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Flanagan D. Submucosal administration of dexamethasone for dental implant surgery. Clin Case Rep 2022; 10:e6589. [PMID: 36447671 PMCID: PMC9701881 DOI: 10.1002/ccr3.6589] [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: 06/22/2022] [Revised: 07/15/2022] [Accepted: 07/30/2022] [Indexed: 11/29/2022] Open
Abstract
Dexamethasone can reduce post-operative pain and swelling. An appropriate administration of dexamethasone for dental surgical procedures may be local submucosal infiltration. Local delivery may produce a faster onset with more drug at the desired site of action. A single submucosal dose will unlikely produce side effects.
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Affiliation(s)
- Dennis Flanagan
- Department of Dental MedicineLugano University of SwitzerlandLuganoSwitzerland
- Private PracticeWillimanticConnecticutUSA
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Li X, Xu L, Nie H, Lei L. Dexamethasone-loaded β-cyclodextrin for osteogenic induction of mesenchymal stem/progenitor cells and bone regeneration. J Biomed Mater Res A 2020; 109:1125-1135. [PMID: 32981208 DOI: 10.1002/jbm.a.37104] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 09/23/2020] [Accepted: 09/26/2020] [Indexed: 01/11/2023]
Abstract
Dexamethasone (DEX) is a glucocorticoid commonly used as an in vitro osteogenic inducer of mesenchymal stem/progenitor cells (abbreviated MSCs). However, several studies investigating the effects of glucocorticoids on bone regeneration through systemic injections have demonstrated negative impacts of the drugs at high concentration on the healing of hard tissues. These contrasting evidences suggest that application of glucocorticoids should be limited to low dosages but at the same time a long enough treatment period is preferred, which prompted us to evaluate the effects of different local release systems of DEX on MSC differentiation and bone repair. Two types of DEX-loaded β-cyclodextrin (CD) complexes, including CD/DEX and CD/AD-DEX, were fabricated via host-guest interactions and characterized by FTIR, 1H-NMR, MS-ESI, and UV-vis. The results demonstrated that these CD-based assemblies released DEX in differentiated profiles, with CD/DEX releasing significantly faster than CD/AD-DEX. Although CD/DEX were slightly more powerful than CD/AD-DEX in inducing rat bone marrow MSCs (rBMSCs) into osteogenic lineage in vitro, CD/AD-DEX was advantageous over CD/DEX in accelerating bone regeneration over a time period of 4 weeks in a rat tibia defect model. The results suggest that DEX-loaded assemblies via host-guest interactions are flexible in modulating DEX release patterns and have great potential in bone tissue engineering.
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Affiliation(s)
- Xing Li
- Department of Orthodontics, Central South University Xiangya Stomatological Hospital, Changsha, China
| | - Lu Xu
- Department of Biomedical Engineering, College of Biology, Hunan University, Changsha, China
| | - Hemin Nie
- Department of Biomedical Engineering, College of Biology, Hunan University, Changsha, China
| | - Lei Lei
- Department of Orthodontics, Central South University Xiangya Stomatological Hospital, Changsha, China
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Kosorn W, Sakulsumbat M, Lertwimol T, Thavornyutikarn B, Uppanan P, Chantaweroad S, Janvikul W. Chondrogenic phenotype in responses to poly(ɛ-caprolactone) scaffolds catalyzed by bioenzymes: effects of surface topography and chemistry. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2019; 30:128. [PMID: 31776772 DOI: 10.1007/s10856-019-6335-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 11/16/2019] [Indexed: 06/10/2023]
Abstract
Biodegradable poly(ε-caprolactone) (PCL) has been increasingly investigated as a promising scaffolding material for articular cartilage tissue repair. However, its use can be limited due to its surface hydrophobicity and topography. In this study, 3D porous PCL scaffolds fabricated by a fused deposition modeling (FDM) machine were enzymatically hydrolyzed using two different biocatalysts, namely Novozyme®435 and Amano lipase PS, at varied treatment conditions in a pH 8.0 phosphate buffer solution. The improved surface topography and chemistry of the PCL scaffolds were anticipated to ultimately boost the growth of porcine articular chondrocytes and promote the chondrogenic phenotype during cell culture. Alterations in surface roughness, wettability, and chemistry of the PCL scaffolds after enzymatic treatment were thoroughly investigated using several techniques, e.g., SEM, AFM, contact angle and surface energy measurement, and XPS. With increasing enzyme content, incubation time, and incubation temperature, the surfaces of the PCL scaffolds became rougher and more hydrophilic. In addition, Novozyme®435 was found to have a higher enzyme activity than Amano lipase PS when both were used in the same enzymatic treatment condition. Interestingly, the enzymatic degradation process rarely induced the deterioration of compressive strength of the bulk porous PCL material and slightly reduced the molecular weight of the material at the filament surface. After 28 days of culture, both porous PCL scaffolds catalyzed by Novozyme®435 and Amano lipase PS could facilitate the chondrocytes to not only proliferate properly, but also function more effectively, compared with the non-modified porous PCL scaffold. Furthermore, the enzymatic treatments with 50 mg of Novozyme®435 at 25 °C from 10 min to 60 min were evidently proven to provide the optimally enhanced surface roughness and hydrophilicity most significantly favorable for induction of chondrogenic phenotype, indicated by the greatest expression level of cartilage-specific gene and the largest production of total glycosaminoglycans.
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Affiliation(s)
- Wasana Kosorn
- National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Road, Klong Luang, Pathumthani, 12120, Thailand
| | - Morakot Sakulsumbat
- National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Road, Klong Luang, Pathumthani, 12120, Thailand
| | - Tareerat Lertwimol
- National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Road, Klong Luang, Pathumthani, 12120, Thailand
| | - Boonlom Thavornyutikarn
- National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Road, Klong Luang, Pathumthani, 12120, Thailand
| | - Paweena Uppanan
- National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Road, Klong Luang, Pathumthani, 12120, Thailand
| | - Surapol Chantaweroad
- National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Road, Klong Luang, Pathumthani, 12120, Thailand
| | - Wanida Janvikul
- National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Road, Klong Luang, Pathumthani, 12120, Thailand.
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Dang YNT, Tran PHL, Tran TTD. Development of the Modified Ocimum gratissimum Seeds for Orally Disintegrating Tablets. ACTA ACUST UNITED AC 2019; 14:40-47. [PMID: 31660821 PMCID: PMC7569283 DOI: 10.2174/1872211313666191029144038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 08/28/2019] [Accepted: 10/08/2019] [Indexed: 11/23/2022]
Abstract
Background Natural materials have been encouraged in controlled drug release and improved drug bioavailability. Objective This study aimed to develop a modification process for the use of a natural material, Ocimum gratissimum seeds (OGS), in Orally Disintegrating Tablets (ODTs). Methods The OGS was investigated with four different modification processes including only milling, swelling, swelling/milling, and swelling/milling/incubation. The ODTs containing the modified OGS as a disintegrant were prepared by the wet granulation method. Furthermore, an evaluation to assess parameters of tablets, such as weight variation, hardness, friability, wetting time, disintegration time, drug content, and dissolution studies, was performed. Results The modification of OGS using the swelling/ milling process resulted in a completion of OGS modification, leading to an ideal wetting time, disintegrating time, and dissolution rate. The OGS concentrations also affected the wetting and disintegrating time with the optimal range of ODTs from 15% to 20%. On the other hand, the modification with the incubation processes varied by temperature and time increased the wetting time and disintegrating time. Conclusions The modified OGS demonstrated that it is a potential material with the advantages of cost-effectiveness, non-toxicity and easy manufacture in the preparation of ODTs.
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Affiliation(s)
- Yen N T Dang
- International University, Ho Chi Minh City, Vietnam
| | - Phuong H L Tran
- Deakin University, Geelong Australia, School of Medicine, Australia
| | - Thao T D Tran
- Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam.,Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City, Vietnam
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Modified sprouted rice for modulation of curcumin crystallinity and dissolution enhancement by solid dispersion. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2018. [DOI: 10.1007/s40005-018-0393-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Sears NA, Pena-Galea G, Cereceres SN, Cosgriff-Hernandez E. Hybrid polyurea elastomers with enzymatic degradation and tunable mechanical properties. J Tissue Eng 2016; 7:2041731416679363. [PMID: 27994846 PMCID: PMC5153027 DOI: 10.1177/2041731416679363] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 10/25/2016] [Indexed: 11/15/2022] Open
Abstract
Herein, we report on the synthesis and characterization of enzymatically labile polyureas for use as a tissue-engineered ligament scaffold. Polyureas were selected due to their excellent tensile properties, fatigue resistance, and highly tunable nature. Incorporation of a collagenase-sensitive peptide into the backbone of the polyurea provided a means to confer cell-responsive degradation to the synthetic polymer. Chemical, morphological, and mechanical testing were used to confirm incorporation of the peptide and characterize polyurea films. Notably, the incorporation of the peptide resulted in an increase in modulus, elongation, and tensile strength. This was attributed to an increase in phase mixing and an increase in hydrogen bonding between the hard and soft segments. Candidate polyureas with varying levels of collagen-mimetic peptide (0%, 10%, 20%) were then subjected to degradation in collagenase media or buffer at 37°C over 4 weeks. Statistically significant decreases in strength and elongation were observed in polyureas with 20% peptide content after collagenase treatment, whereas specimens in phosphate-buffered saline showed no statistically significant difference. These observations confirmed that enzyme-specific degradation was conferred to the polyurea. Overall, these polyureas hold great promise as a material for ligament reconstruction due to the promising mechanical properties and potential for cell-mediated degradation.
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Affiliation(s)
- Nicholas A Sears
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Geraldine Pena-Galea
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Stacy N Cereceres
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
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Ngo VD, Luu TD, Van Vo T, Tran VT, Duan W, Tran PHL, Tran TTD. An investigation of effects of modification processes on physical properties and mechanism of drug release for sustaining drug release from modified rice. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 67:1-7. [PMID: 27287092 DOI: 10.1016/j.msec.2016.04.098] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 04/15/2016] [Accepted: 04/29/2016] [Indexed: 11/30/2022]
Abstract
The aim of this study was to investigate the effect of modification processes on physical properties and explain the mechanism of sustained drug release from modified rice (MR). Various types of Vietnamese rice were introduced in the study as the matrices of sustained release dosage form. Rice was thermally modified in water for a determined temperature at different times with a simple process. Then tablets containing MR and isradipine, the model drug, were prepared to investigate the capability of sustained drug release. Scanning electron microscopy (SEM) was used to determine different morphologies between MR formulations. Flow property of MR was analyzed by Hausner ratio and Carr's indices. The dissolution rate and swelling/erosion behaviors of tablets were evaluated at pH 1.2 and pH6.8 at 37±0.5°C. The matrix tablet containing MR showed a sustained release as compared to the control. The SEM analyses and swelling/erosion studies indicated that the morphology as well as swelling/erosion rate of MR were modulated by modification time, drying method and incubation. It was found that the modification process was crucial because it could highly affect the granule morphologies and hence, leading to the change of flowability and swelling/erosion capacity for sustained release of drug.
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Affiliation(s)
- Vuong Duy Ngo
- Pharmaceutical Engineering Laboratory, Biomedical Engineering Department, International University, Vietnam National University, Ho Chi Minh City, Viet Nam
| | - Thinh Duc Luu
- Pharmaceutical Engineering Laboratory, Biomedical Engineering Department, International University, Vietnam National University, Ho Chi Minh City, Viet Nam
| | - Toi Van Vo
- Pharmaceutical Engineering Laboratory, Biomedical Engineering Department, International University, Vietnam National University, Ho Chi Minh City, Viet Nam
| | - Van-Thanh Tran
- Faculty of Pharmacy, University of Medicine and Pharmacy, Ho Chi Minh City, Viet Nam
| | - Wei Duan
- School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, Victoria, Australia
| | - Phuong Ha-Lien Tran
- School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, Victoria, Australia.
| | - Thao Truong-Dinh Tran
- Pharmaceutical Engineering Laboratory, Biomedical Engineering Department, International University, Vietnam National University, Ho Chi Minh City, Viet Nam.
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Masaeli R, Jafarzadeh Kashi TS, Dinarvand R, Rakhshan V, Shahoon H, Hooshmand B, Mashhadi Abbas F, Raz M, Rajabnejad A, Eslami H, Khoshroo K, Tahriri M, Tayebi L. Efficacy of the biomaterials 3wt%-nanostrontium-hydroxyapatite-enhanced calcium phosphate cement (nanoSr-CPC) and nanoSr-CPC-incorporated simvastatin-loaded poly(lactic-co-glycolic-acid) microspheres in osteogenesis improvement: An explorative multi-phase experimental in vitro/vivo study. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 69:171-83. [PMID: 27612702 DOI: 10.1016/j.msec.2016.06.033] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2016] [Revised: 05/14/2016] [Accepted: 06/09/2016] [Indexed: 11/17/2022]
Abstract
AIMS The purpose of this multi-phase explorative in vivo animal/surgical and in vitro multi-test experimental study was to (1) create a 3wt%-nanostrontium hydroxyapatite-enhanced calcium phosphate cement (Sr-HA/CPC) for increasing bone formation and (2) creating a simvastatin-loaded poly(lactic-co-glycolic acid) (SIM-loaded PLGA) microspheres plus CPC composite (SIM-loaded PLGA+nanostrontium-CPC). The third goal was the extensive assessment of multiple in vitro and in vivo characteristics of the above experimental explorative products in vitro and in vivo (animal and surgical studies). METHODS AND RESULTS PERTAINING TO SR-HA/CPC Physical and chemical properties of the prepared Sr-HA/CPC were evaluated. MTT assay and alkaline phosphatase activities, and radiological and histological examinations of Sr-HA/CPC, CPC and negative control were compared. X-ray diffraction (XRD) indicated that crystallinity of the prepared cement increased by increasing the powder-to-liquid ratio. Incorporation of Sr-HA into CPC increased MTT assay (biocompatibility) and ALP activity (P<0.05). Histomorphometry showed greater bone formation after 4weeks, after implantation of Sr-HA/CPC in 10 rats compared to implantations of CPC or empty defects in the same rats (n=30, ANOVA P<0.05). METHODS AND RESULTS PERTAINING TO SIM-LOADED PLGA MICROSPHERES+NANOSTRONTIUM-CPC COMPOSITE: After SEM assessment, the produced composite of microspheres and enhanced CPC were implanted for 8weeks in 10 rabbits, along with positive and negative controls, enhanced CPC, and enhanced CPC plus SIM (n=50). In the control group, only a small amount of bone had been regenerated (localized at the boundary of the defect); whereas, other groups showed new bone formation within and around the materials. A significant difference was found in the osteogenesis induced by the groups sham control (16.96±1.01), bone materials (32.28±4.03), nanostrontium-CPC (24.84±2.6), nanostrontium-CPC-simvastatin (40.12±3.29), and SIM-loaded PLGA+nanostrontium-CPC (44.8±6.45) (ANOVA P<0.001). All the pairwise comparisons were significant (Tukey P<0.01), except that of nanostrontium-CPC-simvastatin and SIM-loaded PLGA+nanostrontium-CPC. This confirmed the efficacy of the SIM-loaded PLGA+nanostrontium-CPC composite, and its superiority over all materials except SIM-containing nanostrontium-CPC.
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Affiliation(s)
- Reza Masaeli
- Dental Biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Tahereh Sadat Jafarzadeh Kashi
- Dental Biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran; Iranian Tissue Bank and Research Center, Tehran University of Medical Sciences, Tehran, Iran.
| | - Rassoul Dinarvand
- Department of Pharmaceutics, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Vahid Rakhshan
- Iranian Tissue Bank and Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Hossein Shahoon
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahed University, Tehran, Iran
| | - Behzad Hooshmand
- Department of Periodontology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fatemeh Mashhadi Abbas
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Shahid Beheshti Medical Science University, Tehran, Iran
| | - Majid Raz
- Biomaterials Group, Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
| | - Alireza Rajabnejad
- Biomaterials Group, Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
| | - Hossein Eslami
- Biomaterials Group, Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
| | - Kimia Khoshroo
- Dental Biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran; Department of Developmental Sciences, School of Dentistry, Marquette University, Milwaukee, WI, USA
| | - Mohammadreza Tahriri
- Dental Biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran; Iranian Tissue Bank and Research Center, Tehran University of Medical Sciences, Tehran, Iran; Biomaterials Group, Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran; Department of Developmental Sciences, School of Dentistry, Marquette University, Milwaukee, WI, USA
| | - Lobat Tayebi
- Department of Developmental Sciences, School of Dentistry, Marquette University, Milwaukee, WI, USA; Biomaterials and Advanced Drug Delivery Laboratory, School of Medicine, Stanford University, Palo Alto, CA, USA
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Balmayor ER. Targeted delivery as key for the success of small osteoinductive molecules. Adv Drug Deliv Rev 2015; 94:13-27. [PMID: 25959428 DOI: 10.1016/j.addr.2015.04.022] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 04/20/2015] [Accepted: 04/29/2015] [Indexed: 02/08/2023]
Abstract
Molecules such as growth factors, peptides and small molecules can guide cellular behavior and are thus important for tissue engineering. They are rapidly emerging as promising compounds for the regeneration of tissues of the musculoskeletal system. Growth factors have disadvantages such as high cost, short half-life, supraphysiological amounts needed, etc. Therefore, small molecules may be an alternative. These molecules have been discovered using high throughput screening. Small osteoinductive molecules exhibit several advantages over growth factors owing to their small sizes, such as high stability and non-immunogenicity. These molecules may stimulate directly signaling pathways that are important for osteogenesis. However, systemic application doesn't induce osteogenesis in most cases. Therefore, local administration is needed. This may be achieved by using a bone graft material providing additional osteoconductive properties. These graft materials can also act by themselves as a delivery matrix for targeted and local delivery. Furthermore, vascularization is necessary in the process of osteogenesis. Many of the small molecules are also capable of promoting vascularization of the tissue to be regenerated. Thus, in this review, special attention is given to molecules that are capable of inducing both angiogenesis and osteogenesis simultaneously. Finally, more recent preclinical and clinical uses in bone regeneration of those molecules are described, highlighting the needs for the clinical translation of these promising compounds.
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Pereira JD, Camargo RC, Filho JC, Alves N, Rodriguez-Perez MA, Constantino CJ. Biomaterials from blends of fluoropolymers and corn starch—implant and structural aspects. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 36:226-36. [DOI: 10.1016/j.msec.2013.12.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 10/07/2013] [Accepted: 12/06/2013] [Indexed: 11/16/2022]
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Costa-Pinto AR, Martins AM, Castelhano-Carlos MJ, Correlo VM, Sol PC, Longatto-Filho A, Battacharya M, Reis RL, Neves NM. In vitro degradation and in vivo biocompatibility of chitosan–poly(butylene succinate) fiber mesh scaffolds. J BIOACT COMPAT POL 2014. [DOI: 10.1177/0883911514521919] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In tissue engineering, the evaluation of the host response to the biomaterial implantation must be assessed to determine the extent of the inflammatory reaction. We studied the degradation of poly(butylene succinate) and chitosan in vitro using lipase and lysozyme enzymes, respectively. The subcutaneous implantation of the scaffolds was performed to assess tissue response. The type of inflammatory cells present in the surrounding tissue, as well as within the scaffold, was determined histologically and by immunohistochemistry. In the presence of lipase or lysozyme, the water uptake of the scaffolds increased. Based on the weight loss data and scanning electron microscopy analysis, the lysozyme combined with lipase had a notable effect on the in vitro degradation of the scaffolds. The in vivo implantation showed a normal inflammatory response, with presence of neutrophils, in a first stage, and macrophages, lymphocytes, and giant cells in a later stage. Vascularization in the surrounding tissue and within the implant increased with time. Moreover, the collagen deposition increased with time inside the implant. In vivo, the scaffolds maintained the structural integrity. The degradation in vitro was faster and greater compared to that observed in vivo within the same time periods.
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Affiliation(s)
- Ana R Costa-Pinto
- 3B’s Research Group in Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- ICVS/3B’s, PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Ana M Martins
- 3B’s Research Group in Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- ICVS/3B’s, PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Magda J Castelhano-Carlos
- ICVS/3B’s, PT Government Associate Laboratory, Braga/Guimarães, Portugal
- Life and Health Sciences Research Institute (ICVS), Campus de Gualtar, Braga, Portugal
| | - Vitor M Correlo
- 3B’s Research Group in Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- ICVS/3B’s, PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Paula C Sol
- 3B’s Research Group in Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- ICVS/3B’s, PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Adhemar Longatto-Filho
- ICVS/3B’s, PT Government Associate Laboratory, Braga/Guimarães, Portugal
- Life and Health Sciences Research Institute (ICVS), Campus de Gualtar, Braga, Portugal
| | - Mrinal Battacharya
- Department of Biosystems Engineering, University of Minnesota, St Paul, MN, USA
| | - Rui L Reis
- 3B’s Research Group in Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- ICVS/3B’s, PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Nuno M Neves
- 3B’s Research Group in Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- ICVS/3B’s, PT Government Associate Laboratory, Braga/Guimarães, Portugal
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Kim KH, Lee CJ, Jo SA, Lee JH, Jang JE, Lee D, Kwon SY, Chung JW, Khang G. Preparation and Characterization of Zaltoprofen-Loaded Polyoxalate Microspheres for Control Release. POLYMER-KOREA 2013. [DOI: 10.7317/pk.2013.37.6.702] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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13
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Monteiro N, Martins A, Ribeiro D, Faria S, Fonseca NA, Moreira JN, Reis RL, Neves NM. On the use of dexamethasone-loaded liposomes to induce the osteogenic differentiation of human mesenchymal stem cells. J Tissue Eng Regen Med 2013; 9:1056-66. [PMID: 24123949 DOI: 10.1002/term.1817] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 07/24/2013] [Indexed: 11/12/2022]
Abstract
Stem cells have received considerable attention by the scientific community because of their potential for tissue engineering and regenerative medicine. The most frequently used method to promote their differentiation is supplementation of the in vitro culture medium with growth/differentiation factors (GDFs). The limitations of that strategy caused by the short half-life of GDFs limit its efficacy in vivo and consequently its clinical use. Thus, the development of new concepts that enable the bioactivity and bioavailability of GDFs to be protected, both in vitro and in vivo, is very relevant. Nanoparticle-based drug delivery systems can be injected, protect the GDFs and enable spatiotemporal release kinetics to be controlled. Liposomes are well-established nanodelivery devices presenting significant advantages, viz. a high load-carrying capacity, relative safety and easy production, and a versatile nature in terms of possible formulations and surface functionalization. The main objective of the present study was to optimize the formulation of liposomes to encapsulate dexamethasone (Dex). Our results showed that the optimized Dex-loaded liposomes do not have any cytotoxic effect on human bone marrow-derived mesenchymal stem cells (hBMSCs). More importantly, they were able to promote an earlier induction of differentiation of hBMSCs into the osteogenic lineage, as demonstrated by the expression of osteoblastic markers, both phenotypically and genotypically. We concluded that Dex-loaded liposomes represent a viable nanoparticle strategy with enhanced safety and efficacy for tissue engineering and regenerative medicine.
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Affiliation(s)
- Nelson Monteiro
- 3Bs Research Group - Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra S. Cláudio do Barco, 4806-909, Caldas das Taipas, Guimarães, Portugal.,ICVS/3Bs, PT Government Associated Laboratory, Braga, Guimarães, Portugal
| | - Albino Martins
- 3Bs Research Group - Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra S. Cláudio do Barco, 4806-909, Caldas das Taipas, Guimarães, Portugal.,ICVS/3Bs, PT Government Associated Laboratory, Braga, Guimarães, Portugal
| | - Diana Ribeiro
- 3Bs Research Group - Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra S. Cláudio do Barco, 4806-909, Caldas das Taipas, Guimarães, Portugal.,ICVS/3Bs, PT Government Associated Laboratory, Braga, Guimarães, Portugal
| | - Susana Faria
- Research Centre Officina Mathematical, Department of Mathematics for Science and Technology, University of Minho, Campus de Azurém, 4800-058, Guimarães, Portugal
| | - Nuno A Fonseca
- Centre for Neurosciences and Cell Biology (CNC), Faculty of Pharmacy of the University of Coimbra (FFUC), 3000, Coimbra, Portugal
| | - João N Moreira
- Centre for Neurosciences and Cell Biology (CNC), Faculty of Pharmacy of the University of Coimbra (FFUC), 3000, Coimbra, Portugal
| | - Rui L Reis
- 3Bs Research Group - Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra S. Cláudio do Barco, 4806-909, Caldas das Taipas, Guimarães, Portugal.,ICVS/3Bs, PT Government Associated Laboratory, Braga, Guimarães, Portugal
| | - Nuno M Neves
- 3Bs Research Group - Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra S. Cláudio do Barco, 4806-909, Caldas das Taipas, Guimarães, Portugal.,ICVS/3Bs, PT Government Associated Laboratory, Braga, Guimarães, Portugal
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14
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Sadiasa A, Kim MS, Lee BT. Poly(lactide-co-glycolide acid)/biphasic calcium phosphate composite coating on a porous scaffold to deliver simvastatin for bone tissue engineering. J Drug Target 2013; 21:719-29. [DOI: 10.3109/1061186x.2013.811512] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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15
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Christ GJ, Saul JM, Furth ME, Andersson KE. The pharmacology of regenerative medicine. Pharmacol Rev 2013; 65:1091-133. [PMID: 23818131 DOI: 10.1124/pr.112.007393] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Regenerative medicine is a rapidly evolving multidisciplinary, translational research enterprise whose explicit purpose is to advance technologies for the repair and replacement of damaged cells, tissues, and organs. Scientific progress in the field has been steady and expectations for its robust clinical application continue to rise. The major thesis of this review is that the pharmacological sciences will contribute critically to the accelerated translational progress and clinical utility of regenerative medicine technologies. In 2007, we coined the phrase "regenerative pharmacology" to describe the enormous possibilities that could occur at the interface between pharmacology, regenerative medicine, and tissue engineering. The operational definition of regenerative pharmacology is "the application of pharmacological sciences to accelerate, optimize, and characterize (either in vitro or in vivo) the development, maturation, and function of bioengineered and regenerating tissues." As such, regenerative pharmacology seeks to cure disease through restoration of tissue/organ function. This strategy is distinct from standard pharmacotherapy, which is often limited to the amelioration of symptoms. Our goal here is to get pharmacologists more involved in this field of research by exposing them to the tools, opportunities, challenges, and interdisciplinary expertise that will be required to ensure awareness and galvanize involvement. To this end, we illustrate ways in which the pharmacological sciences can drive future innovations in regenerative medicine and tissue engineering and thus help to revolutionize the discovery of curative therapeutics. Hopefully, the broad foundational knowledge provided herein will spark sustained conversations among experts in diverse fields of scientific research to the benefit of all.
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Affiliation(s)
- George J Christ
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27101, USA.
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16
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Santos TC, Morton TJ, Moritz M, Pfeifer S, Reise K, Marques AP, Castro AG, Reis RL, van Griensven M. Vascular Endothelial Growth Factor and Fibroblast Growth Factor-2 Incorporation in Starch-Based Bone Tissue-Engineered Constructs Promote theIn VivoExpression of Neovascularization Mediators. Tissue Eng Part A 2013; 19:834-48. [DOI: 10.1089/ten.tea.2010.0741] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Affiliation(s)
- Tírcia C. Santos
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Taipas, Guimarães, Portugal
- ICVS-3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Tatjana J. Morton
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Martina Moritz
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Sabine Pfeifer
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Kathrin Reise
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Alexandra P. Marques
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Taipas, Guimarães, Portugal
- ICVS-3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - António G. Castro
- ICVS-3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Braga, Portugal
| | - Rui L. Reis
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Taipas, Guimarães, Portugal
- ICVS-3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Martijn van Griensven
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
- Department of Trauma Surgery, Institute for Experimental Trauma Surgery, Technical University Munich, Munich, Germany
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17
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Zhang Z, Huang J, Jiang S, Liu Z, Gu W, Yu H, Li Y. Porous starch based self-assembled nano-delivery system improves the oral absorption of lipophilic drug. Int J Pharm 2013; 444:162-8. [DOI: 10.1016/j.ijpharm.2013.01.021] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 12/14/2012] [Accepted: 01/12/2013] [Indexed: 12/20/2022]
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18
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Cho YM, Lee HJ, Heo Y, Park SH, Seo SY, Han JH, Son TI. Enhancement of fibroblastic proliferation from photoreactive starch with immobilized epidermal growth factor. J Appl Polym Sci 2013. [DOI: 10.1002/app.38919] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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19
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Hermanová S, Omelková J, Voběrková S, Bálková R, Richtera L, Mravcová L, Jančář J. The Effect of Processing of Polycaprolactone Films on Degradation Process Initiated byAspergillus OryzaeLipase. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2012. [DOI: 10.1080/1023666x.2012.696402] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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20
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Alves A, Duarte ARC, Mano JF, Sousa RA, Reis RL. PDLLA enriched with ulvan particles as a novel 3D porous scaffold targeted for bone engineering. J Supercrit Fluids 2012. [DOI: 10.1016/j.supflu.2012.02.023] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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21
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22
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Bao TQ, Franco RA, Lee BT. Preparation and characterization of novel poly(ε-caprolactone)/biphasic calcium phosphate hybrid composite microspheres. J Biomed Mater Res B Appl Biomater 2011; 98:272-9. [DOI: 10.1002/jbm.b.31849] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Revised: 01/12/2011] [Accepted: 01/21/2011] [Indexed: 01/18/2023]
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23
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Martins AM, Saraf A, Sousa RA, Alves CM, Mikos AG, Kasper FK, Reis RL. Combination of enzymes and flow perfusion conditions improves osteogenic differentiation of bone marrow stromal cells cultured upon starch/poly(epsilon-caprolactone) fiber meshes. J Biomed Mater Res A 2010; 94:1061-9. [PMID: 20694973 DOI: 10.1002/jbm.a.32785] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Previous studies have shown that alpha-amylase and lipase are capable of enhancing the degradation of fiber meshes blends of starch and poly(epsilon-caprolactone) (SPCL) under dynamic conditions, and consequently to promote the proliferation and osteogenic differentiation of bone marrow stromal cells (MSCs). This study investigated the effect of flow perfusion bioreactor culture in combination with enzymes on the osteogenic differentiation of MSCs. SPCL fiber meshes were seeded with MSCs and cultured with osteogenic medium supplemented with alpha-amylase, lipase, or a combination of the two for 8 or 16 days using static or flow conditions. Lipase and its combination with alpha-amylase enhanced cell proliferation after 16 days. In addition, the flow perfusion culture enhanced the infiltration of cells and facilitated greater distribution of extracellular matrix (ECM) throughout the scaffolds in the presence/absence of enzymes. A significant amount of calcium was detected after 16 days in all groups cultured in flow conditions compared with static cultures. Nevertheless, when alpha-amylase and lipase were included in the flow perfusion cultures, the calcium content was 379 +/- 30 microg/scaffold after as few as 8 days. The highest calcium content (1271 +/- 32 microg/scaffold) was obtained for SPCL/cell constructs cultured for 16 days in the presence of lipase and flow. Furthermore, von Kossa staining and tetracycline fluorescence of histological sections demonstrated mineral deposition within the scaffolds for all groups cultured for 16 days under flow. However, all the data corroborate that lipase coupled with flow perfusion conditions improve the osteogenic differentiation of MSCs and enhance ECM mineralization.
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Affiliation(s)
- Ana M Martins
- University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Taipas, Guimarães, Portugal
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24
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Enzymatic degradation of 3D scaffolds of starch-poly-(ɛ-caprolactone) prepared by supercritical fluid technology. Polym Degrad Stab 2010. [DOI: 10.1016/j.polymdegradstab.2010.06.020] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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25
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da Silva MA, Martins A, Teixeira AA, Reis RL, Neves NM. Impact of biological agents and tissue engineering approaches on the treatment of rheumatic diseases. TISSUE ENGINEERING PART B-REVIEWS 2010; 16:331-9. [PMID: 20025434 DOI: 10.1089/ten.teb.2009.0536] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The treatment of rheumatic diseases has been the focus of many clinical studies aiming to achieve the best combination of drugs for symptom reduction. Although improved understanding of the pathophysiology of rheumatic diseases has led to the identification of effective therapeutic strategies, its cure remains unknown. Biological agents are a breakthrough in the treatment of these diseases. They proved to be more effective than the other conventional therapies in refractory inflammatory rheumatic diseases. Among them, tumor necrosis factor inhibitors are widely used, namely Etanercept, Infliximab, or Adalimumab, alone or in combination with disease-modifying antirheumatic drugs. Nevertheless, severe adverse effects have been detected in patients with history of recurrent infections, including cardiac failure or malignancy. Currently, most of the available therapies for rheumatic diseases do not have sufficient tissue specificity. Consequently, high drug doses must be administrated systemically, leading to adverse side effects associated with its possible toxicity. Drug delivery systems, by its targeted nature, are excellent solutions to overcome this problem. In this review, we will describe the state-of-the-art in clinical studies on the treatment of rheumatic diseases, emphasizing the use of biological agents and target drug delivery systems. Some alternative novel strategies of regenerative medicine and its implications for rheumatic diseases will also be discussed.
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26
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Osteogenic induction of hBMSCs by electrospun scaffolds with dexamethasone release functionality. Biomaterials 2010; 31:5875-85. [DOI: 10.1016/j.biomaterials.2010.04.010] [Citation(s) in RCA: 143] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Accepted: 04/05/2010] [Indexed: 11/21/2022]
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27
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Guimarães A, Martins A, Pinho ED, Faria S, Reis RL, Neves NM. Solving cell infiltration limitations of electrospun nanofiber meshes for tissue engineering applications. Nanomedicine (Lond) 2010; 5:539-54. [DOI: 10.2217/nnm.10.31] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: Utilize the dual composition strategy to increase the pore size and solve the low cell infiltration capacity on random nanofiber meshes, an intrinsic limitation of electrospun scaffolds for tissue engineering applications. Materials & methods: Polycaprolactone and poly(ethylene oxide) solutions were electrospun simultaneously to obtain a dual composition nanofiber mesh. Selective dissolution of the poly(ethylene oxide) nanofiber fraction was performed. The biologic performance of these enhanced pore size nanofibrous structures was assessed with human osteoblastic cells. Results: The electrospun nanofiber meshes, after the poly(ethylene oxide) dissolution, showed statistically significant larger pore sizes when compared with polycaprolactone nanofiber meshes with a similar polycaprolactone volume fraction. This was also confirmed by interferometric optical profilometry. Using scanning electron microscopy and laser scanning confocal microscopy, it was observed that osteoblastic cells could penetrate into the nanofibrous structure and migrate into the opposite and unseeded side of the mesh. Conclusion: An electrospun mesh was created with sufficient pore size to allow cell infiltration into its structure, thus resulting in a fully populated construct appropriate for 3D tissue engineering applications.
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Affiliation(s)
- Ana Guimarães
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
| | - Albino Martins
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
| | - Elisabete D Pinho
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
| | - Susana Faria
- Research Centre Officina Mathematica, Department of Mathematics for Science & Technology, University of Minho, Campus de Azurém, 4800–058 Guimarães, Portugal
| | - Rui L Reis
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
| | - Nuno M Neves
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
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Araújo MA, Cunha AM, Mota M. Changes on surface morphology of corn starch blend films. J Biomed Mater Res A 2010; 94:720-9. [DOI: 10.1002/jbm.a.32725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Balmayor ER, Feichtinger GA, Azevedo HS, van Griensven M, Reis RL. Starch-poly-epsilon-caprolactone microparticles reduce the needed amount of BMP-2. Clin Orthop Relat Res 2009; 467:3138-48. [PMID: 19557487 PMCID: PMC2772940 DOI: 10.1007/s11999-009-0954-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Accepted: 06/12/2009] [Indexed: 01/31/2023]
Abstract
BMP-2 is currently administered clinically using collagen matrices often requiring large amounts of BMP-2 due to burst release over a short period of time. We developed and tested a novel injectable drug delivery system consisting of starch-poly-epsilon-caprolactone microparticles for inducing osteogenesis and requiring smaller amounts of BMP-2. We evaluated BMP-2 encapsulation efficiency and the in vitro release profile by enzyme-linked immunosorbent assay. BMP-2 was rapidly released during the first 12 hours, followed by sustained release for up to 10 days. We then evaluated the osteogenic potential of dexamethasone (standard osteogenic induction agent) and BMP-2 after incorporation and during release using an osteo/myoblast cell line (C2C12). Alkaline phosphatase activity was increased by released BMP-2. Mineralization occurred after stimulation with BMP-2-loaded microparticles. A luciferase assay for osteocalcin promoter activity showed high levels of activity upon treatment with BMP-2-loaded microparticles. In contrast, no osteogenesis occurred in C2C12 cells using dexamethasone-loaded microparticles. However, human adipose stem cells exposed to the microparticles produced high amounts of alkaline phosphatase. The data suggest starch-poly-epsilon-caprolactone microparticles are suitable carriers for the incorporation and controlled release of glucocorticoids and growth factors. Specifically, they reduce the amount of BMP-2 needed and allow more sustained osteogenic effects.
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Affiliation(s)
- E R Balmayor
- 3B's Research Group-Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Headquarters of European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra, Caldas das Taipas, Guimarães, Portugal.
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Balmayor E, Tuzlakoglu K, Azevedo H, Reis R. Preparation and characterization of starch-poly-epsilon-caprolactone microparticles incorporating bioactive agents for drug delivery and tissue engineering applications. Acta Biomater 2009; 5:1035-45. [PMID: 19095509 DOI: 10.1016/j.actbio.2008.11.006] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 10/02/2008] [Accepted: 11/13/2008] [Indexed: 12/11/2022]
Abstract
One limitation associated with the delivery of bioactive agents concerns the short half-life of these molecules when administered intravenously, which results in their loss from the desired site. Incorporation of bioactive agents into depot vehicles provides a means to increase their persistence at the disease site. Major issues are involved in the development of a proper carrier system able to deliver the correct drug, at the desired dose, place and time. In this work, starch-poly-epsilon-caprolactone (SPCL) microparticles were developed for use in drug delivery and tissue engineering (TE) applications. SPCL microparticles were prepared by using an emulsion solvent extraction/evaporation technique, which was demonstrated to be a successful procedure to obtain particles with a spherical shape (particle size between 5 and 900 microm) and exhibiting different surface morphologies. Their chemical structure was confirmed by Fourier transform infrared spectroscopy. To evaluate the potential of the developed microparticles as a drug delivery system, dexamethasone (DEX) was used as model drug. DEX, a well-known component of osteogenic differentiation media, was entrapped into SPCL microparticles at different percentages up to 93%. The encapsulation efficiency was found to be dependent on the polymer concentration and drug-to-polymer ratio. The initial DEX release seems to be governed mainly by diffusion, and it is expected that the remaining DEX will be released when the polymeric matrix starts to degrade. In this work it was demonstrated that SPCL microparticles containing DEX can be successfully prepared and that these microparticular systems seem to be quite promising for controlled release applications, namely as carriers of important differentiation agents in TE.
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