The proposed study will test the hypothesis that a hydrogel sealant can replace conventional sutures in the repair of corneal and scleral tissue. Recently, the investigators have prepared hydrogel sealants from well-defined monodisperse polymers, which are composed of biocompatible monomers called biodendrimers. Biodendrimers have several features that make them uniquely attractive for this sealant application: (1) the chemical composition, physical structure, and molecular weight can be precisely controlled; (2) the dendrimer structure permits diverse and extensive functionalization that facilitates covalent intermolecular crosslinking to form a hydrogel; (3) aqueous solutions of biodendrimer can be crosslinked in situ to form a functional and well-integrated hydrogel scaffold using a mild crosslinking reaction; and (4) the mechanical properties of crosslinked biodendrimer hydrogels can be tuned over a wide range of values by varying the functional groups, molecular weight, dendrimer structure, and concentration. ? ? Specifically, the researchers propose to engineer biodendrimer hydrogel sealants for functional in vivo repair of ocular tissue. We plan to quantify various measures of sealant functions both in vitro and in vivo as a set of outcomes for each formulation, including parameters of mechanical and biological behaviors, biochemical composition, and histological appearance.
The specific aims of this study are: (1) synthesize, crosslink, and characterize self-gelling biodendrimer sealants; (2) evaluate functional characteristics of biodendrimer sealants in vitro and in vivo for repairing 4.1 mm central corneal lacerations; (3) evaluate functional characteristics of biodendrimer sealants in vitro and in vivo for securing a corneal autograft; and (4) evaluate functional characteristics of biodendrimer sealants in vitro and in vivo for repairing scleral incisions in a vitrectomy procedure. ? ? The results from the successful completion of these proposed studies will yield a database of properties, structure-property relationships, insights to guide the design of an optimized biodendrimer-based sealant, and potentially, a general sealant for ocular tissue repair. ? ? Relevance to Public Health. The proposed study will lead to new ophthalmic surgical techniques, procedures, and/or treatments for repairing ocular wounds using unique and custom-designed biodendrimerbased hydrogel sealants. ? ?

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY013881-07
Application #
7291617
Study Section
Bioengineering, Technology and Surgical Sciences Study Section (BTSS)
Program Officer
Shen, Grace L
Project Start
2002-02-01
Project End
2009-08-31
Budget Start
2007-09-01
Budget End
2008-08-31
Support Year
7
Fiscal Year
2007
Total Cost
$194,201
Indirect Cost
Name
Boston University
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
049435266
City
Boston
State
MA
Country
United States
Zip Code
02215
Ghobril, Cynthia; Rodriguez, Edward K; Nazarian, Ara et al. (2016) Recent Advances in Dendritic Macromonomers for Hydrogel Formation and Their Medical Applications. Biomacromolecules 17:1235-52
Ghobril, C; Grinstaff, M W (2015) The chemistry and engineering of polymeric hydrogel adhesives for wound closure: a tutorial. Chem Soc Rev 44:1820-35
Wen, Yifen; Oh, Jung Kwon (2014) Recent strategies to develop polysaccharide-based nanomaterials for biomedical applications. Macromol Rapid Commun 35:1819-32
Zhang, Heng; Grinstaff, Mark W (2014) Recent advances in glycerol polymers: chemistry and biomedical applications. Macromol Rapid Commun 35:1906-24
Oelker, Abigail M; Berlin, Jason A; Wathier, Michel et al. (2011) Synthesis and characterization of dendron cross-linked PEG hydrogels as corneal adhesives. Biomacromolecules 12:1658-65
Johnson, C Starck; Wathier, Michel; Grinstaff, Mark et al. (2009) In vitro sealing of clear corneal cataract incisions with a novel biodendrimer adhesive. Arch Ophthalmol 127:430-4
Berdahl, John P; Johnson, C Stark; Proia, Alan D et al. (2009) Comparison of sutures and dendritic polymer adhesives for corneal laceration repair in an in vivo chicken model. Arch Ophthalmol 127:442-7
Degoricija, Lovorka; Bansal, Prashant N; Sontjens, Serge H M et al. (2008) Hydrogels for osteochondral repair based on photocrosslinkable carbamate dendrimers. Biomacromolecules 9:2863-72
Degoricija, Lovorka; Johnson, C Starck; Wathier, Michel et al. (2007) Photo cross-linkable Biodendrimers as ophthalmic adhesives for central lacerations and penetrating keratoplasties. Invest Ophthalmol Vis Sci 48:2037-42
Kang, Paul C; Carnahan, Michael A; Wathier, Michel et al. (2005) Novel tissue adhesives to secure laser in situ keratomileusis flaps. J Cataract Refract Surg 31:1208-12

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