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Keklikian A, de Barros NR, Rashad A, Chen Y, Tan J, Sheng R, Sun D, Liu H, Thankam FG. Chitosan-Polyethylene Glycol Inspired Polyelectrolyte Complex Hydrogel Templates Favoring NEO-Tissue Formation for Cardiac Tissue Engineering. Gels 2024; 10:46. [PMID: 38247769 PMCID: PMC10815274 DOI: 10.3390/gels10010046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 12/22/2023] [Accepted: 12/27/2023] [Indexed: 01/23/2024] Open
Abstract
Neo-tissue formation and host tissue regeneration determine the success of cardiac tissue engineering where functional hydrogel scaffolds act as cardiac (extracellular matrix) ECM mimic. Translationally, the hydrogel templates promoting neo-cardiac tissue formation are currently limited; however, they are highly demanding in cardiac tissue engineering. The current study focused on the development of a panel of four chitosan-based polyelectrolyte hydrogels as cardiac scaffolds facilitating neo-cardiac tissue formation to promote cardiac regeneration. Chitosan-PEG (CP), gelatin-chitosan-PEG (GCP), hyaluronic acid-chitosan-PEG (HACP), and combined CP (CoCP) polyelectrolyte hydrogels were engineered by solvent casting and assessed for physiochemical, thermal, electrical, biodegradable, mechanical, and biological properties. The CP, GCP, HACP, and CoCP hydrogels exhibited excellent porosity (4.24 ± 0.18, 13.089 ± 1.13, 12.53 ± 1.30 and 15.88 ± 1.10 for CP, GCP, HACP and CoCP, respectively), water profile, mechanical strength, and amphiphilicity suitable for cardiac tissue engineering. The hydrogels were hemocompatible as evident from the negligible hemolysis and RBC aggregation and increased adsorption of plasma albumin. The hydrogels were cytocompatible as evident from the increased viability by MTT (>94% for all the four hydrogels) assay and direct contact assay. Also, the hydrogels supported the adhesion, growth, spreading, and proliferation of H9c2 cells as unveiled by rhodamine staining. The hydrogels promoted neo-tissue formation that was proven using rat and swine myocardial tissue explant culture. Compared to GCP and CoCP, CP and HACP were superior owing to the cell viability, hemocompatibility, and conductance, resulting in the highest degree of cytoskeletal organization and neo-tissue formation. The physiochemical and biological performance of these hydrogels supported neo-cardiac tissue formation. Overall, the CP, GCP, HACP, and CoCP hydrogel systems promise novel translational opportunities in regenerative cardiology.
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Affiliation(s)
- Angelo Keklikian
- Department of Translational Research, College of Osteopathic Medicine of the Pacific and Graduate College of Biomedical Sciences, Western University of Health Sciences, Pomona, CA 91766, USA;
| | - Natan Roberto de Barros
- Terasaki Institute for Biomedical Innovation (TIBI), Los Angeles, CA 90064, USA; (N.R.d.B.); (A.R.)
| | - Ahmad Rashad
- Terasaki Institute for Biomedical Innovation (TIBI), Los Angeles, CA 90064, USA; (N.R.d.B.); (A.R.)
| | - Yiqing Chen
- Department of Bioengineering, University of California, Riverside, CA 92521, USA; (Y.C.); (R.S.); (D.S.); (H.L.)
| | - Jinrui Tan
- Department of Bioengineering, University of California, Riverside, CA 92521, USA; (Y.C.); (R.S.); (D.S.); (H.L.)
| | - Ruoyu Sheng
- Department of Bioengineering, University of California, Riverside, CA 92521, USA; (Y.C.); (R.S.); (D.S.); (H.L.)
| | - Dongwei Sun
- Department of Bioengineering, University of California, Riverside, CA 92521, USA; (Y.C.); (R.S.); (D.S.); (H.L.)
| | - Huinan Liu
- Department of Bioengineering, University of California, Riverside, CA 92521, USA; (Y.C.); (R.S.); (D.S.); (H.L.)
| | - Finosh G. Thankam
- Department of Translational Research, College of Osteopathic Medicine of the Pacific and Graduate College of Biomedical Sciences, Western University of Health Sciences, Pomona, CA 91766, USA;
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Sedighim S, Chen Y, Xu C, Mohindra R, Liu H, Agrawal DK, Thankam FG. Carboxymethyl cellulose-alginate interpenetrating hydroxy ethyl methacrylate crosslinked polyvinyl alcohol reinforced hybrid hydrogel templates with improved biological performance for cardiac tissue engineering. Biotechnol Bioeng 2023; 120:819-835. [PMID: 36412070 PMCID: PMC9931685 DOI: 10.1002/bit.28291] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 10/31/2022] [Accepted: 11/18/2022] [Indexed: 11/23/2022]
Abstract
Cardiac tissue engineering is an emerging approach for cardiac regeneration utilizing the inherent healing responses elicited by the surviving heart using biomaterial templates. In this study, we aimed to develop hydrogel scaffolds for cardiac tissue regeneration following myocardial infarction (MI). Two superabsorbent hydrogels, CAHA2A and CAHA2AP, were developed employing interpenetration chemistry. CAHA2A was constituted with alginate, carboxymethyl cellulose, (hydroxyethyl) methacrylate, and acrylic acid, where CAHA2AP was prepared by interpenetrated CAHA2A with polyvinyl alcohol. Both hydrogels displayed superior physiochemical characteristics, as determined by attenuated total reflection infrared spectroscopy spectral analysis, differential scanning calorimetry measurements, tensile testing, contact angle, water profiling, dye release, and conductivity. In vitro degradation of the hydrogels displayed acceptable weight composure and pH changes. Both hydrogels were hemocompatible, and biocompatible as evidenced by direct contact and MTT assays. The hydrogels promoted anterograde and retrograde migration as determined by the z-stack analysis using H9c2 cells grown with both gels. Additionally, the coculture of the hydrogels with swine epicardial adipose tissue cells and cardiac fibroblasts resulted in synchronous growth without any toxicity. Also, both hydrogels facilitated the production of extracellular matrix by the H9c2 cells. Overall, the findings support an appreciable in vitro performance of both hydrogels for cardiac tissue engineering applications.
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Affiliation(s)
- Sharona Sedighim
- Department of Translational Research, Western University of Health Sciences, Pomona, California 91766, USA
| | - Yiqing Chen
- Department of Bioengineering, University of California, Riverside, CA 92521, USA
| | - Changlu Xu
- Department of Bioengineering, University of California, Riverside, CA 92521, USA
| | - Rohit Mohindra
- Department of Translational Research, Western University of Health Sciences, Pomona, California 91766, USA
| | - Huinan Liu
- Department of Bioengineering, University of California, Riverside, CA 92521, USA
| | - Devendra K. Agrawal
- Department of Translational Research, Western University of Health Sciences, Pomona, California 91766, USA
| | - Finosh G. Thankam
- Department of Translational Research, Western University of Health Sciences, Pomona, California 91766, USA
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Chenicheri S, Ramachandran R, Rajamanikam U. Antimicrobial effects of hydroxyapatite mosaicked polyvinyl alcohol-alginate semi-interpenetrating hydrogel-loaded with ethanolic extract of Glycyrrhiza glabra against oral pathogens. Prog Biomater 2022; 11:373-383. [PMID: 35969367 DOI: 10.1007/s40204-022-00199-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 07/27/2022] [Indexed: 11/25/2022] Open
Abstract
Glycyrrhiza glabra (GG) elicits protective effects against periodontal diseases. However, the sustained bioavailability of GG extract at therapeutic concentration warrants ideal delivery vehicles. Present study has focused on the design, fabrication, and evaluations of ethanolic-crude extract of GG-loaded semi-interpenetrating network (semi-IPN) hydrogel (HAAPS-GG) using alginic acid and polyvinyl alcohol (PVA) hydrogel mosaicked with HA for periodontal regeneration. The study has examined the performance of the hydrogel against the selected oral pathogens S. mutans, E. faecalis, L. acidophilus and C. albicans. HAAPS-GG was successfully fabricated and the surface functional groups were confirmed by attenuated total reflectance-infrared (ATR-IR) spectroscopy. HAAPS-GG displayed interconnecting pores, hydrophilicity and excellent water profile contributing to the biocompatibility as evident from direct contact and MTT assay in L929 fibroblasts. The hydrogel was mechanically stable and was immunocompatible owing to the relatively decreased levels of pro-inflammatory mediators COX2, 5LPO, iNOS and MPO in RAW 264.7 macrophages. In addition, the transcript analysis on RAW 264.7 revealed the down-regulation of inflammatory transcription factor NF-κβ and the pro-inflammatory cytokine TNF-α. Importantly, HAAPS-GG arrested the progression of periodontal pathogens predominantly S. mutans, and C. albicans as evident by disc diffusion assay, MTT assay and confocal microscopy. Overall, the HAAPS-GG system offers promising translational avenues in periodontal regeneration.
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Affiliation(s)
- Smitha Chenicheri
- Department of Microbiology, PMS College of Dental Science and Research, Thiruvanathapuram, 695028, Kerala, India.
- Biomaterial Divisions, Centre for Research in Molecular and Applied Sciences (CRMAS), Thiruvanathapuram, 695006, Kerala, India.
| | - Rajesh Ramachandran
- Biomaterial Divisions, Centre for Research in Molecular and Applied Sciences (CRMAS), Thiruvanathapuram, 695006, Kerala, India
| | - Usha Rajamanikam
- Karpagam Academy for Higher Education, Coimbatore, 641021, Tamilnadu, India
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Agrawal DK, Thankam FG. Commentary: Evidence-based human stem cell therapy for myocardial healing: Miles to go. JTCVS OPEN 2021; 8:144-146. [PMID: 36004196 PMCID: PMC9390384 DOI: 10.1016/j.xjon.2021.06.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 06/24/2021] [Accepted: 06/29/2021] [Indexed: 11/28/2022]
Affiliation(s)
- Devendra K. Agrawal
- Address for reprints: Devendra K. Agrawal, PhD, MBA, MS, Department of Translational Research, Western University of Health Sciences, 309 E Second St, Pomona, CA 91766-1854.
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Thankam FG, Diaz C, Chandra I, Link J, Newton J, Dilisio MF, Agrawal DK. Hybrid interpenetrating hydrogel network favoring the bidirectional migration of tenocytes for rotator cuff tendon regeneration. J Biomed Mater Res B Appl Biomater 2021; 110:467-477. [PMID: 34342931 DOI: 10.1002/jbm.b.34924] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 06/26/2021] [Accepted: 07/25/2021] [Indexed: 02/02/2023]
Abstract
Replenishment of tenocytes to the injury site is an ideal strategy to improve healing response and accelerate the tendon ECM regeneration. The present study focused on the synthesis and characterization of a hybrid hydrogel scaffold system poly(propylene-fumarate)-alginate-polyvinyl alcohol-acrylic acid (PAPA) using poly(propylene-fumarate) (PPF), alginate, polyvinyl alcohol (PVA) and acrylic acid and the in vitro investigation of bidirectional mobility of swine shoulder tenocytes (SST) for its potential application in rotator-cuff tendon regeneration. IR analysis revealed the presence of alginate, PPF and PVA segments on the surface, SEM and AFM analyses revealed the porous and nano-topographical features of PAPA, respectively, swelling was 712.6 ± 84.21% with the EWC (%) of 87.59 ± 1.26 having the diffusional exponent and swelling constant 0.551 and 1.8, respectively. PAPA was biodegradable, cytocompatible and supported long-term survival of SSTs. SEM imaging revealed the adhesion, colonization, and sheet formation of SSTs within the PAPA hydrogel network. The SSTs seeded on the PAPA scaffolds were peculiar for their bidirectional migration as the anterograde movement was completed in 9 days whereas the retrograde infiltration occurred up to the depth of 198 μm. These findings suggest the promising translational potential of PAPA scaffold system in the management of rotator cuff tendon injury.
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Affiliation(s)
- Finosh G Thankam
- Department of Translational Research, Western University of Health Sciences, Pomona, California, USA
| | - Connor Diaz
- Departments of Clinical & Translational Science and Orthopedic Surgery, Creighton University School of Medicine, Omaha, Nebraska, USA
| | - Isaiah Chandra
- Departments of Clinical & Translational Science and Orthopedic Surgery, Creighton University School of Medicine, Omaha, Nebraska, USA
| | - Josh Link
- Departments of Clinical & Translational Science and Orthopedic Surgery, Creighton University School of Medicine, Omaha, Nebraska, USA
| | - Joseph Newton
- Departments of Clinical & Translational Science and Orthopedic Surgery, Creighton University School of Medicine, Omaha, Nebraska, USA
| | - Matthew F Dilisio
- Departments of Clinical & Translational Science and Orthopedic Surgery, Creighton University School of Medicine, Omaha, Nebraska, USA
| | - Devendra K Agrawal
- Department of Translational Research, Western University of Health Sciences, Pomona, California, USA
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Li Q, Gong S, Yao W, Yu Y, Liu C, Wang R, Pan H, Wei M. PEG-interpenetrated genipin-crosslinked dual-sensitive hydrogel/nanostructured lipid carrier compound formulation for topical drug administration. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2021; 49:345-353. [PMID: 33784224 DOI: 10.1080/21691401.2021.1879104] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
PEG-interpenetrated dual-sensitive hydrogels that load nano lipid carrier (NLC) were researched and developed for topical drug administration. Natural antioxidant α-lipoic acid (ALA) was selected as our model drug. The α-lipoic acid (ALA) nano lipid carrier was successfully prepared by hot melt emulsification and ultrasonic dispersion method, and the physicochemical properties of the nano lipid carrier were investigated, including morphology, particle distribution, polydispersity coefficient, zeta potential and encapsulation efficiency. Carboxymethyl chitosan and poloxamer 407 contributed to pH- and temperature-sensitive properties in the hydrogel, respectively. Natural non-toxic cross-linking agent genipin reacted with carboxymethyl chitosan to form the hydrogel. Poly ethylene glycol (PEG), a polymer compound with good water solubility and biocompatibility, interpenetrated the hydrogel and influenced the mechanical strength and drug release behaviour. FI-IR test verified the successful synthesis of the hydrogel. The rheological parameters indicated that the mechanical strength of the hydrogel was positively correlated with the amount of PEG, and the in vitro dissolution profiles demonstrated that the increasement of PEG could accelerate the drug release rate. The compatibility of the drug delivery system was verified with cells and mice model. Topical delivery of ALA in solution, NLC and NLC-gel was investigated in-vitro.
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Affiliation(s)
- Qijun Li
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang, China
| | - Shiqiang Gong
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang, China
| | - Weifan Yao
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang, China
| | - Yibin Yu
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
| | - Chao Liu
- Liaoning Medical Diagnosis and Treatment Center, Shenyang, China
| | - Renjun Wang
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang, China
| | - Hao Pan
- School of Pharmacy, Liaoning University, Shenyang, China
| | - Minjie Wei
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang, China
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Abasi S, Davis R, Podstawczyk DA, Guiseppi-Elie A. Distribution of water states within Poly(HEMA-co-HPMA)-based hydrogels. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121978] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Yao Y, Liao W, Yu R, Du Y, Zhang T, Peng Q. Potentials of combining nanomaterials and stem cell therapy in myocardial repair. Nanomedicine (Lond) 2018; 13:1623-1638. [PMID: 30028249 DOI: 10.2217/nnm-2018-0013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Cardiac diseases have become the leading cause of death worldwide. Developing efficient strategies to treat such diseases is of great urgency. Stem cell-based regeneration medicine offers a novel approach for heart repair. However, low retention and poor survival rate of engrafted cells limit its applications. Nanomaterials have shown great potentials in addressing above issues due to nanoparticles-bio interactions. Therefore, combining nanomaterials and stem cell therapy is of great interest and significance for heart repair. Herein, we provide a comprehensive understanding of the applications of four types of nanomaterials (nanogels, polymeric nanomaterials, inorganic nanomaterials and exosomes) in stem cell therapy for myocardial repair. In addition, we launch an initial discussion on current problems and more importantly, possible solutions for myocardial repair.
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Affiliation(s)
- Yang Yao
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.,Department of Oral Implant Center, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Wen Liao
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.,Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Ruichao Yu
- Department of Pathophysiology & Molecular Pharmacology, Joslin Diabetes Center, Harvard Medical School, 1 Joslin Place, Boston, MA 02215, USA
| | - Yu Du
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Ting Zhang
- Department of Pharmacy, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Qiang Peng
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
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10
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Gun'ko VM, Savina IN, Mikhalovsky SV. Properties of Water Bound in Hydrogels. Gels 2017; 3:E37. [PMID: 30920534 PMCID: PMC6318700 DOI: 10.3390/gels3040037] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 10/10/2017] [Accepted: 10/10/2017] [Indexed: 01/23/2023] Open
Abstract
In this review, the importance of water in hydrogel (HG) properties and structure is analyzed. A variety of methods such as ¹H NMR (nuclear magnetic resonance), DSC (differential scanning calorimetry), XRD (X-ray powder diffraction), dielectric relaxation spectroscopy, thermally stimulated depolarization current, quasi-elastic neutron scattering, rheometry, diffusion, adsorption, infrared spectroscopy are used to study water in HG. The state of HG water is rather non-uniform. According to thermodynamic features of water in HG, some of it is non-freezing and strongly bound, another fraction is freezing and weakly bound, and the third fraction is non-bound, free water freezing at 0 °C. According to structural features of water in HG, it can be divided into two fractions with strongly associated and weakly associated waters. The properties of the water in HG depend also on the amounts and types of solutes, pH, salinity, structural features of HG functionalities.
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Affiliation(s)
- Vladimir M Gun'ko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kyiv, Ukraine.
| | - Irina N Savina
- School of Pharmacy & Biomolecular Sciences, University of Brighton, BN2 4GJ Brighton, UK.
| | - Sergey V Mikhalovsky
- School of Pharmacy & Biomolecular Sciences, University of Brighton, BN2 4GJ Brighton, UK.
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Thankam FG, Dilisio MF, Agrawal DK. Immunobiological factors aggravating the fatty infiltration on tendons and muscles in rotator cuff lesions. Mol Cell Biochem 2016; 417:17-33. [PMID: 27160936 DOI: 10.1007/s11010-016-2710-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Accepted: 04/23/2016] [Indexed: 12/14/2022]
Abstract
Rotator cuff lesions (RCLs) are a common cause of shoulder pain and dysfunction. The rotator cuff tendons can degenerate and/or tear from the greater tuberosity of the humerus, which is associated with several anatomical, physiological, biochemical, and molecular changes in tendon and muscle. In this article, these pathways are critically reviewed and discussed with various management strategies of RCLs. The article also highlights the immunobiological responses following the RCL and the inherent repair mechanisms elicited by the body. The greatest difficulty in treating this pathology is that the muscle can undergo irreversible fatty infiltration in the setting of chronic tears that is associated with poor surgical outcomes. The article also investigates the key molecular pathways of the muscle homeostasis (mTOR, Rho kinase, AMPK, and Ca(2+)) with the energy metabolism to propose a possible mechanism for fatty infiltration. Future research is warranted to target the key players of these pathways in the management of fatty infiltration and thus RCL.
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Affiliation(s)
- Finosh G Thankam
- Department of Clinical & Translational Science, Creighton University School of Medicine, Omaha, NE, USA
| | - Matthew F Dilisio
- Department of Orthopedic Surgery, Creighton University School of Medicine, Omaha, NE, USA
| | - Devendra K Agrawal
- Department of Clinical & Translational Science, Creighton University School of Medicine, Omaha, NE, USA.
- Department of Clinical & Translational Science, The Peekie Nash Carpenter Endowed Chair in Medicine, Creighton University School of Medicine, CRISS II Room 510, 2500 California Plaza, Omaha, NE, 68178, USA.
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Radhakrishnan A, Jose GM, Kurup M. PEG-penetrated chitosan-alginate co-polysaccharide-based partially and fully cross-linked hydrogels as ECM mimic for tissue engineering applications. Prog Biomater 2015; 4:101-112. [PMID: 26566468 PMCID: PMC4636530 DOI: 10.1007/s40204-015-0041-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Accepted: 08/26/2015] [Indexed: 12/27/2022] Open
Abstract
The emerging strategy of tissue engineering for the management of end-stage organ failure and associated complications mainly relies on ECM mimicking scaffolds for neo-tissue genesis. In the current study, novel polyethylene glycol interpenetrated cross-linked hydrogel scaffold based on a co-polysaccharide (PIAC) synthesized from two marine heteropolysaccharides, alginate and chitosan, was designed. Partially cross-linked (PIAC-P) and fully cross-linked hydrogels (PIAC-F) were prepared. The physiochemical evaluations of both the hydrogels revealed the presence of alginate fraction and extensive -OH groups on the surface, sufficient water content and water holding capacity. The porosity and bulk density were also appreciable. The scaffolds were hemocompatible and were able to adsorb appreciable plasma proteins on to the surface. MTT assay on hydrogel extracts and direct contact assay showed the nontoxic effects of fibroblast cells upon contact with the hydrogel. Live/dead assay using ethidium bromide/acridine orange cocktail on fibroblast cells grown on the hydrogels after 5 days of initial seeding displayed green nucleus revealing the non-apoptotic cells. PIAC-P hydrogels were superior to certain aspects due to the availability of free functional groups than PIAC-F where most of these groups were utilized for cross-linking. The biological evaluations confirmed the healthy being and 3D growth of fibroblasts on the porous networks of both the hydrogels. The present hydrogel can form an ECM mimic and can form a potent candidate for various tissue engineering applications.
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Affiliation(s)
- Anitha Radhakrishnan
- Department of Biochemistry, University of Kerala, Karyavattom, Thiruvananthapuram, Kerala India
| | - Geena Mariya Jose
- Department of Biochemistry, University of Kerala, Karyavattom, Thiruvananthapuram, Kerala India
| | - Muraleedhara Kurup
- Department of Biochemistry, University of Kerala, Karyavattom, Thiruvananthapuram, Kerala India
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Photoluminescent PEG based comacromers as excitation dependent fluorophores for biomedical applications. Colloids Surf B Biointerfaces 2015; 135:243-252. [PMID: 26263212 DOI: 10.1016/j.colsurfb.2015.07.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 07/07/2015] [Accepted: 07/09/2015] [Indexed: 11/24/2022]
Abstract
We report a novel multi-modal biodegradable photoluminescent comacromer [poly(propylene fumarate)-PEG-glycine] (PLM) having excitation-dependent fluorescence (EDF) for biomedical applications. The photoluminescence of the synthesized PLM in aqueous and solid state condition, fluorescence life time and photo stability were evaluated. Hydrogels and nanogels were prepared from the PLM by cross linking with acrylic acid. Nanogels exhibited spherical morphology with a particle size of 100 nm as evaluated by transmission electron microscopy (TEM). In vitro cytotoxic and hemolytic studies revealed cytocompatibility. Furthermore, cellular imaging of nanogels on L929 fibroblast and Hela cell lines revealed EDF characteristics. We hypothesize that the EDF characteristics of the synthesized PLM may be attributed to the presence of n-π* interactions of the hydroxyl oxygen atoms of PEG with carbonyl groups of the ester linkages. Taken together, our results indicate that the synthesized PEG-based comacromer can serve as biocompatible fluorophores for various biomedical applications. More importantly, the facile way of synthesizing fluorescent polymers based on PEG with EDF characteristics demonstrated in this work can pave the way for developing more novel biocompatible fluorophores with wide range of biomedical applications.
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