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Li G, Gao J, Ding P, Gao Y. The role of endothelial cell-pericyte interactions in vascularization and diseases. J Adv Res 2024:S2090-1232(24)00029-8. [PMID: 38246244 DOI: 10.1016/j.jare.2024.01.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/11/2024] [Accepted: 01/12/2024] [Indexed: 01/23/2024] Open
Abstract
BACKGROUND Endothelial cells (ECs) and pericytes (PCs) are crucial components of the vascular system, with ECs lining the inner layer of blood vessels and PCs surrounding capillaries to regulate blood flow and angiogenesis. Intercellular communication between ECs and PCs is vital for the formation, stability, and function of blood vessels. Various signaling pathways, such as the vascular endothelial growth factor/vascular endothelial growth factor receptor pathway and the platelet-derived growth factor-B/platelet-derived growth factor receptor-β pathway, play roles in communication between ECs and PCs. Dysfunctional communication between these cells is associated with various diseases, including vascular diseases, central nervous system disorders, and certain types of cancers. AIM OF REVIEW This review aimed to explore the diverse roles of ECs and PCs in the formation and reshaping of blood vessels. This review focused on the essential signaling pathways that facilitate communication between these cells and investigated how disruptions in these pathways may contribute to disease. Additionally, the review explored potential therapeutic targets, future research directions, and innovative approaches, such as investigating the impact of EC-PCs in novel systemic diseases, addressing resistance to antiangiogenic drugs, and developing novel antiangiogenic medications to enhance therapeutic efficacy. KEY SCIENTIFIC CONCEPTS OF REVIEW Disordered EC-PC intercellular signaling plays a role in abnormal blood vessel formation, thus contributing to the progression of various diseases and the development of resistance to antiangiogenic drugs. Therefore, studies on EC-PC intercellular interactions have high clinical relevance.
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Affiliation(s)
- Gan Li
- Department of Orthopaedics, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China; Institute of Microsurgery on Extremities, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
| | - Junjie Gao
- Department of Orthopaedics, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China; Institute of Microsurgery on Extremities, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China; Shanghai Sixth People's Hospital Fujian, No. 16, Luoshan Section, Jinguang Road, Luoshan Street, Jinjiang City, Quanzhou, Fujian, China
| | - Peng Ding
- Department of Orthopaedics, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China; Institute of Microsurgery on Extremities, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China.
| | - Youshui Gao
- Department of Orthopaedics, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China; Institute of Microsurgery on Extremities, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China.
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Shen XW, Tang ZY, Shen XJ, Zhao JM. [Role and mechanism of platelet-derived growth factor BB in thrombocytosis in Kawasaki disease]. ZHONGGUO DANG DAI ER KE ZA ZHI = CHINESE JOURNAL OF CONTEMPORARY PEDIATRICS 2023; 25:579-586. [PMID: 37382126 DOI: 10.7499/j.issn.1008-8830.2301086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
OBJECTIVES To study the role and mechanism of platelet-derived growth factor BB (PDGF-BB) on platelet production in Kawasaki disease (KD) mice and human megakaryocytic Dami cells through in vitro and invivo experiments. METHODS ELISA was used to measure the expression of PDGF in the serum of 40 children with KD and 40 healthy children. C57BL/6 mice were used to establish a model of KD and were then randomly divided into a normal group, a KD group, and an imatinib group (30 mice in each group). Routine blood test was performed for each group, and the expression of PDGF-BB, megakaryocyte colony forming unit (CFU-MK), and the megakaryocyte marker CD41 were measured. CCK-8, flow cytometry, quantitative real-time PCR, and Western blot were used to analyze the role and mechanism of PDGF-BB in platelet production in Dami cells. RESULTS PDGF-BB was highly expressed in the serum of KD children (P<0.001). The KD group had a higher expression level of PDGF-BB in serum (P<0.05) and significant increases in the expression of CFU-MK and CD41 (P<0.001), and the imatinib group had significant reductions in the expression of CFU-MK and CD41 (P<0.001). In vitro experiments showed that PDGF-BB promoted Dami cell proliferation, platelet production, mRNA expression of PDGFR-β, and protein expression of p-Akt (P<0.05). Compared with the PDGF-BB group, the combination group (PDGF-BB 25 ng/mL + imatinib 20 μmol/L) had significantly lower levels of platelet production, mRNA expression of PDGFR-β, and protein expression of p-Akt (P<0.05). CONCLUSIONS PDGF-BB may promote megakaryocyte proliferation, differentiation, and platelet production by binding to PDGFR-β and activating the PI3K/Akt pathway, and the PDGFR-β inhibitor imatinib can reduce platelet production, which provides a new strategy for the treatment of thrombocytosis in KD.
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Affiliation(s)
- Xi-Wei Shen
- Department of Pediatrics, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, China
| | | | | | - Jian-Mei Zhao
- Department of Pediatrics, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, China
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3
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Sá da Bandeira D, Kilpatrick AM, Marques M, Gomez-Salazar M, Ventura T, Gonzalez ZN, Stefancova D, Rossi F, Vermeren M, Vink CS, Beltran M, Henderson NC, Jung B, van der Linden R, van de Werken HJG, van Ijcken WFJ, Betsholtz C, Forbes SJ, Cuervo H, Crisan M. PDGFRβ + cells play a dual role as hematopoietic precursors and niche cells during mouse ontogeny. Cell Rep 2022; 40:111114. [PMID: 35858557 PMCID: PMC9638014 DOI: 10.1016/j.celrep.2022.111114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 03/18/2022] [Accepted: 06/28/2022] [Indexed: 11/27/2022] Open
Abstract
Hematopoietic stem cell (HSC) generation in the aorta-gonad-mesonephros region requires HSC specification signals from the surrounding microenvironment. In zebrafish, PDGF-B/PDGFRβ signaling controls hematopoietic stem/progenitor cell (HSPC) generation and is required in the HSC specification niche. Little is known about murine HSPC specification in vivo and whether PDGF-B/PDGFRβ is involved. Here, we show that PDGFRβ is expressed in distinct perivascular stromal cell layers surrounding the mid-gestation dorsal aorta, and its deletion impairs hematopoiesis. We demonstrate that PDGFRβ+ cells play a dual role in murine hematopoiesis. They act in the aortic niche to support HSPCs, and in addition, PDGFRβ+ embryonic precursors give rise to a subset of HSPCs that persist into adulthood. These findings provide crucial information for the controlled production of HSPCs in vitro. PDGFRβ deletion affects hematopoietic development in the AGM in vivo The transcriptome and hematopoietic support of the PDGFRβ-KO niche are altered The osteogenic gene profile and differentiation of KO AGM MSCs are affected PDGFRβ+ early embryonic precursors contribute to EC and HSPC lineages in vivo
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Affiliation(s)
- Diana Sá da Bandeira
- Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, EH16 4TJ Edinburgh, UK; Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Alastair Morris Kilpatrick
- Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Madalena Marques
- Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Mario Gomez-Salazar
- Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Telma Ventura
- Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Zaniah Nashira Gonzalez
- Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, EH16 4TJ Edinburgh, UK; Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Dorota Stefancova
- Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Fiona Rossi
- Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Matthieu Vermeren
- Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Chris Sebastiaan Vink
- Centre for Inflammation Research, Institute for Regeneration and Repair, The Queen's Medical Research Institute, University of Edinburgh, EH16 4TJ Edinburgh, UK
| | - Mariana Beltran
- Centre for Inflammation Research, Institute for Regeneration and Repair, The Queen's Medical Research Institute, University of Edinburgh, EH16 4TJ Edinburgh, UK
| | - Neil Cowan Henderson
- Centre for Inflammation Research, Institute for Regeneration and Repair, The Queen's Medical Research Institute, University of Edinburgh, EH16 4TJ Edinburgh, UK; MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, EH4 2XU Edinburgh, UK
| | - Bongnam Jung
- Department of Immunology, Genetics, and Pathology, Uppsala University, 751 85 Uppsala, Sweden; Harvard Medical School, Department of Surgery, Boston Children's Hospital, Boston, MA 02115, USA
| | - Reinier van der Linden
- Hubrecht Institute, Department van Oudenaarden Quantitative Biology, 3584 Utrecht, the Netherlands
| | - Harmen Jan George van de Werken
- Erasmus MC Cancer Institute, University Medical Center, Cancer Computational Biology Center, and Departments of Urology and Immunology, 3000 Rotterdam, the Netherlands
| | - Wilfred F J van Ijcken
- Center for Biomics, Department of Cell Biology, Erasmus MC University Medical Centre, 3015 Rotterdam, the Netherlands
| | - Christer Betsholtz
- Department of Immunology, Genetics, and Pathology, Uppsala University, 751 85 Uppsala, Sweden; Department of Medicine Huddinge, Karolinska Institutet, 141 57 Huddinge, Sweden
| | - Stuart John Forbes
- Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK
| | - Henar Cuervo
- Department of Physiology and Biophysics, College of Medicine, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Mihaela Crisan
- Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, EH16 4TJ Edinburgh, UK; Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, 5 Little France Drive, EH16 4UU Edinburgh, UK.
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Solinc J, Ribot J, Soubrier F, Pavoine C, Dierick F, Nadaud S. The Platelet-Derived Growth Factor Pathway in Pulmonary Arterial Hypertension: Still an Interesting Target? Life (Basel) 2022; 12:life12050658. [PMID: 35629326 PMCID: PMC9143262 DOI: 10.3390/life12050658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 04/22/2022] [Accepted: 04/25/2022] [Indexed: 12/03/2022] Open
Abstract
The lack of curative options for pulmonary arterial hypertension drives important research to understand the mechanisms underlying this devastating disease. Among the main identified pathways, the platelet-derived growth factor (PDGF) pathway was established to control vascular remodeling and anti-PDGF receptor (PDGFR) drugs were shown to reverse the disease in experimental models. Four different isoforms of PDGF are produced by various cell types in the lung. PDGFs control vascular cells migration, proliferation and survival through binding to their receptors PDGFRα and β. They elicit multiple intracellular signaling pathways which have been particularly studied in pulmonary smooth muscle cells. Activation of the PDGF pathway has been demonstrated both in patients and in pulmonary hypertension (PH) experimental models. Tyrosine kinase inhibitors (TKI) are numerous but without real specificity and Imatinib, one of the most specific, resulted in beneficial effects. However, adverse events and treatment discontinuation discouraged to pursue this therapy. Novel therapeutic strategies are currently under experimental evaluation. For TKI, they include intratracheal drug administration, low dosage or nanoparticles delivery. Specific anti-PDGF and anti-PDGFR molecules can also be designed such as new TKI, soluble receptors, aptamers or oligonucleotides.
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Affiliation(s)
- Julien Solinc
- INSERM, Institute of Cardiometabolism and Nutrition (ICAN), Sorbonne Université, UMR_S1166, F-75013 Paris, France; (J.S.); (J.R.); (F.S.); (C.P.)
| | - Jonathan Ribot
- INSERM, Institute of Cardiometabolism and Nutrition (ICAN), Sorbonne Université, UMR_S1166, F-75013 Paris, France; (J.S.); (J.R.); (F.S.); (C.P.)
| | - Florent Soubrier
- INSERM, Institute of Cardiometabolism and Nutrition (ICAN), Sorbonne Université, UMR_S1166, F-75013 Paris, France; (J.S.); (J.R.); (F.S.); (C.P.)
| | - Catherine Pavoine
- INSERM, Institute of Cardiometabolism and Nutrition (ICAN), Sorbonne Université, UMR_S1166, F-75013 Paris, France; (J.S.); (J.R.); (F.S.); (C.P.)
| | - France Dierick
- Lady Davis Institute for Medical Research, McGill University, Montreal, QC H3T 1E2, Canada;
| | - Sophie Nadaud
- INSERM, Institute of Cardiometabolism and Nutrition (ICAN), Sorbonne Université, UMR_S1166, F-75013 Paris, France; (J.S.); (J.R.); (F.S.); (C.P.)
- Correspondence: ; Tel.: +33-14077-9681
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5
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Mohamad SF, Gunawan A, Blosser R, Childress P, Aguilar-Perez A, Ghosh J, Hong JM, Liu J, Kanagasabapathy D, Kacena MA, Srour EF, Bruzzaniti A. Neonatal Osteomacs and Bone Marrow Macrophages Differ in Phenotypic Marker Expression and Function. J Bone Miner Res 2021; 36:1580-1593. [PMID: 33900648 DOI: 10.1002/jbmr.4314] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 04/13/2021] [Accepted: 04/17/2021] [Indexed: 01/27/2023]
Abstract
Osteomacs (OM) are specialized bone-resident macrophages that are a component of the hematopoietic niche and support bone formation. Also located in the niche are a second subset of macrophages, namely bone marrow-derived macrophages (BM Mφ). We previously reported that a subpopulation of OM co-express both CD166 and CSF1R, the receptor for macrophage colony-stimulating factor (MCSF), and that OM form more bone-resorbing osteoclasts than BM Mφ. Reported here are single-cell quantitative RT-PCR (qRT-PCR), mass cytometry (CyTOF), and marker-specific functional studies that further identify differences between OM and BM Mφ from neonatal C57Bl/6 mice. Although OM express higher levels of CSF1R and MCSF, they do not respond to MCSF-induced proliferation, in contrast to BM Mφ. Moreover, receptor activator of NF-κB ligand (RANKL), without the addition of MCSF, was sufficient to induce osteoclast formation in OM but not BM Mφ cultures. OM express higher levels of CD166 than BM Mφ, and we found that osteoclast formation by CD166-/- OM was reduced compared with wild-type (WT) OM, whereas CD166-/- BM Mφ showed enhanced osteoclast formation. CD110/c-Mpl, the receptor for thrombopoietin (TPO), was also higher in OM, but TPO did not alter OM-derived osteoclast formation, whereas TPO stimulated BM Mφ osteoclast formation. CyTOF analyses demonstrated OM uniquely co-express CD86 and CD206, markers of M1 and M2 polarized macrophages, respectively. OM performed equivalent phagocytosis in response to LPS or IL-4/IL-10, which induce polarization to M1 and M2 subtypes, respectively, whereas BM Mφ were less competent at phagocytosis when polarized to the M2 subtype. Moreover, in contrast to BM Mφ, LPS treatment of OM led to the upregulation of CD80, an M1 marker, as well as IL-10 and IL-6, known anti-inflammatory cytokines. Overall, these data reveal that OM and BM Mφ are distinct subgroups of macrophages, whose phenotypic and functional differences in proliferation, phagocytosis, and osteoclast formation may contribute physiological specificity during health and disease. © 2021 American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Safa F Mohamad
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Andrea Gunawan
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Rachel Blosser
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Paul Childress
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Alexandra Aguilar-Perez
- Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry, Indianapolis, IN, USA
| | - Joydeep Ghosh
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Jung Min Hong
- Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry, Indianapolis, IN, USA
| | - Jianyun Liu
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Deepa Kanagasabapathy
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Melissa A Kacena
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Edward F Srour
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Angela Bruzzaniti
- Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry, Indianapolis, IN, USA
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Tillie RJHA, Theelen TL, van Kuijk K, Temmerman L, de Bruijn J, Gijbels M, Betsholtz C, Biessen EAL, Sluimer JC. A Switch from Cell-Associated to Soluble PDGF-B Protects against Atherosclerosis, despite Driving Extramedullary Hematopoiesis. Cells 2021; 10:1746. [PMID: 34359916 PMCID: PMC8308020 DOI: 10.3390/cells10071746] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 07/07/2021] [Accepted: 07/08/2021] [Indexed: 12/30/2022] Open
Abstract
Platelet-derived growth factor B (PDGF-B) is a mitogenic, migratory and survival factor. Cell-associated PDGF-B recruits stabilizing pericytes towards blood vessels through retention in extracellular matrix. We hypothesized that the genetic ablation of cell-associated PDGF-B by retention motif deletion would reduce the local availability of PDGF-B, resulting in microvascular pericyte loss, microvascular permeability and exacerbated atherosclerosis. Therefore, Ldlr-/-Pdgfbret/ret mice were fed a high cholesterol diet. Although plaque size was increased in the aortic root of Pdgfbret/ret mice, microvessel density and intraplaque hemorrhage were unexpectedly unaffected. Plaque macrophage content was reduced, which is likely attributable to increased apoptosis, as judged by increased TUNEL+ cells in Pdgfbret/ret plaques (2.1-fold) and increased Pdgfbret/ret macrophage apoptosis upon 7-ketocholesterol or oxidized LDL incubation in vitro. Moreover, Pdgfbret/ret plaque collagen content increased independent of mesenchymal cell density. The decreased macrophage matrix metalloproteinase activity could partly explain Pdgfbret/ret collagen content. In addition to the beneficial vascular effects, we observed reduced body weight gain related to smaller fat deposition in Pdgfbret/ret liver and adipose tissue. While dampening plaque inflammation, Pdgfbret/ret paradoxically induced systemic leukocytosis. The increased incorporation of 5-ethynyl-2'-deoxyuridine indicated increased extramedullary hematopoiesis and the increased proliferation of circulating leukocytes. We concluded that Pdgfbret/ret confers vascular and metabolic effects, which appeared to be protective against diet-induced cardiovascular burden. These effects were unrelated to arterial mesenchymal cell content or adventitial microvessel density and leakage. In contrast, the deletion drives splenic hematopoiesis and subsequent leukocytosis in hypercholesterolemia.
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Affiliation(s)
- Renée J. H. A. Tillie
- Department of Pathology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands; (R.J.H.A.T.); (T.L.T.); (K.v.K.); (L.T.); (J.d.B.); (M.G.); (E.A.L.B.)
| | - Thomas L. Theelen
- Department of Pathology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands; (R.J.H.A.T.); (T.L.T.); (K.v.K.); (L.T.); (J.d.B.); (M.G.); (E.A.L.B.)
| | - Kim van Kuijk
- Department of Pathology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands; (R.J.H.A.T.); (T.L.T.); (K.v.K.); (L.T.); (J.d.B.); (M.G.); (E.A.L.B.)
| | - Lieve Temmerman
- Department of Pathology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands; (R.J.H.A.T.); (T.L.T.); (K.v.K.); (L.T.); (J.d.B.); (M.G.); (E.A.L.B.)
| | - Jenny de Bruijn
- Department of Pathology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands; (R.J.H.A.T.); (T.L.T.); (K.v.K.); (L.T.); (J.d.B.); (M.G.); (E.A.L.B.)
| | - Marion Gijbels
- Department of Pathology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands; (R.J.H.A.T.); (T.L.T.); (K.v.K.); (L.T.); (J.d.B.); (M.G.); (E.A.L.B.)
- Department of Pathology, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands
- Department of Medical Biochemistry, Experimental Vascular Biology, Amsterdam UMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
| | - Christer Betsholtz
- Rudbeck Laboratory, Department of Immunology, Genetics and Pathology, Uppsala University, 751 85 Uppsala, Sweden;
| | - Erik A. L. Biessen
- Department of Pathology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands; (R.J.H.A.T.); (T.L.T.); (K.v.K.); (L.T.); (J.d.B.); (M.G.); (E.A.L.B.)
- Institute for Molecular Cardiovascular Research (IMCAR), RWTH Aachen University, 52074 Aachen, Germany
| | - Judith C. Sluimer
- Department of Pathology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands; (R.J.H.A.T.); (T.L.T.); (K.v.K.); (L.T.); (J.d.B.); (M.G.); (E.A.L.B.)
- BHF Centre for Cardiovascular Sciences (CVS), University of Edinburgh, Edinburgh EH16 4TJ, UK
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Lee LL, Khakoo AY, Chintalgattu V. Cardiac pericytes function as key vasoactive cells to regulate homeostasis and disease. FEBS Open Bio 2020; 11:207-225. [PMID: 33135334 PMCID: PMC7780101 DOI: 10.1002/2211-5463.13021] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 08/24/2020] [Accepted: 10/30/2020] [Indexed: 01/13/2023] Open
Abstract
Pericytes (PCs)—mural cells that envelop endothelial cells (ECs) of microvessels—regulate tissue‐specific vasculature development as well as maturation and maintenance of endothelial barrier integrity. However, little is known about their tissue‐specific function in the heart. Specifically, the mechanism by which cardiac PCs constrict coronary capillaries remains undetermined. To gain insights into the function of cardiac PCs at the cellular level, we isolated NG2+ PDGFRβ+ CD146+ CD34− CD31− CD45− PCs for detailed characterization. Functionally, we provide evidence that these PCs increased transepithelial electrical resistance and decreased endothelial permeability. We show for the first time that this population of PCs express contractile proteins, are stimulated by adrenergic signaling, and demonstrate stereotypical contraction and relaxation. Furthermore, we also studied for the first time, the PCs in in vitro models of disease. PCs in hypoxia activated the hypoxia‐inducible factor 1 alpha pathway, increased secretion of angiogenic factors, and caused cellular apoptosis. Supraphysiological levels of low‐density lipoprotein decreased PC proliferation and induced lipid droplet accumulation. Elevated glucose levels triggered a proinflammatory response. Taken together, our study characterizes cardiac PCs under in vitro disease conditions and supports the hypothesis that cardiac PCs are key vasoactive cells that can regulate blood flow in the heart.
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Affiliation(s)
- Linda L Lee
- Department of Cardiometabolic Disorders, Amgen Research and Discovery, Amgen Inc., South San Francisco, CA, USA
| | - Aarif Y Khakoo
- Department of Drug Development, Calico Labs, South San Francisco, CA, USA
| | - Vishnu Chintalgattu
- Department of Cardiometabolic Disorders, Amgen Research and Discovery, Amgen Inc., South San Francisco, CA, USA
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Zhang Y, Cedervall J, Hamidi A, Herre M, Viitaniemi K, D'Amico G, Miao Z, Unnithan RVM, Vaccaro A, van Hooren L, Georganaki M, Thulin Å, Qiao Q, Andrae J, Siegbahn A, Heldin CH, Alitalo K, Betsholtz C, Dimberg A, Olsson AK. Platelet-Specific PDGFB Ablation Impairs Tumor Vessel Integrity and Promotes Metastasis. Cancer Res 2020; 80:3345-3358. [PMID: 32586981 DOI: 10.1158/0008-5472.can-19-3533] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 04/24/2020] [Accepted: 06/17/2020] [Indexed: 11/16/2022]
Abstract
Platelet-derived growth factor B (PDGFB) plays a crucial role in recruitment of PDGF receptor β-positive pericytes to blood vessels. The endothelium is an essential source of PDGFB in this process. Platelets constitute a major reservoir of PDGFB and are continuously activated in the tumor microenvironment, exposing tumors to the plethora of growth factors contained in platelet granules. Here, we show that tumor vascular function, as well as pericyte coverage is significantly impaired in mice with conditional knockout of PDGFB in platelets. A lack of PDGFB in platelets led to enhanced hypoxia and epithelial-to-mesenchymal transition in the primary tumors, elevated levels of circulating tumor cells, and increased spontaneous metastasis to the liver or lungs in two mouse models. These findings establish a previously unknown role for platelet-derived PDGFB, whereby it promotes and maintains vascular integrity in the tumor microenvironment by contributing to the recruitment of pericytes. SIGNIFICANCE: Conditional knockout of PDGFB in platelets demonstrates its previously unknown role in the maintenance of tumor vascular integrity and host protection against metastasis.
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Affiliation(s)
- Yanyu Zhang
- Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala University, Biomedical Center, Uppsala, Sweden
| | - Jessica Cedervall
- Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala University, Biomedical Center, Uppsala, Sweden
| | - Anahita Hamidi
- Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala University, Biomedical Center, Uppsala, Sweden
| | - Melanie Herre
- Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala University, Biomedical Center, Uppsala, Sweden
| | - Kati Viitaniemi
- Wihuri Research Institute and Translational Cancer Medicine Research Program, Biomedicum Helsinki, 00014 University of Helsinki, Yliopistonkatu, Helsinki, Finland
| | - Gabriela D'Amico
- Wihuri Research Institute and Translational Cancer Medicine Research Program, Biomedicum Helsinki, 00014 University of Helsinki, Yliopistonkatu, Helsinki, Finland
| | - Zuoxiu Miao
- Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala University, Biomedical Center, Uppsala, Sweden
| | - Ragaseema Valsala Madhavan Unnithan
- Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala University, Biomedical Center, Uppsala, Sweden.,Department of Biotechnology, Govt. Arts College, Thiruvananthapuram, India
| | - Alessandra Vaccaro
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, Uppsala, Sweden
| | - Luuk van Hooren
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, Uppsala, Sweden
| | - Maria Georganaki
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, Uppsala, Sweden
| | - Åsa Thulin
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Qi Qiao
- Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala University, Biomedical Center, Uppsala, Sweden
| | - Johanna Andrae
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, Uppsala, Sweden
| | - Agneta Siegbahn
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Carl-Henrik Heldin
- Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala University, Biomedical Center, Uppsala, Sweden
| | - Kari Alitalo
- Wihuri Research Institute and Translational Cancer Medicine Research Program, Biomedicum Helsinki, 00014 University of Helsinki, Yliopistonkatu, Helsinki, Finland
| | - Christer Betsholtz
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, Uppsala, Sweden.,ICMC (Integrated Cardio Metabolic Centre), Karolinska Institutet, Novum, Blickagången 6, Huddinge, Sweden
| | - Anna Dimberg
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, Uppsala, Sweden
| | - Anna-Karin Olsson
- Department of Medical Biochemistry and Microbiology, Science for Life Laboratory, Uppsala University, Biomedical Center, Uppsala, Sweden.
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9
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Mekonnen YA, Gültas M, Effa K, Hanotte O, Schmitt AO. Identification of Candidate Signature Genes and Key Regulators Associated With Trypanotolerance in the Sheko Breed. Front Genet 2019; 10:1095. [PMID: 31803229 PMCID: PMC6872528 DOI: 10.3389/fgene.2019.01095] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Accepted: 10/11/2019] [Indexed: 12/23/2022] Open
Abstract
African animal trypanosomiasis (AAT) is caused by a protozoan parasite that affects the health of livestock. Livestock production in Ethiopia is severely hampered by AAT and various controlling measures were not successful to eradicate the disease. AAT affects the indigenous breeds in varying degrees. However, the Sheko breed shows better trypanotolerance than other breeds. The tolerance attributes of Sheko are believed to be associated with its taurine genetic background but the genetic controls of these tolerance attributes of Sheko are not well understood. In order to investigate the level of taurine background in the genome, we compare the genome of Sheko with that of 11 other African breeds. We find that Sheko has an admixed genome composed of taurine and indicine ancestries. We apply three methods: (i) The integrated haplotype score (iHS), (ii) the standardized log ratio of integrated site specific extended haplotype homozygosity between populations (Rsb), and (iii) the composite likelihood ratio (CLR) method to discover selective sweeps in the Sheko genome. We identify 99 genomic regions harboring 364 signature genes in Sheko. Out of the signature genes, 15 genes are selected based on their biological importance described in the literature. We also identify 13 overrepresented pathways and 10 master regulators in Sheko using the TRANSPATH database in the geneXplain platform. Most of the pathways are related with oxidative stress responses indicating a possible selection response against the induction of oxidative stress following trypanosomiasis infection in Sheko. Furthermore, we present for the first time the importance of master regulators involved in trypanotolerance not only for the Sheko breed but also in the context of cattle genomics. Our finding shows that the master regulator Caspase is a key protease which plays a major role for the emergence of adaptive immunity in harmony with the other master regulators. These results suggest that designing and implementing genetic intervention strategies is necessary to improve the performance of susceptible animals. Moreover, the master regulatory analysis suggests potential candidate therapeutic targets for the development of new drugs for trypanosomiasis treatment.
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Affiliation(s)
- Yonatan Ayalew Mekonnen
- Breeding Informatics Group, Department of Animal Sciences, University of Göttingen, Göttingen, Germany
| | - Mehmet Gültas
- Breeding Informatics Group, Department of Animal Sciences, University of Göttingen, Göttingen, Germany.,Center for Integrated Breeding Research (CiBreed), University of Göttingen, Göttingen, Germany
| | - Kefena Effa
- Animal Biosciences, National Program Coordinator for African Dairy Genetic Gain, International Livestock Research Institute (ILRI), Addis Ababa, Ethiopia
| | - Olivier Hanotte
- Cells, Organisms amd Molecular Genetics, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom.,LiveGene, International Livestock Research Institute (ILRI), Addis Ababa, Ethiopia
| | - Armin O Schmitt
- Breeding Informatics Group, Department of Animal Sciences, University of Göttingen, Göttingen, Germany.,Center for Integrated Breeding Research (CiBreed), University of Göttingen, Göttingen, Germany
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10
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Hematopoietic stem cell response to acute thrombocytopenia requires signaling through distinct receptor tyrosine kinases. Blood 2019; 134:1046-1058. [PMID: 31434705 DOI: 10.1182/blood.2019000721] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 08/14/2019] [Indexed: 12/13/2022] Open
Abstract
Although bone marrow niche cells are essential for hematopoietic stem cell (HSC) maintenance, their interaction in response to stress is not well defined. Here, we used a mouse model of acute thrombocytopenia to investigate the cross talk between HSCs and niche cells during restoration of the thrombocyte pool. This process required membrane-localized stem cell factor (m-SCF) in megakaryocytes, which was regulated, in turn, by vascular endothelial growth factor A (VEGF-A) and platelet-derived growth factor-BB (PDGF-BB). HSCs and multipotent progenitors type 2 (MPP2), but not MPP3/4, were subsequently activated by a dual-receptor tyrosine kinase (RTK)-dependent signaling event, m-SCF/c-Kit and VEGF-A/vascular endothelial growth factor receptor 2 (VEGFR-2), contributing to their selective and early proliferation. Our findings describe a dynamic network of signals in response to the acute loss of a single blood cell type and reveal the important role of 3 RTKs and their ligands in orchestrating the selective activation of hematopoietic stem and progenitor cells (HSPCs) in thrombocytopenia.
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11
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Lee LL, Chintalgattu V. Pericytes in the Heart. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1122:187-210. [PMID: 30937870 DOI: 10.1007/978-3-030-11093-2_11] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Mural cells known as pericytes envelop the endothelial layer of microvessels throughout the body and have been described to have tissue-specific functions. Cardiac pericytes are abundantly found in the heart, but they are relatively understudied. Currently, their importance is emerging in cardiovascular homeostasis and dysfunction due to their pleiotropism. They are known to play key roles in vascular tone and vascular integrity as well as angiogenesis. However, their dysfunctional presence and/or absence is critical in the mechanisms that lead to cardiac pathologies such as myocardial infarction, fibrosis, and thrombosis. Moreover, they are targeted as a therapeutic potential due to their mesenchymal properties that could allow them to repair and regenerate a damaged heart. They are also sought after as a cell-based therapy based on their healing potential in preclinical studies of animal models of myocardial infarction. Therefore, recognizing the importance of cardiac pericytes and understanding their biology will lead to new therapeutic concepts.
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Affiliation(s)
- Linda L Lee
- Department of CardioMetabolic Disorders, Amgen Research and Discovery, Amgen Inc., South San Francisco, CA, USA
| | - Vishnu Chintalgattu
- Department of CardioMetabolic Disorders, Amgen Research and Discovery, Amgen Inc., South San Francisco, CA, USA.
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12
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Fuchs T, Hahn M, Ries L, Giesler S, Busch S, Wang C, Han J, Schulze TJ, Puellmann K, Beham AW, Kaminski WE, Neumaier M. Expression of combinatorial immunoglobulins in macrophages in the tumor microenvironment. PLoS One 2018; 13:e0204108. [PMID: 30240437 PMCID: PMC6150476 DOI: 10.1371/journal.pone.0204108] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 09/04/2018] [Indexed: 02/06/2023] Open
Abstract
Recent evidence indicates the presence of macrophage subpopulations that express the TCRαβ in chronic inflammatory diseases such as tuberculosis and atherosclerosis and in the tumor microenvironment. Here, we demonstrate that a second subpopulation of macrophages expresses rearranged heavy and light chain immunoglobulins. We identify immunoglobulin expression in human and murine monocytes, in ex vivo differentiated macrophages and macrophages from the tumor microenvironment of five randomly selected distinct human tumor entities. The immunoglobulin heavy and light chains are expressed in a small macrophage subfraction (~3-5%) as combinatorial and individual-specific immune receptors. Using Sanger sequencing and deep sequencing, we routinely find markedly restricted Ig repertoires in monocytes/macrophages compared to normal B cells. Furthermore, we report the complete Ig heavy and light chain sequences of a fully functional immunoglobulin from a single tumor-associated macrophage. These results demonstrate that Ig expression is a defining feature of monocytes and also macrophages in the tumor microenvironment and thus reveal an as yet unrecognized modus operandi of host defense in professional phagocytes.
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Affiliation(s)
- Tina Fuchs
- Institute for Clinical Chemistry, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Martin Hahn
- Institute for Clinical Chemistry, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Lukas Ries
- Institute for Clinical Chemistry, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Sophie Giesler
- Institute for Clinical Chemistry, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Svenja Busch
- Institute for Clinical Chemistry, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Chunlin Wang
- iRepertoire inc. Huntsville, AL, United States of America
| | - Jian Han
- iRepertoire inc. Huntsville, AL, United States of America
- HudsonAlpha Institute for Biotechnology, Huntsville, AL, United States of America
| | - Torsten J. Schulze
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | | | | | - Wolfgang E. Kaminski
- Institute for Clinical Chemistry, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
- Bioscientia Institute for Medical Diagnostics, Ingelheim, Germany
| | - Michael Neumaier
- Institute for Clinical Chemistry, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
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13
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Xu J, Xie L, Guo W. PDGF/PDGFR effects in osteosarcoma and the "add-on" strategy. Clin Sarcoma Res 2018; 8:15. [PMID: 30083310 PMCID: PMC6071404 DOI: 10.1186/s13569-018-0102-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 06/18/2018] [Indexed: 01/12/2023] Open
Abstract
New treatment options for advanced osteosarcoma have remained limited. The platelet-derived growth factor (PDGF)/platelet-derived growth factor receptor (PDGFR) pathway plays an important role in the development and metastasis of osteosarcoma, via either direct autocrine stimulation of tumor cells, or paracrine stimulation on tumor stromal cells. It promotes angiogenesis to overcome hypoxia in the tumor microenvironment, and modulates tumor interstitial fluid pressure to control the influx and efflux of other agents. Targeting the PDGF/PDGFR pathway is a promising therapeutic method to overcome drug resistance and improve patients' outcome in osteosarcoma. Further evidence is needed to define the detailed mechanism. Results from clinical trials using PDGF/PDGFR inhibitor as a single agent were disappointing, both in osteosarcoma and soft tissue sarcoma. However, when combined with other agents, named as "add-on" strategy, a synergistic antitumor effect has been confirmed in soft tissue sarcoma, and should be attempted in osteosarcoma.
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Affiliation(s)
- Jie Xu
- Peking University People's Hospital, Beijing, 100044 China
| | - Lu Xie
- Peking University People's Hospital, Beijing, 100044 China
| | - Wei Guo
- Peking University People's Hospital, Beijing, 100044 China
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14
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Erickson MA, Banks WA. Neuroimmune Axes of the Blood-Brain Barriers and Blood-Brain Interfaces: Bases for Physiological Regulation, Disease States, and Pharmacological Interventions. Pharmacol Rev 2018; 70:278-314. [PMID: 29496890 PMCID: PMC5833009 DOI: 10.1124/pr.117.014647] [Citation(s) in RCA: 198] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Central nervous system (CNS) barriers predominantly mediate the immune-privileged status of the brain, and are also important regulators of neuroimmune communication. It is increasingly appreciated that communication between the brain and immune system contributes to physiologic processes, adaptive responses, and disease states. In this review, we discuss the highly specialized features of brain barriers that regulate neuroimmune communication in health and disease. In section I, we discuss the concept of immune privilege, provide working definitions of brain barriers, and outline the historical work that contributed to the understanding of CNS barrier functions. In section II, we discuss the unique anatomic, cellular, and molecular characteristics of the vascular blood-brain barrier (BBB), blood-cerebrospinal fluid barrier, and tanycytic barriers that confer their functions as neuroimmune interfaces. In section III, we consider BBB-mediated neuroimmune functions and interactions categorized as five neuroimmune axes: disruption, responses to immune stimuli, uptake and transport of immunoactive substances, immune cell trafficking, and secretions of immunoactive substances. In section IV, we discuss neuroimmune functions of CNS barriers in physiologic and disease states, as well as pharmacological interventions for CNS diseases. Throughout this review, we highlight many recent advances that have contributed to the modern understanding of CNS barriers and their interface functions.
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Affiliation(s)
- Michelle A Erickson
- Geriatric Research and Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington; and Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, Washington
| | - William A Banks
- Geriatric Research and Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington; and Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, Washington
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15
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Onwuka E, Best C, Sawyer A, Yi T, Heuer E, Sams M, Wiet M, Zheng H, Kyriakides T, Breuer C. The role of myeloid cell-derived PDGF-B in neotissue formation in a tissue-engineered vascular graft. Regen Med 2017; 12:249-261. [PMID: 28524773 DOI: 10.2217/rme-2016-0141] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
AIM Inflammatory myeloid lineage cells mediate neotissue formation in tissue-engineered vascular grafts, but the molecular mechanism is not completely understood. We examined the role of vasculogenic PDGF-B in tissue-engineered vascular graft neotissue development. MATERIALS & METHODS Myeloid cell-specific PDGF-B knockout mice (PDGF-KO) were generated using bone marrow transplantation, and scaffolds were implanted as inferior vena cava interposition grafts in either PDGF-KO or wild-type mice. RESULTS After 2 weeks, grafts from PDGF-KO mice had more remaining scaffold polymer and less intimal neotissue development. Increased macrophage apoptosis, decreased smooth muscle cell proliferation and decreased collagen content was also observed. CONCLUSION Myeloid cell-derived PDGF contributes to vascular neotissue formation by regulating macrophage apoptosis, smooth muscle cell proliferation and extracellular matrix deposition.
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Affiliation(s)
- Ekene Onwuka
- Tissue Engineering & Surgical Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA.,Department of Surgery, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Cameron Best
- Tissue Engineering & Surgical Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Andrew Sawyer
- Vascular Biology & Therapeutics, Yale School of Medicine, New Haven, CT, USA.,Department of Pathology, Yale School of Medicine, New Haven, CT, USA
| | - Tai Yi
- Tissue Engineering & Surgical Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Eric Heuer
- Tissue Engineering & Surgical Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Malik Sams
- Tissue Engineering & Surgical Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Matthew Wiet
- Tissue Engineering & Surgical Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Hong Zheng
- Tissue Engineering & Surgical Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Themis Kyriakides
- Vascular Biology & Therapeutics, Yale School of Medicine, New Haven, CT, USA.,Department of Pathology, Yale School of Medicine, New Haven, CT, USA
| | - Christopher Breuer
- Tissue Engineering & Surgical Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA.,Department of Surgery, The Ohio State University Wexner Medical Center, Columbus, OH, USA.,Department of Pediatric Surgery, Nationwide Children's Hospital, Columbus, OH, USA
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16
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Nelson KN, Peiris MN, Meyer AN, Siari A, Donoghue DJ. Receptor Tyrosine Kinases: Translocation Partners in Hematopoietic Disorders. Trends Mol Med 2016; 23:59-79. [PMID: 27988109 DOI: 10.1016/j.molmed.2016.11.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 11/11/2016] [Accepted: 11/13/2016] [Indexed: 02/07/2023]
Abstract
Receptor tyrosine kinases (RTKs) activate various signaling pathways and regulate cellular proliferation, survival, migration, and angiogenesis. Malignant neoplasms often circumvent or subjugate these pathways by promoting RTK overactivation through mutation or chromosomal translocation. RTK translocations create a fusion protein containing a dimerizing partner fused to an RTK kinase domain, resulting in constitutive kinase domain activation, altered RTK cellular localization, upregulation of downstream signaling, and novel pathway activation. While RTK translocations in hematological malignancies are relatively rare, clinical evidence suggests that patients with these genetic abnormalities benefit from RTK-targeted inhibitors. Here, we present a timely review of an exciting field by examining RTK chromosomal translocations in hematological cancers, such as Anaplastic Lymphoma Kinase (ALK), Fibroblast Growth Factor Receptor (FGFR), Platelet-Derived Growth Factor Receptor (PDGFR), REarranged during Transfection (RET), Colony Stimulating Factor 1 Receptor (CSF1R), and Neurotrophic Tyrosine Kinase Receptor Type 3 (NTRK3) fusions, and discuss current therapeutic options.
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Affiliation(s)
- Katelyn N Nelson
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
| | - Malalage N Peiris
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
| | - April N Meyer
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
| | - Asma Siari
- Université Joseph Fourier Grenoble, Grenoble, France
| | - Daniel J Donoghue
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA; Moores UCSD Cancer Center, University of California San Diego, La Jolla, CA 92093, USA.
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17
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Lim SE, Esain V, Kwan W, Theodore LN, Cortes M, Frost IM, Liu SY, North TE. HIF1α-induced PDGFRβ signaling promotes developmental HSC production via IL-6 activation. Exp Hematol 2016; 46:83-95.e6. [PMID: 27751871 DOI: 10.1016/j.exphem.2016.10.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 10/01/2016] [Indexed: 12/15/2022]
Abstract
Hematopoietic stem cells (HSCs) have the ability to both self-renew and differentiate each of the mature blood cell lineages and thereby reconstitute the entire blood system. Therefore, HSCs are therapeutically valuable for treatment of hematological malignances and bone marrow failure. We showed recently that transient glucose elevation elicited dose-dependent effects on HSCs through elevated metabolic activity and subsequent reactive oxygen species-mediated induction of Hypoxia-Inducible Factor 1α (Hif1α). Platelet-Derived Growth Factor B (pdgfb), a Hif1α-target, and its receptor, pdgfrb, were significantly upregulated in response to metabolic stimulation. Although the function of PDGF signaling is well established in vascular development, its role in hematopoiesis is less understood. Exposure to either a pan-PDGF inhibitor or a PDGFRβ-selective antagonist in the context of Hif1α stimulation blocked elevations in hematopoietic stem and progenitor cell (HSPC) formation as determined by runx1;cmyb whole-mount in situ hybridization (WISH) and HSPC-reporter flow cytometry analysis. Similar results were observed for morpholino (MO) knockdown of pdgfrb or dominant-negative pdgfrb expression, indicating that PDGFRβ signaling is a key downstream mediator of Hif1α-mediated induction of HSPCs. Notably, overexpression of Pdgfb ligand enhanced HSPC numbers in the aorta-gonado-mesonephros (AGM) at 36 hours postfertilization (hpf) and in the caudal hematopoietic tissue at 48 hpf. A survey of known PDGF-B/PDGFRβ regulatory targets by expression analysis revealed a significant increase in inflammatory intermediates, including Interleukin 6 (IL-6) and its receptor (IL-6R). MO-mediated knockdown of il6 or chemical inhibition of IL-6R antagonized the effect of Pdgfb overexpression. Furthermore, epistatic analysis of IL-6/IL-6R function confirmed activity downstream of Hif1α. Together, these findings define a Hif1α-regulated signaling axis mediated through PBFGB/PDGFRβ and IL-6/IL-6R that acts to control embryonic HSPC production.
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Affiliation(s)
- Sung-Eun Lim
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Virginie Esain
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Wanda Kwan
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Lindsay N Theodore
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Mauricio Cortes
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Isaura M Frost
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Sarah Y Liu
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Trista E North
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA; Harvard Stem Cell Institute, Cambridge, Massachusetts, USA.
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18
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Ratheesh A, Belyaeva V, Siekhaus DE. Drosophila immune cell migration and adhesion during embryonic development and larval immune responses. Curr Opin Cell Biol 2015. [PMID: 26210104 DOI: 10.1016/j.ceb.2015.07.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The majority of immune cells in Drosophila melanogaster are plasmatocytes; they carry out similar functions to vertebrate macrophages, influencing development as well as protecting against infection and cancer. Plasmatocytes, sometimes referred to with the broader term of hemocytes, migrate widely during embryonic development and cycle in the larvae between sessile and circulating positions. Here we discuss the similarities of plasmatocyte developmental migration and its functions to that of vertebrate macrophages, considering the recent controversy regarding the functions of Drosophila PDGF/VEGF related ligands. We also examine recent findings on the significance of adhesion for plasmatocyte migration in the embryo, as well as proliferation, trans-differentiation, and tumor responses in the larva. We spotlight parallels throughout to vertebrate immune responses.
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Affiliation(s)
| | - Vera Belyaeva
- IST Austria, Am Campus 1, 3400 Klosterneuburg, Austria
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19
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Noskovičová N, Petřek M, Eickelberg O, Heinzelmann K. Platelet-Derived Growth Factor Signaling in the Lung. From Lung Development and Disease to Clinical Studies. Am J Respir Cell Mol Biol 2015; 52:263-84. [DOI: 10.1165/rcmb.2014-0294tr] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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20
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Eisinger BE, Driessen TM, Zhao C, Gammie SC. Medial prefrontal cortex: genes linked to bipolar disorder and schizophrenia have altered expression in the highly social maternal phenotype. Front Behav Neurosci 2014; 8:110. [PMID: 24765068 PMCID: PMC3980118 DOI: 10.3389/fnbeh.2014.00110] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 03/15/2014] [Indexed: 11/14/2022] Open
Abstract
The transition to motherhood involves CNS changes that modify sociability and affective state. However, these changes also put females at risk for post-partum depression and psychosis, which impairs parenting abilities and adversely affects children. Thus, changes in expression and interactions in a core subset of genes may be critical for emergence of a healthy maternal phenotype, but inappropriate changes of the same genes could put women at risk for post-partum disorders. This study evaluated microarray gene expression changes in medial prefrontal cortex (mPFC), a region implicated in both maternal behavior and psychiatric disorders. Post-partum mice were compared to virgin controls housed with females and isolated for identical durations. Using the Modular Single-set Enrichment Test (MSET), we found that the genetic landscape of maternal mPFC bears statistical similarity to gene databases associated with schizophrenia (5 of 5 sets) and bipolar disorder (BPD, 3 of 3 sets). In contrast to previous studies of maternal lateral septum (LS) and medial preoptic area (MPOA), enrichment of autism and depression-linked genes was not significant (2 of 9 sets, 0 of 4 sets). Among genes linked to multiple disorders were fatty acid binding protein 7 (Fabp7), glutamate metabotropic receptor 3 (Grm3), platelet derived growth factor, beta polypeptide (Pdgfrb), and nuclear receptor subfamily 1, group D, member 1 (Nr1d1). RT-qPCR confirmed these gene changes as well as FMS-like tyrosine kinase 1 (Flt1) and proenkephalin (Penk). Systems-level methods revealed involvement of developmental gene networks in establishing the maternal phenotype and indirectly suggested a role for numerous microRNAs and transcription factors in mediating expression changes. Together, this study suggests that a subset of genes involved in shaping the healthy maternal brain may also be dysregulated in mental health disorders and put females at risk for post-partum psychosis with aspects of schizophrenia and BPD.
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Affiliation(s)
- Brian E Eisinger
- Department of Zoology, University of Wisconsin-Madison Madison, WI, USA
| | - Terri M Driessen
- Department of Zoology, University of Wisconsin-Madison Madison, WI, USA
| | - Changjiu Zhao
- Department of Zoology, University of Wisconsin-Madison Madison, WI, USA
| | - Stephen C Gammie
- Department of Zoology, University of Wisconsin-Madison Madison, WI, USA ; Neuroscience Training Program, University of Wisconsin-Madison Madison, WI, USA
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21
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Chen W, Guo Y, Walker EJ, Shen F, Jun K, Oh SP, Degos V, Lawton MT, Tihan T, Davalos D, Akassoglou K, Nelson J, Pile-Spellman J, Su H, Young WL. Reduced mural cell coverage and impaired vessel integrity after angiogenic stimulation in the Alk1-deficient brain. Arterioscler Thromb Vasc Biol 2012; 33:305-10. [PMID: 23241407 DOI: 10.1161/atvbaha.112.300485] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
OBJECTIVE Vessels in brain arteriovenous malformations are prone to rupture. The underlying pathogenesis is not clear. Hereditary hemorrhagic telangiectasia type 2 patients with activin receptor-like kinase 1 (Alk1) mutation have a higher incidence of brain arteriovenous malformation than the general population. We tested the hypothesis that vascular endothelial growth factor impairs vascular integrity in the Alk1-deficient brain through reduction of mural cell coverage. METHODS AND RESULTS Adult Alk1(1f/2f) mice (loxP sites flanking exons 4-6) and wild-type mice were injected with 2×10(7) PFU adenovious-cre recombinase and 2×10(9) genome copies of adeno-associated virus-vascular endothelial growth factor to induce focal homozygous Alk1 deletion (in Alk1(1f/2f) mice) and angiogenesis. Brain vessels were analyzed 8 weeks later. Compared with wild-type mice, the Alk1-deficient brain had more fibrin (99±30×10(3) pixels/mm(2) versus 40±13×10(3); P=0.001), iron deposition (508±506 pixels/mm(2) versus 6±49; P=0.04), and Iba1(+) microglia/macrophage infiltration (888±420 Iba1(+) cells/mm(2) versus 240±104 Iba1(+); P=0.001) after vascular endothelial growth factor stimulation. In the angiogenic foci, the Alk1-deficient brain had more α-smooth muscle actin negative vessels (52±9% versus 12±7%, P<0.001), fewer vascular-associated pericytes (503±179/mm(2) versus 931±115, P<0.001), and reduced platelet-derived growth factor receptor-β expression. CONCLUSIONS Reduction of mural cell coverage in response to vascular endothelial growth factor stimulation is a potential mechanism for the impairment of vessel wall integrity in hereditary hemorrhagic telangiectasia type 2-associated brain arteriovenous malformation.
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MESH Headings
- Actins/metabolism
- Activin Receptors, Type I/deficiency
- Activin Receptors, Type I/genetics
- Activin Receptors, Type II
- Animals
- Becaplermin
- Blood Vessels/enzymology
- Blood Vessels/pathology
- Brain/blood supply
- Dependovirus/genetics
- Disease Models, Animal
- Fibrin/metabolism
- Gene Transfer Techniques
- Genetic Vectors
- Iron/metabolism
- Macrophages/metabolism
- Macrophages/pathology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Microglia/metabolism
- Microglia/pathology
- Neovascularization, Pathologic
- Pericytes/enzymology
- Pericytes/pathology
- Proto-Oncogene Proteins c-sis/metabolism
- Receptor, Platelet-Derived Growth Factor beta/metabolism
- Telangiectasia, Hereditary Hemorrhagic/enzymology
- Telangiectasia, Hereditary Hemorrhagic/genetics
- Telangiectasia, Hereditary Hemorrhagic/pathology
- Vascular Endothelial Growth Factor A/genetics
- Vascular Endothelial Growth Factor A/metabolism
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Affiliation(s)
- Wanqiu Chen
- Department of Anesthesia and Perioperative Care, Center for Cerebrovascular Research, University of California, San Francisco, CA 94110, USA
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22
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Safaee M, Oh MC, Bloch O, Sun MZ, Kaur G, Auguste KI, Tihan T, Parsa AT. Choroid plexus papillomas: advances in molecular biology and understanding of tumorigenesis. Neuro Oncol 2012; 15:255-67. [PMID: 23172371 DOI: 10.1093/neuonc/nos289] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Choroid plexus papillomas are rare, benign tumors originating from the choroid plexus. Although generally found within the ventricular system, they can arise ectopically in the brain parenchyma or disseminate throughout the neuraxis. We sought to review recent advances in our understanding of the molecular biology and oncogenic pathways associated with this disease. A comprehensive PubMed literature review was conducted to identify manuscripts discussing the clinical, molecular, and genetic features of choroid plexus papillomas. Articles concerning diagnosis, treatment, and long-term patient outcomes were also reviewed. The introduction of atypical choroid plexus papilloma as a distinct entity has increased the need for accurate histopathologic diagnosis. Advances in immunohistochemical staining have improved our ability to differentiate choroid plexus papillomas from other intracranial tumors or metastatic lesions using combinations of key markers and mitotic indices. Recent findings have implicated Notch3 signaling, the transcription factor TWIST1, platelet-derived growth factor receptor, and the tumor necrosis factor-related apoptosis-inducing ligand pathway in choroid plexus papilloma tumorigenesis. A combination of commonly occurring chromosomal duplications and deletions has also been identified. Surgical resection remains the standard of care, although chemotherapy and radiotherapy may be considered for recurrent or metastatic lesions. While generally considered benign, these tumors possess a complex biology that sheds insight into other choroid plexus tumors, particularly malignant choroid plexus carcinomas. Improving our understanding of the molecular biology, genetics, and oncogenic pathways associated with this tumor will allow for the development of targeted therapies and improved outcomes for patients with this disease.
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Affiliation(s)
- Michael Safaee
- Department of Neurological Surgery, University of California at San Francisco, 505 Parnassus Ave., San Francisco, CA 94117, USA
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Eliades A, Matsuura S, Ravid K. Oxidases and reactive oxygen species during hematopoiesis: a focus on megakaryocytes. J Cell Physiol 2012; 227:3355-62. [PMID: 22331622 DOI: 10.1002/jcp.24071] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Reactive oxygen species (ROS), generated as a result of various reactions, control an array of cellular processes. The role of ROS during megakaryocyte (MK) development has been a subject of interest and research. The bone marrow niche is a site of MK differentiation and maturation. In this environment, a gradient of oxygen tension, from normoxia to hypoxia results in different levels of ROS, impacting cellular physiology. This article provides an overview of major sources of ROS, their implication in different signaling pathways, and their effect on cellular physiology, with a focus on megakaryopoiesis. The importance of ROS-generating oxidases in MK biology and pathology, including myelofibrosis, is also described.
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Affiliation(s)
- Alexia Eliades
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA
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24
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Chhabra A, Lechner AJ, Ueno M, Acharya A, Van Handel B, Wang Y, Iruela-Arispe ML, Tallquist MD, Mikkola HKA. Trophoblasts regulate the placental hematopoietic niche through PDGF-B signaling. Dev Cell 2012; 22:651-9. [PMID: 22387002 DOI: 10.1016/j.devcel.2011.12.022] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 10/10/2011] [Accepted: 12/22/2011] [Indexed: 01/13/2023]
Abstract
The placenta is a hematopoietic organ that supports hematopoietic stem/progenitor cell (HSPC) generation and expansion without promoting differentiation. We identified PDGF-B signaling in trophoblasts as a key component of the unique placental hematopoietic microenvironment that protects HSPCs from premature differentiation. Loss of PDGF-B or its receptor, PDGFRβ, induced definitive erythropoiesis in placental labyrinth vasculature. This was evidenced by accumulation of CFU-Es and actively proliferating definitive erythroblasts that clustered around central macrophages, highly reminiscent of erythropoiesis in the fetal liver. Ectopic erythropoiesis was not due to a requirement of PDGF-B signaling in hematopoietic cells but rather in placental trophoblasts, which upregulated Epo in the absence of PDGF-B signaling. Furthermore, overexpression of hEPO specifically in the trophoblasts in vivo was sufficient to convert the placenta into an erythropoietic organ. These data provide genetic evidence of a signaling pathway that is required to restrict erythroid differentiation to specific anatomical niches during development.
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Affiliation(s)
- Akanksha Chhabra
- Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
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25
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Suzuki E, Aoyama K, Fukui T, Nakamura Y, Yamane A. The function of platelet-derived growth factor in the differentiation of mouse tongue striated muscle. Orthod Craniofac Res 2012; 15:39-51. [PMID: 22264326 DOI: 10.1111/j.1601-6343.2011.01535.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To determine the function of platelet-derived growth factor (PDGF) in the final differentiation phase of tongue striated muscle cells. MATERIALS AND METHODS We analyzed the expressions of PDGF-A, -B, platelet-derived growth factor receptor (PDGFR)-α, and PDGFR-β in mouse tongues between embryonic days (E) 11 and 15. Furthermore, we examined the effects of human recombinant PDGF-AB and the peptide antagonist for PDGFRs using an organ culture system of mouse embryonic tongue. Mouse tongues at E12 were cultured in BGJb medium containing human recombinant PDGF-AB for 4 days or the peptide antagonist for PDGF receptors for 8 days. RESULTS PDGF-A, -B, PDGFR-α, and -β were expressed in the differentiating muscle cells between E11 and 15. The human recombinant PDGF-AB induced increases in the mRNA expressions of myogenin and muscle creatine kinase (MCK) and the number of fast myosin heavy chain (fMHC)-positive cells, markers for the differentiation of muscle cells. On the other hand, the peptide antagonist for PDGFRs induced suppressions in the mRNA expressions of myogenin and MCK, and the number of fMHC-positive cells. Both the PDGF-AB and the antagonist failed to affect the expressions of cell proliferation markers. CONCLUSION These results suggest that PDGF functions as a positive regulator in the final differentiation phase of tongue muscle cells in mouse embryos.
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Affiliation(s)
- E Suzuki
- Department of Orthodontics, Tsurumi University School of Dental Medicine, Tsurumi-ku, Yokohama, Japan
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26
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Beham AW, Puellmann K, Laird R, Fuchs T, Streich R, Breysach C, Raddatz D, Oniga S, Peccerella T, Findeisen P, Kzhyshkowska J, Gratchev A, Schweyer S, Saunders B, Wessels JT, Möbius W, Keane J, Becker H, Ganser A, Neumaier M, Kaminski WE. A TNF-regulated recombinatorial macrophage immune receptor implicated in granuloma formation in tuberculosis. PLoS Pathog 2011; 7:e1002375. [PMID: 22114556 PMCID: PMC3219713 DOI: 10.1371/journal.ppat.1002375] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Accepted: 09/28/2011] [Indexed: 12/23/2022] Open
Abstract
Macrophages play a central role in host defense against mycobacterial infection and anti- TNF therapy is associated with granuloma disorganization and reactivation of tuberculosis in humans. Here, we provide evidence for the presence of a T cell receptor (TCR) αβ based recombinatorial immune receptor in subpopulations of human and mouse monocytes and macrophages. In vitro, we find that the macrophage-TCRαβ induces the release of CCL2 and modulates phagocytosis. TNF blockade suppresses macrophage-TCRαβ expression. Infection of macrophages from healthy individuals with mycobacteria triggers formation of clusters that express restricted TCR Vβ repertoires. In vivo, TCRαβ bearing macrophages abundantly accumulate at the inner host-pathogen contact zone of caseous granulomas from patients with lung tuberculosis. In chimeric mouse models, deletion of the variable macrophage-TCRαβ or TNF is associated with structurally compromised granulomas of pulmonary tuberculosis even in the presence of intact T cells. These results uncover a TNF-regulated recombinatorial immune receptor in monocytes/macrophages and demonstrate its implication in granuloma formation in tuberculosis.
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Affiliation(s)
| | - Kerstin Puellmann
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School (MHH), Hannover, Germany
| | - Rebecca Laird
- Department of Surgery, University of Göttingen, Göttingen, Germany
| | - Tina Fuchs
- Institute for Clinical Chemistry, University of Heidelberg Medical Faculty Mannheim, Mannheim, Germany
| | - Roswita Streich
- Department of Surgery, University of Göttingen, Göttingen, Germany
| | | | - Dirk Raddatz
- Department of Medicine, University of Göttingen, Göttingen, Germany
| | - Septimia Oniga
- Institute for Clinical Chemistry, University of Heidelberg Medical Faculty Mannheim, Mannheim, Germany
| | - Teresa Peccerella
- Institute for Clinical Chemistry, University of Heidelberg Medical Faculty Mannheim, Mannheim, Germany
| | - Peter Findeisen
- Institute for Clinical Chemistry, University of Heidelberg Medical Faculty Mannheim, Mannheim, Germany
| | - Julia Kzhyshkowska
- Department of Dermatology, University of Heidelberg Medical Faculty Mannheim, Mannheim, Germany
- Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Alexei Gratchev
- Department of Dermatology, University of Heidelberg Medical Faculty Mannheim, Mannheim, Germany
- Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Stefan Schweyer
- Department of Pathology, University of Göttingen, Göttingen, Germany
| | - Bernadette Saunders
- Medicine, Central Clinical School, Centenary Institute of Cancer Medicine and Cell Biology, Sydney, Australia
| | - Johannes T. Wessels
- Department of Nephrology/Rheumatology, University of Göttingen, Göttingen, Germany
| | - Wiebke Möbius
- Max-Planck-Institute of Experimental Medicine, Department of Neurogenetics, Göttingen, Germany
- Trinity College Dublin, Institute of Molecular Medicine, College Green, Dublin, Ireland
| | - Joseph Keane
- Trinity College Dublin, Institute of Molecular Medicine, College Green, Dublin, Ireland
| | - Heinz Becker
- Department of Surgery, University of Göttingen, Göttingen, Germany
| | - Arnold Ganser
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School (MHH), Hannover, Germany
| | - Michael Neumaier
- Institute for Clinical Chemistry, University of Heidelberg Medical Faculty Mannheim, Mannheim, Germany
| | - Wolfgang E. Kaminski
- Institute for Clinical Chemistry, University of Heidelberg Medical Faculty Mannheim, Mannheim, Germany
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27
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Olaharski AJ, Bitter H, Gonzaludo N, Kondru R, Goldstein DM, Zabka TS, Lin H, Singer T, Kolaja K. Modeling bone marrow toxicity using kinase structural motifs and the inhibition profiles of small molecular kinase inhibitors. Toxicol Sci 2010; 118:266-75. [PMID: 20810542 DOI: 10.1093/toxsci/kfq258] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The cellular function of kinases combined with the difficulty of designing selective small molecule kinase inhibitors (SMKIs) poses a challenge for drug development. The late-stage attrition of SMKIs could be lessened by integrating safety information of kinases into the lead optimization stage of drug development. Herein, a mathematical model to predict bone marrow toxicity (BMT) is presented which enables the rational design of SMKIs away from this safety liability. A specific example highlights how this model identifies critical structural modifications to avoid BMT. The model was built using a novel algorithm, which selects 19 representative kinases from a panel of 277 based upon their ATP-binding pocket sequences and ability to predict BMT in vivo for 48 SMKIs. A support vector machine classifier was trained on the selected kinases and accurately predicts BMT with 74% accuracy. The model provides an efficient method for understanding SMKI-induced in vivo BMT earlier in drug discovery.
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28
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New insights into the mechanisms of hematopoietic cell transformation by activated receptor tyrosine kinases. Blood 2010; 116:2429-37. [PMID: 20581310 DOI: 10.1182/blood-2010-04-279752] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
A large number of alterations in genes encoding receptor tyrosine kinase (RTK), namely FLT3, c-KIT, platelet-derived growth factor (PDGF) receptors, fibroblast growth factor (FGF) receptors, and the anaplastic large cell lymphoma kinase (ALK), have been found in hematopoietic malignancies. They have drawn much attention after the development of tyrosine kinase inhibitors. RTK gene alterations include point mutations and gene fusions that result from chromosomal rearrangements. In both cases, they activate the kinase domain in the absence of ligand, producing a permanent signal for cell proliferation. Recently, this simple model has been refined. First, by contrast to wild-type RTK, many mutated RTK do not seem to signal from the plasma membrane, but from various locations inside the cell. Second, their signal transduction properties are altered: the pathways that are crucial for cell transformation, such as signal transducer and activator of transcription (STAT) factors, do not necessarily contribute to the physiologic functions of these receptors. Finally, different mechanisms prevent the termination of the signal, which normally occurs through receptor ubiquitination and degradation. Several mutations inactivating CBL, a key RTK E3 ubiquitin ligase, have been recently described. In this review, we discuss the possible links among RTK trafficking, signaling, and degradation in leukemic cells.
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29
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Ye JY, Chan GCF, Qiao L, Lian Q, Meng FY, Luo XQ, Khachigian LM, Ma M, Deng R, Chen JL, Chong BH, Yang M. Platelet-derived growth factor enhances platelet recovery in a murine model of radiation-induced thrombocytopenia and reduces apoptosis in megakaryocytes via its receptors and the PI3-k/Akt pathway. Haematologica 2010; 95:1745-53. [PMID: 20562316 DOI: 10.3324/haematol.2009.020958] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Platelet-derived growth factor is involved in the regulation of hematopoiesis. Imatinib mesylate, a platelet-derived growth factor receptor inhibitor, induces thrombocytopenia in a significant proportion of patients with chronic myeloid leukemia. Although our previous studies showed that platelet-derived growth factor enhances megakaryocytopoiesis in vitro, the in vivo effect of platelet-derived growth factor in a model of radiation-induced thrombocytopenia has not been reported. DESIGN AND METHODS In this study, we investigated the effect of platelet-derived growth factor on hematopoietic stem/progenitor cells and platelet production using an irradiated-mouse model. We also explored the potential molecular mechanisms of platelet-derived growth factor on thrombopoiesis in M-07e cells. RESULTS Platelet-derived growth factor, like thrombopoietin, significantly promoted the recovery of platelets and the formation of bone marrow colony-forming unit-megakaryocyte in irradiated mice. Histology confirmed the protective effect of platelet-derived growth factor, as shown by an increased number of hematopoietic stem/progenitor cells and a reduction of apoptosis. In a megakaryocytic apoptotic model, platelet-derived growth factor had a similar anti-apoptotic effect as thrombopoietin on megakaryocytes. We also demonstrated that platelet-derived growth factor activated the PI3-k/Akt signaling pathway, while addition of imatinib mesylate reduced p-Akt expression. CONCLUSIONS Our findings show that platelet-derived growth factor enhances platelet recovery in mice with radiation-induced thrombocytopenia. This radioprotective effect is likely to be mediated via platelet-derived growth factor receptors with subsequent activation of the PI3-k/Akt pathway. We also provide a possible explanation that blockage of platelet-derived growth factor receptors may reduce thrombopoiesis and play a role in imatinib mesylate-induced thrombocytopenia.
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Affiliation(s)
- Jie Yu Ye
- Department of Paediatrics and Adolescent Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
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Chen L, He Z, Chen B, Zhao Y, Sun W, Xiao Z, Zhang J, Yang M, Gao Z, Dai J. Direct chemical cross-linking of platelet-derived growth factor-BB to the demineralized bone matrix improves cellularization and vascularization. Biomacromolecules 2010; 10:3193-8. [PMID: 19891448 DOI: 10.1021/bm900850q] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In previous studies, we have described the use of demineralized bone matrix (DBM) as a carrier for the localized delivery system of growth factors in vitro and in vivo. The aim of the present work was to develop a direct chemical approach to immobilize the platelet-derived growth factor-BB (PDGF-BB) on DBM with cross-linking reagents. The amount of PDGF-BB covalently immobilized on DBM was significantly increased. The increased proliferation of fibroblasts demonstrated that the biological activity of PDGF-BB was not significantly reduced by cross-linking. Compared with control groups, there was a statistically significant increase in blood vessel density in the PDGF-C-DBM group after having been subcutaneously implanted into the dorsal side of the rats. The surface bioactivity of scaffolds on stimulation cell and new blood vessel invasion was improved. Therefore, the direct chemical cross-linking approach could be used to retain growth factors on collagen scaffolds effectively to develop functional biomaterials.
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Affiliation(s)
- Lei Chen
- Biotechnology Research Center/Hubei Province Key Laboratory of Natural Products Research and Development, China Three Gorges University, Yichang 443002, PR China
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31
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Quintás-Cardama A, Kantarjian H, Ravandi F, O’Brien S, Thomas D, Vidal-Senmache G, Wierda W, Kornblau S, Cortes J. Bleeding diathesis in patients with chronic myelogenous leukemia receiving dasatinib therapy. Cancer 2009; 115:2482-90. [PMID: 19280591 PMCID: PMC4180711 DOI: 10.1002/cncr.24257] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND The most frequent nonhematologic side effects associated with dasatinib therapy in patients with chronic myeloid leukemia (CML) are gastrointestinal, rash, and fluid retention syndromes. However, bleeding has been observed in some patients receiving dasatinib. In the current study, the authors investigated the risk factors and management of bleeding associated with dasatinib therapy for CML after imatinib failure. METHODS The bleeding episodes associated with dasatinib therapy in 138 patients with CML who were consecutively treated at the study institution in clinical trials were evaluated. RESULTS Bleeding occurred in 32 (23%) patients (grade >or=3 in 9 [7%] patients [according to National Cancer Institute Common Toxicity Criteria]), including in 12% of patients treated in chronic phase, 31% of patients treated in accelerated phase (AP), and 35% of patients treated in blast phase (BP) (P = .02). The majority of episodes (81%) affected the gastrointestinal tract. Basic coagulation studies were normal in 97% of patients who developed bleeding complications. Although 37% of episodes occurred with platelet counts >100 x 10(9)/L, multivariate analysis identified thrombocytopenia and advanced phase CML as risk factors for bleeding. A trend toward an increased risk with a twice-daily schedule was observed (P = .17). Management included dasatinib interruption for a median of 17 days (range, 3-51 days) in 47%, of patients and transfusions in 72% of patients. CONCLUSIONS Bleeding occurs during dasatinib therapy, particularly in patients with AP or BP disease and low platelet counts. Appropriate clinical monitoring and the timely interruption of dasatinib therapy are warranted in this subset of patients.
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Affiliation(s)
- Alfonso Quintás-Cardama
- Department of Leukemia, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Hagop Kantarjian
- Department of Leukemia, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Farhad Ravandi
- Department of Leukemia, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Susan O’Brien
- Department of Leukemia, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Deborah Thomas
- Department of Leukemia, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | | | - William Wierda
- Department of Leukemia, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Steven Kornblau
- Department of Leukemia, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Jorge Cortes
- Department of Leukemia, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
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Osteoclasts control osteoblast chemotaxis via PDGF-BB/PDGF receptor beta signaling. PLoS One 2008; 3:e3537. [PMID: 18953417 PMCID: PMC2569415 DOI: 10.1371/journal.pone.0003537] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Accepted: 09/30/2008] [Indexed: 11/21/2022] Open
Abstract
Background Bone remodeling relies on the tightly regulated interplay between bone forming osteoblasts and bone digesting osteoclasts. Several studies have now described the molecular mechanisms by which osteoblasts control osteoclastogenesis and bone degradation. It is currently unclear whether osteoclasts can influence bone rebuilding. Methodology/Principal Findings Using in vitro cell systems, we show here that mature osteoclasts, but not their precursors, secrete chemotactic factors recognized by both mature osteoblasts and their precursors. Several growth factors whose expression is upregulated during osteoclastogenesis were identified by DNA microarrays as candidates mediating osteoblast chemotaxis. Our subsequent functional analyses demonstrate that mature osteoclasts, whose platelet-derived growth factor bb (PDGF-bb) expression is reduced by siRNAs, exhibit a reduced capability of attracting osteoblasts. Conversely, osteoblasts whose platelet-derived growth factor receptor β (PDGFR-β) expression is reduced by siRNAs exhibit a lower capability of responding to chemotactic factors secreted by osteoclasts. Conclusions/Significance We conclude that, in vitro mature osteoclasts control osteoblast chemotaxis via PDGF-bb/PDGFR-β signaling. This may provide one key mechanism by which osteoclasts control bone formation in vivo.
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Abstract
Platelet-derived growth factors (PDGFs) and their receptors (PDGFRs) have served as prototypes for growth factor and receptor tyrosine kinase function for more than 25 years. Studies of PDGFs and PDGFRs in animal development have revealed roles for PDGFR-alpha signaling in gastrulation and in the development of the cranial and cardiac neural crest, gonads, lung, intestine, skin, CNS, and skeleton. Similarly, roles for PDGFR-beta signaling have been established in blood vessel formation and early hematopoiesis. PDGF signaling is implicated in a range of diseases. Autocrine activation of PDGF signaling pathways is involved in certain gliomas, sarcomas, and leukemias. Paracrine PDGF signaling is commonly observed in epithelial cancers, where it triggers stromal recruitment and may be involved in epithelial-mesenchymal transition, thereby affecting tumor growth, angiogenesis, invasion, and metastasis. PDGFs drive pathological mesenchymal responses in vascular disorders such as atherosclerosis, restenosis, pulmonary hypertension, and retinal diseases, as well as in fibrotic diseases, including pulmonary fibrosis, liver cirrhosis, scleroderma, glomerulosclerosis, and cardiac fibrosis. We review basic aspects of the PDGF ligands and receptors, their developmental and pathological functions, principles of their pharmacological inhibition, and results using PDGF pathway-inhibitory or stimulatory drugs in preclinical and clinical contexts.
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Jin Q, Wei G, Lin Z, Sugai JV, Lynch SE, Ma PX, Giannobile WV. Nanofibrous scaffolds incorporating PDGF-BB microspheres induce chemokine expression and tissue neogenesis in vivo. PLoS One 2008; 3:e1729. [PMID: 18320048 PMCID: PMC2248711 DOI: 10.1371/journal.pone.0001729] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Accepted: 01/24/2008] [Indexed: 11/19/2022] Open
Abstract
Platelet-derived growth factor (PDGF) exerts multiple cellular effects that stimulate wound repair in multiple tissues. However, a major obstacle for its successful clinical application is the delivery system, which ultimately controls the in vivo release rate of PDGF. Polylactic-co-glycolic acid (PLGA) microspheres (MS) in nanofibrous scaffolds (NFS) have been shown to control the release of rhPDGF-BB in vitro. In order to investigate the effects of rhPDGF-BB release from MS in NFS on gene expression and enhancement of soft tissue engineering, rhPDGF-BB was incorporated into differing molecular weight (MW) polymeric MS. By controlling the MW of the MS over a range of 6.5 KDa–64 KDa, release rates of PDGF can be regulated over periods of weeks to months in vitro. The NFS-MS scaffolds were divided into multiple groups based on MS release characteristics and PDGF concentration ranging from 2.5–25.0 µg and evaluated in vivo in a soft tissue wound repair model in the dorsa of rats. At 3, 7, 14 and 21 days post-implantation, the scaffold implants were harvested followed by assessments of cell penetration, vasculogenesis and tissue neogenesis. Gene expression profiles using cDNA microarrays were performed on the PDGF-releasing NFS. The percentage of tissue invasion into MS-containing NFS at 7 days was higher in the PDGF groups when compared to controls. Blood vessel number in the HMW groups containing either 2.5 or 25 µg PDGF was increased above those of other groups at 7d (p<0.01). Results from cDNA array showed that PDGF strongly enhanced in vivo gene expression of the CXC chemokine family members such as CXCL1, CXCL2 and CXCL5. Thus, sustained release of rhPDGF-BB, controlled by slow-releasing MS associated with the NFS delivery system, enhanced cell migration and angiogenesis in vivo, and may be related to an induced expression of chemokine-related genes. This approach offers a technology to accurately control growth factor release to promote soft tissue engineering in vivo.
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Affiliation(s)
- Qiming Jin
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Guobao Wei
- Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Zhao Lin
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, United States of America
| | - James V. Sugai
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Samuel E. Lynch
- Biomimetic Therapeutics, Inc., Franklin, Tennessee, United States of America
| | - Peter X. Ma
- Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
- Department of Biologic and Material Sciences, School of Dentistry, University of Michigan, Ann Arbor, Michigan, United States of America
| | - William V. Giannobile
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, United States of America
- Michigan Center for Oral Health Research, School of Dentistry, University of Michigan, Ann Arbor, Michigan, United States of America
- * To whom correspondence should be addressed. E-mail:
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35
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Claxton S, Kostourou V, Jadeja S, Chambon P, Hodivala-Dilke K, Fruttiger M. Efficient, inducible Cre-recombinase activation in vascular endothelium. Genesis 2008; 46:74-80. [PMID: 18257043 DOI: 10.1002/dvg.20367] [Citation(s) in RCA: 237] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In recent years, gene-targeting studies in mice have elucidated many molecular mechanisms in vascular biology. However, it has been difficult to apply this approach to the study of postnatal animals because mutations affecting the vasculature are often embryonically lethal. We have therefore generated transgenic mice that express a tamoxifen-inducible form of Cre recombinase (iCreER(T2)) in vascular endothelial cells using a phage artificial chromosome (PAC) containing the Pdgfb gene (Pdgfb-iCreER mice). This allows the genetic targeting of the vascular endothelium in postnatal animals. We tested efficiency of tamoxifen-induced iCre recombinase activity with ROSA26-lacZ reporter mice and found that in newborn animals recombination could be achieved in most capillary and small vessel endothelial cells in most organs including the central nervous system. In adult animals, recombination activity was also widespread in capillary beds of skeletal muscle, heart, skin, and gut but not in the central nervous system where only a subpopulation of endothelial cells was labeled. We also tested recombination efficiency in a subcutaneous tumor model and found recombination activity in all detectable tumor blood vessels. Thus, Pdgfb-iCreER mice are a valuable research tool to manipulate endothelial cells in postnatal mice and study tumor angiogenesis.
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Affiliation(s)
- Suzanne Claxton
- National Institute of Medical Research, MRC, London, United Kingdom
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36
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Redig AJ, Platanias LC. The protein kinase C (PKC) family of proteins in cytokine signaling in hematopoiesis. J Interferon Cytokine Res 2007; 27:623-36. [PMID: 17784814 DOI: 10.1089/jir.2007.0007] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The members of the protein kinase C (PKC) family of proteins play important roles in signaling for various growth factors, cytokines, and hormones. Extensive work over the years has led to the identification of three major groups of PKC isoforms. These include the classic PKCs (PKCalpha, PKCbeta(I), PKCbeta(II), PKCgamma), the novel PKCs (PKCdelta, PKCepsilon, PKCeta, PKCmu, PKCtheta), and the atypical PKCs (PKCzeta, PKCiota/lambda). All these PKC subtypes have been shown to participate in the generation of signals for important cellular processes and to mediate diverse and, in some cases, opposing biologic responses. There is emerging evidence that these kinases also play key functional roles in the regulation of cell growth, apoptosis, and differentiation of hematopoietic cells. In this review, both the engagement of the various PKC members in cytokine and growth factor signaling and their role in the regulation of hematopoiesis are discussed.
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Affiliation(s)
- Amanda J Redig
- Robert H. Lurie Comprehensive Cancer Center and Division of Hematology-Oncology, Northwestern University Medical School, 300 East Superior Street, Chicago, IL 60611, USA
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37
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David M, Cross NCP, Burgstaller S, Chase A, Curtis C, Dang R, Gardembas M, Goldman JM, Grand F, Hughes G, Huguet F, Lavender L, McArthur GA, Mahon FX, Massimini G, Melo J, Rousselot P, Russell-Jones RJ, Seymour JF, Smith G, Stark A, Waghorn K, Nikolova Z, Apperley JF. Durable responses to imatinib in patients with PDGFRB fusion gene-positive and BCR-ABL-negative chronic myeloproliferative disorders. Blood 2006; 109:61-4. [PMID: 16960151 DOI: 10.1182/blood-2006-05-024828] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Fusion genes derived from the platelet-derived growth factor receptor beta (PDGFRB) or alpha (PDGFRA) play an important role in the pathogenesis of BCR-ABL-negative chronic myeloproliferative disorders (CMPDs). These fusion genes encode constitutively activated receptor tyrosine kinases that can be inhibited by imatinib. Twelve patients with BCR-ABL-negative CMPDs and reciprocal translocations involving PDGFRB received imatinib for a median of 47 months (range, 0.1-60 months). Eleven had prompt responses with normalization of peripheral-blood cell counts and disappearance of eosinophilia; 10 had complete resolution of cytogenetic abnormalities and decrease or disappearance of fusion transcripts as measured by reverse transcriptase-polymerase chain reaction (RT-PCR). Updates were sought from 8 further patients previously described in the literature; prompt responses were described in 7 and persist in 6. Our data show that durable hematologic and cytogenetic responses are achieved with imatinib in patients with PDGFRB fusion-positive, BCR-ABL-negative CMPDs.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Antineoplastic Agents/therapeutic use
- Benzamides
- Biomarkers, Tumor/blood
- Child
- Child, Preschool
- Drug Evaluation
- Eosinophilia/etiology
- Female
- Follow-Up Studies
- Fusion Proteins, bcr-abl/blood
- Humans
- Imatinib Mesylate
- Infant
- Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative/blood
- Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative/drug therapy
- Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative/genetics
- Male
- Middle Aged
- Myeloproliferative Disorders/blood
- Myeloproliferative Disorders/drug therapy
- Myeloproliferative Disorders/genetics
- Oncogene Proteins, Fusion/blood
- Oncogene Proteins, Fusion/genetics
- Piperazines/therapeutic use
- Protein Kinase Inhibitors/therapeutic use
- Pyrimidines/therapeutic use
- RNA, Messenger/blood
- RNA, Neoplasm/blood
- Receptor, Platelet-Derived Growth Factor beta/blood
- Receptor, Platelet-Derived Growth Factor beta/genetics
- Retrospective Studies
- Reverse Transcriptase Polymerase Chain Reaction
- Translocation, Genetic
- Treatment Outcome
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Affiliation(s)
- Marianna David
- Department of Haematology, University of Pecs, Pecs, Hungary
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38
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Tang J, Kozaki K, Farr AG, Martin PJ, Lindahl P, Betsholtz C, Raines EW. The absence of platelet-derived growth factor-B in circulating cells promotes immune and inflammatory responses in atherosclerosis-prone ApoE-/- mice. THE AMERICAN JOURNAL OF PATHOLOGY 2005; 167:901-12. [PMID: 16127167 PMCID: PMC1698743 DOI: 10.1016/s0002-9440(10)62061-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Both innate and adaptive immunity contribute to the progression of inflammatory-fibrotic lesions of atherosclerosis. Although platelet-derived growth factor (PDGF)-B has been investigated as a stimulant of smooth muscle cells in vascular diseases, its effects on the immune response during disease have not been evaluated in vivo. We used hematopoietic chimeras generated after lethal irradiation of ApoE-/- recipients to test the role of PDGF in atherosclerosis. Monocyte accumulation in early atherosclerotic lesions increased 1.9-fold in ApoE-/-/PDGF-B-/- chimeras. Lymphocytes from null chimeras showed a 1.6- to 2.0-fold increase in the number of activated CD4(+) T cells and a 2.5-fold elevation of interferon-gamma-secreting CD4(+) T cells on ex vivo challenge with modified low-density lipoprotein. Splenocyte transcript levels were also altered with a twofold decrease in interleukin-10 and 1.7- and 3.0-fold increases in interleukin-18 and CCR 5, respectively. These cellular and molecular changes were consistent with a shift to a proinflammatory phenotype in null chimeras. Our data also demonstrated for the first time the presence of a recently discovered family of negative regulators of innate and adaptive immunity, the suppressors of cytokine signaling (SOCS), in developing atherosclerotic lesions. Thus, our studies identify two independent negative immune regulatory pathways-PDGF-B and SOCS-that may help limit lesion expansion.
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Affiliation(s)
- Jingjing Tang
- Department of Pathology, University Of Washington, Seattle, WA 98104-2499, USA
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39
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Abstract
Interactions between endothelial cells and mural cells (pericytes and vascular smooth muscle cells) in the blood vessel wall have recently come into focus as central processes in the regulation of vascular formation, stabilization, remodeling, and function. Failure of the interactions between the 2 cell types, as seen in numerous genetic mouse models, results in severe and often lethal cardiovascular defects. Abnormal interactions between the 2 cell types are also implicated in a number of human pathological conditions, including tumor angiogenesis, diabetic microangiopathy, ectopic tissue calcification, and stroke and dementia syndrome CADASIL. In the present review, we summarize current knowledge concerning the identity, characteristics, diversity, ontogeny, and plasticity of pericytes. We focus on the advancement in recent years of the understanding of intercellular communication between endothelial and mural cells with a focus on transforming growth factor beta, angiopoietins, platelet-derived growth factor, spingosine-1-phosphate, and Notch ligands and their respective receptors. We finally highlight recent important data contributing to the understanding of the role of pericytes in tumor angiogenesis, diabetic retinopathy, and hereditary lymphedema.
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Affiliation(s)
- Annika Armulik
- Division of Matrix Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
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40
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Gekas C, Dieterlen-Lièvre F, Orkin SH, Mikkola HKA. The placenta is a niche for hematopoietic stem cells. Dev Cell 2005; 8:365-75. [PMID: 15737932 DOI: 10.1016/j.devcel.2004.12.016] [Citation(s) in RCA: 434] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2004] [Revised: 12/16/2004] [Accepted: 12/17/2004] [Indexed: 01/13/2023]
Abstract
The hematopoietic system develops during embryogenesis at temporally and anatomically restricted sites. The anatomical origin of definitive HSCs is not fully resolved, and little is known about how the different fetal hematopoietic microenvironments direct HSC development. Here, we show that the mouse placenta functions as a hematopoietic organ that harbors a large pool of pluripotent HSCs during midgestation. The onset of HSC activity in the placenta parallels that of the AGM (aorta-gonad-mesonephros) region starting at E10.5-E11.0. However, the placental HSC pool expands until E12.5-E13.5 and contains >15-fold more HSCs than the AGM. The expansion of the CD34(+)c-kit(+) HSC pool in the placenta occurs prior to and during the initial expansion of HSCs in the fetal liver. Importantly, the placental HSC pool is not explained by rare circulating HSCs, which appear later. These data support an important, but unappreciated, role for the placenta in establishing the mammalian definitive hematopoietic system.
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Affiliation(s)
- Christos Gekas
- Department of Pediatric Oncology, Dana-Farber Cancer Institute and, Childrens Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
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41
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Jin Q, Anusaksathien O, Webb SA, Printz MA, Giannobile WV. Engineering of tooth-supporting structures by delivery of PDGF gene therapy vectors. Mol Ther 2004; 9:519-26. [PMID: 15093182 PMCID: PMC2572773 DOI: 10.1016/j.ymthe.2004.01.016] [Citation(s) in RCA: 105] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/23/2004] [Indexed: 12/21/2022] Open
Abstract
Platelet-derived growth factor (PDGF) exerts potent effects on wound healing including the regeneration of tooth-supporting structures. Limitations of topical protein delivery to periodontal osseous defects include transient biological activity and the bioavailability of PDGF at the wound site. The objective of this investigation was to determine the feasibility of in vivo PDGF-B gene transfer to stimulate periodontal tissue regeneration in large tooth-associated alveolar bone defects in rats. Periodontal lesions (0.3 x 0.2 cm in size) were treated with a 2.6% collagen matrix alone or a matrix containing adenoviruses encoding luciferase (control), a dominant negative mutant of PDGF-A (PDGF-1308), or PDGF-B. Block biopsies were harvested at 3, 7, and 14 days post-gene delivery and descriptive histology and histomorphometric analyses were performed. The defects treated with Ad-PDGF-B demonstrated greater proliferating cell nuclear antigen positively stained cells and strong evidence of bone and cementum regeneration beyond that of Ad-luciferase and Ad-PDGF-1308 groups. Quantitative image analysis showed a nearly fourfold increase in bridging bone and sixfold increase in tooth-lining cemental repair in the Ad-PDGF-B-treated sites compared to lesions treated with Ad-luciferase or collagen matrix alone, which showed limited hard tissue neogenesis. In addition, the Xenogen In Vivo Imaging System revealed sustained and localized gene expression of the luciferase reporter at the periodontal lesions for up to 21 days after gene transfer. These results indicate that in vivo direct gene transfer of PDGF-B stimulates alveolar bone and cementum regeneration in large periodontal defects. Gene therapy utilizing PDGF-B may offer the potential for periodontal tissue engineering applications.
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Affiliation(s)
- Qiming Jin
- Center for Craniofacial Regeneration and Department of Periodontics, Prevention, and Geriatrics, School of Dentistry, University of Michigan, 1011 North University Avenue, Ann Arbor, MI 48109-1078, USA
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42
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Bjarnegård M, Enge M, Norlin J, Gustafsdottir S, Fredriksson S, Abramsson A, Takemoto M, Gustafsson E, Fässler R, Betsholtz C. Endothelium-specific ablation of PDGFB leads to pericyte loss and glomerular, cardiac and placental abnormalities. Development 2004; 131:1847-57. [PMID: 15084468 DOI: 10.1242/dev.01080] [Citation(s) in RCA: 258] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Platelet-derived growth factor-B (PDGFB) is necessary for normal cardiovascular development, but the relative importance of different cellular sources of PDGFB has not been established. Using Cre-lox techniques, we show here that genetic ablation of Pdgfb in endothelial cells leads to impaired recruitment of pericytes to blood vessels. The endothelium-restricted Pdgfb knockout mutants also developed organ defects including cardiac, placental and renal abnormalities. These defects were similar to those observed in Pdgfb null mice. However, in marked contrast to the embryonic lethality of Pdgfb null mutants, the endothelium-specific mutants survived into adulthood with persistent pathological changes, including brain microhemorrhages, focal astrogliosis, and kidney glomerulus abnormalities. This spectrum of pathological changes is reminiscent of diabetic microangiopathy, suggesting that the endothelium-restricted Pdgfb knockouts may serve as models for some of the pathogenic events of vascular complications to diabetes.
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Affiliation(s)
- Mattias Bjarnegård
- Department of Medical Biochemistry, Göteborg University, PO Box 440, SE 405 30 Göteborg, Sweden
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43
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Betsholtz C. Biology of platelet-derived growth factors in development. ACTA ACUST UNITED AC 2004; 69:272-85. [PMID: 14745969 DOI: 10.1002/bdrc.10030] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Platelet-derived growth factor (PDGF) was one of the first growth factors to be characterized, and the PDGF family of ligand and receptors has remained an archetype system for studies of the mechanisms of action of growth factors and receptor tyrosine kinases for more than two decades. The small size of the family has also facilitated genetic studies and, in particular, manipulations of the mouse PDGF and PDGF receptor genes have given important insights into the role of this family during mammalian development. These studies have shown that discrete populations of mesenchymal and neuroectodermal progenitor cells depend on PDGF signaling for their growth and distribution within developing organs. Other studies suggest that the same, or similar, cells may be targeted by exaggerated PDGF signaling in a number of pathological processes, including different types of cancer. The present review summarizes current views on the roles of PDGFs in developmental processes, and discusses the critical importance of the amount, spatial distribution, and bioavailability of the PDGF proteins for acquisition of the correct number and location of target cells.
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44
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Snow JW, Abraham N, Ma MC, Goldsmith MA. Bone marrow transplant completely rescues hematolymphoid defects in STAT5A/5B-deficient mice. Exp Hematol 2003; 31:1247-52. [PMID: 14662331 DOI: 10.1016/j.exphem.2003.08.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE STAT5A/5B-deficient mice are recognized to manifest defects in multiple cell types and tissues. In particular, the hematopoietic defects in these mice are widespread, affecting multiple lineages and multiple stages of development. Previous studies indicate that deficiencies intrinsic to hematopoietic cells contribute substantially to the observed defects. However, in light of the broad physiologic effects of STAT5 in the context of the organism outside the blood system, we wished to investigate the possibility of STAT5-dependent environmental influence of nonhematopoietic origin on hematopoietic development in these mice. MATERIALS AND METHODS We transplanted wild-type bone marrow into STAT5A/5B-deficient mice to determine the effects of loss of STAT5 in nonhematopoietic tissue on hematopoietic development. RESULTS We observed that transplantation of wild-type marrow completely corrects hematopoietic defects in STAT5A/5B-deficient recipient mice, including peripheral blood counts, bone marrow cellularity, and reductions in specific progenitor subsets. CONCLUSION These results indicate that the important role of STAT5 in hematolymphoid development are mediated directly through effects on hematopoietic cells and not indirectly.
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Affiliation(s)
- Jonathan W Snow
- Gladstone Institute of Virology and Immunology, Department of Microbiology and Immunology, University of California at San Francisco, San Francisco, CA 94141-9100, USA
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45
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Abstract
Recent advances in genetic manipulation have greatly expanded our understanding of cellular responses to platelet-derived growth factors (PDGFs) during animal development. In addition to driving mesenchymal proliferation, PDGFs have been shown to direct the migration, differentiation and function of a variety of specialized mesenchymal and migratory cell types, both during development and in the adult animal. Furthermore, the availability of genomic sequence data has facilitated the identification of novel PDGF and PDGF receptor (PDGFR) family members in C. elegans, Drosophila, Xenopus, zebrafish and mouse. Early data from these different systems suggest that some functions of PDGFs have been evolutionarily conserved.
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Affiliation(s)
- Renée V Hoch
- Program in Developmental Biology and Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109, USA
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46
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Price RL, Haley ST, Bullard TA, Goldsmith EC, Simpson DG, Thielen TE, Yost MJ, Terracio L. Effects of platelet-derived growth factor-AA and -BB on embryonic cardiac development. THE ANATOMICAL RECORD. PART A, DISCOVERIES IN MOLECULAR, CELLULAR, AND EVOLUTIONARY BIOLOGY 2003; 272:424-33. [PMID: 12704700 DOI: 10.1002/ar.a.10054] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Several studies have shown that disruption of the normal expression patterns of platelet-derived growth factor (PDGF) ligands and receptors during development results in gross cardiac defects and embryonic or neonatal death. However, little is known about the specific role that PDGF plays in the differentiation of cardiac myocytes. In experiments complementing studies that utilized naturally-occurring Patch mice lacking the PDGFr alpha, or knockout animals lacking a PDGF ligand or receptor, we used rat and mouse whole-embryo culture (WEC) techniques to increase the exposure of embryos to the PDGF-AA or -BB ligands. Following a 48-hr culture period, we analyzed heart growth and cardiac myocyte differentiation. Exposure of rat embryos to 50 ng/ml of PDGF-AA resulted in a 42% increase in total protein levels in the heart, but did not result in a significant increase in heart growth, as determined by measurements of the atrioventricular length and the left ventricular length and width. Exposure of embryos to 50 ng/ml of PDGF-BB resulted in a 77% increase in total protein levels and a significant (P < 0.05) 8-15% increase in the measured heart parameters. Although a comparison of control and PDGF-AA-treated embryos showed no increase in the overall size of the heart, confocal microscopy showed an increase in the size and number of myofibrillar bundles in the developing myocardium. In addition, transmission electron microscopy (TEM) revealed an increase in the presence of sarcomeres, indicating that myofibrils were more highly differentiated in these areas of the treated embryos. In PDGF-BB-treated embryos, the compact zone of the myocardium was thicker and, as shown by confocal microscopy and TEM, f-actin and well-developed sarcomeres were more prevalent, indicating that the myofibrils were more differentiated in the treated embryos than in the control embryos. These studies indicate that increased exposure of embryonic hearts to PDGF-AA or -BB increases the rate of myocardial development.
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Affiliation(s)
- Robert L Price
- Department of Developmental Biology and Anatomy, School of Medicine, University of South Carolina, Columbia, South Carolina, USA
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47
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Bondjers C, Kalén M, Hellström M, Scheidl SJ, Abramsson A, Renner O, Lindahl P, Cho H, Kehrl J, Betsholtz C. Transcription profiling of platelet-derived growth factor-B-deficient mouse embryos identifies RGS5 as a novel marker for pericytes and vascular smooth muscle cells. THE AMERICAN JOURNAL OF PATHOLOGY 2003; 162:721-9. [PMID: 12598306 PMCID: PMC1868109 DOI: 10.1016/s0002-9440(10)63868-0] [Citation(s) in RCA: 171] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
All blood capillaries consist of endothelial tubes surrounded by mural cells referred to as pericytes. The origin, recruitment, and function of the pericytes is poorly understood, but the importance of these cells is underscored by the severe cardiovascular defects in mice genetically devoid of factors regulating pericyte recruitment to embryonic vessels, and by the association between pericyte loss and microangiopathy in diabetes mellitus. A general problem in the study of pericytes is the shortage of markers for these cells. To identify new markers for pericytes, we have taken advantage of the platelet-derived growth factor (PDGF)-B knockout mouse model, in which developing blood vessels in the central nervous system are almost completely devoid of pericytes. Using cDNA microarrays, we analyzed the gene expression in PDGF-B null embryos in comparison with corresponding wild-type embryos and searched for down-regulated genes. The most down-regulated gene present on our microarray was RGS5, a member of the RGS family of GTPase-activating proteins for G proteins. In situ hybridization identified RGS5 expression in brain pericytes, and in pericytes and vascular smooth muscle cells in certain other, but not all, locations. Absence of RGS5 expression in PDGF-B and PDGFR beta-null embryos correlated with pericyte loss in these mice. Residual RGS5 expression in rare pericytes suggested that RGS5 is a pericyte marker expressed independently of PDGF-B/R beta signaling. With RGS5 as a proof-of-principle, our data demonstrate the usefulness of microarray analysis of mouse models for abnormal pericyte development in the identification of new pericyte-specific markers.
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MESH Headings
- Animals
- Becaplermin
- Biomarkers
- DNA Fingerprinting
- Embryo, Mammalian
- Female
- GTP-Binding Proteins/genetics
- Gene Expression Regulation, Developmental
- Immunohistochemistry
- In Situ Hybridization
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/embryology
- Oligonucleotide Array Sequence Analysis
- Pericytes/cytology
- Platelet-Derived Growth Factor/deficiency
- Platelet-Derived Growth Factor/genetics
- Platelet-Derived Growth Factor/physiology
- Pregnancy
- Proto-Oncogene Proteins c-sis
- RGS Proteins/analysis
- RGS Proteins/genetics
- Receptor, Platelet-Derived Growth Factor beta/deficiency
- Receptor, Platelet-Derived Growth Factor beta/genetics
- Receptor, Platelet-Derived Growth Factor beta/physiology
- Transcription, Genetic
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Affiliation(s)
- Cecilia Bondjers
- Department of Medical Biochemistry, The Sahlgrenska Academy at Göteborg University, Göteborg, Sweden
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48
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Ruchatz H, Puttini M, Cleris L, Pilotti S, Gambacorti-Passerini C, Formelli F. Effect of imatinib on haematopoietic recovery following idarubicin exposure. Leukemia 2003; 17:298-304. [PMID: 12592326 DOI: 10.1038/sj.leu.2402800] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2002] [Accepted: 10/01/2002] [Indexed: 11/09/2022]
Abstract
SCF is a potent pro-proliferative cytokine crucial for haematopoiesis, which binds to c-kit and activates its tyrosine kinase activity. Inactivating mutations of either SCF or c-kit have been described in mice and lead to increased sensitivity to treatment with ionising radiation. Imatinib is a tyrosine kinase inhibitor with high affinity for c-Abl, PDGFR and c-kit. In this study we investigated the effect of concomitant administration of imatinib and idarubicin, an anthracycline with haematosuppressive activity, in nu/nu mice and murine bone marrow cells. Double-treated animals showed significantly increased mortality compared to mice that received imatinib or idarubicin alone only when idarubicin and imatinib were given simultaneously. The combined treatment induced a more severe neutropenia with a slower recovery when compared to mice treated with idarubicin alone. The myeloid metaplasia usually observed in the spleen after idarubicin treatment was absent in mice co-treated with imatinib. Bone marrow from double-treated animals also showed decreased numbers of megakaryocytes and myeloid precursor cells. In vitro culture of murine bone marrow cells in the presence of imatinib inhibited SCF-induced proliferation and recovery from treatment with idarubicin. Our results indicate that the simultaneous administration of imatinib enhances idarubicin-induced haematopoietic toxicity in vivo and in vitro.
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Affiliation(s)
- H Ruchatz
- Department of Experimental Oncology, The National Cancer Institute, Milan, Italy
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49
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Chui CMY, Li K, Yang M, Chuen CKY, Fok TF, Li CK, Yuen PMP. Platelet-derived growth factor up-regulates the expression of transcription factors NF-E2, GATA-1 and c-Fos in megakaryocytic cell lines. Cytokine 2003; 21:51-64. [PMID: 12670444 DOI: 10.1016/s1043-4666(02)00499-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Platelet-derived growth factor (PDGF) is a platelet alpha-granule protein. In previous reports, we demonstrated the expression of PDGF receptors on platelets and megakaryocytic cells and that PDGF enhanced the proliferation of megakaryocytic progenitor cells. In this study, we investigated the effects of PDGF on mRNA and protein expressions of megakaryocyte-associated transcription factors, c-Fos, GATA-1, NF-E2 and PU.1, in two human megakaryocytic cell lines CHRF-288-11 and DAMI. RT-PCR/Southern blot analysis and Real-time PCR demonstrated that PDGF increased the mRNA expression of c-Fos, GATA-1 and NF-E2, but not PU.1 in a dose- and time-dependent manner. The activation was confirmed at the protein level by Western blot analysis of both total cell and nuclear lysates. The addition of increasing concentrations of Tyrphostin AG1295, an inhibitor of PDGF receptor kinase, blocked the stimulatory effect of PDGF on the mRNA and protein expressions of these transcription factors. The up-regulation of c-Fos, GATA-1 and NF-E2 protein by PDGF was inhibited by actinomycin D and cycloheximide, suggesting that mRNA and protein synthesis might be involved in the mechanism. Our data suggest a direct stimulatory effect of PDGF on c-Fos, GATA-1 and NF-E2 expressions and we speculate that these transcription factors might be involved in the signal transduction of PDGF on the regulation of megakaryocytopoiesis.
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Affiliation(s)
- Cecilia Mei Yan Chui
- Department of Paediatrics, Prince of Wales Hospital, The Chinese University of Hong Kong, 6th Floor, Clinical Sciences Building, Shatin, N T, Hong Kong, People's Republic of China
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50
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Kozaki K, Kaminski WE, Tang J, Hollenbach S, Lindahl P, Sullivan C, Yu JC, Abe K, Martin PJ, Ross R, Betsholtz C, Giese NA, Raines EW. Blockade of platelet-derived growth factor or its receptors transiently delays but does not prevent fibrous cap formation in ApoE null mice. THE AMERICAN JOURNAL OF PATHOLOGY 2002; 161:1395-407. [PMID: 12368212 PMCID: PMC1867295 DOI: 10.1016/s0002-9440(10)64415-x] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Platelet-derived growth factor (PDGF) is a potent stimulant of smooth muscle cell migration and proliferation in culture. To test the role of PDGF in the accumulation of smooth muscle cells in vivo, we evaluated ApoE -/- mice that develop complex lesions of atherosclerosis. Fetal liver cells from PDGF-B-deficient embryos were used to replace the circulating cells of lethally irradiated ApoE -/- mice. One month after transplant, all monocytes in PDGF-B -/- chimeras are of donor origin (lack PDGF), and no PDGF-BB is detected in circulating platelets, primary sources of PDGF in lesions. Although lesion volumes are comparable in the PDGF-B +/+ and -/- chimeras at 35 weeks, lesions in PDGF-B -/- chimeras contain mostly macrophages, appear less mature, and have a reduced frequency of fibrous cap formation as compared with PDGF-B +/+ chimeras. However, after 45 weeks, smooth muscle cell accumulation in fibrous caps is indistinguishable in the two groups. Comparison of elicited peritoneal macrophages by RNase protection assay shows an altered cytokine and cytokine receptor profile in PDGF-B -/- chimeras. ApoE -/- mice were also treated for up to 50 weeks with a PDGF receptor antagonist that blocks all three PDGF receptor dimers. Blockade of the PDGF receptors similarly delays, but does not prevent, accumulation of smooth muscle and fibrous cap formation. Thus, elimination of PDGF-B from circulating cells or blockade of PDGF receptors does not appear sufficient to prevent smooth muscle accumulation in advanced lesions of atherosclerosis.
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Affiliation(s)
- Koichi Kozaki
- Department of Pathology, University of Washington School of Medicine, Seattle, Washington, USA
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