1
|
Li K, Wang J, Xu J, Sun X, Li P, Fan Y. Construction of chitosan-gelatin polysaccharide-protein composite hydrogel via mechanical stretching and its biocompatibility in vivo. Int J Biol Macromol 2024; 264:130357. [PMID: 38395273 DOI: 10.1016/j.ijbiomac.2024.130357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 02/19/2024] [Accepted: 02/19/2024] [Indexed: 02/25/2024]
Abstract
Natural polysaccharides and protein macromolecules are the important components of extracellular matrix (ECM), but individual component generally exhibits weak mechanical property, limited biological function or strong immunogenicity in tissue engineering. Herein, gelatin (Gel) was deposited to the stretched (65 %) chitosan (CS) hydrogel substrates to fabricate the polysaccharide-protein CS-Gel-65 % composite hydrogels to mimic the natural component of ECM and improve the above deficiencies. CS hydrogel substrates under different stretching deformations exhibited tunable morphology, chemical property and wettability, having a vital influence on the secondary structures of deposited fibrous Gel protein, namely appearing with the decreased β-sheet content in stretched CS hydrogel. Gel also produced a more homogenous distribution on the stretched CS hydrogel substrate due to the unfolding of Gel and increased interactions between Gel and CS than on the unstretched substrate. Moreover, the polysaccharide-protein composite hydrogel possessed enhanced mechanical property and oriented structure via stretching-drying method. Besides, in vivo subcutaneous implantation indicated that the CS-Gel-65 % composite hydrogel showed lower immunogenicity, thinner fibrous capsule, better angiogenesis effect and increased M2/M1 of macrophage phenotype. Polysaccharide-protein CS-Gel-65 % composite hydrogel offers a novel material as a tissue engineering scaffold, which could promote angiogenesis and build a good immune microenvironment for the damaged tissue repair.
Collapse
Affiliation(s)
- Kun Li
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Jingxi Wang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Junwei Xu
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Xuemei Sun
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Ping Li
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.
| | - Yubo Fan
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; School of Medical Science and Engineering, Beihang University, Beijing 100191, China.
| |
Collapse
|
2
|
Shan F, Zhang N, Yao X, Li Y, Wang Z, Zhang C, Wang Y. Mechanosensitive channel of large conductance enhances the mechanical stretching-induced upregulation of glycolysis and oxidative metabolism in Schwann cells. Cell Commun Signal 2024; 22:93. [PMID: 38302971 PMCID: PMC10835878 DOI: 10.1186/s12964-024-01497-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 01/21/2024] [Indexed: 02/03/2024] Open
Abstract
BACKGROUND Physical exercise directly stretching the peripheral nerve promotes nerve regeneration; however, its action mechanism remains elusive. Our present study aimed to investigate the effects of mechanosensitive channel of large conductance (MscL) activated by mechanical stretching on the cultured Schwann cells (SCs) and explore the possible mechanism. METHODS Primary SCs from neonatal mice at 3-5 days of age were derived and transfected with the lentivirus vector expressing a mutant version of MscL, MscL-G22S. We first detected the cell viability and calcium ion (Ca2+) influx in the MscL-G22S-expressing SCs with low-intensity mechanical stretching and the controls. Proteomic and energy metabolomics analyses were performed to investigate the comprehensive effects of MscL-G22S activation on SCs. Measurement of glycolysis- and oxidative phosphorylation-related molecules and ATP production were respectively performed to further validate the effects of MscL-G22S activation on SCs. Finally, the roles of phosphatidylinositol-3-kinase (PI3K)/AKT/mammalian target of rapamycin (mTOR) signaling pathway in the mechanism of energy metabolism modulation of SCs by MscL-G22S activation was investigated. RESULTS Mechanical stretching-induced MscL-G22S activation significantly increased the cell viability and Ca2+ influx into the SCs. Both the proteomic and targeted energy metabolomics analysis indicated the upregulation of energy metabolism as the main action mechanism of MscL-G22S-activation on SCs. MscL-G22S-activated SCs showed significant upregulation of glycolysis and oxidative phosphorylation when SCs with stretching alone had only mild upregulation of energy metabolism than those without stimuli. MscL-G22S activation caused significant phosphorylation of the PI3K/AKT/mTOR signaling pathway and upregulation of HIF-1α/c-Myc. Inhibition of PI3K abolished the MscL-G22S activation-induced upregulation of HIF-1α/c-Myc signaling in SCs and reduced the levels of glycolysis- and oxidative phosphorylation-related substrates and mitochondrial activity. CONCLUSION Mechanical stretching activates MscL-G22S to significantly promote the energy metabolism of SCs and the production of energic substrates, which may be applied to enhance nerve regeneration via the glia-axonal metabolic coupling.
Collapse
Affiliation(s)
- Fangzhen Shan
- Medical Research Centre, Affiliated Hospital of Jining Medical University, Jining, Shandong Province, China
| | - Nannan Zhang
- Department of Respiratory and Critical Care, Affiliated Hospital of Jining Medical University, Jining, Shandong Province, China
| | - Xiaoying Yao
- Medical Research Centre, Affiliated Hospital of Jining Medical University, Jining, Shandong Province, China
| | - Yi Li
- Department of Neurology, Affiliated Hospital of Jining Medical University, 89 Guhuai Road, Jining City, Shandong Province, 272029, China
| | - Zihao Wang
- Cheeloo Medical College, Shandong University, Jinan, Shandong Province, China
| | - Chuanji Zhang
- College of Rehabilitation Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong Province, China
| | - Yuzhong Wang
- Medical Research Centre, Affiliated Hospital of Jining Medical University, Jining, Shandong Province, China.
- Department of Neurology, Affiliated Hospital of Jining Medical University, 89 Guhuai Road, Jining City, Shandong Province, 272029, China.
| |
Collapse
|
3
|
Ma H, Wang L, Sun H, Yu Q, Yang T, Wang Y, Niu B, Jia Y, Liu Y, Liang Z, An M, Guo J. MIR-107/HMGB1/FGF-2 axis responds to excessive mechanical stretch to promote rapid repair of vascular endothelial cells. Arch Biochem Biophys 2023:109686. [PMID: 37406794 DOI: 10.1016/j.abb.2023.109686] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 06/01/2023] [Accepted: 07/02/2023] [Indexed: 07/07/2023]
Abstract
The increase of vascular wall tension can lead to endothelial injury during hypertension, but its potential mechanism remains to be studied. Our results of previous study showed that HUVECs could induce changes in HMGB1/RAGE to resist abnormal mechanical environments in pathological mechanical stretching. In this study, we applied two different kinds of mechanical tension to endothelial cells using the in vitro mechanical loading system FlexCell-5000T and focused on exploring the expression of miR-107 related pathways in HUVECs with excessive mechanical tension. The results showed that miR-107 negatively regulated the expression of the HMGB1/RAGE axis under excessive mechanical tension. Excessive mechanical stretching reduced the expression of miR-107 in HUVECs, and increased the expression of the HMGB1/RAGE axis. When miR-107 analog was transfected into HUVECs with lipo3000 reagent, the overexpression of miR-107 slowed down the increase of the HMGB1/RAGE axis caused by excessive mechanical stretching. At the same time, the overexpression of miR-107 inhibited the proliferation and migration of HUVECs to a certain extent. On the contrary, when miR-107 was silent, the proliferation and migration of HUVECs showed an upward trend. In addition, the study also showed that under excessive mechanical tension, miR-107 could regulate the expression of FGF-2 by HMGB1. In conclusion, these findings suggest that pathological mechanical stretching promote resistance to abnormal mechanical stimulation on HUVECs through miR-107/HMGB1/RAGE/FGF-2 pathway, thus promote vascular repair after endothelial injury. The suggest that miR-107 is a potential therapeutic target for hypertension.
Collapse
Affiliation(s)
- Haiyang Ma
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Li Wang
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Haoyu Sun
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Qing Yu
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Tiantian Yang
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Yajing Wang
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Bin Niu
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Yaru Jia
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Yang Liu
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Ziwei Liang
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China
| | - Meiwen An
- Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China.
| | - Jiqiang Guo
- Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, 030032, PR China; Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China; Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Shanxi, 030024, PR China.
| |
Collapse
|
4
|
Li Y, Li L, Li B, Liao W, Liu T, Shen F, Hong L. Mechanical stretching induces fibroblasts apoptosis through activating Piezo1 and then destroying actin cytoskeleton. Int J Med Sci 2023; 20:771-780. [PMID: 37213676 PMCID: PMC10198138 DOI: 10.7150/ijms.81666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 04/06/2023] [Indexed: 05/23/2023] Open
Abstract
The anatomical positions of pelvic floor organs are maintained by ligaments and muscles. Stress urinary incontinence (SUI) occurs when the pelvic floor tissues are repeatedly stimulated by excessive mechanical tension that exceeds the bearing capacity of ligaments or muscles. Besides, cells respond mechanically to mechanical stimulation by reconstituting the Piezo1 and cytoskeletal system. The aim of this study is to determine how Piezo1 and actin cytoskeleton are involved in the mechanized stretch (MS) induced apoptosis of human anterior vaginal wall fibroblasts (hAVWFs) and the mechanism. A four-point bending device was used to provide mechanical stretching to establish a cellular mechanical damage model. The apoptosis of hAVWFs cells in non-SUI patients was significantly increased by MS, which exhibited apoptosis rates comparable to those of SUI patients. Based on these findings, Piezo1 connects the actin cytoskeleton to the apoptosis of hAVWFs cells, providing an idea for the clinical diagnosis and treatment of SUI. However, the disassembly of the actin cytoskeleton suppressed the protective effect of Piezo1 silencing on MS. Based on these findings, Piezo1 connects the actin cytoskeleton to apoptosis of hAVWFs, providing new insight for the clinical diagnosis and treatment of SUI.
Collapse
Affiliation(s)
- Yang Li
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, P. R. China
| | - Lu Li
- Department of Gynecology and Obstetrics, the People's Hospital of Three Gorges University/ the First People's Hospital of Yichang
| | - Bingshu Li
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, P. R. China
| | - Wenxin Liao
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, P. R. China
| | - Tingting Liu
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, P. R. China
| | - Fujin Shen
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, P. R. China
- ✉ Corresponding authors: Dr. Li Hong, Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, 238 Jiefang Road, Wuhan 430060, Hubei Province, P.R. China, E-mail: ; Dr. Fujin Shen, Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, 238 Jiefang Road, Wuhan 430060, Hubei Province, P.R. China, E-mail:
| | - Li Hong
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, P. R. China
- ✉ Corresponding authors: Dr. Li Hong, Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, 238 Jiefang Road, Wuhan 430060, Hubei Province, P.R. China, E-mail: ; Dr. Fujin Shen, Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, 238 Jiefang Road, Wuhan 430060, Hubei Province, P.R. China, E-mail:
| |
Collapse
|
5
|
Li Y, Liu C, Yang L, Li L, Hong L. Puerarin protects fibroblasts against mechanical stretching injury through Nrf2/TGF-β1 signaling pathway. Int Urogynecol J 2022; 33:2565-2576. [PMID: 35962806 DOI: 10.1007/s00192-022-05325-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 08/01/2022] [Indexed: 12/01/2022]
Abstract
INTRODUCTION AND HYPOTHESIS Stress urinary incontinence (SUI) is the most common form of urinary incontinence in women, which affects women's quality of life worldwide. Mechanical injury of the pelvic floor may disrupt the pelvic supportive tissues and connections via the remodeling of extracellular matrix (ECM), which is supposed to be one of the main pathological mechanisms of SUI. METHODS The SUI mouse model was established using vaginal distension (VD). Leak point pressure (LPP), maximum cystometric capacity (MCC), collagen, Nrf2 and TGF-β1 in the anterior vaginal wall were measured in either wild-type or Nrf2-knockout (Nrf2-/-) female C57BL/6 mice with or without puerarin treatment. Then, the mechanical stretching (MS) loaded on L929 cells was generated by a four-point bending device. mTGF-β1 or LY2109761 (an inhibitor of TGF-β1) was used to verify the protective effect of puerarin after Nrf2 knockdown or overexpression. RESULTS The collagen content of the anterior vaginal tissues in VD mice and LPP and MCC was decreased significantly. Besides, the expression levels of Nrf2, TGF-β1, collagen I and collagen III of MS group were downregulated in L929 cells. Puerarin pretreatment could reverse mechanical injury-induced collagen downregulation and Nrf2/TGF-β1 signaling inhibition. Moreover, both LY2109761 pretreatment and Nrf2 knockdown could attenuate the protective effect of puerarin in the mechanical injury-induced ECM remodeling, whereas exogenous TGF-β1 could counteract the effect of Nrf2 downregulation. CONCLUSIONS Puerarin protected fibroblasts from mechanical injury-induced ECM remodeling through the Nrf2/TGF-β1 signaling pathway. This might be a new strategy for the treatment of SUI.
Collapse
Affiliation(s)
- Yang Li
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, 238 Jiefang Road, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Cheng Liu
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, 238 Jiefang Road, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Lian Yang
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, 238 Jiefang Road, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Lu Li
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, 238 Jiefang Road, Wuhan, 430060, Hubei Province, People's Republic of China
| | - Li Hong
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, 238 Jiefang Road, Wuhan, 430060, Hubei Province, People's Republic of China.
| |
Collapse
|
6
|
Liang W, Zhao E, Li G, Bi H, Zhao Z. Suture Cells in a Mechanical Stretching Niche: Critical Contributors to Trans-sutural Distraction Osteogenesis. Calcif Tissue Int 2022; 110:285-293. [PMID: 34802070 DOI: 10.1007/s00223-021-00927-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 10/25/2021] [Indexed: 02/06/2023]
Abstract
Trans-sutural distraction osteogenesis has been proposed as an alternative technique of craniofacial remodelling surgery for craniosynostosis correction. Many studies have defined the contribution of a series of biological events to distraction osteogenesis, such as changes in gene expression, changes in suture cell behaviour and changes in suture collagen fibre characteristics. However, few studies have elucidated the systematic molecular and cellular mechanisms of trans-sutural distraction osteogenesis, and no study has highlighted the contribution of cell-cell or cell-matrix interactions with respect to the whole expansion process to date. Therefore, it is difficult to translate largely primary mechanistic insights into clinical applications and optimize the clinical outcome of trans-sutural distraction osteogenesis. In this review, we carefully summarize in detail the literature related to the effects of mechanical stretching on osteoblasts, endothelial cells, fibroblasts, immune cells (macrophages and T cells), mesenchymal stem cells and collagen fibres in sutures during the distraction osteogenesis process. We also briefly review the contribution of cell-cell or cell-matrix interactions to bone regeneration at the osteogenic suture front from a comprehensive viewpoint.
Collapse
Affiliation(s)
- Wei Liang
- Department of Plastic Surgery, Peking University Third Hospital, Beijing, 100191, China
| | - Enzhe Zhao
- Department of Orthopedics, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Shanxi Medical University, Taiyuan, China
| | - Guan Li
- Department of Plastic Surgery, Peking University Third Hospital, Beijing, 100191, China
| | - Hongsen Bi
- Department of Plastic Surgery, Peking University Third Hospital, Beijing, 100191, China.
| | - Zhenmin Zhao
- Department of Plastic Surgery, Peking University Third Hospital, Beijing, 100191, China.
| |
Collapse
|
7
|
Liang W, Ding P, Qian J, Li G, Lu E, Zhao Z. Polarized M2 macrophages induced by mechanical stretching modulate bone regeneration of the craniofacial suture for midfacial hypoplasia treatment. Cell Tissue Res 2021; 386:585-603. [PMID: 34568957 DOI: 10.1007/s00441-021-03533-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 09/21/2021] [Indexed: 01/01/2023]
Abstract
The underlying mechanism of the trans-sutural distraction osteogenesis (TSDO) technique as an effective treatment that improves the symptoms of midfacial hypoplasia syndromes is not clearly understood. Increasing findings in the orthopedics field indicate that macrophages are mechanically sensitive and their phenotypes can respond to mechanical cues. However, how macrophages respond to mechanical stretching and consequently influence osteoblast differentiation of suture-derived stem cells (SuSCs) remains unclear, particularly during the TSDO process. In the present study, we established a TSDO rat model to determine whether and how macrophages were polarized in response to stretching and consequently affected bone regeneration of the suture frontal edge. Notably, after performing immunofluorescence, RNA-sequencing, and micro-computed tomography, it was demonstrated that macrophages are first recruited by various chemokines factors and polarized to the M2 phenotype upon optimal stretching. The latter in turn regulates SuSC activity and facilitates bone regeneration in sutures. Moreover, when the activated M2 macrophages were suppressed by pharmacological manipulation, new bone microarchitecture could rarely be detected under mechanical stretching and the expansion of the sutures was clear. Additionally, macrophages achieved M2 polarization in response to the optimal mechanical stretching (10%, 0.5 Hz) and strongly facilitated SuSC osteogenic differentiation and human umbilical vein endothelial cell angiogenesis using an indirect co-culture system in vitro. Collectively, this study revealed the mechanical stimulation-immune response-bone regeneration axis and clarified at least in part how sutures achieve bone regeneration in response to mechanical force.
Collapse
|
8
|
Lin Y, Zhang Y, Zhang F, Zhang M, Li D, Deng G, Guan L, Dong M. Studies on the electrostatic effects of stretched PVDF films and nanofibers. Nanoscale Res Lett 2021; 16:79. [PMID: 33939029 PMCID: PMC8093351 DOI: 10.1186/s11671-021-03536-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 04/20/2021] [Indexed: 05/09/2023]
Abstract
The electroactive β-phase in Poly (vinylidene fluoride, PVDF) is the most desirable conformation due to its highest pyro- and piezoelectric properties, which make it feasible to be used as flexible sensors, wearable electronics, and energy harvesters etc. In this study, we successfully developed a method to obtain high-content β-phase PVDF films and nanofiber meshes by mechanical stretching and electric spinning. The phase transition process and pyro- and piezoelectric effects of stretched films and nanofiber meshes were characterized by monitoring the polarized light microscopy (PLM) images, outputting currents and open-circuit voltages respectively, which were proved to be closely related to stretching ratio (λ) and concentrations. This study could expand a new route for the easy fabrication and wide application of PVDF films or fibers in wearable electronics, sensors, and energy harvesting devices.
Collapse
Affiliation(s)
- Yixuan Lin
- Department of Chemistry, Renmin University of China, Beijing, 100872 People’s Republic of China
| | - Yuqiong Zhang
- Department of Chemistry, Renmin University of China, Beijing, 100872 People’s Republic of China
| | - Fan Zhang
- Department of Chemistry, Renmin University of China, Beijing, 100872 People’s Republic of China
| | - Meining Zhang
- Department of Chemistry, Renmin University of China, Beijing, 100872 People’s Republic of China
| | - Dalong Li
- School of Marine Science and Technology, Harbin Institute of Technology At Weihai, Weihai, 264209 Shandong People’s Republic of China
- Sino-Danish Center for Education and Research (SDC), Interdisciplinary Nanoscience Center (iNANO), Aarhus University, DK-8000 Aarhus C, Denmark
| | - Gaofeng Deng
- State Key Laboratory of Building Safety and Environment, China Academy of Building Research, Beijing, 100013 People’s Republic of China
| | - Li Guan
- Department of Chemistry, Renmin University of China, Beijing, 100872 People’s Republic of China
| | - Mingdong Dong
- Sino-Danish Center for Education and Research (SDC), Interdisciplinary Nanoscience Center (iNANO), Aarhus University, DK-8000 Aarhus C, Denmark
| |
Collapse
|
9
|
Zeng W, Li Y, Li B, Liu C, Hong S, Tang J, Hong L. Mechanical Stretching induces the apoptosis of parametrial ligament Fibroblasts via the Actin Cytoskeleton/Nr4a1 signalling pathway. Int J Med Sci 2020; 17:1491-1498. [PMID: 32669951 PMCID: PMC7359389 DOI: 10.7150/ijms.46354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 05/31/2020] [Indexed: 12/02/2022] Open
Abstract
The anatomical positions of pelvic floor organs are maintained mainly by ligaments and muscles. Long-term excessive mechanical tension stimulation of pelvic floor tissue beyond the endurance of ligaments or muscles will lead to the occurrence of pelvic organ prolapse (POP). In addition, cytoskeletal reconstitution is a key process by which cells respond to mechanical stimulation. The aim of the present study was to investigate the protective effect of actin cytoskeleton to resist mechanical stretching (MS)-induced apoptosis in parametrial ligament fibroblasts (PLFs) and the underlying mechanisms. MS provided by a four‑point bending device could significantly induce apoptosis of PLFs from non-POP patients, which exhibited an apoptosis rate close to that of PLFs from POP patients, and the apoptosis rate was higher following latrunculin A (Lat-A, a potent inhibitor of actin) treatment. In addition, Nr4a1 and Bax expression was increased while Bcl-2 and caspase-3 expression was clearly decreased after treatment with MS and Lat-A. However, the apoptosis induced by MS was reduced when the expression of Nr4a1 was downregulated by siRNA. These outcomes reveal a novel mechanism that links the actin cytoskeleton and apoptosis in PLFs by Nr4a1; this mechanism will provide insight into the clinical diagnosis and treatment of POP.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Li Hong
- Department of Gynecology and Obstetrics, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, P. R. China
| |
Collapse
|
10
|
Zhou Z, Shi G, Zheng X, Jiang S, Jiang L. Autophagy activation facilitates mechanical stimulation-promoted osteoblast differentiation and ameliorates hindlimb unloading-induced bone loss. Biochem Biophys Res Commun 2018. [PMID: 29524406 DOI: 10.1016/j.bbrc.2018.03.040] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Autophagy has been indicated to be involved in regulating bone metabolism. However, little is known about the role of autophagy in mechanical stimulation-influenced osteoblast differentiation and bone formation. In the present study, we first demonstrated that autophagy activation was essential for cyclic mechanical stretching-promoted osteoblast differentiation of bone marrow mesenchymal stem cells. To explore the in vivo role of autophagy in osteoblast differentiation, the hindlimb unloading-induced disuse osteoporosis model was used. Compared to the normal controls, hindlimb unloading led to abundant bone loss as well as lessened autophagy activation of osteoblasts. However, the activation of autophagy by ULK1 overexpression or in the presence of rapamycin significantly increased osteoblast differentiation activity and restored the bone volume. The findings implicate autophagy as a novel mechanosensitive pathway that regulates osteoblast differentiation. The pharmacological activation of autophagy may be an interesting approach for the prevention and treatment of disuse osteoporosis.
Collapse
Affiliation(s)
- Zezhu Zhou
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - Guixun Shi
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - Xinfeng Zheng
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - Shengdan Jiang
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - Leisheng Jiang
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China.
| |
Collapse
|
11
|
Gu SR, Kang YG, Shin JW, Shin JW. Simultaneous engagement of mechanical stretching and surface pattern promotes cardiomyogenic differentiation of human mesenchymal stem cells. J Biosci Bioeng 2016; 123:252-258. [PMID: 27546303 DOI: 10.1016/j.jbiosc.2016.07.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 06/28/2016] [Accepted: 07/26/2016] [Indexed: 12/18/2022]
Abstract
It has been widely recognized and proved that biophysical factors for mimicking in vivo conditions should be also considered to have stem cells differentiated into desired cell type in vitro along with biochemical factors. Biophysical factors include substrate and biomechanical conditions. This study focused on the effect of biomimetic mechanical stretching along with changes in substrate topography to influence on cardiomyogenic differentiation of human mesenchymal stem cells (hMSCs). Elastic micropatterned substrates were made to mimic the geometric conditions surrounding cells in vivo. To mimic biomechanical conditions due to beating of the heart, mechanical stretching was applied parallel to the direction of the pattern (10% elongation, 0.5 Hz, 4 h/day). Suberoylanilide hydroxamic acid (SAHA) was used as a biochemical factor. The micropatterned substrate was found more effective in the alignment of cytoskeleton and cardiomyogenic differentiation compared with flat substrate. Significantly higher expression levels of related markers [GATA binding protein 4 (GATA4), troponin I, troponin T, natriuretic peptide A (NPPA)] were observed when mechanical stretching was engaged on micropatterned substrate. In addition, 4 days of mechanical stretching was associated with higher levels of expression than 2 days of stretching. These results indicate that simultaneous engagement of biomimetic environment such as substrate pattern and mechanical stimuli effectively promotes the cardiomyogenic differentiation of hMSCs in vitro. The suggested method which tried to mimic in vivo microenvironment would provide systematic investigation to control cardiomyogenic differentiation of hMSCs.
Collapse
Affiliation(s)
- Seo Rin Gu
- Department of Health Science and Technology, Inje University, Gimhae, Gyeongnam 50834, Republic of Korea
| | - Yun Gyeong Kang
- Department of Biomedical Engineering, Inje University, Gimhae, Gyeongnam 50834, Republic of Korea
| | - Ji Won Shin
- Department of Biomedical Engineering, Inje University, Gimhae, Gyeongnam 50834, Republic of Korea
| | - Jung-Woog Shin
- Department of Health Science and Technology, Inje University, Gimhae, Gyeongnam 50834, Republic of Korea; Department of Biomedical Engineering, Inje University, Gimhae, Gyeongnam 50834, Republic of Korea; Cardiovascular and Metabolic Disease Center/Institute of Aged Life Redesign/UHARC, Inje University, Gimhae, Gyeongnam 50834, Republic of Korea.
| |
Collapse
|
12
|
Liang X, Huang X, Zhou Y, Jin R, Li Q. Mechanical Stretching Promotes Skin Tissue Regeneration via Enhancing Mesenchymal Stem Cell Homing and Transdifferentiation. Stem Cells Transl Med 2016; 5:960-9. [PMID: 27130223 DOI: 10.5966/sctm.2015-0274] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 02/23/2016] [Indexed: 12/14/2022] Open
Abstract
UNLABELLED Skin tissue expansion is a clinical procedure for skin regeneration to reconstruct cutaneous defects that can be accompanied by severe complications. The transplantation of mesenchymal stem cells (MSCs) has been proven effective in promoting skin expansion and helping to ameliorate complications; however, systematic understanding of its mechanism remains unclear. MSCs from luciferase-Tg Lewis rats were intravenously transplanted into a rat tissue expansion model to identify homing and transdifferentiation. To clarify underlying mechanisms, a systematic approach was used to identify the differentially expressed genes between mechanically stretched human MSCs and controls. The biological significance of these changes was analyzed through bioinformatic methods. We further investigated genes and pathways of interest to disclose their potential role in mechanical stretching-induced skin regeneration. Cross sections of skin samples from the expanded group showed significantly more luciferase(+) and stromal cell-derived factor 1α (SDF-1α)(+), luciferase(+)keratin 14(+), and luciferase(+)CD31(+) cells than the control group, indicating MSC transdifferentiation into epidermal basal cells and endothelial cells after SDF-1α-mediated homing. Microarray analysis suggested upregulation of genes related to hypoxia, vascularization, and cell proliferation in the stretched human MSCs. Further investigation showed that the homing of MSCs was blocked by short interfering RNA targeted against matrix metalloproteinase 2, and that mechanical stretching-induced vascular endothelial growth factor A upregulation was related to the Janus kinase/signal transducer and activator of transcription (Jak-STAT) and Wnt signaling pathways. This study determines that mechanical stretching might promote skin regeneration by upregulating MSC expression of genes related to hypoxia, vascularization, and cell proliferation; enhancing transplanted MSC homing to the expanded skin; and transdifferentiation into epidermal basal cells and endothelial cells. SIGNIFICANCE Skin tissue expansion is a clinical procedure for skin regeneration to cover cutaneous defects that can be accompanied by severe complications. The transplantation of mesenchymal stem cells (MSCs) has been proven effective in promoting skin expansion and ameliorating complications. This study, which sought to provide a systematic understanding of the mechanism, determined that mechanical stretching could upregulate MSC expression of genes related to hypoxia, vascularization, and cell proliferation; enhance transplanted MSC homing to the expanded skin tissue; and promote their transdifferentiation into epidermal basal cells and endothelial cells.
Collapse
Affiliation(s)
- Xiao Liang
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - Xiaolu Huang
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - Yiwen Zhou
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - Rui Jin
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - Qingfeng Li
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| |
Collapse
|