1
|
Uehlin AF, Vines JB, Feldman DS, Nyairo E, Dean DR, Thomas V. Uni-Directionally Oriented Fibro-Porous PLLA/Fibrin Bio-Hybrid Scaffold: Mechano-Morphological and Cell Studies. Pharmaceutics 2022; 14:pharmaceutics14020277. [PMID: 35214010 PMCID: PMC8879164 DOI: 10.3390/pharmaceutics14020277] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/15/2022] [Accepted: 01/17/2022] [Indexed: 11/16/2022] Open
Abstract
In this study, we report a biohybrid oriented fibrous scaffold based on nanofibers of poly(l-lactic acid) (PLLA)/fibrin produced by electrospinning and subsequent post-treatment. Induced hydrolytic degradation of the fibers in 0.25 M NaOH solution for various time periods followed by the immobilization of fibrin on the hydrolyzed fiber surfaces was shown to significantly affect the mechanical properties, with the tensile strength (40.6 MPa ± 1.3) and strain at failure (38% ± 4.5) attaining a value within the range of human ligaments and ligament-replacement grafts. Unidirectional electrospinning with a mandrel rotational velocity of 26.4 m/s produced highly aligned fibers with an average diameter of 760 ± 96 nm. After a 20-min hydrolysis treatment in NaOH solution, this was further reduced to an average of 457 ± 89 nm, which is within the range of collagen bundles found in ligament tissue. Based on the results presented herein, the authors hypothesize that a combination of fiber orientation/alignment and immobilization of fibrin can result in the mechanical and morphological modification of PLLA tissue scaffolds for ligament-replacement grafts. Further, it was found that treatment with NaOH enhanced the osteogenic differentiation of hMSCs and the additional inclusion of fibrin further enhanced osteogenic differentiation, as demonstrated by decreased proliferative rates and increased ALP activity.
Collapse
Affiliation(s)
- Andrew F. Uehlin
- Department of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35205, USA;
| | - Jeremy B. Vines
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35205, USA; (J.B.V.); (D.S.F.)
| | - Dale S. Feldman
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35205, USA; (J.B.V.); (D.S.F.)
| | - Elijah Nyairo
- Biomedical Engineering, Alabama State University, Montgomery, AL 36101, USA;
| | - Derrick R. Dean
- Biomedical Engineering, Alabama State University, Montgomery, AL 36101, USA;
- Correspondence: (D.R.D.); (V.T.)
| | - Vinoy Thomas
- Department of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35205, USA;
- Correspondence: (D.R.D.); (V.T.)
| |
Collapse
|
2
|
Luo TD, Marquez-Lara A, Zabarsky ZK, Vines JB, Mowry KC, Jinnah AH, Ma X, Berwick BW, Willey JS, Li Z, Smith TL, O'Gara TJ. A percutaneous, minimally invasive annulus fibrosus needle puncture model of intervertebral disc degeneration in rabbits. J Orthop Surg (Hong Kong) 2019; 26:2309499018792715. [PMID: 30114959 DOI: 10.1177/2309499018792715] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
PURPOSE Various animal models have been proposed to mimic the pathophysiologic process of intervertebral disc degeneration, a leading cause of back pain. The purpose of this study is to describe a minimally invasive technique via percutaneous needle puncture of the annulus fibrosus in New Zealand white rabbits. METHODS Under fluoroscopic guidance, an 18-gauge spinal needle was inserted 2 cm lateral to the midline spinous process. The needle was slowly advanced at approximately 45° angle until it was adjacent to the L5/L6 disc space. Lateral and anteroposterior views were used to verify correct needle position before advancing into the nucleus pulposus. The rabbits underwent weekly X-rays for 4 weeks to assess disc height index. MRI T2 relaxation was evaluated at week four to assess morphological changes. Discs were histologically graded on a 12-point scale to assess degeneration and compared to discs obtained from uninjured rabbits. RESULTS There were no complications associated with the percutaneous needle puncture procedure. All animals survived the duration of the experiment. Four weeks after injury, the disc height had progressively narrowed to approximately 50% of baseline. MRI assessment at the 4-week time point demonstrated a mean T2 relaxation time at the L5/L6 level that was 20.9% of the T2 relaxation time at the uninjured L4/L5 disc level ( p < 0.001). Histological analysis demonstrated lamellar disorganization of the annulus and decreased cellularity and proteoglycan content within the injured nucleus compared to uninjured control discs. CONCLUSION The present study demonstrated a reliable technique of inducing an annular tear via a percutaneous needle puncture. Compared to open surgical approaches, the percutaneous model produces similar progressive disc degeneration while minimizing harm to the animal subjects. CLINICAL RELEVANCE The present study establishes a technique for the introduction of novel therapeutic agents to treat disc degeneration that may translate to future clinical trials.
Collapse
Affiliation(s)
- T David Luo
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Alejandro Marquez-Lara
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Zachary K Zabarsky
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Jeremy B Vines
- 2 Organogenesis Surgical and Sports Medicine, Birmingham, AL, USA
| | - Katie C Mowry
- 2 Organogenesis Surgical and Sports Medicine, Birmingham, AL, USA
| | - Alexander H Jinnah
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Xue Ma
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Benjamin W Berwick
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Jeffrey S Willey
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA.,3 Department of Radiation Oncology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Zhongyu Li
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Thomas L Smith
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Tadhg J O'Gara
- 1 Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| |
Collapse
|
3
|
Abstract
Gold is a multifunctional material that has been utilized in medicinal applications for centuries because it has been recognized for its bacteriostatic, anticorrosive, and antioxidative properties. Modern medicine makes routine, conventional use of gold and has even developed more advanced applications by taking advantage of its ability to be manufactured at the nanoscale and functionalized because of the presence of thiol and amine groups, allowing for the conjugation of various functional groups such as targeted antibodies or drug products. It has been shown that colloidal gold exhibits localized plasmon surface resonance (LPSR), meaning that gold nanoparticles can absorb light at specific wavelengths, resulting in photoacoustic and photothermal properties, making them potentially useful for hyperthermic cancer treatments and medical imaging applications. Modifying gold nanoparticle shape and size can change their LPSR photochemical activities, thereby also altering their photothermal and photoacoustic properties, allowing for the utilization of different wavelengths of light, such as light in the near-infrared spectrum. By manufacturing gold in a nanoscale format, it is possible to passively distribute the material through the body, where it can localize in tumors (which are characterized by leaky blood vessels) and be safely excreted through the urinary system. In this paper, we give a quick review of the structure, applications, recent advancements, and potential future directions for the utilization of gold nanoparticles in cancer therapeutics.
Collapse
Affiliation(s)
| | - Jee-Hyun Yoon
- Department of Herbology, College of Korean Medicine, Woosuk UniversityJeonju, South Korea
| | - Na-Eun Ryu
- School of Integrative Engineering, Chung-Ang UniversitySeoul, South Korea
| | - Dong-Jin Lim
- Otolaryngology Head and Neck Surgery, University of Alabama at BirminghamBirmingham, AL, United States
| | - Hansoo Park
- School of Integrative Engineering, Chung-Ang UniversitySeoul, South Korea
| |
Collapse
|
4
|
Vines JB, Lim DJ, Park H. Contemporary Polymer-Based Nanoparticle Systems for Photothermal Therapy. Polymers (Basel) 2018; 10:E1357. [PMID: 30961282 PMCID: PMC6401975 DOI: 10.3390/polym10121357] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 11/28/2018] [Accepted: 11/30/2018] [Indexed: 01/20/2023] Open
Abstract
Current approaches for the treatment of cancer, such as chemotherapy, radiotherapy, immunotherapy, and surgery, are limited by various factors, such as inadvertent necrosis of healthy cells, immunological destruction, or secondary cancer development. Hyperthermic therapy is a promising strategy intended to mitigate many of the shortcomings associated with traditional therapeutic approaches. However, to utilize this approach effectively, it must be targeted to specific tumor sites to prevent adverse side effects. In this regard, photothermal therapy, using intravenously-administered nanoparticle materials capable of eliciting hyperthermic effects in combination with the precise application of light in the near-infrared spectrum, has shown promise. Many different materials have been proposed, including various inorganic materials such as Au, Ag, and Germanium, and C-based materials. Unfortunately, these materials are limited by concerns about accumulation and potential cytotoxicity. Polymer-based nanoparticle systems have been investigated to overcome limitations associated with traditional inorganic nanoparticle systems. Some of the materials that have been investigated for this purpose include polypyrrole, poly-(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS), polydopamine, and polyaniline. The purpose of this review is to summarize these contemporary polymer-based nanoparticle technologies to acquire an understanding of their current applications and explore the potential for future improvements.
Collapse
Affiliation(s)
- Jeremy B Vines
- Organogenesis, Surgical and Sports Medicine, Birmingham, AL 35216, USA.
| | - Dong-Jin Lim
- Otolaryngology Head & Neck Surgery, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
| | - Hansoo Park
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Korea.
| |
Collapse
|
5
|
Lim DJ, Vines JB, Park H, Lee SH. Microneedles: A versatile strategy for transdermal delivery of biological molecules. Int J Biol Macromol 2018; 110:30-38. [DOI: 10.1016/j.ijbiomac.2017.12.027] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 11/13/2017] [Accepted: 12/05/2017] [Indexed: 10/18/2022]
|
6
|
McQuilling JP, Vines JB, Kimmerling KA, Mowry KC. Proteomic Comparison of Amnion and Chorion and Evaluation of the Effects of Processing on Placental Membranes. Wounds 2017; 29:E36-E40. [PMID: 28682294 PMCID: PMC8009308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OBJECTIVE The purpose of this study is to compare the growth factor and cytokine content found within the amnion and chorion layers and to determine the effects of dehydration on them. MATERIALS AND METHODS Placentas were collected from 5 to 6 consented donors following elective cesarean section, and 1-cm2 sections of either amnion or chorion were immediately stored at -80°C or dehydrated prior to -80°C storage until proteomic analysis. Signaling molecules from tissue samples were evaluated using quantitative multiplex proteomics microarrays, and data were analyzed based on a per cm2 basis and also on pg/mg of extracted protein for potency. RESULTS Fresh chorion contained more of some signaling molecules per cm2 compared with amnion. Specifically, the chorion contained significantly higher levels of adiponectin, APN, ANG-2, bFGF, EG-VEGF, HGF, IGF-1, PDGF-AA, PDGF-BB, TIMP-2, and TIMP-4. When samples were dehydrated, a significant drop in total growth factor and cytokine content was observed in both amnion and chorion samples with a loss of 51.1% ± 20.2% and 55.5% ± 37.3%, respectively. When evaluating the potency of fresh amnion and fresh chorion, there were similar levels of signaling molecules found with some exceptions. Amnion had significantly higher GAL-7, TGF-β1, and IL-1F5, and chorion had significantly more EG-VEGF, PDGF-BB, and TIMP-2. CONCLUSION The processing of placental membranes can have a dramatic effect on the total growth factor and cytokine load found within these tissues.
Collapse
Affiliation(s)
| | - Jeremy B Vines
- NuTech, a division of Organogenesis, Inc, Birmingham, AL
| | | | - Katie C Mowry
- NuTech, a division of Organogenesis, Inc, Birmingham, AL
| |
Collapse
|
7
|
McQuilling JP, Vines JB, Mowry KC. In vitro assessment of a novel, hypothermically stored amniotic membrane for use in a chronic wound environment. Int Wound J 2017; 14:993-1005. [PMID: 28370981 PMCID: PMC7949938 DOI: 10.1111/iwj.12748] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 03/03/2017] [Accepted: 03/04/2017] [Indexed: 12/18/2022] Open
Abstract
Chronic wounds require extensive healing time and place patients at risk of infection and amputation. Recently, a fresh hypothermically stored amniotic membrane (HSAM) was developed and has subsequently shown promise in its ability to effectively heal chronic wounds. The purpose of this study is to investigate the mechanisms of action that contribute to wound-healing responses observed with HSAM. A proteomic analysis was conducted on HSAM, measuring 25 growth factors specific to wound healing within the grafts. The rate of release of these cytokines from HSAMs was also measured. To model the effect of these cytokines and their role in wound healing, proliferation and migration assays with human fibroblasts and keratinocytes were conducted, along with tube formation assays measuring angiogenesis using media conditioned from HSAM. Additionally, the cell-matrix interactions between fibroblasts and HSAM were investigated. Conditioned media from HSAM significantly increased both fibroblast and keratinocyte proliferation and migration and induced more robust tube formation in angiogenesis assays. Fibroblasts cultured on HSAMs were found to migrate into and deposit matrix molecules within the HSAM graft. These collective results suggest that HSAM positively affects various critical pathways in chronic wound healing, lending further support to promising qualitative results seen clinically and providing further validation for ongoing clinical trials.
Collapse
Affiliation(s)
| | - Jeremy B Vines
- Research and Development, NuTech Medical, Birmingham, AL, USA
| | - Katie C Mowry
- Research and Development, NuTech Medical, Birmingham, AL, USA
| |
Collapse
|
8
|
|
9
|
Abstract
There are few treatment options for symptomatic knee osteoarthritis (OA). Human amniotic suspension allografts (ASA) have anti-inflammatory and chondroregenerative potential and thus represent a promising treatment strategy. In anticipation of a large, placebo-controlled trial of intra-articular ASA for symptomatic knee OA, an open-label prospective feasibility study was performed. Six patients with Kellgren-Lawrence grades 3 and 4 tibiofemoral knee OA were administered a single intra-articular ASA injection containing cryopreserved particulated human amnion and amniotic fluid cells. Patients were followed for 12 months after treatment. No significant injection reactions were noted. Compared with baseline there were (1) no significant effect of the ASA injection on blood cell counts, lymphocyte subsets, or inflammatory markers and (2) a small, but statistically significant increase in serum IgG and IgE levels. Patient-reported outcomes including International Knee Documentation Committee, Knee Injury and Osteoarthritis Outcome, and Single Assessment Numeric Evaluation scores were collected throughout the study and evaluated for up to 12 months. Overall, this study demonstrates the feasibility of a single intra-articular injection of ASA for the treatment of knee OA and provides the foundation for a large placebo-controlled trial of intra-articular ASA for symptomatic knee OA.
Collapse
Affiliation(s)
- Jeremy B Vines
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, Alabama
| | - Antonios O Aliprantis
- Division of Rheumatology, Immunology and Allergy, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Andreas H Gomoll
- Department of Orthopaedic Surgery, Brigham and Women's Hospital, Boston, Massachusetts
| | - Jack Farr
- OrthoIndy-Cartilage Restoration Center, Greenwood, Indiana
| |
Collapse
|
10
|
Alexander GC, Vines JB, Hwang P, Kim T, Kim JA, Brott BC, Yoon YS, Jun HW. Novel Multifunctional Nanomatrix Reduces Inflammation in Dynamic Conditions in Vitro and Dilates Arteries ex Vivo. ACS Appl Mater Interfaces 2016; 8:5178-5187. [PMID: 26849167 PMCID: PMC5179142 DOI: 10.1021/acsami.6b00565] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Inflammatory responses play a critical role in tissue-implant interactions, often limiting current implant utility. This is particularly true for cardiovascular devices. Existing stent technology does little to avoid or mitigate inflammation or to influence the vasomotion of the artery after implantation. We have developed a novel endothelium-mimicking nanomatrix composed of peptide amphiphiles that enhances endothelialization while decreasing both smooth muscle cell proliferation and platelet adhesion. Here, we evaluated whether the nanomatrix could prevent inflammatory responses under static and physiological flow conditions. We found that the nanomatrix reduced monocyte adhesion to endothelial cells and expression of monocyte inflammatory genes (TNF-α, MCP-1, IL-1β, and IL-6). Furthermore, the nitric-oxide releasing nanomatrix dramatically attenuated TNF-α-stimulated inflammatory responses as demonstrated by significantly reduced monocyte adhesion and inflammatory gene expression in both static and physiological flow conditions. These effects were abolished by addition of a nitric oxide scavenger. Finally, the nanomatrix stimulated vasodilation in intact rat mesenteric arterioles after constriction with phenylephrine, demonstrating the bioavailability and bioactivity of the nanomatrix, as well as exhibiting highly desired release kinetics. These results demonstrate the clinical potential of this nanomatrix by both preventing inflammatory responses and promoting vasodilation, critical improvements in stent and cardiovascular device technology.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Young-Sup Yoon
- School of Medicine, Division of Cardiology, Emory University , Atlanta, Georgia 30322, United States
- Severance Biomedical Science Institute, Yonsei University College of Medicine , Seoul, Korea
| | | |
Collapse
|
11
|
Yoo C, Vines JB, Alexander G, Murdock K, Hwang P, Jun HW. Adult stem cells and tissue engineering strategies for salivary gland regeneration: a review. Biomater Res 2014; 18:9. [PMID: 26331060 PMCID: PMC4549133 DOI: 10.1186/2055-7124-18-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 07/09/2014] [Indexed: 02/07/2023] Open
Abstract
Saliva is an important compound produced by the salivary glands and performs numerous functions. Hyposalivation (dry mouth syndrome) is a deleterious condition often resulting from radiotherapy for patients with head and neck cancer, Sjogren's Syndrome, or as a side effect of certain medications. Hyposalivation negatively affects speaking, mastication, and swallowing in afflicted patients, greatly reducing their quality of life. Current treatments for this pathology include modifying lifestyle, synthetic saliva supplementation, and the utilization of salivary gland stimulants and sialagogues. However, many of these treatments do not address the underlying issues and others are pervaded by numerous side effects. In order to address the shortcomings related to current treatment modalities, many groups have diverted their attention to utilizing tissue engineering and regenerative medicine approaches. Tissue engineering is defined as the application of life sciences and materials engineering toward the development of tissue substitutes that are capable of mimicking the structure and function of their natural analogues within the body. The general underlying strategy behind the development of tissue engineered organ substitutes is the utilization of a combination of cells, biomaterials, and biochemical cues intended to recreate the natural organ environment. The purpose of this review is to highlight current bioengineering approaches for salivary gland tissue engineering and the adult stem cell sources used for this purpose. Additionally, future considerations in regard to salivary gland tissue engineering strategies are discussed.
Collapse
Affiliation(s)
- Chankee Yoo
- />Department of Biomedical Engineering, University of Alabama at Birmingham, Shelby Building 806, 1825 University Boulevard, Birmingham, AL 35294 USA
- />Department of Otorhinolaryngology-Head and Neck Surgery, CHA Bundang Medical Center, CHA University, 59 Yatap-ro, Gyeonggi-do, Bundang-gu, Seongnam-si, 463-712 South Korea
| | - Jeremy B Vines
- />Department of Biomedical Engineering, University of Alabama at Birmingham, Shelby Building 806, 1825 University Boulevard, Birmingham, AL 35294 USA
| | - Grant Alexander
- />Department of Biomedical Engineering, University of Alabama at Birmingham, Shelby Building 806, 1825 University Boulevard, Birmingham, AL 35294 USA
| | - Kyle Murdock
- />Department of Biomedical Engineering, University of Alabama at Birmingham, Shelby Building 806, 1825 University Boulevard, Birmingham, AL 35294 USA
| | - Patrick Hwang
- />Department of Biomedical Engineering, University of Alabama at Birmingham, Shelby Building 806, 1825 University Boulevard, Birmingham, AL 35294 USA
| | - Ho-Wook Jun
- />Department of Biomedical Engineering, University of Alabama at Birmingham, Shelby Building 806, 1825 University Boulevard, Birmingham, AL 35294 USA
| |
Collapse
|
12
|
Lim DJ, Andukuri A, Vines JB, Rahman SM, Hwang PT, Kim J, Shalev A, Corbett JA, Jun HW. Enhanced MIN-6 beta cell survival and function on a nitric oxide-releasing peptide amphiphile nanomatrix. Int J Nanomedicine 2014; 9 Suppl 1:13-21. [PMID: 24872700 PMCID: PMC4024973 DOI: 10.2147/ijn.s50873] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Innovative biomaterial strategies are required to improve islet cell retention, viability, and functionality, and thereby obtain clinically successful outcomes from pancreatic islet cell transplantation. To address this need, we have developed a peptide amphiphile-based nanomatrix that incorporates multifunctional bioactive cues and sustained release of nitric oxide. The goal of this study was to evaluate the effect of this peptide amphiphile nanomatrix on the viability and functionality of MIN-6 islet cells. Additionally, this study provides insight into the role of nitric oxide in islet cell biology, given that conventional nitric oxide donors are unable to release nitric oxide in a controlled, sustained manner, leading to ambiguous results. It was hypothesized that controlled nitric oxide release in synergy with multifunctional bioactive cues would promote islet cell viability and functionality. Nitric oxide-releasing peptide amphiphile nanomatrices within the range of 16.25 μmol to 130 μmol were used to analyze MIN-6 cell behavior. Both 32.5 μmol and 65 μmol peptide amphiphiles showed improved MIN-6 functionality in response to glucose over a 7-day time period, and the elevated functionality was correlated with both PDX-1 and insulin gene expression. Our results demonstrate that nitric oxide has a beneficial effect on MIN-6 cells in a concentration-dependent manner.
Collapse
Affiliation(s)
- Dong-Jin Lim
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Adinarayana Andukuri
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Jeremy B Vines
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA ; Nutech Medical Inc, Division of Endocrinology, Diabetes and Metabolism, Birmingham, AL, USA
| | - Shibli M Rahman
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Patrick Tj Hwang
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Jeonga Kim
- Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, Birmingham, AL, USA
| | - Anath Shalev
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA ; Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - John A Corbett
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Ho-Wook Jun
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA ; Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL, USA
| |
Collapse
|
13
|
Lim DJ, Antipenko SV, Vines JB, Andukuri A, Hwang PTJ, Hadley NT, Rahman SM, Corbett JA, Jun HW. Improved MIN6 β-cell function on self-assembled peptide amphiphile nanomatrix inscribed with extracellular matrix-derived cell adhesive ligands. Macromol Biosci 2013; 13:1404-12. [PMID: 23966265 DOI: 10.1002/mabi.201300155] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 06/03/2013] [Indexed: 02/02/2023]
Abstract
Understanding the role of the pancreatic extracellular matrix (ECM) in supporting islet survival and function drives the pursuit to create biomaterials that imitate and restore the pancreatic ECM microenvironment. To create an ECM mimic holding bioinductive cues for β-cells, self-assembled peptide amphiphiles (PAs) inscribed with four selected ECM-derived cell adhesive ligands are synthesized. After 7 days, compared to control groups cultured on biologically inert substrates, MIN6 β-cells cultured on PAs functionalized with YIGSR and RGDS cell adhesive ligands exhibit elevated insulin secretion in responses to glucose and also form β-cell clusters. These findings suggest that the self-assembled PA nanomatrix may be utilized to improve pancreatic islet transplantation for treating type 1 diabetes.
Collapse
Affiliation(s)
- Dong-Jin Lim
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, Alabama 35233, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Vines JB, Lim DJ, Anderson JM, Jun HW. Hydroxyapatite nanoparticle reinforced peptide amphiphile nanomatrix enhances the osteogenic differentiation of mesenchymal stem cells by compositional ratios. Acta Biomater 2012; 8:4053-63. [PMID: 22842043 DOI: 10.1016/j.actbio.2012.07.024] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Revised: 07/11/2012] [Accepted: 07/13/2012] [Indexed: 12/13/2022]
Abstract
In the field of bone tissue engineering, there is a need for materials that mimic the native bone extracellular matrix (ECM). This need is met through the creation of biphasic composites intended to mimic both the organic and inorganic facets of the native bone ECM. However, few studies have created composites with organic ECM analogous components capable of directing cellular behaviors and many are not fabricated in the nanoscale. Furthermore, few attempts have been made at investigating how variations of organic and inorganic components affect the osteogenic differentiation of human mesenchymal stem cells (hMSCs). To address these issues, biphasic nanomatrix composites consisting of hydroxyapatite nanoparticles (HANPs) embedded within peptide amphiphile (PA) nanofibers tailored with the RGDS cellular adhesion motif (PA-RGDS) were created at various HANP to PA-RGDS ratios. Fabrication of these biphasic nanomatrix composites was confirmed via scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The long-term cellularity and osteogenic differentiation of hMSCs in response to the different compositional ratios were then assessed by quantifying the timed expression of genes indicative of osteogenic differentiation, alkaline phosphatase activity, and DNA content over time. Decreased cellularity and the expression of genes over time correlated with increasing compositional ratios between HANP and PA-RGDS. The highest HANP to PA-RGDS ratio (66% HANP) exhibited the greatest improvement to the osteogenic differentiation of hMSCs. Overall, these results demonstrate that the compositional ratio of biphasic nanomatrix composites plays an important role in influencing the osteogenic differentiation of hMSCs. Based on the observations presented within this study, these biphasic nanomatrix composites show promise for future usage in bone tissue engineering applications.
Collapse
|
15
|
Andukuri A, Vines JB, Anderson JM, Jun HW. Supramolecular Systems for Tissue Engineering. Supramol Chem 2012. [DOI: 10.1002/9780470661345.smc183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
16
|
Anderson JM, Patterson JL, Vines JB, Javed A, Gilbert SR, Jun HW. Biphasic peptide amphiphile nanomatrix embedded with hydroxyapatite nanoparticles for stimulated osteoinductive response. ACS Nano 2011; 5:9463-79. [PMID: 22077993 PMCID: PMC3691849 DOI: 10.1021/nn203247m] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Formation of the native bone extracellular matrix (ECM) provides an attractive template for bone tissue engineering. The structural support and biological complexity of bone ECM are provided within a composite microenvironment that consists of an organic fibrous network reinforced by inorganic hydroxyapatite (HA) nanoparticles. Recreating this biphasic assembly, a bone ECM analogous scaffold comprising self-assembling peptide amphiphile (PA) nanofibers and interspersed HA nanoparticles was investigated. PAs were endowed with biomolecular ligand signaling using a synthetically inscribed peptide sequence (i.e., RGDS) and integrated with HA nanoparticles to form a biphasic nanomatrix hydrogel. It was hypothesized the biphasic hydrogel would induce osteogenic differentiation of human mesenchymal stem cells (hMSCs) and improve bone healing as mediated by RGDS ligand signaling within PA nanofibers and embedded HA mineralization source. Viscoelastic stability of the biphasic PA hydrogels was evaluated with different weight concentrations of HA for improved gelation. After demonstrating initial viability, long-term cellularity and osteoinduction of encapsulated hMSCs in different PA hydrogels were studied in vitro. Temporal progression of osteogenic maturation was assessed by gene expression of key markers. A preliminary animal study demonstrated bone healing capacity of the biphasic PA nanomatrix under physiological conditions using a critical size femoral defect rat model. The combination of RGDS ligand signaling and HA nanoparticles within the biphasic PA nanomatrix hydrogel demonstrated the most effective osteoinduction and comparative bone healing response. Therefore, the biphasic PA nanomatrix establishes a well-organized scaffold with increased similarity to natural bone ECM with the prospect for improved bone tissue regeneration.
Collapse
Affiliation(s)
- Joel M. Anderson
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294-2182, United States
| | - Jessica L. Patterson
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294-2182, United States
| | - Jeremy B. Vines
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294-2182, United States
| | - Amjad Javed
- Institute of Oral Health Research, University of Alabama at Birmingham, Birmingham, AL 35294-2182, United States
| | - Shawn R. Gilbert
- Department of Surgery, University of Alabama at Birmingham, Birmingham, AL 35294-2182, United States
| | - Ho-Wook Jun
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294-2182, United States
| |
Collapse
|
17
|
Anderson JM, Vines JB, Patterson JL, Chen H, Javed A, Jun HW. Osteogenic differentiation of human mesenchymal stem cells synergistically enhanced by biomimetic peptide amphiphiles combined with conditioned medium. Acta Biomater 2011; 7:675-82. [PMID: 20728586 PMCID: PMC2999640 DOI: 10.1016/j.actbio.2010.08.016] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 08/12/2010] [Accepted: 08/17/2010] [Indexed: 12/18/2022]
Abstract
An attractive strategy for bone tissue engineering is the use of extracellular matrix (ECM) analogous biomaterials capable of governing biological response based on synthetic cell-ECM interactions. In this study, peptide amphiphiles (PAs) were investigated as an ECM-mimicking biomaterial to provide an instructive microenvironment for human mesenchymal stem cells (hMSCs) in an effort to guide osteogenic differentiation. PAs were biologically functionalized with ECM isolated ligand sequences (i.e. RGDS, DGEA), and the osteoinductive potential was studied with or without conditioned medium, containing the supplemental factors of dexamethasone, β-glycerol phosphate and ascorbic acid. It was hypothesized that the ligand-functionalized PAs would synergistically enhance osteogenic differentiation in combination with conditioned medium. Concurrently, comparative evaluations independent of osteogenic supplements investigated the differentiating potential of the functionalized PA scaffolds as promoted exclusively by the inscribed ligand signals, thus offering the potential for therapeutic effectiveness under physiological conditions. Osteoinductivity was assessed by histochemical staining for alkaline phosphatase (ALP) and quantitative real-time polymerase chain reaction analysis of key osteogenic markers. Both of the ligand-functionalized PAs were found to synergistically enhance the level of visualized ALP activity and osteogenic gene expression compared to the control surfaces lacking biofunctionality. Guided osteoinduction was also observed without supplemental aid on the PA scaffolds, but at a delayed response and not to the same phenotypic levels. Thus, the biomimetic PAs foster a symbiotic enhancement of osteogenic differentiation, demonstrating the potential of ligand-functionalized biomaterials for future bone tissue repair.
Collapse
Affiliation(s)
- Joel M. Anderson
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Jeremy B. Vines
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Jessica L. Patterson
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Haiyan Chen
- Institute of Oral Health Research, School of Dentistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Amjad Javed
- Institute of Oral Health Research, School of Dentistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Ho-Wook Jun
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| |
Collapse
|