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Rapp PB, Baccile JA, Galimidi RP, Vielmetter J. Engineering Antigen-Specific Tolerance to an Artificial Protein Hydrogel. ACS Biomater Sci Eng 2024; 10:2188-2199. [PMID: 38479351 DOI: 10.1021/acsbiomaterials.3c01430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Artificial protein hydrogels are an emerging class of biomaterials with numerous prospective applications in tissue engineering and regenerative medicine. These materials are likely to be immunogenic due to their frequent incorporation of novel amino acid sequence domains, which often serve a functional role within the material itself. We engineered injectable "self" and "nonself" artificial protein hydrogels, which were predicted to have divergent immune outcomes in vivo on the basis of their primary amino acid sequence. Following implantation in mouse, the nonself gels raised significantly higher antigel antibody titers than the corresponding self gels. Prophylactic administration of a fusion antibody targeting the nonself hydrogel epitopes to DEC-205, an endocytic receptor involved in Treg induction, fully suppressed the elevated antibody titer against the nonself gels. These results suggest that the clinical immune response to artificial protein biomaterials, including those that contain highly antigenic sequence domains, can be tuned through the induction of antigen-specific tolerance.
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Affiliation(s)
- Peter B Rapp
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd, Pasadena, California 91125, United States
| | - Joshua A Baccile
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd, Pasadena, California 91125, United States
| | - Rachel P Galimidi
- Division of Biology and Biological Engineering, California Institute of Technology, 1200 E. California Blvd, Pasadena, California 91125, United States
| | - Jost Vielmetter
- Division of Biology and Biological Engineering, California Institute of Technology, 1200 E. California Blvd, Pasadena, California 91125, United States
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Bennett JI, Boit MO, Gregorio NE, Zhang F, Kibler RD, Hoye JW, Prado O, Rapp PB, Murry CE, Stevens KR, DeForest CA. Genetically Encoded XTEN-based Hydrogels with Tunable Viscoelasticity and Biodegradability for Injectable Cell Therapies. Adv Sci (Weinh) 2024:e2301708. [PMID: 38477407 DOI: 10.1002/advs.202301708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 01/08/2024] [Indexed: 03/14/2024]
Abstract
While direct cell transplantation holds great promise in treating many debilitating diseases, poor cell survival and engraftment following injection have limited effective clinical translation. Though injectable biomaterials offer protection against membrane-damaging extensional flow and supply a supportive 3D environment in vivo that ultimately improves cell retention and therapeutic costs, most are created from synthetic or naturally harvested polymers that are immunogenic and/or chemically ill-defined. This work presents a shear-thinning and self-healing telechelic recombinant protein-based hydrogel designed around XTEN - a well-expressible, non-immunogenic, and intrinsically disordered polypeptide previously evolved as a genetically encoded alternative to PEGylation to "eXTENd" the in vivo half-life of fused protein therapeutics. By flanking XTEN with self-associating coil domains derived from cartilage oligomeric matrix protein, single-component physically crosslinked hydrogels exhibiting rapid shear thinning and self-healing through homopentameric coiled-coil bundling are formed. Individual and combined point mutations that variably stabilize coil association enables a straightforward method to genetically program material viscoelasticity and biodegradability. Finally, these materials protect and sustain viability of encapsulated human fibroblasts, hepatocytes, embryonic kidney (HEK), and embryonic stem-cell-derived cardiomyocytes (hESC-CMs) through culture, injection, and transcutaneous implantation in mice. These injectable XTEN-based hydrogels show promise for both in vitro cell culture and in vivo cell transplantation applications.
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Affiliation(s)
- Jennifer I Bennett
- Department of Chemical Engineering, University of Washington, Seattle, WA, 98105, USA
| | - Mary O'Kelly Boit
- Department of Chemical Engineering, University of Washington, Seattle, WA, 98105, USA
| | - Nicole E Gregorio
- Department of Bioengineering, University of Washington, Seattle, WA, 98105, USA
| | - Fan Zhang
- Department of Bioengineering, University of Washington, Seattle, WA, 98105, USA
| | - Ryan D Kibler
- Department of Biochemistry, University of Washington, Seattle, WA, 98105, USA
- Institute for Protein Design, University of Washington, Seattle, WA, 98105, USA
| | - Jack W Hoye
- Department of Chemical Engineering, University of Washington, Seattle, WA, 98105, USA
| | - Olivia Prado
- Department of Bioengineering, University of Washington, Seattle, WA, 98105, USA
| | - Peter B Rapp
- Flagship Labs 83, Inc., 135 Morrissey Blvd., Boston, MA, 02125, USA
| | - Charles E Murry
- Department of Bioengineering, University of Washington, Seattle, WA, 98105, USA
- Institute of Stem Cell & Regenerative Medicine, University of Washington, Seattle, WA, 98109, USA
- Department of Laboratory Medicine & Pathology, University of Washington, Seattle, WA, 98195, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, 98109, USA
| | - Kelly R Stevens
- Department of Bioengineering, University of Washington, Seattle, WA, 98105, USA
- Institute of Stem Cell & Regenerative Medicine, University of Washington, Seattle, WA, 98109, USA
- Department of Laboratory Medicine & Pathology, University of Washington, Seattle, WA, 98195, USA
| | - Cole A DeForest
- Department of Chemical Engineering, University of Washington, Seattle, WA, 98105, USA
- Department of Bioengineering, University of Washington, Seattle, WA, 98105, USA
- Institute for Protein Design, University of Washington, Seattle, WA, 98105, USA
- Institute of Stem Cell & Regenerative Medicine, University of Washington, Seattle, WA, 98109, USA
- Department of Chemistry, University of Washington, Seattle, WA, 98105, USA
- Molecular Engineering & Sciences Institute, University of Washington, Seattle, WA, 98105, USA
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Abstract
We report a new catalytic method for alcohol sulfamoylation that deploys electron-deficient aryl sulfamates as activated group transfer reagents. The reaction utilizes the simple organic base N-methylimidazole, proceeds under mild conditions, and provides intrinsic selectivity for 1° over 2° alcohols (up to >40:1 for certain nucleosides). The requisite aryl sulfamate donors are stable crystalline solids that can be readily prepared on a large scale. Mechanistic considerations support the intermediacy of HNSO2 "aza-sulfene" in the transfer reaction.
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Affiliation(s)
- Peter B Rapp
- Department of Chemistry , Yale University , P.O. Box 208107, New Haven , Connecticut 06520-8107 , United States
| | - Koichi Murai
- Process Chemistry Development , Takeda Pharmaceuticals International Co. , Cambridge , Massachusetts 02139 , United States
| | - Naoko Ichiishi
- Process Chemistry Development , Takeda Pharmaceuticals International Co. , Cambridge , Massachusetts 02139 , United States
| | - David K Leahy
- Process Chemistry Development , Takeda Pharmaceuticals International Co. , Cambridge , Massachusetts 02139 , United States
| | - Scott J Miller
- Department of Chemistry , Yale University , P.O. Box 208107, New Haven , Connecticut 06520-8107 , United States
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Rapp PB, Omar AK, Silverman BR, Wang ZG, Tirrell DA. Mechanisms of Diffusion in Associative Polymer Networks: Evidence for Chain Hopping. J Am Chem Soc 2018; 140:14185-14194. [PMID: 30272969 DOI: 10.1021/jacs.8b07908] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Networks assembled by reversible association of telechelic polymers constitute a common class of soft materials. Various mechanisms of chain migration in associative networks have been proposed; yet there remains little quantitative experimental data to discriminate among them. Proposed mechanisms for chain migration include multichain aggregate diffusion as well as single-chain mechanisms such as "walking" and "hopping", wherein diffusion is achieved by either partial ("walking") or complete ("hopping") disengagement of the associated chain segments. Here, we provide evidence that hopping can dominate the effective diffusion of chains in associative networks due to a strong entropic penalty for bridge formation imposed by local network structure; chains become conformationally restricted upon association with two or more spatially separated binding sites. This restriction decreases the effective binding strength of chains with multiple associative domains, thereby increasing the probability that a chain will hop. For telechelic chains this manifests as binding asymmetry, wherein the first association is effectively stronger than the second. We derive a simple thermodynamic model that predicts the fraction of chains that are free to hop as a function of tunable molecular and network properties. A large set of self-diffusivity measurements on a series of model associative polymers finds good agreement with this model.
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Affiliation(s)
- Peter B Rapp
- Division of Chemistry and Chemical Engineering , California Institute of Technology , 1200 East California Boulevard, MC 210-41 , Pasadena , California 91125 , United States
| | - Ahmad K Omar
- Division of Chemistry and Chemical Engineering , California Institute of Technology , 1200 East California Boulevard, MC 210-41 , Pasadena , California 91125 , United States
| | - Bradley R Silverman
- Division of Chemistry and Chemical Engineering , California Institute of Technology , 1200 East California Boulevard, MC 210-41 , Pasadena , California 91125 , United States
| | - Zhen-Gang Wang
- Division of Chemistry and Chemical Engineering , California Institute of Technology , 1200 East California Boulevard, MC 210-41 , Pasadena , California 91125 , United States
| | - David A Tirrell
- Division of Chemistry and Chemical Engineering , California Institute of Technology , 1200 East California Boulevard, MC 210-41 , Pasadena , California 91125 , United States
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Affiliation(s)
- Peter B. Rapp
- Division of Chemistry
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Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 210-41, Pasadena, California 91125, United States
| | - Ahmad K. Omar
- Division of Chemistry
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Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 210-41, Pasadena, California 91125, United States
| | - Jeff J. Shen
- Division of Chemistry
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Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 210-41, Pasadena, California 91125, United States
| | - Maren E. Buck
- Division of Chemistry
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Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 210-41, Pasadena, California 91125, United States
| | - Zhen-Gang Wang
- Division of Chemistry
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Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 210-41, Pasadena, California 91125, United States
| | - David A. Tirrell
- Division of Chemistry
and
Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 210-41, Pasadena, California 91125, United States
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