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Kedeshian K, Hong M, Hoffman L, Kita A. N-acetylcysteine microparticles reduce cisplatin-induced RSC96 Schwann cell toxicity. Laryngoscope Investig Otolaryngol 2024; 9:e1256. [PMID: 38765675 PMCID: PMC11099882 DOI: 10.1002/lio2.1256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 12/03/2023] [Accepted: 04/16/2024] [Indexed: 05/22/2024] Open
Abstract
Objectives Cisplatin is known to cause inner ear dysfunction. There is growing evidence that cisplatin-induced demyelination of spiral or Scarpa's ganglion neurons may play an additional role in drug-induced ototoxicity alongside afferent neuron injury. As Schwann cells produce myelin, there may be an opportunity to reduce ototoxic inner ear damage by promoting Schwann cell viability. This work describes a cellular model of cisplatin-induced Schwann cell injury and investigates the ability of the antioxidant N-acetylcysteine to promote Schwann cell viability. A local delivery system of drug-eluting microparticles was then fabricated, characterized, and investigated for bioactivity. Methods RSC96 rat Schwann cells were dosed with varying concentrations of cisplatin to obtain a dose curve and identify the lethal concentration of 50% of the cells (LC50). In subsequent experiments, RSC96 cells were co-treated with cisplatin and both resuspended or eluted N-acetylcysteine. Cell viability was assessed with the CCK8 assay. Results The LC50 dose of cisplatin was determined to be 3.76 μM (p = 2.2 x 10-16). When co-dosed with cisplatin and a therapeutic concentration of resuspended or eluted N-acetylcysteine, Schwann cells had an increased viability compared to cells dosed with cisplatin alone. Conclusion RSC96 Schwann cell injury following cisplatin insult is characterized in this in vitro model. Cisplatin caused injury at physiologic concentrations and N-acetylcysteine improved cell viability and mitigated this injury. N-acetylcysteine was packaged into microparticles and eluted N-acetylcysteine retained its ability to increase cell viability, thus demonstrating promise as a therapeutic to offset cisplatin-induced ototoxicity. Level of Evidence N/A Laryngoscope, 2023.
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Affiliation(s)
- Katherine Kedeshian
- Department of Head and Neck SurgeryDavid Geffen School of Medicine at University of California Los AngelesLos AngelesCaliforniaUSA
| | - Michelle Hong
- Department of Head and Neck SurgeryDavid Geffen School of Medicine at University of California Los AngelesLos AngelesCaliforniaUSA
| | - Larry Hoffman
- Department of Head and Neck SurgeryDavid Geffen School of Medicine at University of California Los AngelesLos AngelesCaliforniaUSA
- Vestibular Neuroscience Laboratory, Brain Research InstituteDavid Geffen School of Medicine at University of California Los AngelesLos AngelesCaliforniaUSA
| | - Ashley Kita
- Department of Head and Neck SurgeryDavid Geffen School of Medicine at University of California Los AngelesLos AngelesCaliforniaUSA
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Kedeshian K, Hong M, Hoffman L, Kita A. N-acetylcysteine Microparticles Reduce Cisplatin-induced RSC96 Schwann Cell Toxicity. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.31.564430. [PMID: 37961184 PMCID: PMC10635004 DOI: 10.1101/2023.10.31.564430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Objectives Cisplatin is known to cause inner ear dysfunction. There is growing evidence that cisplatin-induced demyelination of spiral or Scarpa's ganglion neurons may play an additional role in drug-induced ototoxicity alongside afferent neuron injury. As Schwann cells produce myelin, there may be an opportunity to reduce ototoxic inner ear damage by promoting Schwann cell viability. This work describes a cellular model of cisplatin-induced Schwann cell injury and investigates the ability of the antioxidant N-acetylcysteine to promote Schwann cell viability. A local delivery system of drug-eluting microparticles was then fabricated, characterized, and investigated for bioactivity. Methods RSC96 rat Schwann cells were dosed with varying concentrations of cisplatin to obtain a dose curve and identify the lethal concentration of 50% of the cells (LC 50 ). In subsequent experiments, RSC96 cells were co-treated with cisplatin and both resuspended or eluted N-acetylcysteine. Cell viability was assessed with the CCK8 assay. Results The LC 50 dose of cisplatin was determined to be 3.76 μM (p=2.2 × 10 -16 ). When co-dosed with cisplatin and therapeutic concentration of resuspended or eluted N-acetylcysteine, Schwann cells had an increased viability compared to cells dosed with cisplatin alone. Conclusion RSC96 Schwann cell injury following cisplatin insult is characterized in this in vitro model. Cisplatin caused injury at physiologic concentrations and N-acetylcysteine improved cell viability and mitigated this injury. N-acetylcysteine was packaged into microparticles and eluted N-acetylcysteine retained its ability to increase cell viability, thus demonstrating promise as a therapeutic to offset cisplatin-induced ototoxicity. Lay Summary Cisplatin is a chemotherapeutic agent known to cause balance and hearing problems through damage to the inner ear. This project explored cisplatin injury in a Schwann cell culture model and packaged an antioxidant into microparticles suitable for future drug delivery applications.
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El-Said H, Price K, Hussein A, Ganta S, Rao A, Nigro J, Brigger MT. Bronchial Remodeling Following Airway Stenting in Pediatric Patients With Tracheobronchial and Congenital Heart Disease. JOURNAL OF THE SOCIETY FOR CARDIOVASCULAR ANGIOGRAPHY & INTERVENTIONS 2023; 2:101068. [PMID: 39132388 PMCID: PMC11307877 DOI: 10.1016/j.jscai.2023.101068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 06/11/2023] [Accepted: 06/22/2023] [Indexed: 08/13/2024]
Abstract
Background Treatment of tracheobronchial disease in medically complex infants with congenital heart disease (CHD) is often challenging. When conservative management or surgery fails or is contraindicated, airway stenting can allow for advancement of care or weaning of respiratory support. Methods We identified 8 cases of airway stenting with balloon-expandable coronary bare-metal stents performed at our institution between February 2019 and September 2022 to relieve conservative treatment-refractory tracheobronchial disease in pediatric patients with CHD. All patients underwent rigid microlaryngoscopy, bronchoscopy, and flexible bronchoscopy as well as computed tomography angiography. Results Eight patients underwent technically uncomplicated placement of balloon-expandable coronary bare-metal stents in the trachea or bronchus. Immediate improvement in respiratory parameters was noted following stent placement. Six patients were able to wean mechanical ventilation following stent placement, with a median of 2.5 days of mechanical ventilation following the procedure (range, 0-219). All stents were subsequently endoscopically removed at a median of 6.8 months (range, 0.4-16.3 months). In 6 patients, bronchoscopy after stent removal demonstrated a rounder configuration of the airway consistent with bronchial remodeling. Conclusions In pediatric patients with tracheobronchial and CHD, airway stenting with balloon-expandable bare-metal coronary stents relieved respiratory symptoms with minimal complications and resulted in bronchial remodeling after stent removal.
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Affiliation(s)
- Howaida El-Said
- Pediatric Cardiology, Rady Children’s Hospital, San Diego, California
| | - Katherine Price
- University of California San Diego School of Medicine, San Diego, California
| | - Amira Hussein
- Pediatric Cardiology, Rady Children’s Hospital, San Diego, California
| | - Srujan Ganta
- Cardiothoracic Surgery, Rady Children’s Hospital, San Diego, California
| | - Aparna Rao
- Pediatric Pulmonology, Rady Children’s Hospital, San Diego, California
| | - John Nigro
- Cardiothoracic Surgery, Rady Children’s Hospital, San Diego, California
| | - Matthew T. Brigger
- Pediatric Otolaryngology, Rady Children’s Hospital, San Diego, California
- Department of Otolaryngology-Head and Neck Surgery, University of California San Diego, San Diego, California
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Mao Y, Zhang Y, Wang Y, Zhou T, Ma B, Zhou P. A multifunctional nanocomposite hydrogel with controllable release behavior enhances bone regeneration. Regen Biomater 2023; 10:rbad046. [PMID: 37287896 PMCID: PMC10243836 DOI: 10.1093/rb/rbad046] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 04/26/2023] [Indexed: 06/09/2023] Open
Abstract
Autologous and allogeneic bone grafts remain the gold standard for repairing bone defects. However, donor shortages and postoperative infections contribute to unsatisfactory treatment outcomes. Tissue engineering technology that utilizes biologically active composites to accelerate the healing and reconstruction of segmental bone defects has led to new ideas for in situ bone repair. Multifunctional nanocomposite hydrogels were constructed by covalently binding silver (Ag+) core-embedded mesoporous silica nanoparticles (Ag@MSN) to bone morphogenetic protein-2 (BMP-2), which was encapsulated into silk fibroin methacryloyl (SilMA) and photo-crosslinked to form an Ag@MSN-BMP-2/SilMA hydrogel to preserve the biological activity of BMP-2 and slow its release. More importantly, multifunctional Ag+-containing nanocomposite hydrogels showed antibacterial properties. These hydrogels possessed synergistic osteogenic and antibacterial effects to promote bone defect repair. Ag@MSN-BMP-2/SilMA exhibited good biocompatibility in vitro and in vivo owing to its interconnected porosity and improved hydrophilicity. Furthermore, the multifunctional nanocomposite hydrogel showed controllable sustained-release activity that promoted bone regeneration in repairing rat skull defects by inducing osteogenic differentiation and neovascularization. Overall, Ag@MSN-BMP-2/SilMA hydrogels enrich bone regeneration strategies and show great potential for bone regeneration.
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Affiliation(s)
- Yingji Mao
- Department of Orthopedics and Department of Plastic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
- Anhui Province Key Laboratory of Tissue Transplantation, School of Life Sciences, Bengbu Medical College, Bengbu, Anhui 233030, China
| | - Yiwen Zhang
- Department of Orthopedics and Department of Plastic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
- Department of Plastic Surgery and Burn Center, Second Affiliated Hospital, Plastic Surgery Institute of Shantou University Medical College, Shantou, Guangdong 515063, China
| | - Ying Wang
- Department of Orthopedics and Department of Plastic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
| | - Tao Zhou
- Department of Orthopedics and Department of Plastic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
| | - Bingxu Ma
- Department of Orthopedics and Department of Plastic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
| | - Pinghui Zhou
- Department of Orthopedics and Department of Plastic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
- Anhui Province Key Laboratory of Tissue Transplantation, School of Life Sciences, Bengbu Medical College, Bengbu, Anhui 233030, China
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Klabukov I, Tenchurin T, Shepelev A, Baranovskii D, Mamagulashvili V, Dyuzheva T, Krasilnikova O, Balyasin M, Lyundup A, Krasheninnikov M, Sulina Y, Gomzyak V, Krasheninnikov S, Buzin A, Zayratyants G, Yakimova A, Demchenko A, Ivanov S, Shegay P, Kaprin A, Chvalun S. Biomechanical Behaviors and Degradation Properties of Multilayered Polymer Scaffolds: The Phase Space Method for Bile Duct Design and Bioengineering. Biomedicines 2023; 11:biomedicines11030745. [PMID: 36979723 PMCID: PMC10044742 DOI: 10.3390/biomedicines11030745] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/21/2023] [Accepted: 02/22/2023] [Indexed: 03/06/2023] Open
Abstract
This article reports the electrospinning technique for the manufacturing of multilayered scaffolds for bile duct tissue engineering based on an inner layer of polycaprolactone (PCL) and an outer layer either of a copolymer of D,L-lactide and glycolide (PLGA) or a copolymer of L-lactide and ε-caprolactone (PLCL). A study of the degradation properties of separate polymers showed that flat PCL samples exhibited the highest resistance to hydrolysis in comparison with PLGA and PLCL. Irrespective of the liquid-phase nature, no significant mass loss of PCL samples was found in 140 days of incubation. The PLCL- and PLGA-based flat samples were more prone to hydrolysis within the same period of time, which was confirmed by the increased loss of mass and a significant reduction of weight-average molecular mass. The study of the mechanical properties of developed multi-layered tubular scaffolds revealed that their strength in the longitudinal and transverse directions was comparable with the values measured for a decellularized bile duct. The strength of three-layered scaffolds declined significantly because of the active degradation of the outer layer made of PLGA. The strength of scaffolds with the PLCL outer layer deteriorated much less with time, both in the axial (p-value = 0.0016) and radial (p-value = 0.0022) directions. A novel method for assessment of the physiological relevance of synthetic scaffolds was developed and named the phase space approach for assessment of physiological relevance. Two-dimensional phase space (elongation modulus and tensile strength) was used for the assessment and visualization of the physiological relevance of scaffolds for bile duct bioengineering. In conclusion, the design of scaffolds for the creation of physiologically relevant tissue-engineered bile ducts should be based not only on biodegradation properties but also on the biomechanical time-related behavior of various compositions of polymers and copolymers.
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Affiliation(s)
- Ilya Klabukov
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
- Department of Urology and Operative Nephrology, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
- Obninsk Institute for Nuclear Power Engineering, National Research Nuclear University MEPhI, 115409 Obninsk, Russia
- Correspondence:
| | - Timur Tenchurin
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Alexey Shepelev
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Denis Baranovskii
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
- Department of Urology and Operative Nephrology, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
| | - Vissarion Mamagulashvili
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Tatiana Dyuzheva
- Department of Hospital Surgery, Sklifosovsky Institute of Clinical Medicine, Sechenov First Moscow State Medical University (Sechenov University), 119435 Moscow, Russia
| | - Olga Krasilnikova
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
| | - Maksim Balyasin
- Research and Educational Resource Center for Cellular Technologies, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
| | - Alexey Lyundup
- Research and Educational Resource Center for Cellular Technologies, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
- N.P. Bochkov Research Centre for Medical Genetics, 115478 Moscow, Russia
| | - Mikhail Krasheninnikov
- Research and Educational Resource Center for Cellular Technologies, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
- Lomonosov Institute of Fine Chemical Technologies, Russian Technological University MIREA, 119454 Moscow, Russia
| | - Yana Sulina
- Department of Obstetrics and Gynecology, Sechenov First Moscow State Medical University (Sechenov University), 119435 Moscow, Russia
| | - Vitaly Gomzyak
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Sergey Krasheninnikov
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Alexander Buzin
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
- Laboratory of the Structure of Polymer Materials, Enikolopov Institute of Synthetic Polymer Materials RAS, 117393 Moscow, Russia
| | - Georgiy Zayratyants
- Department of Pathology, Moscow State University of Medicine and Dentistry, Delegatskaya st., 20, p. 1, 127473 Moscow, Russia
| | - Anna Yakimova
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
| | - Anna Demchenko
- N.P. Bochkov Research Centre for Medical Genetics, 115478 Moscow, Russia
| | - Sergey Ivanov
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
| | - Peter Shegay
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
- Department of Urology and Operative Nephrology, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
| | - Andrey Kaprin
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
- Department of Urology and Operative Nephrology, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
| | - Sergei Chvalun
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
- Laboratory of the Structure of Polymer Materials, Enikolopov Institute of Synthetic Polymer Materials RAS, 117393 Moscow, Russia
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Evaluation of Topology Optimization Using 3D Printing for Bioresorbable Fusion Cages: A Biomechanical Study in a Porcine Model. Spine (Phila Pa 1976) 2023; 48:E46-E53. [PMID: 36130044 PMCID: PMC9855756 DOI: 10.1097/brs.0000000000004491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 08/31/2022] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Preclinical biomechanical study of topology optimization versus standard ring design for bioresorbable poly-ε-caprolactone (PCL) cervical spine fusion cages delivering bone morphogenetic protein-2 (BMP-2) using a porcine model. OBJECTIVE The aim was to evaluate range of motion (ROM) and bone fusion, as a function of topology optimization and BMP-2 delivery method. SUMMARY OF BACKGROUND DATA 3D printing technology enables fabrication of topology-optimized cages using bioresorbable materials, offering several advantages including customization, and lower stiffness. Delivery of BMP-2 using topology optimization may enhance the quality of fusion. METHODS Twenty-two 6-month-old pigs underwent anterior cervical discectomy fusion at one level using 3D printed PCL cages. Experimental groups (N=6 each) included: Group 1: ring design with surface adsorbed BMP-2, Group 2: topology-optimized rectangular design with surface adsorbed BMP-2, and Group 3: ring design with BMP-2 delivery via collagen sponge. Additional specimens, two of each design, were implanted without BMP-2, as controls. Complete cervical segments were harvested six months postoperatively. Nanocomputed tomography was performed to assess complete bony bridging. Pure moment biomechanical testing was conducted in all three planes, separately. Continuous 3D motions were recorded and analyzed. RESULTS Three subjects suffered early surgical complications and were not evaluated. Overall, ROM for experimental specimens, regardless of design or BMP-2 delivery method, was comparable, with no clinically significant differences among groups. Among experimental specimens at the level of the fusion, ROM was <1.0° in flexion and extension, indicative of fusion, based on clinically applied criteria for fusion of <2 to 4°. Despite the measured biomechanical stability, using computed tomography evaluation, complete bony bridging was observed in 40% of the specimens in Group 1, 50% of Group 2, 100% of Group 3, and none of the control specimens. CONCLUSION A topology-optimized PCL cage with BMP-2 is capable of resulting in an intervertebral fusion, similar to a conventional ring-based design of the same bioresorbable material.
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Toh EMS, Thenpandiyan AA, Foo ASC, Zhang JJY, Lim MJR, Goh CP, Dinesh N, Vedicherla SV, Yang M, Teo K, Yeo TT, Nga VDW. Clinical Outcomes of 3D-Printed Bioresorbable Scaffolds for Bone Tissue Engineering-A Pilot Study on 126 Patients for Burrhole Covers in Subdural Hematoma. Biomedicines 2022; 10:0. [PMID: 36359222 PMCID: PMC9687313 DOI: 10.3390/biomedicines10112702] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/17/2022] [Accepted: 10/20/2022] [Indexed: 10/29/2023] Open
Abstract
Burrhole craniostomy is commonly performed for subdural hematoma (SDH) evacuation, but residual scalp depressions are often cosmetically suboptimal for patients. OsteoplugTM, a bioresorbable polycaprolactone burrhole cover, was introduced by the National University Hospital, Singapore, in 2006 to cover these defects, allowing osseous integration and vascular ingrowth. However, the cosmetic and safety outcomes of OsteoplugTM-C-the latest (2017) iteration, with a chamfered hole for subdural drains-remain unexplored. Data were collected from a single institution from April 2017 to March 2021. Patient-reported aesthetic outcomes (Aesthetic Numeric Analog (ANA)) and quality of life (EQ-5D-3L including Visual Analog Scale (VAS)) were assessed via telephone interviews. Clinical outcomes included SDH recurrence, postoperative infections, and drain complications. OsteoplugTM-C patients had significantly higher satisfaction and quality of life compared to those without a burrhole cover (ANA: 9 [7, 9] vs. 7 [5, 8], p = 0.019; VAS: 85 [75, 90] vs. 70 [50, 80], p = 0.021), and the absence of a burrhole cover was associated with poorer aesthetic outcomes after multivariable adjustment (adjusted OR: 4.55, 95% CI: 1.09-22.68, p = 0.047). No significant differences in other clinical outcomes were observed between OsteoplugTM-C, OsteoplugTM, or no burrhole cover. Our pilot study supports OsteoplugTM-C and its material polycaprolactone as suitable adjuncts to burrhole craniostomy, improving cosmetic outcomes while achieving comparable safety outcomes.
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Affiliation(s)
- Emma M. S. Toh
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore; (E.M.S.T.); (A.A.T.)
| | - Ashiley A. Thenpandiyan
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore; (E.M.S.T.); (A.A.T.)
| | - Aaron S. C. Foo
- Division of Neurosurgery, Department of Surgery, National University Hospital, Singapore 119228, Singapore; (A.S.C.F.); (J.J.Y.Z.); (M.J.R.L.); (C.P.G.); (N.D.); (S.V.V.); (K.T.); (T.T.Y.)
| | - John J. Y. Zhang
- Division of Neurosurgery, Department of Surgery, National University Hospital, Singapore 119228, Singapore; (A.S.C.F.); (J.J.Y.Z.); (M.J.R.L.); (C.P.G.); (N.D.); (S.V.V.); (K.T.); (T.T.Y.)
| | - Mervyn J. R. Lim
- Division of Neurosurgery, Department of Surgery, National University Hospital, Singapore 119228, Singapore; (A.S.C.F.); (J.J.Y.Z.); (M.J.R.L.); (C.P.G.); (N.D.); (S.V.V.); (K.T.); (T.T.Y.)
| | - Chun Peng Goh
- Division of Neurosurgery, Department of Surgery, National University Hospital, Singapore 119228, Singapore; (A.S.C.F.); (J.J.Y.Z.); (M.J.R.L.); (C.P.G.); (N.D.); (S.V.V.); (K.T.); (T.T.Y.)
| | - Nivedh Dinesh
- Division of Neurosurgery, Department of Surgery, National University Hospital, Singapore 119228, Singapore; (A.S.C.F.); (J.J.Y.Z.); (M.J.R.L.); (C.P.G.); (N.D.); (S.V.V.); (K.T.); (T.T.Y.)
| | - Srujana V. Vedicherla
- Division of Neurosurgery, Department of Surgery, National University Hospital, Singapore 119228, Singapore; (A.S.C.F.); (J.J.Y.Z.); (M.J.R.L.); (C.P.G.); (N.D.); (S.V.V.); (K.T.); (T.T.Y.)
| | - Ming Yang
- Division of Neurosurgery, Department of Surgery, Khoo Teck Puat Hospital, Singapore 768828, Singapore;
| | - Kejia Teo
- Division of Neurosurgery, Department of Surgery, National University Hospital, Singapore 119228, Singapore; (A.S.C.F.); (J.J.Y.Z.); (M.J.R.L.); (C.P.G.); (N.D.); (S.V.V.); (K.T.); (T.T.Y.)
| | - Tseng Tsai Yeo
- Division of Neurosurgery, Department of Surgery, National University Hospital, Singapore 119228, Singapore; (A.S.C.F.); (J.J.Y.Z.); (M.J.R.L.); (C.P.G.); (N.D.); (S.V.V.); (K.T.); (T.T.Y.)
| | - Vincent D. W. Nga
- Division of Neurosurgery, Department of Surgery, National University Hospital, Singapore 119228, Singapore; (A.S.C.F.); (J.J.Y.Z.); (M.J.R.L.); (C.P.G.); (N.D.); (S.V.V.); (K.T.); (T.T.Y.)
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Dirauf M, Muljajew I, Weber C, Schubert US. Recent advances in degradable synthetic polymers for biomedical applications – Beyond polyesters. Prog Polym Sci 2022. [DOI: 10.1016/j.progpolymsci.2022.101547] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Michaels R, Ramaraju H, Crotts SJ, Hollister SJ, Zopf DA. Early preclinical evaluation of a novel, computer aided designed, 3D printed, bioresorbable posterior cricoid scaffold. Int J Pediatr Otorhinolaryngol 2021; 150:110892. [PMID: 34507091 DOI: 10.1016/j.ijporl.2021.110892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 07/22/2021] [Accepted: 08/19/2021] [Indexed: 12/27/2022]
Abstract
OBJECTIVES The posterior cricoid split with rib graft is a procedure that elegantly corrects pediatric posterior glottic stenosis and subglottic stenosis. Currently, the procedure requires harvesting of rib cartilage which leaves room for optimization. With use of three dimensional printing technology, our objective was to design a device that would negate the need for costal cartilage harvesting in this procedure. METHODS An optimized, novel polycaprolactone scaffold was designed using computer aided design software and three dimensional printing. A pilot proof of concept study was conducted with implantation of the device in three porcine animal subjects. Device was evaluated by post-procedural clinical course, endoscopic exams, post-mortem exam, and histological evaluation. RESULTS A series of variably sized scaffolds were created. The scaffolds showed structural integrity and successfully expanded the cricoid cartilage in the porcine model study. Post-operative endoscopy and clinical exams demonstrated no signs of implant instability or failure. Gross and histologic exams showed successful mucosalization over the scaffold and cartilage ingrowth by six weeks. CONCLUSION This porcine animal pilot study demonstrated early success of a computer-aided designed, 3D printed, bioresorbable PCL posterior graft scaffold. The scaffolds eliminate the need for costal cartilage harvesting and had excellent surgical usability. The scaffolds functioned as designed, offering proof of concept and grounds for further evaluation to expand on this small pilot study with larger animal studies and continued design refinement.
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Affiliation(s)
- Ross Michaels
- Medical School, University of Michigan, Ann Arbor, MI, USA.
| | - Harsha Ramaraju
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Sara J Crotts
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Scott J Hollister
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - David A Zopf
- Department of Otolaryngology - Head and Neck Surgery, University of Michigan, Ann Arbor, MI, USA; Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA.
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Agarwal P, Greene DG, Sherman S, Wendl K, Vega L, Park H, Shimanovich R, Reid DL. Structural characterization and developability assessment of sustained release hydrogels for rapid implementation during preclinical studies. Eur J Pharm Sci 2021; 158:105689. [PMID: 33359482 DOI: 10.1016/j.ejps.2020.105689] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 11/12/2020] [Accepted: 12/17/2020] [Indexed: 10/22/2022]
Abstract
Sustained-release formulations are important tools to convert efficacious molecules into therapeutic products. Hydrogels enable the rapid assessment of sustained-release strategies, which are important during preclinical development where drug quantities are limited and fast turnaround times are the norm. Most research in hydrogel-based drug delivery has focused around synthesizing new materials and polymers, with limited focus on structural characterization, technology developability and implementation. Two commercially available thermosensitive hydrogel systems, comprised of block copolymers of poly(lactic-co-glycolic acid)-b-poly(ethylene glycol)-b-poly(lactic-co-glycolic acid) (PLGA) and poly(lactide-co-caprolactone)-b-poly(ethyleneglycol)-b-poly(lactide-co-caprolactone) (PLCL), were evaluated during this study. The two block copolymers described in the study were successfully formulated to form hydrogels which delayed the release of lysozyme (> 20 days) in vitro. Characterization of formulation attributes of the hydrogels like Tsol-gel temperature, complex viscosity and injection force showed that these systems are amenable to rapid implementation in preclinical studies. Understanding the structure of the gel network is critical to determine the factors controlling the release of therapeutics out of these gels. The structures were characterized via the gel mesh sizes, which were estimated using two orthogonal techniques: small angle X-ray scattering (SAXS) and rheology. The mesh sizes of these hydrogels were larger than the hydrodynamic radius (size) of lysozyme (drug), indicating that release through these gels is expected to be diffusive at all time scales rather than sub-diffusive. In vitro drug release experiments confirm that diffusion is the dominating mechanism for lysozyme release; with no contribution from degradation, erosion, relaxation, swelling of the polymer network or drug-polymer interactions. PLGA hydrogel was found to have a much higher complex viscosity than PLCL hydrogel, which correlates with the slower diffusivity and release of lysozyme seen from the PLGA hydrogel as compared to PLCL hydrogel. This is due to the increased frictional drag experienced by the lysozyme molecule in the PLGA hydrogel network, as described by the hydrodynamic theory.
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Affiliation(s)
- Prashant Agarwal
- Drug Product Technologies, Process Development, Amgen, Inc., 360 Binney St, Cambridge, MA 02142, United States.
| | - Daniel G Greene
- Drug Product Technologies, Process Development, Amgen, Inc., 360 Binney St, Cambridge, MA 02142, United States
| | - Scott Sherman
- Drug Product Technologies, Process Development, Amgen, Inc., 360 Binney St, Cambridge, MA 02142, United States
| | - Kaitlyn Wendl
- Drug Product Technologies, Process Development, Amgen, Inc., 360 Binney St, Cambridge, MA 02142, United States
| | - Leonela Vega
- Final Product Technologies, Process Development, Amgen Inc., 360 Binney St, Cambridge, MA 02142, United States
| | - Hyunsoo Park
- Drug Product Technologies, Process Development, Amgen, Inc., 360 Binney St, Cambridge, MA 02142, United States
| | - Roman Shimanovich
- Drug Product Technologies, Process Development, Amgen, Inc., 360 Binney St, Cambridge, MA 02142, United States
| | - Darren L Reid
- Drug Product Technologies, Process Development, Amgen, Inc., 360 Binney St, Cambridge, MA 02142, United States
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Sridharan D, Palaniappan A, Blackstone BN, Dougherty JA, Kumar N, Seshagiri PB, Sayed N, Powell HM, Khan M. In situ differentiation of human-induced pluripotent stem cells into functional cardiomyocytes on a coaxial PCL-gelatin nanofibrous scaffold. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 118:111354. [PMID: 33254974 PMCID: PMC7708677 DOI: 10.1016/j.msec.2020.111354] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 08/03/2020] [Accepted: 08/05/2020] [Indexed: 12/20/2022]
Abstract
Human-induced pluripotent stem cells (hiPSCs) derived cardiomyocytes (hiPSC-CMs) have been explored for cardiac regeneration and repair as well as for the development of in vitro 3D cardiac tissue models. Existing protocols for cardiac differentiation of hiPSCs utilize a 2D culture system. However, the efficiency of hiPSC differentiation to cardiomyocytes in 3D culture systems has not been extensively explored. In the present study, we investigated the efficiency of cardiac differentiation of hiPSCs to functional cardiomyocytes on 3D nanofibrous scaffolds. Coaxial polycaprolactone (PCL)-gelatin fibrous scaffolds were fabricated by electrospinning and characterized using scanning electron microscopy (SEM) and fourier transform infrared (FTIR) spectroscopy. hiPSCs were cultured and differentiated into functional cardiomyocytes on the nanofibrous scaffold and compared with 2D cultures. To assess the relative efficiencies of both the systems, SEM, immunofluorescence staining and gene expression analyses were performed. Contractions of differentiated cardiomyocytes were observed in 2D cultures after 2 weeks and in 3D cultures after 4 weeks. SEM analysis showed no significant differences in the morphology of cells differentiated on 2D versus 3D cultures. However, gene expression data showed significantly increased expression of cardiac progenitor genes (ISL-1, SIRPA) in 3D cultures and cardiomyocytes markers (TNNT, MHC6) in 2D cultures. In contrast, immunofluorescence staining showed no substantial differences in the expression of NKX-2.5 and α-sarcomeric actinin. Furthermore, uniform migration and distribution of the in situ differentiated cardiomyocytes was observed in the 3D fibrous scaffold. Overall, our study demonstrates that coaxial PCL-gelatin nanofibrous scaffolds can be used as a 3D culture platform for efficient differentiation of hiPSCs to functional cardiomyocytes.
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Affiliation(s)
- Divya Sridharan
- Department of Emergency Medicine, Wexner Medical Center, The Ohio State University, Columbus, OH, USA
| | - Arunkumar Palaniappan
- Department of Emergency Medicine, Wexner Medical Center, The Ohio State University, Columbus, OH, USA; Centre for Biomaterials, Cellular and Molecular Theranostics, Vellore Institute of Technology, Vellore, India
| | - Britani N Blackstone
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA
| | - Julie A Dougherty
- Department of Emergency Medicine, Wexner Medical Center, The Ohio State University, Columbus, OH, USA; Dorothy M. Davis Heart & Lung Research Institute, Wexner Medical Center, The Ohio State University, Columbus, OH, USA
| | - Naresh Kumar
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH, USA
| | - Polani B Seshagiri
- Department of Molecular Reproduction Development and Genetics, Indian Institute of Science, C V Raman Road, Bangalore KA-560012, India
| | - Nazish Sayed
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Heather M Powell
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA; Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA; Research Department, Shriners Hospitals for Children, Cincinnati, OH, USA
| | - Mahmood Khan
- Department of Emergency Medicine, Wexner Medical Center, The Ohio State University, Columbus, OH, USA; Department of Physiology and Cell Biology, Wexner Medical Center, The Ohio State University, Columbus, OH, USA; Dorothy M. Davis Heart & Lung Research Institute, Wexner Medical Center, The Ohio State University, Columbus, OH, USA.
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12
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Stramiello JA, Mohammadzadeh A, Ryan J, Brigger MT. The role of bioresorbable intraluminal airway stents in pediatric tracheobronchial obstruction: A systematic review. Int J Pediatr Otorhinolaryngol 2020; 139:110405. [PMID: 33017664 DOI: 10.1016/j.ijporl.2020.110405] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 08/24/2020] [Accepted: 09/23/2020] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Tracheal stenosis and tracheobronchomalacia are complicated, patient-specific diseases that can be treated with intraluminal stenting. Most commonly, silicone and metal stents are utilized, however, they pose significant early and late morbidity and are further complicated by growth of the airway in the pediatric population. Given recent improvements in materials science, there is a growing body of evidence suggesting a strong role for bioresorbable intraluminal stents in treating pediatric tracheobronchial obstruction. METHODS A PubMed.gov literature search was performed on December 3, 2019 and May 15, 2020, and a 2-researcher systematic review was performed following the PRISMA criteria. The following search query was utilized: (((((((bioresorbable) OR bioabsorbable) OR resorbable) OR absorbable) OR biodegradable AND airway) OR trachea) AND stent. A pooled statistical analysis was performed on all reported pediatric patients using SPSS software. RESULTS 1369 publications were screened and 26 articles with original data were identified. Materials used included polydioxanone (PDO), poly-l-lactic acid (PLLA), polyglycolic acid/poly-l-lactide co-polymer with Proglactin 910 (Vicryl®-PDS®), polycaprolactone (PCL), magnesium alloys, and co-polymers in varying proportions. Twelve articles presented data on human subjects, 8 of which were case series and case reports on pediatric populations using polydioxanone (PDO) stents. Pooled statistical analysis demonstrated an average age of 19 months (range 0.25-144), 56.5% associated with a cardiovascular anomaly, and overall complication rate of 21.7%, with a stent fragment foreign body being the most common (8.7%), followed by significant granulation tissue (4.3%), stent migration (4.3%), and local stenosis (4.3%). Comparative analysis demonstrated short-term improvement (up to 1 month) has a statistically significant association with tracheobronchomalacia versus tracheal stenosis on chi-squared test (p = 0.001). The remaining analyses did not yield statistical significance. CONCLUSION The reported application of bioresorbable materials as intraluminal airway stents is positive. All comparative animal studies report biocompatibility and fewer morbidities compared to metal and silicone stents, however, in human studies there are concerns over the short interval of degradation and the potential for obstructive foreign bodies in poorly seated stents. Overall, there are clear, reproducible advantages to bioresorbable intraluminal stents in pediatric airway obstruction, as well as common pitfalls, that warrant further research.
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Affiliation(s)
- Joshua A Stramiello
- Division of Otolaryngology-Head & Neck Surgery, Department of Surgery, University of California San Diego, 200 W Arbor Dr. MC8895, San Diego, CA, 92103, USA
| | - Amir Mohammadzadeh
- UC San Diego School of Medicine, University of California San Diego, 9500 Gilman Dr., La Jolla, CA, 92093, USA
| | - Justin Ryan
- 3D Innovations Lab, Rady Children's Hospital, San Diego, CA, 3020 Children's Way MC5166, San Diego, CA, 92123, USA
| | - Matthew T Brigger
- Division of Otolaryngology-Head & Neck Surgery, Department of Surgery, University of California San Diego, 200 W Arbor Dr. MC8895, San Diego, CA, 92103, USA; Division of Pediatric Otolaryngology, Department of Surgery, Rady Children's Hospital, San Diego, CA, 3020 Children's Way, San Diego, CA, 92123, USA.
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13
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Sultan MT, Choi BY, Ajiteru O, Hong DK, Lee SM, Kim HJ, Ryu JS, Lee JS, Hong H, Lee YJ, Lee H, Suh YJ, Lee OJ, Kim SH, Suh SW, Park CH. Reinforced-hydrogel encapsulated hMSCs towards brain injury treatment by trans-septal approach. Biomaterials 2020; 266:120413. [PMID: 33038593 DOI: 10.1016/j.biomaterials.2020.120413] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 09/11/2020] [Accepted: 09/18/2020] [Indexed: 12/14/2022]
Abstract
Encapsulated stem cells in various biomaterials have become a potentially promising cell transplantation strategy in the treatment of various neurologic disorders. However, there is no ideal cell delivery material and method for clinical application in brain diseases. Here we show silk fibroin (SF)-based hydrogel encapsulated engineered human mesenchymal stem cells (hMSCs) to overproduce brain-derived neurotrophic factor (BDNF) (BDNF-hMSC) is an effective approach to treat brain injury through trans-septal cell transplantation in the rat model. In this study, we observed SF induced sustained BDNF production by BDNF-hMSC both in 2D (9.367 ± 1.969 ng/ml) and 3D (7.319 ± 0.1025 ng/ml) culture conditions for 3 days. Through immunohistochemistry using α-tubulin, BDNF-hMSCs showed a significant increased average neurite length of co-cultured neuro 2a (N2a) cells, suggested that BDNF-hMSCs induced neurogenesis in vitro. Encapsulated BDNF-hMSC, pre-labeled with the red fluorescent dye PKH-26, exhibited intense fluorescence up to 14 days trans-septal transplantation, indicated excellent viability of the transplanted cells. Compared to the vehicle-treated, encapsulated BDNF- hMSC demonstrated significantly increased BDNF level both in the sham-operated and injured hippocampus (Hip) through immunoblot analysis after 7 days implantation. Transplantation of the encapsulated BDNF-hMSC promoted neurological functional recovery via significantly reduced neuronal death in the Hip 7 days post-injury. Using magnetic resonance imaging (MRI) analysis, we demonstrated that encapsulated BDNF-hMSC reduced lesion area significantly at 14 and 21 days in the damaged brain following trans-septal implantation. This stem cell transplantation approach represents a critical set up towards brain injury treatment for clinical application.
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Affiliation(s)
- Md Tipu Sultan
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea
| | - Bo Young Choi
- Department of Physiology, Hallym University College of Medicine, Chuncheon, 24252, Republic of Korea
| | - Olatunji Ajiteru
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea
| | - Dae Ki Hong
- Department of Physiology, Hallym University College of Medicine, Chuncheon, 24252, Republic of Korea
| | - Soon Min Lee
- SL BiGen, Inc. SL BIGEN Research Hall, 85 Songdogwahak-ro, Yeonsu-gu, Incheon, 21983, Republic of Korea
| | - Hyo-Jin Kim
- SL BiGen, Inc. SL BIGEN Research Hall, 85 Songdogwahak-ro, Yeonsu-gu, Incheon, 21983, Republic of Korea
| | - Jun Sun Ryu
- Department of Otorhinolaryngology-Head and Neck Surgery, National Cancer Center, Goyang, 10408, Republic of Korea
| | - Ji Seung Lee
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea
| | - Heesun Hong
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea
| | - Young Jin Lee
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea
| | - Hanna Lee
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea
| | - Ye Ji Suh
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea
| | - Ok Joo Lee
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea
| | - Soon Hee Kim
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea
| | - Sang Won Suh
- Department of Physiology, Hallym University College of Medicine, Chuncheon, 24252, Republic of Korea
| | - Chan Hum Park
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon, Gangwon-do, 24252, Republic of Korea; Department of Otorhinolaryngology-Head and Neck Surgery, Chuncheon Sacred Heart Hospital, School of Medicine, Hallym University, Chuncheon, 24253, Republic of Korea.
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14
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Esteban-Garcia N, Nombela C, Garrosa J, Rascón-Ramirez FJ, Barcia JA, Sánchez-Sánchez-Rojas L. Neurorestoration Approach by Biomaterials in Ischemic Stroke. Front Neurosci 2020; 14:431. [PMID: 32477053 PMCID: PMC7235425 DOI: 10.3389/fnins.2020.00431] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 04/08/2020] [Indexed: 12/11/2022] Open
Abstract
Ischemic stroke (IS) is the leading cause of disability in the western world, assuming a high socio-economic cost. One of the most used strategies in the last decade has been biomaterials, which have been initially used with a structural support function. They have been perfected, different compounds have been combined, and they have been used together with cell therapy or controlled release chemical compounds. This double function has driven them as potential candidates for the chronic treatment of IS. In fact, the most developed are in different phases of clinical trial. In this review, we will show the ischemic scenario and address the most important criteria to achieve a successful neuroreparation from the point of view of biomaterials. The spontaneous processes that are activated and how to enhance them is one of the keys that contribute to the success of the therapeutic approach. In addition, the different routes of administration and how they affect the design of biomaterials are analyzed. Future perspectives show where this broad scientific field is heading, which advances every day with the help of technology and advanced therapies.
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Affiliation(s)
- Noelia Esteban-Garcia
- Regenerative Medicine and Advanced Therapies Lab, Instituto de Investigación Sanitaria San Carlos, Clínico San Carlos Hospital, Madrid, Spain
| | - Cristina Nombela
- Regenerative Medicine and Advanced Therapies Lab, Instituto de Investigación Sanitaria San Carlos, Clínico San Carlos Hospital, Madrid, Spain
- Department of Biological and Health Psychology, Universidad Autónoma de Madrid, Madrid, Spain
| | - Javier Garrosa
- Regenerative Medicine and Advanced Therapies Lab, Instituto de Investigación Sanitaria San Carlos, Clínico San Carlos Hospital, Madrid, Spain
| | | | - Juan Antonio Barcia
- Neurosurgery Department, Clínico San Carlos Hospital, Madrid, Spain
- Chair of Neurosurgery Department, Clínico San Carlos Hospital, Madrid, Spain
| | - Leyre Sánchez-Sánchez-Rojas
- Regenerative Medicine and Advanced Therapies Lab, Instituto de Investigación Sanitaria San Carlos, Clínico San Carlos Hospital, Madrid, Spain
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15
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Moore KM, Graham-Gurysh EG, Bomba HN, Murthy AB, Bachelder EM, Hingtgen SD, Ainslie KM. Impact of composite scaffold degradation rate on neural stem cell persistence in the glioblastoma surgical resection cavity. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 111:110846. [PMID: 32279815 DOI: 10.1016/j.msec.2020.110846] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 03/12/2020] [Indexed: 10/24/2022]
Abstract
Tumoricidal neural stem cells (NSCs) are an emerging therapy to combat glioblastoma (GBM). This therapy employs genetically engineered NSCs that secrete tumoricidal agents to seek out and kill tumor foci remaining after GBM surgical resection. Biomaterial scaffolds have previously been utilized to deliver NSCs to the resection cavity. Here, we investigated the impact of scaffold degradation rate on NSC persistence in the brain resection cavity. Composite acetalated dextran (Ace-DEX) gelatin electrospun scaffolds were fabricated with two distinct degradation profiles created by changing the ratio of cyclic to acyclic acetal coverage of Ace-DEX. In vitro, fast degrading scaffolds were fully degraded by one week, whereas slow degrading scaffolds had a half-life of >56 days. The scaffolds also retained distinct degradation profiles in vivo. Two different NSC lines readily adhered to and remained viable on Ace-DEX gelatin scaffolds, in vitro. Therapeutic NSCs secreting tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) had the same TRAIL output as tissue culture treated polystyrene (TCPS) when seeded on both scaffolds. Furthermore, secreted TRAIL was found to be highly potent against the human derived GBM cell line, GBM8, in vitro. Firefly luciferase expressing NSCs were seeded on scaffolds, implanted in a surgical resection cavity and their persistence in the brain was monitored by bioluminescent imaging (BLI). NSC loaded scaffolds were compared to a direct injection (DI) of NSCs in suspension, which is the current clinical approach to NSC therapy for GBM. Fast and slow degrading scaffolds enhanced NSC implantation efficiency 2.87 and 3.08-fold over DI, respectively. Interestingly, scaffold degradation profile did not significantly impact NSC persistence. However, persistence and long-term survival of NSCs was significantly greater for both scaffolds compared to DI, with scaffold implanted NSCs still detected by BLI at day 120 in most mice. Overall, these results highlight the benefit of utilizing a scaffold for application of tumoricidal NSC therapy for GBM.
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Affiliation(s)
- Kathryn M Moore
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, USA
| | - Elizabeth G Graham-Gurysh
- Division of Pharmacoengineering and Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, USA
| | - Hunter N Bomba
- Division of Pharmacoengineering and Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, USA
| | - Ananya B Murthy
- Division of Pharmacoengineering and Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, USA
| | - Eric M Bachelder
- Division of Pharmacoengineering and Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, USA
| | - Shawn D Hingtgen
- Division of Pharmacoengineering and Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, USA; Department of Neurosurgery, UNC School of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Kristy M Ainslie
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, USA; Division of Pharmacoengineering and Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, USA; Department of Microbiology and Immunology, UNC School of Medicine, University of North Carolina, Chapel Hill, NC, USA.
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16
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Thiolated bone and tendon tissue particles covalently bound in hydrogels for in vivo calvarial bone regeneration. Acta Biomater 2020; 104:66-75. [PMID: 31904561 DOI: 10.1016/j.actbio.2019.12.035] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 12/17/2019] [Accepted: 12/30/2019] [Indexed: 12/25/2022]
Abstract
Bone regeneration of large cranial defects, potentially including traumatic brain injury (TBI) treatment, presents a major problem with non-crosslinking, clinically available products due to material migration outside the defect. Commercial products such as bone cements are permanent and thus not conducive to bone regeneration, and typical commercial bioactive materials for bone regeneration do not crosslink. Our previous work demonstrated that non-crosslinking materials may be prone to material migration following surgical placement, and the current study attempted to address these problems by introducing a new hydrogel system where tissue particles are themselves the crosslinker. Specifically, a pentenoate-modified hyaluronic acid (PHA) polymer was covalently linked to thiolated tissue particles of demineralized bone matrix (TDBM) or devitalized tendon (TDVT), thereby forming an interconnected hydrogel matrix for calvarial bone regeneration. All hydrogel precursor solutions exhibited sufficient yield stress for surgical placement and an adequate compressive modulus post-crosslinking. Critical-size calvarial defects were filled with a 4% PHA hydrogel containing 10 or 20% TDBM or TDVT, with the clinical product DBXⓇ being employed as the standard of care control for the in vivo study. At 12 weeks, micro-computed tomography analysis demonstrated similar bone regeneration among the experimental groups, TDBM and TDVT, and the standard of care control DBXⓇ. The group with 10% TDBM was therefore identified as an attractive material for potential calvarial defect repair, as it additionally exhibited a sufficient initial recovery after shearing (i.e., > 80% recovery). Future studies will focus on applying a hydrogel in a rat model for treatment of TBI. STATEMENT OF SIGNIFICANCE: Non-crosslinking materials may be prone to material migration from a calvarial bone defect following surgical placement, which is problematic for materials intended for bone regeneration. Unfortunately, typical crosslinking materials such as bone cements are permanent and thus not conducive to bone regeneration, and typical bioactive materials for bone regeneration such as tissue matrix are not crosslinked in commercial products. The current study addressed these problems by introducing a new biomaterial where tissue particles are themselves the crosslinker in a hydrogel system. The current study successfully demonstrated a new material based on pentenoate-modified hyaluronic acid with thiolated demineralized bone matrix that is capable of rapid crosslinking, with desirable paste-like rheology of the precursor material for surgical placement, and with bone regeneration comparable to a commercially available standard-of-care product. Such a material may hold promise for a single-surgery treatment of severe traumatic brain injury (TBI) following hemicraniectomy.
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Kelly SM, Mitra A, Mathur S, Narasimhan B. Synthesis and Characterization of Rapidly Degrading Polyanhydrides as Vaccine Adjuvants. ACS Biomater Sci Eng 2020; 6:265-276. [PMID: 33463223 DOI: 10.1021/acsbiomaterials.9b01427] [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] [Indexed: 12/12/2022]
Abstract
There is a currently a need to develop adjuvants that are best suited to simultaneously enhance immune responses, induce immunologic memory, improve patient compliance (i.e., reduce doses and inflammation), and provide vaccine shelf stability for stockpiling and global deployment to challenging environments. Biodegradable polyanhydrides have been investigated extensively to overcome such challenges. It has been shown that controlling copolymer composition can result in chemistry-dependent immunomodulatory capabilities. These studies have revealed that copolymers rich in sebacic acid (SA) are highly internalized by antigen presenting cells and confer improved shelf stability of encapsulated proteins, while copolymers rich in 1,8-bis(p-carboxyphenoxy)-3,6-dioxaoctane (CPTEG) also exhibit enhanced internalization by and activation of antigen presenting cells (APCs), in addition to providing superior retention of protein stability following encapsulation and release. However, to date, CPTEG:SA copolymers have not been synthesized and described. In this work, we hypothesized that new copolymers composed of CPTEG and SA would combine the advantages of both monomers in terms of enhanced thermal properties, maintaining antigenicity of encapsulated proteins following nanoparticle synthesis, and superior cellular internalization and activation by APCs, demonstrated by the upregulation of costimulatory markers CD80, CD86, and CD40, as well as the secretion of proinflammatory cytokines IL-6, IL-1β, and TNF-α. Herein, we describe the synthesis and design of novel CPTEG:SA nanoparticles with improved thermal properties, payload stability, and internalization by antigen presenting cells for applications in vaccine delivery. The performance of these new CPTEG:SA formulations was compared to that of traditional polyanhydride copolymers.
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Affiliation(s)
- Sean M Kelly
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Akash Mitra
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Srishti Mathur
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Balaji Narasimhan
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States.,Nanovaccine Institute, Iowa State University, Ames, Iowa 50011-1098, United States
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18
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Oria M, Tatu RR, Lin CY, Peiro JL. In Vivo Evaluation of Novel PLA/PCL Polymeric Patch in Rats for Potential Spina Bifida Coverage. J Surg Res 2019; 242:62-69. [PMID: 31071606 DOI: 10.1016/j.jss.2019.04.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 02/20/2019] [Accepted: 04/09/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND Current therapeutic materials for spina bifida repair showed a limited number of options in the market, and none of them have all the requirements as the ideal patch. In fact, sometimes the surgical procedures pose substantial challenges using different patches to fully cover the spina bifida lesion. For this purpose, a tailored patch made of poly (L-lactic acid) and poly (ε-caprolactone) blend was designed and validated in vitro to accomplish all these requirements but was never tested in vivo. MATERIAL AND METHODS In our present study, the designed patch was analyzed in terms of rejection from the animal when implanted subcutaneously and as a dural substitute in the spinal cord. Inflammatory reaction (Iba1), astrogliosis (GFAP), was analyzed and functional interaction with spinal cord tissue assessing the (%motor-evoked potentials /compound motor action potential) by electrophysiology. RESULTS No evidence of adverse or inflammatory reactions was observed in both models of subcutaneous implantation, neither in the neural tissue as a dural substitute. No signs of astrogliosis in the neural tissue were observed, and no functional alteration with improvement of the motor-evoked potential's amplitude was detected after 4 wk of implantation as a dural substitute in the rat spinal cord. CONCLUSIONS Designed patch used as a dural substitute will apparently not produce inflammation, scar formation, or tethering cord and not induce any adverse effect on regular functions of the spinal cord. Further studies are needed to evaluate potential improvements of this novel polymeric patch in the spinal cord regeneration using spina bifida models.
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Affiliation(s)
- Marc Oria
- Division of Pediatric General and Thoracic Surgery, Center for Fetal and Placental Research, Cincinnati Children's Hospital Medical Center (CCHMC), Cincinnati, Ohio
| | - Rigwed R Tatu
- Department of Biomedical Engineering, Structural Tissue Evaluation and Engineering Laboratory, University of Cincinnati, Cincinnati, Ohio
| | - Chia-Ying Lin
- Department of Biomedical Engineering, Structural Tissue Evaluation and Engineering Laboratory, University of Cincinnati, Cincinnati, Ohio
| | - Jose L Peiro
- Division of Pediatric General and Thoracic Surgery, Center for Fetal and Placental Research, Cincinnati Children's Hospital Medical Center (CCHMC), Cincinnati, Ohio.
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19
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Lu J, Guan F, Cui F, Sun X, Zhao L, Wang Y, Wang X. Enhanced angiogenesis by the hyaluronic acid hydrogels immobilized with a VEGF mimetic peptide in a traumatic brain injury model in rats. Regen Biomater 2019; 6:325-334. [PMID: 31827886 PMCID: PMC6897340 DOI: 10.1093/rb/rbz027] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 06/20/2019] [Accepted: 07/07/2019] [Indexed: 01/03/2023] Open
Abstract
Angiogenesis plays an important role in brain injury repair, which contributes to the reconstruction of regenerative neurovascular niche for promoting axonal regeneration in the lesion area. As a major component of developing brain extracellular matrix, hyaluronic acid (HA) has attracted more attention as a supporting matrix for brain repair. In the present study, HA-KLT hydrogel was developed via modifying HA with a VEGF mimetic peptide of KLT (KLTWQELYQLKYKGI). The characterization of the hydrogel shows that it could provide a porous, three-dimensional scaffold structure, which has a large specific surface area available for cell adhesion and interaction. Compared with the unmodified HA hydrogel, the HA-KLT hydrogel could effectively promote the attachment, spreading and proliferation of endothelial cells in vitro. Furthermore, the pro-angiogenic ability of hydrogels in vivo was evaluated by implanting them into the lesion cavities in the injured rat brain. Our results showed that the hydrogels could form a permissive interface with the host tissues at 4 weeks after implantation. Moreover, they could efficiently inhibit the formation of glial scars at the injured sites. The HA-KLT hydrogel could significantly increase the expression of endoglin/CD105 and promote the formation of blood vessels, suggesting that HA-KLT hydrogel promoted angiogenesis in vivo. Collectively, the HA-KLT hydrogel has the potential to repair brain defects by promoting angiogenesis and inhibiting the formation of glial-derived scar tissue.
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Affiliation(s)
- Jiaju Lu
- State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Fengyi Guan
- State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Fuzhai Cui
- State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Xiaodan Sun
- State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Lingyun Zhao
- State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Ying Wang
- Beijing Center of Neutral Regeneration and Repair, Key Laboratory for Neurodegenerative Disease of the Ministry of Education, Capital Medical University, Beijing 100069, China
| | - Xiumei Wang
- State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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20
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Arunkumar P, Dougherty JA, Weist J, Kumar N, Angelos MG, Powell HM, Khan M. Sustained Release of Basic Fibroblast Growth Factor (bFGF) Encapsulated Polycaprolactone (PCL) Microspheres Promote Angiogenesis In Vivo. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E1037. [PMID: 31330782 PMCID: PMC6669517 DOI: 10.3390/nano9071037] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/14/2019] [Accepted: 07/17/2019] [Indexed: 12/15/2022]
Abstract
Coronary heart disease (CHD) is the leading cause of death in the Unites States and globally. The administration of growth factors to preserve cardiac function after myocardial infarction (MI) is currently being explored. Basic fibroblast growth factor (bFGF), a potent angiogenic factor has poor clinical efficacy due to its short biological half-life and low plasma stability. The goal of this study was to develop bFGF-loaded polycaprolactone (PCL) microspheres for sustained release of bFGF and to evaluate its angiogenic potential. The bFGF-PCL microspheres (bFGF-PCL-MS) were fabricated using the emulsion solvent-evaporation method and found to have spherical morphology with a mean size of 4.21 ± 1.28 µm. In vitro bFGF release studies showed a controlled release for up to 30 days. Treatment of HUVECs with bFGF-PCL-MS in vitro enhanced their cell proliferation and migration properties when compared to the untreated control group. Treatment of HUVECs with release media from bFGF-PCL-MS also significantly increased expression of angiogenic genes (bFGF and VEGFA) as compared to untreated cells. The in vivo angiogenic potential of these bFGF-PCL-MS was further confirmed in rats using a Matrigel plug assay with subsequent immunohistochemical staining showing increased expression of angiogenic markers. Overall, bFGF-PCL-MS could serve as a potential angiogenic agent to promote cell survival and angiogenesis following an acute myocardial infarction.
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Affiliation(s)
- Pala Arunkumar
- Department of Emergency Medicine, College of Medicine, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - Julie A Dougherty
- Department of Emergency Medicine, College of Medicine, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - Jessica Weist
- Department of Emergency Medicine, College of Medicine, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - Naresh Kumar
- Department of Emergency Medicine, College of Medicine, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - Mark G Angelos
- Department of Emergency Medicine, College of Medicine, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - Heather M Powell
- Department of Materials Science and Engineering, Department of Biomedical Engineering, The Ohio State University, Columbus, OH 43210, USA
- Research Department, Shriners Hospitals for Children, Cincinnati, OH 43210, USA
| | - Mahmood Khan
- Department of Emergency Medicine, College of Medicine, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA.
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21
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Englert C, Brendel JC, Majdanski TC, Yildirim T, Schubert S, Gottschaldt M, Windhab N, Schubert US. Pharmapolymers in the 21st century: Synthetic polymers in drug delivery applications. Prog Polym Sci 2018. [DOI: 10.1016/j.progpolymsci.2018.07.005] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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22
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Superior calvarial bone regeneration using pentenoate-functionalized hyaluronic acid hydrogels with devitalized tendon particles. Acta Biomater 2018; 71:148-155. [PMID: 29496620 DOI: 10.1016/j.actbio.2018.02.013] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 02/07/2018] [Accepted: 02/09/2018] [Indexed: 12/30/2022]
Abstract
Traumatic brain injury (TBI) is a life-threatening condition defined by internal brain herniation. Severe TBI is commonly treated by a two-stage surgical intervention, where decompressive craniectomy is first conducted to remove a large portion of calvarial bone and allow unimpeded brain swelling. In the second surgery, spaced weeks to months after the first, cranioplasty is performed to restore the cranial bone. Hydrogels with paste-like precursor solutions for surgical placement may potentially revolutionize TBI treatment by permitting a single-stage surgical intervention, capable of being implanted with the initial surgery, remaining pliable during brain swelling, and tuned to regenerate calvarial bone after brain swelling has subsided. The current study evaluated the use of photocrosslinkable pentenoate-functionalized hyaluronic acid (PHA) and non-crosslinking hyaluronic acid (HA) hydrogels encapsulating naturally derived tissue particles of demineralized bone matrix (DBM), devitalized cartilage (DVC), devitalized meniscus (DVM), or devitalized tendon (DVT) for bone regeneration in critical-size rat calvarial defects. All hydrogel precursors exhibited a yield stress for placement and addition of particles increased the average material compressive modulus. The HA-DBM (4-30%), PHA (4%), and PHA-DVT (4-30%) groups had 5 (p < 0.0001), 3.1, and 3.2 (p < 0.05) times greater regenerated bone volume compared to the sham (untreated defect) group, respectively. In vitro cell studies suggested that the PHA-DVT (4-10%) group would have the most desirable performance. Overall, hydrogels containing DVT particles outperformed other materials in terms of bone regeneration in vivo and calcium deposition in vitro. Hydrogels containing DVT will be further evaluated in future rat TBI studies. STATEMENT OF SIGNIFICANCE Traumatic brain injury (TBI) is a life-threatening condition characterized by severe brain swelling and is currently treated by a two-stage surgical procedure. Complications associated with the two-stage surgical intervention include the occurrence of the condition termed syndrome of the trephined; however, the condition is completely reversible once the secondary surgery is performed. A desirable TBI treatment would include a single surgical intervention to avoid syndrome of the trephined altogether. The first hurdle in reaching the overall goal is to develop a pliable hydrogel material that can regenerate the patient's bone. The development of a pliable hydrogel technology would greatly impact the field of bone regeneration for TBI application and other areas of bone regeneration.
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23
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Biomaterial Scaffolds in Regenerative Therapy of the Central Nervous System. BIOMED RESEARCH INTERNATIONAL 2018; 2018:7848901. [PMID: 29805977 PMCID: PMC5899851 DOI: 10.1155/2018/7848901] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 02/18/2018] [Accepted: 02/21/2018] [Indexed: 02/08/2023]
Abstract
The central nervous system (CNS) is the most important section of the nervous system as it regulates the function of various organs. Injury to the CNS causes impairment of neurological functions in corresponding sites and further leads to long-term patient disability. CNS regeneration is difficult because of its poor response to treatment and, to date, no effective therapies have been found to rectify CNS injuries. Biomaterial scaffolds have been applied with promising results in regeneration medicine. They also show great potential in CNS regeneration for tissue repair and functional recovery. Biomaterial scaffolds are applied in CNS regeneration predominantly as hydrogels and biodegradable scaffolds. They can act as cellular supportive scaffolds to facilitate cell infiltration and proliferation. They can also be combined with cell therapy to repair CNS injury. This review discusses the categories and progression of the biomaterial scaffolds that are applied in CNS regeneration.
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24
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Townsend JM, Zabel TA, Feng Y, Wang J, Andrews BT, Nudo RJ, Berkland CJ, Detamore MS. Effects of tissue processing on bioactivity of cartilage matrix-based hydrogels encapsulating osteoconductive particles. ACTA ACUST UNITED AC 2018; 13:034108. [PMID: 29411714 DOI: 10.1088/1748-605x/aaad77] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In the treatment of severe traumatic brain injury (TBI), decompressive craniectomy is commonly used to remove a large portion of calvarial bone to allow unimpeded brain swelling. Hydrogels have the potential to revolutionize TBI treatment by permitting a single-surgical intervention, remaining pliable during brain swelling, and tuned to regenerate bone after swelling has subsided. With this motivation, our goal is to present a pliable material capable of regenerating calvarial bone across a critical size defect. We therefore proposed the use of a methacrylated solubilized decellularized cartilage (MeSDCC) hydrogel encapsulating synthetic osteogenic particles of hydroxyapatite nanofibers, bioglass microparticles, or added rat bone marrow-derived mesenchymal stem cells (rMSCs) for bone regeneration in critical-size rat calvarial defects. Fibrin hydrogels were employed as a control material for the study. MeSDCC hydrogels exhibited sufficient rheological performance for material placement before crosslinking ([Formula: see text] > 500 Pa), and sufficient compressive moduli post-crosslinking (E > 150 kPa). In vitro experiments suggested increased calcium deposition for cells seeded on the MeSDCC material; however, in vivo bone regeneration was minimal in both MeSDCC and fibrin groups, even with colloidal materials or added rMSCs. Minimal bone regeneration in the MeSDCC test groups may potentially be attributed to cartilage solubilization after decellularization, in which material signals may have degraded from enzymatic treatment. Looking to the future, an improvement in the bioactivity of the material will be crucial to the success of bone regeneration strategies for TBI treatment.
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Affiliation(s)
- Jakob M Townsend
- Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, OK 73019, United States of America
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25
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Kim MH, Park JH, Joo S, Hong D, Park M, Choi JY, Moon HW, Kim YG, Kang K, Choi IS. Accelerated Development of Hippocampal Neurons and Limited Adhesion of Astrocytes on Negatively Charged Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:1767-1774. [PMID: 29278669 DOI: 10.1021/acs.langmuir.7b03132] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This work examines the development of primary neurons and astrocytes on thoroughly controlled functional groups. Negatively charged surfaces presenting carboxylate (COO-) or sulfonate (SO3-) groups prove beneficial to neuronal behavior, in spite of their supposed repulsive electrostatic interactions with cellular membranes. The adhesion and survival of primary hippocampal neurons on negatively charged surfaces are comparable to or slightly better than those on positively charged (poly-d-lysine-coated) surfaces, and neuritogenesis and neurite outgrowth are accelerated on COO- and SO3- surfaces. Moreover, such favorable influences of the negatively charged surfaces are only seen in neurons but not for astrocytes. Our results indicate that the in vitro developmental behavior of primary hippocampal neurons is sophisticatedly modulated by angstrom-sized differences in chemical structure or the charge density of the surface. We believe that this work provides new implications for understanding neuron-material interfaces as well as for establishing new ways to fabricate neuro-active surfaces.
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Affiliation(s)
- Mi-Hee Kim
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Ji Hun Park
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Sunghoon Joo
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Daewha Hong
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University , Busan 46241, Korea
| | - Matthew Park
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Ji Yu Choi
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Hye Won Moon
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Yang-Gyun Kim
- Department of Chemistry, Sungkyunkwan University , Suwon, Gyeonggi 16419, Korea
| | - Kyungtae Kang
- Department of Applied Chemistry, Kyung Hee University , Yongin, Gyeonggi 17104, Korea
| | - Insung S Choi
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
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26
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Santhosh KT, Alizadeh A, Karimi-Abdolrezaee S. Design and optimization of PLGA microparticles for controlled and local delivery of Neuregulin-1 in traumatic spinal cord injury. J Control Release 2017; 261:147-162. [PMID: 28668379 DOI: 10.1016/j.jconrel.2017.06.030] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 06/21/2017] [Accepted: 06/27/2017] [Indexed: 12/17/2022]
Abstract
Spinal cord injury (SCI) results in significant tissue damage that underlies functional impairments. Pharmacological interventions to confer neuroprotection and promote cell replacement are essential for SCI repair. We previously reported that Neuregulin-1 (Nrg-1) is acutely and permanently downregulated after SCI. Nrg-1 is a critical growth factor for differentiation of neural precursor cells (NPCs) into myelinating oligodendrocytes. We showed that intrathecal delivery of Nrg-1 enhances oligodendrocyte replacement following SCI. While an effective delivery system, intrathecal and systemic administration of growth factors with diverse biological targets may pose adverse off-target effects. Here, we have developed and optimized an injectable biodegradable poly(lactic-co-glycolic acid) (PLGA) microparticles system for sustained and prolonged intraspinal delivery of Nrg-1 in SCI. Recombinant human Nrg-1β1 peptide was encapsulated into PLGA microparticles. Optimal Nrg-1 release rate and duration were achieved by manipulating the porosity and size of PLGA particles. Our in vitro analysis showed a direct correlation between particle size and porosity with Nrg-1 release rate, while Nrg-1 loading efficiency in PLGA microparticles was inversely correlated with particle porosity. In SCI, local intraspinal injection of PLGA-Nrg-1 microparticles maintained significantly higher tissue levels of Nrg-1 for a long-term duration compared to Nrg-1 delivered intrathecally by osmotic pumps. Bioactivity of Nrg-1 in PLGA microparticles was verified by promoting oligodendrocyte differentiation of NPCs in vitro, and preservation of oligodendrocytes and axons in SCI. PLGA-Nrg-1 also attenuated neuroinflammation and glial scarring following SCI. We show, for the first time, the feasibility, efficacy and safety of PLGA microparticle system for local and controlled administration of Nrg-1 in SCI.
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Affiliation(s)
- Kallivalappil T Santhosh
- Regenerative Medicine Program, Department of Physiology and Pathophysiology, Spinal Cord Research Centre, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Arsalan Alizadeh
- Regenerative Medicine Program, Department of Physiology and Pathophysiology, Spinal Cord Research Centre, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Soheila Karimi-Abdolrezaee
- Regenerative Medicine Program, Department of Physiology and Pathophysiology, Spinal Cord Research Centre, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada.
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27
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Madhusudanan P, Reade S, Shankarappa SA. Neuroglia as targets for drug delivery systems: A review. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2017; 13:667-679. [DOI: 10.1016/j.nano.2016.08.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 08/01/2016] [Accepted: 08/04/2016] [Indexed: 12/13/2022]
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28
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Fu F, Qin Z, Xu C, Chen XY, Li RX, Wang LN, Peng DW, Sun HT, Tu Y, Chen C, Zhang S, Zhao ML, Li XH. Magnetic resonance imaging-three-dimensional printing technology fabricates customized scaffolds for brain tissue engineering. Neural Regen Res 2017; 12:614-622. [PMID: 28553343 PMCID: PMC5436361 DOI: 10.4103/1673-5374.205101] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Conventional fabrication methods lack the ability to control both macro- and micro-structures of generated scaffolds. Three-dimensional printing is a solid free-form fabrication method that provides novel ways to create customized scaffolds with high precision and accuracy. In this study, an electrically controlled cortical impactor was used to induce randomized brain tissue defects. The overall shape of scaffolds was designed using rat-specific anatomical data obtained from magnetic resonance imaging, and the internal structure was created by computer-aided design. As the result of limitations arising from insufficient resolution of the manufacturing process, we magnified the size of the cavity model prototype five-fold to successfully fabricate customized collagen-chitosan scaffolds using three-dimensional printing. Results demonstrated that scaffolds have three-dimensional porous structures, high porosity, highly specific surface areas, pore connectivity and good internal characteristics. Neural stem cells co-cultured with scaffolds showed good viability, indicating good biocompatibility and biodegradability. This technique may be a promising new strategy for regenerating complex damaged brain tissues, and helps pave the way toward personalized medicine.
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Affiliation(s)
- Feng Fu
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Zhe Qin
- Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China
| | - Chao Xu
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Xu-Yi Chen
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Rui-Xin Li
- Institute of Medical Equipment, The Academy of Military Medical Sciences, Tianjin, China
| | - Li-Na Wang
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Ding-Wei Peng
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Hong-Tao Sun
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Yue Tu
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Chong Chen
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Sai Zhang
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Ming-Liang Zhao
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
| | - Xiao-Hong Li
- Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, China.,Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China
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29
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Sharifi F, Patel BB, Dzuilko AK, Montazami R, Sakaguchi DS, Hashemi N. Polycaprolactone Microfibrous Scaffolds to Navigate Neural Stem Cells. Biomacromolecules 2016; 17:3287-3297. [PMID: 27598294 DOI: 10.1021/acs.biomac.6b01028] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fibrous scaffolds have shown promise in tissue engineering due to their ability to improve cell alignment and migration. In this paper, poly(ε-caprolactone) (PCL) fibers are fabricated in different sizes using a microfluidic platform. By using this approach, we demonstrated considerable flexibility in ability to control the size of the fibers. It was shown that the average diameter of the fibers was obtained in the range of 2.6-36.5 μm by selecting the PCL solution flow rate from 1 to 5 μL min-1 and the sheath flow rate from 20 to 400 μL min-1 in the microfluidic channel. The microfibers were used to create 3D microenvironments in order to investigate growth and differentiation of adult hippocampal stem/progenitor cells (AHPCs) in vitro. The results indicated that the 3D topography of the PCL substrates, along with chemical (extracellular matrix) guidance cues supported the adhesion, survival, and differentiation of the AHPCs. Additionally, it was found that the cell deviation angle for 44-66% of cells on different types of fibers was less than 10°. This reveals the functionality of PCL fibrous scaffolds for cell alignment important in applications such as reconnecting serious nerve injuries and guiding the direction of axon growth as well as regenerating blood vessels, tendons, and muscle tissue.
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Affiliation(s)
- Farrokh Sharifi
- Department of Mechanical Engineering, ‡Department of Genetics, Development and Cell Biology and Neuroscience, and §Center of Advanced Host Defense Immunobiotics and Translational Medicine, Iowa State University , Ames, Iowa 50011, United States
| | - Bhavika B Patel
- Department of Mechanical Engineering, ‡Department of Genetics, Development and Cell Biology and Neuroscience, and §Center of Advanced Host Defense Immunobiotics and Translational Medicine, Iowa State University , Ames, Iowa 50011, United States
| | - Adam K Dzuilko
- Department of Mechanical Engineering, ‡Department of Genetics, Development and Cell Biology and Neuroscience, and §Center of Advanced Host Defense Immunobiotics and Translational Medicine, Iowa State University , Ames, Iowa 50011, United States
| | - Reza Montazami
- Department of Mechanical Engineering, ‡Department of Genetics, Development and Cell Biology and Neuroscience, and §Center of Advanced Host Defense Immunobiotics and Translational Medicine, Iowa State University , Ames, Iowa 50011, United States
| | - Donald S Sakaguchi
- Department of Mechanical Engineering, ‡Department of Genetics, Development and Cell Biology and Neuroscience, and §Center of Advanced Host Defense Immunobiotics and Translational Medicine, Iowa State University , Ames, Iowa 50011, United States
| | - Nastaran Hashemi
- Department of Mechanical Engineering, ‡Department of Genetics, Development and Cell Biology and Neuroscience, and §Center of Advanced Host Defense Immunobiotics and Translational Medicine, Iowa State University , Ames, Iowa 50011, United States
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30
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Biomaterial Applications in Cell-Based Therapy in Experimental Stroke. Stem Cells Int 2016; 2016:6810562. [PMID: 27274738 PMCID: PMC4870368 DOI: 10.1155/2016/6810562] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 03/11/2016] [Accepted: 04/04/2016] [Indexed: 01/08/2023] Open
Abstract
Stroke is an important health issue corresponding to the second cause of mortality and first cause of severe disability with no effective treatments after the first hours of onset. Regenerative approaches such as cell therapy provide an increase in endogenous brain structural plasticity but they are not enough to promote a complete recovery. Tissue engineering has recently aroused a major interesting development of biomaterials for use into the central nervous system. Many biomaterials have been engineered based on natural compounds, synthetic compounds, or a mix of both with the aim of providing polymers with specific properties. The mechanical properties of biomaterials can be exquisitely regulated forming polymers with different stiffness, modifiable physical state that polymerizes in situ, or small particles encapsulating cells or growth factors. The choice of biomaterial compounds should be adapted for the different applications, structure target, and delay of administration. Biocompatibilities with embedded cells and with the host tissue and biodegradation rate must be considerate. In this paper, we review the different applications of biomaterials combined with cell therapy in ischemic stroke and we explore specific features such as choice of biomaterial compounds and physical and mechanical properties concerning the recent studies in experimental stroke.
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31
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Gao Y, Yang Z, Li X. Regeneration strategies after the adult mammalian central nervous system injury-biomaterials. Regen Biomater 2016; 3:115-22. [PMID: 27047678 PMCID: PMC4817328 DOI: 10.1093/rb/rbw004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 01/04/2016] [Indexed: 01/12/2023] Open
Abstract
The central nervous system (CNS) has very restricted intrinsic regeneration ability under the injury or disease condition. Innovative repair strategies, therefore, are urgently needed to facilitate tissue regeneration and functional recovery. The published tissue repair/regeneration strategies, such as cell and/or drug delivery, has been demonstrated to have some therapeutic effects on experimental animal models, but can hardly find clinical applications due to such methods as the extremely low survival rate of transplanted cells, difficulty in integrating with the host or restriction of blood–brain barriers to administration patterns. Using biomaterials can not only increase the survival rate of grafts and their integration with the host in the injured CNS area, but also sustainably deliver bioproducts to the local injured area, thus improving the microenvironment in that area. This review mainly introduces the advances of various strategies concerning facilitating CNS regeneration.
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Affiliation(s)
- Yudan Gao
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - Zhaoyang Yang
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China,; Department of Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
| | - Xiaoguang Li
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China,; Department of Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
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Rocamonde B, Paradells S, Garcia Esparza MA, Vives MS, Sauro S, Ramos CM, Pradas MM, Soria JM. Combined application of polyacrylate scaffold and lipoic acid treatment promotes neural tissue reparation after brain injury. Brain Inj 2016; 30:208-16. [PMID: 26745450 DOI: 10.3109/02699052.2015.1091505] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
PRIMARY OBJECTIVE The aim of this study was to investigate the reparative potential of a polymeric scaffold designed for brain tissue repair in combination with lipoic acid. RESEARCH DESIGN Histological, cytological and structural analysis of a combined treatment after a brain cryo-injury model in rats. METHODS AND PROCEDURES Adult Wistar rats were subjected to cryogenic brain injury. A channelled-porous scaffold of ethyl acrylate and hydroxyethylacrylate, p(EA-co-HEA) was grafted into cerebral penumbra alone or combined with intraperitoneal LA administration. Histological and cytological evaluation was performed after 15 and 60 days and structural magnetic resonance (MRI) assessment was performed at 2 and 6 months after the surgery. MAIN OUTCOMES AND RESULTS The scaffold was suitable for the establishment of different cellular types. The results obtained suggest that this strategy promotes blood vessels formation, decreased microglial response and neuron migration, particularly when LA was administrated. CONCLUSIONS These evidences demonstrated that the combination of a channelled polymer scaffold with LA administration may represent a potential treatment for neural tissue repair after brain injury.
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Affiliation(s)
- Brenda Rocamonde
- a Facultad Ciencias de la Salud, Universidad CEU-Cardenal Herrera , Valencia , Spain
| | - Sara Paradells
- a Facultad Ciencias de la Salud, Universidad CEU-Cardenal Herrera , Valencia , Spain
| | | | - Mavi Sánchez Vives
- b Institut D'Investigacions Biomèdiques August Pi i Sunyer-IDIBAPS , Barcelona , Spain
| | - Salvatore Sauro
- a Facultad Ciencias de la Salud, Universidad CEU-Cardenal Herrera , Valencia , Spain
| | - Cristina Martínez Ramos
- c Centro de Biomateriales e Ingeniería Tisular, Universidad Politécnica de Valencia , Valencia , Spain
| | - Manuel Monleón Pradas
- c Centro de Biomateriales e Ingeniería Tisular, Universidad Politécnica de Valencia , Valencia , Spain
| | - José Miguel Soria
- a Facultad Ciencias de la Salud, Universidad CEU-Cardenal Herrera , Valencia , Spain.,d Instituto de Ciencias Biomédicas, Universidad CEU-Cardenal Herrera , Moncada , Valencia , Spain
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Patel JJ, Modes JE, Flanagan CL, Krebsbach PH, Edwards SP, Hollister SJ. Dual Delivery of EPO and BMP2 from a Novel Modular Poly-ɛ-Caprolactone Construct to Increase the Bone Formation in Prefabricated Bone Flaps. Tissue Eng Part C Methods 2015; 21:889-97. [PMID: 25809081 DOI: 10.1089/ten.tec.2014.0643] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Poly-ɛ-caprolactone (PCL) is a biocompatible polymer that has mechanical properties suitable for bone tissue engineering; however, it must be integrated with biologics to stimulate bone formation. Bone morphogenetic protein-2 (BMP2) delivered from PCL produces bone when implanted subcutaneously, and erythropoietin (EPO) works synergistically with BMP2. In this study, EPO and BMP2 are adsorbed separately on two 3D-printed PCL scaffold modules that are assembled for codelivery on a single scaffold structure. This assembled modular PCL scaffold with dual BMP2 and EPO delivery was shown to increase bone growth in an ectopic location when compared with BMP2 delivery along a replicate scaffold structure. EPO (200 IU/mL) and BMP2 (65 μg/mL) were adsorbed onto the outer and inner portions of a modular scaffold, respectively. Protein binding and release studies were first quantified. Subsequently, EPO+BMP2 and BMP2 scaffolds were implanted subcutaneously in mice for 4 and 8 weeks, and the regenerated bone was analyzed with microcomputed tomography and histology; 8.6±1.4 μg BMP2 (22%) and 140±29 IU EPO (69.8%) bound to the scaffold and <1% BMP2 and 83% EPO was released in 7 days. Increased endothelial cell proliferation on EPO-adsorbed PCL discs indicated protein bioactivity. At 4 and 8 weeks, dual BMP2 and EPO delivery regenerated more bone (5.1±1.1 and 5.5±1.6 mm(3)) than BMP2 alone (3.8±1.1 and 4.3±1.7 mm(3)). BMP2 and EPO scaffolds had more ingrowth (1.4%±0.6%) in the outer module when compared with BMP2 (0.8%±0.3%) at 4 weeks. Dual delivery produced more dense cellular marrow, while BMP2 had more fatty marrow. Dual EPO and BMP2 delivery is a potential method to regenerate bone faster for prefabricated flaps.
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Affiliation(s)
- Janki Jayesh Patel
- 1 Department of Biomedical Engineering, University of Michigan , Ann Arbor, Michigan
| | - Jane E Modes
- 1 Department of Biomedical Engineering, University of Michigan , Ann Arbor, Michigan
| | - Colleen L Flanagan
- 1 Department of Biomedical Engineering, University of Michigan , Ann Arbor, Michigan
| | - Paul H Krebsbach
- 2 School of Dentistry, University of Michigan , Ann Arbor, Michigan
| | - Sean P Edwards
- 3 Department of Oral and Maxillofacial Surgery, University of Michigan , Ann Arbor, Michigan
| | - Scott J Hollister
- 1 Department of Biomedical Engineering, University of Michigan , Ann Arbor, Michigan
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O'Shea RD, Lau CL, Zulaziz N, Maclean FL, Nisbet DR, Horne MK, Beart PM. Transcriptomic analysis and 3D bioengineering of astrocytes indicate ROCK inhibition produces cytotrophic astrogliosis. Front Neurosci 2015; 9:50. [PMID: 25750613 PMCID: PMC4335181 DOI: 10.3389/fnins.2015.00050] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Accepted: 02/04/2015] [Indexed: 01/07/2023] Open
Abstract
Astrocytes provide trophic, structural and metabolic support to neurons, and are considered genuine targets in regenerative neurobiology, as their phenotype arbitrates brain integrity during injury. Inhibitors of Rho kinase (ROCK) cause stellation of cultured 2D astrocytes, increased L-glutamate transport, augmented G-actin, and elevated expression of BDNF and anti-oxidant genes. Here we further explored the signposts of a cytotrophic, “healthy” phenotype by data-mining of our astrocytic transcriptome in the presence of Fasudil. Gene expression profiles of motor and autophagic cellular cascades and inflammatory/angiogenic responses were all inhibited, favoring adoption of an anti-migratory phenotype. Like ROCK inhibition, tissue engineered bioscaffolds can influence the extracellular matrix. We built upon our evidence that astrocytes maintained on 3D poly-ε-caprolactone (PCL) electrospun scaffolds adopt a cytotrophic phenotype similar to that produced by Fasudil. Using these procedures, employing mature 3D cultured astrocytes, Fasudil (100 μM) or Y27632 (30 μM) added for the last 72 h of culture altered arborization, which featured numerous additional minor processes as shown by GFAP and AHNAK immunolabelling. Both ROCK inhibitors decreased F-actin, but increased G-actin labeling, indicative of disassembly of actin stress fibers. ROCK inhibitors provide additional beneficial effects for bioengineered 3D astrocytes, including enlargement of the overall arbor. Potentially, the combined strategy of bio-compatible scaffolds with ROCK inhibition offers unique advantages for the management of glial scarring. Overall these data emphasize that manipulation of the astrocyte phenotype to achieve a “healthy biology” offers new hope for the management of inflammation in neuropathologies.
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Affiliation(s)
- Ross D O'Shea
- Department of Physiology, Anatomy and Microbiology, La Trobe University Bundoora, VIC, Australia
| | - Chew L Lau
- Florey Institute of Neuroscience and Mental Health, University of Melbourne Parkville, VIC, Australia
| | - Natasha Zulaziz
- Department of Physiology, Anatomy and Microbiology, La Trobe University Bundoora, VIC, Australia
| | - Francesca L Maclean
- Research School of Engineering, The Australian National University Canberra, ACT, Australia
| | - David R Nisbet
- Research School of Engineering, The Australian National University Canberra, ACT, Australia
| | - Malcolm K Horne
- Florey Institute of Neuroscience and Mental Health, University of Melbourne Parkville, VIC, Australia ; Department of Neurology, St. Vincent's Hospital Fitzroy, VIC, Australia
| | - Philip M Beart
- Florey Institute of Neuroscience and Mental Health, University of Melbourne Parkville, VIC, Australia
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Patel JJ, Flanagan CL, Hollister SJ. Bone Morphogenetic Protein-2 Adsorption onto Poly-ɛ-caprolactone Better Preserves Bioactivity In Vitro and Produces More Bone In Vivo than Conjugation Under Clinically Relevant Loading Scenarios. Tissue Eng Part C Methods 2015; 21:489-98. [PMID: 25345571 DOI: 10.1089/ten.tec.2014.0377] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND One strategy to reconstruct large bone defects is to prefabricate a vascularized flap by implanting a biomaterial scaffold with associated biologics into the latissimus dorsi and then transplanting this construct to the defect site after a maturation period. This strategy, similar to all clinically and regulatory feasible biologic approaches to surgical reconstruction, requires the ability to quickly (<1 h within an operating room) and efficiently bind biologics to scaffolds. It also requires the ability to localize biologic delivery. In this study, we investigated the efficacy of binding bone morphogenetic protein-2 (BMP2) to poly-ɛ-caprolactone (PCL) using adsorption and conjugation as a function of time. METHODS BMP2 was adsorbed (Ads) or conjugated (Conj) to PCL scaffolds with the same three-dimensional printed architecture while altering exposure time (0.5, 1, 5, and 16 h), temperature (4°C, 23°C), and BMP2 concentration (1.4, 5, 20, and 65 μg/mL). The in vitro release was quantified, and C2C12 cell alkaline phosphatase (ALP) expression was used to confirm bioactivity. Scaffolds with either 65 or 20 μg/mL Ads or Conj BMP2 for 1 h at 23°C were implanted subcutaneously in mice to evaluate in vivo bone regeneration. Micro-computed tomography, compression testing, and histology were performed to characterize bone regeneration. RESULTS After 1 h exposure to 65 μg/mL BMP2 at 23°C, Conj and Ads resulted in 12.83 ± 1.78 and 10.78 ± 1.49 μg BMP2 attached, respectively. Adsorption resulted in a positive ALP response and had a small burst release; whereas conjugation provided a sustained release with negligible ALP production, indicating that the conjugated BMP2 may not be bioavailable. Adsorbed 65 μg/mL BMP2 solution resulted in the greatest regenerated bone volume (15.0 ± 3.0 mm³), elastic modulus (20.1 ± 3.0 MPa), and %bone ingrowth in the scaffold interior (17.2% ± 5.4%) when compared with conjugation. CONCLUSION Adsorption may be optimal for the clinical application of prefabricating bone flaps due to BMP2 binding in a short exposure time, retained BMP2 bioactivity, and bone growth adhering to scaffold geometry and into pores with healthy marrow development.
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Affiliation(s)
- Janki J Patel
- Department of Biomedical Engineering, University of Michigan , Ann Arbor, Michigan
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Nga VDW, Lim J, Choy DKS, Nyein MA, Lu J, Chou N, Yeo TT, Teoh SH. Effects of polycaprolactone-based scaffolds on the blood-brain barrier and cerebral inflammation. Tissue Eng Part A 2015; 21:647-53. [PMID: 25335965 DOI: 10.1089/ten.tea.2013.0779] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Severe pathoanatomical and mechanical injuries compromise patient recovery and survival following penetrating brain injury (PBI). The realization that the blood-brain barrier (BBB) plays a major role in dictating post-PBI events has led to rising interests in possible therapeutic interventions through the BBB. Recently, the choroid plexus has also been suggested as a potential therapeutic target. The use of biocompatible scaffolds for the delivery of therapeutic agents, but little is known about their interaction with cerebral tissue, which has important clinical implications. Therefore, the authors have sought to investigate the effect of polycaprolactone (PCL) and PCL/tricalcium phosphate (PCL/TCP) scaffolds on the maintenance of BBB phenotype posttraumatic brain injury. Cranial defects of 3 mm depth were created in Sprague Dawley rats, and PCL and PCL/TCP scaffolds were subsequently implanted in predetermined locations for a period of 1 week and 1 month. Higher endothelial barrier antigen (EBA) expressions from PCL-based scaffold groups (p>0.05) were found, suggesting slight advantages over the sham group (no scaffold implantation). PCL/TCP scaffold group also expressed EBA to a higher degree (p>0.05) than PCL scaffolds. Importantly, higher capillary count and area as early as 1 week postimplantation suggested lowered ischemia from the PCL/TCP scaffold group as compared with PCL and sham. Evaluation of interlukin-1β expression suggested that the PCL and PCL/TCP scaffolds did not cause prolonged inflammation. BBB transport selectivity was evaluated by the expression of aquaporin-4 (AQP-4). Attenuated expression of AQP-4 in the PCL/TCP group (p<0.05) suggested that PCL/TCP scaffolds altered BBB selectivity to a lower degree as compared with sham and PCL groups, pointing to potential clinical implications in reducing cerebral edema. Taken together, the responses of PCL-based scaffolds with brain tissue suggested safety, and encourages further preclinical evaluation in PBI management with these scaffolds.
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Maturana LG, Pierucci A, Simões GF, Oliveira ALRD, Duek EADR. Estudo das células Neuro2A sobre os biomateriais PCL e PLLA. POLIMEROS 2014. [DOI: 10.1590/0104-1428.1555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Os biomateriais poli L-ácido lático (PLLA) e o poli caprolactona (PCL) são os polímeros mais estudadas na área dos materiais bioreabsorvíveis. Dentre as suas principais características que contribuem para a interação celular, temos a especificidade química da superfície, elétrica, hidrofobicidade e topografia. Ainda, observa-se o tempo de degradação, porosidade, biocompatibilidade com o tecido biológico, bem como, a confecção com as mais variadas formas e dimensões. Já a prática da cultura celular, tem como objetivo estudar a adesão, migração, diferenciação e a proliferação celular utilizando-se um determinado material ou substância. Contudo, poucos trabalhos utilizando os biomateriais ora supracitados e a aplicação em células neuro2A foram realizados. Sabe-se que este tipo celular é derivado de células embrionárias da crista neural, as quais originam em neurônios simpáticos e apresentam como característica a imortalidade, portanto, são excelentes modelos em ensaios in vitro. Nesse sentido, o presente estudo avalia a adesão e a proliferação desta linhagem celular sobre os biopolímeros poli caprolactona (PCL) e poli L-ácido lático (PLLA).
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Affiliation(s)
| | - Amauri Pierucci
- Universidade Federal dos Vales do Jequitinhonha e Mucuri - UFVJM
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38
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Clausen F, Lindh T, Salimi S, Erlandsson A. Combination of growth factor treatment and scaffold deposition following traumatic brain injury has only a temporary effect on regeneration. Brain Res 2014; 1588:37-46. [DOI: 10.1016/j.brainres.2014.08.043] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 08/14/2014] [Accepted: 08/16/2014] [Indexed: 01/01/2023]
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Wischke C, Weigel J, Bulavina L, Lendlein A. Sustained release carrier for adenosine triphosphate as signaling molecule. J Control Release 2014; 195:86-91. [PMID: 25087974 DOI: 10.1016/j.jconrel.2014.07.047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Revised: 07/15/2014] [Accepted: 07/24/2014] [Indexed: 01/15/2023]
Abstract
Adenosine triphosphate (ATP) is a molecule with a fascinating variety of intracellular and extracellular biological functions that go far beyond energy metabolism. Due to its limited passive diffusion through biological membranes, controlled release systems may allow to interact with ATP-mediated extracellular processes. In this study, two release systems were explored to evaluate the capacity for either long-term or short-term release: (i) Poly[(rac-lactide)-co-glycolide] (PLGA) implant rods were capable of ATP release over days to weeks, depending on the PLGA molecular weight and end-group capping, but were also associated with partial hydrolytic degradation of ATP to ADP and AMP, but not adenosine. (ii) Thermosensitive methylcellulose hydrogels with a gelation occurring at body temperature allowed combining adjustable loading levels and the capacity for injection, with injection forces less than 50N even for small 27G needles. Finally, a first in vitro study illustrated purinergic-triggered response of primary murine microglia to ATP released from hydrogels, demonstrating the potential relevance for biomedical applications.
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Affiliation(s)
- Christian Wischke
- Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Kantstr. 55, Teltow, Germany; Berlin-Brandenburg Center for Regenerative Therapies, Kantstr. 55, Teltow, Germany.
| | - Judith Weigel
- Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Kantstr. 55, Teltow, Germany; Berlin-Brandenburg Center for Regenerative Therapies, Kantstr. 55, Teltow, Germany
| | - Larisa Bulavina
- Cellular Neuroscience, Max-Delbrück-Center for Molecular Medicine, Robert-Rössle-Strasse 10, Berlin, Germany
| | - Andreas Lendlein
- Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Kantstr. 55, Teltow, Germany; Berlin-Brandenburg Center for Regenerative Therapies, Kantstr. 55, Teltow, Germany.
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40
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Skop NB, Calderon F, Cho CH, Gandhi CD, Levison SW. Improvements in biomaterial matrices for neural precursor cell transplantation. MOLECULAR AND CELLULAR THERAPIES 2014; 2:19. [PMID: 26056586 PMCID: PMC4452047 DOI: 10.1186/2052-8426-2-19] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 06/05/2014] [Indexed: 12/24/2022]
Abstract
Progress is being made in developing neuroprotective strategies for traumatic brain injuries; however, there will never be a therapy that will fully preserve neurons that are injured from moderate to severe head injuries. Therefore, to restore neurological function, regenerative strategies will be required. Given the limited regenerative capacity of the resident neural precursors of the CNS, many investigators have evaluated the regenerative potential of transplanted precursors. Unfortunately, these precursors do not thrive when engrafted without a biomaterial scaffold. In this article we review the types of natural and synthetic materials that are being used in brain tissue engineering applications for traumatic brain injury and stroke. We also analyze modifications of the scaffolds including immobilizing drugs, growth factors and extracellular matrix molecules to improve CNS regeneration and functional recovery. We conclude with a discussion of some of the challenges that remain to be solved towards repairing and regenerating the brain.
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Affiliation(s)
- Nolan B Skop
- Department of Neurology & Neurosciences, Rutgers University-New Jersey Medical School, NJMS-Cancer Center, H-1226, 205 South Orange Ave., Newark, NJ 07103 USA ; Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ 07102 USA
| | - Frances Calderon
- Department of Neurology & Neurosciences, Rutgers University-New Jersey Medical School, NJMS-Cancer Center, H-1226, 205 South Orange Ave., Newark, NJ 07103 USA
| | - Cheul H Cho
- Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ 07102 USA
| | - Chirag D Gandhi
- Department of Neurology & Neurosciences, Rutgers University-New Jersey Medical School, NJMS-Cancer Center, H-1226, 205 South Orange Ave., Newark, NJ 07103 USA ; Department of Neurological Surgery, Rutgers University-New Jersey Medical School, New Jersey Medical School, Newark, NJ 07103 USA
| | - Steven W Levison
- Department of Neurology & Neurosciences, Rutgers University-New Jersey Medical School, NJMS-Cancer Center, H-1226, 205 South Orange Ave., Newark, NJ 07103 USA
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Zopf DA, Flanagan CL, Wheeler M, Hollister SJ, Green GE. Treatment of severe porcine tracheomalacia with a 3-dimensionally printed, bioresorbable, external airway splint. JAMA Otolaryngol Head Neck Surg 2014; 140:66-71. [PMID: 24232078 DOI: 10.1001/jamaoto.2013.5644] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
IMPORTANCE The study demonstrates use of a novel intervention for severe tracheobronchomalacia (TBM). OBJECTIVE To test a novel, 3-dimensionally (3D) printed, bioresorbable airway splint for efficacy in extending survival in a porcine model of severe, life-threatening TBM. DESIGN AND PARTICIPANTS A randomized, prospective animal trial was used to evaluate an external airway splint as treatment of severe, life-threatening TBM in a multi-institutional, multidisciplinary collaboration between a biomedical engineering department and an academic animal surgery center. Six 2-month-old Yorkshire pigs underwent tracheal cartilage division and inner tracheal lumen dissociation and were randomly assigned to splint treatment (n = 3) or control groups (n = 3). Two additional pigs had the splint placed over their normal trachea. INTERVENTIONS A 3D-printed, bioresorbable airway splint was assessed in a porcine animal model of life-threatening TBM. The open-cylindrical, bellow-shaped, porous polycaprolactone splint was placed externally and designed to suspend the underlying collapsed airway. Two additional animals were splinted without model creation. MAIN OUTCOMES AND MEASURES The observer-based Westley Clinical Croup Scale was used to assess the clinical condition of animals postoperatively. Animal survival time was noted. RESULTS Complete or nearly complete tracheal lumen collapse was observed in each animal, with resolution of symptoms in all of the experimental animals after splint placement. Using our severe TBM animal model, survival was significantly longer in the experimental group receiving the airway splint after model creation than in the control group (P = .0495). CONCLUSIONS AND RELEVANCE A multidisciplinary effort producing a computer-aided designed, computer-aided manufactured bioresorbable tracheobronchial splint was tested in a porcine model of severe TBM and was found to extend survival time. Mortality in the splinted group was ascribed to the TBM model based on the lack of respiratory distress in splinted pigs, long-term survival in animals implanted with the splint without TBM, and necropsy findings.
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Affiliation(s)
- David A Zopf
- Division of Pediatric Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, University of Michigan, Ann Arbor
| | - Colleen L Flanagan
- Departments of Biomedical Engineering, Mechanical Engineering, and Surgery, University of Michigan, Ann Arbor
| | - Matthew Wheeler
- Institute for Genomic Biology and Department of Animal Sciences, University of Illinois, Urbana-Champaign
| | - Scott J Hollister
- Departments of Biomedical Engineering, Mechanical Engineering, and Surgery, University of Michigan, Ann Arbor
| | - Glenn E Green
- Division of Pediatric Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, University of Michigan, Ann Arbor
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Choy DKS, Nga VDW, Lim J, Lu J, Chou N, Yeo TT, Teoh SH. Brain tissue interaction with three-dimensional, honeycomb polycaprolactone-based scaffolds designed for cranial reconstruction following traumatic brain injury. Tissue Eng Part A 2013; 19:2382-9. [PMID: 23691928 DOI: 10.1089/ten.tea.2012.0733] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Following traumatic brain injury (TBI), resultant voids are unable to support injections of suspension treatments, leading to ineffective healing. Moreover, without a structure to support the large defect, the defect site suffers from mechanical instability, which may impair the healing process. Therefore, having a delivery vehicle that can temporarily fill and provide mechanical support to the defect site may alleviate the healing process. In this work, we reported for the first time, the inflammatory response of brain tissue with polycaprolactone (PCL) and PCL-tricalcium phosphate (TCP) scaffolds designed and fabricated for cranial reconstruction. After cranial defects were created in Sprague-Dawley rats, PCL and PCL-TCP scaffolds were implanted for a period of 1 week and 1 month. Following histology and immunofluorescence staining with the ionized calcium binding adaptor molecule-1 (IBA-1), glial fibrillary acidic protein (GFAP), nestin, and neuronal nuclei (NeuN), results indicated that IBA-1-positive activated microglia were observed across all groups, and declined significantly by 1 month (p<0.05). Interestingly, IBA-1-positive microglia were significantly fewer in the PCL-TCP group (p<0.05), suggesting a relatively milder inflammatory response. A decrease in the number of GFAP-positive cells among all groups over time (>29%) was also observed. Initially, astrocyte hypertrophy was observed proximal to the TBI site (55% in PCL and PCL-TCP groups, 75% in control groups), but it subsided by 1 month. Proximal to the TBI site, nestin immunoreactivity was intense during week 1, and which reduced by 1 month across all groups. NeuN-positive neurons were shrunken proximal to the TBI site (<0.9 mm), 32% smaller in the PCL-TCP group and 27% smaller in the PCL group. Based on above data indicating the comparatively milder, initial inflammatory response of brain tissue to PCL-TCP scaffolds, it is suggested that PCL-TCP scaffolds have notable clinical advantages as compared to PCL scaffolds.
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Affiliation(s)
- David Kim Seng Choy
- 1 Division of Neurosurgery, National University Hospital Singapore , Singapore, Singapore
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Béduer A, Vaysse L, Loubinoux I, Vieu C. [Micro/nano-engineering to control growth of neuronal cells and tissue engineering applied to the central nervous system]. Biol Aujourdhui 2013; 207:291-307. [PMID: 24594577 DOI: 10.1051/jbio/2013019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Indexed: 11/14/2022]
Abstract
Central nervous system pathologies are often characterized by the loss of cell populations. A promising therapy now being developed consists in using bioactive materials, associating grafted cells to biopolymers which provide a scaffold for the in vitro building of new tissues, to be implanted in vivo. In the present article, the state of the art of this field, at crossroads between microtechnology and neuroscience, is described in detail; thereafter our own approach and results about interactions between adult human neural stem cells and microstructured polymers are summarized and discussed. In a second part, some central nervous system repair strategies, based on cerebral tissue engineering, are presented. We will report the main results of our studies to work out and characterize in vivo a cerebral bioprosthesis.
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Affiliation(s)
- Amélie Béduer
- LAAS, CNRS & Université de Toulouse (UPS, INSA, IAES), 7 avenue du Colonel Roche, 31077 Toulouse, France
| | - Laurence Vaysse
- INSERM, Imagerie Cérébrale et Handicaps Neurologiques UMR 825, 31059 Toulouse, France
| | - Isabelle Loubinoux
- INSERM, Imagerie Cérébrale et Handicaps Neurologiques UMR 825, 31059 Toulouse, France
| | - Christophe Vieu
- LAAS, CNRS & Université de Toulouse (UPS, INSA, IAES), 7 avenue du Colonel Roche, 31077 Toulouse, France
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44
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One-Dimensional Migration of Olfactory Ensheathing Cells on Synthetic Materials: Experimental and Numerical Characterization. Cell Biochem Biophys 2012; 65:21-36. [DOI: 10.1007/s12013-012-9399-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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45
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Elias PZ, Spector M. Characterization of a Bilateral Penetrating Brain Injury in Rats and Evaluation of a Collagen Biomaterial for Potential Treatment. J Neurotrauma 2012; 29:2086-102. [DOI: 10.1089/neu.2011.2181] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Paul Z. Elias
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts
- Tissue Engineering Laboratories, VA Boston Healthcare System, Boston, Massachusetts
| | - Myron Spector
- Tissue Engineering Laboratories, VA Boston Healthcare System, Boston, Massachusetts
- Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
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Elias PZ, Spector M. Implantation of a collagen scaffold seeded with adult rat hippocampal progenitors in a rat model of penetrating brain injury. J Neurosci Methods 2012; 209:199-211. [PMID: 22698665 DOI: 10.1016/j.jneumeth.2012.06.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2012] [Revised: 04/24/2012] [Accepted: 06/05/2012] [Indexed: 10/28/2022]
Abstract
Penetrating brain injury (PBI) is a complex central nervous system injury in which mechanical damage to brain parenchyma results in hemorrhage, ischemia, broad areas of necrosis, and eventually cavitation. The permanent loss of brain tissue affords the possibility of treatment using a biomaterial scaffold to fill the lesion site and potentially deliver pharmacological or cellular therapeutic agents. The administration of cellular therapy may be of benefit in both mitigating the secondary injury process and promoting regeneration through replacement of certain cell populations. This study investigated the survival and differentiation of adult rat hippocampal neural progenitor cells delivered by a collagen scaffold in a rat model of PBI. The cell-scaffold construct was implanted 1 week after injury and was observed to remain intact with open pores upon analysis 4 weeks later. Implanted neural progenitors were found to have survived within the scaffold, and also to have migrated into the surrounding brain. Differentiated phenotypes included astrocytes, oligodendrocytes, vascular endothelial cells, and possibly macrophages. The demonstrated multipotency of this cell population in vivo in the context of traumatic brain injury has implications for regenerative therapies, but additional stimulation appears necessary to promote neuronal differentiation outside normally neurogenic regions.
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Affiliation(s)
- Paul Z Elias
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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Yang TL, Hsiao YC, Young TH. COMPARISON OF PLGA, PCL, AND CHITOSAN IN SALIVARY GLAND BRANCHING MORPHOGENESIS. BIOMEDICAL ENGINEERING-APPLICATIONS BASIS COMMUNICATIONS 2012. [DOI: 10.4015/s1016237208000908] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Branching morphogenesis is a fundamental morphogenetic process in generating glandular tissues. Although the mechanism of branching morphogenesis has been well-explored in the salivary gland development, its interaction with different biodegradable materials has never been investigated. For the purpose of salivary gland regeneration, recapitulation of morphogenetic processes on biodegradable materials might be requisite. Toward this aim, biodegradable biomaterials including poly-lactic-co-glycolic acid (PLGA), poly-epsilon-caprolactone (PCL), and chitosan were examined in the submandibular gland (SMG) culture systems to elucidate their possible impact on salivary morphogenesis. It was found that when SMG explants were cultured on PLGA and PCL, the explants failed to form well-developed branching phenotypes with limited cell migration (5.6 ± 8.8 μm; 10.0 ± 14.1 μm) and decreasing cell viability (56.9% ± 12.5%; 50.3% ± 8.1%). On the contrary, explants cultured on chitosan showed well-developed branches, which were superior in number to those on the control substrata, without any alteration of the morphogenetic phenotypes. Furthermore, the increased cell migration (267.8 ± 45.2 μm) and explants viability (146.8% ± 18.4%) along with the greater deposition of type III collagen, altogether account for better SMG morphogenesis on chitosan. According to the results, it was found that branching morphogenesis of SMG was affected by different biodegradable materials. Chitosan might be an appropriate biodegradable material for salivary morphogenesis, and has applicable potential in the regeneration of salivary tissue.
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Affiliation(s)
- Tsung-Lin Yang
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei, Taiwan
- Department of Otolaryngology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
- Department of Otolaryngology, Yun-Lin Branch of National Taiwan University Hospital, Douliu, Yunlin, Taiwan
| | - Ya-Chuan Hsiao
- Department of Ophthalmology, Zhongxing Branch, Taipei City Hospital, Taipei, Taiwan
| | - Tai-Horng Young
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei, Taiwan
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Song R, Liu F, Yang J, Yao L, He L, Qin B. Novel pH-Sensitive Lactic Acid Oligomer Grafted Chitosan Hydrogel for Controlled Drug Release. J MACROMOL SCI B 2011. [DOI: 10.1080/00222348.2010.503170] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Rui Song
- a Key Laboratory of Surface and Interface Sciences of Henan Provincial , Zhengzhou University of Light Industry , Zhengzhou , China
| | - Fujun Liu
- a Key Laboratory of Surface and Interface Sciences of Henan Provincial , Zhengzhou University of Light Industry , Zhengzhou , China
| | - Jie Yang
- b College of Chemistry and Chemical Engineering , Graduate University of Chinese Academy of Sciences , Beijing , China
| | - Lu Yao
- a Key Laboratory of Surface and Interface Sciences of Henan Provincial , Zhengzhou University of Light Industry , Zhengzhou , China
| | - Linghao He
- a Key Laboratory of Surface and Interface Sciences of Henan Provincial , Zhengzhou University of Light Industry , Zhengzhou , China
| | - Bing Qin
- b College of Chemistry and Chemical Engineering , Graduate University of Chinese Academy of Sciences , Beijing , China
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Lewitus DY, Smith KL, Shain W, Bolikal D, Kohn J. The fate of ultrafast degrading polymeric implants in the brain. Biomaterials 2011; 32:5543-50. [PMID: 21609850 DOI: 10.1016/j.biomaterials.2011.04.052] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Accepted: 04/20/2011] [Indexed: 12/30/2022]
Abstract
We have recently reported on an ultrafast degrading tyrosine-derived terpolymer that degrades and resorbs within hours, and is suitable for use in cortical neural prosthetic applications. Here we further characterize this polymer, and describe a new tyrosine-derived fast degrading terpolymer in which the poly(ethylene glycol) (PEG) is replaced by poly(trimethylene carbonate) (PTMC). This PTMC containing terpolymer showed similar degradation characteristics but its resorption was negligible in the same period. Thus, changes in the polymer chemistry allowed for the development of two ultrafast degrading polymers with distinct difference in resorption properties. The in vivo tissue response to both polymers used as intraparenchymal cortical devices was compared to poly(lactic-co-glycolic acid) (PLGA). Slow resorbing, indwelling implant resulted in continuous glial activation and loss of neural tissue. In contrast, the fast degrading tyrosine-derived terpolymer that is also fast resorbing, significantly reduced both the glial response in the implantation site and the neuronal exclusion zone. Such polymers allow for brain tissue recovery, thus render them suitable for neural interfacing applications.
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Affiliation(s)
- Dan Y Lewitus
- New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey, 145 Bevier Rd., Piscataway, NJ 08854, USA.
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Development of complete thoracic spinal cord transection model in rats for delayed transplantation of stem cells. Spine (Phila Pa 1976) 2011; 36:E155-63. [PMID: 21124262 DOI: 10.1097/brs.0b013e3181d8b92a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN In vivo study of a rat spinal cord injury model. OBJECTIVES To develop complete transection model of thoracic spinal cord using a polymer sheet and a microtube relevant for delayed transplantation of stem cells. SUMMARY OF BACKGROUND DATA Stem cell transplantation for the regeneration of spinal cord injuries has used animal models. However, current models suffer from inflammation and leakage, which lessens their usefulness in studying delayed stem cell transplantation. METHODS Thoracic spinal cord at T9 level of adult Sprague-Dawley rats was exposed and a 50:50 sheet of poly(D,L-lactic-coglycolic acid) was inserted, exposed spinal cord was completely transected, and collagen was filled between the gap between the proximal and distal stumps of transected spinal cord. A microtube was placed and fixed between the polymer surfaces facing each other. Behavior testing, magnetic resonance imaging, and myelography were performed to characterize the new complete transection with a gap formation and polymer insertion (GAP) model and to compare the GAP model with the control models. Human mesenchymal stem cells (hMSCs) were transplanted into 3 models and immunohistochemistry and western blot were performed. RESULTS The inserted poly(D,L-lactic-coglycolic acid) sheet was completely disappeared 10 weeks after operation, but the inserted microtube remained firmly fixed in its original position. Myelography of the GAP model showed no leakage of contrast medium around the injured spinal cord, whereas magnetic resonance imaging of the severe contusion and simple transection models showed some leakage of contrast medium. Immunohistochemistry and western blot after hMSCs transplantation indicated that transplanted hMSCs survived and migrated well in the GAP model, and the deposition of inflammatory cells in GAP model was less than a simple transection model or severe contusion model. CONCLUSION The developed GAP model is more relevant for delayed transplantation of stem cells for the study of regeneration of spinal cord injury of rats.
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