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Lee J, Kim DH, Lee KJ, Seo IH, Park SH, Jang EH, Park Y, Youn YN, Ryu W. Transfer-molded wrappable microneedle meshes for perivascular drug delivery. J Control Release 2017; 268:237-246. [PMID: 29030224 DOI: 10.1016/j.jconrel.2017.10.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 09/11/2017] [Accepted: 10/06/2017] [Indexed: 12/27/2022]
Abstract
After surgical procedures such as coronary/peripheral bypass grafting or endarterectomy for the treatment of organ ischemia derived from atherosclerosis, intimal hyperplasia (IH) which leads to restenosis or occlusion at the site of graft anastomosis frequently occurs. In order to inhibit IH caused by abnormal growth of smooth muscle cells (SMCs) in tunica media, various perivascular drug delivery devices are reported for delivery of anti-proliferation drugs into vascular tissue. However, there still remain conflicting requirements such as local and unidirectional delivery vs device porosity, and conformal tight device installation vs pulsatile expansion and constriction of blood vessels. In this study, a biodegradable microneedle (MN) array is developed on a flexible woven surgical mesh using a transfer molding method. Mechanical properties of 'wrappable' MN meshes are investigated and compared to the properties of blood vessels. Ex vivo and in vivo animal studies demonstrate enhanced drug delivery efficiency, efficacy for IH reduction, and safety of MN mesh. In particular, MN mesh showed significantly reduced neointiamal formation (11.1%) compared to other competitive groups (23.7 and 22.2%) after 4-week in vivo animal study. Additionally, wrappable MN meshes effectively suppressed side effects such as IH due to mechanical constriction, loss of toxic drug to the surroundings, and cell death that were frequently observed with other previous perivascular drug delivery devices.
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Affiliation(s)
- JiYong Lee
- Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Dae-Hyun Kim
- Division of Cardiovascular Surgery, Severance Cardiovascular Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Kang Ju Lee
- Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Il Ho Seo
- Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Seung Hyun Park
- Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Eui Hwa Jang
- Division of Cardiovascular Surgery, Severance Cardiovascular Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Youngjoo Park
- Division of Cardiovascular Surgery, Severance Cardiovascular Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Young-Nam Youn
- Division of Cardiovascular Surgery, Severance Cardiovascular Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - WonHyoung Ryu
- Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
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Mylonaki I, Allémann É, Saucy F, Haefliger JA, Delie F, Jordan O. Perivascular medical devices and drug delivery systems: Making the right choices. Biomaterials 2017; 128:56-68. [PMID: 28288349 DOI: 10.1016/j.biomaterials.2017.02.028] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 02/13/2017] [Accepted: 02/26/2017] [Indexed: 12/31/2022]
Abstract
Perivascular medical devices and perivascular drug delivery systems are conceived for local application around a blood vessel during open vascular surgery. These systems provide mechanical support and/or pharmacological activity for the prevention of intimal hyperplasia following vessel injury. Despite abundant reports in the literature and numerous clinical trials, no efficient perivascular treatment is available. In this review, the existing perivascular medical devices and perivascular drug delivery systems, such as polymeric gels, meshes, sheaths, wraps, matrices, and metal meshes, are jointly evaluated. The key criteria for the design of an ideal perivascular system are identified. Perivascular treatments should have mechanical specifications that ensure system localization, prolonged retention and adequate vascular constriction. From the data gathered, it appears that a drug is necessary to increase the efficacy of these systems. As such, the release kinetics of pharmacological agents should match the development of the pathology. A successful perivascular system must combine these optimized pharmacological and mechanical properties to be efficient.
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Affiliation(s)
- Ioanna Mylonaki
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, rue Michel Servet 1, CH-1211 Geneva 4, Switzerland
| | - Éric Allémann
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, rue Michel Servet 1, CH-1211 Geneva 4, Switzerland
| | - François Saucy
- Department of Vascular Surgery, Lausanne University Hospital, rue du Bugnon 46, CH-1011 Lausanne, Switzerland
| | - Jacques-Antoine Haefliger
- Department of Vascular Surgery, Lausanne University Hospital, rue du Bugnon 46, CH-1011 Lausanne, Switzerland
| | - Florence Delie
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, rue Michel Servet 1, CH-1211 Geneva 4, Switzerland
| | - Olivier Jordan
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, rue Michel Servet 1, CH-1211 Geneva 4, Switzerland.
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3
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Zeki AA, Bratt JM, Chang KY, Franzi LM, Ott S, Silveria M, Fiehn O, Last JA, Kenyon NJ. Intratracheal instillation of pravastatin for the treatment of murine allergic asthma: a lung-targeted approach to deliver statins. Physiol Rep 2015; 3:3/5/e12352. [PMID: 25969462 PMCID: PMC4463814 DOI: 10.14814/phy2.12352] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Systemic treatment with statins mitigates allergic airway inflammation, TH2 cytokine production, epithelial mucus production, and airway hyperreactivity (AHR) in murine models of asthma. We hypothesized that pravastatin delivered intratracheally would be quantifiable in lung tissues using mass spectrometry, achieve high drug concentrations in the lung with minimal systemic absorption, and mitigate airway inflammation and structural changes induced by ovalbumin. Male BALB/c mice were sensitized to ovalbumin (OVA) over 4 weeks, then exposed to 1% OVA aerosol or filtered air (FA) over 2 weeks. Mice received intratracheal instillations of pravastatin before and after each OVA exposure (30 mg/kg). Ultra performance liquid chromatography – mass spectrometry was used to quantify plasma, lung, and bronchoalveolar lavage fluid (BALF) pravastatin concentration. Pravastatin was quantifiable in mouse plasma, lung tissue, and BALF (BALF > lung > plasma for OVA and FA groups). At these concentrations pravastatin inhibited airway goblet cell hyperplasia/metaplasia, and reduced BALF levels of cytokines TNFα and KC, but did not reduce BALF total leukocyte or eosinophil cell counts. While pravastatin did not mitigate AHR, it did inhibit airway hypersensitivity (AHS). In this proof-of-principle study, using novel mass spectrometry methods we show that pravastatin is quantifiable in tissues, achieves high levels in mouse lungs with minimal systemic absorption, and mitigates some pathological features of allergic asthma. Inhaled pravastatin may be beneficial for the treatment of asthma by having direct airway effects independent of a potent anti-inflammatory effect. Statins with greater lipophilicity may achieve better anti-inflammatory effects warranting further research.
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Affiliation(s)
- Amir A Zeki
- University of California, Davis, California Department of Internal Medicine, University of California, Davis, California Division of Pulmonary, Critical Care and Sleep Medicine, University of California, Davis, California Center for Comparative Respiratory Biology and Medicine (CCRBM) University of California, Davis, California
| | - Jennifer M Bratt
- University of California, Davis, California Department of Internal Medicine, University of California, Davis, California Division of Pulmonary, Critical Care and Sleep Medicine, University of California, Davis, California Center for Comparative Respiratory Biology and Medicine (CCRBM) University of California, Davis, California
| | | | - Lisa M Franzi
- University of California, Davis, California Department of Internal Medicine, University of California, Davis, California Division of Pulmonary, Critical Care and Sleep Medicine, University of California, Davis, California Center for Comparative Respiratory Biology and Medicine (CCRBM) University of California, Davis, California
| | - Sean Ott
- University of California, Davis, California Department of Internal Medicine, University of California, Davis, California Division of Pulmonary, Critical Care and Sleep Medicine, University of California, Davis, California Center for Comparative Respiratory Biology and Medicine (CCRBM) University of California, Davis, California
| | - Mark Silveria
- U.C. Davis, West Coast Metabolomics Center (WCMC) University of California, Davis, California
| | - Oliver Fiehn
- U.C. Davis, West Coast Metabolomics Center (WCMC) University of California, Davis, California King Abdulaziz University, Biochemistry Department, Jeddah, Saudi Arabia
| | - Jerold A Last
- University of California, Davis, California Department of Internal Medicine, University of California, Davis, California Division of Pulmonary, Critical Care and Sleep Medicine, University of California, Davis, California Center for Comparative Respiratory Biology and Medicine (CCRBM) University of California, Davis, California
| | - Nicholas J Kenyon
- University of California, Davis, California Department of Internal Medicine, University of California, Davis, California Division of Pulmonary, Critical Care and Sleep Medicine, University of California, Davis, California Center for Comparative Respiratory Biology and Medicine (CCRBM) University of California, Davis, California
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Gajanayake T, Olariu R, Leclere FM, Dhayani A, Yang Z, Bongoni AK, Banz Y, Constantinescu MA, Karp JM, Vemula PK, Rieben R, Vogelin E. A single localized dose of enzyme-responsive hydrogel improves long-term survival of a vascularized composite allograft. Sci Transl Med 2014; 6:249ra110. [DOI: 10.1126/scitranslmed.3008778] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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5
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Yu X, Takayama T, Goel SA, Shi X, Zhou Y, Kent KC, Murphy WL, Guo LW. A rapamycin-releasing perivascular polymeric sheath produces highly effective inhibition of intimal hyperplasia. J Control Release 2014; 191:47-53. [PMID: 24852098 DOI: 10.1016/j.jconrel.2014.05.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 04/30/2014] [Accepted: 05/08/2014] [Indexed: 01/02/2023]
Abstract
Intimal hyperplasia produces restenosis (re-narrowing) of the vessel lumen following vascular intervention. Drugs that inhibit intimal hyperplasia have been developed, however there is currently no clinical method of perivascular drug-delivery to prevent restenosis following open surgical procedures. Here we report a poly(ε-caprolactone) (PCL) sheath that is highly effective in preventing intimal hyperplasia through perivascular delivery of rapamycin. We first screened a series of bioresorbable polymers, i.e., poly(lactide-co-glycolide) (PLGA), poly(lactic acid) (PLLA), PCL, and their blends, to identify desired release kinetics and sheath physical properties. Both PLGA and PLLA sheaths produced minimal (<30%) rapamycin release within 50days in PBS buffer. In contrast, PCL sheaths exhibited more rapid and near-linear release kinetics, as well as durable integrity (>90days) as evidenced in both scanning electron microscopy and subcutaneous embedding experiments. Moreover, a PCL sheath deployed around balloon-injured rat carotid arteries was associated with a minimum rate of thrombosis compared to PLGA and PLLA. Morphometric analysis and immunohistochemistry revealed that rapamycin-loaded perivascular PCL sheaths produced pronounced (85%) inhibition of intimal hyperplasia (0.15±0.05 vs 1.01±0.16), without impairment of the luminal endothelium, the vessel's anti-thrombotic layer. Our data collectively show that a rapamycin-loaded PCL delivery system produces substantial mitigation of neointima, likely due to its favorable physical properties leading to a stable yet flexible perivascular sheath and steady and prolonged release kinetics. Thus, a PCL sheath may provide useful scaffolding for devising effective perivascular drug delivery particularly suited for preventing restenosis following open vascular surgery.
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Affiliation(s)
- Xiaohua Yu
- Department of Biomedical Engineering, University of Wisconsin, 5009 Wisconsin Institute of Medical Research, 1111 Highland Ave, Madison, WI, 53705, USA
| | - Toshio Takayama
- Department of Surgery, University of Wisconsin, 5151 Wisconsin Institute of Medical Research, 1111 Highland Ave, Madison, WI 53705, USA
| | - Shakti A Goel
- Department of Surgery, University of Wisconsin, 5151 Wisconsin Institute of Medical Research, 1111 Highland Ave, Madison, WI 53705, USA
| | - Xudong Shi
- Department of Surgery, University of Wisconsin, 5151 Wisconsin Institute of Medical Research, 1111 Highland Ave, Madison, WI 53705, USA
| | - Yifan Zhou
- Department of Surgery, University of Wisconsin, 5151 Wisconsin Institute of Medical Research, 1111 Highland Ave, Madison, WI 53705, USA
| | - K Craig Kent
- Department of Surgery, University of Wisconsin, 5151 Wisconsin Institute of Medical Research, 1111 Highland Ave, Madison, WI 53705, USA; Department of Surgery, University of Wisconsin Hospital and Clinics, 600 Highland Avenue, Madison, WI 53792, USA
| | - William L Murphy
- Department of Biomedical Engineering, University of Wisconsin, 5009 Wisconsin Institute of Medical Research, 1111 Highland Ave, Madison, WI, 53705, USA.
| | - Lian-Wang Guo
- Department of Surgery, University of Wisconsin, 5151 Wisconsin Institute of Medical Research, 1111 Highland Ave, Madison, WI 53705, USA.
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Tiwari R, Pathak K. Statins therapy: a review on conventional and novel formulation approaches. ACTA ACUST UNITED AC 2011; 63:983-98. [PMID: 21718281 DOI: 10.1111/j.2042-7158.2011.01273.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND AND OBJECTIVE High levels of cholesterol lead to atherosclerosis, a factor predisposing to the development of coronary artery disease. Statin drugs, i.e. HMG-CoA reductase inhibitors, have been known since the end of the last century for their benefits against cardio- and cerebrovascular diseases and are widely used clinically. This review aims at compiling the research inputs being made for developing therapeutically efficacious dosage forms that have the potential to surmount the limitations of conventional dosage forms of statins. KEY FINDINGS Statin drugs can reduce the endogenous synthesis of cholesterol and prevent the onset and development of atherosclerosis, and are therefore used as an effective treatment against primary hypercholesterolemia. At present, statin drugs are most often administered orally, on a daily basis. After administration, the bioavailability and the general circulation of statin drugs is fairly low due to the first-pass metabolism in the liver and clearance by the digestive system. Extensive pharmaceutical research in understanding the causes of low oral bioavailability has led to the development of novel technologies to address these challenges. SUMMARY These technologies vary from conventional dosage forms to nanoparticulate drug-delivery systems, and have the potential to cause improvements in bioavailability and consequently therapeutic efficacy.
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Affiliation(s)
- Radheshyam Tiwari
- Department of Pharmaceutics, Rajiv Academy for Pharmacy, Mathura, Uttar Pradesh, India
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7
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Yoon H, Kim G. A Three-Dimensional Polycaprolactone Scaffold Combined with a Drug Delivery System Consisting of Electrospun Nanofibers. J Pharm Sci 2011; 100:424-30. [DOI: 10.1002/jps.22310] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2010] [Revised: 05/11/2010] [Accepted: 06/29/2010] [Indexed: 12/26/2022]
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8
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Anirudhan TS, Sandeep S. Synthesis and characterization of molecularly imprinted polymer of N-maleoylchitosan-grafted-2-acrylamido-2-methylpropanesulfonic acid and its controlled delivery and recognition of bovine serum albumin. Polym Chem 2011. [DOI: 10.1039/c1py00059d] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kanjickal D, Lopina S, Evancho-Chapman MM, Schmidt S, Donovan D. Sustained local drug delivery from a novel polymeric ring to inhibit intimal hyperplasia. J Biomed Mater Res A 2010; 93:656-65. [PMID: 19610053 DOI: 10.1002/jbm.a.32307] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The long-term clinical success of autologous vein and synthetic vascular grafts are limited because of the development of anastomotic intimal hyperplasia (IH). We have previously published data suggesting that cyclosporine (CyA) may reduce the development of IH in a canine model (Hirko et al., J Vasc Surg 1993;17:877-887). However, systemic administration of CyA could create serious adverse effects. Therefore, it is our long-term goal to test the hypothesis that the controlled local release of CyA from a polymeric vascular wrap would prevent the development of IH. To test this hypothesis, we developed a controlled release polymeric ring that could be placed around anastomotic sites to deliver therapeutic drugs locally. The ring is a composite polymeric device consisting of poly(DL-lactide-co-glycolide) (PLGA) microspheres embedded in a poly(ethylene glycol) hydrogel. Several in vitro studies were conducted to evaluate the effects of different sterilization procedures on the properties of the device. It was determined that gamma sterilization was the preferred sterilization method of choice for this device. In vivo studies were conducted on a swine model to evaluate the biocompatibility of the ring. The histological findings of the ring implants at 2 and 4 weeks demonstrate the biocompatibility of this device.
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Affiliation(s)
- Deenu Kanjickal
- Department of Chemical Engineering, University of Akron, Akron, Ohio 44325, USA
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Li Y, Lee PI. A new bioerodible system for sustained local drug delivery based on hydrolytically activated in situ macromolecular association. Int J Pharm 2009; 383:45-52. [PMID: 19748559 DOI: 10.1016/j.ijpharm.2009.09.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2009] [Revised: 08/25/2009] [Accepted: 09/02/2009] [Indexed: 12/01/2022]
Abstract
To prolong the duration of polymer erosion over existing approaches for sustained local drug delivery, we investigated a new bioerodible system based on hydrolytically activated in situ formation of interpolymer complexes in binary blends of high MW poly(vinyl methyl ether-co-maleic anhydride) (PVMMA) and poly(ethylene oxide) (PEO). In an aqueous environment of use, the hydrophobic PVMMA component of the blend undergoes hydrolysis converting the anhydride to free carboxylic acid groups which in turn form in situ intermolecular complexes with the PEO component of the blend. The formation of such hydrogen-bonded complexes with a condensed structure at the blend surface helps to retard the further progression of polymer erosion and drug release. The effects of PVMMA/PEO composition on blend morphology, polymer erosion and drug release were evaluated with the aid of fluorescence labeled PVMMA. The results show a decrease in miscibility in PVMMA/PEO blend with increasing PEO content. At low PEO contents (below 40%), the in vitro rate of release of a model drug metronidazole decreases with increasing PEO content, resulting in extended release duration over several days. On the other hand, excessive phase separation at PEO contents above 40% gives rise to higher rate and shorter duration of drug release.
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Affiliation(s)
- Yan Li
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
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11
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Kanjickal D, Lopina S, Evancho-Chapman MM, Schmidt S, Inbaraj JJ, Cardon TB, Lorigan GA. Electron spin resonance studies of the effects of sterilization on poly(ethylene glycol) hydrogels. J Biomed Mater Res A 2009; 88:409-18. [DOI: 10.1002/jbm.a.31717] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Kanjickal D, Lopina S, Evancho-Chapman MM, Schmidt S, Donovan D. Effects of sterilization on poly(ethylene glycol) hydrogels. J Biomed Mater Res A 2009; 87:608-17. [PMID: 18186054 DOI: 10.1002/jbm.a.31811] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The past few decades have witnessed a dramatic increase in the development of polymeric biomaterials. These biomaterials have to undergo a sterilization procedure before implantation. However, many sterilization procedures have been shown to profoundly affect polymer properties. Poly(ethylene glycol) hydrogels have gained increasing importance in the controlled delivery of therapeutics and in tissue engineering. We evaluated the effect of ethylene oxide (EtO), hydrogen peroxide (H(2)O(2)), and gamma sterilization of poly(ethylene glycol) hydrogels on properties relevant to controlled drug delivery and tissue engineering. We observed that the release of cyclosporine (CyA) (an immunosuppressive drug that is effective in combating tissue rejection following organ transplantation) was significantly affected by the type of sterilization. However, that was not the case with rhodamine B, a dye. Hence, the drug release characteristics were observed to be dependent not only on the sterilization procedure but also on the type of agent that needs to be delivered. In addition, differences in the swelling ratios for the sterilized and unsterilized hydrogels were statistically significant for 1:1 crosslinked hydrogels derived from the 8000 MW polymer. Significant differences were also observed for gamma sterilization for 1:1 crosslinked hydrogels derived from the 3350 MW polymer and also the 2:1 crosslinked hydrogels derived from the 8000 MW polymer. Atomic force microscopy (AFM) studies revealed that the roughness parameter for the unsterilized and EtO-sterilized PEG hydrogels remained similar. However, a statistically significant reduction of the roughness parameter was observed for the H(2)O(2) and gamma-sterilized samples. Electron spin resonance (ESR) studies on the unsterilized and the sterilized samples revealed the presence of the peroxy and the triphenyl methyl carbon radical in the samples. The gamma and the H(2)O(2)-sterilized samples were observed to have a much higher concentration of the radical pecies when compared with the EtO and the unsterilized samples.
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Affiliation(s)
- Deenu Kanjickal
- University of Akron, Department of Chemical Engineering, Akron, Ohio 44325, USA
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13
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Moffat KL, Marra KG. Biodegradable poly(ethylene glycol) hydrogels crosslinked with genipin for tissue engineering applications. J Biomed Mater Res B Appl Biomater 2005; 71:181-7. [PMID: 15368243 DOI: 10.1002/jbm.b.30070] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In this study amino-terminated poly(ethylene glycol) (PEG-diamine) hydrogels were crosslinked with genipin, a chemical naturally derived from the gardenia fruit. Dissolution, swelling, and PEG-genipin release properties were determined. The dissolution studies indicated that the hydrogels are water soluble, and that the dissolution rate was concentration, mass, and temperature dependent. The dissolution rates are easily tailored from 3 min to >100 days. The PEG-genipin release study indicated that the greatest release occurs within the first 24 h of immersion in water, and that incubation at 37 degrees C elicits a greater initial release than samples incubated at room temperature for all genipin concentrations. Through scanning electron microscopy it was observed that the hydrogels are porous, and surface morphology changes before and after swelling. Furthermore, smooth muscle cell (SMC) adhesion studies indicated that the PEG-genipin hydrogel is a suitable substrate for SMC seeding. Overall, the results of these studies indicate that PEG-genipin hydrogels may provide potential scaffolding for a variety of tissue engineering applications.
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Affiliation(s)
- Kristen L Moffat
- Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, Pennsylvania 15213, USA
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Kanjickal D, Lopina S, Evancho-Chapman MM, Schmidt S, Donovan D. Improving delivery of hydrophobic drugs from hydrogels through cyclodextrins. J Biomed Mater Res A 2005; 74:454-60. [PMID: 15983991 DOI: 10.1002/jbm.a.30374] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A simple and effective technique of improving delivery of hydrophobic drugs from swellable systems is presented. Conventional methods of drug loading in hydrogel systems are limited by the characteristics of the pharmacological agent. The approach we present uses complexants to modulate drug release. Crosslinked poly(ethylene glycol) (PEG) hydrogels were synthesized, characterized, and used for vascular applications. The release of cyclosporine (CyA) from PEG hydrogels is significantly altered by the sterilization techniques. It was hypothesized that the release of CyA from PEG hydrogels can be modulated by using complexants. A cyclodextrin-CyA complex solution was prepared and used for drug loading. The sterilized PEG hydrogels that were loaded using the cyclodextrin-CyA complex solution had favorable release characteristics compared with the release from PEG hydrogels that were loaded using the conventional technique. Hence, drug release from swellable systems can be tailored by the application of this strategy.
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Affiliation(s)
- Deenu Kanjickal
- Department of Chemical Engineering, University of Akron, Akron, Ohio 44325, USA
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