1
|
Cho E, Qiao Y, Chen C, Xu J, Cai J, Li Y, Zhao J. Injectable FHE+BP composites hydrogel with enhanced regenerative capacity of tendon-bone interface for anterior cruciate ligament reconstruction. Front Bioeng Biotechnol 2023; 11:1117090. [PMID: 36911205 PMCID: PMC9996450 DOI: 10.3389/fbioe.2023.1117090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 02/14/2023] [Indexed: 02/25/2023] Open
Abstract
Features of black phosphorous (BP) nano sheets such as enhancing mineralization and reducing cytotoxicity in bone regeneration field have been reported. Thermo-responsive FHE hydrogel (mainly composed of oxidized hyaluronic acid (OHA), poly-ε-L-lysine (ε-EPL) and F127) also showed a desired outcome in skin regeneration due to its stability and antibacterial benefits. This study investigated the application of BP-FHE hydrogel in anterior cruciate ligament reconstruction (ACLR) both in in vitro and in vivo, and addressed its effects on tendon and bone healing. This BP-FHE hydrogel is expected to bring the benefits of both components (thermo-sensitivity, induced osteogenesis and easy delivery) to optimize the clinical application of ACLR and enhance the recovery. Our in vitro results confirmed the potential role of BP-FHE via significantly increased rBMSC attachment, proliferation and osteogenic differentiation with ARS and PCR analysis. Moreover, In vivo results indicated that BP-FHE hydrogels can successfully optimize the recovery of ACLR through enhancing osteogenesis and improving the integration of tendon and bone interface. Further results of Biomechanical testing and Micro-CT analysis [bone tunnel area (mm2) and bone volume/total volume (%)] demonstrated that BP can indeed accelerate bone ingrowth. Additionally, histological staining (H&E, Masson and Safranin O/fast green) and immunohistochemical analysis (COL I, COL III and BMP-2) strongly supported the ability of BP to promote tendon-bone healing after ACLR in murine animal models.
Collapse
Affiliation(s)
- Eunshinae Cho
- Department of Sports Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School Of Medicine, Shanghai, China
| | - Yi Qiao
- Department of Sports Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School Of Medicine, Shanghai, China
| | - Changan Chen
- Department of Sports Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School Of Medicine, Shanghai, China
| | - Junjie Xu
- Department of Sports Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School Of Medicine, Shanghai, China
| | - Jiangyu Cai
- Department of Sports Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School Of Medicine, Shanghai, China
| | - Yamin Li
- Department of Sports Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School Of Medicine, Shanghai, China
| | - Jinzhong Zhao
- Department of Sports Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School Of Medicine, Shanghai, China
| |
Collapse
|
2
|
Cojocaru FD, Balan V, Verestiuc L. Advanced 3D Magnetic Scaffolds for Tumor-Related Bone Defects. Int J Mol Sci 2022; 23:16190. [PMID: 36555827 PMCID: PMC9788029 DOI: 10.3390/ijms232416190] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 12/04/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022] Open
Abstract
The need for bone substitutes is a major challenge as the incidence of serious bone disorders is massively increasing, mainly attributed to modern world problems, such as obesity, aging of the global population, and cancer incidence. Bone cancer represents one of the most significant causes of bone defects, with reserved prognosis regarding the effectiveness of treatments and survival rate. Modern therapies, such as hyperthermia, immunotherapy, targeted therapy, and magnetic therapy, seem to bring hope for cancer treatment in general, and bone cancer in particular. Mimicking the composition of bone to create advanced scaffolds, such as bone substitutes, proved to be insufficient for successful bone regeneration, and a special attention should be given to control the changes in the bone tissue micro-environment. The magnetic manipulation by an external field can be a promising technique to control this micro-environment, and to sustain the proliferation and differentiation of osteoblasts, promoting the expression of some growth factors, and, finally, accelerating new bone formation. By incorporating stimuli responsive nanocarriers in the scaffold's architecture, such as magnetic nanoparticles functionalized with bioactive molecules, their behavior can be rigorously controlled under external magnetic driving, and stimulates the bone tissue formation.
Collapse
Affiliation(s)
| | | | - Liliana Verestiuc
- Biomedical Sciences Department, Faculty of Medical Bioengineering, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 9-13 Kogalniceanu Street, 700454 Iasi, Romania
| |
Collapse
|
3
|
Bio-Responsive Carriers for Controlled Delivery of Doxorubicin to Cancer Cells. Pharmaceutics 2022; 14:pharmaceutics14040865. [PMID: 35456699 PMCID: PMC9026771 DOI: 10.3390/pharmaceutics14040865] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 04/11/2022] [Accepted: 04/12/2022] [Indexed: 12/21/2022] Open
Abstract
The cellular internalization of drug carriers occurs via different endocytic pathways that ultimately involve the endosomes and the lysosomes, organelles where the pH value drops to 6.0 and 5.0, respectively. We aimed to design and characterize pH/temperature-responsive carriers for the effective delivery of the anti-tumoral drug doxorubicin. To this purpose, poly(N-isopropylacrylamide-co-vinylimidazole) was synthesized as an attractive pH/temperature-sensitive copolymer. Microspheres made of this copolymer, loaded with doxorubicin (MS-DXR), disintegrate in monodisperse nanospheres (NS-DXR) under conditions similar to that found in the bloodstream (pH = 7.4, temperature of 36 °C) releasing a small amount of payload. However, in environments that simulate the endosomal and lysosomal conditions, nanospheres solubilize, releasing the entire amount of drug. We followed the NS-DXR internalization using two cancer cell lines, hepatic carcinoma HepG2 cells and lung adenocarcinoma A549 cells. The data showed that NS-DXR are internalized to a greater extent by HepG2 cells than A549 cells, and this correlated with increased cytotoxicity induced by NS-DXR in HepG2 cells compared with A549 cells. Moreover, NS-DXR particles do not cause hemolysis and erythrocytes aggregation. Administered in vivo, NS-DXR localized in the liver and kidneys of mice, and the loading of DXR into NS resulted in the reduced renal clearance of DXR. In conclusion, the newly developed poly(N-isopropylacrylamide-co-vinyl imidazole) particles are biocompatible and may be introduced as carriers for doxorubicin to hepatic tumors.
Collapse
|
4
|
Intelligent micro-vehicles for drug transport and controlled release to cancer cells. REACT FUNCT POLYM 2021. [DOI: 10.1016/j.reactfunctpolym.2021.104961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
5
|
Pinteala M, Abadie MJM, Rusu RD. Smart Supra- and Macro-Molecular Tools for Biomedical Applications. MATERIALS 2020; 13:ma13153343. [PMID: 32727155 PMCID: PMC7435709 DOI: 10.3390/ma13153343] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 07/22/2020] [Accepted: 07/24/2020] [Indexed: 12/28/2022]
Abstract
Stimuli-responsive, “smart” polymeric materials used in the biomedical field function in a bio-mimicking manner by providing a non-linear response to triggers coming from a physiological microenvironment or other external source. They are built based on various chemical, physical, and biological tools that enable pH and/or temperature-stimulated changes in structural or physicochemical attributes, like shape, volume, solubility, supramolecular arrangement, and others. This review touches on some particular developments on the topic of stimuli-sensitive molecular tools for biomedical applications. Design and mechanistic details are provided concerning the smart synthetic instruments that are employed to prepare supra- and macro-molecular architectures with specific responses to external stimuli. Five major themes are approached: (i) temperature- and pH-responsive systems for controlled drug delivery; (ii) glycodynameric hydrogels for drug delivery; (iii) polymeric non-viral vectors for gene delivery; (iv) metallic nanoconjugates for biomedical applications; and, (v) smart organic tools for biomedical imaging.
Collapse
Affiliation(s)
- Mariana Pinteala
- “Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Grigore Ghica Voda Alley, 41A, 700487 Iasi, Romania; (M.P.); (M.J.M.A.)
| | - Marc J. M. Abadie
- “Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Grigore Ghica Voda Alley, 41A, 700487 Iasi, Romania; (M.P.); (M.J.M.A.)
- Institute Charles Gerhardt Montpellier, Bat 15, CC 1052, University of Montpellier, 34095 Montpellier, France
| | - Radu D. Rusu
- “Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Grigore Ghica Voda Alley, 41A, 700487 Iasi, Romania; (M.P.); (M.J.M.A.)
- Correspondence: ; Tel.: +40-232-217454
| |
Collapse
|
6
|
Constantin M, Bucatariu S, Ascenzi P, Butnaru M, Fundueanu G. Smart drug delivery system activated by specific biomolecules. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 108:110466. [PMID: 31923948 DOI: 10.1016/j.msec.2019.110466] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 09/30/2019] [Accepted: 11/17/2019] [Indexed: 10/25/2022]
Abstract
Essentially, the human body can release in different disease conditions specific biomolecules such as histamines when the body encounters a toxic substance, antibodies which are part of the body's natural immune response or nitric oxide as a cardiovascular signalling molecule. Design and development of "intelligent" delivery systems able to release the therapeutic agent only in the presence of bioactive compounds was presented here. Poly(N-isopropylacrylamide-co-N-(3-aminopropyl)methacrylamide)) (poly(NIPAAm-co-APM)) was synthesized as an exciting pH/temperature sensitive copolymer. Under physiological conditions (pH = 7.4), the APM in copolymer is in the ionized state (pKa = 8.7), highly hydrophilic and therefore the copolymer loses thermosensitive properties. Remarkably, after electrostatic interactions of APM with specific biomolecules, the copolymer restores the thermosensitive property. Thus, the microgels synthesized from this copolymer are in the "inactivated" state at normal physiological pH and temperature (pH = 7.4 and T = 36 °C). In the presence of specific biomolecules, microgels undergo "activation", shrink and expel mechanically a certain amount of drug. It must be mentioned that the pH-sensitive component plays the role of a biosensor, the biomolecule acts as a triggering agent, and the poly(NIPAAm) represents the delivery component (actuator). MTT tests showed that poly(NIPAAm-co-APM) microspheres are completely devoid of toxicity; moreover, the rabbit dermal fibroblasts vastly adhere to the surface of microspheres.
Collapse
Affiliation(s)
- Marieta Constantin
- Department of Natural Polymers, Bioactive and Biocompatible Materials, "Petru Poni" Institute of Macromolecular Chemistry, 700487 Iassy, Romania
| | - Sanda Bucatariu
- Department of Natural Polymers, Bioactive and Biocompatible Materials, "Petru Poni" Institute of Macromolecular Chemistry, 700487 Iassy, Romania
| | - Paolo Ascenzi
- Interdepartmental Laboratory for Electron Microscopy, University Roma Tre, I-00146 Roma, Italy
| | - Maria Butnaru
- Faculty of Medical Bioengineering, "Gr. T. Popa" University of Medicine and Pharmacy, 16 University Street, 700115 Iassy, Romania
| | - Gheorghe Fundueanu
- Department of Natural Polymers, Bioactive and Biocompatible Materials, "Petru Poni" Institute of Macromolecular Chemistry, 700487 Iassy, Romania.
| |
Collapse
|
7
|
Aghebati-Maleki A, Dolati S, Ahmadi M, Baghbanzhadeh A, Asadi M, Fotouhi A, Yousefi M, Aghebati-Maleki L. Nanoparticles and cancer therapy: Perspectives for application of nanoparticles in the treatment of cancers. J Cell Physiol 2019; 235:1962-1972. [PMID: 31441032 DOI: 10.1002/jcp.29126] [Citation(s) in RCA: 188] [Impact Index Per Article: 37.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 05/29/2019] [Indexed: 12/12/2022]
Abstract
Rapid growth in nanotechnology toward the development of nanomedicine agents holds massive promise to improve therapeutic approaches against cancer. Nanomedicine products represent an opportunity to achieve sophisticated targeting strategies and multifunctionality. Nowadays, nanoparticles (NPs) have multiple applications in different branches of science. In recent years, NPs have repetitively been reported to play a significant role in modern medicine. They have been analyzed for different clinical applications, such as drug carriers, gene delivery to tumors, and contrast agents in imaging. A wide range of nanomaterials based on organic, inorganic, lipid, or glycan compounds, as well as on synthetic polymers has been utilized for the development and improvement of new cancer therapeutics. In this study, we discuss the role of NPs in treating cancer among different drug delivery methods for cancer therapy.
Collapse
Affiliation(s)
- Ali Aghebati-Maleki
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sanam Dolati
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Majid Ahmadi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Amir Baghbanzhadeh
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Milad Asadi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ali Fotouhi
- Department of Orthopedic Surgery, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mehdi Yousefi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Leili Aghebati-Maleki
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| |
Collapse
|
8
|
Porcu EP, Salis A, Rassu G, Maestri M, Galafassi J, Bruni G, Giunchedi P, Gavini E. Engineered polymeric microspheres obtained by multi-step method as potential systems for transarterial embolization and intraoperative imaging of HCC: Preliminary evaluation. Eur J Pharm Biopharm 2017; 117:160-167. [DOI: 10.1016/j.ejpb.2017.04.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 04/06/2017] [Accepted: 04/11/2017] [Indexed: 12/11/2022]
|
9
|
Lu XJ, Yang XY, Meng Y, Li SZ. Temperature and pH dually-responsive poly(β-amino ester) nanoparticles for drug delivery. CHINESE JOURNAL OF POLYMER SCIENCE 2017. [DOI: 10.1007/s10118-017-1916-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
10
|
Fabrication of pluronic and methylcellulose for etidronate delivery and their application for osteogenesis. Int J Pharm 2015; 499:110-118. [PMID: 26748362 DOI: 10.1016/j.ijpharm.2015.12.070] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 12/09/2015] [Accepted: 12/27/2015] [Indexed: 11/23/2022]
Abstract
Novel hydrogels were prepared by blending 4% (w/w) methylcellulose (MC) with various concentrations of 12, 14, 16, 18 and 20% (w/w) pluronic F127 (PF) to form injectable implant drug delivery systems. The blends formed gels using lower concentrations of PF compared to when using PF alone. Etidronate sodium (EDS) at a concentration of 4×10(-3)M was loaded into these blends for producing an osteogenesis effect. The pure gels or EDS loaded gels exhibited cytocompatibility to both the osteoblast (MC3T3-E1) and myoblast (C2C12) cell lines whereas the gels of 16PF, 18PF and 20PF were very cytotoxic to the cells. The EDS loaded gels demonstrated significantly greater alkaline phosphatase (ALP) activities compared to the pure gels. The longer exposure time periods of the samples to the cells, the greater was the ALP activity. These EDS loaded gels significantly increased proliferation of both cell lines thus indicating a bone regeneration effect. The PF/MC blends prolonged the in vitro release of EDS for more than 28 days. Based on the in vitro degradation test, the MC extensively improved the gel strength of the PF and delayed the degradation of the gels thus making them more functional for a sustained drug delivery for osteogenesis.
Collapse
|
11
|
Thermoresponsive hydrogels in biomedical applications. Eur J Pharm Biopharm 2015; 97:338-49. [DOI: 10.1016/j.ejpb.2015.05.017] [Citation(s) in RCA: 321] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 05/07/2015] [Accepted: 05/21/2015] [Indexed: 11/21/2022]
|
12
|
Walmsley GG, McArdle A, Tevlin R, Momeni A, Atashroo D, Hu MS, Feroze AH, Wong VW, Lorenz PH, Longaker MT, Wan DC. Nanotechnology in bone tissue engineering. NANOMEDICINE : NANOTECHNOLOGY, BIOLOGY, AND MEDICINE 2015; 11:1253-63. [PMID: 25791811 PMCID: PMC4476906 DOI: 10.1016/j.nano.2015.02.013] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 11/23/2014] [Accepted: 02/21/2015] [Indexed: 02/04/2023]
Abstract
Nanotechnology represents a major frontier with potential to significantly advance the field of bone tissue engineering. Current limitations in regenerative strategies include impaired cellular proliferation and differentiation, insufficient mechanical strength of scaffolds, and inadequate production of extrinsic factors necessary for efficient osteogenesis. Here we review several major areas of research in nanotechnology with potential implications in bone regeneration: 1) nanoparticle-based methods for delivery of bioactive molecules, growth factors, and genetic material, 2) nanoparticle-mediated cell labeling and targeting, and 3) nano-based scaffold construction and modification to enhance physicochemical interactions, biocompatibility, mechanical stability, and cellular attachment/survival. As these technologies continue to evolve, ultimate translation to the clinical environment may allow for improved therapeutic outcomes in patients with large bone deficits and osteodegenerative diseases. FROM THE CLINICAL EDITOR Traditionally, the reconstruction of bony defects has relied on the use of bone grafts. With advances in nanotechnology, there has been significant development of synthetic biomaterials. In this article, the authors provided a comprehensive review on current research in nanoparticle-based therapies for bone tissue engineering, which should be useful reading for clinicians as well as researchers in this field.
Collapse
Affiliation(s)
- Graham G Walmsley
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA; Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Adrian McArdle
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA; Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Ruth Tevlin
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Arash Momeni
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - David Atashroo
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Michael S Hu
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Abdullah H Feroze
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Victor W Wong
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Peter H Lorenz
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Michael T Longaker
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA; Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Derrick C Wan
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA.
| |
Collapse
|
13
|
Poole KM, Nelson CE, Joshi RV, Martin JR, Gupta MK, Haws SC, Kavanaugh TE, Skala MC, Duvall CL. ROS-responsive microspheres for on demand antioxidant therapy in a model of diabetic peripheral arterial disease. Biomaterials 2015; 41:166-75. [PMID: 25522975 PMCID: PMC4274772 DOI: 10.1016/j.biomaterials.2014.11.016] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 10/29/2014] [Accepted: 11/07/2014] [Indexed: 02/07/2023]
Abstract
A new microparticle-based delivery system was synthesized from reactive oxygen species (ROS)-responsive poly(propylene sulfide) (PPS) and tested for "on demand" antioxidant therapy. PPS is hydrophobic but undergoes a phase change to become hydrophilic upon oxidation and thus provides a useful platform for ROS-demanded drug release. This platform was tested for delivery of the promising anti-inflammatory and antioxidant therapeutic molecule curcumin, which is currently limited in use in its free form due to poor pharmacokinetic properties. PPS microspheres efficiently encapsulated curcumin through oil-in-water emulsion and provided sustained, on demand release that was modulated in vitro by hydrogen peroxide concentration. The cytocompatible, curcumin-loaded microspheres preferentially targeted and scavenged intracellular ROS in activated macrophages, reduced in vitro cell death in the presence of cytotoxic levels of ROS, and decreased tissue-level ROS in vivo in the diabetic mouse hind limb ischemia model of peripheral arterial disease. Interestingly, due to the ROS scavenging behavior of PPS, the blank microparticles also showed inherent therapeutic properties that were synergistic with the effects of curcumin in these assays. Functionally, local delivery of curcumin-PPS microspheres accelerated recovery from hind limb ischemia in diabetic mice, as demonstrated using non-invasive imaging techniques. This work demonstrates the potential for PPS microspheres as a generalizable vehicle for ROS-demanded drug release and establishes the utility of this platform for improving local curcumin bioavailability for treatment of chronic inflammatory diseases.
Collapse
Affiliation(s)
- Kristin M Poole
- Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235-1631, USA
| | - Christopher E Nelson
- Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235-1631, USA
| | - Rucha V Joshi
- Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235-1631, USA
| | - John R Martin
- Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235-1631, USA
| | - Mukesh K Gupta
- Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235-1631, USA
| | - Skylar C Haws
- Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235-1631, USA
| | - Taylor E Kavanaugh
- Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235-1631, USA
| | - Melissa C Skala
- Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235-1631, USA
| | - Craig L Duvall
- Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235-1631, USA.
| |
Collapse
|
14
|
Preparation of thermo- and pH-responsive star copolymers via ATRP and its use in drug release application. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-014-3436-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
15
|
David G, Fundueanu G, Pinteala M, Minea B, Dascalu A, Simionescu BC. Polymer engineering for drug/gene delivery: from simple towards complex architectures and hybrid materials. PURE APPL CHEM 2014. [DOI: 10.1515/pac-2014-0708] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The paper summarizes the history of the drug/gene delivery domain, pointing on polymers as a solution to specific challenges, and outlines the current situation in the field – focusing on the newest strategies intended to improve systems effectiveness and responsiveness (design keys, preparative approaches). Some recent results of the authors are briefly presented.
Collapse
|
16
|
Fuciños C, Fuciños P, Pastrana LM, Rúa ML. Functional Characterization of Poly(N-isopropylacrylamide) Nanohydrogels for the Controlled Release of Food Preservatives. FOOD BIOPROCESS TECH 2014. [DOI: 10.1007/s11947-014-1351-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
17
|
Fuciños C, Fuciños P, Míguez M, Katime I, Pastrana LM, Rúa ML. Temperature- and pH-sensitive nanohydrogels of poly(N-Isopropylacrylamide) for food packaging applications: modelling the swelling-collapse behaviour. PLoS One 2014; 9:e87190. [PMID: 24520326 PMCID: PMC3919826 DOI: 10.1371/journal.pone.0087190] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Accepted: 12/20/2013] [Indexed: 12/02/2022] Open
Abstract
Temperature-sensitive poly(N-isopropylacrylamide) (PNIPA) nanohydrogels were synthesized by nanoemulsion polymerization in water-in-oil systems. Several cross-linking degrees and the incorporation of acrylic acid as comonomer at different concentrations were tested to produce nanohydrogels with a wide range of properties. The physicochemical properties of PNIPA nanohydrogels, and their relationship with the swelling-collapse behaviour, were studied to evaluate the suitability of PNIPA nanoparticles as smart delivery systems (for active packaging). The swelling-collapse transition was analyzed by the change in the optical properties of PNIPA nanohydrogels using ultraviolet-visible spectroscopy. The thermodynamic parameters associated with the nanohydrogels collapse were calculated using a mathematical approach based on the van't Hoff analysis, assuming a two-state equilibrium (swollen to collapsed). A mathematical model is proposed to predict both the thermally induced collapse, and the collapse induced by the simultaneous action of two factors (temperature and pH, or temperature and organic solvent concentration). Finally, van't Hoff analysis was compared with differential scanning calorimetry. The results obtained allow us to solve the problem of determining the molecular weight of the structural repeating unit in cross-linked NIPA polymers, which, as we show, can be estimated from the ratio of the molar heat capacity (obtained from the van't Hoff analysis) to the specific heat capacity (obtained from calorimetric measurements).
Collapse
Affiliation(s)
- Clara Fuciños
- Grupo de Bioquímica, Departamento de Química Analítica y Alimentaria, Universidad de Vigo, Ourense, Spain
| | - Pablo Fuciños
- Grupo de Reciclado y Valorización de Materiales Residuales (REVAL), Instituto de Investigaciones Marinas (CSIC), Vigo, Spain
| | - Martín Míguez
- Grupo de Bioquímica, Departamento de Química Analítica y Alimentaria, Universidad de Vigo, Ourense, Spain
| | - Issa Katime
- Grupo de Nuevos Materiales y Espectroscopía Supramolecular, Departamento de Química Física, Universidad del País Vasco, Leioa, Spain
| | - Lorenzo M. Pastrana
- Grupo de Bioquímica, Departamento de Química Analítica y Alimentaria, Universidad de Vigo, Ourense, Spain
| | - María L. Rúa
- Grupo de Bioquímica, Departamento de Química Analítica y Alimentaria, Universidad de Vigo, Ourense, Spain
| |
Collapse
|
18
|
Li C, Wang G, Gao H, Zhai M, Li J. Temperature-, pH-, and ion-stimulus-responsive swelling behaviors of poly(dimethylaminoethyl methacrylate) gel containing cholic acid. J Appl Polym Sci 2013. [DOI: 10.1002/app.39998] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Cancan Li
- School of Materials and Engineering; University of Science and Technology Beijing; Beijing 100083 China
- Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry; College of Chemistry and Molecular Engineering, Peking University; Beijing 100871 China
| | - Guojie Wang
- School of Materials and Engineering; University of Science and Technology Beijing; Beijing 100083 China
| | - Hongyi Gao
- School of Materials and Engineering; University of Science and Technology Beijing; Beijing 100083 China
| | - Maolin Zhai
- Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry; College of Chemistry and Molecular Engineering, Peking University; Beijing 100871 China
| | - Jiuqiang Li
- Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry; College of Chemistry and Molecular Engineering, Peking University; Beijing 100871 China
| |
Collapse
|
19
|
Ferrari R, Rooney TR, Lupi M, Ubezio P, Hutchinson RA, Moscatelli D. A Methyl Methacrylate-HEMA-CL
n
Copolymerization Investigation: From Kinetics to Bioapplications. Macromol Biosci 2013; 13:1347-57. [DOI: 10.1002/mabi.201300152] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 05/10/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Raffaele Ferrari
- Department of Chemistry; Materials and Chemical Engineering “Giulio Natta”; Politecnico di Milano Via Luigi Mancinelli 7, 20131 Milano Italy
| | - Thomas R. Rooney
- Department of Chemical Engineering; Dupuis Hall; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Monica Lupi
- Department of Oncology; Istituto di Ricerche Farmacologiche “Mario Negri” - IRCCS; Via La Masa 19, 20156 Milano Italy
| | - Paolo Ubezio
- Department of Oncology; Istituto di Ricerche Farmacologiche “Mario Negri” - IRCCS; Via La Masa 19, 20156 Milano Italy
| | - Robin A. Hutchinson
- Department of Chemical Engineering; Dupuis Hall; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Davide Moscatelli
- Department of Chemistry; Materials and Chemical Engineering “Giulio Natta”; Politecnico di Milano Via Luigi Mancinelli 7, 20131 Milano Italy
| |
Collapse
|
20
|
Joshi RV, Nelson CE, Poole KM, Skala MC, Duvall CL. Dual pH- and temperature-responsive microparticles for protein delivery to ischemic tissues. Acta Biomater 2013; 9:6526-34. [PMID: 23402764 PMCID: PMC3702271 DOI: 10.1016/j.actbio.2013.01.041] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 01/10/2013] [Accepted: 01/29/2013] [Indexed: 01/10/2023]
Abstract
Injectable "smart" microspheres that are sensitive to both temperature and pH have been fabricated and tested for controlled delivery of therapeutic proteins to ischemic skeletal muscle. A library of copolymers composed of N-isopropyl acrylamide (NIPAAm), propyl acrylic acid (PAA), and butyl acrylate (BA) was used to fabricate microspheres using a double emulsion method, and an optimal formulation made from copolymers composed of 57 mol.% NIPAAm, 18 mol.% PAA and 25 mol.% BA copolymers was identified. At 37°C and pH representative of ischemic muscle (i.e. pH 5.2-7.2), these microspheres produced sustained, diffusion-controlled release, and at normal, physiological pH (i.e. pH 7.4), they underwent dissolution and rapid clearance. Delivery of fibroblast growth factor 2 was used to confirm that protein bioactivity was retained following microsphere encapsulation/release based on a dose-dependent increase in NIH3T3 fibroblast proliferation in vitro. Microsphere-loaded or free Cy5.5-labeled albumin was injected into ischemic and control gastrocnemii of mice following unilateral induction of hind limb ischemia to model peripheral arterial disease. In the ischemic limb at days 3.5 and 7, there was higher local retention of the protein delivered via microspheres relative to injected free protein (p<0.05). However, clearance of protein delivered via microspheres was equivalent to free protein at later time points that correspond to ischemic recovery in this model. Finally, histological analysis of the gastrocnemius revealed that the polymeric microspheres did not produce any microscopic signs of toxicity near the injection site. These combined results suggest that the pH- and temperature-responsive microspheres presented herein are a promising technological platform for controlled protein delivery to ischemic tissue.
Collapse
|
21
|
Hanafi A, Nograles N, Abdullah S, Shamsudin MN, Rosli R. Cellulose Acetate Phthalate Microencapsulation and Delivery of Plasmid DNA to the Intestines. J Pharm Sci 2013. [DOI: 10.1002/jps.23389] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
22
|
Fonseca AC, Ferreira P, Cordeiro RA, Mendonça PV, Góis JR, Gil MH, Coelho JFJ. Drug Delivery Systems for Predictive Medicine: Polymers as Tools for Advanced Applications. NEW STRATEGIES TO ADVANCE PRE/DIABETES CARE: INTEGRATIVE APPROACH BY PPPM 2013. [DOI: 10.1007/978-94-007-5971-8_16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
23
|
Fundueanu G, Constantin M, Asmarandei I, Harabagiu V, Ascenzi P, Simionescu BC. The thermosensitivity of pH/thermoresponsive microspheres activated by the electrostatic interaction of pH-sensitive units with a bioactive compound. J Biomed Mater Res A 2012. [PMID: 23184700 DOI: 10.1002/jbm.a.34469] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
pH/thermosensitive hydrogels whose thermosensitivity is activated by the electrostatic interaction of the pH-sensitive units with a hydrophobic bioactive compound are proposed here as sensor-based self-regulated drug delivery systems. Poly(N-isopropylacrylamide-co-acrylamide-co-aminoethylacrylamide) (poly(NIPAAm-co-AAm-co-AEAAm)) was prepared as a new pH/thermoresponsive polymer by hydrolysis of poly(N-isopropylacrylamide-co-acrylamide (poly(NIPAAm-co-AAm)) at high temperature (120°C) in the presence of ethylenediamine. Owing to the hydrophilicity of the inserted amine, the copolymers lose the thermosensitivity at physiological temperature and have a slow-phase transition at temperatures much higher than that of the human body. However, when the positively charged amine groups of the pH-sensitive units bind electrostatically with the negatively charged drug diclofenac, the copolymers retrieve the thermosensitivity. Poly(NIPAAm-co-AAm-co-AEAAm) was transformed into pH/thermoresponsive stable microspheres by an original approach based on crosslinking of the amine groups of aminoethylacrylamide (AEAAm) with glutaraldehyde at a temperature slightly below the lower critical solution temperature. The swelling/deswelling processes of microspheres occur only after the interaction of poly(NIPAAm-co-AAm-co-AEAAm) with the negatively charged drug diclofenac. The pH/temperature-sensitive microgels and dicofenac act as sensors and as the triggering agent, respectively. Conductometric titration reveals that the thermosensitivity of poly(NIPAAm-co-AAm-co-AEAAm) is retrieved when just half of its amino groups are complexed with diclofenac.
Collapse
Affiliation(s)
- Gheorghe Fundueanu
- Department of Bioactive and Biocompatible Polymers, Petru Poni Institute of Macromolecular Chemistry, Iasi 700487, Romania.
| | | | | | | | | | | |
Collapse
|
24
|
Jones DS, Andrews GP, Caldwell DL, Lorimer C, Gorman SP, McCoy CP. Novel semi-interpenetrating hydrogel networks with enhanced mechanical properties and thermoresponsive engineered drug delivery, designed as bioactive endotracheal tube biomaterials. Eur J Pharm Biopharm 2012; 82:563-71. [PMID: 22940251 DOI: 10.1016/j.ejpb.2012.07.019] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2011] [Revised: 07/16/2012] [Accepted: 07/27/2012] [Indexed: 11/17/2022]
Abstract
Thermoresponsive polymeric platforms are used to optimise drug delivery in pharmaceutical systems and bioactive medical devices. However, the practical application of these systems is compromised by their poor mechanical properties. This study describes the design of thermoresponsive semi-interpenetrating polymer networks (s-IPNs) based on cross-linked p(NIPAA) or p(NIPAA-co-HEMA) hydrogels containing poly(ε-caprolactone) designed to address this issue. Using DSC, the lower critical solution temperature of the co-polymer and p(NIPAA) matrices were circa 34°C and 32°C, respectively. PCL was physically dispersed within the hydrogel matrices as confirmed using confocal scanning laser microscopy and DSC and resulted in marked changes in the mechanical properties (ultimate tensile strength, Young's modulus) without adversely compromising the elongation properties. P(NIPAA) networks containing dispersed PCL exhibited thermoresponsive swelling properties following immersion in buffer (pH 7), with the equilibrium-swelling ratio being greater at 20°C than 37°C and greatest for p(NIPAA)/PCL systems at 20°C. The incorporation of PCL significantly lowered the equilibrium swelling ratio of the various networks but this was not deemed practically significant for s-IPNs based on p(NIPAA). Thermoresponsive release of metronidazole was observed from s-IPN composed of p(NIPAA)/PCL at 37°C but not from p(NIPAA-co-HEMA)/PCL at this temperature. In all other platforms, drug release at 20°C was significantly similar to that at 37°C and was diffusion controlled. This study has uniquely described a strategy by which thermoresponsive drug release may be performed from polymeric platforms with highly elastic properties. It is proposed that these materials may be used clinically as bioactive endotracheal tubes, designed to offer enhanced resistance to ventilator associated pneumonia, a clinical condition associated with the use of endotracheal tubes where stimulus responsive drug release from biomaterials of significant mechanical properties would be advantageous.
Collapse
Affiliation(s)
- David S Jones
- School of Pharmacy, Queen's University of Belfast, Northern Ireland, United Kingdom.
| | | | | | | | | | | |
Collapse
|
25
|
Fundueanu G, Constantin M, Oanea I, Harabagiu V, Ascenzi P, Simionescu BC. Prediction of the appropriate size of drug molecules that could be released by a pulsatile mechanism from pH/thermoresponsive microspheres obtained from preformed polymers. Acta Biomater 2012; 8:1281-9. [PMID: 21945634 DOI: 10.1016/j.actbio.2011.09.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Revised: 08/13/2011] [Accepted: 09/01/2011] [Indexed: 11/17/2022]
Abstract
Preparation of cross-linked pH/thermoresponsive microspheres from preformed polymers is still lacking in literature since copolymers possessing both temperature- and pH-sensitive units together with a cross-linkable moiety in appropriate ratios are required. Moreover, choosing of the appropriate drugs able to be loaded and then released in a pulsatile manner is randomly performed. Here, we report the synthesis of pH/thermoresponsive cross-linked microspheres based on N-isopropylacrylamide and N-alloc-ethylenediamine. A chromatographic method was developed to predict the appropriate size of drug molecules that could be loaded and then released in a pulsatile manner. Accordingly, it was established that common drugs (salicylic acid, benzoic acid, nicotinic acid, lidocaine and diclofenac), with molecular weights ranging between 100 and 1000 g mol(-1), could be loaded and released in a pulsatile manner. Biologic molecules with higher molecular weights (heparin, lysozyme and bovine serum albumin) are completely excluded from the pores of cross-linked pH/thermoresponsive microspheres both below and above the volume phase transition temperature.
Collapse
Affiliation(s)
- Gheorghe Fundueanu
- Department of Bioactive and Biocompatible Polymers, "Petru Poni" Institute of Macromolecular Chemistry, 700487 Iassy, Romania.
| | | | | | | | | | | |
Collapse
|
26
|
Sarti F, Iqbal J, Müller C, Shahnaz G, Rahmat D, Bernkop-Schnürch A. Poly(acrylic acid)–cysteine for oral vitamin B12 delivery. Anal Biochem 2012; 420:13-9. [DOI: 10.1016/j.ab.2011.08.039] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 08/16/2011] [Accepted: 08/22/2011] [Indexed: 10/17/2022]
|
27
|
Wang H, Leeuwenburgh SCG, Li Y, Jansen JA. The use of micro- and nanospheres as functional components for bone tissue regeneration. TISSUE ENGINEERING PART B-REVIEWS 2011; 18:24-39. [PMID: 21806489 DOI: 10.1089/ten.teb.2011.0184] [Citation(s) in RCA: 110] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
During the last decade, the use of micro- and nanospheres as functional components for bone tissue regeneration has drawn increasing interest. Scaffolds comprising micro- and nanospheres display several advantages compared with traditional monolithic scaffolds that are related to (i) an improved control over sustained delivery of therapeutic agents, signaling biomolecules and even pluripotent stem cells, (ii) the introduction of spheres as stimulus-sensitive delivery vehicles for triggered release, (iii) the use of spheres to introduce porosity and/or improve the mechanical properties of bulk scaffolds by acting as porogen or reinforcement phase, (iv) the use of spheres as compartmentalized microreactors for dedicated biochemical processes, (v) the use of spheres as cell delivery vehicle, and, finally, (vi) the possibility of preparing injectable and/or moldable formulations to be applied by using minimally invasive surgery. This article focuses on recent developments with regard to the use of micro- and nanospheres for bone regeneration by categorizing micro-/nanospheres by material class (polymers, ceramics, and composites) as well as summarizing the main strategies that employ these spheres to improve the functionality of scaffolds for bone tissue engineering.
Collapse
Affiliation(s)
- Huanan Wang
- Department of Biomaterials, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | | | | | | |
Collapse
|
28
|
Thermoresponsive, in situ cross-linkable hydrogels based on N-isopropylacrylamide: fabrication, characterization and mesenchymal stem cell encapsulation. Acta Biomater 2011; 7:1460-7. [PMID: 21187170 DOI: 10.1016/j.actbio.2010.12.027] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 12/08/2010] [Accepted: 12/20/2010] [Indexed: 01/05/2023]
Abstract
Hydrogels that solidify in response to a dual, physical and chemical, mechanism upon temperature increase were fabricated and characterized. The hydrogels were based on N-isopropylacrylamide, which renders them thermoresponsive, and contained covalently cross-linkable moieties in the macromers. The effects of the macromer end group, acrylate or methacrylate, and the fabrication conditions on the degradative and swelling properties of the hydrogels were investigated. The hydrogels exhibited higher swelling below their lower critical solution temperature (LCST). When immersed in cell culture medium at physiological temperature, which was above their LCST, hydrogels showed constant swelling and no degradation over 8 weeks, with the methacrylated hydrogels showing greater swelling than their acrylated analogs. In addition, hydrogels immersed in cell culture medium under the same conditions showed lower swelling compared with phosphate-buffered saline. The interplay between chemical cross-linking and thermally induced phase separation affected the swelling characteristics of the hydrogels in different media. Mesenchymal stem cells encapsulated in the hydrogels in vitro were viable over 3 weeks and markers of osteogenic differentiation were detected when the cells were cultured with osteogenic supplements. Hydrogel mineralization in the absence of cells was observed in cell culture medium with the addition of fetal bovine serum and β-glycerol phosphate. The results suggest that these hydrogels may be suitable as carriers for cell delivery in tissue engineering.
Collapse
|
29
|
Liu TY, Huang HH, Chen YJ, Chen YJ. Study of a novel ultrasonically triggered drug vehicle with magnetic resonance properties. Acta Biomater 2011; 7:578-84. [PMID: 20854938 DOI: 10.1016/j.actbio.2010.09.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Revised: 09/10/2010] [Accepted: 09/15/2010] [Indexed: 11/18/2022]
Abstract
We developed a novel ultrasonically triggered drug vehicle with magnetic resonance (MR) properties by encapsulating superparamagnetic iron oxide (SPIO) nanoparticles in hydroxyapatite (HA)-coated liposomes. The effects of HA coating on the background leakage, ultrasound response and MR signal were investigated. HA coating of liposomes significantly reduced the background leakage of liposome. It also enhanced their sensitivity to ultrasound regardless of HA thickness or ultrasound frequency, even under sonication conditions of high frequency (1 and 3 MHz) and low power density (0.2-0.4 Wcm(-2)) used for diagnosis. However, it was found that the ultrasonically triggered vehicle could exhibit T(2) contrast in MR images by encapsulating SPIO. However, HA coating reduced the r(2) value of SPIO encapsulated in liposomes, but had no significant effect on the r(2)(∗) value, implying that MR images of HA-coated liposomes encapsulating SPIO could be probed by the T(2)(∗) signal. Most importantly, the r(2)(∗)-r(2) value of HA-coated liposomes encapsulating SPIO decreased after sonication, suggesting that the proposed vehicle could be used not only as a MR-guided drug vehicle capable of ultrasonically triggered release but also as a MR reporter to probe ultrasonic triggering.
Collapse
Affiliation(s)
- Tse-Ying Liu
- Institute of Biomedical Engineering, National Yang-Ming University, 155, Sec. 2, Lih-Nong Street, Taipei, Taiwan, ROC.
| | | | | | | |
Collapse
|
30
|
You JO, Almeda D, Ye GJC, Auguste DT. Bioresponsive matrices in drug delivery. J Biol Eng 2010; 4:15. [PMID: 21114841 PMCID: PMC3002303 DOI: 10.1186/1754-1611-4-15] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Accepted: 11/29/2010] [Indexed: 02/10/2023] Open
Abstract
For years, the field of drug delivery has focused on (1) controlling the release of a therapeutic and (2) targeting the therapeutic to a specific cell type. These research endeavors have concentrated mainly on the development of new degradable polymers and molecule-labeled drug delivery vehicles. Recent interest in biomaterials that respond to their environment have opened new methods to trigger the release of drugs and localize the therapeutic within a particular site. These novel biomaterials, usually termed "smart" or "intelligent", are able to deliver a therapeutic agent based on either environmental cues or a remote stimulus. Stimuli-responsive materials could potentially elicit a therapeutically effective dose without adverse side effects. Polymers responding to different stimuli, such as pH, light, temperature, ultrasound, magnetism, or biomolecules have been investigated as potential drug delivery vehicles. This review describes the most recent advances in "smart" drug delivery systems that respond to one or multiple stimuli.
Collapse
Affiliation(s)
- Jin-Oh You
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Dariela Almeda
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - George JC Ye
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Debra T Auguste
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| |
Collapse
|