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Increasing levels of insulin secretion in bioartificial pancreas technology: co-encapsulation of beta cells and nanoparticles containing GLP-1 in alginate hydrogels. HEALTH AND TECHNOLOGY 2020. [DOI: 10.1007/s12553-020-00427-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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2
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Ahadian S, Sadeghian RB, Salehi S, Ostrovidov S, Bae H, Ramalingam M, Khademhosseini A. Bioconjugated Hydrogels for Tissue Engineering and Regenerative Medicine. Bioconjug Chem 2015; 26:1984-2001. [DOI: 10.1021/acs.bioconjchem.5b00360] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Samad Ahadian
- WPI-Advanced
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Ramin Banan Sadeghian
- WPI-Advanced
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Sahar Salehi
- WPI-Advanced
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Serge Ostrovidov
- WPI-Advanced
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Hojae Bae
- College
of Animal Bioscience and Technology, Department of Bioindustrial Technologies, Konkuk University, Hwayang-dong,
Kwangjin-gu, Seoul 143-701, Republic of Korea
| | - Murugan Ramalingam
- WPI-Advanced
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- Centre
for Stem Cell Research, Institute for Stem Cell Biology and Regenerative Medicine, Christian Medical College Campus, Vellore 632002, India
| | - Ali Khademhosseini
- WPI-Advanced
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- College
of Animal Bioscience and Technology, Department of Bioindustrial Technologies, Konkuk University, Hwayang-dong,
Kwangjin-gu, Seoul 143-701, Republic of Korea
- Department
of Medicine, Center for Biomedical Engineering, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts 02115, United States
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3
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Prado AD, Navarro R, Gallardo A, Elvira C, Reinecke H. Synthesis of randomly aminated polyvinylpyrrolidone and its use in the preparation of hydrolyzable conjugates. RSC Adv 2014. [DOI: 10.1039/c4ra05354k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Preparation of side-aminated polyvinylpyrrolidones and their potential application as pH-sensitive drug-conjugate carriers.
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Affiliation(s)
- Anselmo del Prado
- Instituto de Ciencia y Tecnología de Polímeros
- ICTP-CSIC
- 28006 Madrid, Spain
| | - Rodrigo Navarro
- Instituto de Ciencia y Tecnología de Polímeros
- ICTP-CSIC
- 28006 Madrid, Spain
| | - Alberto Gallardo
- Instituto de Ciencia y Tecnología de Polímeros
- ICTP-CSIC
- 28006 Madrid, Spain
| | - Carlos Elvira
- Instituto de Ciencia y Tecnología de Polímeros
- ICTP-CSIC
- 28006 Madrid, Spain
| | - Helmut Reinecke
- Instituto de Ciencia y Tecnología de Polímeros
- ICTP-CSIC
- 28006 Madrid, Spain
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4
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Tardajos MG, García-Fernández L, Reinecke H, Aguilar MR, Gallardo A, Román JS. Microstructure and biological activity of sulfonated N-vinylpyrrolidone copolymers. J BIOACT COMPAT POL 2012. [DOI: 10.1177/0883911512457761] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This article deals with the preparation, characterization, and in vitro evaluation of new copolymers based on functionalized N-vinylpyrrolidone bearing pendant sulfonic acid groups statistically or alternately distributed in the macromolecular chains. Statistical copolymers were obtained by free radical polymerization of N-vinylpyrrolidone and sulfonated N-vinylpyrrolidone ( r VP = 1.61; r VPSulf = 0.90) in water, and alternating copolymers were synthesized by free radical polymerization of N-vinylpyrrolidone or sulfonated N-vinylpyrrolidone with methyl maleate in N,N-dimethylformamide followed by hydrolysis of the resulting copolymers. The influence of these new materials on acidic fibroblast growth factor–mediated mitogenesis of fibroblasts demonstrated that sequence distribution (copolymer microstructure) plays a key role in the biological performance of these polymers. Alternating copolymers did not present biological activity, whereas statistical copolymers inhibited acidic fibroblast growth factor activity in a sulfonated N-vinylpyrrolidone dose-dependent manner.
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Affiliation(s)
- Myriam G Tardajos
- Polymer Functionalization Group, Polymer Physics, Elastomers and Energy Department, Polymer Science and Technology Institute (ICTP-CSIC), Madrid, Spain
| | - Luis García-Fernández
- Biomaterials Group, Polymeric Nanomaterials and Biomaterials Department, Polymer Science and Technology Institute (ICTP-CSIC), Madrid, Spain
- Networking Biomedical Research Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Zaragoza, Spain
| | - Helmut Reinecke
- Polymer Functionalization Group, Polymer Physics, Elastomers and Energy Department, Polymer Science and Technology Institute (ICTP-CSIC), Madrid, Spain
| | - María R Aguilar
- Biomaterials Group, Polymeric Nanomaterials and Biomaterials Department, Polymer Science and Technology Institute (ICTP-CSIC), Madrid, Spain
- Networking Biomedical Research Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Zaragoza, Spain
| | - Alberto Gallardo
- Polymer Functionalization Group, Polymer Physics, Elastomers and Energy Department, Polymer Science and Technology Institute (ICTP-CSIC), Madrid, Spain
| | - Julio S Román
- Biomaterials Group, Polymeric Nanomaterials and Biomaterials Department, Polymer Science and Technology Institute (ICTP-CSIC), Madrid, Spain
- Networking Biomedical Research Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Zaragoza, Spain
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5
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Khan S, Sur S, Newcomb CJ, Appelt EA, Stupp SI. Self-assembling glucagon-like peptide 1-mimetic peptide amphiphiles for enhanced activity and proliferation of insulin-secreting cells. Acta Biomater 2012; 8:1685-92. [PMID: 22342354 DOI: 10.1016/j.actbio.2012.01.036] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Revised: 01/26/2012] [Accepted: 01/31/2012] [Indexed: 02/07/2023]
Abstract
Current treatment for type 1 diabetes mellitus requires daily insulin injections that fail to produce physiological glycemic control. Islet cell transplantation has been proposed as a permanent cure but is limited by loss of β-cell viability and function. These limitations could potentially be overcome by relying on the activity of glucagon-like peptide 1 (GLP-1), which acts on β-cells to promote insulin release, proliferation and survival. We have developed a peptide amphiphile (PA) molecule incorporating a peptide mimetic for GLP-1. This GLP-1-mimetic PA self-assembles into one-dimensional nanofibers that stabilize the active secondary structure of GLP-1 and can be cross-linked by calcium ions to form a macroscopic gel capable of cell encapsulation and three-dimensional culture. The GLP-1-mimetic PA nanofibers were found to stimulate insulin secretion from rat insulinoma (RINm5f) cells to a significantly greater extent than the mimetic peptide alone and to a level equivalent to that of the clinically used agonist exendin-4. The activity of the GLP-1-mimetic PA is glucose-dependent, lipid-raft dependent and partially PKA-dependent consistent with native GLP-1. The GLP-1-mimetic PA also completely abrogates inflammatory cytokine-induced cell death to the level of untreated controls. When used as a PA gel to encapsulate RINm5f cells, the GLP-1-mimetic PA stimulates insulin secretion and proliferation in a cytokine-resistant manner that is significantly greater than a non-bioactive PA gel containing exendin-4. Due to its self-assembling property and bioactivity, the GLP-1-mimetic PA can be incorporated into previously developed islet cell transplantation protocols with the potential for significant enhancement of β-cell viability and function.
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6
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Tardajos MG, Nash M, Rochev Y, Reinecke H, Elvira C, Gallardo A. Homologous Copolymerization Route to Functional and Biocompatible Polyvinylpyrrolidone. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201100564] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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7
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O'Sullivan ES, Vegas A, Anderson DG, Weir GC. Islets transplanted in immunoisolation devices: a review of the progress and the challenges that remain. Endocr Rev 2011; 32:827-44. [PMID: 21951347 PMCID: PMC3591674 DOI: 10.1210/er.2010-0026] [Citation(s) in RCA: 153] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The concept of using an immunoisolation device to facilitate the transplantation of islets without the need for immunosuppression has been around for more than 50 yr. Significant progress has been made in developing suitable materials that satisfy the need for biocompatibility, durability, and permselectivity. However, the search is ongoing for a device that allows sufficient oxygen transfer while maintaining a barrier to immune cells and preventing rejection of the transplanted tissue. Separating the islets from the rich blood supply in the native pancreas takes its toll. The immunoisolated islets commonly suffer from hypoxia and necrosis, which in turn triggers a host immune response. Efforts have been made to improve the supply of nutrients by using proangiogenic factors to augment the development of a vascular supply in the transplant site, by using small islet cell aggregates to reduce the barrier to diffusion of oxygen, or by creating scaffolds that are in close proximity to a vascular network such as the omental blood supply. Even if these efforts are successful, the shortage of donor islet tissue available for transplantation remains a major problem. To this end, a search for a renewable source of insulin-producing cells is ongoing; whether these will come from adult or embryonic stem cells or xenogeneic sources remains to be seen. Herein we will review the above issues and chart the progress made with various immunoisolation devices in small and large animal models and the small number of clinical trials carried out to date.
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Affiliation(s)
- Esther S O'Sullivan
- Section on Islet Transplantation and Cell Biology, Research Division, Joslin Diabetes Center and the Department of Medicine, Harvard Medical School, Boston, Massachusetts 02215, USA
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8
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Cheng JYC, Raghunath M, Whitelock J, Poole-Warren L. Matrix components and scaffolds for sustained islet function. TISSUE ENGINEERING PART B-REVIEWS 2011; 17:235-47. [PMID: 21476869 DOI: 10.1089/ten.teb.2011.0004] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The clinical treatment of diabetes by islet transplantation is limited by low islet survival rates. A fundamental reason for this inefficiency is likely due to the removal of islets from their native environment. The isolation process not only disrupts interactions between blood vessels and endocrine cells, but also dramatically changes islet cell interaction with the extracellular matrix (ECM). Biomolecular cues from the ECM are important for islet survival, proliferation, and function; however, very little is known about the composition of islet ECM and the role each component plays. Without a thorough understanding of islet ECM, current endeavors to prolong islet survival via scaffold engineering lack a systematic basis. The following article reviews current knowledge of islet ECM and attempts to explain the roles they play in islet function. In addition, the effects of in vitro simulations of the native islet scaffold will be evaluated. Greater understanding in these areas will provide a preliminary platform from which a sustainable bioartificial pancreas may be developed.
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Affiliation(s)
- Jennifer Y C Cheng
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, Australia.
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9
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Vaithilingam V, Tuch BE. Islet transplantation and encapsulation: an update on recent developments. Rev Diabet Stud 2011; 8:51-67. [PMID: 21720673 DOI: 10.1900/rds.2011.8.51] [Citation(s) in RCA: 125] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Human islet transplantation can provide good glycemic control in diabetic recipients without exogenous insulin. However, a major factor limiting its application is the recipient's need to adhere to life-long immunosuppression, something that has serious side effects. Microencapsulating human islets is a strategy that should prevent rejection of the grafted tissue without the need for anti-rejection drugs. Despite promising studies in various animal models, the encapsulated human islets so far have not made an impact in the clinical setting. Many non-immunological and immunological factors such as biocompatibility, reduced immunoprotection, hypoxia, pericapsular fibrotic overgrowth, effects of the encapsulation process and post-transplant inflammation hamper the successful application of this promising technology. In this review, strategies are discussed to overcome the above-mentioned factors and to enhance the survival and function of encapsulated insulin-producing cells, whether in islets or surrogate β-cells. Studies at our center show that barium alginate microcapsules are biocompatible in rodents, but not in humans, raising concerns over the use of rodents to predict outcomes. Studies at our center also show that the encapsulation process had little or no effect on the cellular transcriptome of human islets and on their ability to function either in vitro or in vivo. New approaches incorporating further modifications to the microcapsule surface to prevent fibrotic overgrowth are vital, if encapsulated human islets or β-cell surrogates are to become a viable therapy option for type 1 diabetes in humans.
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10
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Jabbari E. Bioconjugation of hydrogels for tissue engineering. Curr Opin Biotechnol 2011; 22:655-60. [PMID: 21306888 DOI: 10.1016/j.copbio.2011.01.003] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2011] [Accepted: 01/18/2011] [Indexed: 02/02/2023]
Abstract
Success of tissue engineered constructs in regenerative medicine is limited by the lack of cellmatrix interactions to guide devleopment of the seeded cells into the desired tissue. This review highlights the most exciting developments in bioconjugation of synthetic hydrogels targeted to tissue engineering. Application of conjugation techniques has resulted in the synthesis of novel biomimetic cell-responsive hydrogels to control the cascade of cell migration, adhesion, survival, differentiation, and maturation to the desired lineage concurrent with matrix remodeling. The future outlook includes developing conjugated patterned hydrogel matrices, developing novel hydrogel matrices to support self-renewal and pluripotency of embryonic and adult stem cells, and merging 3D printing with bioconjugation to fabricate hydrogels with anatomical arrangement of cells and biomolecules.
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Affiliation(s)
- Esmaiel Jabbari
- Biomimetic Materials and Tissue Engineering Laboratory, Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, USA.
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11
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Kizilel S, Scavone A, Liu X, Nothias JM, Ostrega D, Witkowski P, Millis M. Encapsulation of pancreatic islets within nano-thin functional polyethylene glycol coatings for enhanced insulin secretion. Tissue Eng Part A 2010; 16:2217-28. [PMID: 20163204 DOI: 10.1089/ten.tea.2009.0640] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Covalent attachment of polymers to cells and tissues could be used to solve a variety of problems associated with cellular therapies. Insulin-dependent diabetes mellitus is a disease resulting from the autoimmune destruction of the beta cells of the islets of Langerhans in the pancreas. Transplantation of islets into diabetic patients is an attractive form of treatment, provided that the islets could be protected from the host's immune system to prevent graft rejection, and smaller numbers of islets transplanted in smaller volumes could be sufficient to reverse diabetes. Therefore, a need exists to develop islet encapsulation strategies that minimize transplant volume. In this study, we demonstrate the formation of nano-thin, poly(ethylene glycol) (PEG)-rich functional conformal coatings on individual islets via layer-by-layer assembly technique. The surface of the islets is modified with biotin-PEG-N-hydroxysuccinimide (NHS), and the islets are further covered by streptavidin (SA) and biotin-PEG-peptide conjugates using the layer-by-layer method. An insulinotropic ligand, glucagon-like peptide-1 (GLP-1), is conjugated to biotin-PEG-NHS. The insulinotropic effect of GLP-1 is investigated through layer-by-layer encapsulation of islets using the biotin-PEG-GLP-1 conjugate. The effect of islet surface modification using the biotin-PEG-GLP-1 conjugate on insulin secretion in response to glucose challenge is compared via static incubation and dynamic perifusion assays. The results show that islets coated with the functional PEG conjugate are capable of secreting more insulin in response to high glucose levels compared to control islets. Finally, the presence of SA is confirmed by indirect fluorescent staining with SA-Cy3, and the presence of PEG-peptide on the surface of the islets after treatment with biotin-PEG-GLP-1 is confirmed by indirect fluorescent staining with biotin-PEG-fluorescein isothiocyanate (FITC) and separately with an anti-GLP-1 antibody. This work demonstrates the feasibility of treating pancreatic islets with reactive polymeric segments and provides the foundation for a novel means of potential immunoisolation. With this technique, it may be possible to encapsulate and/or modify islets before portal vein transplantation and reduce transplantation volume significantly, and promote islet viability and insulin secretion due to the presence of insulinotropic peptides on the islet surface. Layer-by-layer self-assembly of PEG-GLP-1 offers a unique approach to islet encapsulation to stimulate insulin secretion in response to high glucose levels.
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Affiliation(s)
- Seda Kizilel
- Department of Chemical and Biological Engineering, College of Engineering, Koç University, Istanbul, Turkey.
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Lin CC, Anseth KS. Glucagon-like peptide-1 functionalized PEG hydrogels promote survival and function of encapsulated pancreatic beta-cells. Biomacromolecules 2009; 10:2460-7. [PMID: 19586041 PMCID: PMC2745231 DOI: 10.1021/bm900420f] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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Encapsulating pancreatic islets in a semipermeable poly(ethylene glycol) (PEG) hydrogel membrane holds potential as an immuno-isolation barrier for the treatment of type 1 diabetes mellitus. The semipermeable PEG hydrogel not only permits free diffusion of nutrients, metabolic waste, and insulin produced from the encapsulated β-cells, but also provides a size-exclusion effect to prevent direct contact of entrapped islets to host immune cells and antibodies. However, the use of unmodified PEG hydrogels for islet encapsulation is not ideal, as there is no bioactive cue to promote the long-term survival and function of the encapsulated cells. Herein, we report the synthesis and characterization of a bioactive glucagon-like peptide 1 (GLP-1) analog, namely, GLP-1-cysteine or GLP-1C, and the fabrication of functional GLP-1 immobilized PEG hydrogels via a facile thiol−acrylate photopolymerization. The immobilization of bioactive GLP-1C within PEG hydrogels is efficient and does not alter the bulk hydrogel properties. Further, the GLP-1 immobilized PEG hydrogels enhance the survival and insulin secretion of encapsulated islets. Overall, this study demonstrates a strategy to modify PEG hydrogels with bioactive peptide moieties that can significantly enhance the efficacy of islet encapsulation.
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Affiliation(s)
- Chien-Chi Lin
- Department of Chemical and Biological Engineering and Howard Hughes Medical Institute, University of Colorado, 424 UCB, Boulder, Colorado 80309, USA
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Pérez Perrino M, Navarro R, Gómez Tardajos M, Gallardo A, Reinecke H. “One-pot” Synthesis of 1-Vinyl-2-pyrrolidone with Protic Functional Groups in 3-Position. MACROMOL CHEM PHYS 2009. [DOI: 10.1002/macp.200900306] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kang HC, Bae YH. Transfection of insulin-secreting cell line and rat islets by functional polymeric gene vector. Biomaterials 2009; 30:2837-45. [DOI: 10.1016/j.biomaterials.2009.01.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2009] [Accepted: 01/19/2009] [Indexed: 12/01/2022]
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Chae SY, Chun YG, Lee S, Jin CH, Lee ES, Lee KC, Youn YS. Pharmacokinetic and pharmacodynamic evaluation of site-specific PEGylated glucagon-like peptide-1 analogs as flexible postprandial-glucose controllers. J Pharm Sci 2009; 98:1556-67. [DOI: 10.1002/jps.21532] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Sweet IR, Yanay O, Waldron L, Gilbert M, Fuller JM, Tupling T, Lernmark A, Osborne WRA. Treatment of diabetic rats with encapsulated islets. J Cell Mol Med 2008; 12:2644-50. [PMID: 18373735 PMCID: PMC3828880 DOI: 10.1111/j.1582-4934.2008.00322.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Immunoprotection of islets using bioisolator systems permits introduction of allogeneic cells to diabetic patients without the need for immunosuppression. Using TheraCyte™ immunoisolation devices, we investigated two rat models of type 1 diabetes mellitus (T1DM), BB rats and rats made diabetic by streptozotocin (STZ) treatment. We chose to implant islets after the onset of diabetes to mimic the probable treatment of children with T1DM as they are usually diagnosed after disease onset. We encapsulated 1000 rat islets and implanted them subcutaneously (SQ) into diabetic biobreeding (BB) rats and STZ-induced diabetic rats, defined as two or more consecutive days of blood glucose >350 mg/dl. Rats were monitored for weight and blood glucose. Untreated BB rats rapidly lost weight and were euthanized at >20% weight loss that occurred between 4 and 10 days from implantation. For period of 30–40 days following islet implantation weights of treated rats remained steady or increased. Rapid weight loss occurred after surgical removal of devices that contained insulin positive islets. STZ-treated rats that received encapsulated islets showed steady weight gain for up to 130 days, whereas untreated control rats showed steady weight loss that achieved >20% at around 55 days. Although islet implants did not normalize blood glucose, treated rats were apparently healthy and groomed normally. Autologous or allogeneic islets were equally effective in providing treatment. TheraCyte™ devices can sustain islets, protect allogeneic cells from immune attack and provide treatment for diabetic-mediated weight loss in both BB rats and STZ-induced diabetic rats.
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Affiliation(s)
- Ian R Sweet
- Department of Medicine, University of Washington, Seattle, WA 98195, USA
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Chae SY, Jin CH, Shin HJ, Youn YS, Lee S, Lee KC. Preparation, Characterization, and Application of Biotinylated and Biotin−PEGylated Glucagon-Like Peptide-1 Analogues for Enhanced Oral Delivery. Bioconjug Chem 2007; 19:334-41. [DOI: 10.1021/bc700292v] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Su Young Chae
- Drug Targeting Laboratory, College of Pharmacy, SungKyunKwan University, 300 Chonchon-dong, Jangan-ku, Suwon City 440–746, Korea, College of Pharmacy, Pusan National University, Busan 609–735, Korea, and Biomedical Research Center, Korea Institute of Science and Technology, Seoul 136–791, Korea
| | - Cheng-Hao Jin
- Drug Targeting Laboratory, College of Pharmacy, SungKyunKwan University, 300 Chonchon-dong, Jangan-ku, Suwon City 440–746, Korea, College of Pharmacy, Pusan National University, Busan 609–735, Korea, and Biomedical Research Center, Korea Institute of Science and Technology, Seoul 136–791, Korea
| | - Han Jong Shin
- Drug Targeting Laboratory, College of Pharmacy, SungKyunKwan University, 300 Chonchon-dong, Jangan-ku, Suwon City 440–746, Korea, College of Pharmacy, Pusan National University, Busan 609–735, Korea, and Biomedical Research Center, Korea Institute of Science and Technology, Seoul 136–791, Korea
| | - Yu Seok Youn
- Drug Targeting Laboratory, College of Pharmacy, SungKyunKwan University, 300 Chonchon-dong, Jangan-ku, Suwon City 440–746, Korea, College of Pharmacy, Pusan National University, Busan 609–735, Korea, and Biomedical Research Center, Korea Institute of Science and Technology, Seoul 136–791, Korea
| | - Seulki Lee
- Drug Targeting Laboratory, College of Pharmacy, SungKyunKwan University, 300 Chonchon-dong, Jangan-ku, Suwon City 440–746, Korea, College of Pharmacy, Pusan National University, Busan 609–735, Korea, and Biomedical Research Center, Korea Institute of Science and Technology, Seoul 136–791, Korea
| | - Kang Choon Lee
- Drug Targeting Laboratory, College of Pharmacy, SungKyunKwan University, 300 Chonchon-dong, Jangan-ku, Suwon City 440–746, Korea, College of Pharmacy, Pusan National University, Busan 609–735, Korea, and Biomedical Research Center, Korea Institute of Science and Technology, Seoul 136–791, Korea
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Youn YS, Chae SY, Lee S, Jeon JE, Shin HG, Lee KC. Evaluation of therapeutic potentials of site-specific PEGylated glucagon-like peptide-1 isomers as a type 2 anti-diabetic treatment: Insulinotropic activity, glucose-stabilizing capability, and proteolytic stability. Biochem Pharmacol 2006; 73:84-93. [PMID: 17054919 DOI: 10.1016/j.bcp.2006.09.013] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2006] [Revised: 09/06/2006] [Accepted: 09/08/2006] [Indexed: 11/26/2022]
Abstract
PEGylation has been considered to be a good biotechnique for improving the therapeutic value of glucagon-like peptide-1 (GLP-1) analogs for the treatment of type 2 diabetes. Despite the attractive anti-diabetic potentials, GLP-1 does not exert its full biological action because of its extremely short life-time in vivo due to rapid proteolytic degradation. Here, the enzyme-resistant mono-PEGylated GLP-1 isomers substituted at Lys(26)- or Lys(34)-amine were prepared through a newly devised site-specific PEGylation process using a maleic anhydride-protection/deprotection method. The therapeutic potentials of these site-specific PEGylated GLP-1 isomers (Lys(26)- or Lys(34)-PEG-GLP-1) along with His(7)-(N-terminus) PEG-GLP-1 were evaluated by examining their insulinotropic activity, glucose-stabilizing capability, and proteolytic stability. Lys(34)-PEG-GLP-1 was found to have the well-preserved insulinotropic activity (93% efficacy versus GLP-1) in isolated rat pancreatic islets. Furthermore, Lys(34)-PEG-GLP-1 showed the most prominent glucose-stabilizing capability, evaluated via an oral glucose tolerance test in db/db mice by considering the following three crucial factors: (i) maximum blood glucose level (BGL), (ii) required time to lower the BGL below 100mg/dl, and (iii) total hypoglycemic degree. Additionally, Lys(34)-PEG-GLP-1 had longer half-lives than the other PEGylated GLP-1s in the dipeptidyl peptidase IV (DPP IV) inhibitor-treated liver or kidney homogenate, and its stability against DPP IV was also comparable to that of Lys(26)-PEG-GLP-1. Taken together, Lys(34)-PEG-GLP-1 displayed the promising characteristics in all evaluations versus His(7)- or Lys(26)-PEG-GLP-1. This site-specific PEGylated GLP-1 analog would have therapeutic usefulness for treating type 2 diabetes on account of the well-preserved insulinotropic activity, the increased proteolytic stability, and thereby the improved glucose-stabilizing capability.
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Affiliation(s)
- Yu Seok Youn
- Drug Targeting Laboratory, College of Pharmacy, SungKyunKwan University, 300 Chonchon-dong, Jangan-ku, Suwon City 440-746, Republic of Korea
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Narang AS, Mahato RI. Biological and Biomaterial Approaches for Improved Islet Transplantation. Pharmacol Rev 2006; 58:194-243. [PMID: 16714486 DOI: 10.1124/pr.58.2.6] [Citation(s) in RCA: 137] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Islet transplantation may be used to treat type I diabetes. Despite tremendous progress in islet isolation, culture, and preservation, the clinical use of this modality of treatment is limited due to post-transplantation challenges to the islets such as the failure to revascularize and immune destruction of the islet graft. In addition, the need for lifelong strong immunosuppressing agents restricts the use of this option to a limited subset of patients, which is further restricted by the unmet need for large numbers of islets. Inadequate islet supply issues are being addressed by regeneration therapy and xenotransplantation. Various strategies are being tried to prevent beta-cell death, including immunoisolation using semipermeable biocompatible polymeric capsules and induction of immune tolerance. Genetic modification of islets promises to complement all these strategies toward the success of islet transplantation. Furthermore, synergistic application of more than one strategy is required for improving the success of islet transplantation. This review will critically address various insights developed in each individual strategy and for multipronged approaches, which will be helpful in achieving better outcomes.
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Affiliation(s)
- Ajit S Narang
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, 26 S. Dunlap St., Feurt Building, Room 413, Memphis, TN 38163, USA
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