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Mamazhakypov A, Sartmyrzaeva M, Sarybaev AS, Schermuly R, Sydykov A. Clinical and Molecular Implications of Osteopontin in Heart Failure. Curr Issues Mol Biol 2022; 44:3573-3597. [PMID: 36005141 PMCID: PMC9406846 DOI: 10.3390/cimb44080245] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/04/2022] [Accepted: 08/08/2022] [Indexed: 11/16/2022] Open
Abstract
The matricellular protein osteopontin modulates cell-matrix interactions during tissue injury and healing. A complex multidomain structure of osteopontin enables it not only to bind diverse cell receptors but also to interact with various partners, including other extracellular matrix proteins, cytokines, and growth factors. Numerous studies have implicated osteopontin in the development and progression of myocardial remodeling in diverse cardiac diseases. Osteopontin influences myocardial remodeling by regulating extracellular matrix production, the activity of matrix metalloproteinases and various growth factors, inflammatory cell recruitment, myofibroblast differentiation, cardiomyocyte apoptosis, and myocardial vascularization. The exploitation of osteopontin loss- and gain-of-function approaches in rodent models provided an opportunity for assessment of the cell- and disease-specific contribution of osteopontin to myocardial remodeling. In this review, we summarize the recent knowledge on osteopontin regulation and its impact on various cardiac diseases, as well as delineate complex disease- and cell-specific roles of osteopontin in cardiac pathologies. We also discuss the current progress of therapeutics targeting osteopontin that may facilitate the development of a novel strategy for heart failure treatment.
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Affiliation(s)
- Argen Mamazhakypov
- Department of Internal Medicine, German Center for Lung Research (DZL), Justus Liebig University of Giessen, 35392 Giessen, Germany
| | - Meerim Sartmyrzaeva
- Department of Mountain and Sleep Medicine and Pulmonary Hypertension, National Center of Cardiology and Internal Medicine, Bishkek 720040, Kyrgyzstan
| | - Akpay Sh. Sarybaev
- Department of Mountain and Sleep Medicine and Pulmonary Hypertension, National Center of Cardiology and Internal Medicine, Bishkek 720040, Kyrgyzstan
| | - Ralph Schermuly
- Department of Internal Medicine, German Center for Lung Research (DZL), Justus Liebig University of Giessen, 35392 Giessen, Germany
| | - Akylbek Sydykov
- Department of Internal Medicine, German Center for Lung Research (DZL), Justus Liebig University of Giessen, 35392 Giessen, Germany
- Correspondence:
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2
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Tanaka S, Hamada Y, Yokoyama Y, Yamamoto H, Kogo M. Osteopontin-derived synthetic peptide SVVYGLR upregulates functional regeneration of oral and maxillofacial soft-tissue injury. JAPANESE DENTAL SCIENCE REVIEW 2021; 57:174-181. [PMID: 34630775 PMCID: PMC8487951 DOI: 10.1016/j.jdsr.2021.09.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Revised: 08/31/2021] [Accepted: 09/13/2021] [Indexed: 01/03/2023] Open
Abstract
Wound healing in the oral and maxillofacial region is a complicated and interactive process. Severe mucosal or skeletal muscle injury by trauma or surgery induces worse healing conditions, including delayed wound closure and repair with excessive scar tissue. These complications lead to persistent functional impairment, such as digestive behavior or suppression of maxillofacial growth in infancy. Osteopontin (OPN), expressed in a variety of cells, is multifunctional and comprises a number of functional domains. Seven amino acids sequence, SVVYGLR (SV peptide), exposed by thrombin cleavage of OPN, has angiogenic activity and promotes fibroblast differentiation into myofibroblasts and increased expression of collagen type III. Additionally, synthetic SV peptide shows faster dermal and oral mucosal wound closure by facilitating cell motility and migratory activities in dermal- or mucosal-derived keratinocytes and fibroblasts. Moreover, cell motility and differentiation in myogenic cell populations are accelerated by SV peptide, which contributes to the facilitation of matured myofibers and scarless healing and favorable functional regeneration after skeletal muscle injury. SV peptide has high affinity with TGF-β, with potential involvement of the TGF-β/Smad signaling pathway. Clinical application of single-dose SV peptide could be a powerful alternative treatment option for excessive oral and maxillofacial wound care to prevent disadvantageous events.
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Affiliation(s)
- Susumu Tanaka
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Osaka, Japan
| | - Yoshinosuke Hamada
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University, Osaka, Japan
- Department of Health Economics and Management, Graduate School of Medicine, Osaka University, Osaka, Japan
- Department of Pediatric Dentistry, Osaka Dental University, Osaka, Japan
| | - Yuhki Yokoyama
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Hirofumi Yamamoto
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Mikihiko Kogo
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Osaka, Japan
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Hamada Y, Tanaka S, Fujishita Y, Cho JS, Usuki T, Yokoyama Y, Wu X, Mori S, Yamamoto H, Kogo M. The synthetic peptide SVVYGLR promotes myogenic cell motility via the TGFβ1/Smad signaling pathway and facilitates skeletal myogenic differentiation in vitro. Dent Mater J 2021; 40:957-963. [PMID: 33716279 DOI: 10.4012/dmj.2020-354] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In the present study, we investigated the possible involvement of the TGF-β/Smad signaling pathway in the osteopontin-derived SVVYGLR (SV) peptide-mediated migratory activities of myogenic cells and evaluated the facilitative effects of the SV peptide on the differentiation of myogenic cells in vitro. The SV peptide-induced migration in both human-derived satellite cells and myoblasts was substantially suppressed by the TGF-β1 receptor inhibitor SB431542 or SB505124. Besides, the expression level of the Smad3 phosphorylation was further enhanced by the addition of the SV peptide in comparison with control groups. Furthermore, an increase in the expression of myogenin-positive nuclei and a higher number of nascent myotubes with myosin heavy chain expression was confirmed in cultured myoblasts supplemented with the SV peptide. These results suggest that the involvement of the TGF-β/Smad signaling pathway in the SV peptide-mediated migration and the facilitative effect of the SV peptide on the differentiation of myogenic cells into myotubes.
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Affiliation(s)
- Yoshinosuke Hamada
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University.,Department of Health Economics and Management, Graduate School of Medicine, Osaka University.,Department of Pediatric Dentistry, Osaka Dental University
| | - Susumu Tanaka
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University
| | - Yohei Fujishita
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University
| | - Jung-Soo Cho
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University
| | - Takasuke Usuki
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University
| | - Yuhki Yokoyama
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University
| | - Xin Wu
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University
| | - Seiji Mori
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University.,Department of Medical Technology, Faculty of Health Sciences, Morinomiya University of Medical Sciences
| | - Hirofumi Yamamoto
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University
| | - Mikihiko Kogo
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University
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Tanaka S, Fujishita Y, Kawaguchi N, Usuki T, Yokoyama Y, Wu X, Mori S, Yamamoto H, Kogo M. The synthetic peptide SVVYGLR promotes cell motility of myogenic cells and facilitates differentiation in skeletal muscle regeneration. Dent Mater J 2021; 40:766-771. [PMID: 33563848 DOI: 10.4012/dmj.2020-317] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The present study was designed to evaluate the effects of the osteopontin-derived multifunctional short peptide, SVVYGLR (SV) peptide on the biological properties of skeletal muscle-specific myogenic cells. We employed human-derived satellite cells (HSkMSC) and skeletal muscle myoblasts (HSMM) and performed a series of biochemical experiments. The synthetic SV peptide showed no influence on the proliferation and adhesion properties of HSkMSC and HSMM, while it showed a significant increase in cell motility, including migration activities upon treatment with the SV peptide. In a rat model with volumetric loss of masticatory muscle, immunohistochemical staining of regenerating muscle tissue immediately after injury demonstrated an increase of the number of both MyoD- and myogenin-positive cells in SV peptide-treated group. These results suggest that SV peptide plays a potent role in facilitating skeletal muscle regeneration by promoting the migration, and differentiation of myogenic precursor and progenitor cells.
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Affiliation(s)
- Susumu Tanaka
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University
| | - Yohei Fujishita
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University
| | - Naomasa Kawaguchi
- Department of Cardiovascular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University.,Departments of Drug Discovery Cardiovascular Regeneration, Graduate School of Medicine, Osaka, Osaka University.,Graduate School of Health Sciences, Morinomiya University of Medical Sciences
| | - Takasuke Usuki
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University
| | - Yuhki Yokoyama
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University
| | - Xin Wu
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University
| | - Seiji Mori
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University.,Department of Medical Technology, Faculty of Health Sciences, Morinomiya University of Medical Sciences
| | - Hirofumi Yamamoto
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University
| | - Mikihiko Kogo
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University
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Dashdulam D, Kim ID, Lee H, Lee HK, Kim SW, Lee JK. Osteopontin heptamer peptide containing the RGD motif enhances the phagocytic function of microglia. Biochem Biophys Res Commun 2020; 524:371-377. [PMID: 32005517 DOI: 10.1016/j.bbrc.2020.01.100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 01/16/2020] [Indexed: 12/29/2022]
Abstract
Osteopontin (OPN) is a phosphorylated glycoprotein expressed in various tissues, including brain, and mediates a wide range of cellular activities. In our previous studies, we reported recombinant OPN and RGD and SLAY-containing OPN-peptide icosamer (OPNpt20) exhibited robust neuroprotective activities in an animal model of transient focal ischemia, and attributed these effects to the anti-inflammatory, pro-angiogenic, and phagocytic functions of OPNpt20. In the present study, we truncated OPNpt20 to 13 or 7 amino acid peptides containing RGD (R) and/or SLAY (S) motif (OPNpt13RS, OPNpt7R, OPNpt7RS, and OPNpt7S) and their cell motility and migration inducing activities were examined in BV2 cells (a microglia cell line). All four peptides significantly enhanced BV2 cell motility and migration, but OPNpt7R, an RGD-containing 7-amino-acid OPN peptide (VPNGRGD), was found to be most potent and its potency was comparable to OPNpt20. Phagocytic activity and F-actin polymerization were also significantly enhanced in OPNpt7R-treated BV2 cells. Importantly, studies using two mutant peptides (OPNpt7R-RAA and OPNpt7R-RAD, wherein RGD in OPNpt7R was replaced with RAA or RAD, respectively) revealed that all these effects of OPNpt7R, motility, migration, F-actin polymerization, and phagocytosis induction, were RGD-dependent. Furthermore, the Erk, Fak, and Akt signaling pathways appeared to be involved in the induction of phagocytic activity by OPNpt7R. Co-treating cells with OPNpt7R and D98059 or wortmannin (pharmacological inhibitors of Erk and Akt, respectively) significantly suppressed OPNpt7R-mediated phagocytosis induction. These results indicate the RGD-containing OPN heptamer OPNpt7R triggers microglial motility, migration, and phagocytic activity and that the RGD motif plays a critical role in these activities.
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Affiliation(s)
- Davaanyam Dashdulam
- Department of Anatomy, Inha University School of Medicine, Incheon, Republic of Korea; Medical Research Center, Inha University School of Medicine, Incheon, Republic of Korea
| | - Il-Doo Kim
- Department of Anatomy, Inha University School of Medicine, Incheon, Republic of Korea; Medical Research Center, Inha University School of Medicine, Incheon, Republic of Korea
| | - Hahnbie Lee
- Department of Anatomy, Inha University School of Medicine, Incheon, Republic of Korea; Medical Research Center, Inha University School of Medicine, Incheon, Republic of Korea
| | - Hye-Kyung Lee
- Department of Anatomy, Inha University School of Medicine, Incheon, Republic of Korea; Medical Research Center, Inha University School of Medicine, Incheon, Republic of Korea
| | - Seung-Woo Kim
- Department of Anatomy, Inha University School of Medicine, Incheon, Republic of Korea; Department of Biomedical Sciences, Inha University School of Medicine, Incheon, Republic of Korea
| | - Ja-Kyeong Lee
- Department of Anatomy, Inha University School of Medicine, Incheon, Republic of Korea; Medical Research Center, Inha University School of Medicine, Incheon, Republic of Korea.
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Tanaka S, Matsushita Y, Hamada Y, Kawaguchi N, Usuki T, Yokoyama Y, Tsuji T, Yamamoto H, Kogo M. Osteopontin-derived synthetic peptide SVVYGLR has potent utility in the functional regeneration of oral and maxillofacial skeletal muscles. Peptides 2019; 116:8-15. [PMID: 31004688 DOI: 10.1016/j.peptides.2019.04.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 04/01/2019] [Accepted: 04/16/2019] [Indexed: 12/12/2022]
Abstract
Oral and maxillofacial skeletal muscles are critical for oral motor functions, and severe damage to these muscles by trauma or surgery may lead to persistent functional impairment. This study investigated the effects of SVVYGLR (SV) peptide, a thrombin-cleaved osteopontin-derived motif, on histopathological wound healing and functional repair after severe injury of skeletal muscles. A rat model of volumetric muscle loss bilateral masseter muscle was developed. A single dose of SV-peptide or phosphate-buffered saline (PBS) was separately injected into the injured muscle belly. Histopathological and functional analyses were performed 1-8 weeks after the treatment. Behavioral analysis during free-feeding revealed that the feeding rate markedly increased in the SV-peptide group, in contrast, the PBS group showed fewer changes after the injury. Electromyogram recordings from injured muscles demonstrated amplification of rectified burst activity over time accompanied by increased maximal amplitude and duration in the SV-peptide group, in contrast, the PBS group showed moderate changes. A lissajous figure for bilateral masseter muscle activities also revealed superior functional recovery by the SV-peptide treatment. The SV-peptide also facilitated regeneration of muscles composed of matured myofibers with a greater diameter compared to the PBS group. In addition, granulation in the earlier period and fibrosis in the later period of wound healing were significantly inhibited by the SV-peptide treatment but not by the PBS treatment. Therefore, local application of the SV-peptide could help facilitate regeneration of muscles, inhibition of fibrosis, and improvement of functional impairment of oral and maxillofacial skeletal muscles damaged by severe trauma or surgery.
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Affiliation(s)
- Susumu Tanaka
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, 1-8 Yamada-oka, Suita, Osaka, 565-0871, Japan.
| | - Yutaka Matsushita
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, 1-8 Yamada-oka, Suita, Osaka, 565-0871, Japan.
| | - Yoshinosuke Hamada
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University, 1-7 Yamada-oka, Suita, Osaka, 565-0871, Japan; Department of Health Economics and Management, Graduate School of Medicine, Osaka University, 1-7 Yamada-oka, Suita, Osaka, 565-0871, Japan; Department of Pediatric Dentistry, Osaka Dental University, 1-5-17 Ohtemae Chuo-ku, Osaka, 540-0008, Japan.
| | - Naomasa Kawaguchi
- Department of Cardiovascular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University, 1-7 Yamada-oka, Suita, Osaka, 565-0871, Japan; Departments of Drug Discovery Cardiovascular Regeneration, Graduate School of Medicine, Osaka, Osaka University, 2-2 Yamada-oka, Suita, Osaka, 565-0871, Japan; Graduate School of Health Sciences, Morinomiya University of Medical Sciences, 1-26-16 Nankokita, Suminoe-ku, Osaka, Osaka, 559-8611, Japan.
| | - Takasuke Usuki
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, 1-8 Yamada-oka, Suita, Osaka, 565-0871, Japan.
| | - Yuhki Yokoyama
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University, 1-7 Yamada-oka, Suita, Osaka, 565-0871, Japan.
| | - Tadataka Tsuji
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, 1-8 Yamada-oka, Suita, Osaka, 565-0871, Japan.
| | - Hirofumi Yamamoto
- Department of Molecular Pathology, Division of Health Sciences, Graduate School of Medicine, Osaka University, 1-7 Yamada-oka, Suita, Osaka, 565-0871, Japan.
| | - Mikihiko Kogo
- The 1st Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, 1-8 Yamada-oka, Suita, Osaka, 565-0871, Japan.
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Uchinaka A, Yoshida M, Tanaka K, Hamada Y, Mori S, Maeno Y, Miyagawa S, Sawa Y, Nagata K, Yamamoto H, Kawaguchi N. Overexpression of collagen type III in injured myocardium prevents cardiac systolic dysfunction by changing the balance of collagen distribution. J Thorac Cardiovasc Surg 2018; 156:217-226.e3. [DOI: 10.1016/j.jtcvs.2018.01.097] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Revised: 01/09/2018] [Accepted: 01/11/2018] [Indexed: 11/29/2022]
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Kim ID, Lee H, Jin YC, Lee JK. Osteopontin Peptide Icosamer Containing RGD and SLAYGLR Motifs Enhances the Motility and Phagocytic Activity of Microglia. Exp Neurobiol 2017; 26:339-349. [PMID: 29302201 PMCID: PMC5746499 DOI: 10.5607/en.2017.26.6.339] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 11/16/2017] [Accepted: 12/01/2017] [Indexed: 11/19/2022] Open
Abstract
Osteopontin (OPN) is a secreted glycoprotein that is expressed in various tissues, including brain, and mediates a wide range of cellular activities. In a previous study, the authors observed the robust neuroprotective effects of recombinant OPN and of RGD and SLAYGLR-containing OPN-peptide icosamer (OPNpt20) in an animal model of transient focal ischemia, and demonstrated anti-inflammatory and pro-angiogenic effects of OPNpt20 in the postischemic brain. In the present study, we investigated the effects of OPNpt20 on the motility and phagocytic activity of BV2 cells (a microglia cell line). F-actin polymerization and cell motility were significantly enhanced in OPNpt20-treated BV2 cells, and numbers of filopodia-like processes increased and lamellipodia-like structures enlarged and thickened. In addition, treatment of cells with either of three mutant OPN icosamers containing mutation within RGD, SLAY, or RGDSLAY showed that the RGD and SLAY motifs of OPNpt20 play critical roles in the enhancement of cell motility, and the interaction between exogenous OPNpt20 and endogenous αv and α4 integrin and the activations of FAK, Erk, and Akt signaling pathways were found to be involved in the OPNpt20-mediated induction of cell motility. Furthermore, phagocytic activity of microglia was also significantly enhanced by OPNpt20 in a RGD and SLAY dependent manner. These results indicate OPNpt20 containing RGD and SLAY motifs triggers microglial motility and phagocytic activity and OPNpt20-integrin mediated signaling plays a critical role in these activities.
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Affiliation(s)
- Il-Doo Kim
- Department of Anatomy, Inha University School of Medicine, Incheon, Korea.,Medical Research Center, Inha University School of Medicine, Incheon, Korea
| | - Hahnbie Lee
- Department of Anatomy, Inha University School of Medicine, Incheon, Korea.,Medical Research Center, Inha University School of Medicine, Incheon, Korea
| | - Yin-Chuan Jin
- Department of Histology and Embryology, Binzhou Medical University, Yantai 264000, China
| | - Ja-Kyeong Lee
- Department of Anatomy, Inha University School of Medicine, Incheon, Korea.,Medical Research Center, Inha University School of Medicine, Incheon, Korea
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Gao XR, Xu HJ, Wang LF, Liu CB, Yu F. Mesenchymal stem cell transplantation carried in SVVYGLR modified self-assembling peptide promoted cardiac repair and angiogenesis after myocardial infarction. Biochem Biophys Res Commun 2017; 491:112-118. [DOI: 10.1016/j.bbrc.2017.07.056] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Accepted: 07/10/2017] [Indexed: 01/21/2023]
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Longitudinal observations of progressive cardiac dysfunction in a cardiomyopathic animal model by self-gated cine imaging based on 11.7-T magnetic resonance imaging. Sci Rep 2017; 7:9106. [PMID: 28831129 PMCID: PMC5567262 DOI: 10.1038/s41598-017-09755-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 07/31/2017] [Indexed: 11/16/2022] Open
Abstract
The purpose of this study was to longitudinally assess left ventricular function and wall thickness in a hamster model of cardiomyopathy using 11.7-T magnetic resonance imaging (MRI). MRI were performed for six cardiomyopathic J2N-k hamsters and six J2N-n hamsters at 5, 10, 15, and 20 weeks of age. Echocardiography was also performed at 20 weeks. The ejection fraction (EF) at 15 and 20 weeks of age in J2N-k hamsters showed a significant decrease compared with those in controls. Conversely, the end-systolic and end-diastolic volumes in cardiomyopathic hamsters showed a significant increase compared with those in controls. Moreover, the heart walls of J2N-k hamsters at 15 and 20 weeks were thicker than those of controls at end-systole; however, there were no significant differences at end-diastole. Optical microscopy with Masson’s trichrome staining depicted no fibrosis in the control myocardium, although it showed interstitial fibrosis in the 20-week-old J2N-k cardiomyopathic myocardium. There were no differences in EF and the wall thickness observed on MRI and those observed on echocardiography. These results indicate the presence of systolic dysfunction in cardiomyopathic hamsters. Self-gated cine imaging based on 11.7-T MRI can be used for serial measurements of cardiac function and wall thickness in a cardiomyopathic model.
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Evaluation of dermal wound healing activity of synthetic peptide SVVYGLR. Biochem Biophys Res Commun 2017; 491:714-720. [PMID: 28751213 DOI: 10.1016/j.bbrc.2017.07.124] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 07/22/2017] [Indexed: 12/17/2022]
Abstract
SVVYGLR peptide (SV peptide) is a 7-amino-acid sequence with angiogenic properties that is derived from osteopontin in the extracellular matrix and promotes differentiation of fibroblasts to myofibroblast-like cells and the production of collagen type Ⅲ by cardiac fibroblasts. However, the effects of SV peptide on dermal cells and tissue are unknown. In this study, we evaluated the effects of this peptide in a rat model of dermal wound healing. The synthetic SV peptide was added to dermal fibroblasts or keratinocytes, and their cellular motility was evaluated. In an in vivo wound healing exeriment, male rats aged 8 weeks were randomly assigned to the SV peptide treatment, non-treated control, or phosphate-buffered saline (PBS) groups. Wound healing was assessed by its repair rate and histological features. Scratch assay and cell migration assays using the Chemotaxicell method showed that SV peptide significantly promoted the cell migration in both fibroblasts and keratinocytes. In contrast the proliferation potency of these cells was not affected by SV peptide. In the rat model, wound healing progressed faster in the SV peptide-treated group than in the control and PBS groups. The histopathological analyses showed that the SV peptide treatment stimulated the migration of fibroblasts to the wound area and increased the number of myofibroblasts. Immunohistochemical staining showed a marked increase of von Willebland factor-positive neomicrovessels in the SV peptide-treated group. In conclusion, SV peptide has a beneficial function to promote wound healing by stimulating granulation via stimulating angiogenesis, cell migration, and the myofibroblastic differentiation of fibroblasts.
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