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Yombo DJK, Madala SK, Vemulapalli CP, Ediga HH, Hardie WD. Pulmonary fibroelastosis - A review. Matrix Biol 2023; 124:1-7. [PMID: 37922998 PMCID: PMC10841596 DOI: 10.1016/j.matbio.2023.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 10/11/2023] [Accepted: 10/31/2023] [Indexed: 11/07/2023]
Abstract
Elastin is a long-lived fibrous protein that is abundant in the extracellular matrix of the lung. Elastic fibers provide the lung the characteristic elasticity during inhalation with recoil during exhalation thereby ensuring efficient gas exchange. Excessive deposition of elastin and other extracellular matrix proteins reduces lung compliance by impairing ventilation and compromising gas exchange. Notably, the degree of elastosis is associated with the progressive decline in lung function and survival in patients with interstitial lung diseases. Currently there are no proven therapies which effectively reduce the elastin burden in the lung nor prevent dysregulated elastosis. This review describes elastin's role in the healthy lung, summarizes elastosis in pulmonary diseases, and evaluates the current understanding of elastin regulation and dysregulation with the goal of guiding future research efforts to develop novel and effective therapies.
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Affiliation(s)
- Dan J K Yombo
- Division of Pulmonary Medicine, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine Cincinnati, OH, USA
| | - Satish K Madala
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, University of Cincinnati, Cincinnati, Ohio USA
| | - Chanukya P Vemulapalli
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, University of Cincinnati, Cincinnati, Ohio USA
| | - Harshavardhana H Ediga
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, University of Cincinnati, Cincinnati, Ohio USA
| | - William D Hardie
- Division of Pulmonary Medicine, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine Cincinnati, OH, USA.
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2
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Farzamfar S, Elia E, Richer M, Chabaud S, Naji M, Bolduc S. Extracellular Matrix-Based and Electrospun Scaffolding Systems for Vaginal Reconstruction. Bioengineering (Basel) 2023; 10:790. [PMID: 37508817 PMCID: PMC10376078 DOI: 10.3390/bioengineering10070790] [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: 04/29/2023] [Revised: 06/14/2023] [Accepted: 06/22/2023] [Indexed: 07/30/2023] Open
Abstract
Congenital vaginal anomalies and pelvic organ prolapse affect different age groups of women and both have significant negative impacts on patients' psychological well-being and quality of life. While surgical and non-surgical treatments are available for vaginal defects, their efficacy is limited, and they often result in long-term complications. Therefore, alternative treatment options are urgently needed. Fortunately, tissue-engineered scaffolds are promising new treatment modalities that provide an extracellular matrix (ECM)-like environment for vaginal cells to adhere, secrete ECM, and be remodeled by host cells. To this end, ECM-based scaffolds or the constructs that resemble ECM, generated by self-assembly, decellularization, or electrospinning techniques, have gained attention from both clinicians and researchers. These biomimetic scaffolds are highly similar to the native vaginal ECM and have great potential for clinical translation. This review article aims to discuss recent applications, challenges, and future perspectives of these scaffolds in vaginal reconstruction or repair strategies.
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Affiliation(s)
- Saeed Farzamfar
- Centre de Recherche en Organogénèse Expérimentale/LOEX, Regenerative Medicine Division, CHU de Québec-Université Laval Research Center, Québec, QC G1J 1Z4, Canada
| | - Elissa Elia
- Centre de Recherche en Organogénèse Expérimentale/LOEX, Regenerative Medicine Division, CHU de Québec-Université Laval Research Center, Québec, QC G1J 1Z4, Canada
| | - Megan Richer
- Centre de Recherche en Organogénèse Expérimentale/LOEX, Regenerative Medicine Division, CHU de Québec-Université Laval Research Center, Québec, QC G1J 1Z4, Canada
| | - Stéphane Chabaud
- Centre de Recherche en Organogénèse Expérimentale/LOEX, Regenerative Medicine Division, CHU de Québec-Université Laval Research Center, Québec, QC G1J 1Z4, Canada
| | - Mohammad Naji
- Urology and Nephrology Research Center, Shahid Beheshti University of Medical Sciences, Tehran 1666677951, Iran
| | - Stéphane Bolduc
- Centre de Recherche en Organogénèse Expérimentale/LOEX, Regenerative Medicine Division, CHU de Québec-Université Laval Research Center, Québec, QC G1J 1Z4, Canada
- Department of Surgery, Faculty of Medicine, Laval University, Québec, QC G1V 0A6, Canada
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3
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Augustyniak A, Gottardi D, Giordani B, Gaffey J, Mc Mahon H. Dairy bioactives and functional ingredients with skin health benefits. J Funct Foods 2023. [DOI: 10.1016/j.jff.2023.105528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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4
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Procknow SS, Kozel BA. Emerging mechanisms of elastin transcriptional regulation. Am J Physiol Cell Physiol 2022; 323:C666-C677. [PMID: 35816641 PMCID: PMC9448287 DOI: 10.1152/ajpcell.00228.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/06/2022] [Accepted: 07/06/2022] [Indexed: 11/22/2022]
Abstract
Elastin provides recoil to tissues that stretch such as the lung, blood vessels, and skin. It is deposited in a brief window starting in the prenatal period and extending to adolescence in vertebrates, and then slowly turns over. Elastin insufficiency is seen in conditions such as Williams-Beuren syndrome and elastin-related supravalvar aortic stenosis, which are associated with a range of vascular and connective tissue manifestations. Regulation of the elastin (ELN) gene occurs at multiple levels including promoter activation/inhibition, mRNA stability, interaction with microRNAs, and alternative splicing. However, these mechanisms are incompletely understood. Better understanding of the processes controlling ELN gene expression may improve medicine's ability to intervene in these rare conditions, as well as to replace age-associated losses by re-initiating elastin production. This review describes what is known about the ELN gene promoter structure, transcriptional regulation by cytokines and transcription factors, and posttranscriptional regulation via mRNA stability and micro-RNA and highlights new approaches that may influence regenerative medicine.
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Affiliation(s)
- Sara S Procknow
- Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
| | - Beth A Kozel
- Translational Vascular Medicine Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
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5
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Karas A, Holmannova D, Borsky P, Fiala Z, Andrys C, Hamakova K, Svadlakova T, Palicka V, Krejsek J, Rehacek V, Esterkova M, Kovarikova H, Borska L. Significantly Altered Serum Levels of NAD, AGE, RAGE, CRP, and Elastin as Potential Biomarkers of Psoriasis and Aging—A Case-Control Study. Biomedicines 2022; 10:biomedicines10051133. [PMID: 35625870 PMCID: PMC9138308 DOI: 10.3390/biomedicines10051133] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 05/06/2022] [Accepted: 05/11/2022] [Indexed: 01/11/2023] Open
Abstract
Background: This study aims to investigate potential markers of psoriasis and aging, and to elucidate possible connections between these two processes. Methods: The serum samples of 60 psoriatic patients and 100 controls were analysed, and the levels of four selected parameters (AGEs, RAGE, NAD, and elastin) were determined using commercial ELISA kits. Serum C-reactive protein was assayed using an immune-nephelometry method. Findings: Among the patients, the levels of CRP, AGEs, and RAGE were all increased, while the levels of NAD were reduced when compared to the control group. A negative correlation between the levels of AGEs and NAD was found. A negative correlation between age and the NAD levels among the control group was observed, however among the patients the relationship was diminished. While there was no difference in the levels of native elastin between the patients and the controls, a positive correlation between the levels of native elastin and age and a negative correlation between the levels of native elastin and the severity of psoriasis were found. Conclusions: The results of our study support the notion of psoriasis and possibly other immune-mediated diseases accelerating the aging process through sustained systemic damage. The serum levels of CRP, NAD, AGEs, and RAGE appear to be promising potential biomarkers of psoriasis. The decrease in the serum levels of NAD is associated with (pro)inflammatory states. Our analysis indicates that the levels of native elastin might strongly reflect both the severity of psoriasis and the aging process.
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Affiliation(s)
- Adam Karas
- Institute of Preventive Medicine, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (A.K.); (D.H.); (Z.F.); (T.S.); (M.E.); (L.B.)
| | - Drahomira Holmannova
- Institute of Preventive Medicine, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (A.K.); (D.H.); (Z.F.); (T.S.); (M.E.); (L.B.)
| | - Pavel Borsky
- Institute of Preventive Medicine, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (A.K.); (D.H.); (Z.F.); (T.S.); (M.E.); (L.B.)
- Correspondence: ; Tel.: +420-495-816-386
| | - Zdenek Fiala
- Institute of Preventive Medicine, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (A.K.); (D.H.); (Z.F.); (T.S.); (M.E.); (L.B.)
| | - Ctirad Andrys
- Institute of Clinical Immunology and Allergology, University Hospital, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (C.A.); (J.K.)
| | - Kvetoslava Hamakova
- Clinic of Dermal and Venereal Diseases, University Hospital, 500 03 Hradec Kralove, Czech Republic;
| | - Tereza Svadlakova
- Institute of Preventive Medicine, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (A.K.); (D.H.); (Z.F.); (T.S.); (M.E.); (L.B.)
- Institute of Clinical Immunology and Allergology, University Hospital, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (C.A.); (J.K.)
| | - Vladimir Palicka
- Institute of Clinical Biochemistry and Diagnostics, University Hospital, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (V.P.); (H.K.)
| | - Jan Krejsek
- Institute of Clinical Immunology and Allergology, University Hospital, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (C.A.); (J.K.)
| | - Vit Rehacek
- Transfusion Center, University Hospital, 500 03 Hradec Kralove, Czech Republic;
| | - Monika Esterkova
- Institute of Preventive Medicine, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (A.K.); (D.H.); (Z.F.); (T.S.); (M.E.); (L.B.)
| | - Helena Kovarikova
- Institute of Clinical Biochemistry and Diagnostics, University Hospital, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (V.P.); (H.K.)
| | - Lenka Borska
- Institute of Preventive Medicine, Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic; (A.K.); (D.H.); (Z.F.); (T.S.); (M.E.); (L.B.)
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Ellis MW, Riaz M, Huang Y, Anderson CW, Luo J, Park J, Lopez CA, Batty LD, Gibson KH, Qyang Y. Epigallocatechin gallate facilitates extracellular elastin fiber formation in induced pluripotent stem cell derived vascular smooth muscle cells for tissue engineering. J Mol Cell Cardiol 2022; 163:167-174. [PMID: 34979103 PMCID: PMC8920537 DOI: 10.1016/j.yjmcc.2021.12.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 12/22/2021] [Accepted: 12/28/2021] [Indexed: 02/03/2023]
Abstract
Tissue engineered vascular grafts possess several advantages over synthetic or autologous grafts, including increased availability and reduced rates of infection and thrombosis. Engineered grafts constructed from human induced pluripotent stem cell derivatives further offer enhanced reproducibility in graft production. One notable obstacle to clinical application of these grafts is the lack of elastin in the vessel wall, which would serve to endow compliance in addition to mechanical strength. This study establishes the ability of the polyphenol compound epigallocatechin gallate, a principal component of green tea, to facilitate the extracellular formation of elastin fibers in vascular smooth muscle cells derived from human induced pluripotent stem cells. Further, this study describes the creation of a doxycycline-inducible elastin expression system to uncouple elastin production from vascular smooth muscle cell proliferative capacity to permit fiber formation in conditions conducive to robust tissue engineering.
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Affiliation(s)
- Matthew W Ellis
- Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06511, USA; Yale Stem Cell Center, New Haven, CT 06520, USA; Department of Cellular and Molecular Physiology, Yale University, New Haven, CT 06519, USA
| | - Muhammad Riaz
- Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06511, USA; Yale Stem Cell Center, New Haven, CT 06520, USA
| | - Yan Huang
- Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06511, USA; Yale Stem Cell Center, New Haven, CT 06520, USA
| | - Christopher W Anderson
- Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06511, USA; Yale Stem Cell Center, New Haven, CT 06520, USA; Department of Pathology, Yale University, New Haven, CT 06520, USA
| | - Jiesi Luo
- Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06511, USA; Yale Stem Cell Center, New Haven, CT 06520, USA
| | - Jinkyu Park
- Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06511, USA; Yale Stem Cell Center, New Haven, CT 06520, USA
| | - Colleen A Lopez
- Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06511, USA; Yale Stem Cell Center, New Haven, CT 06520, USA
| | - Luke D Batty
- Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06511, USA; Yale Stem Cell Center, New Haven, CT 06520, USA; Department of Pathology, Yale University, New Haven, CT 06520, USA
| | - Kimberley H Gibson
- Center for Cellular and Molecular Imaging: Electron Microscopy, Department of Cell Biology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Yibing Qyang
- Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06511, USA; Yale Stem Cell Center, New Haven, CT 06520, USA; Department of Pathology, Yale University, New Haven, CT 06520, USA; Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520, USA.
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7
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He Q, Shumate LT, Matthias J, Aydin C, Wein MN, Spatz JM, Goetz R, Mohammadi M, Plagge A, Divieti Pajevic P, Bastepe M. A G protein-coupled, IP3/protein kinase C pathway controlling the synthesis of phosphaturic hormone FGF23. JCI Insight 2019; 4:125007. [PMID: 31484825 PMCID: PMC6777913 DOI: 10.1172/jci.insight.125007] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 08/01/2019] [Indexed: 12/23/2022] Open
Abstract
Dysregulated actions of bone-derived phosphaturic hormone fibroblast growth factor 23 (FGF23) result in several inherited diseases, such as X-linked hypophosphatemia (XLH), and contribute substantially to the mortality in kidney failure. Mechanisms governing FGF23 production are poorly defined. We herein found that ablation of the Gq/11α-like, extralarge Gα subunit (XLαs), a product of GNAS, exhibits FGF23 deficiency and hyperphosphatemia in early postnatal mice (XLKO). FGF23 elevation in response to parathyroid hormone, a stimulator of FGF23 production via cAMP, was intact in XLKO mice, while skeletal levels of protein kinase C isoforms α and δ (PKCα and PKCδ) were diminished. XLαs ablation in osteocyte-like Ocy454 cells suppressed the levels of FGF23 mRNA, inositol 1,4,5-trisphosphate (IP3), and PKCα/PKCδ proteins. PKC activation in vivo via injecting phorbol myristate acetate (PMA) or by constitutively active Gqα-Q209L in osteocytes and osteoblasts promoted FGF23 production. Molecular studies showed that the PKC activation-induced FGF23 elevation was dependent on MAPK signaling. The baseline PKC activity was elevated in bones of Hyp mice, a model of XLH. XLαs ablation significantly, but modestly, reduced serum FGF23 and elevated serum phosphate in Hyp mice. These findings reveal a potentially hitherto-unknown mechanism of FGF23 synthesis involving a G protein-coupled IP3/PKC pathway, which may be targeted to fine-tune FGF23 levels.
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Affiliation(s)
- Qing He
- Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Lauren T. Shumate
- Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Julia Matthias
- Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Cumhur Aydin
- Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Endodontics, Gulhane Faculty of Dentistry, University of Health Sciences, Ankara, Turkey
| | - Marc N. Wein
- Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Jordan M. Spatz
- Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Regina Goetz
- Department of Biochemistry & Molecular Pharmacology, New York University School of Medicine, New York, New York, USA
| | - Moosa Mohammadi
- Department of Biochemistry & Molecular Pharmacology, New York University School of Medicine, New York, New York, USA
| | - Antonius Plagge
- Department of Cellular and Molecular Physiology, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
| | - Paola Divieti Pajevic
- Department of Molecular & Cell Biology, Boston University Goldman School of Dental Medicine, Boston, Massachusetts, USA
| | - Murat Bastepe
- Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
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8
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Hirose T, Shimazaki T, Takahashi N, Fukada T, Watanabe T, Tangkawattana P, Takehana K. Morphometric analysis of thoracic aorta in Slc39a13/Zip13-KO mice. Cell Tissue Res 2019; 376:137-141. [PMID: 30610452 DOI: 10.1007/s00441-018-2977-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 10/13/2018] [Indexed: 01/24/2023]
Abstract
Ehlers-Danlos syndrome (EDS) is a collection of inheritable diseases involving the musculoskeletal, integumentary and visual systems. Spondylodysplastic EDS-ZIP13 (spEDS-ZIP13: OMIM 612350) was recently defined as a new form of EDS. Although vasculitis has been found in many spEDS-ZIP13 patients, vascular pathology has not been included as a pathognomonic lesion of this type of EDS. We investigate the morphometry of the thoracic aorta in wild-type and Zip13-knockout (Zip13-KO) mice. Our assessment found abnormalities in the number and morphology of elastic and cellular components in the aortic wall, especially the tunica media, of Zip13-KO mice, indicating aortic fragility. Accordingly, our major findings (vascular smooth muscle cells with small nuclei, small percentage of elastic membrane area per tunica media, many large elastic flaps) should be considered vulnerable characteristics indicating fragility of the aorta in patients with spEDS-ZIP13.
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Affiliation(s)
- Takuya Hirose
- Laboratory of Anatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, 069-8501, Japan
| | - Takamasa Shimazaki
- Laboratory of Anatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, 069-8501, Japan
| | - Naoki Takahashi
- Laboratory of Anatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, 069-8501, Japan
| | - Toshiyuki Fukada
- Molecular and Cellular Physiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima, 770-8055, Japan
| | - Takafumi Watanabe
- Laboratory of Anatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, 069-8501, Japan
- Laboratory of Animal Functional Anatomy, Faculty of Agriculture, Shinshu University, Minami-minowa, Kami-ina, Nagano, 399-4598, Japan
| | - Prasarn Tangkawattana
- Laboratory of Anatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, 069-8501, Japan.
- Faculty of Veterinary Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand.
| | - Kazushige Takehana
- Laboratory of Anatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, 069-8501, Japan
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9
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Cocciolone AJ, Hawes JZ, Staiculescu MC, Johnson EO, Murshed M, Wagenseil JE. Elastin, arterial mechanics, and cardiovascular disease. Am J Physiol Heart Circ Physiol 2018; 315:H189-H205. [PMID: 29631368 DOI: 10.1152/ajpheart.00087.2018] [Citation(s) in RCA: 154] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Large, elastic arteries are composed of cells and a specialized extracellular matrix that provides reversible elasticity and strength. Elastin is the matrix protein responsible for this reversible elasticity that reduces the workload on the heart and dampens pulsatile flow in distal arteries. Here, we summarize the elastin protein biochemistry, self-association behavior, cross-linking process, and multistep elastic fiber assembly that provide large arteries with their unique mechanical properties. We present measures of passive arterial mechanics that depend on elastic fiber amounts and integrity such as the Windkessel effect, structural and material stiffness, and energy storage. We discuss supravalvular aortic stenosis and autosomal dominant cutis laxa-1, which are genetic disorders caused by mutations in the elastin gene. We present mouse models of supravalvular aortic stenosis, autosomal dominant cutis laxa-1, and graded elastin amounts that have been invaluable for understanding the role of elastin in arterial mechanics and cardiovascular disease. We summarize acquired diseases associated with elastic fiber defects, including hypertension and arterial stiffness, diabetes, obesity, atherosclerosis, calcification, and aneurysms and dissections. We mention animal models that have helped delineate the role of elastic fiber defects in these acquired diseases. We briefly summarize challenges and recent advances in generating functional elastic fibers in tissue-engineered arteries. We conclude with suggestions for future research and opportunities for therapeutic intervention in genetic and acquired elastinopathies.
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Affiliation(s)
- Austin J Cocciolone
- Department of Biomedical Engineering, Washington University , St. Louis, Missouri
| | - Jie Z Hawes
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
| | - Marius C Staiculescu
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
| | - Elizabeth O Johnson
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
| | - Monzur Murshed
- Faculty of Dentistry, Department of Medicine, and Shriners Hospital for Children, McGill University , Montreal, Quebec , Canada
| | - Jessica E Wagenseil
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
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10
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Tojais NF, Cao A, Lai YJ, Wang L, Chen PI, Alcazar MAA, de Jesus Perez VA, Hopper RK, Rhodes CJ, Bill MA, Sakai LY, Rabinovitch M. Codependence of Bone Morphogenetic Protein Receptor 2 and Transforming Growth Factor-β in Elastic Fiber Assembly and Its Perturbation in Pulmonary Arterial Hypertension. Arterioscler Thromb Vasc Biol 2017; 37:1559-1569. [PMID: 28619995 DOI: 10.1161/atvbaha.117.309696] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 05/26/2017] [Indexed: 02/07/2023]
Abstract
OBJECTIVE We determined in patients with pulmonary arterial (PA) hypertension (PAH) whether in addition to increased production of elastase by PA smooth muscle cells previously reported, PA elastic fibers are susceptible to degradation because of their abnormal assembly. APPROACH AND RESULTS Fibrillin-1 and elastin are the major components of elastic fibers, and fibrillin-1 binds bone morphogenetic proteins (BMPs) and the large latent complex of transforming growth factor-β1 (TGFβ1). Thus, we considered whether BMPs like TGFβ1 contribute to elastic fiber assembly and whether this process is perturbed in PAH particularly when the BMP receptor, BMPR2, is mutant. We also assessed whether in mice with Bmpr2/1a compound heterozygosity, elastic fibers are susceptible to degradation. In PA smooth muscle cells and adventitial fibroblasts, TGFβ1 increased elastin mRNA, but the elevation in elastin protein was dependent on BMPR2; TGFβ1 and BMP4, via BMPR2, increased extracellular accumulation of fibrillin-1. Both BMP4- and TGFβ1-stimulated elastic fiber assembly was impaired in idiopathic (I) PAH-PA adventitial fibroblast versus control cells, particularly those with hereditary (H) PAH and a BMPR2 mutation. This was related to profound reductions in elastin and fibrillin-1 mRNA. Elastin protein was increased in IPAH PA adventitial fibroblast by TGFβ1 but only minimally so in BMPR2 mutant cells. Fibrillin-1 protein increased only modestly in IPAH or HPAH PA adventitial fibroblasts stimulated with BMP4 or TGFβ1. In Bmpr2/1a heterozygote mice, reduced PA fibrillin-1 was associated with elastic fiber susceptibility to degradation and more severe pulmonary hypertension. CONCLUSIONS Disrupting BMPR2 impairs TGFβ1- and BMP4-mediated elastic fiber assembly and is of pathophysiologic significance in PAH.
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MESH Headings
- Animals
- Bone Morphogenetic Protein 4/pharmacology
- Bone Morphogenetic Protein Receptors, Type I/deficiency
- Bone Morphogenetic Protein Receptors, Type I/genetics
- Bone Morphogenetic Protein Receptors, Type II/deficiency
- Bone Morphogenetic Protein Receptors, Type II/genetics
- Bone Morphogenetic Protein Receptors, Type II/metabolism
- Case-Control Studies
- Cells, Cultured
- Disease Models, Animal
- Elastic Tissue/metabolism
- Elastic Tissue/pathology
- Elastic Tissue/physiopathology
- Elastin/genetics
- Elastin/metabolism
- Familial Primary Pulmonary Hypertension/genetics
- Familial Primary Pulmonary Hypertension/metabolism
- Familial Primary Pulmonary Hypertension/pathology
- Familial Primary Pulmonary Hypertension/physiopathology
- Fibrillin-1/genetics
- Fibrillin-1/metabolism
- Fibroblasts/drug effects
- Fibroblasts/metabolism
- Fibroblasts/pathology
- Genetic Predisposition to Disease
- Humans
- Hypertension, Pulmonary/genetics
- Hypertension, Pulmonary/metabolism
- Hypertension, Pulmonary/pathology
- Hypertension, Pulmonary/physiopathology
- Mice, 129 Strain
- Mice, Inbred C57BL
- Mice, Knockout
- Mutation
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Phenotype
- Pulmonary Artery/drug effects
- Pulmonary Artery/metabolism
- Pulmonary Artery/pathology
- Pulmonary Artery/physiopathology
- RNA Interference
- Transfection
- Transforming Growth Factor beta/pharmacology
- Vascular Remodeling
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Affiliation(s)
- Nancy F Tojais
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Aiqin Cao
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Ying-Ju Lai
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Lingli Wang
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Pin-I Chen
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Miguel A Alejandre Alcazar
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Vinicio A de Jesus Perez
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Rachel K Hopper
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Christopher J Rhodes
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Matthew A Bill
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Lynn Y Sakai
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.)
| | - Marlene Rabinovitch
- From the Department of Pediatrics (N.F.T., A.C., Y.-J.L., L.W., P.I.C., M.A.A.A., R.K.H., C.J.R., M.R.) and Department of Medicine (V.A.d.J.P., M.A.B.), the Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford University School of Medicine, CA; and Shriners Hospital for Children, Oregon Health & Science University, Portland (L.Y.S.).
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11
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Foote CA, Castorena-Gonzalez JA, Ramirez-Perez FI, Jia G, Hill MA, Reyes-Aldasoro CC, Sowers JR, Martinez-Lemus LA. Arterial Stiffening in Western Diet-Fed Mice Is Associated with Increased Vascular Elastin, Transforming Growth Factor-β, and Plasma Neuraminidase. Front Physiol 2016; 7:285. [PMID: 27458385 PMCID: PMC4935726 DOI: 10.3389/fphys.2016.00285] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 06/23/2016] [Indexed: 01/06/2023] Open
Abstract
Consumption of excess fat and carbohydrate (Western diet, WD) is associated with alterations in the structural characteristics of blood vessels. This vascular remodeling contributes to the development of cardiovascular disease, particularly as it affects conduit and resistance arteries. Vascular remodeling is often associated with changes in the elastin-rich internal elastic lamina (IEL) and the activation of transforming growth factor (TGF)-β. In addition, obesity and type II diabetes have been associated with increased serum neuraminidase, an enzyme known to increase TGF-β cellular output. Therefore, we hypothesized that WD-feeding would induce structural modifications to the IEL of mesenteric resistance arteries in mice, and that these changes would be associated with increased levels of circulating neuraminidase and the up-regulation of elastin and TGF-β in the arterial wall. To test this hypothesis, a WD, high in fat and sugar, was used to induce obesity in mice, and the effect of this diet on the structure of mesenteric resistance arteries was investigated. 4-week old, Post-weaning mice were fed either a normal diet (ND) or WD for 16 weeks. Mechanically, arteries from WD-fed mice were stiffer and less distensible, with marginally increased wall stress for a given strain, and a significantly increased Young's modulus of elasticity. Structurally, the wall cross-sectional area and the number of fenestrae found in the internal elastic lamina (IEL) of mesenteric arteries from mice fed a WD were significantly smaller than those of arteries from the ND-fed mice. There was also a significant increase in the volume of elastin, but not collagen in arteries from the WD cohort. Plasma levels of neuraminidase and the amount of TGF-β in mesenteric arteries were elevated in mice fed a WD, while ex vivo, cultured vascular smooth muscle cells exposed to neuraminidase secreted greater amounts of tropoelastin and TGF-β than those exposed to vehicle. These data suggest that consumption of a diet high in fat and sugar causes stiffening of the vascular wall in resistance arteries through a process that may involve increased neuraminidase and TGF-β activity, elevated production of elastin, and a reduction in the size and number of fenestrae in the arterial IEL.
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Affiliation(s)
| | - Jorge A. Castorena-Gonzalez
- Dalton Cardiovascular Research Center, University of MissouriColumbia, MO, USA
- Department of Biological Engineering, University of MissouriColumbia, MO, USA
| | - Francisco I. Ramirez-Perez
- Dalton Cardiovascular Research Center, University of MissouriColumbia, MO, USA
- Department of Biological Engineering, University of MissouriColumbia, MO, USA
| | - Guanghong Jia
- Diabetes and Cardiovascular Research Center, University of MissouriColumbia, MO, USA
- Harry S. Truman Memorial Veterans HospitalColumbia, MO, USA
| | - Michael A. Hill
- Dalton Cardiovascular Research Center, University of MissouriColumbia, MO, USA
- Department of Medical Pharmacology and Physiology, University of MissouriColumbia, MO, USA
| | | | - James R. Sowers
- Diabetes and Cardiovascular Research Center, University of MissouriColumbia, MO, USA
- Harry S. Truman Memorial Veterans HospitalColumbia, MO, USA
| | - Luis A. Martinez-Lemus
- Dalton Cardiovascular Research Center, University of MissouriColumbia, MO, USA
- Department of Biological Engineering, University of MissouriColumbia, MO, USA
- Department of Medical Pharmacology and Physiology, University of MissouriColumbia, MO, USA
- *Correspondence: Luis A. Martinez-Lemus
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12
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Hinderer S, Shena N, Ringuette LJ, Hansmann J, Reinhardt DP, Brucker SY, Davis EC, Schenke-Layland K. In vitro elastogenesis: instructing human vascular smooth muscle cells to generate an elastic fiber-containing extracellular matrix scaffold. ACTA ACUST UNITED AC 2015; 10:034102. [PMID: 25784676 DOI: 10.1088/1748-6041/10/3/034102] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Elastic fibers are essential for the proper function of organs including cardiovascular tissues such as heart valves and blood vessels. Although (tropo)elastin production in a tissue-engineered construct has previously been described, the assembly to functional elastic fibers in vitro using human cells has been highly challenging. In the present study, we seeded primary isolated human vascular smooth muscle cells (VSMCs) onto 3D electrospun scaffolds and exposed them to defined laminar shear stress using a customized bioreactor system. Increased elastin expression followed by elastin deposition onto the electrospun scaffolds, as well as on newly formed fibers, was observed after six days. Most interestingly, we identified the successful deposition of elastogenesis-associated proteins, including fibrillin-1 and -2, fibulin-4 and -5, fibronectin, elastin microfibril interface located protein 1 (EMILIN-1) and lysyl oxidase (LOX) within our engineered constructs. Ultrastructural analyses revealed a developing extracellular matrix (ECM) similar to native human fetal tissue, which is composed of collagens, microfibrils and elastin. To conclude, the combination of a novel dynamic flow bioreactor and an electrospun hybrid polymer scaffold allowed the production and assembly of an elastic fiber-containing ECM.
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Affiliation(s)
- Svenja Hinderer
- Department of Cell and Tissue Engineering, Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB), 70569 Stuttgart, Germany. Department of Women's Health, Research Institute for Women's Health, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
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13
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Xu ZC, Zhang Q, Li H. Differentiation of human hair follicle stem cells into endothelial cells induced by vascular endothelial and basic fibroblast growth factors. Mol Med Rep 2013; 9:204-10. [PMID: 24247660 DOI: 10.3892/mmr.2013.1796] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 11/11/2013] [Indexed: 11/06/2022] Open
Abstract
Hair follicle stem cells (HFSCs) possess powerful expansion and multi‑differentiation potential, properties that place them at the forefront of the field of tissue engineering and stem cell‑based therapy. The aim of the present study was to investigate the differentiation of human HFSCs (hHFSCs) into cells of an endothelial lineage. hHFSCs were expanded to the second passage in vitro and then induced by the addition of vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) to the culture medium. The expression levels of endothelial cell (EC)‑related markers, including von Willebrand factor (vWF), vascular endothelial cadherin (VE)‑cadherin and cluster of differentiation (CD)31, were detected by immunofluorescence staining, flow cytometric analysis and reverse transcription‑polymerase chain reaction. The hHFSCs expressed vWF, VE‑cadherin and CD31 when exposed to a differentiation medium, similar to the markers expressed by the human umbilical vein ECs. More significantly, differentiated cells were also able to take up low‑density lipoprotein. The data of the present study demonstrated that an efficient strategy may be developed for differentiating hHFSCs into ECs by stimulation with VEGF and bFGF. Thus, hHFSCs represent a novel cell source for vascular tissue engineering and studies regarding the treatment of various forms of ischaemic vascular disease.
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Affiliation(s)
- Zhi Cheng Xu
- Department of Plastic and Reconstructive Surgery, Shanghai 9th People's Hospital, School of Medicine, Shanghai JiaoTong University, Shanghai Key Laboratory of Tissue Engineering, National Tissue Engineering Center of China, Shanghai 200011, P.R. China
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14
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Xu ZC, Zhang Q, Li H. Human hair follicle stem cell differentiation into contractile smooth muscle cells is induced by transforming growth factor-β1 and platelet-derived growth factor BB. Mol Med Rep 2013; 8:1715-21. [PMID: 24084832 DOI: 10.3892/mmr.2013.1707] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2013] [Accepted: 09/23/2013] [Indexed: 11/06/2022] Open
Abstract
Smooth muscle cells (SMCs) are important in vascular homeostasis and disease and thus, are critical elements in vascular tissue engineering. Although adult SMCs have been used as seed cells, such mature differentiated cells suffer from limited proliferation potential and cultural senescence, particularly when originating from older donors. By comparison, human hair follicle stem cells (hHFSCs) are a reliable source of stem cells with multi-differentiation potential. The aim of the present study, was to develop an efficient strategy to derive functional SMCs from hHFSCs. hHFSCs were obtained from scalp tissues of healthy adult patients undergoing cosmetic plastic surgery. The hHFSCs were expanded to passage 2 and induced by the administration of transforming growth factor-β1 (TGF-β1) and platelet-derived growth factor BB (PDGF-BB) in combination with culture medium. Expression levels of SMC-related markers, including α-smooth muscle actin (α-SMA), α-calponin and smooth muscle myosin heavy chain (SM-MHC), were detected by immunofluorescence staining, flow cytometry analysis and reverse transcription-polymerase chain reaction (RT-PCR). When exposed to differentiation medium, hHFSCs expressed early, mid and late markers (α-SMA, α-calponin and SM-MHC, respectively) that were similar to the markers expressed by human umbilical artery SMCs. Notably, when entrapped inside a collagen matrix lattice, these SM differentiated cells showed a contractile function. Therefore, the present study developed an efficient strategy for differentiating hHFSCs into contractile SMCs by stimulation with TGF-β1 and PDGF-BB. The high yield of derivation suggests that this strategy facilitates the acquisition of the large numbers of cells that are required for blood vessel engineering and the study of vascular disease pathophysiology.
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Affiliation(s)
- Zhi Cheng Xu
- Department of Plastic and Reconstructive Surgery, Shanghai 9th People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, P.R. China
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15
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Urban Z, Davis EC. Cutis laxa: intersection of elastic fiber biogenesis, TGFβ signaling, the secretory pathway and metabolism. Matrix Biol 2013; 33:16-22. [PMID: 23954411 DOI: 10.1016/j.matbio.2013.07.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 07/08/2013] [Accepted: 07/09/2013] [Indexed: 12/11/2022]
Abstract
Cutis laxa (CL), a disease characterized by redundant and inelastic skin, displays extensive locus heterogeneity. Together with geroderma osteodysplasticum and arterial tortuosity syndrome, which show phenotypic overlap with CL, eleven CL-related genes have been identified to date, which encode proteins within 3 groups. Elastin, fibulin-4, fibulin-5 and latent transforming growth factor-β-binding protein 4 are secreted proteins which form elastic fibers and are involved in the sequestration and subsequent activation of transforming growth factor-β (TGFβ). Proteins within the second group, localized to the secretory pathway, perform transport and membrane trafficking functions necessary for the modification and secretion of elastic fiber components. Key proteins include a subunit of the vacuolar-type proton pump, which ensures the efficient secretion of tropoelastin, the precursor or elastin. A copper transporter is required for the activity of lysyl oxidases, which crosslink collagen and elastin. A Rab6-interacting goglin recruits kinesin motors to Golgi-vesicles facilitating the transport from the Golgi to the plasma membrane. The Rab and Ras interactor 2 regulates the activity of Rab5, a small guanosine triphosphatase essential for the endocytosis of various cell surface receptors, including integrins. Proteins of the third group related to CL perform metabolic functions within the mitochondria, inhibiting the accumulation of reactive oxygen species. Two of these proteins catalyze subsequent steps in the conversion of glutamate to proline. The third transports dehydroascorbate into mitochondria. Recent studies on CL-related proteins highlight the intricate connections among membrane trafficking, metabolism, extracellular matrix assembly, and TGFβ signaling.
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Affiliation(s)
- Zsolt Urban
- Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA 15261, United States.
| | - Elaine C Davis
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, H3A 0C7 Canada
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Liang MS, Koobatian M, Lei P, Swartz DD, Andreadis ST. Differential and synergistic effects of mechanical stimulation and growth factor presentation on vascular wall function. Biomaterials 2013; 34:7281-91. [PMID: 23810080 DOI: 10.1016/j.biomaterials.2013.05.073] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Accepted: 05/27/2013] [Indexed: 01/04/2023]
Abstract
We investigated the hypothesis that immobilizing TGF-β1 within fibrin hydrogels may act in synergy with cyclic mechanical stimulation to enhance the properties of vascular grafts. To this end, we engineered a fusion TGF-β1 protein that can covalently anchor to fibrin during polymerization upon the action of factor XIII. We also developed a 24-well based bioreactor in which vascular constructs can be mechanically stimulated by distending the silastic mandrel in the middle of each well. TGF-β1 was either conjugated to fibrin or supplied in the culture medium and the fibrin-based constructs were cultured statically for a week followed by cyclic distention for another week. The tissues were examined for myogenic differentiation, vascular reactivity, mechanical properties and ECM content. Our results showed that some aspects of vascular function were differentially affected by growth factor presentation vs. pulsatile force application, while others were synergistically enhanced by both. Overall, this two-prong biomimetic approach improved ECM secretion, vascular reactivity and mechanical properties of vascular constructs. These findings may be applied in other tissue engineering applications such as cartilage, tendon or cardiac regeneration where growth factors TGF-β1 and mechano-stimulation play critical roles.
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Affiliation(s)
- Mao-Shih Liang
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Amherst, NY 14260-4200, USA
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17
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Abstract
Underlying the dynamic regulation of tropoelastin expression and elastin formation in development and disease are transcriptional and post-transcriptional mechanisms that have been the focus of much research. Of particular importance is the cytokine-governed elastin regulatory axis in which the pro-elastogenic activities of transforming growth factor β-1 (TGFβ1) and insulin-like growth factor-I (IGF-I) are opposed by anti-elastogenic activities of basic fibroblast growth factor (bFGF/FGF-2), heparin-binding epidermal growth factor-like growth factor (HB-EGF), EGF, PDGF-BB, TGFα, tumor necrosis factor-alpha (TNF-α), interleukin (IL)-1β and noncanonical TGFβ1 signaling. A key mechanistic feature of the regulatory axis is that cytokines influence elastin formation through effects on the cell cycle involving control of cyclin-cyclin dependent kinase complexes and activation of the Ras/MEK/ERK signaling pathway. In this article we provide an overview of the major cytokines/growth factors that modulate elastogenesis and describe the underlying molecular mechanisms for their action on elastin production.
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Affiliation(s)
- Erin P Sproul
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA.
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18
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Papangeli I, Scambler PJ. Tbx1 genetically interacts with the transforming growth factor-β/bone morphogenetic protein inhibitor Smad7 during great vessel remodeling. Circ Res 2012; 112:90-102. [PMID: 23011393 DOI: 10.1161/circresaha.112.270223] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
RATIONALE Growth and remodeling of the pharyngeal arch arteries are vital for the development of a mature great vessel system. Dysmorphogenesis of the fourth arch arteries can result in interruption of the aortic arch type B, typically found in DiGeorge syndrome. Tbx1 haploinsufficient embryos, which model DiGeorge syndrome, display fourth arch artery defects during formation of the vessels. Recovery from such defects is a documented yet unexplained phenotype in Tbx1 haploinsufficiency. OBJECTIVE To understand the nature of fourth arch artery growth recovery in Tbx1 haploinsufficiency and its underlying genetic control. METHODS AND RESULTS We categorized vessel phenotypes of Tbx1 heterozygotes as hypoplastic or aplastic at the conclusion of pharyngeal artery formation and compared these against the frequency of vessel defects scored at the end of great vessel development. The frequency of hypoplastic vessels decreased during embryogenesis, whereas no reduction of vessel aplasia was seen, implying recovery is attributable to remodeling of hypoplastic vessels. We showed that Smad7, an inhibitory Smad within the transforming growth factor-β pathway, is regulated by Tbx1, is required for arch artery remodeling, and genetically interacts with Tbx1 in this process. Tbx1 and Tbx1;Smad7 haploinsufficiency affected several remodeling processes; however, concurrent haploinsufficiency particularly impacted on the earliest stage of vascular smooth muscle cell vessel coverage and subsequent fibronectin deposition. Conditional reconstitution of Smad7 with a Tbx1Cre driver indicated that the interaction between the 2 genes is cell autonomous. CONCLUSIONS Tbx1 acts upstream of Smad7 controlling vascular smooth muscle and extracellular matrix investment of the fourth arch artery.
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19
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Hagmeister U, Reuschlein K, März A, Wenck H, Gallinat S, Lucius R, Knott A. Poly(A) tail shortening correlates with mRNA repression in tropoelastin regulation. J Dermatol Sci 2012; 67:44-50. [DOI: 10.1016/j.jdermsci.2012.03.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 02/16/2012] [Accepted: 03/02/2012] [Indexed: 01/20/2023]
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20
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Lin S, Sandig M, Mequanint K. Three-dimensional topography of synthetic scaffolds induces elastin synthesis by human coronary artery smooth muscle cells. Tissue Eng Part A 2011; 17:1561-71. [PMID: 21284555 DOI: 10.1089/ten.tea.2010.0593] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Due to the important structural and signaling roles of elastin in vascular stability, engineered human vascular tissues must incorporate elastin. However, despite considerable progress toward engineering of elastin-containing vascular tissues from animal cells, currently engineered vascular tissues using human cells largely lack elastin. In this study, we evaluated the effect of scaffold topography (two dimensional [2D] vs. three dimensional [3D]) on elastogenesis in adult human coronary artery smooth muscle cells (HCASMCs). We report that elastin gene expression by HCASMCs was increased by twofold after 4 days of culture in porous 3D polyurethane scaffolds. Transforming growth factor β1 (TGF-β1) further increased elastin gene expression in 3D cultures but not in 2D cultures. To evaluate if gene expression is translated into elastin synthesis, both 2D and 3D cultures were analyzed using Western blots. We show that only HCASMCs in 3D scaffolds produced elastin, suggesting that scaffold geometry itself is an important cue for elastogenesis. Moreover, TGF-β1 enhanced elastin synthesis in 3D, but had no effect on cells grown on 2D surfaces. TGF-β1, known to induce vascular smooth muscle cells (VSMC) differentiation, upregulated contractile VSMC marker proteins smooth muscle-α-actin and calponin in cells on 2D surfaces. Interestingly, in 3D scaffolds, TGF-β1 failed to upregulate these differentiation marker proteins for at least 7 days, but did so in cells cultured for 14 days, whereas elastin synthesis was not affected. To our knowledge this study is the first to successfully demonstrate that adult human VSMC can produce elastin when seeded on 3D scaffolds and to directly compare the effect of scaffold topography on elastin synthesis. Knowledge about the conditions required to regulate the phenotype of human VSMCs is paramount to engineer elastin-containing autologous human vascular substitutes.
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Affiliation(s)
- Shigang Lin
- Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario, London, Ontario, Canada
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21
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Ott CE, Grünhagen J, Jäger M, Horbelt D, Schwill S, Kallenbach K, Guo G, Manke T, Knaus P, Mundlos S, Robinson PN. MicroRNAs differentially expressed in postnatal aortic development downregulate elastin via 3' UTR and coding-sequence binding sites. PLoS One 2011; 6:e16250. [PMID: 21305018 PMCID: PMC3031556 DOI: 10.1371/journal.pone.0016250] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Accepted: 12/11/2010] [Indexed: 01/06/2023] Open
Abstract
Elastin production is characteristically turned off during the maturation of elastin-rich organs such as the aorta. MicroRNAs (miRNAs) are small regulatory RNAs that down-regulate target mRNAs by binding to miRNA regulatory elements (MREs) typically located in the 3′ UTR. Here we show a striking up-regulation of miR-29 and miR-15 family miRNAs during murine aortic development with commensurate down-regulation of targets including elastin and other extracellular matrix (ECM) genes. There were a total of 14 MREs for miR-29 in the coding sequences (CDS) and 3′ UTR of elastin, which was highly significant, and up to 22 miR-29 MREs were found in the CDS of multiple ECM genes including several collagens. This overrepresentation was conserved throughout mammalian evolution. Luciferase reporter assays showed synergistic effects of miR-29 and miR-15 family miRNAs on 3′ UTR and coding-sequence elastin constructs. Our results demonstrate that multiple miR-29 and miR-15 family MREs are characteristic for some ECM genes and suggest that miR-29 and miR-15 family miRNAs are involved in the down-regulation of elastin in the adult aorta.
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Affiliation(s)
- Claus Eric Ott
- Institute for Medical Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Johannes Grünhagen
- Institute for Medical Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Marten Jäger
- Institute for Medical Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Berlin-Brandenburg Center for Regenerative Therapies (BCRT), Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Daniel Horbelt
- Institute for Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Simon Schwill
- Department of Cardiac Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Klaus Kallenbach
- Department of Cardiac Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Gao Guo
- Institute for Medical Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Thomas Manke
- Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Petra Knaus
- Institute for Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Stefan Mundlos
- Institute for Medical Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Berlin-Brandenburg Center for Regenerative Therapies (BCRT), Charité-Universitätsmedizin Berlin, Berlin, Germany
- Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Peter N. Robinson
- Institute for Medical Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Berlin-Brandenburg Center for Regenerative Therapies (BCRT), Charité-Universitätsmedizin Berlin, Berlin, Germany
- Max Planck Institute for Molecular Genetics, Berlin, Germany
- * E-mail:
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Choi WS, Mitsumoto A, Kochevar IE. Involvement of reactive oxygen species in TGF-beta1-induced tropoelastin expression by human dermal fibroblasts. Photochem Photobiol 2010; 85:1425-33. [PMID: 19709383 DOI: 10.1111/j.1751-1097.2009.00611.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chronic exposure to solar UV radiation causes marked changes in the dermal extracellular matrix that underlie the loss of resiliency and increased laxity observed in photoaged skin. In particular, the dermal elastin content increases substantially and the normal, well-organized elastic fibers are replaced by amorphous elastotic material. Transforming growth factor-beta1 (TGF-beta1) stimulates synthesis of elastin by dermal fibroblasts and may mediate the increase in elastin in chronically photodamaged skin. We investigated pathways involved in the TGF-beta1-induced increase in tropoelastin (TE), the soluble elastin monomer and assessed the role of reactive oxygen species (ROS) in the regulation of TE mRNA. Antioxidants and an inhibitor of NADPH oxidase blocked TGF-beta1-induced TE mRNA increase even when added 1.5 h after TGF-beta1, although ROS were detected for only 30 min. The TE mRNA increase required activation of Smad4, shown using Smad4 siRNA, and also involved the ERK1/2, p38 and JNK MAP kinases but not PI3K. ROS did not enhance signaling through Smad2 but did enhance activation of p38 and ERK1/2 at 10 min after TGF-beta1. These results indicate that Smad and MAPK pathways mediate TGF-beta1-induced TE expression and that ROS are required for both early signal transduction and later steps that increase elastin.
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Affiliation(s)
- Won Seon Choi
- Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, USA
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Le Saux O, Teeters K, Miyasato S, Choi J, Nakamatsu G, Richardson JA, Starcher B, Davis EC, Tam EK, Jourdan-Le Saux C. The role of caveolin-1 in pulmonary matrix remodeling and mechanical properties. Am J Physiol Lung Cell Mol Physiol 2008; 295:L1007-17. [PMID: 18849439 DOI: 10.1152/ajplung.90207.2008] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Caveolin-1 (cav1) is a 22-kDa membrane protein essential to the formation of small invaginations in the plasma membrane, called caveolae. The cav1 gene is expressed primarily in adherent cells such as endothelial and smooth muscle cells and fibroblasts. Caveolae contain a variety of signaling receptors, and cav1 notably downregulates transforming growth factor (TGF)-beta signal transduction. In pulmonary pathologies such as interstitial fibrosis or emphysema, altered mechanical properties of the lungs are often associated with abnormal ECM deposition. In this study, we examined the physiological functions and the deposition of ECM in cav1(-/-) mice at various ages (1-12 mo). Cav1(-/-) mice lack caveolae and by 3 mo of age have significant reduced lung compliance and increased elastance and airway resistance. Pulmonary extravasation of fluid, as part of the cav1(-/-) mouse phenotype, probably contributed to the alteration of compliance, which was compounded by a progressive increase in deposition of collagen fibrils in airways and parenchyma. We also found that the increased elastance was caused by abundant elastic fiber deposition primarily around airways in cav1(-/-) mice at least 3 mo old. These observed changes in the ECM composition probably also contribute to the increased airway resistance. The higher deposition of collagen and elastic fibers was associated with increased tropoelastin and col1alpha2 and col3alpha1 gene expression in lung tissues, which correlated tightly with increased TGF-beta/Smad signal transduction. Our study illustrates that perturbation of cav1 function may contribute to several pulmonary pathologies as the result of the important role played by cav1, as part of the TGF-beta signaling pathway, in the regulation of the pulmonary ECM.
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Affiliation(s)
- O Le Saux
- Univ. of Hawaii, John A. Burns School of Medicine, Dept. of Cell and Molecular Biology, 651 Ilalo St., BSB 222, Honolulu, HI 96813, USA
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Abstract
AIMS We hypothesized that hair-follicle stem cells can differentiate toward smooth contractile muscle cells, providing an autologous cell source for cardiovascular tissue regeneration. METHODS AND RESULTS Smooth muscle progenitor cells (SMPCs) were obtained from ovine hair follicles using a tissue-specific promoter and fluorescence-activated cell sorting. Hair-follicle smooth muscle progenitor cells (HF-SMPCs) expressed several markers of vascular smooth muscle including alpha-actin, calponin, myosin heavy chain (MHC), caldesmon, smoothelin, and SM22. HF-SMPCs were highly proliferative and showed high clonogenic potential without any signs of chromosomal abnormalities as evidenced by karyotype analysis. HF-SMPCs compacted fibrin hydrogels to a similar extent as vascular smooth muscle cells from ovine umbilical veins (V-SMCs), indicating the development of the force-generating machinery. In addition, cylindrical tissue equivalents prepared with HF-SMPCs displayed significant contractility in response to vasoactive agonists including KCl and the thromboxane A2 mimetic U46619, suggesting that these cells had developed receptor and non-receptor-mediated pathways of contractility. Finally, transforming growth factor-beta1 promoted differentiation of HF-SMPCs toward a mature SMC phenotype as suggested by increased expression of MHC and enhanced matrix compaction. CONCLUSION Our results suggest that hair follicles may be an easily accessible, autologous, and rich source of functional SMPC for cardiovascular tissue engineering and regenerative medicine.
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Affiliation(s)
- Jin Yu Liu
- Bioengineering Laboratory, Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, 908 Furnas Hall, North Campus, Amherst, NY 14260, USA
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Yang S, Nugent MA, Panchenko MP. EGF antagonizes TGF-beta-induced tropoelastin expression in lung fibroblasts via stabilization of Smad corepressor TGIF. Am J Physiol Lung Cell Mol Physiol 2008; 295:L143-51. [PMID: 18441095 DOI: 10.1152/ajplung.00289.2007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We previously reported that neutrophil elastase (NE) downregulates transforming growth factor-beta (TGF-beta)-maintained tropoelastin mRNA levels in lung fibroblasts through transactivation of the epidermal growth factor (EGF) receptor (EGFR)/Mek/Erk pathway, which is dependent on the NE-initiated release of soluble EGFR ligands. In the present study, we investigated the mechanism by which EGF downregulates tropoelastin expression. We found that EGF downregulates tropoelastin expression through inhibition of TGF-beta signaling. We show that EGF does not prevent the TGF-beta-induced nuclear accumulation of Smad2/3; rather, EGF stabilizes the short-lived Smad transcriptional corepressor TG-interacting factor (TGIF) via EGFR/Mek/Erk-mediated phosphorylation of TGIF. Elevation of TGIF levels, either by TGIF overexpression or prevention of TGIF degradation, is sufficient to inhibit TGF-beta-induced tropoelastin expression. Moreover, TGIF is essential for EGF-mediated downregulation of tropoelastin expression, inasmuch as small interfering RNA knockdown of TGIF blocked EGF-induced downregulation of tropoelastin. Finally, we demonstrated that NE treatment, which releases EGF-like growth factors, causes stabilization of TGIF through the EGFR/Mek/Erk pathway. These results suggest that EGFR/Mek/Erk signaling specifically antagonizes the proelastogenic action of TGF-beta in lung fibroblasts by stabilizing the Smad transcriptional corepressor TGIF.
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Affiliation(s)
- Shenghong Yang
- Department of Biochemistry, Boston University School of Medicine, 715 Albany St, Boston, Massachusetts 02118, USA
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26
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Kuang PP, Zhang XH, Rich CB, Foster JA, Subramanian M, Goldstein RH. Activation of elastin transcription by transforming growth factor-beta in human lung fibroblasts. Am J Physiol Lung Cell Mol Physiol 2007; 292:L944-52. [PMID: 17209135 DOI: 10.1152/ajplung.00184.2006] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Elastin synthesis is essential for lung development and postnatal maturation as well as for repair following injury. Using human embryonic lung fibroblasts that express undetectable levels of elastin as assessed by Northern analyses, we found that treatment with exogenous transforming growth factor-beta (TGF-beta) induced rapid and transient increases in levels of elastin heterogeneous nuclear RNA (hnRNA) followed by increases of elastin mRNA and protein expression. In fibroblasts derived from transgenic mice, TGF-beta induced increases in the expression of a human elastin gene promoter fragment driving a chloramphenicol acetyl transferase reporter gene. The induction of elastin hnRNA and mRNA expression by TGF-beta was abolished by pretreatments with TGF-beta receptor I inhibitor, global transcription inhibitor actinomycin D, and partially blocked by addition of protein synthesis inhibitor cycloheximide, but was not affected by the p44/42 MAPK inhibitor U0126. Pretreatment with the p38 MAPK inhibitor SB-203580 also partially attenuated the levels of TGF-beta-induced elastin mRNA but not its hnRNA. Western analysis indicated that TGF-beta stimulated Akt phosphorylation. Inhibition of phosphatidylinositol 3-kinase and Akt phosphorylation by LY-294002 abolished TGF-beta-induced increases in elastin hnRNA and mRNA expression. Treatment of lung fibroblasts with interleukin-1beta or the histone deacetylase inhibitor trichostatin A inhibited TGF-beta-induced elastin mRNA and hnRNA expression by a mechanism that involved inhibition of Akt phosphorylation. Downregulation of Akt2 but not Akt1 expression employing small interfering RNA duplexes blocked TGF-beta-induced increases of elastin hnRNA and mRNA levels. Together, our results demonstrated that TGF-beta activates elastin transcription that is dependent on phosphatidylinositol 3-kinase/Akt activity.
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Affiliation(s)
- Ping-Ping Kuang
- Pulmonary Center, Boston University School of Medicine, 80 E. Concord St., Boston, MA 02118, USA.
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Pierce RA, Moore CH, Arikan MC. Positive transcriptional regulatory element located within exon 1 of elastin gene. Am J Physiol Lung Cell Mol Physiol 2006; 291:L391-9. [PMID: 16899711 DOI: 10.1152/ajplung.00441.2004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Elastin gene transcription is cell type specific and developmentally regulated, but the promoter often exhibits relatively weak activity in transient transfections of cells that express elastin at high levels. To search for positive-acting regulatory sequences, we isolated genomic clones spanning the mouse elastin gene and extensive 5'- and 3'-flanking regions. Restriction fragments of potential regulatory regions were ligated 5' or 3' relative to the active promoter to test for enhancer activity in transient transfections of fetal rat lung fibroblasts, which express elastin at high levels, and distal lung epithelial cells, which do not express detectable elastin. Fragments of intron 1 did not exhibit significant enhancer activity. Inclusion of the 84-bp exon 1 and adjacent 5'-untranslated region increased activity of the elastin promoter approximately sixfold compared with parental constructs. Transfections with constructs of varying promoter length showed that as little as 40 bp of the 5' end of exon 1 confers enhanced activity in elastin-expressing rat lung fibroblasts, but these constructs had variable activity in lung epithelial cell lines. This region, localized between the transcription start site and extending into exon 1, binds Sp1 in nuclear extracts from elastin-expressing cells. These studies indicate a role for the 5' end of the first exon of the elastin gene in regulating strong transcriptional activity in elastogenic cells.
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Affiliation(s)
- Richard A Pierce
- Division of Pulmonary Medicine, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, USA.
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Qi J, Chi L, Maloney M, Yang X, Bynum D, Banes AJ. Interleukin-1β Increases Elasticity of Human Bioartificial Tendons. ACTA ACUST UNITED AC 2006; 12:2913-25. [PMID: 17518659 DOI: 10.1089/ten.2006.12.2913] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Stiffness is an important mechanical property of connective tissues, especially for tissues subjected to cyclic strain in vivo, such as tendons. Therefore, modulation of material properties of native or engineered tissues is an important consideration for tissue repair. Interleukin 1-beta (IL-1beta) is a cytokine most often associated in connective tissues with induction of matrix metalloproteinases and matrix destruction. However, IL-1beta may also be involved in constructive remodeling and confer a cell survival value to tenocytes. In this study, we investigated the effects of IL-1beta on the properties of human tenocyte-populated bioartificial tendons (BATs) fabricated in a novel three-dimensional (3D) culture system. IL-1beta treatment reduced the ultimate tensile strength and elastic modulus of BATs and increased the maximum strain. IL-1beta at low doses (1, 10 pM) upregulated elastin expression and at a high dose (100 pM) downregulated type I collagen expression. Matrix metalloproteinases, which are involved in matrix remodeling, were also upregulated by IL-1beta. The increased elasticity prevented BATs from rupture caused by applied strain. The results in this study suggest that IL-1beta may act as a defense/survival factor in response to applied mechanical loading. The balance between cell intrinsic strain and external matrix strain is important for maintaining the integrity of tendons.
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Affiliation(s)
- Jie Qi
- Flexcell International Corp., Hillsborough, North Carolina, USA
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Abstract
Transforming growth factor beta (TGF-beta) is a biologically multipotent regulatory protein implicated in functions that include the regulation of cellular growth, differentiation, extracellular matrix formation, and wound healing. It also plays a role in the pathologies of Alzheimer's disease, cancer and autoimmune disorders. TGF-beta modulates gene expression by affecting transcriptional activation and mRNA turnover rate. Steady-state mRNA levels depend on both the transcriptional activity and mRNA half-life. The stability of mRNA can be modified by the binding of trans-acting factors to cis-elements on the message. These can protect the mRNA from cleavage by RNAses, or they may promote mRNA cleavage. Changes in mRNA stability can lead to changes in the proteome and subsequently in cellular metabolism. The SMAD family of proteins has been implicated in the transduction of the TGF-beta signal, where they regulate transcriptional activity. This review attempts to provide new insights into the role played by TGF-beta in the regulation of mRNA turnover.
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30
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DiCamillo SJ, Yang S, Panchenko MV, Toselli PA, Naggar EF, Rich CB, Stone PJ, Nugent MA, Panchenko MP. Neutrophil elastase-initiated EGFR/MEK/ERK signaling counteracts stabilizing effect of autocrine TGF-beta on tropoelastin mRNA in lung fibroblasts. Am J Physiol Lung Cell Mol Physiol 2006; 291:L232-43. [PMID: 16473861 DOI: 10.1152/ajplung.00530.2005] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Neutrophil elastase (NE) plays an important role in emphysema, a pulmonary disease associated with excessive elastolysis and ineffective repair of interstitial elastin. Besides its direct elastolytic activity, NE releases soluble epidermal growth factor receptor (EGFR) ligands and initiates EGFR/MEK/ERK signaling to downregulate tropoelastin mRNA in neonatal rat lung fibroblasts (DiCamillo SJ, Carreras I, Panchenko MV, Stone PJ, Nugent MA, Foster JA, and Panchenko MP. J Biol Chem 277: 18938-18946, 2002). We now report that NE downregulates tropoelastin mRNA in the rat fetal lung fibroblast line RFL-6. The tropoelastin mRNA downregulation is preceded by release of EGF-like and TGF-alpha-like polypeptides and requires EGFR/MEK/ERK signaling, because it is prevented by the EGFR inhibitor AG1478 and the MEK/ERK uncoupler U0126. Tropoelastin expression in RFL-6 fibroblasts is governed by autocrine TGF-beta signaling, because TGF-beta type I receptor kinase inhibitor or TGF-beta neutralizing antibody dramatically decreases tropoelastin mRNA and protein levels. Half-life of tropoelastin mRNA in RFL-6 cells is >24 h, but it is decreased to approximately 8 h by addition of TGF-beta neutralizing antibody, EGF, TGF-alpha, or NE. Tropoelastin mRNA destabilization by NE, EGF, or TGF-alpha is abolished by AG1478 or U0126. EGF-dependent tropoelastin mRNA downregulation is reversed upon ligand withdrawal, whereas chronic EGF treatment leads to persistent downregulation of tropoelastin mRNA and protein levels and decreases insoluble elastin deposition. We conclude that NE-initiated EGFR/MEK/ERK signaling cascade overrides the autocrine TGF-beta signaling on tropoelastin mRNA stability and, therefore, decreases the elastogenic response in RFL-6 fibroblasts. We hypothesize that persistent EGFR/MEK/ERK signaling could impede the TGF-beta-induced elastogenesis/elastin repair in the chronically inflamed, elastase/anti-elastase imbalanced lung in emphysema.
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Affiliation(s)
- Sandra J DiCamillo
- Department of Biochemistry, Boston University School of Medicine, MA 02118, USA
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31
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Horstmeyer A, Licht C, Scherr G, Eckes B, Krieg T. Signalling and regulation of collagen I synthesis by ET-1 and TGF-beta1. FEBS J 2006; 272:6297-309. [PMID: 16336267 DOI: 10.1111/j.1742-4658.2005.05016.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Endothelin-1 (ET-1) plays an important role in tissue remodelling and fibrogenesis by inducing synthesis of collagen I via protein kinase C (PKC). ET-1 signals are transduced by two receptor subtypes, the ETA- and ETB-receptors which activate different Galpha proteins. Here, we investigated the expression of both ET-receptor subtypes in human primary dermal fibroblasts and demonstrated that the ETA-receptor is the major ET-receptor subtype expressed. To determine further signalling intermediates, we inhibited Galphai and three phospholipases. Pharmacologic inhibition of Galphai, phosphatidylcholine-phospholipase C (PC-PLC) and phospholipase D (PLD), but not of phospholipase Cbeta, abolished the increase in collagen I by ET-1. Inhibition of all phospholipases revealed similar effects on TGF-beta1 induced collagen I synthesis, demonstrating involvement of PC-PLC and PLD in the signalling pathways elicited by ET-1 and TGF-beta1. ET-1 and TGF-beta1 each stimulated collagen I production and in an additive manner. ET-1 further induced connective tissue growth factor (CTGF), as did TGF-beta1, however, to lower levels. While rapid and sustained CTGF induction was seen following TGF-beta1 treatment, ET-1 increased CTGF in a biphasic manner with lower induction at 3 h and a delayed and higher induction after 5 days of permanent ET-1 treatment. Coincidentally at 5 days of permanent ET-1 stimulation, a switch in ET-receptor subtype expression to the ETB-receptor was observed. We conclude that the signalling pathways induced by ET-1 and TGF-beta1 leading to augmented collagen I production by fibroblasts converge on a similar signalling pathway. Thereby, long-time stimulation by ET-1 resulted in a changed ET-receptor subtype ratio and in a biphasic CTGF induction.
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Howard PS, Kucich U, Coplen DE, He Y. Transforming growth factor-beta1–induced hypertrophy and matrix expression in human bladder smooth muscle cells. Urology 2005; 66:1349-53. [PMID: 16360482 DOI: 10.1016/j.urology.2005.06.124] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2005] [Revised: 06/01/2005] [Accepted: 06/24/2005] [Indexed: 12/01/2022]
Abstract
OBJECTIVES To determine whether transforming growth factor beta (TGF-beta) could activate hyperplasia, hypertrophy, and altered collagen expression in human detrusor smooth muscle cells (SMCs). METHODS Human bladder SMCs were treated in vitro with TGF-beta1 and analyzed for changes in both proliferative and hypertrophic responses by cell number and volume measurements, as well as for alterations in extracellular matrix gene and protein expression by Northern blot and enzyme-linked immunosorbent assay. RESULTS Proliferation of bladder SMCs was refractory to TGF-beta1, whereas the cells became hypertrophic upon TGF-beta1 treatment. The interstitial collagens, types I and III, were increased significantly in TGF-beta1-treated cultures in a dose-dependent manner. These increases were blocked in the presence of TGF-beta1 neutralizing antibody and also when cultures were treated with the protein synthesis inhibitor cycloheximide, indicating that new protein synthesis is necessary for upregulation of the interstitial collagens. Messenger ribonucleic acid transcripts for both the COL1A1 and COL3A1 genes were elevated at 4, 6, and 24 hours in TGF-beta1-treated cultures, preceding the expression of the collagenous protein, showing that TGF-beta1 effects on bladder smooth muscle occur, at least in part, at the transcriptional level. CONCLUSIONS These results indicate that human bladder SMCs have the potential to mediate both a hypertrophic and fibrotic response upon TGF-beta1 stimulation.
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Affiliation(s)
- Pamela S Howard
- Department of Anatomy and Cell Biology, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6030, USA.
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Colarossi C, Chen Y, Obata H, Jurukovski V, Fontana L, Dabovic B, Rifkin DB. Lung alveolar septation defects in Ltbp-3-null mice. THE AMERICAN JOURNAL OF PATHOLOGY 2005; 167:419-28. [PMID: 16049328 PMCID: PMC1603559 DOI: 10.1016/s0002-9440(10)62986-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Latent transforming growth factor (TGF)-beta binding proteins (LTBPs) modulate the secretion and activation of latent TGF-beta. To explore LTBP function in vivo, we created an Ltbp-3(-/-) mouse that has developmental emphysema with decreased septation in terminal alveoli. Differences in distal airspace enlargement were obvious at day 6 after birth. Secondary septation was inhibited, so by days 21 to 28 the mean linear intercept was approximately twofold greater in mutant versus control lungs. There were no differences in lung collagen and elastin, visualized by immunohistochemistry, or in myofibroblast numbers, determined by alpha-smooth muscle actin-positive cells, between mutant or wild-type lungs as the animals aged, other than differences associated with altered lung structure in mutant animals. However, from day 10 there was twice the number of alveolar type II cells in mutant alveoli compared to controls. At days 6 and 10, a transient enhancement in cell proliferation in the mutant lungs was observed by both 5-bromo-2'-deoxy-uridine and proliferating cell nuclear antigen labeling, accompanied by enhanced numbers of terminal dUTP nick-end labeling-positive cells at days 4, 6, and 10. Finally, there was a transient decrease in TGF-beta signaling at days 4 to 6 in Ltbp-3(-/-) lungs. These results indicate that in the absence of Ltbp-3, a temporary decrease in TGF-beta signaling in the lungs at days 4 to 6 alters cell proliferation, correlating with inhibition of septation and developmental emphysema.
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Affiliation(s)
- Cristina Colarossi
- Department of Cell Biology, NYU School of Medicine, 550 First Ave., MSB 638, New York, NY 10016, USA
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Chailley-Heu B, Boucherat O, Barlier-Mur AM, Bourbon JR. FGF-18 is upregulated in the postnatal rat lung and enhances elastogenesis in myofibroblasts. Am J Physiol Lung Cell Mol Physiol 2005; 288:L43-51. [PMID: 15447937 DOI: 10.1152/ajplung.00096.2004] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The fibroblast growth factors (FGFs) are key players in fetal lung development, but little is known about their status in postnatal lung. Here, we investigated the expression pattern of FGF-18 transcripts through the perinatal period and evidenced a sevenfold increase after birth that paralleled changes in elastin expression. In vitro, recombinant human (rh)FGF-18 had a mitogenic activity on day 21 fetal rat lung fibroblasts and stimulated its own expression in the latter, whereas FGF-2 inhibited it. At 50 or 100 ng/ml, rhFGF-18 increased the expression of α-smooth muscle actin (α-SMA; 2.5-fold), a characteristic marker of myofibroblasts, of tropoelastin (6.5-fold), of lysyl oxidase (2-fold), and of fibulins 1 and 5 (8- and 2.2-fold) in confluent fibroblasts isolated from fetal day 21 lung; similar results were obtained with fibroblasts from day 3 postnatal lungs. Elastin protein expression was also slightly increased in fetal fibroblasts. Lung analysis on day 4 in rat pups that had received rhFGF-18 (3 μg) on days 0 and 1 showed a 1.7-fold increase of tropoelastin transcripts, whereas α-SMA transcripts were unchanged. In contrast, rhFGF-2 markedly decreased expression of elastin in vitro and in vivo and of fibulin 5 in vitro. In addition, vitamin A, which is known to enhance alveolar development, elevated FGF-18 and elastin expressions in day 2 lungs, thus advancing the biological increase. We postulate that FGF-18 is involved in postnatal lung development through stimulating myofibroblast proliferation and differentiation.
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Affiliation(s)
- Bernadette Chailley-Heu
- Physiopathologie et Thérapeutique Respiratoires, Institut National de la Santé et de la Recherche Médicale U492, Faculté de Médecine, 94010 Créteil cedex, France.
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Massart F, Marini F, Menegato A, Del Monte F, Nuti M, Butitta F, Ferrari M, Balbarini A, Brandi ML. Allelic genes involved in artery compliance and susceptibility to sporadic abdominal aortic aneurysm. J Steroid Biochem Mol Biol 2004; 92:413-8. [PMID: 15698546 DOI: 10.1016/j.jsbmb.2004.10.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2004] [Indexed: 11/22/2022]
Abstract
Vascular smooth muscle cells (VSMCs) synthesize elastin (ELN), major protein of aortic tunica media which confers strength and elasticity to aortic wall. Protein loss or distortion is typical in aneurysm tunica media. Transforming growth factor beta1 (TGFbeta1) inhibits growth and connective protein expression of abdominal VSMCs cultures. Also, in atherogenic studies, estrogen (but not estrogen plus progestin) treatments inhibit aortic collagen accumulation and elastic loss, risk factors to subsequent aortic enlargement. Therefore, polymorphisms of ELN, estrogen receptor alpha (ERalpha) and beta (ERbeta), progesterone receptor (PR) and TGFbeta1 genes and their products may be involved in the abdominal aortic aneurysm (AAA) development. Using PCR-RFLP method, we analyzed ELN RmaI (exon 16), ERalphaPvuII-XbaI (intron 1), ERbetaAluI (exon 8), PR TaqI (intron 7) and TGFbeta1 Bsu36I (-509 bp, promoter) polymorphisms in 324 Caucasian male subjects: 225 healthy controls (mean age 71.20 +/- 6.85 years) and 99 unrelated AAA patients (mean age 69.8 +/- 7.1 years). No difference in ELN, ERalpha, PR and TGFbeta1 allele frequencies was observed in AAA patients versus controls (P > 0.05). However, because possessing at least an ERbetaAluI restriction site was statistically associated to AAA onset (chi(2) = 5.220; OR = 1.82, P < 0.05), ERbeta polymorphism was proposed as genetic determinant in the AAA susceptibility.
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Affiliation(s)
- Francesco Massart
- Pediatric Endocrine Center, Department of Pediatrics, University of Pisa, Via Roma 67, 56125 Pisa, Italy.
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Bunda S, Kaviani N, Hinek A. Fluctuations of intracellular iron modulate elastin production. J Biol Chem 2004; 280:2341-51. [PMID: 15537639 DOI: 10.1074/jbc.m409897200] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Production of insoluble elastin, the major component of elastic fibers, can be modulated by numerous intrinsic and exogenous factors. Because patients with hemolytic disorders characterized with fluctuations in iron concentration demonstrate defective elastic fibers, we speculated that iron might also modulate elastogenesis. In the present report we demonstrate that treatment of cultured human skin fibroblasts with low concentration of iron 2-20 microm (ferric ammonium citrate) induced a significant increase in the synthesis of tropoelastin and deposition of insoluble elastin. Northern blot and real-time reverse transcription-PCR analysis revealed that treatment with 20 microm iron led to an increase of approximately 3-fold in elastin mRNA levels. Because treatment with an intracellular iron chelator, desferrioxamine, caused a significant decrease in elastin mRNA level and consequent inhibition of elastin deposition, we conclude that iron facilitates elastin gene expression. Our experimental evidence also demonstrates the existence of an opposite effect, in which higher, but not cytotoxic concentrations of iron (100-400 microm) induced the production of intracellular reactive oxygen species that coincided with a significant decrease in elastin message stability and the disappearance of iron-dependent stimulatory effect on elastogenesis. This stimulatory elastogenic effect was reversed, however, in cultures simultaneously treated with high iron concentration (200 microm) and the intracellular hydroxyl radical scavenger, dimethylthiourea. Thus, presented data, for the first time, demonstrate the existence of two opposite iron-dependent mechanisms that may affect the steady state of elastin message. We speculate that extreme fluctuations in intracellular iron levels result in impaired elastic fiber production as observed in hemolytic diseases.
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Affiliation(s)
- Severa Bunda
- Cardiovascular Research Program, The Hospital for Sick Children and Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario M5G 1X8, Canada
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Buczek-Thomas JA, Lucey EC, Stone PJ, Chu CL, Rich CB, Carreras I, Goldstein RH, Foster JA, Nugent MA. Elastase Mediates the Release of Growth Factors from LungIn Vivo. Am J Respir Cell Mol Biol 2004; 31:344-50. [PMID: 15191913 DOI: 10.1165/rcmb.2003-0420oc] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Uncontrolled elastase activity is involved in the development of several types of lung disease. Previous reports demonstrated that growth factors are liberated from pulmonary matrix storage sites by elastase; however, release of these entities in vivo is not well defined. In the present study, we investigated the release of fibroblast growth factor-2 (FGF-2) and transforming growth factor-beta (TGF-beta), after intratracheal instillation of porcine pancreatic elastase into mice. We found that elastase promoted a time-dependent release of FGF-2 and TGF-beta1 from the lung into bronchoalveolar lavage (BAL) fluid. A large fraction of the TGF-beta1 in BAL fluid was in the active form (approximately 60%), suggesting that elastase might participate in the activation of TGF-beta1 from its latent form. Analysis of the levels of FGF-2 and TGF-beta1 in mouse blood indicated that the growth factors in BAL fluid were not entirely derived from blood. Moreover, elastase treatment of pulmonary fibroblasts cultures caused the release of TGF-beta1, suggesting that the TGF-beta1 in BAL fluid could have come from lung cells/matrix. Additional in vitro studies also indicated that TGF-beta1 plays a role in upregulating elastin mRNA levels. These data suggest that elastase releases growth factors from lung that participate in elastolytic injury responses.
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Affiliation(s)
- Jo Ann Buczek-Thomas
- Department of Biochemistry and the Pulmonary Center at Boston University School of Medicine, Boston, MA 02118, USA
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38
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Abstract
Atherosclerosis is characterized by inflammatory metabolic change with lipid accumulation in the artery. Atherosclerotic plaque occurs at discrete locations in the arterial system and involves the proliferation of smooth muscle cells (SMCs) together with imbalance of the extracellular matrix elements, elastic fiber in particular. The role of elastin in arterial development and disease was confirmed by generating mice that lack elastin. Thus, elastin is a critical regulatory molecule that regulates the phenotypic modulation, proliferation and migration of SMCs. We estimated that elastin expression and SMC proliferation are coupled inversely: potent stimulators of cell proliferation may potentially inhibit elastin expression and potent inhibitors of cell proliferation can stimulate elastin expression. Moreover, elastin was found to be expressed maximally at the G(0) and minimally at the G(2)/M phase during the cell cycle, suggesting that its expression is regulated by the cell growth state. The elastin peptide VPGVG enhanced SMC proliferation, resulting in the reduction of elastin expression. The inhibition of elastin expression by elastin fragments may be reflected in the negative feedback regulatory mechanism. The relationship between cell proliferation and elastin expression may be changed in atherosclerosis. Areas of atherosclerotic plaque show abnormality of elasticity and permeability from the viewpoint of the physiological function of the arterial wall. The etiology was estimated to be that cholesterol and calcium are deposited on the elastic fiber, resulting in decreased elastin synthesis and cross-linking formation. In addition, these dysfunctions of elastin fiber are also associated, in that the down-regulation of elastin and its related components (fibrillin-1 and lysyl oxidase) are directly related to calcification in SMCs. The denatured arterial elastin by cholesterol and calcium accumulation was also susceptible to proteolytic enzymes such as elastase and matrix metalloproteinase (MMP). Therefore, metabolic change in elastic fiber induces decreased elasticity and is associated with essential hypertension. Vitamin K(2) is used in drug therapy against atherosclerosis, or calcification in diabetes mellitus or dialysis, due to its promotion of the carboxylation of the matrix Gla protein.
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Affiliation(s)
- Yoshiyuki Seyama
- Department of Clinical Chemistry, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo, Japan.
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39
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Abstract
A malignant process interferes with the normal 'programme' of extracellular matrix biosynthesis and can modify extensively the structure and composition of the matrix. This effect appears to be attributable to several processes such as direct production of some selected matrix macromolecules by malignant cells or indirectly by the production of factors by malignant cells interfering with the regulation of normal matrix production. Other possibilities may also exist, such as the direct action of an environmental carcinogen on otherwise normal mesenchymal cells. The result is a more or less profound modification of tissue structure and composition with possible feedback effects on the malignant process. Some examples will be discussed such as elastin production by some tumours as well as the biosynthesis of some other selected matrix macromolecules as tenascin and osteopontin by breast tumours. Although the detailed mechanisms of these specific matrix productions is not yet completely elucidated, the rapidly increasing knowledge on the regulation of specific matrix production process and deranged matrix production might represent a new area of crosstalk between cancer research and matrix biology.
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Affiliation(s)
- Anna Kadar
- 2nd Department of Pathology, Semmelweis University of Medicine, Ulloi ut 93, 1091 Budapest, Hungary.
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40
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DiCamillo SJ, Carreras I, Panchenko MV, Stone PJ, Nugent MA, Foster JA, Panchenko MP. Elastase-released epidermal growth factor recruits epidermal growth factor receptor and extracellular signal-regulated kinases to down-regulate tropoelastin mRNA in lung fibroblasts. J Biol Chem 2002; 277:18938-46. [PMID: 11889128 DOI: 10.1074/jbc.m200243200] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Elastase/anti-elastase imbalance is a hallmark of emphysema, a chronic obstructive pulmonary disease associated with the rupture and inefficient repair of interstitial elastin. We report that neutrophil elastase (NE) at low physiologic concentrations, ranging from 35 nm to 1 microm, invokes transient, peaking at 15 min, activation of extracellular signal-regulated kinases 1 and 2 (ERK) in elastogenic lung fibroblasts. ERK activation is preceded by the release of soluble 25-26-kDa forms of epidermal growth factor (EGF) and transactivation of EGF receptor (EGFR) in NE-exposed cells. The stimulatory effect of NE on ERK is abrogated in the presence of anti-EGF-neutralizing antibodies, EGFR tyrosine kinase inhibitor (AG1478), and ERK kinase inhibitor (PD98059), as well as abolished in both EGFR-desensitized and endocytosis-arrested fibroblasts. Nuclear accumulation of activated ERK is associated with transient, peaking at 30 min, induction of c-Fos and sustained, observed at 24-48 h, decrease of tropoelastin mRNA levels in NE-challenged cells. Pretreatment of fibroblasts with AG1478 or PD98059 abrogates the NE-initiated tropoelastin mRNA suppression. We conclude that proteolytically released EGF signals directly via EGFR and ERK to down-regulate tropoelastin mRNA in NE-challenged lung fibroblasts.
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Affiliation(s)
- Sandra J DiCamillo
- Department of Biochemistry, Boston University School of Medicine, Boston, Massachusetts 02118, USA
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41
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Kucich U, Rosenbloom JC, Abrams WR, Rosenbloom J. Transforming growth factor-beta stabilizes elastin mRNA by a pathway requiring active Smads, protein kinase C-delta, and p38. Am J Respir Cell Mol Biol 2002; 26:183-8. [PMID: 11804868 DOI: 10.1165/ajrcmb.26.2.4666] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Transforming growth factors (TGFs)-beta are multipotent in their biologic activity, regulating cell growth and differentiation as well as extracellular matrix deposition and degradation. Most of these activities involve modulation of gene transcription, but TGF-beta1 has been shown previously to substantially increase the expression of elastin by stabilization of tropoelastin mRNA through a signaling pathway that likely involves a phosphatidylcholine-specific phospholipase C, a protein kinase C, prenylated and acylated protein(s), and one or more tyrosine kinases. However, there is a 4- to 6-h lag period after the addition of TGF-beta1 before significant stimulation of elastin expression is observed and the question of whether the Smads are involved has not been addressed. In the present work, using cultured human fetal lung fibroblasts, we show through the use of specific inhibitors and transfection of a Smad 7 construct that in addition to de novo protein synthesis and active Smads, the extended activity of protein kinase C (PKC)-delta and the stress-activated protein kinase, p38, is required for TGF-beta1 to achieve elastin mRNA stabilization.
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Affiliation(s)
- Umberto Kucich
- Department of Anatomy and Histology, University of Pennsylvania School of Dental Medicine, 4010 Locust, Philadelphia, PA 19104, USA
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42
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Affiliation(s)
- Jeffrey M Davidson
- Department of Pathology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-2561, USA.
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43
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Jimenez SA, Gaidarova S, Saitta B, Sandorfi N, Herrich DJ, Rosenbloom JC, Kucich U, Abrams WR, Rosenbloom J. Role of protein kinase C-δ in the regulation of collagen gene expression in scleroderma fibroblasts. J Clin Invest 2001. [DOI: 10.1172/jci200112347] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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44
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Jimenez SA, Gaidarova S, Saitta B, Sandorfi N, Herrich DJ, Rosenbloom JC, Kucich U, Abrams WR, Rosenbloom J. Role of protein kinase C-delta in the regulation of collagen gene expression in scleroderma fibroblasts. J Clin Invest 2001; 108:1395-403. [PMID: 11696585 PMCID: PMC209435 DOI: 10.1172/jci12347] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Working with cultured dermal fibroblasts derived from control individuals and patients with systemic sclerosis (SSc), we have examined the effects of protein kinase C-delta (PKC-delta) on type I collagen biosynthesis and steady-state levels of COL1A1 and COL3A1 mRNAs. Rottlerin, a specific inhibitor of PKC-delta, exerted a powerful, dose-dependent inhibition of type I and type III collagen gene expression in normal and SSc cells. Optimal rottlerin concentrations caused a 70-90% inhibition of type I collagen production, a >80% reduction in COL1A1 mRNA, and a >70% reduction in COL3A1 mRNA in both cell types. In vitro nuclear transcription assays and transient transfections with COL1A1 promoter deletion constructs demonstrated that rottlerin profoundly reduced COL1A1 transcription and that this effect required a 129-bp promoter region encompassing nucleotides -804 to -675. This COL1A1 segment imparted rottlerin sensitivity to a heterologous promoter. Cotransfections of COL1A1 promoter constructs with a dominant-negative PKC-delta expression plasmid showed that suppression of this kinase silenced COL1A1 promoter activity. The results indicate that PKC-delta participates in the upregulation of collagen gene transcription in SSc and suggest that treatment with PKC-delta inhibitors could suppress fibrosis in this disease.
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MESH Headings
- Acetophenones/metabolism
- Benzopyrans/metabolism
- Blotting, Western
- Cell Nucleus/metabolism
- Cells, Cultured
- Cloning, Molecular
- Collagen/biosynthesis
- Collagen/metabolism
- Collagen Type I/metabolism
- Collagen Type I, alpha 1 Chain
- Collagen Type III/metabolism
- Dose-Response Relationship, Drug
- Fibroblasts/enzymology
- Fibroblasts/metabolism
- Gene Expression Regulation
- Genes, Dominant
- Humans
- Isoenzymes/physiology
- Microscopy, Fluorescence
- Plasmids/metabolism
- Promoter Regions, Genetic
- Protein Kinase C/physiology
- Protein Kinase C-delta
- RNA, Messenger/metabolism
- Scleroderma, Systemic/enzymology
- Scleroderma, Systemic/metabolism
- Time Factors
- Transcription, Genetic
- Transfection
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Affiliation(s)
- S A Jimenez
- Division of Rheumatology, Department of Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania 19107-5541, USA.
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45
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Kucich U, Rosenbloom JC, Herrick DJ, Abrams WR, Hamilton AD, Sebti SM, Rosenbloom J. Signaling events required for transforming growth factor-beta stimulation of connective tissue growth factor expression by cultured human lung fibroblasts. Arch Biochem Biophys 2001; 395:103-12. [PMID: 11673871 DOI: 10.1006/abbi.2001.2571] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
It is possible that many of the fibrogenic effects of transforming growth factor-beta (TGF-beta) are mediated by connective tissue growth factor (CTGF). In the present work, we show that TGF-beta1 produces a 5- to 6-fold increase in CTGF expression by cultured human lung fibroblasts that is due mainly to increased transcription. The half-life of CTGF mRNA is 1.96 h, consistent with its role as a cytokine. In addition to requiring Smad activity, based upon the effects of specific inhibitors, the TGF-beta intracellular signaling pathway requires the activity of a phosphatidylcholine-specific phospholipase C, a protein kinase C, and one or more tyrosine kinases. It is also likely that the pathway requires a member of the Ras superfamily of small GTPases, but not trimeric G proteins. Pharmacologic inhibition of TGF-beta stimulation of CTGF expression may be an effective therapeutic approach to a variety of undesirable fibrotic reactions.
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Affiliation(s)
- U Kucich
- Department of Anatomy and Histology, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania 19104, USA
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46
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Stenmark KR. Cell-, age-, and phenotype-dependent differences in the control of gene expression. Am J Physiol Lung Cell Mol Physiol 2001; 281:L762-5. [PMID: 11557579 DOI: 10.1152/ajplung.2001.281.4.l762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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47
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Billings PC, Herrick DJ, Kucich U, Engelsberg BN, Abrams WR, Macarak EJ, Rosenbloom J, Howard PS. Extracellular matrix and nuclear localization of beta ig-h3 in human bladder smooth muscle and fibroblast cells. J Cell Biochem 2000; 79:261-73. [PMID: 10967553 DOI: 10.1002/1097-4644(20001101)79:2<261::aid-jcb90>3.0.co;2-#] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The extracellular matrix (ECM) plays an essential role in bladder structure and function. In this study, expression of beta ig-h3, a recently identified extracellular matrix protein, was investigated in human bladder tissue, and human bladder smooth-muscle (SMC) and fibroblast cells in vitro. SMCs secreted greater than three times the level of this protein compared with fibroblasts. The relative levels of beta ig-h3 mRNA in the two cell types reflected the protein expression. Immunohistochemical analysis demonstrated protein deposition in the ECM as well as cytoplasmic localization and, unexpectedly, nuclei. Anti-beta ig-h3 antibodies also stained the matrix surrounding the detrusor SMCs and nuclei of bladder fibroblasts, SMCs, and urothelium in intact bladder tissue. Western blot analyses of medium and matrix fractions obtained from cells in vitro revealed protein of approximately 70-74 kDa, whereas nuclear extracts contained a 65-kDa reactive protein band. We propose that although this protein is a structural component of bladder ECM, its nuclear localization suggests that it has other regulatory and/or structural functions.
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Affiliation(s)
- P C Billings
- Department of Anatomy and Histology, University of Pennsylvania, School of Dental Medicine, Philadelphia, Pennsylvania 19104, USA.
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48
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Rosenbloom J, Saitta B, Gaidarova S, Sandorfi N, Rosenbloom JC, Abrams WR, Hamilton AD, Sebti SM, Kucich U, Jimenez SA. Inhibition of type I collagen gene expression in normal and systemic sclerosis fibroblasts by a specific inhibitor of geranylgeranyl transferase I. ARTHRITIS AND RHEUMATISM 2000; 43:1624-32. [PMID: 10902768 DOI: 10.1002/1529-0131(200007)43:7<1624::aid-anr28>3.0.co;2-e] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE To examine the effects of specific inhibition of geranylgeranyl transferase I on the expression of types I and III collagen genes in normal and systemic sclerosis (SSc) dermal fibroblasts in vitro. METHODS Fibroblasts from 2 normal subjects and 4 SSc patients were incubated with 2-10 microM of GGTI-298, a specific geranylgeranyl transferase inhibitor. Type I collagen and fibronectin production were determined by enzyme-linked immunosorbent assay. Steady-state messenger RNA (mRNA) levels for alpha1(I), alpha2(I), and alpha1(III) collagens and fibronectin were assessed by Northern hybridization, and the transcription of the alpha1(I) collagen gene was examined by transient transfections with a reporter construct containing -5.3 kb of the gene. RESULTS GGTI-298 caused a dose-dependent inhibition of type I collagen production and a reduction in the steady-state levels of alpha1(I), alpha2(I), and alpha1(III) mRNA in normal and SSc cells. A 60-70% inhibition of type I collagen production and a 70-80% reduction in the mRNA levels for alpha1(I), alpha2(I), and alpha1(III) were observed at 10 microM GGTI-298. In contrast, the expression of fibronectin, cyclooxygenase 1, and GAPDH was not affected. The effects on alpha1(I) collagen mRNA resulted from a profound reduction in transcription of the alpha1(I) collagen gene promoter. GGTI-298 did not affect cellular viability or morphology. CONCLUSION These results demonstrate that specific inhibition of geranylgeranyl prenylation causes a potent and selective inhibition of expression of the genes encoding types I and III collagens, without affecting cellular viability. The findings indicate that inhibition of geranylgeranyl prenylation should be further studied as a potential therapeutic approach for SSc and other fibrosing diseases.
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Affiliation(s)
- J Rosenbloom
- University of Pennsylvania School of Dental Medicine, Philadelphia, USA
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49
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Abstract
Primary open angle glaucoma is a common eye disease characterized by loss of the axons of the retinal ganglion cells leading to progressive loss of vision. The site of damage to the axons is at the level of the lamina cribrosa in the optic nerve head. The mechanism of axonal loss is unknown but elevated intraocular pressure and age are the most common factors associated with the disease. Previous studies in human glaucoma and in experimental glaucoma in monkeys have established a relationship between chronic elevation of intraocular pressure and remodeling of the optic nerve head tissues known clinically as cupping of the optic disc. This review focuses on the astrocytes, the major cell type in the optic nerve head. Astrocytes participate actively in the remodeling of neural tissues during development and in disease. In glaucomatous optic neuropathy, astrocytes play a major role in the remodeling of the extracellular matrix of the optic nerve head, synthesize growth factors and other cellular mediators that may affect directly, or indirectly, the axons of the retinal ganglion cells. Due to the architecture of the lamina cribrosa, formed by the cells and the fibroelastic extracellular matrix, astrocytes may respond to changes in intraocular pressure in glaucoma, leading to some of the detrimental events that underlie axonal loss and retinal ganglion cell degeneration.
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Affiliation(s)
- M R Hernandez
- Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA.
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50
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Billings PC, Herrick DJ, Howard PS, Kucich U, Engelsberg BN, Rosenbloom J. Expression of betaig-h3 by human bronchial smooth muscle cells: localization To the extracellular matrix and nucleus. Am J Respir Cell Mol Biol 2000; 22:352-9. [PMID: 10696072 DOI: 10.1165/ajrcmb.22.3.3732] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Bronchial smooth muscle cells play a central role in normal lung physiology by controlling airway tone. In addition, airway smooth muscle hyperplasia and hypertrophy are important factors in the pathophysiology of asthma. In this study, expression of betaig-h3, a recently identified component of the extracellular matrix (ECM), was investigated in primary human bronchial smooth muscle (HBSM) cells. Northern blot analysis demonstrated that treatment of cultured HBSM cells with transforming growth factor-beta1 resulted in a 4- to 5-fold increase in the steady-state level of betaig-h3 messenger RNA. Western blot analysis of secreted proteins using monospecific antibodies generated against peptide sequences found in the N- and C-terminal regions of the protein identified several isoforms having apparent mass of 70-74 kD. Immunohistochemical analysis of human lung localized betaig-h3 to the vascular and airway ECM, and particularly to the septal tips of alveolar ducts and alveoli, suggesting that it may have a morphogenetic role. Analysis of cultured HBSM cells identified betaig-h3 in both the ECM as well as the cytoplasm, and surprisingly also in the nucleus. These results demonstrate that betaig-h3 is produced by resident lung cells, is a component of lung ECM, and may play an important role in lung structure and function. The presence of this protein in nuclei suggests that it may have regulatory functions in addition to its role as a structural component of lung ECM.
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Affiliation(s)
- P C Billings
- Department of Anatomy and Histology, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6002, USA.
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