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Abstract
Stroke remains a major cause of serious disability due to the brain's limited capacity to regenerate. Current treatments focus on acute recanalization of the occluded blood vessels; however, currently there are no approved therapy options to regenerate neural circuits and reduce stroke-related disability. To promote recovery, therapeutic angiogenesis has been proposed as a promising target. Although restoration of blood vessels providing oxygen and nutrients to the peri-infarct regions may be beneficial, newly generated capillaries may also carry pathophysiological risk factors that need to be considered. One major concern are adverse effects including edema formation and haemorrhagic transformation due to the comprised endothelial barrier function during vascular remodelling. This brief opinion article will discuss the challenges and the newest advancements of angiogenesis as a therapeutic strategy for ischemic stroke.
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Affiliation(s)
- Ruslan Rust
- Institute for Regenerative Medicine, University of Zurich, Zurich, Switzerland.,Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland
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152
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Functional reconstruction of injured corpus cavernosa using 3D-printed hydrogel scaffolds seeded with HIF-1α-expressing stem cells. Nat Commun 2020; 11:2687. [PMID: 32483116 PMCID: PMC7264263 DOI: 10.1038/s41467-020-16192-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 04/17/2020] [Indexed: 01/13/2023] Open
Abstract
Injury of corpus cavernosa results in erectile dysfunction, but its treatment has been very difficult. Here we construct heparin-coated 3D-printed hydrogel scaffolds seeded with hypoxia inducible factor-1α (HIF-1α)-mutated muscle-derived stem cells (MDSCs) to develop bioengineered vascularized corpora. HIF-1α-mutated MDSCs significantly secrete various angiogenic factors in MDSCs regardless of hypoxia or normoxia. The biodegradable scaffolds, along with MDSCs, are implanted into corpus cavernosa defects in a rabbit model to show good histocompatibility with no immunological rejection, support vascularized tissue ingrowth, and promote neovascularisation to repair the defects. Evaluation of morphology, intracavernosal pressure, elasticity and shrinkage of repaired cavernous tissue prove that the bioengineered corpora scaffolds repair the defects and recover penile erectile and ejaculation function successfully. The function recovery restores the reproductive capability of the injured male rabbits. Our work demonstrates that the 3D-printed hydrogels with angiogenic cells hold great promise for penile reconstruction to restore reproductive capability of males. Injury of corpus cavernosa results in erectile dysfunction, and repair leading to restoration of function is difficult. Here the authors construct 3D printed hydrogel constructs seeded with HIF-1α-expressing muscle derived stem cells to restore corpus function in a rabbit model.
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153
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Darling NJ, Xi W, Sideris E, Anderson AR, Pong C, Carmichael ST, Segura T. Click by Click Microporous Annealed Particle (MAP) Scaffolds. Adv Healthc Mater 2020; 9:e1901391. [PMID: 32329234 PMCID: PMC7340246 DOI: 10.1002/adhm.201901391] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 11/15/2019] [Indexed: 12/22/2022]
Abstract
Macroporous scaffolds are being increasingly used in regenerative medicine and tissue repair. While the recently developed microporous annealed particle (MAP) scaffolds have overcome issues with injectability and in situ hydrogel formation, limitations with respect to tunability to be able to manipulate hydrogel strength and rigidity for broad applications still exist. To address these key issues, here hydrogel microparticles (HMPs) of hyaluronic acid (HA) are synthesized using the thiol-norbornene click reaction and then HMPs are subsequently annealed into a porous scaffold using the tetrazine-norbornene click reaction. This assembly method allows for straightforward tuning of bulk scaffold rigidity by varying the tetrazine to norbornene ratio, with increasing tetrazine resulting in increasing scaffold storage modulus, Young's modulus, and maximum stress. These changes are independent of void fraction. Further incorporation of human dermal fibroblasts throughout the porous scaffold reveals the biocompatibility of this annealing strategy as well as differences in proliferation and cell-occupied volume. Finally, injection of porous HA-Tet MAP scaffolds into an ischemic stroke model shows this chemistry is biocompatible in vivo with reduced levels of inflammation and astrogliosis as previously demonstrated for other crosslinking chemistries.
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Affiliation(s)
- Nicole J. Darling
- Department of Chemical and Biomolecular Engineering, University of California Los Angeles, 420 Westwood Plaza, Los Angeles CA 90095
| | - Weixian Xi
- Department of Chemical and Biomolecular Engineering, Department of Orthopedic Surgery, University of California Los Angeles, 420 Westwood Plaza, Los Angeles CA 90095
| | - Elias Sideris
- Department Chemical and Biomolecular Engineering, University of California Los Angeles, 420 Westwood Plaza, Los Angeles CA 90095
| | - Alexa R. Anderson
- Department of Biomedical Engineering, Duke University, 101 Science Drive Campus Box 90281, Durham NC 27708-0281, United States
| | - Cassie Pong
- Department of Chemical and Biomolecular Engineering, University of California Los Angeles, 420 Westwood Plaza, Los Angeles CA 90095
| | - S. Thomas Carmichael
- Department of Neurology, David Geffen School of Medicine, University of California Los Angeles, 621 Charles Young Drive, CA 90095, USA
| | - Tatiana Segura
- Department of Biomedical Engineering, Duke University, 101 Science Drive Campus Box 90281, Durham NC 27708-0281, United States
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154
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Pradhan S, Banda OA, Farino CJ, Sperduto JL, Keller KA, Taitano R, Slater JH. Biofabrication Strategies and Engineered In Vitro Systems for Vascular Mechanobiology. Adv Healthc Mater 2020; 9:e1901255. [PMID: 32100473 PMCID: PMC8579513 DOI: 10.1002/adhm.201901255] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 01/24/2020] [Indexed: 12/17/2022]
Abstract
The vascular system is integral for maintaining organ-specific functions and homeostasis. Dysregulation in vascular architecture and function can lead to various chronic or acute disorders. Investigation of the role of the vascular system in health and disease has been accelerated through the development of tissue-engineered constructs and microphysiological on-chip platforms. These in vitro systems permit studies of biochemical regulation of vascular networks and parenchymal tissue and provide mechanistic insights into the biophysical and hemodynamic forces acting in organ-specific niches. Detailed understanding of these forces and the mechanotransductory pathways involved is necessary to develop preventative and therapeutic strategies targeting the vascular system. This review describes vascular structure and function, the role of hemodynamic forces in maintaining vascular homeostasis, and measurement approaches for cell and tissue level mechanical properties influencing vascular phenomena. State-of-the-art techniques for fabricating in vitro microvascular systems, with varying degrees of biological and engineering complexity, are summarized. Finally, the role of vascular mechanobiology in organ-specific niches and pathophysiological states, and efforts to recapitulate these events using in vitro microphysiological systems, are explored. It is hoped that this review will help readers appreciate the important, but understudied, role of vascular-parenchymal mechanotransduction in health and disease toward developing mechanotherapeutics for treatment strategies.
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Affiliation(s)
- Shantanu Pradhan
- Department of Biomedical Engineering, University of Delaware, 150 Academy Street, 161 Colburn Lab, Newark, DE, 19716, USA
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India
| | - Omar A. Banda
- Department of Biomedical Engineering, University of Delaware, 150 Academy Street, 161 Colburn Lab, Newark, DE, 19716, USA
| | - Cindy J. Farino
- Department of Biomedical Engineering, University of Delaware, 150 Academy Street, 161 Colburn Lab, Newark, DE, 19716, USA
| | - John L. Sperduto
- Department of Biomedical Engineering, University of Delaware, 150 Academy Street, 161 Colburn Lab, Newark, DE, 19716, USA
| | - Keely A. Keller
- Department of Biomedical Engineering, University of Delaware, 150 Academy Street, 161 Colburn Lab, Newark, DE, 19716, USA
| | - Ryan Taitano
- Department of Biomedical Engineering, University of Delaware, 150 Academy Street, 161 Colburn Lab, Newark, DE, 19716, USA
| | - John H. Slater
- Department of Biomedical Engineering, University of Delaware, 150 Academy Street, 161 Colburn Lab, Newark, DE, 19716, USA
- Department of Materials Science and Engineering, University of Delaware, 201 DuPont Hall, Newark, DE 19716, USA
- Delaware Biotechnology Institute, 15 Innovation Way, Newark, DE 19711, USA
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155
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Marquardt LM, Doulames VM, Wang AT, Dubbin K, Suhar RA, Kratochvil MJ, Medress ZA, Plant GW, Heilshorn SC. Designer, injectable gels to prevent transplanted Schwann cell loss during spinal cord injury therapy. SCIENCE ADVANCES 2020; 6:eaaz1039. [PMID: 32270042 PMCID: PMC7112763 DOI: 10.1126/sciadv.aaz1039] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 01/08/2020] [Indexed: 05/09/2023]
Abstract
Transplantation of patient-derived Schwann cells is a promising regenerative medicine therapy for spinal cord injuries; however, therapeutic efficacy is compromised by inefficient cell delivery. We present a materials-based strategy that addresses three common causes of transplanted cell death: (i) membrane damage during injection, (ii) cell leakage from the injection site, and (iii) apoptosis due to loss of endogenous matrix. Using protein engineering and peptide-based assembly, we designed injectable hydrogels with modular cell-adhesive and mechanical properties. In a cervical contusion model, our hydrogel matrix resulted in a greater than 700% improvement in successful Schwann cell transplantation. The combination therapy of cells and gel significantly improved the spatial distribution of transplanted cells within the endogenous tissue. A reduction in cystic cavitation and neuronal loss were also observed with substantial increases in forelimb strength and coordination. Using an injectable hydrogel matrix, therefore, can markedly improve the outcomes of cellular transplantation therapies.
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Affiliation(s)
- Laura M. Marquardt
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
- Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Vanessa M. Doulames
- Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Alice T. Wang
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Karen Dubbin
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Riley A. Suhar
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Michael J. Kratochvil
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
- Division of Infectious Diseases, Stanford University School of Medicine, Stanford CA 94305, USA
| | - Zachary A. Medress
- Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Giles W. Plant
- Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA 94305, USA
- Corresponding author. (G.W.P.); (S.C.H.)
| | - Sarah C. Heilshorn
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
- Corresponding author. (G.W.P.); (S.C.H.)
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156
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Bikmulina PY, Kosheleva NV, Shpichka AI, Efremov YM, Yusupov VI, Timashev PS, Rochev YA. Beyond 2D: effects of photobiomodulation in 3D tissue-like systems. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:1-16. [PMID: 32351077 PMCID: PMC7189416 DOI: 10.1117/1.jbo.25.4.048001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Accepted: 04/09/2020] [Indexed: 05/02/2023]
Abstract
SIGNIFICANCE Currently, various scaffolds with immobilized cells are widely used in tissue engineering and regenerative medicine. However, the physiological activity and cell viability in such constructs might be impaired due to a lack of oxygen and nutrients. Photobiomodulation (PBM) is a promising method of preconditioning cells to increase their metabolic activity and to activate proliferation or differentiation. AIM Investigation of the potential of PBM for stimulation of cell activities in hydrogels. APPROACH Mesenchymal stromal cells (MSCs) isolated from human gingival mucosa were encapsulated in modified fibrin hydrogels with different thicknesses and concentrations. Constructs with cells were subjected to a single-time exposure to red (630 nm) and near-infrared (IR) (840 nm) low-intensity irradiation. After 3 days of cultivation, the viability and physiological activity of the cells were analyzed using confocal microscopy and a set of classical tests for cytotoxicity. RESULTS The cell viability in fibrin hydrogels depended both on the thickness of the hydrogels and the concentration of gel-forming proteins. The PBM was able to improve cell viability in hydrogels. The most pronounced effect was achieved with near-IR irradiation at the 840-nm wavelength. CONCLUSIONS PBM using near-IR light can be applied for stimulation of MSCs metabolism and proliferation in hydrogel-based constructs with thicknesses up to 3 mm.
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Affiliation(s)
- Polina Y. Bikmulina
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
| | - Nastasia V. Kosheleva
- Lomonosov Moscow State University, Faculty of Biology, Moscow, Russia
- FSBSI “Institute of General Pathology and Pathophysiology,” Moscow, Russia
- FSBEI FPE “Russian Medical Academy of Continuous Professional Education,” Ministry of Healthcare of Russia, Moscow, Russia
| | - Anastasia I. Shpichka
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
- Lomonosov Moscow State University, Chemistry Department, Moscow, Russia
| | - Yuri M. Efremov
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
| | - Vladimir I. Yusupov
- Institute of Photon Technologies of FSRC “Crystallography and Photonics” RAS, Troitsk, Moscow, Russia
| | - Peter S. Timashev
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
- Lomonosov Moscow State University, Chemistry Department, Moscow, Russia
- Institute of Photon Technologies of FSRC “Crystallography and Photonics” RAS, Troitsk, Moscow, Russia
- N.N. Semenov Institute of Chemical Physics, Department of Polymers and Composites, Moscow, Russia
| | - Yury A. Rochev
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
- National University of Ireland, National Centre for Biomedical Engineering Science, Galway, Ireland
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157
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Adak A, Das G, Khan J, Mukherjee N, Gupta V, Mallesh R, Ghosh S. Extracellular Matrix (ECM)-Mimicking Neuroprotective Injectable Sulfo-Functionalized Peptide Hydrogel for Repairing Brain Injury. ACS Biomater Sci Eng 2020; 6:2287-2296. [PMID: 33455349 DOI: 10.1021/acsbiomaterials.9b01829] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Brain injury can lead to the loss of neuronal functions and connections, along with the damage of the extracellular matrix (ECM). Thus, it ultimately results in devastating long-term damage, and recovery from this damage is a challenging task. To address this issue, we have designed a sulfo-group-functionalized injectable biocompatible peptide hydrogel, which not only mimics the ECM and supports the damaged neurons but also releases a neurotrophic factor around the injured sites of the brain in the presence of the matrix metalloproteinase 9 (MMP9) enzyme. It has also been observed that the driving force of hydrogel formation is a β-sheet secondary structure and π-π stacking interactions between Phe-Phe moieties. The hydrogel is able not only to promote neurite outgrowth of PC12-derived neurons and primary neurons cultured in its presence but also to nullify the toxic effects of anti-nerve growth factor (Anti-NGF)-induced neurons. It also promotes the expression of vital neuronal markers in rat cortical primary neurons, displays substantial potential in neuroregeneration, and also promotes fast recovery of the sham injured mice brain. Increased expression of reactive astrocytes in the hippocampal dentate gyrus region of the sham injured brain clearly suggests its tremendous ability in the neural repair of the damaged brain. Thus, we can convincingly state that our hydrogel is capable of repairing brain injury by mimicking an ECM-like environment and providing neuroprotection to the damaged neurons.
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Affiliation(s)
- Anindyasundar Adak
- Organic and Medicinal Chemistry and Structural Biology and Bioinformatics Divisions, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Gaurav Das
- Organic and Medicinal Chemistry and Structural Biology and Bioinformatics Divisions, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Juhee Khan
- Organic and Medicinal Chemistry and Structural Biology and Bioinformatics Divisions, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Nabanita Mukherjee
- Department of Bioscience & Bioengineering, Indian Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar 342037, Rajasthan, India
| | - Varsha Gupta
- Organic and Medicinal Chemistry and Structural Biology and Bioinformatics Divisions, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Rathnam Mallesh
- Organic and Medicinal Chemistry and Structural Biology and Bioinformatics Divisions, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India.,Department of Bioscience & Bioengineering, Indian Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar 342037, Rajasthan, India.,National Institute of Pharmaceutical Education and Research, Kolkata, Chunilal Bhawan 168, Maniktala Main Road, Kolkata 700054, India
| | - Surajit Ghosh
- Organic and Medicinal Chemistry and Structural Biology and Bioinformatics Divisions, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India.,Department of Bioscience & Bioengineering, Indian Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar 342037, Rajasthan, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India.,National Institute of Pharmaceutical Education and Research, Kolkata, Chunilal Bhawan 168, Maniktala Main Road, Kolkata 700054, India
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158
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Zou Y, Hu J, Huang W, Ye S, Han F, Du J, Shao M, Guo R, Lin J, Zhao Y, Xiong Y, Wang X. Non-Mitogenic Fibroblast Growth Factor 1 Enhanced Angiogenesis Following Ischemic Stroke by Regulating the Sphingosine-1-Phosphate 1 Pathway. Front Pharmacol 2020; 11:59. [PMID: 32194396 PMCID: PMC7063943 DOI: 10.3389/fphar.2020.00059] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Accepted: 01/22/2020] [Indexed: 12/11/2022] Open
Abstract
Ischemic strokes account for about 80% of all strokes and are associated with a high risk of mortality. Angiogenesis of brain microvascular endothelial cells may contribute to functional restoration following ischemia. Fibroblast growth factor 1 (FGF1), a member of FGF superfamily, involved in embryonic development, angiogenesis, wound healing, and neuron survival. However, the mitogenic activity of FGF1 is known to contribute to several human pathologies, thereby questioning the safety of its clinical applications. Here, we explored the effects and mechanism of action of non-mitogenic FGF1 (nmFGF1) on angiogenesis in mice after ischemia stroke and an oxygen-glucose deprivation (OGD)-induced human brain microvascular endothelial cells (HBMECs) injury model. We found that intranasal administration nmFGF1 significantly promoted angiogenesis in mice after stroke, and significantly increased the formation of matrigel tube and promoted scratch migration in a dose-dependent manner in OGD-induced HBMECs in vitro. However, the co-administration of an FGF receptor 1 (FGFR1)-specific inhibitor PD173074 significantly reversed the effects of nmFGF1 in vitro, suggesting that nmFGF1 functions via FGFR1 activation. Moreover, nmFGF1 activated sphingosine-1-phosphate receptor 1 (S1PR1, S1P1) in mice after stroke in vivo. S1P1 protein antagonist VPC23019 and agonist FTY720 were used to confirm that nmFGF1 promotes angiogenesis in vitro partially through the S1P1 pathway. OGD induced downregulation of S1P1 expression. The S1P1 antagonist VPC23019 blocked the stimulatory effects of nmFGF1, whereas the S1P1 agonist FTY720 exerted effects comparable with those of nmFGF1. Furthermore, PD173074 reversed the effect of nmFGF1 on upregulating S1P1 signaling. In conclusion, nmFGF1 enhanced angiogenesis in mice following stroke and OGD-induced HBMECs through S1P1 pathway regulation mediated via FGFR1 activation. This new discovery suggests the potential therapeutic role of nmFGF1 for the treatment of ischemic strokes.
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Affiliation(s)
- Yuchi Zou
- The Frist Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jian Hu
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Wenting Huang
- School of the First Clinical Medical Science, Wenzhou Medical University, Wenzhou, China
| | - Shasha Ye
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Fanyi Han
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Jingting Du
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Mingjie Shao
- School of the First Clinical Medical Science, Wenzhou Medical University, Wenzhou, China
| | - Ruili Guo
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Jingjing Lin
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Yeli Zhao
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China.,Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Biomedical Collaborative Innovation Center of Wenzhou, Wenzhou, China
| | - Ye Xiong
- The Frist Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xue Wang
- The Frist Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.,School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
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159
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McCrary MR, Jesson K, Wei ZZ, Logun M, Lenear C, Tan S, Gu X, Jiang MQ, Karumbaiah L, Ping Yu S, Wei L. Cortical Transplantation of Brain-Mimetic Glycosaminoglycan Scaffolds and Neural Progenitor Cells Promotes Vascular Regeneration and Functional Recovery after Ischemic Stroke in Mice. Adv Healthc Mater 2020; 9:e1900285. [PMID: 31977165 PMCID: PMC7358896 DOI: 10.1002/adhm.201900285] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 01/08/2020] [Indexed: 12/14/2022]
Abstract
Stroke causes significant mortality and morbidity. Currently, there are no treatments which can regenerate brain tissue lost to infarction. Neural progenitor cells (NPCs) are at the forefront of preclinical studies for regenerative stroke therapies. NPCs can differentiate into and replace neurons and promote endogenous recovery mechanisms such as angiogenesis via trophic factor production and release. The stroke core is hypothetically the ideal location for replacement of neural tissue since it is in situ and develops into a potential space where injections may be targeted with minimal compression of healthy peri-infarct tissue. However, the compromised perfusion and tissue degradation following ischemia create an inhospitable environment resistant to cellular therapy. Overcoming these limitations is critical to advancing cellular therapy. In this work, the therapeutic potential of mouse-induced pluripotent stem cell derived NPCs is tested encapsulated in a basic fibroblast growth factor (bFGF) binding chondroitin sulfate-A (CS-A) hydrogel transplanted into the infarct core in a mouse sensorimotor cortex mini-stroke model. It is shown that CS-A encapsulation significantly improves vascular remodeling, cortical blood flow, and sensorimotor behavioral outcomes after stroke. It is found these improvements are negated by blocking bFGF, suggesting that the sustained trophic signaling endowed by the CS-A hydrogel combined with NPC transplantation can promote tissue repair.
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Affiliation(s)
- Myles R. McCrary
- Department of Anesthesiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA
| | - Kaleena Jesson
- Department of Anesthesiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA
| | - Zheng Z. Wei
- Department of Anesthesiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA
| | - Meghan Logun
- Regenerative Bioscience Center, University of Georgia, Athens, Georgia, USA
| | - Christopher Lenear
- Regenerative Bioscience Center, University of Georgia, Athens, Georgia, USA
| | - Stephen Tan
- Department of Anesthesiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA
| | - Xiaohuan Gu
- Department of Anesthesiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA
| | - Michael Q. Jiang
- Department of Anesthesiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA
| | | | - Shan Ping Yu
- Department of Anesthesiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA
- Center for Visual and Neurocognitive Rehabilitation, Atlanta VA Medical Center, Decatur, GA 30033, USA
| | - Ling Wei
- Department of Anesthesiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA
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160
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Excess salt intake promotes M1 microglia polarization via a p38/MAPK/AR-dependent pathway after cerebral ischemia in mice. Int Immunopharmacol 2020; 81:106176. [PMID: 32044667 DOI: 10.1016/j.intimp.2019.106176] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 11/28/2019] [Accepted: 12/30/2019] [Indexed: 11/24/2022]
Abstract
A high salt diet (HSD) is among the most important risk factors for many diseases. One mechanism by which HSD aggravates cerebral ischemic injury is independent of blood pressure changes. The direct role of HSD in inflammation after cerebral ischemia is unclear. In this research, after twenty-one days of being fed a high salt diet, permanent focal ischemia was induced in mice via operation. At 12 h and 1, 3 and 5 days postischemia, the effects of HSD on the lesion volume, microglia polarization, aldose reductase (AR) expression, and inflammatory processes were analyzed. We report that in mice, surplus dietary salt promotes inflammation and increases the activation of classical lipopolysaccharide (LPS)-induced microglia/macrophages (M1). This effect depends on the expression of the AR protein in activated microglia after permanent middle cerebral artery ligation (pMCAL) in HSD mice. The administration of either the AR inhibitor Epalrestat or a p38-neutralizing antibody blocked the polarization of microglia and alleviated stroke injury. In conclusion, HSD promotes polarization in pro-inflammatory M1 microglia by upregulating the expression of the AR protein via p38/MAPK, thereby exacerbating the development of ischemia stroke.
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161
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Galarza S, Crosby AJ, Pak C, Peyton SR. Control of Astrocyte Quiescence and Activation in a Synthetic Brain Hydrogel. Adv Healthc Mater 2020; 9:e1901419. [PMID: 31943839 DOI: 10.1002/adhm.201901419] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/26/2019] [Indexed: 12/16/2022]
Abstract
Bioengineers have designed numerous instructive brain extracellular matrix (ECM) environments with tailored and tunable protein compositions and biomechanical properties in vitro to study astrocyte reactivity during trauma and inflammation. However, a major limitation of both protein-based and synthetic model microenvironments is that astrocytes within fail to retain their characteristic stellate morphology and quiescent state without becoming activated under "normal" culture conditions. Here, a synthetic hydrogel is introduced, which for the first time demonstrates maintenance of astrocyte quiescence and activation on demand. With this synthetic brain hydrogel, the brain-specific integrin-binding and matrix metalloprotease-degradable domains of proteins are shown to control astrocyte star-shaped morphologies, and an ECM condition that maintains astrocyte quiescence with minimal activation can be achieved. In addition, activation can be induced in a dose-dependent manner via both defined cytokine cocktails and low molecular weight hyaluronic acid. This synthetic brain hydrogel is envisioned as a new tool to study the physiological role of astrocytes in health and disease.
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Affiliation(s)
- Sualyneth Galarza
- Department of Chemical Engineering University of Massachusetts Amherst MA 01003 USA
| | - Alfred J. Crosby
- Department of Polymer Science and Engineering University of Massachusetts Amherst MA 01003 USA
| | - ChangHui Pak
- Department of Biochemistry and Molecular Biology University of Massachusetts Amherst MA 01003 USA
| | - Shelly R. Peyton
- Department of Chemical Engineering University of Massachusetts Amherst MA 01003 USA
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162
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Nishiguchi A, Taguchi T. A Thixotropic, Cell-Infiltrative Nanocellulose Hydrogel That Promotes in Vivo Tissue Remodeling. ACS Biomater Sci Eng 2020; 6:946-958. [PMID: 33464861 DOI: 10.1021/acsbiomaterials.9b01549] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Injectable gels have been used in minimally invasive surgery for tissue regeneration and treatment of inflammatory diseases. However, polymeric hydrogels often fail in cell infiltration, because of the presence of dense, cross-linked molecular networks and a lack of bioactivity, which causes delayed tissue remodeling. Here, we report a thixotropic, cell-infiltrative hydrogel of biofunctionalized nanocellulose that topologically enhances cell infiltration and biochemically upregulates cellular activity for the promotion of tissue remodeling. Biodegradable, sulfonated nanocellulose forms a nanofibrous hydrogel, mimicking cellular microenvironments through cross-linking between nanocellulose and gelatin. Resulting nanocellulose hydrogels showed thixotropy, allowing for single syringe injection. Nanofiber-based hydrogels possess high molecular permeability, which is due to nanoporous structures. Sulfonate groups on nanocellulose increase protein adsorption and induce cellular extension in vitro. Highly sulfonated nanocellulose hydrogels enhanced cell infiltration and vascularization upon implantation into rats. Macrophage polarization to M2 was observed in nanocellulose hydrogels, which may be involved in tissue remodeling. Injectable, biofunctionalized nanocellulose gels have enormous potential as artificial biomatrices to heal inflammatory diseases through manipulation of the immune system and promotion of tissue remodeling.
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Affiliation(s)
- Akihiro Nishiguchi
- Biomaterials Field, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Tetsushi Taguchi
- Biomaterials Field, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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163
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The use of bioactive matrices in regenerative therapies for traumatic brain injury. Acta Biomater 2020; 102:1-12. [PMID: 31751809 DOI: 10.1016/j.actbio.2019.11.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 10/22/2019] [Accepted: 11/13/2019] [Indexed: 01/01/2023]
Abstract
Functional deficits due to neuronal loss are a common theme across multiple neuropathologies, including traumatic brain injury (TBI). Apart from mitigating cell death, another approach to treating brain injuries involves re-establishing the neural circuitry at the lesion site by utilizing exogeneous and/or endogenous stem cells to achieve functional recovery. While there has been limited success, the emergence of new bioactive matrices that promote neural repair introduces new perspectives on the development of regenerative therapies for TBI. This review briefly discusses current development on cell-based therapies and the use of bioactive matrices, hydrogels in particular, when incorporated in regenerative therapies. Desirable characteristics of bioactive matrices that have been shown to augment neural repair in TBI models were identified and further discussed. Understanding the relative outcomes of newly developed biomaterials implanted in vivo can better guide the development of biomaterials as a therapeutic strategy, for biomaterial-based cellular therapies are still in their nascent stages. Nonetheless, the value of bioactive matrices as a treatment for acute brain injuries should be appreciated and further developed. STATEMENT OF SIGNIFICANCE: Cell-based therapies have received attention as an alternative therapeutic strategy to improve clinical outcome post-traumatic brain injury but have achieved limited success. Whilst the incorporation of newly developed biomaterials in regenerative therapies has shown promise in augmenting neural repair, studies have revealed new hurdles which must be overcome to improve their therapeutic efficacy. This review discusses the recent development of cell-based therapies with a specific focus on the use of bioactive matrices in the form of hydrogels, to complement cell transplantation within the injured brain. Moreover, this review consolidates in vivo animal studies that demonstrate relative functional outcome upon the implantation of different biomaterials to highlight their desirable traits to guide their development for regenerative therapies in traumatic brain injury.
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164
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Browne S, Hossainy S, Healy K. Hyaluronic Acid Macromer Molecular Weight Dictates the Biophysical Properties and in Vitro Cellular Response to Semisynthetic Hydrogels. ACS Biomater Sci Eng 2020; 6:1135-1143. [PMID: 33464856 DOI: 10.1021/acsbiomaterials.9b01419] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In situ-forming hydrogels present a promising approach for minimally invasive cell transplantation and tissue regeneration. Among prospective materials, hyaluronic acid (HyA) has displayed great potential, owing to its inherent biocompatibility, biodegradation, and ease of chemical modification. However, current studies in the literature use a broad range of HyA macromer molecular weights (MWs) from <100 kDa to 1 MDa with no consensus regarding an optimal MW for a specific application. We investigated the effects of different HyA macromer MWs on key biophysical properties of semisynthetic hydrogels, such as viscosity, gelation time, shear storage modulus, molecular diffusion, and degradation. Using higher-MW HyA macromers leads to quicker gelation times and stiffer, more stable hydrogels with smaller mesh sizes. Assessment of the potential for HyA hydrogels to support network formation by encapsulated vascular cells derived from human-induced pluripotent stem cells reveals key differences between HyA hydrogels dependent on macromer MW. These effects must be considered holistically to address the multifaceted, nonmonotonic nature of HyA MW on hydrogel behavior. Our study identified an intermediate HyA macromer MW of 500 kDa as providing optimal conditions for a readily injectable, in situ-forming hydrogel with appropriate biophysical properties to promote vascular cell spreading and sustain vascular network formation in vitro.
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165
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Belousov A, Titov S, Shved N, Garbuz M, Malykin G, Gulaia V, Kagansky A, Kumeiko V. The Extracellular Matrix and Biocompatible Materials in Glioblastoma Treatment. Front Bioeng Biotechnol 2019; 7:341. [PMID: 31803736 PMCID: PMC6877546 DOI: 10.3389/fbioe.2019.00341] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 10/30/2019] [Indexed: 02/06/2023] Open
Abstract
During cancer genesis, the extracellular matrix (ECM) in the human brain undergoes important transformations, starting to resemble embryonic brain cell milieu with a much denser structure. However, the stiffness of the tumor ECM does not preclude cancer cells from migration. The importance of the ECM role in normal brain tissue as well as in tumor homeostasis has engaged much effort in trials to implement ECM as a target and an instrument in the treatment of brain cancers. This review provides a detailed analysis of both experimental and applied approaches in combined therapy for gliomas in adults. In general, matrix materials for glioma treatment should have properties facilitating the simplest delivery into the body. Hence, to deliver an artificial implant directly into the operation cavity it should be packed into a gel form, while for bloodstream injections matrix needs to be in the form of polymer micelles, nanoparticles, etc. Furthermore, the delivered material should mimic biomechanical properties of the native tissue, support vital functions, and slow down or stop the proliferation of surrounding cells for a prolonged period. The authors propose a two-step approach aimed, on the one hand, at elimination of remaining cancer cells and on the other hand, at restoring normal brain tissue. Thereby, the first bioartificial matrix to be applied should have relatively low elastic modulus should be loaded with anticancer drugs, while the second material with a higher elastic modulus for neurite outgrowth support should contain specific factors stimulating neuroregeneration.
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Affiliation(s)
- Andrei Belousov
- School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Sergei Titov
- School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- School of Natural Sciences, Far Eastern Federal University, Vladivostok, Russia
| | - Nikita Shved
- School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
| | - Mikhail Garbuz
- School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Grigorii Malykin
- School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
| | - Valeriia Gulaia
- School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Alexander Kagansky
- School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Vadim Kumeiko
- School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- School of Natural Sciences, Far Eastern Federal University, Vladivostok, Russia
- A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
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166
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Abstract
Brain tissue lost after a stroke is not regenerated, although a repair response associated with neurogenesis does occur. A failure to regenerate functional brain tissue is not caused by the lack of available neural cells, but rather the absence of structural support to permit a repopulation of the lesion cavity. Inductive bioscaffolds can provide this support and promote the invasion of host cells into the tissue void. The putative mechanisms of bioscaffold degradation and its pivotal role to permit invasion of neural cells are reviewed and discussed in comparison to peripheral wound healing. Key differences between regenerating and non-regenerating tissues are contrasted in an evolutionary context, with a special focus on the neurogenic response as a conditio sine qua non for brain regeneration. The pivotal role of the immune system in biodegradation and the formation of a neovasculature are contextualized with regeneration of peripheral soft tissues. The application of rehabilitation to integrate newly forming brain tissue is suggested as necessary to develop functional tissue that can alleviate behavioral impairments. Pertinent aspects of brain tissue development are considered to provide guidance to produce a metabolically and functionally integrated de novo tissue. Although little is currently known about mechanisms involved in brain tissue regeneration, this review outlines the various components and their interplay to provide a framework for ongoing and future studies. It is envisaged that a better understanding of the mechanisms involved in brain tissue regeneration will improve the design of biomaterials and the methods used for implantation, as well as rehabilitation strategies that support the restoration of behavioral functions.
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Affiliation(s)
- Michel Modo
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, United States,Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA, United States,Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, United States,Department of Radiology, University of Pittsburgh, Pittsburgh, PA, United States,*Correspondence: Michel Modo,
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167
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Jiang L, Wang Y, Liu Z, Ma C, Yan H, Xu N, Gang F, Wang X, Zhao L, Sun X. Three-Dimensional Printing and Injectable Conductive Hydrogels for Tissue Engineering Application. TISSUE ENGINEERING PART B-REVIEWS 2019; 25:398-411. [PMID: 31115274 DOI: 10.1089/ten.teb.2019.0100] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The goal of tissue engineering scaffolds is to simulate the physiological microenvironment, in which the electrical microenvironment is an important part. Hydrogel is an ideal material for tissue engineering scaffolds because of its soft, porous, water-bearing, and other extracellular matrix-like properties. However, the hydrogel matrix is usually not conductive and can hinder the communication of electrical signals between cells, which promotes researchers' attention to conductive hydrogels. Conductive hydrogels can promote the communication of electrical signals between cells and simulate the physiological microenvironment of electroactive tissues. Hydrogel formation is an important step for the application of hydrogels in tissue engineering. In situ forming of injectable hydrogels and customized forming of three-dimensional (3D) printing hydrogels represent two most potential advanced forming processes, respectively. In this review, we discuss (i) the classification, properties, and advantages of conductive hydrogels, (ii) the latest development of conductive hydrogels applied in myocardial, nerve, and bone tissue engineering, (iii) advanced forming processes, including injectable conductive hydrogels in situ and customized 3D printed conductive hydrogels, (iv) the challenges and opportunities of conductive hydrogels for tissue engineering. Impact Statement Biomimetic construction of electro-microenvironment is a challenge of tissue engineering. The development of conductive hydrogels provides possibility for the construction of biomimetic electro-microenvironment. However, the importance of conductive hydrogels in tissue engineering has not received enough attention so far. Herein, various conductive hydrogels and their tissue engineering applications are systematically reviewed. Two potential methods of conductive hydrogel forming, in situ forming of injectable conductive hydrogels and customized forming of three-dimensional printing conductive hydrogels, are introduced. The current challenges and future development directions of conductive hydrogels are comprehensively overviewed. This review provides a guideline for tissue engineering applications of conductive hydrogels.
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Affiliation(s)
- Le Jiang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China
| | - Yingjin Wang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China
| | - Zhongqun Liu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China
| | - Chunyang Ma
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China
| | - Hao Yan
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China
| | - Nan Xu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China
| | - Fangli Gang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,College of Chemistry and Pharmacy, Shaanxi Key Laboratory of Natural Products and Chemical Biology, Northwest A&F University, Yangling, People's Republic of China
| | - Xiumei Wang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China
| | - Lingyun Zhao
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China
| | - Xiaodan Sun
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, People's Republic of China
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168
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Ham TR, Cox DG, Leipzig ND. Concurrent Delivery of Soluble and Immobilized Proteins to Recruit and Differentiate Neural Stem Cells. Biomacromolecules 2019; 20:3445-3452. [PMID: 31460746 DOI: 10.1021/acs.biomac.9b00719] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Insufficient endogenous neural stem cell (NSC) migration to injury sites and incomplete replenishment of neurons complicates recovery following central nervous system (CNS) injury. Such insufficient migration can be addressed by delivering soluble chemotactic factors, such as stromal cell-derived factor 1-α (SDF-1α), to sites of injury. However, simply enhancing NSC migration is likely to result in insufficient regeneration, as the cells need to be given additional signals. Immobilized proteins, such as interferon-γ (IFN-γ) can encourage neurogenic differentiation of NSCs. Here, we combined both protein delivery paradigms: soluble SDF-1α delivery to enhance NSC migration alongside covalently tethered IFN-γ to differentiate the recruited NSCs into neurons. To slow the release of soluble SDF-1α, we copolymerized methacrylated heparin with methacrylamide chitosan (MAC), to which we tethered IFN-γ. We found that this hydrogel system could result in soft hydrogels with a ratio of up to 70:30 MAC/heparin by mass, which enabled the continuous release of SDF-1α over a period of 2 weeks. The hydrogels recruited NSCs in vitro over 2 weeks, proportional to their release rate: the 70:30 heparin gels recruited a consistent number of NSCs at each time point, while the formulations with less heparin recruited NSCs at only early time points. After remaining in contact with the hydrogels for 8 days, NSCs successfully differentiated into neurons. CNS regeneration is a complex challenge, and this system provides a foundation to address multiple aspects of that challenge.
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Affiliation(s)
- Trevor R Ham
- Department of Biomedical Engineering, Auburn Science and Engineering Center 275, West Tower , The University of Akron , Akron , Ohio 44325 , United States
| | - Dakotah G Cox
- Department of Chemical and Biomolecular Engineering, Whitby 211 , The University of Akron , Akron , Ohio 44325 , United States
| | - Nic D Leipzig
- Department of Biomedical Engineering, Auburn Science and Engineering Center 275, West Tower , The University of Akron , Akron , Ohio 44325 , United States.,Department of Chemical and Biomolecular Engineering, Whitby 211 , The University of Akron , Akron , Ohio 44325 , United States
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169
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Bolan F, Louca I, Heal C, Cunningham CJ. The Potential of Biomaterial-Based Approaches as Therapies for Ischemic Stroke: A Systematic Review and Meta-Analysis of Pre-clinical Studies. Front Neurol 2019; 10:924. [PMID: 31507524 PMCID: PMC6718570 DOI: 10.3389/fneur.2019.00924] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 08/09/2019] [Indexed: 01/07/2023] Open
Abstract
Background: In recent years pre-clinical stroke research has shown increased interest in the development of biomaterial-based therapies to promote tissue repair and functional recovery. Such strategies utilize biomaterials as structural support for tissue regeneration or as delivery vehicles for therapeutic agents. While a range of biomaterials have been tested in stroke models, currently no overview is available for evaluating the benefit of these approaches. We therefore performed a systematic review and meta-analysis of studies investigating the use of biomaterials for the treatment of stroke in experimental animal models. Methods: Studies were identified by searching electronic databases (PubMed, Web of Science) and reference lists of relevant review articles. Studies reporting lesion volume and/or neurological score were included. Standardized mean difference (SMD) and 95% confidence intervals were calculated using DerSimonian and Laird random effects. Study quality and risk of bias was assessed using the CAMARADES checklist. Publication bias was visualized by funnel plots followed by trim and fill analysis of missing publications. Results: A total of 66 publications were included in the systematic review, of which 44 (86 comparisons) were assessed in the meta-analysis. Overall, biomaterial-based interventions improved both lesion volume (SMD: -2.98, 95% CI: -3.48, -2.48) and neurological score (SMD: -2.3, 95% CI: -2.85, -1.76). The median score on the CAMARADES checklist was 5.5/10 (IQR 4.25-6). Funnel plots of lesion volume and neurological score data revealed pronounced asymmetry and publication bias. Additionally, trim and fill analysis estimated 19 "missing" studies for the lesion volume outcome adjusting the effect size to -1.91 (95% CI: -2.44, -1.38). Conclusions: Biomaterials including scaffolds and particles exerted a positive effect on histological and neurological outcomes in pre-clinical stroke models. However, heterogeneity in the field, publication bias and study quality scores which may be another source of bias call for standardization of outcome measures and improved study reporting.
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Affiliation(s)
- Faye Bolan
- Division of Neuroscience and Experimental Psychology, Faculty of Biology, Medicine and Health, School of Biological Sciences, University of Manchester, Manchester, United Kingdom
| | - Irene Louca
- Division of Neuroscience and Experimental Psychology, Faculty of Biology, Medicine and Health, School of Biological Sciences, University of Manchester, Manchester, United Kingdom
| | - Calvin Heal
- Faculty of Biology, Medicine and Health, Centre for Biostatistics, Academic Health Sciences Centre, University of Manchester, Manchester, United Kingdom
| | - Catriona J. Cunningham
- Division of Neuroscience and Experimental Psychology, Faculty of Biology, Medicine and Health, School of Biological Sciences, University of Manchester, Manchester, United Kingdom,*Correspondence: Catriona J. Cunningham
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170
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Lim TC, Mandeville E, Weng D, Wang LS, Kurisawa M, Leite-Morris K, Selim MH, Lo EH, Spector M. Hydrogel-Based Therapy for Brain Repair After Intracerebral Hemorrhage. Transl Stroke Res 2019; 11:412-417. [DOI: 10.1007/s12975-019-00721-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 07/04/2019] [Accepted: 07/15/2019] [Indexed: 01/30/2023]
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171
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172
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173
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Liaw K, Zhang Z, Kannan S. Neuronanotechnology for brain regeneration. Adv Drug Deliv Rev 2019; 148:3-18. [PMID: 31668648 DOI: 10.1016/j.addr.2019.04.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 02/16/2019] [Accepted: 04/15/2019] [Indexed: 12/16/2022]
Abstract
Identifying and harnessing regenerative pathways while suppressing the growth-inhibiting processes of the biological response to injury is the central goal of stimulating neurogenesis after central nervous system (CNS) injury. However, due to the complexity of the mature CNS involving a plethora of cellular pathways and extracellular cues, as well as difficulties in accessibility without highly invasive procedures, clinical successes of regenerative medicine for CNS injuries have been extremely limited. Current interventions primarily focus on stabilization and mitigation of further neuronal death rather than direct stimulation of neurogenesis. In the past few decades, nanotechnology has offered substantial innovations to the field of regenerative medicine. Their nanoscale features allow for the fine tuning of biological interactions for enhancing drug delivery and stimulating cellular processes. This review gives an overview of nanotechnology applications in CNS regeneration organized according to cellular and extracellular targets and discuss future directions for the field.
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174
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Xu D, Wu D, Qin M, Nih LR, Liu C, Cao Z, Ren J, Chen X, He Z, Yu W, Guan J, Duan S, Liu F, Liu X, Li J, Harley D, Xu B, Hou L, Chen ISY, Wen J, Chen W, Pourtaheri S, Lu Y. Efficient Delivery of Nerve Growth Factors to the Central Nervous System for Neural Regeneration. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1900727. [PMID: 31125138 DOI: 10.1002/adma.201900727] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 04/09/2019] [Indexed: 06/09/2023]
Abstract
The central nervous system (CNS) plays a central role in the control of sensory and motor functions, and the disruption of its barriers can result in severe and debilitating neurological disorders. Neurotrophins are promising therapeutic agents for neural regeneration in the damaged CNS. However, their penetration across the blood-brain barrier remains a formidable challenge, representing a bottleneck for brain and spinal cord therapy. Herein, a nanocapsule-based delivery system is reported that enables intravenously injected nerve growth factor (NGF) to enter the CNS in healthy mice and nonhuman primates. Under pathological conditions, the delivery of NGF enables neural regeneration, tissue remodeling, and functional recovery in mice with spinal cord injury. This technology can be utilized to deliver other neurotrophins and growth factors to the CNS, opening a new avenue for tissue engineering and the treatment of CNS disorders and neurodegenerative diseases.
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Affiliation(s)
- Duo Xu
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Di Wu
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Meng Qin
- Department of Microbiology, Immunology, and Molecular Genetics, UCLA AIDS Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- College of Life Science and Technology, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Biotechnology, Beijing, 100029, China
| | - Lina R Nih
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Chaoyong Liu
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- College of Life Science and Technology, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Biotechnology, Beijing, 100029, China
| | - Zheng Cao
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Jie Ren
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Xiangjun Chen
- Department of Neurology, Huashan Hospital, Shanghai, 200040, China
| | - Zhanlong He
- Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, 650118, China
| | - Wenhai Yu
- Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, 650118, China
| | - Jiaoqiong Guan
- Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, 650118, China
| | - Suqin Duan
- Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, 650118, China
| | - Fang Liu
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Xiangsheng Liu
- California NanoSystem Institute, Los Angeles, CA, 90095, USA
| | - Jesse Li
- Department of Orthopaedic Surgery, University of California, Los Angeles, CA, 90095, USA
| | - Dushawn Harley
- Department of Orthopaedic Surgery, University of California, Los Angeles, CA, 90095, USA
| | - Bin Xu
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, Jilin, 130012, China
| | - Lihua Hou
- Beijing Institute of Biotechnology, Beijing, 100029, China
| | - Irvin S Y Chen
- Department of Microbiology, Immunology, and Molecular Genetics, UCLA AIDS Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Jing Wen
- Department of Microbiology, Immunology, and Molecular Genetics, UCLA AIDS Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Wei Chen
- Beijing Institute of Biotechnology, Beijing, 100029, China
| | - Sina Pourtaheri
- Department of Orthopaedic Surgery, University of California, Los Angeles, CA, 90095, USA
| | - Yunfeng Lu
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
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175
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Yao R, Alkhawtani AYF, Chen R, Luan J, Xu M. Rapid and efficient in vivo angiogenesis directed by electro-assisted bioprinting of alginate/collagen microspheres with human umbilical vein endothelial cell coating layer. Int J Bioprint 2019; 5:194. [PMID: 32596542 PMCID: PMC7310271 DOI: 10.18063/ijb.v5i2.1.194] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Accepted: 05/16/2019] [Indexed: 12/15/2022] Open
Abstract
Rapid reconstruction of functional microvasculature is the urgent challenge of regenerative medicine and ischemia therapy development. The purpose of this study was to provide an alternative solution for obtaining functional blood vessel networks in vivo, through assessing whether hydrogel-based microspheres coated by human umbilical vein endothelial cells (HUVECs) can direct rapid and efficient in vivo angiogenesis without the addition of exogenous growth factors or other supporting cells. Uniform alginate microspheres with adjustable diameter were biofabricated by electro-assisted bioprinting technology. Collagen fibrils were evenly coated on the surface of alginate microspheres through simple self-assembly procedure, and collagen concentration is optimized to achieve the highest HUVECs adhesion and proliferation. Immunofluorescence staining and gene analysis confirmed the formation of the prevascularized tubular structure and significantly enhanced endothelial gene expression. HUVECs-coated hydrogel microspheres with different diameters were subcutaneously injected in immune-deficient mice, which demonstrated rapid blood vessel regeneration and functional anastomosis with host blood vessels within 1 week. Besides, microsphere diameter demonstrated influence on blood vessel density with statistical differences but showed no obvious influence on the area occupied by blood vessels. This study provided a powerful tool for rapid and minimal-invasion angiogenesis of bioprinting constructs and a potential method for vascularized tissue regeneration and ischemia treatment with clinically relevant dimensions.
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Affiliation(s)
- Rui Yao
- Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China
| | - Ahmed Yousef F. Alkhawtani
- Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China
| | - Ruoyu Chen
- Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China
| | - Jie Luan
- Plastic Surgery Hospital, Peking Union Medical College, Beijing, 100144, People’s Republic of China
| | - Mingen Xu
- Key Laboratory of Medical Information and Three-dimensional Bioprinting of Zhejiang Province, Hangzhou Dianzi University, Hangzhou 310018, China
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176
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Nogo-A targeted therapy promotes vascular repair and functional recovery following stroke. Proc Natl Acad Sci U S A 2019; 116:14270-14279. [PMID: 31235580 DOI: 10.1073/pnas.1905309116] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Stroke is a major cause of serious disability due to the brain's limited capacity to regenerate damaged tissue and neuronal circuits. After ischemic injury, a multiphasic degenerative and inflammatory response is coupled with severely restricted vascular and neuronal repair, resulting in permanent functional deficits. Although clinical evidence indicates that revascularization of the ischemic brain regions is crucial for functional recovery, no therapeutics that promote angiogenesis after cerebral stroke are currently available. Besides vascular growth factors, guidance molecules have been identified to regulate aspects of angiogenesis in the central nervous system (CNS) and may provide targets for therapeutic angiogenesis. In this study, we demonstrate that genetic deletion of the neurite outgrowth inhibitor Nogo-A or one of its corresponding receptors, S1PR2, improves vascular sprouting and repair and reduces neurological deficits after cerebral ischemia in mice. These findings were reproduced in a therapeutic approach using intrathecal anti-Nogo-A antibodies; such a therapy is currently in clinical testing for spinal cord injury. These results provide a basis for a therapeutic blockage of inhibitory guidance molecules to improve vascular and neural repair after ischemic CNS injuries.
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177
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Hettiaratchi MH, Shoichet MS. Modulated Protein Delivery to Engineer Tissue Repair. Tissue Eng Part A 2019; 25:925-930. [PMID: 30848169 DOI: 10.1089/ten.tea.2019.0066] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
IMPACT STATEMENT Achieving targeted protein delivery to injured tissues is a core focus of the field of tissue engineering and has enormous clinical potential. This article highlights significant advances made in biomaterial-based protein delivery strategies over the last 25 years and how they will influence research in the next 25 years. These advances will enable protein release rates to be tuned with increased flexibility to deliberately address the challenges of the dynamic injury environment and ultimately lead to better solutions for patients.
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Affiliation(s)
- Marian H Hettiaratchi
- 1Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Canada.,2Terrence Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, Canada
| | - Molly S Shoichet
- 1Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Canada.,2Terrence Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, Canada.,3Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Canada.,4Department of Chemistry, University of Toronto, Toronto, Canada
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178
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Abstract
The ability to generate new microvessels in desired numbers and at desired locations has been a long-sought goal in vascular medicine, engineering, and biology. Historically, the need to revascularize ischemic tissues nonsurgically (so-called therapeutic vascularization) served as the main driving force for the development of new methods of vascular growth. More recently, vascularization of engineered tissues and the generation of vascularized microphysiological systems have provided additional targets for these methods, and have required adaptation of therapeutic vascularization to biomaterial scaffolds and to microscale devices. Three complementary strategies have been investigated to engineer microvasculature: angiogenesis (the sprouting of existing vessels), vasculogenesis (the coalescence of adult or progenitor cells into vessels), and microfluidics (the vascularization of scaffolds that possess the open geometry of microvascular networks). Over the past several decades, vascularization techniques have grown tremendously in sophistication, from the crude implantation of arteries into myocardial tunnels by Vineberg in the 1940s, to the current use of micropatterning techniques to control the exact shape and placement of vessels within a scaffold. This review provides a broad historical view of methods to engineer the microvasculature, and offers a common framework for organizing and analyzing the numerous studies in this area of tissue engineering and regenerative medicine. © 2019 American Physiological Society. Compr Physiol 9:1155-1212, 2019.
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Affiliation(s)
- Joe Tien
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts, USA
- Division of Materials Science and Engineering, Boston University, Brookline, Massachusetts, USA
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179
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Park GK, Kim SH, Kim K, Das P, Kim BG, Kashiwagi S, Choi HS, Hwang NS. Dual-Channel Fluorescence Imaging of Hydrogel Degradation and Tissue Regeneration in the Brain. Theranostics 2019; 9:4255-4264. [PMID: 31285760 PMCID: PMC6599647 DOI: 10.7150/thno.35606] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 05/06/2019] [Indexed: 11/26/2022] Open
Abstract
The ability of brain tissue to regenerate is limited; therefore, brain diseases (i.e., trauma, stroke, tumors) often lead to irreversible motor and cognitive impairments. Therapeutic interventions using various types of injectable biomaterials have been investigated to promote endogenous neural differentiation. Despite promising results in pre-clinical studies, the translation of regenerative medicine to the clinic has many challenges due to the lack of reliable imaging systems to achieve accurate evaluation of the treatment efficacy. Methods: In this study, we developed a dual-channel fluorescence imaging technique to simultaneously monitor tissue ingrowth and scaffold disintegration. Enzymatically crosslinked gelatin-hyaluronic acid hydrogel was labeled with 800 nm fluorophore, ZW800-3a, while the regenerated tissue was highlighted with 700 nm brain-specific contrast agent, Ox1. Results: Using the multichannel fluorescence imaging system, tissue growth and degradation of the NIR hydrogel were simultaneously imaged in the brain of mice. Images were further analyzed and reconstructed to show both visual and quantitative information of each stage of a therapeutic period. Conclusion: Dual-channel in vivo imaging systems can provide highly accurate visual and quantitative information of the brain tissue ingrowth for the evaluation of the therapeutic effect of NIR hydrogel through a simple and fast operating procedure.
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180
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Modo M, Badylak SF. A roadmap for promoting endogenous in situ tissue restoration using inductive bioscaffolds after acute brain injury. Brain Res Bull 2019; 150:136-149. [PMID: 31128250 DOI: 10.1016/j.brainresbull.2019.05.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 05/10/2019] [Accepted: 05/17/2019] [Indexed: 02/08/2023]
Abstract
The regeneration of brain tissue remains one of the greatest unsolved challenges in medicine and by many is considered unfeasible. Indeed, the adult mammalian brain does not regenerate tissue, but there is ongoing endogenous neurogenesis, which is upregulated after injury and contributes to tissue repair. This endogenous repair response is a conditio sine que non for tissue regeneration. However, scarring around the lesion core and cavitation provide unfavorable conditions for tissue regeneration in the brain. Based on the success of using extracellular matrix (ECM)-based bioscaffolds in peripheral soft tissue regeneration, it is plausible that the provision of an inductive ECM-based hydrogel inside the volumetric tissue loss can attract neural cells and create a de novo viable tissue. Following perturbation theory of these successes in peripheral tissues, we here propose 9 perturbation parts (i.e. requirements) that can be solved independently to create an integrated series to build a functional and integrated de novo neural tissue. Necessities for tissue formation, anatomical and functional connectivity are further discussed to provide a new substrate to support the improvement of behavioral impairments after acute brain injury. We also consider potential parallel developments of this tissue engineering effort that can support therapeutic benefits in the absence of de novo tissue formation (e.g. structural support to veterate brain tissue). It is envisaged that eventually top-down inductive "natural" bioscaffolds composed of decellularized tissues (i.e. ECM) will be replaced by bottom-up synthetic designer hydrogels that will provide very defined structural and signaling properties, potentially even opening up opportunities we currently do not envisage using natural materials.
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Affiliation(s)
- Michel Modo
- University of Pittsburgh, McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania, USA; University of Pittsburgh, Department of Bioengineering, Pittsburgh, PA, USA; University of Pittsburgh, Department of Radiology, Pittsburgh, PA, USA.
| | - Stephen F Badylak
- University of Pittsburgh, McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania, USA; University of Pittsburgh, Department of Bioengineering, Pittsburgh, PA, USA; University of Pittsburgh, Department of Surgery, Pittsburgh, PA, USA
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181
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Lu Y, Li C, Chen Q, Liu P, Guo Q, Zhang Y, Chen X, Zhang Y, Zhou W, Liang D, Zhang Y, Sun T, Lu W, Jiang C. Microthrombus-Targeting Micelles for Neurovascular Remodeling and Enhanced Microcirculatory Perfusion in Acute Ischemic Stroke. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1808361. [PMID: 30957932 DOI: 10.1002/adma.201808361] [Citation(s) in RCA: 95] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 03/13/2019] [Indexed: 06/09/2023]
Abstract
Reperfusion injury exists as the major obstacle to full recovery of neuron functions after ischemic stroke onset and clinical thrombolytic therapies. Complex cellular cascades including oxidative stress, neuroinflammation, and brain vascular impairment occur within neurovascular units, leading to microthrombus formation and ultimate neuron death. In this work, a multitarget micelle system is developed to simultaneously modulate various cell types involved in these events. Briefly, rapamycin is encapsulated in self-assembled micelles that are consisted of reactive oxygen species (ROS)-responsive and fibrin-binding polymers to achieve micelle retention and controlled drug release within the ischemic lesion. Neuron survival is reinforced by the combination of micelle facilitated ROS elimination and antistress signaling pathway interference under ischemia conditions. In vivo results demonstrate an overall remodeling of neurovascular unit through micelle polarized M2 microglia repair and blood-brain barrier preservation, leading to enhanced neuroprotection and blood perfusion. This strategy gives a proof of concept that neurovascular units can serve as an integrated target for ischemic stroke treatment with nanomedicines.
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Affiliation(s)
- Yifei Lu
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
- National Pharmaceutical Engineering and Research Center, China State Institute of Pharmaceutical Industry, Shanghai, 201203, China
| | - Chao Li
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Qinjun Chen
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Peixin Liu
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Qin Guo
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Yu Zhang
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Xinli Chen
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Yujie Zhang
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Wenxi Zhou
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Donghui Liang
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Yiwen Zhang
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Tao Sun
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Weigen Lu
- National Pharmaceutical Engineering and Research Center, China State Institute of Pharmaceutical Industry, Shanghai, 201203, China
| | - Chen Jiang
- Key Laboratory of Smart Drug Delivery, Ministry of Education, State Key Laboratory of Medical Neurobiology, Department of Pharmaceutics, School of Pharmacy, Fudan University, Shanghai, 201203, China
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182
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Tang JD, Roloson EB, Amelung CD, Lampe KJ. Rapidly Assembling Pentapeptides for Injectable Delivery (RAPID) Hydrogels as Cytoprotective Cell Carriers. ACS Biomater Sci Eng 2019; 5:2117-2121. [DOI: 10.1021/acsbiomaterials.9b00389] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- James D. Tang
- Department of Chemical Engineering, University of Virginia, 102 Engineers’ Way, Charlottesville, Virginia 22904, United States
| | - Emily B. Roloson
- Department of Biomedical Engineering, University of Virginia, 415 Lane Road, Charlottesville, Virginia 22904, United States
| | - Connor D. Amelung
- Department of Biomedical Engineering, University of Virginia, 415 Lane Road, Charlottesville, Virginia 22904, United States
| | - Kyle J. Lampe
- Department of Chemical Engineering, University of Virginia, 102 Engineers’ Way, Charlottesville, Virginia 22904, United States
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183
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Fujioka T, Kaneko N, Sawamoto K. Blood vessels as a scaffold for neuronal migration. Neurochem Int 2019; 126:69-73. [PMID: 30851365 DOI: 10.1016/j.neuint.2019.03.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 02/27/2019] [Accepted: 03/02/2019] [Indexed: 12/19/2022]
Abstract
Neurogenesis and angiogenesis share regulatory factors that contribute to the formation of vascular networks and neuronal circuits in the brain. While crosstalk mechanisms between neural stem cells (NSCs) and the vasculature have been extensively investigated, recent studies have provided evidence that blood vessels also play an essential role in neuronal migration in the brain during development and regeneration. The mechanisms of the neuronal migration along blood vessels, referred to as "vascular-guided migration," are now being elucidated. The vascular endothelial cells secrete soluble factors that attract and promote neuronal migration in collaboration with astrocytes that enwrap the blood vessels. In addition, especially in the adult brain, the blood vessels serve as a migration scaffold for adult-born immature neurons generated in the ventricular-subventricular zone (V-SVZ), a germinal zone surrounding the lateral ventricles. The V-SVZ-derived immature neurons use the vascular scaffold to assist their migration toward an injured area after ischemic stroke, and contribute to neuronal regeneration. Here we review the current knowledge about the role of vasculature in neuronal migration and the molecular mechanisms controlling this process. While most of this research has been done in rodents, a comprehensive understanding of vasculature-guided neuronal migration could contribute to new therapeutic approaches for increasing new neurons in the brain after injury.
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Affiliation(s)
- Teppei Fujioka
- Department of Developmental and Regenerative Biology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan; Department of Neurology and Neuroscience, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
| | - Naoko Kaneko
- Department of Developmental and Regenerative Biology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
| | - Kazunobu Sawamoto
- Department of Developmental and Regenerative Biology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan; Division of Neural Development and Regeneration, National Institute for Physiological Sciences, Okazaki, Aichi, 444-8585, Japan.
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184
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Oh B, George P. Conductive polymers to modulate the post-stroke neural environment. Brain Res Bull 2019; 148:10-17. [PMID: 30851354 DOI: 10.1016/j.brainresbull.2019.02.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 02/12/2019] [Accepted: 02/26/2019] [Indexed: 12/24/2022]
Abstract
Despite the prevalence of stroke, therapies to augment recovery remain limited. Here we focus on the use of conductive polymers for cell delivery, drug release, and electrical stimulation to optimize the post-stroke environment for neural recovery. Conductive polymers and their interactions with in vitro and in vivo neural systems are explored. The ability to continuously modify the neural environment utilizing conductive polymers provides applications in directing stem cell differentiation and increasing neural repair. This exciting class of polymers offers new approaches to optimizing the post-stroke brain to improve functional recovery.
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Affiliation(s)
- Byeongtaek Oh
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Paul George
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA.
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185
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Myelinated axons and functional blood vessels populate mechanically compliant rGO foams in chronic cervical hemisected rats. Biomaterials 2019; 192:461-474. [DOI: 10.1016/j.biomaterials.2018.11.024] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 11/06/2018] [Accepted: 11/13/2018] [Indexed: 11/18/2022]
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186
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Natividad-Diaz SL, Browne S, Jha AK, Ma Z, Hossainy S, Kurokawa YK, George SC, Healy KE. A combined hiPSC-derived endothelial cell and in vitro microfluidic platform for assessing biomaterial-based angiogenesis. Biomaterials 2018; 194:73-83. [PMID: 30583150 DOI: 10.1016/j.biomaterials.2018.11.032] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 11/26/2018] [Indexed: 12/12/2022]
Abstract
Human induced pluripotent stem cell (hiPSC) derived angiogenesis models present a unique opportunity for patient-specific platforms to study the complex process of angiogenesis and the endothelial cell response to biomaterial and biophysical changes in a defined microenvironment. We present a refined method for differentiating hiPSCs into a CD31 + endothelial cell population (hiPSC-ECs) using a single basal medium from pluripotency to the final stage of differentiation. This protocol produces endothelial cells that are functionally competent in assays following purification. Subsequently, an in vitro angiogenesis model was developed by encapsulating the hiPSC-ECs into a tunable, growth factor sequestering hyaluronic acid (HyA) matrix where they formed stable, capillary-like networks that responded to environmental stimuli. Perfusion of the networks was demonstrated using fluorescent beads in a microfluidic device designed to study angiogenesis. The combination of hiPSC-ECs, bioinspired hydrogel, and the microfluidic platform creates a unique testbed for rapidly assessing the performance of angiogenic biomaterials.
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Affiliation(s)
- Sylvia L Natividad-Diaz
- Department of Bioengineering, University of California-Berkeley, Berkeley, CA, United States
| | - Shane Browne
- Department of Bioengineering, University of California-Berkeley, Berkeley, CA, United States
| | - Amit K Jha
- Department of Bioengineering, University of California-Berkeley, Berkeley, CA, United States; Department of Materials Science and Engineering, University of California-Berkeley, Berkeley, CA, United States
| | - Zhen Ma
- Department of Bioengineering, University of California-Berkeley, Berkeley, CA, United States
| | - Samir Hossainy
- Department of Bioengineering, University of California-Berkeley, Berkeley, CA, United States; Department of Materials Science and Engineering, University of California-Berkeley, Berkeley, CA, United States
| | - Yosuke K Kurokawa
- Department of Biomedical Engineering, Washington University in St Louis, MO, United States
| | - Steven C George
- Department of Biomedical Engineering, University of California-Davis, Davis, CA, United States
| | - Kevin E Healy
- Department of Bioengineering, University of California-Berkeley, Berkeley, CA, United States; Department of Materials Science and Engineering, University of California-Berkeley, Berkeley, CA, United States.
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187
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Sanchez-Rojas L, Gómez-Pinedo U, Benito-Martin MS, León-Espinosa G, Rascón-Ramirez F, Lendinez C, Martínez-Ramos C, Matías-Guiu J, Pradas MM, Barcia JA. Biohybrids of scaffolding hyaluronic acid biomaterials plus adipose stem cells home local neural stem and endothelial cells: Implications for reconstruction of brain lesions after stroke. J Biomed Mater Res B Appl Biomater 2018; 107:1598-1606. [PMID: 30307108 DOI: 10.1002/jbm.b.34252] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 08/23/2018] [Accepted: 09/08/2018] [Indexed: 12/25/2022]
Abstract
Endogenous neurogenesis in stroke is insufficient to replace the lost brain tissue, largely due to the lack of a proper biological structure to let new cells dwell in the damaged area. We hypothesized that scaffolds made of hyaluronic acid (HA) biomaterials (BM) could provide a suitable environment to home not only new neurons, but also vessels, glia and neurofilaments. Further, the addition of exogenous cells, such as adipose stem cells (ASC) could increase this effect. Athymic mice were randomly assigned to a one of four group: stroke alone, stroke and implantation of BM, stroke and implantation of BM with ASC, and sham operated animals. Stroke model consisted of middle cerebral artery thrombosis with FeCl3 . After 30 days, animals underwent magnetic resonance imaging (MRI) and were sacrificed. Proliferation and neurogenesis increased at the subventricular zone ipsilateral to the ventricle and neuroblasts, glial, and endothelial cells forming capillaries were seen inside the BM. Those effects increased when ASC were added, while there was less inflammatory reaction. Three-dimensional scaffolds made of HA are able to home newly formed neurons, glia, and endothelial cells permitting the growth neurofilaments inside them. The addition of ASC increase these effects and decrease the inflammatory reaction to the implant. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 1598-1606, 2019.
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Affiliation(s)
- Leyre Sanchez-Rojas
- Laboratorio de Medicina Regenerativa, Instituto de Neurociencias, Instituto de Investigación Sanitaria San Carlos (IdISSC), Hospital Clínico San Carlos, Madrid, Spain
| | - Ulises Gómez-Pinedo
- Laboratorio de Medicina Regenerativa, Instituto de Neurociencias, Instituto de Investigación Sanitaria San Carlos (IdISSC), Hospital Clínico San Carlos, Madrid, Spain
| | - María Soledad Benito-Martin
- Laboratorio de Medicina Regenerativa, Instituto de Neurociencias, Instituto de Investigación Sanitaria San Carlos (IdISSC), Hospital Clínico San Carlos, Madrid, Spain
| | - Gonzalo León-Espinosa
- Laboratorio de Medicina Regenerativa, Instituto de Neurociencias, Instituto de Investigación Sanitaria San Carlos (IdISSC), Hospital Clínico San Carlos, Madrid, Spain.,Instituto Cajal, CSIC; Laboratorio Cajal de Circuitos Corticales (CTB), Universidad Politécnica de Madrid; Facultad de Farmacia, Universidad San Pablo CEU, Madrid, Spain
| | - Fernando Rascón-Ramirez
- Servicio de Neurocirugía, Instituto de Investigación Sanitaria San Carlos (IdISSC), Hospital Clínico San Carlos, Universidad Complutense de Madrid, Madrid, Spain
| | - Cristina Lendinez
- Laboratorio de Medicina Regenerativa, Instituto de Neurociencias, Instituto de Investigación Sanitaria San Carlos (IdISSC), Hospital Clínico San Carlos, Madrid, Spain
| | - Cristina Martínez-Ramos
- Center for Biomaterials and Tissue Engineering, Universitat Politécnica de Valencia, C. de Vera s/n, Valencia, Spain
| | - Jorge Matías-Guiu
- Servicio de Neurología. Instituto de Investigación Sanitaria San Carlos (IdISSC), Hospital Clínico San Carlos, Universidad Complutense de Madrid, Madrid, Spain
| | - Manuel Monleón Pradas
- Center for Biomaterials and Tissue Engineering, Universitat Politécnica de Valencia, C. de Vera s/n, Valencia, Spain.,Networking Research Center on Bioengineering, Biomaterials and Nanomedicine, Valencia, Spain
| | - Juan A Barcia
- Servicio de Neurocirugía, Instituto de Investigación Sanitaria San Carlos (IdISSC), Hospital Clínico San Carlos, Universidad Complutense de Madrid, Madrid, Spain
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188
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Patel R, Muir M, Cvetkovic C, Krencik R. Concepts toward directing human astroplasticity to promote neuroregeneration. Dev Dyn 2018; 248:21-33. [DOI: 10.1002/dvdy.24655] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 06/19/2018] [Accepted: 06/19/2018] [Indexed: 12/20/2022] Open
Affiliation(s)
| | | | - Caroline Cvetkovic
- Center for Neuroregeneration, Department of Neurosurgery; Houston Methodist Research Institute; Houston Texas
| | - Robert Krencik
- Center for Neuroregeneration, Department of Neurosurgery; Houston Methodist Research Institute; Houston Texas
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189
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Spinal cord organogenesis model reveals role of Flk1 + cells in self-organization of neural progenitor cells into complex spinal cord tissue. Stem Cell Res 2018; 33:156-165. [PMID: 30368192 DOI: 10.1016/j.scr.2018.09.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 08/02/2018] [Accepted: 09/05/2018] [Indexed: 12/15/2022] Open
Abstract
A platform for studying spinal cord organogenesis in vivo where embryonic stem cell (ESC)-derived neural progenitor cells (NPC) self-organize into spinal cord-like tissue after transplantation in subarachnoid space of the spinal cord has been described. We advance the applicability of this platform by imaging in vivo the formed graft through T2w magnetic resonance imaging (MRI). Furthermore, we used diffusion tensor imaging (DTI) to verify the stereotypical organization of the graft showing that it mimics the host spinal cord. Within the graft white matter (WM) we identified astrocytes that form glial limitans, myelinating oligodendrocytes, and myelinated axons with paranodes. Within the graft grey matter (GM) we identified cholinergic, glutamatergic, serotonergic and dopaminergic neurons. Furthermore, we demonstrate the presence of ESC-derived complex vasculature that includes the presence of blood brain barrier. In addition to the formation of mature spinal cord tissue, we describe factors that drive this process. Specifically, we identify Flk1+ cells as necessary for spinal cord formation, and synaptic connectivity with the host spinal cord and formation of host-graft chimeric vasculature as contributing factors. This model can be used to study spinal cord organogenesis, and as an in vivo drug discovery platform for screening potential therapeutic compounds and their toxicity.
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190
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Fernández-García L, Pérez-Rigueiro J, Martinez-Murillo R, Panetsos F, Ramos M, Guinea GV, González-Nieto D. Cortical Reshaping and Functional Recovery Induced by Silk Fibroin Hydrogels-Encapsulated Stem Cells Implanted in Stroke Animals. Front Cell Neurosci 2018; 12:296. [PMID: 30237762 PMCID: PMC6135908 DOI: 10.3389/fncel.2018.00296] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Accepted: 08/16/2018] [Indexed: 01/07/2023] Open
Abstract
The restitution of damaged circuitry and functional remodeling of peri-injured areas constitute two main mechanisms for sustaining recovery of the brain after stroke. In this study, a silk fibroin-based biomaterial efficiently supports the survival of intracerebrally implanted mesenchymal stem cells (mSCs) and increases functional outcomes over time in a model of cortical stroke that affects the forepaw sensory and motor representations. We show that the functional mechanisms underlying recovery are related to a substantial preservation of cortical tissue in the first days after mSCs-polymer implantation, followed by delayed cortical plasticity that involved a progressive functional disconnection between the forepaw sensory (FLs1) and caudal motor (cFLm1) representations and an emergent sensory activity in peri-lesional areas belonging to cFLm1. Our results provide evidence that mSCs integrated into silk fibroin hydrogels attenuate the cerebral damage after brain infarction inducing a delayed cortical plasticity in the peri-lesional tissue, this later a functional change described during spontaneous or training rehabilitation-induced recovery. This study shows that brain remapping and sustained recovery were experimentally favored using a stem cell-biomaterial-based approach.
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Affiliation(s)
| | - José Pérez-Rigueiro
- Center for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain,Departamento de Ciencia de Materiales, Escuela Técnica Superior de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid, Madrid, Spain,Biomedical Research Networking Center in Bioengineering Biomaterials and Nanomedicine, Madrid, Spain
| | - Ricardo Martinez-Murillo
- Department of Translational Neuroscience, Instituto Cajal – Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Fivos Panetsos
- Neurocomputing and Neurorobotics Research Group, Faculty of Biology and Faculty of Optics, Universidad Complutense de Madrid, Madrid, Spain,Neural Plasticity Research Group, Health Research Institute of the Hospital Clínico San Carlos, Madrid, Spain
| | - Milagros Ramos
- Center for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain,Biomedical Research Networking Center in Bioengineering Biomaterials and Nanomedicine, Madrid, Spain,Departamento de Tecnología Fotónica y Bioingeniería, Escuela Técnica Superior de Ingenieros de Telecomunicación, Universidad Politécnica de Madrid, Madrid, Spain
| | - Gustavo V. Guinea
- Center for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain,Departamento de Ciencia de Materiales, Escuela Técnica Superior de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid, Madrid, Spain,Biomedical Research Networking Center in Bioengineering Biomaterials and Nanomedicine, Madrid, Spain
| | - Daniel González-Nieto
- Center for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain,Biomedical Research Networking Center in Bioengineering Biomaterials and Nanomedicine, Madrid, Spain,Departamento de Tecnología Fotónica y Bioingeniería, Escuela Técnica Superior de Ingenieros de Telecomunicación, Universidad Politécnica de Madrid, Madrid, Spain,*Correspondence: Daniel González-Nieto,
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191
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Rajkovic O, Potjewyd G, Pinteaux E. Regenerative Medicine Therapies for Targeting Neuroinflammation After Stroke. Front Neurol 2018; 9:734. [PMID: 30233484 PMCID: PMC6129611 DOI: 10.3389/fneur.2018.00734] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 08/13/2018] [Indexed: 12/15/2022] Open
Abstract
Inflammation is a major pathological event following ischemic stroke that contributes to secondary brain tissue damage leading to poor functional recovery. Following the initial ischemic insult, post-stroke inflammatory damage is driven by initiation of a central and peripheral innate immune response and disruption of the blood-brain barrier (BBB), both of which are triggered by the release of pro-inflammatory cytokines and infiltration of circulating immune cells. Stroke therapies are limited to early cerebral blood flow reperfusion, and whilst current strategies aim at targeting neurodegeneration and/or neuroinflammation, innovative research in the field of regenerative medicine aims at developing effective treatments that target both the acute and chronic phase of inflammation. Anti-inflammatory regenerative strategies include the use of nanoparticles and hydrogels, proposed as therapeutic agents and as a delivery vehicle for encapsulated therapeutic biological factors, anti-inflammatory drugs, stem cells, and gene therapies. Biomaterial strategies-through nanoparticles and hydrogels-enable the administration of treatments that can more effectively cross the BBB when injected systemically, can be injected directly into the brain, and can be 3D-bioprinted to create bespoke implants within the site of ischemic injury. In this review, these emerging regenerative and anti-inflammatory approaches will be discussed in relation to ischemic stroke, with a perspective on the future of stroke therapies.
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Affiliation(s)
- Olivera Rajkovic
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom
| | - Geoffrey Potjewyd
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom
| | - Emmanuel Pinteaux
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom
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192
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Affiliation(s)
- Anup Tuladhar
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
| | - Molly S Shoichet
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada.
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, Canada.
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193
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Li W, Yan Z, Ren J, Qu X. Manipulating cell fate: dynamic control of cell behaviors on functional platforms. Chem Soc Rev 2018; 47:8639-8684. [DOI: 10.1039/c8cs00053k] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We review the recent advances and new horizons in the dynamic control of cell behaviors on functional platforms and their applications.
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Affiliation(s)
- Wen Li
- Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Science
- Changchun
- P. R. China
| | - Zhengqing Yan
- Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Science
- Changchun
- P. R. China
| | - Jinsong Ren
- Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Science
- Changchun
- P. R. China
| | - Xiaogang Qu
- Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Science
- Changchun
- P. R. China
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