutrophil recruitment is not affected, the absence of VDR signaling leads to defects in macrophage recruitment and granulation tissue formation. Studies performed to identify the molecular basis for this phenotype demonstrate that absence of the VDR, or its ligand, impairs TGF-β signaling in the dermis, characterized by decreased expression of monocyte chemotactic protein-1 and reduced phosphorylation of phosphorylated Smad-3 as well as attenuated phosphorylated Smad-3 phosphorylation in response to TGF-β in primary dermal fibroblasts lacking the VDR. Thus, these data demonstrate that the liganded VDR interacts with the TGF-β signaling pathway to promote the normal inflammatory response to cutaneous injury.
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Affiliation(s)
- Hilary F Luderer
- Endocrine Unit and Dermatopathology Unit, Pathology Service, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA
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66
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Maeda H, Wada N, Tomokiyo A, Monnouchi S, Akamine A. Prospective potency of TGF-β1 on maintenance and regeneration of periodontal tissue. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2013; 304:283-367. [PMID: 23809439 DOI: 10.1016/b978-0-12-407696-9.00006-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Periodontal ligament (PDL) tissue, central in the periodontium, plays crucial roles in sustaining tooth in the bone socket. Irreparable damages of this tissue provoke tooth loss, causing a decreased quality of life. The question arises as to how PDL tissue is maintained or how the lost PDL tissue can be regenerated. Stem cells included in PDL tissue (PDLSCs) are widely accepted to have the potential to maintain or regenerate the periodontium, but PDLSCs are very few in number. In recent studies, undifferentiated clonal human PDL cell lines were developed to elucidate the applicable potentials of PDLSCs for the periodontal regenerative medicine based on cell-based tissue engineering. In addition, it has been suggested that transforming growth factor-beta 1 is an eligible factor for the maintenance and regeneration of PDL tissue.
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Affiliation(s)
- Hidefumi Maeda
- Department of Endodontology, Kyushu University Hospital, Fukuoka, Japan.
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67
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Bechler SL, Si Y, Yu Y, Ren J, Liu B, Lynn DM. Reduction of intimal hyperplasia in injured rat arteries promoted by catheter balloons coated with polyelectrolyte multilayers that contain plasmid DNA encoding PKCδ. Biomaterials 2012; 34:226-36. [PMID: 23069712 DOI: 10.1016/j.biomaterials.2012.09.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Accepted: 09/04/2012] [Indexed: 10/27/2022]
Abstract
New therapeutic approaches that eliminate or reduce the occurrence of intimal hyperplasia following balloon angioplasty could improve the efficacy of vascular interventions and improve the quality of life of patients suffering from vascular diseases. Here, we report that treatment of arteries using catheter balloons coated with thin polyelectrolyte-based films ('polyelectrolyte multilayers', PEMs) can substantially reduce intimal hyperplasia in an in vivo rat model of vascular injury. We used a layer-by-layer (LbL) process to coat the surfaces of inflatable catheter balloons with PEMs composed of nanolayers of a cationic poly(β-amino ester) (polymer 1) and plasmid DNA (pPKCδ) encoding the δ isoform of protein kinase C (PKCδ), a regulator of apoptosis and other cell processes that has been demonstrated to reduce intimal hyperplasia in injured arterial tissue when administered via perfusion using viral vectors. Insertion of balloons coated with polymer 1/pPKCδ multilayers into injured arteries for 20 min resulted in local transfer of DNA and elevated levels of PKCδ expression in the media of treated tissue three days after delivery. IFC and IHC analysis revealed these levels of expression to promote downstream cellular processes associated with up-regulation of apoptosis. Analysis of arterial tissue 14 days after treatment revealed polymer 1/pPKCδ-coated balloons to reduce the occurrence of intimal hyperplasia by ~60% compared to balloons coated with films containing empty plasmid vectors. Our results demonstrate the potential therapeutic value of this nanotechnology-based approach to local gene delivery in the clinically important context of balloon-mediated vascular interventions. These PEM-based methods could also prove useful for other in vivo applications that require short-term, surface-mediated transfer of plasmid DNA.
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Affiliation(s)
- Shane L Bechler
- Department of Chemical and Biological Engineering, University of Wisconsin - Madison, Madison, WI 53706, USA
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68
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Singh NK, Kundumani-Sridharan V, Kumar S, Verma SK, Kotla S, Mukai H, Heckle MR, Rao GN. Protein kinase N1 is a novel substrate of NFATc1-mediated cyclin D1-CDK6 activity and modulates vascular smooth muscle cell division and migration leading to inward blood vessel wall remodeling. J Biol Chem 2012; 287:36291-304. [PMID: 22893700 DOI: 10.1074/jbc.m112.361220] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Toward understanding the mechanisms of vascular wall remodeling, here we have studied the role of NFATc1 in MCP-1-induced human aortic smooth muscle cell (HASMC) growth and migration and injury-induced rat aortic wall remodeling. We have identified PKN1 as a novel downstream target of NFATc1-cyclin D1/CDK6 activity in mediating vascular wall remodeling following injury. MCP-1, a potent chemoattractant protein, besides enhancing HASMC motility, also induced its growth, and these effects require NFATc1-dependent cyclin D1 expression and CDK4/6 activity. In addition, MCP-1 induced PKN1 activation in a sustained and NFATc1-cyclin D1/CDK6-dependent manner. Furthermore, PKN1 activation is required for MCP-1-induced HASMC growth and migration. Balloon injury induced PKN1 activation in NFAT-dependent manner and pharmacological or dominant negative mutant-mediated blockade of PKN1 function or siRNA-mediated down-regulation of its levels substantially suppressed balloon injury-induced smooth muscle cell migration and proliferation resulting in reduced neointima formation. These novel findings suggest that PKN1 plays a critical role in vascular wall remodeling, and therefore, it could be a promising new target for the next generation of drugs for vascular diseases, particularly restenosis following angioplasty, stent implantation, or vein grafting.
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Affiliation(s)
- Nikhlesh K Singh
- Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee 38163, USA
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69
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Suwanabol PA, Seedial SM, Shi X, Zhang F, Yamanouchi D, Roenneburg D, Liu B, Kent KC. Transforming growth factor-β increases vascular smooth muscle cell proliferation through the Smad3 and extracellular signal-regulated kinase mitogen-activated protein kinases pathways. J Vasc Surg 2012; 56:446-54. [PMID: 22521802 PMCID: PMC3408812 DOI: 10.1016/j.jvs.2011.12.038] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2011] [Revised: 12/15/2011] [Accepted: 12/18/2011] [Indexed: 01/26/2023]
Abstract
INTRODUCTION We have previously demonstrated that transforming growth factor-β (TGF-β) in the presence of elevated levels of Smad3, its primary signaling protein, stimulates rat vascular smooth muscle cell (VSMC) proliferation and intimal hyperplasia. The mechanism is partly through the nuclear exportation of phosphorylated cyclin-dependent kinase inhibitor p27. The objective of this study is to clarify the downstream pathways through which Smad3 produces its proliferative effect. Specifically, we evaluated the role of extracellular signal-regulated kinase (ERK) mitogen-activated protein kinase (MAPK) in TGF-β-induced VSMC proliferation. METHODS Cultured rat aortic VSMCs were incubated with TGF-β at varying concentrations and times, and phosphorylated ERK was measured by Western blotting. Smad3 was enhanced in VSMCs using an adenovirus expressing Smad3 or inhibited with small interfering RNA (siRNA). For in vivo experiments, male Sprague-Dawley rats underwent carotid balloon injury, followed by intraluminal infection with an adenovirus expressing Smad3. Arteries were harvested at 3 days and subjected to immunohistochemistry for Smad3, phospho-ERK MAPK, and proliferating cell nuclear antigen. RESULTS In cultured VSMCs, TGF-β induced activation and phosphorylation of ERK MAPK in a time-dependent and concentration-dependent manner. Overexpression of the signaling protein Smad3 enhanced TGF-β-induced activation of ERK MAPK, whereas inhibition of Smad3 with a siRNA blocked ERK MAPK phosphorylation in response to TGF-β. These data suggest that Smad3 acts as a signaling intermediate between TGF-β and ERK MAPK. Inhibition of ERK MAPK activation with PD98059 completely blocked the ability of TGF-β/Smad3 to stimulate VSMC proliferation, demonstrating the importance of ERK MAPK in this pathway. Immunoprecipitation of phospho-ERK MAPK and blotting with Smad3 revealed a physical association, suggesting that activation of ERK MAPK by Smad3 requires a direct interaction. In an in vivo rat carotid injury model, overexpression of Smad3 resulted in an increase in phosphorylated ERK MAPK as well as increased VSMC proliferation as measured by proliferating cell nuclear antigen. CONCLUSIONS Our findings demonstrate a mechanism through which TGF-β stimulates VSMC proliferation. Although TGF-β has been traditionally identified as an inhibitor of proliferation, our data suggest that TGF-β enhances VSMC proliferation through a Smad3/ERK MAPK signaling pathway. These findings at least partly explain the mechanism by which TGF-β enhances intimal hyperplasia. Knowledge of this pathway provides potential novel targets that may be used to prevent restenosis.
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Affiliation(s)
| | | | - Xudong Shi
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792 U.S.A
| | - Fan Zhang
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792 U.S.A
| | - Dai Yamanouchi
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792 U.S.A
| | - Drew Roenneburg
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792 U.S.A
| | - Bo Liu
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792 U.S.A
| | - K. Craig Kent
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792 U.S.A
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Li J, Liu S, Li W, Hu S, Xiong J, Shu X, Hu Q, Zheng Q, Song Z. Vascular smooth muscle cell apoptosis promotes transplant arteriosclerosis through inducing the production of SDF-1α. Am J Transplant 2012; 12:2029-43. [PMID: 22845908 DOI: 10.1111/j.1600-6143.2012.04082.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Transplant arteriosclerosis is a leading cause of late allograft loss. Medial smooth muscle cell (SMC) apoptosis is considered to be an important event in transplant arteriosclerosis. However, the precise contribution of medial SMC apoptosis to transplant arteriosclerosis and the underlying mechanisms remain unclear. We transferred wild-type p53 to induce apoptosis of cultured SMCs. We found that apoptosis induces the production of SDF-1α from apoptotic and neighboring viable cells, resulting in increased SDF-1α in the culture media. Conditioned media from Ltv-p53-transferred SMCs activated PI3K/Akt/mTOR and MAPK/Erk signaling in a SDF-1α-dependent manner and thereby promoted mesenchymal stem cell (MSC) migration and proliferation. In a rat aorta transplantation model, lentivirus-mediated BclxL transfer selectively inhibits medial SMC apoptosis in aortic allografts, resulting in a remarkable decrease of SDF-1α both in allograft media and in blood plasma, associated with diminished recruitment of CD90(+)CD105(+) double-positive cells and impaired neointimal formation. Systemic administration of rapamycin or PD98059 also attenuated MSC recruitment and neointimal formation in the aortic allografts. These results suggest that medial SMC apoptosis is critical for the development of transplant arteriosclerosis through inducing SDF-1α production and that MSC recruitment represents a major component of vascular remodeling, constituting a relevant target and mechanism for therapeutic interventions.
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Affiliation(s)
- J Li
- Division of Liver Transplantation, Department of General Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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71
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Suwanabol PA, Seedial SM, Zhang F, Shi X, Si Y, Liu B, Kent KC. TGF-β and Smad3 modulate PI3K/Akt signaling pathway in vascular smooth muscle cells. Am J Physiol Heart Circ Physiol 2012; 302:H2211-9. [PMID: 22447946 PMCID: PMC3378292 DOI: 10.1152/ajpheart.00966.2011] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Accepted: 03/21/2012] [Indexed: 12/29/2022]
Abstract
Transforming growth factor-β (TGF-β) is upregulated at the time of arterial injury; however, the mechanism through which TGF-β enhances the development of intimal hyperplasia is not clear. Recent studies from our laboratory suggest that in the presence of elevated levels of Smad3, TGF-β stimulates smooth muscle cell (SMC) proliferation. This is a novel phenomenon in that TGF-β has traditionally been known as a potent inhibitor of cellular proliferation. In these studies we explore the signaling pathways through which TGF-β mediates its proliferative effect in vascular SMCs. We found that TGF-β phosphorylates and activates Akt in a time-dependent manner, and this effect is significantly enhanced by overexpression of Smad3. Furthermore, both chemical and molecular inhibition of Smad3 can reverse the effect of TGF-β on Akt. Although we found numerous signaling pathways that might function as intermediates between Smad3 and Akt, p38 appeared the most promising. Overexpression of Smad3 enhanced p38 phosphorylation and inhibition of p38 with a chemical inhibitor or a small interfering RNA blocked TGF-β-induced Akt phosphorylation. Moreover, TGF-β/Smad3 enhancement of SMC proliferation was blocked by inhibition of p38. Phosphorylation of Akt by TGF-β/Smad3 was not dependent on gene expression or protein synthesis, and immunoprecipitation studies revealed a physical association among p38, Akt, and Smad3 suggesting that activation requires a direct protein-protein interaction. Our findings were confirmed in vivo where overexpression of Smad3 in a rat carotid injury model led to enhancement of p-p38, p-Akt, as well as SMC proliferation. Furthermore, inhibition of p38 in vivo led to decreased Akt phosphorylation and SMC proliferation. In summary, our studies reveal a novel pathway whereby TGF-β/Smad3 stimulates SMC proliferation through p38 and Akt. These findings provide a potential mechanism for the substantial effect of TGF-β on intimal hyperplasia and suggest new targets for chemical or molecular prevention of vascular restenosis.
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MESH Headings
- Animals
- Carotid Artery Injuries/physiopathology
- Cell Proliferation/drug effects
- Cells, Cultured
- In Vitro Techniques
- Male
- Models, Animal
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Phosphatidylinositol 3-Kinases/physiology
- Phosphorylation/physiology
- Proto-Oncogene Proteins c-akt/physiology
- RNA, Small Interfering/pharmacology
- Rats
- Rats, Sprague-Dawley
- Signal Transduction/physiology
- Smad3 Protein/antagonists & inhibitors
- Smad3 Protein/drug effects
- Smad3 Protein/physiology
- Time Factors
- Transforming Growth Factor beta/pharmacology
- Transforming Growth Factor beta/physiology
- p38 Mitogen-Activated Protein Kinases/antagonists & inhibitors
- p38 Mitogen-Activated Protein Kinases/drug effects
- p38 Mitogen-Activated Protein Kinases/physiology
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Affiliation(s)
- Pasithorn A Suwanabol
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin, Madison, 53592-7375, USA
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72
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Lee JM, Kim BS, Lee H, Im GI. In vivo tracking of mesechymal stem cells using fluorescent nanoparticles in an osteochondral repair model. Mol Ther 2012; 20:1434-42. [PMID: 22491215 DOI: 10.1038/mt.2012.60] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
We devised and tested an in vivo system to monitor the migration of mesenchymal stem cells (MSCs) within the marrow cavity. In vitro studies confirmed that platelet-derived growth factor (PDGF)-AA had the most potent chemotactic effect of the tested factors, and possessed the greatest number of receptors in MSCs. MSCs were labeled with fluorescent nanoparticles and injected into the marrow cavity of nude rats through osteochondral defects created in the distal femur. The defects were sealed with HCF (heparin-conjugated fibrin) or PDGF-AA-loaded HCF. In the HCF-only group, the nanoparticle-labeled MSCs dispersed outside the marrow cavity within 3 days after injection. In the PDGF-AA-loaded HCF group, the labeled cells moved time-dependently for 14 days toward the osteochondral defect. HCF-PDGF in low dose (LD; 8.5 ng/µl) was more effective than HCF-PDGF in high dose (HD; 17 ng/µl) in recruiting the MSCs to the osteochondral defect. After 21 days, the defects treated with PDGF and transforming growth factor (TGF)-β1-loaded HCF showed excellent cartilage repair compared with other groups. Further studies confirmed that this in vivo osteochondral MSCs tracking system (IOMTS) worked for other chemoattractants (chemokine (C-C motif) ligand 2 (CCL2) and PDGF-BB). IOMTS can provide a useful tool to examine the effect of growth factors or chemokines on endogenous cartilage repair.
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Affiliation(s)
- Jong Min Lee
- Department of Orthopaedics, Dongguk University Ilsan Hospital, Goyang, Korea
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Meng XM, Huang XR, Xiao J, Chen HY, Zhong X, Chung ACK, Lan HY. Diverse roles of TGF-β receptor II in renal fibrosis and inflammation in vivo and in vitro. J Pathol 2012; 227:175-88. [PMID: 22190171 DOI: 10.1002/path.3976] [Citation(s) in RCA: 121] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 11/07/2011] [Accepted: 12/02/2011] [Indexed: 11/09/2022]
Abstract
TGF-β1 binds receptor II (TβRII) to exert its biological activities but its functional importance in kidney diseases remains largely unclear. In the present study, we hypothesized that TβRII may function to initiate the downstream TGF-β signalling and determine the diverse role of TGF-β1 in kidney injury. The hypothesis was examined in a model of unilateral ureteral obstructive (UUO) nephropathy and in kidney fibroblasts and tubular epithelial cells in which the TβRII was deleted conditionally. We found that disruption of TβRII inhibited severe tubulointerstitial fibrosis in the UUO kidney, which was associated with the impairment of TGF-β/Smad3 signalling, but not with the ERK/p38 MAP kinase pathway. In contrast, deletion of TβRII enhanced NF-κB signalling and renal inflammation including up-regulation of Il-1β and Tnfα in the UUO kidney. Similarly, in vitro disruption of TβRII from kidney fibroblasts or tubular epithelial cells inhibited TGF-β1-induced Smad signalling and fibrosis but impaired the anti-inflammatory effect of TGF-β1 on IL-1β-stimulated NF-κB activation and pro-inflammatory cytokine expression. In conclusion, TβRII plays an important but diverse role in regulating renal fibrosis and inflammation. Impaired TGF-β/Smad3, but not the non-canonical TGF-β signalling pathway, may be a key mechanism by which disruption of TβRII protects against renal fibrosis. In addition, deletion of TβRII also enhances NF-κB signalling along with up-regulation of renal pro-inflammatory cytokines, which may be associated with the impairment of anti-inflammatory properties of TGF-β1.
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Affiliation(s)
- Xiao-Ming Meng
- Li Ka Shing Institute of Health Sciences and Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong SAR, China
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Si Y, Ren J, Wang P, Rateri DL, Daugherty A, Shi XD, Kent KC, Liu B. Protein kinase C-delta mediates adventitial cell migration through regulation of monocyte chemoattractant protein-1 expression in a rat angioplasty model. Arterioscler Thromb Vasc Biol 2012; 32:943-54. [PMID: 22328773 DOI: 10.1161/atvbaha.111.244921] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The adventitia is increasingly recognized as an important player during the development of intimal hyperplasia. However, the mechanism of adventitial cell recruitment to the subintimal space remains largely undefined. We have shown previously that gene transfer of protein kinase C-delta (PKCδ) increases apoptosis of smooth muscle cells following balloon injury. In the current study, we investigated a potential role of PKCδ in regulating the recruitment of adventitial cells. METHODS AND RESULTS Conditioned media from PKCδ-overexpressing smooth muscle cells stimulated migration and CCR2 expression of adventitial fibroblasts through a MCP-1 dependent mechanism. Following balloon injury of rat carotid arteries, overexpression of PKCδ in smooth muscle cells significantly increased MCP-1 and CCR2 expression and the number of adventitia-originated cells detected in the neointima. Administration of an anti-MCP-1 antibody markedly diminished the recruitment of adventitial cells. Combined PKCδ overexpression and anti-MCP-1 inhibited intimal hyperplasia more effectively than either approach alone. CONCLUSIONS Our data suggest that PKCδ regulates recruitment of adventitial cells to the neointima via a mechanism involving upregulation of the MCP-1/CCR2 signaling axis in injured arteries. Blockage of MCP-1 while enhancing apoptosis may serve as a potential therapeutic strategy to attenuate intimal hyperplasia.
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Affiliation(s)
- Yi Si
- Division of Vascular Surgery, University of Wisconsin Madison, 53705, USA
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75
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McBane JE, Cai K, Labow RS, Santerre JP. Co-culturing monocytes with smooth muscle cells improves cell distribution within a degradable polyurethane scaffold and reduces inflammatory cytokines. Acta Biomater 2012; 8:488-501. [PMID: 21971418 DOI: 10.1016/j.actbio.2011.09.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 08/23/2011] [Accepted: 09/16/2011] [Indexed: 01/12/2023]
Abstract
Activated monocytes can promote inflammation or wound repair, depending on the nature of the implant environment. Recent work showed that a degradable, polar-hydrophobic-ionic polyurethane (D-PHI) induced an anti-inflammatory monocyte phenotype. In the current study it is hypothesized that wound-healing phenotype monocytes (activated by D-PHI material chemistry) will promote human vascular smooth muscle cells (hVSMC) to attach and migrate into porous D-PHI scaffolds. hVSMC migration is necessary for hVSMC population of the scaffold and tissue formation to occur, and then, once tissue formation is complete, the monocyte should promote contractile phenotype markers in the hVSMC. hVSMC were cultured for up to 28 days with or without monocytes and analyzed for cell viability, attachment (DNA) and migration. Lysates were analyzed for the hVSMC contractile phenotype markers calponin and α-smooth muscle actin (α-SMA) as well as urokinase plasminogen activator (uPA; pro-migration marker) using immunoblotting analysis. Histological staining showed that hVSMC alone remained around the perimeter of the scaffold, whereas co-culture samples had co-localization of monocytes with hVSMC in the pores, a more even cell distribution throughout the scaffold and increased total cell attachment (P<0.05). Co-culture samples had higher cell numbers and more DNA than the addition of both single cell cultures. The water-soluble tetrazolium-1 data suggested that cells were not dying over the 28 day culture period. Calponin, also linked to cell motility, was maintained up to 28 days in the co-culture and hVSMC alone, whereas α-SMA disappeared after 7 days. Co-cultures on D-PHI showed that monocytes were activated to a wound-healing phenotype (low TNF-α, elevated IL-10), while promoting uPA expression. In summary, this study showed that, by co-culturing monocytes with hVSMC, the latter showed increased total cell attachment and infiltration into the D-PHI scaffold compared with hVSMC alone, suggesting that monocytes may promote hVSMC migration, a condition necessary for ultimately achieving uniform tissue formation in porous scaffolds.
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Affiliation(s)
- Joanne E McBane
- Institute of Biomaterials and Biomedical Engineering, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada M5G 1G6
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76
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Zhang F, Banker G, Liu X, Suwanabol PA, Lengfeld J, Yamanouchi D, Kent KC, Liu B. The novel function of advanced glycation end products in regulation of MMP-9 production. J Surg Res 2011; 171:871-6. [PMID: 20638679 PMCID: PMC3623272 DOI: 10.1016/j.jss.2010.04.027] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 03/26/2010] [Accepted: 04/15/2010] [Indexed: 10/19/2022]
Abstract
BACKGROUND Advanced glycation end products (AGEs), formed from proteins and peptides by nonenzymatic glycoxidation after contact with aldose sugars, have been implicated in the pathogenesis of age-related cardiac and vascular dysfunction. Our previous study demonstrated significantly elevated levels of AGE and the receptor for AGE (RAGE) in human abdominal aortic aneurysm (AAA) tissues. Inhibition of AGE signaling by targeted gene deletion of RAGE markedly reduced the development of aneurysm in a mouse model of AAA. We also showed that AGE may stimulate aneurysm formation by promoting metalloproteinase (MMP)-9 expression. In this study, we investigated the molecular mechanism underlying this novel function of AGE. METHODS The murine macrophage cell line RAW 264.7 was pretreated with AGE, TGF-β, and MAPK inhibitors. The protein was collected for Western blot analysis. Culture supernatants were collected to determine MMP-9 activity by gelatin zymography. RESULTS We found that AGE induced the production of MMP-9 in macrophages in a dose-dependent manner. This induction of MMP-9 was markedly diminished by pretreatment with TGF-β. To delineate the underlying molecular mechanism, we showed that AGE increased phosphorylation of p44/42 ERK, p38, JNK, and PI3K in macrophages. Moreover, AGE induced active p65 subunit of NF- κB. Inhibition of ERK (UO126) or p38 (SB203580), but not PI3K (LY294002 or wortmannin), blocked AGE-induced MMP-9 expression. In contrast, inhibition of JNK (SP-600125) significantly enhanced the stimulatory effect of AGE on MMP-9. Furthermore, TGF-β suppressed AGE-induced expression of the active p65 subunit of NF-κB. CONCLUSIONS Our data indicate that AGE induces MMP-9 through activation of ERK, p38 mitogen-activated protein and NF-κB, a pathway that is antagonized by TGF-β. This finding in conjunction with previously reported AGE functions in inflammation suggests that anti-AGE therapies could be effective in the prevention of human AAA development and progression.
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Affiliation(s)
- Fan Zhang
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine, Madison, Wisconsin
| | - Greg Banker
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine, Madison, Wisconsin
| | - Xiaodong Liu
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine, Madison, Wisconsin
| | - Pasithorn A. Suwanabol
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine, Madison, Wisconsin
| | - Justin Lengfeld
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine, Madison, Wisconsin
| | - Dai Yamanouchi
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine, Madison, Wisconsin
| | - K. Craig Kent
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine, Madison, Wisconsin
| | - Bo Liu
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine, Madison, Wisconsin
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Nair A, Shen J, Lotfi P, Ko CY, Zhang CC, Tang L. Biomaterial implants mediate autologous stem cell recruitment in mice. Acta Biomater 2011; 7:3887-95. [PMID: 21784181 DOI: 10.1016/j.actbio.2011.06.050] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Revised: 05/26/2011] [Accepted: 06/28/2011] [Indexed: 12/29/2022]
Abstract
Autologous stem cells, recognized as the best cells for stem cell therapy, are associated with difficult extraction procedures which often lead to more traumas for the patients and time-consuming laboratory work, which delays their subsequent application. To combat such challenges, it was recently uncovered that, shortly after biomaterial implantation, following the recruitment of inflammatory cells, substantial numbers of mesenchymal stem cells (MSC) and hematopoietic stem cells (HSC) were recruited to the implantation sites. These multipotent MSC could be differentiated into various lineages in vitro. Inflammatory signals may be responsible for the gathering of stem cells, since there is a good relationship between biomaterial-mediated inflammatory responses and stem cell accumulation in vivo. In addition, the treatment with the anti-inflammatory drug dexamethasone substantially reduced the recruitment of both MSC and HSC. The results from this work support that such strategies could be further developed towards localized recruitment and differentiation of progenitor cells. This may permit the future development of autologous stem cell therapies without the need for tedious cell isolation, culture and transplantation.
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Affiliation(s)
- A Nair
- Bioengineering Department, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA
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78
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Zheng Q, Liu S, Song Z. Mechanism of arterial remodeling in chronic allograft vasculopathy. Front Med 2011; 5:248-53. [DOI: 10.1007/s11684-011-0149-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Accepted: 07/07/2011] [Indexed: 11/29/2022]
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79
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Boyle AJ, Yeghiazarians Y, Shih H, Hwang J, Ye J, Sievers R, Zheng D, Palasubramaniam J, Palasubramaniam D, Karschimkus C, Whitbourn R, Jenkins A, Wilson AM. Myocardial production and release of MCP-1 and SDF-1 following myocardial infarction: differences between mice and man. J Transl Med 2011; 9:150. [PMID: 21910857 PMCID: PMC3180393 DOI: 10.1186/1479-5876-9-150] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2011] [Accepted: 09/12/2011] [Indexed: 12/27/2022] Open
Abstract
Background Stem cell homing to the heart is mediated by the release of chemo-attractant cytokines. Stromal derived factor -1 alpha (SDF-1a) and monocyte chemotactic factor 1(MCP-1) are detectable in peripheral blood after myocardial infarction (MI). It remains unknown if they are produced by, and released from, the heart in order to attract stem cells to repair the damaged myocardium. Methods Murine hearts were studied for expression of MCP-1 and SDF-1a at day 3 and day 28 following myocardial infarction to determine whether production is increased following MI. In addition, we studied the coronary artery and coronary sinus (venous) blood from patients with normal coronary arteries, stable coronary artery disease (CAD), unstable angina and MI to determine whether these cytokines are released from the heart into the systemic circulation following MI. Results Both MCP-1 and SDF-1a are constitutively produced and released by the heart. MCP-1 mRNA is upregulated following murine experimental MI, but SDF-1a is suppressed. There is less release of SDF-1a into the systemic circulation in patients with all stages of CAD including MI, mimicking the animal model. However MCP-1 release from the human heart following MI is also suppressed, which is the exact opposite of the animal model. Conclusions SDF-1a and MCP-1 release from the human heart are suppressed following MI. In the case of SDF-1a, the animal model appropriately reflects the human situation. However, for MCP-1 the animal model is the exact opposite of the human condition. Human observational studies like this one are paramount in guiding translation from experimental studies to clinical trials.
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Affiliation(s)
- Andrew J Boyle
- Department of Medicine, Division of Cardiology, University of California San Francisco, USA.
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80
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Yan P, Xia C, Duan C, Li S, Mei Z. Biological characteristics of foam cell formation in smooth muscle cells derived from bone marrow stem cells. Int J Biol Sci 2011; 7:937-46. [PMID: 21850203 PMCID: PMC3157268 DOI: 10.7150/ijbs.7.937] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 07/27/2011] [Indexed: 01/01/2023] Open
Abstract
Bone marrow mesenchymal stem cells (BMSC) can differentiate into diverse cell types, including adipogenic, osteogenic, chondrogenic and myogenic lineages. There are lots of BMSC accumulated in atherosclerosis vessels and differentiate into VSMC. However, it is unclear whether VSMC originated from BMSC (BMSC-SMC) could remodel the vessel in new tunica intima or promote the pathogenesis of atherosclerosis. In this study, BMSC were differentiated into VSMC in response to the transforming growth factor β (TGF-β) and shown to express a number of VSMC markers, such as α-smooth muscle actin (α-SMA) and smooth muscle myosin heavy chain1 (SM-MHC1). BMSC-SMC became foam cells after treatment with 80 mg/L ox-LDL for 72 hours. Ox-LDL could upregulate scavenger receptor class A (SR-A) but downregulate the ATP-binding cassette transporter A1 (ABCA1) and caveolin-1 protein expression, suggesting that modulating relative protein activity contributes to smooth muscle foam cell formation in BMSC-SMC. Furthermore, we found that BMSC-SMC have some biological characteristics that are similar to VSMC, such as the ability of proliferation and secretion of extracellular matrix, but, at the same time, retain some biological characteristics of BMSC, such as a high level of migration. These results suggest that BMSC-SMC could be induced to foam cells and be involved in the development of atherosclerosis.
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Affiliation(s)
- Pengke Yan
- Department of Pharmacy, The Third Affiliated Hospital of Guangzhou Medical College, Guangzhou 510150, China.
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81
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Identification of chemoattractive factors involved in the migration of bone marrow-derived mesenchymal stem cells to brain lesions caused by prions. J Virol 2011; 85:11069-78. [PMID: 21813601 DOI: 10.1128/jvi.05318-11] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Bone marrow-derived mesenchymal stem cells (MSCs) have been reported to migrate to brain lesions of neurodegenerative diseases; however, the precise mechanisms by which MSCs migrate remain to be elucidated. In this study, we carried out an in vitro migration assay to investigate the chemoattractive factors for MSCs in the brains of prion-infected mice. The migration of immortalized human MSCs (hMSCs) was reduced by their pretreatment with antibodies against the chemokine receptors, CCR3, CCR5, CXCR3, and CXCR4 and by pretreatment of brain extracts of prion-infected mice with antibodies against the corresponding ligands, suggesting the involvement of these receptors, and their ligands in the migration of hMSCs. In agreement with the results of an in vitro migration assay, hMSCs in the corpus callosum, which are considered to be migrating from the transplanted area toward brain lesions of prion-infected mice, expressed CCR3, CCR5, CXCR3, and CXCR4. The combined in vitro and in vivo analyses suggest that CCR3, CCR5, CXCR3, and CXCR4, and their corresponding ligands are involved in the migration of hMSCs to the brain lesions caused by prion propagation. In addition, hMSCs that had migrated to the right hippocampus of prion-infected mice expressed CCR1, CX3CR1, and CXCR4, implying the involvement of these chemokine receptors in hMSC functions after chemotactic migration. Further elucidation of the mechanisms that underlie the migration of MSCs may provide useful information regarding application of MSCs to the treatment of prion diseases.
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82
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Suwanabol PA, Kent KC, Liu B. TGF-β and restenosis revisited: a Smad link. J Surg Res 2011; 167:287-97. [PMID: 21324395 PMCID: PMC3077463 DOI: 10.1016/j.jss.2010.12.020] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Revised: 12/12/2010] [Accepted: 12/15/2010] [Indexed: 01/17/2023]
Abstract
Despite novel surgical therapies for the treatment of atherosclerosis, restenosis continues to be a significant impediment to the long-term success of vascular interventions. Transforming growth factor-beta (TGF-β), a family of cytokines found to be up-regulated at sites of arterial injury, has long been implicated in restenosis; a role that has largely been attributed to TGF-β-mediated vascular fibrosis. However, emerging data indicate that the role of TGF-β in intimal thickening and arterial remodeling, the critical components of restenosis, is complex and multidirectional. Recent advancements have clarified the basic signaling pathway of TGF-β, making evident the need to redefine the precise role of this family of cytokines and its primary signaling pathway, Smad, in restenosis. Unraveling TGF-β signaling in intimal thickening and arterial remodeling will pave the way for a clearer understanding of restenosis and the development of innovative pharmacological therapies.
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Affiliation(s)
- Pasithorn A. Suwanabol
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - K. Craig Kent
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Bo Liu
- Department of Surgery, Division of Vascular Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
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83
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Gong Z, Niklason LE. Use of human mesenchymal stem cells as alternative source of smooth muscle cells in vessel engineering. Methods Mol Biol 2011; 698:279-94. [PMID: 21431526 DOI: 10.1007/978-1-60761-999-4_21] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Adult stem cell-derived smooth muscle cells (SMC) may be a promising source of cells for applications in regenerative medicine, including cardiovascular tissue engineering. Primary SMC from native vessels may have limited proliferative capacity and reduced collagen production when sourced from elderly donors, who are the patients in need of vascular grafts due to coronary disease or peripheral arterial disease. Our recent work showed that the ability of human bone marrow-derived mesenchymal stem cells (hMSCs) to differentiate into SMC was modulated by various growth factors, matrix proteins, and mechanical forces. In addition, the components of the culture medium play a very important role in SMC differentiation from hMSCs. In this chapter, we will summarize our experience with the impact of various factors on SMC differentiation from hMSCs. Based upon our findings regarding growth factors, cyclic strain and matrix proteins, a two-phase vessel regeneration culture protocol including a 4-week proliferation phase and a 4-week differentiation phase was developed to optimize proliferation and SMC differentiation of hMSCs consecutively.
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Affiliation(s)
- Zhaodi Gong
- Department of Anesthesia & Biomedical Engineering, Yale University School of Medicine, New Haven, CT, USA
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84
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Díaz-Valdés N, Basagoiti M, Dotor J, Aranda F, Monreal I, Riezu-Boj JI, Borrás-Cuesta F, Sarobe P, Feijoó E. Induction of monocyte chemoattractant protein-1 and interleukin-10 by TGFbeta1 in melanoma enhances tumor infiltration and immunosuppression. Cancer Res 2010; 71:812-21. [PMID: 21159663 DOI: 10.1158/0008-5472.can-10-2698] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Melanoma progression is associated with the expression of different growth factors, cytokines, and chemokines. Because TGFβ1 is a pleiotropic cytokine involved not only in physiologic processes but also in cancer development, we analyzed in A375 human melanoma cells, the effect of TGFβ1 on monocyte chemoattractant protein-1 (MCP-1) and interleukin-10 (IL-10) expression, two known factors responsible for melanoma progression. TGFβ1 increased the expression of MCP-1 and IL-10 in A375 cells, an effect mediated by the cross-talk between Smad, PI3K (phosphoinositide 3-kinase)/AKT, and BRAF-MAPK (mitogen activated protein kinase) signaling pathways. Supernatants from TGFβ1-treated A375 cells enhanced MCP-1-dependent migration of monocytes, which, in turn, expressed high levels of TGF,β1, bFGF, and VEGF mRNA. Moreover, these supernatants also inhibited functional properties of dendritic cells through IL-10-dependent mechanisms. When using in vitro, the TGFβ1-blocking peptide P144, TGFβ1-dependent Smad3 phosphorylation, and expression of MCP-1 and IL-10 were inhibited. In vivo, treatment of A375 tumor-bearing athymic mice with P144 significantly reduced tumor growth, associated with a lower macrophage infiltrate and decreased intratumor MCP-1 and VEGF levels, as well as angiogenesis. Finally, in C57BL/6 mice with B16-OVA melanoma tumors, when administered with immunotherapy, P144 decreased tumor growth and intratumor IL-10 levels, linked to enhanced activation of dendritic cells and natural killer cells, as well as anti-OVA T-cell responses. These results show new effects of TGFβ1 on melanoma cells, which promote tumor progression and immunosuppression, strongly reinforcing the relevance of this cytokine as a molecular target in melanoma.
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Affiliation(s)
- Nancy Díaz-Valdés
- Universidad de Navarra, Centro de Investigación Médica Aplicada, Área de Hepatología y Terapia Génica, Pamplona, Spain
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85
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Zhao J, Zhang P, Qin L, Pan XH. Hypoxia is essential for bone-tendon junction healing: the molecular biological evidence. INTERNATIONAL ORTHOPAEDICS 2010; 35:925-8. [PMID: 21127862 DOI: 10.1007/s00264-010-1157-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2010] [Revised: 10/24/2010] [Accepted: 10/30/2010] [Indexed: 11/29/2022]
Abstract
Bone-tendon junction (BTJ) injury is difficult to cure due to its special anatomical structure. Most methods applied for BTJ injury treatment cannot lead to the perfect restoration of the fibrocartilage zone and perfect vascular regeneration, which are two important facets of BTJ reconstruction. Based on current research, hypoxia, which has been discovered to induce chondrogenesis and angiogenesis in vivo, plays an essential role in the tissue repair process. Consequently, it is reasonable to confirm that a hypoxic environment is the prerequisite condition to obtain physiological healing of BTJ injury. In this paper, the potential relationship between hypoxia and BTJ healing is discussed. Moreover, an operation model and possible drug application to obtain hypoxic conditions are delineated.
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Affiliation(s)
- Jian Zhao
- Orthopedic Department, Affiliated Hospital of Nantong University, Xisi Road 20, 226001 Nantong City, China
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86
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Sakai Y, Uchida K, Nakayama H. Histopathological features and expression profiles of cytokines, chemokines and SOCS family proteins in trehalose 6,6'-dimycolate-induced granulomatous lesions. Inflamm Res 2010; 60:371-8. [PMID: 21110061 DOI: 10.1007/s00011-010-0280-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2010] [Revised: 10/11/2010] [Accepted: 11/01/2010] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVE AND DESIGN The objective of this paper is to elucidate the factors contributing to the development and regression of trehalose 6,6'-dimycolate (TDM)-induced model of tuberculous granulomatous lesions. MATERIALS AND TREATMENT BALB/c mice were twice injected i.p. with a 100 μl of w/o/w emulsion (100 μg of TDM, 3.2 μl of Freund's incomplete adjuvant, 3.2 μl of PBS, and 93.6 μl of saline containing 0.2% Tween 20) at a 1 week interval. The mice were killed at days 0, 3, 7, 14, or 21 after the last injection. Three mice were used per group. METHODS We examined histopathological changes of the lesions and defined the expression levels of cytokines and suppressor of cytokine signaling (SOCS) family proteins by real-time PCR. RESULTS The levels of inflammatory cytokine, such as TNF-α and IL-1β, paralleled with the size of the lesions and the levels of TGF-β and SOCS-3 were high at regression phase. DISCUSSION Our results demonstrated that both the down-regulation of inflammatory cytokines and up-regulation of TGF-β and SOCS-3 are crucial for histopathological changes including alteration in the sizes of the lesions and changes in inflammatory cell populations.
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Affiliation(s)
- Yusuke Sakai
- Department of Veterinary Pathology, Graduated School of Agricultural and Life sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan.
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Yang K, Wang XQ, He YS, Lu L, Chen QJ, Liu J, Shen WF. Advanced glycation end products induce chemokine/cytokine production via activation of p38 pathway and inhibit proliferation and migration of bone marrow mesenchymal stem cells. Cardiovasc Diabetol 2010; 9:66. [PMID: 20969783 PMCID: PMC2987998 DOI: 10.1186/1475-2840-9-66] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2010] [Accepted: 10/22/2010] [Indexed: 02/07/2023] Open
Abstract
Background Advanced glycation products (AGEs), as endogenous inflammatory mediator, compromise the physiological function of mesenchymal stem cells (MSCs). MSCs have a potential role in cell replacement therapy in acute myocardial infarction and ischemic cardiomyopathy. However, mechanisms of AGEs on MSCs are still not unveiled. Methods Reactive oxygen species (ROS), genes regulation, cell proliferation and migration have been detected by AGE-BSA stimulated MSCs. Results We found that in vitro stimulation with AGE-BSA induced generation of reactive oxygen species (ROS), and inhibited dose-dependently proliferation and migration of MSCs. Microarray and molecular biological assessment displayed an increased expression and secretion of Ccl2, Ccl3, Ccl4 and Il1b in a dose- and time-dependent manner. These chemokines/cytokines of equivalent concentration to those in conditioned medium exerted an inhibitory effect on MSC proliferation and migration after stimulation for 24 h. Transient elevation of phospho-p38 in MSCs upon AGE-BSA stimulation was blocked with p38 inhibitor. Conclusions The study indicates that AGE-BSA induces production of chemokines/cytokines in a dose- and time-dependent manner via activation of ROS-p38 mediated pathway. These chemokines/cytokines exert an inhibitory effect on MSC growth and migration, suggesting an amplified dysfunction of MSCs by AGEs.
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Affiliation(s)
- Ke Yang
- Department of Cardiology, Ruijin Hospital, Jiaotong University School of Medicine, Shanghai, P.R. China
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Gowran A, McKayed K, Kanichai M, White C, Hammadi N, Campbell V. Tissue Engineering of Cartilage; Can Cannabinoids Help? Pharmaceuticals (Basel) 2010; 3:2970-2985. [PMID: 27713386 PMCID: PMC4034107 DOI: 10.3390/ph3092970] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 08/30/2010] [Accepted: 09/03/2010] [Indexed: 12/16/2022] Open
Abstract
This review discusses the role of the cannabinoid system in cartilage tissue and endeavors to establish if targeting the cannabinoid system has potential in mesenchymal stem cell based tissue-engineered cartilage repair strategies. The review discusses the potential of cannabinoids to protect against the degradation of cartilage in inflamed arthritic joints and the influence of cannabinoids on the chondrocyte precursors, mesenchymal stem cells (MSCs). We provide experimental evidence to show that activation of the cannabinoid system enhances the survival, migration and chondrogenic differentiation of MSCs, which are three major tenets behind the success of a cell-based tissue-engineered cartilage repair strategy. These findings highlight the potential for cannabinoids to provide a dual function by acting as anti-inflammatory agents as well as regulators of MSC biology in order to enhance tissue engineering strategies aimed at cartilage repair.
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Affiliation(s)
- Aoife Gowran
- Trinity College Institute of Neuroscience and Department of Physiology, School of Medicine, University of Dublin, Trinity College, Dublin 2, Ireland.
| | - Katey McKayed
- Trinity College Institute of Neuroscience and Department of Physiology, School of Medicine, University of Dublin, Trinity College, Dublin 2, Ireland
- Trinity Centre for Bio-Engineering, School of Engineering, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Manoj Kanichai
- Trinity College Institute of Neuroscience and Department of Physiology, School of Medicine, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Cillian White
- Trinity College Institute of Neuroscience and Department of Physiology, School of Medicine, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Nissrin Hammadi
- Trinity College Institute of Neuroscience and Department of Physiology, School of Medicine, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Veronica Campbell
- Trinity College Institute of Neuroscience and Department of Physiology, School of Medicine, University of Dublin, Trinity College, Dublin 2, Ireland
- Trinity Centre for Bio-Engineering, School of Engineering, University of Dublin, Trinity College, Dublin 2, Ireland
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Tamburstuen MV, Reppe S, Spahr A, Sabetrasekh R, Kvalheim G, Slaby I, Syversen U, Lyngstadaas SP, Reseland JE. Ameloblastin promotes bone growth by enhancing proliferation of progenitor cells and by stimulating immunoregulators. Eur J Oral Sci 2010; 118:451-9. [PMID: 20831578 DOI: 10.1111/j.1600-0722.2010.00760.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In this study, we examined the role of the enamel matrix protein, ameloblastin, in bone growth and remodelling, and attempted to identify some of the molecular mechanisms involved in these processes. The effects of recombinant ameloblastin (rAmbn) were tested in vivo in rats, and in vitro in primary human mesenchymal stem cells, osteoblasts, chondrocytes, and osteoclasts. We used a microarray technique to identify genes that were regulated in human osteoblasts and verified our findings using multiplex protein analysis and real-time RT-PCR. Recombinant ameloblastin was found to stimulate bone healing in vivo, and to enhance the proliferation of mesenchymal stem cells and osteoblasts, as well as the differentiation of osteoclast precursor cells in vitro. The most profound effect was on the regulation of genes related to immune responses as well as on the expression of cytokines and markers of bone cell differentiation, indicating that ameloblastin has an effect on mesenchymal cell differentiation. A receptor has not yet been identified, but we found rAmbn to induce, directly and indirectly, signal transducer and activator of transcription (STAT) 1 and 2 and downstream factors in the interferon pathway.
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90
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Mutoh H, Sashikawa M, Hayakawa H, Sugano K. Monocyte chemoattractant protein-1 is generated via TGF-beta by myofibroblasts in gastric intestinal metaplasia and carcinoma without H. pylori infection. Cancer Sci 2010; 101:1783-9. [PMID: 20557309 PMCID: PMC11158495 DOI: 10.1111/j.1349-7006.2010.01609.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Helicobacter pylori (H. pylori) stimulates secretion of monocyte chemoattractant protein 1 (MCP-1) from gastric mucosa. Monocyte chemoattractant protein-1 (MCP-1) expression and macrophage infiltration are recognized in human gastric carcinoma. We have previously generated Cdx2-transgenic mice as model mice for intestinal metaplasia. Both chronic H. pylori-associated gastritis and Cdx2-transgenic mouse stomach develop intestinal metaplasia and finally gastric carcinoma. In this study we have directed our attention to MCP-1 expression in the intestinal metaplastic mucosa and the gastric carcinoma of Cdx2-transgenic mouse stomach. Quantitative real-time PCR was performed to determine MCP-1 and transforming growth factor-beta1 (TGF-beta1) mRNA expression levels and single- or double-label immunohistochemistry was used to evaluate the localization of MCP-1, TGF-beta type I receptor, and alpha-smooth muscle actin (alphaSMA). We determined that MCP-1 mRNA dramatically increased in the intestinal metaplastic mucosa and the gastric carcinoma of Cdx2-transgenic mouse stomach, compared with normal mouse stomach. Both MCP-1 and TGF-beta type I receptor were co-expressed in the alphaSMA-positive myofibroblasts of intestinal metaplastic mucosa and gastric carcinoma. Exogenous application of TGF-beta1 increased MCP-1 mRNA expression levels in the intestinal metaplastic tissue. Furthermore, TGF-beta1 was overexpressed and macrophage was strongly infiltrated in the gastric carcinoma. In conclusion, MCP-1 expression, which was stimulated by TGF-beta1, was recognized in the TGF-beta type I receptor-expressing myofibroblasts of the intestinal metaplastic mucosa and the gastric carcinoma of Cdx2-transgenic mouse stomach. The present results suggest that intestinal metaplasia and gastric carcinoma themselves induce MCP-1 expression independently of H. pylori infection.
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Affiliation(s)
- Hiroyuki Mutoh
- Department of Medicine, Division of Gastroenterology, Jichi Medical University, Shimotsuke, Tochigi, Japan.
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91
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Mishra P, Banerjee D, Ben-Baruch A. Chemokines at the crossroads of tumor-fibroblast interactions that promote malignancy. J Leukoc Biol 2010; 89:31-9. [PMID: 20628066 DOI: 10.1189/jlb.0310182] [Citation(s) in RCA: 174] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Cells of the tumor microenvironment play active roles in determining the malignancy phenotype. The host cells and the cancer cells cross-talk via a large variety of soluble factors, whose effects on both partners determine the final outcome of the tumorigenic process. In this review, we focus on the interactions between cancer cells and fibroblasts that are found in their proximity in the growing and progressing tumor and describe the roles of chemokines in mediating such cross-talks. Cancer-associated fibroblasts (CAFs, also termed tumor-associated fibroblasts) were found recently to acquire properties that promote tumor development and metastasis formation, as is also the case for specific members of the chemokine family. In this review, we suggest that there is a bidirectional cross-talk between tumor cells and CAFs, which leads via chemokine activities to increased malignancy. This cross-talk is manifested by the fact that cancer cells release factors that enhance the ability of the fibroblasts to secrete a variety of tumor-promoting chemokines, which then act back on the malignant cells to promote their proliferative, migratory, and invasive properties. The CAF-released chemokines also affect the tumor microenvironment, leading to increased angiogenesis and possibly to an elevated presence of cancer-supporting macrophages in tumors. Here, we describe these bidirectional interactions and the chemokines that are involved in these processes: mainly the CXCL12-CXCR4 pair but also other chemokines, including CCL2, CCL5, CCL7, CXCL8, and CXCL14. The overall findings suggest that chemokines stand at the crossroads of tumor-CAF interactions that lead to increased malignancy in many cancer diseases.
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Affiliation(s)
- Pravin Mishra
- Department of Medicine and Pharmacology, The Cancer Institute of New Jersey, Robert Wood Johnson Medical School University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey, USA
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92
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TGF-β and microvessel homeostasis. Microvasc Res 2010; 80:166-73. [DOI: 10.1016/j.mvr.2010.03.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Revised: 02/23/2010] [Accepted: 03/04/2010] [Indexed: 12/17/2022]
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93
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Huang XR, Chung ACK, Yang F, Yue W, Deng C, Lau CP, Tse HF, Lan HY. Smad3 mediates cardiac inflammation and fibrosis in angiotensin II-induced hypertensive cardiac remodeling. Hypertension 2010; 55:1165-71. [PMID: 20231525 DOI: 10.1161/hypertensionaha.109.147611] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Although Smad3 is a key mediator of fibrosis, the functional role of Smad3 in hypertensive cardiovascular disease remains unclear. The present study tested the hypothesis that angiotensin II may activate the transforming growth factor-beta/Smad3 pathway to mediate hypertensive cardiac remodeling in Smad3 knockout (KO) and wild-type mice by subcutaneous angiotensin II infusion and in the primary culture of Smad3 KO cardiac fibroblasts. Fourteen days after angiotensin II infusion, both Smad3 KO and wild-type mice developed equal levels of high blood pressure. However, hypertensive cardiac fibrosis and inflammation were developed in Smad3 wild-type but not in Smad3 KO mice. This was demonstrated by the findings that mice lacking Smad3 were protected against a fall in left ventricular ejection fraction (P<0.05), an increase in left ventricular mass (P<0.05), and the development of cardiac fibrosis and inflammation, including upregulation of transforming growth factor-beta1, connective tissue growth factor, collagen I/III, alpha-smooth muscle actin, interleukin 1beta, tumor necrosis factor-alpha, monocyte chemoattractant protein 1, intercellular adhesion molecule 1, and an increase in macrophage and T-cell infiltration in left ventricular tissues (all P<0.01, respectively). Additional studies in vitro also revealed that angiotensin II-induced cardiac fibrosis and inflammation were prevented in Smad3 KO cardiac fibroblasts. Inactivation of both Smad3 and nuclear factor kappaB/p65 signaling pathways was a key mechanism by which Smad3 KO mice were protected from angiotensin II-mediated hypertensive cardiac remodeling. In conclusion, Smad3 plays an essential role in hypertensive cardiac remodeling. Results from this study suggest that targeting Smad3 may be a novel therapeutic strategy for hypertensive cardiovascular disease.
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Affiliation(s)
- Xiao R Huang
- Department of Medicine and Therapeutics and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Shatin, NT, Hong Kong
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94
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Dietz HC. TGF-beta in the pathogenesis and prevention of disease: a matter of aneurysmic proportions. J Clin Invest 2010; 120:403-7. [PMID: 20101091 DOI: 10.1172/jci42014] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
TGF-beta regulates many aspects of cellular performance relevant to tissue morphogenesis and homeostasis. Postnatal perturbation of TGF-beta signaling contributes to the pathogenesis of many disease states, as recently exemplified through the study of Marfan syndrome (MFS), including aortic aneurysm and skeletal muscle myopathy. Heterogeneity in the regulation and consequences of TGF-beta signaling, amplified in the context of disease, has engendered confusion and controversy regarding its utility as a therapeutic target. Three studies recently published in the JCI, including one in this issue, underscore the complexity of this subject. Heydemann and colleagues implicate dimorphic variation in latent TGF-beta-binding protein 4 (LTBP4), a regulator of TGF-beta bioavailability and activation, as a modifier of muscular dystrophy in gamma-sarcoglycan-deficient mice. In contrast to experience with ascending aortic aneurysm in MFS, Wang and colleagues show that systemic abrogation of TGF-beta signaling worsens (rather than attenuates) Ang II-induced abdominal aortic aneurysm progression in mice. Tieu and colleagues define alterations in the regulation of vascular inflammation in the pathogenesis of Ang II-induced aneurysm and dissection in mice, which may help shed some light on this apparent paradox.
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Affiliation(s)
- Harry C Dietz
- Institute of Genetic Medicine and Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
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95
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Yamanouchi D, Kato K, Ryer EJ, Zhang F, Liu B. Protein kinase C delta mediates arterial injury responses through regulation of vascular smooth muscle cell apoptosis. Cardiovasc Res 2009; 85:434-43. [PMID: 19808702 DOI: 10.1093/cvr/cvp328] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
AIMS A balance between apoptosis and proliferation of vascular smooth muscle cells (VSMC) influences the development of intimal hyperplasia. We have previously demonstrated that protein kinase C delta (PKCdelta) regulates both apoptosis and proliferation of VSMC in vitro. Here we investigate the role of PKCdelta in intimal hyperplasia through gene deletion or overexpression in rodent models of arterial injury. METHODS AND RESULTS Arterial injury was induced in mice and rats by means of carotid ligation or balloon angioplasty, respectively. Overexpression of PKCdelta was achieved by adenovirus-mediated gene transfer immediately after balloon injury in rat carotid arteries. Levels of PKCdelta protein were profoundly increased in the carotid wall 3-7 days after balloon injury, co-localizing to TUNEL-positive medial cells. When subjected to arterial injury, PKCdelta gene-deficient mice responded with an enhanced intimal hyperplasia accompanied by an 80% reduction in the number of TUNEL-positive cells detected in the injured arteries as compared with their wild-type littermates. Conversely, arterial gene transfer of PKCdelta further increased the arterial expression of PKCdelta, which was associated with a marked increase in apoptosis and reduction of intimal hyperplasia. Neither manipulation led to significant alteration in cell proliferation, suggesting that the function of PKCdelta after arterial injury is predominantly pro-apoptotic. This notion is further supported by our observation of high PKCdelta expression in human restenotic lesions that also co-localized with apoptosis. CONCLUSION The expression of PKCdelta is upregulated in the arterial wall in response to injury. This induction appears to be a mechanism of arterial response that negatively influences the degree of intimal hyperplasia by stimulating VSMC apoptosis.
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Affiliation(s)
- Dai Yamanouchi
- Division of Peripheral Vascular Surgery, Department of Surgery, University of Wisconsin Madison, 1111 Highland Avenue, WIMR 5120, Madison, WI 53705, USA
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