This proposal develops a nanostructured mimic of extracellular matrix prepared from a self-assembling peptide we call Multidomain Peptides or MDPs. The MDPs self-assemble into nanofibers that can be triggered to form a hydrogel. Because the peptides are easy to prepare and have a well defined design criteria many variations on the MDP architecture can be prepared which allow us to tailor 1) the conditions under which the fibers self-assemble (including conditions compatible with cell culture and in vivo applications), 2) the mechanical properties critical for handling and injectability, 3) the presentation of chemical information for cells, and 4) controlled biodegradation. This exceptional combination of properties will be developed here to create biomimetic scaffolds for the entrapment and delivery of cells, proteins and small molecule drugs. Our work will culminate with an in vivo application which uses this nanostructured hydrogel for dental regeneration. It is expected that the nanofibers will prove to be suitable as an injectable, localized, simultaneous delivery method for cells, proteins and small molecule drugs which will actively assist in directing cellular activity. Finally, after the MDP matrix has played its role it will degrade leaving behind only regenerated tissue. Such a matrix will play a critical role in future tissue engineering strategies (including, but not limited to, dental regeneration) which require a smart scaffolding material to organize the constituent cells and drugs until the body's own regenerative ability can take over. Our proposal is organized into four aims.
Aim 1 will determine the design, flexibility and methods used to prepare MDP nanofibers.
Aim 2 will optimize MDP nanofibers for three dimensional cell entrapment, cell delivery and cell mediated biodegradation.
Aim 3 will develop a series of nanofibrous gels which will deliver growth factors and other small molecules localized in time and space.
Aim 4 will test the above developed nanofibrous hydrogels ability to promote dental regeneration in vivo. This highly translational research will apply novel tissue engineering and nanotechnology concepts to the design of multidomain peptide hydrogels intended as an all-purpose scaffold for the regeneration tissue (tested here on the regeneration of the dentin-pulp complex). By combining expertise in chemistry, materials sciences, nanotechnology, cell biology and clinical dentistry we will generate data that will provide the framework for further studies testing these hydrogels in human clinical trials.

Public Health Relevance

One of the most exciting areas of medical research is tissue engineering which promises to supplement our own regenerative ability to allow us to replace or re-grow damaged or diseased tissues and organs. Researchers use appropriate cell lines, growth factors and drugs which are organized by a synthetic matrix. In this proposal we describe an interdisciplinary approach to the design and optimization of a nanostructured matrix made from synthetic proteins. This matrix will entrap cells, proteins and drugs and allow them to be delivered together by syringe to the site necessary.

National Institute of Health (NIH)
National Institute of Dental & Craniofacial Research (NIDCR)
Research Project (R01)
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Nanotechnology Study Section (NANO)
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Lumelsky, Nadya L
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Rice University
Schools of Arts and Sciences
United States
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Li, I-Che; Hartgerink, Jeffrey D (2017) Covalent Capture of Aligned Self-Assembling Nanofibers. J Am Chem Soc 139:8044-8050
Kumar, Vivek A; Liu, Qi; Wickremasinghe, Navindee C et al. (2016) Treatment of hind limb ischemia using angiogenic peptide nanofibers. Biomaterials 98:113-9
Kumar, Vivek A; Shi, Siyu; Wang, Benjamin K et al. (2015) Drug-triggered and cross-linked self-assembling nanofibrous hydrogels. J Am Chem Soc 137:4823-30
Kumar, Vivek A; Taylor, Nichole L; Shi, Siyu et al. (2015) Self-assembling multidomain peptides tailor biological responses through biphasic release. Biomaterials 52:71-8
Wickremasinghe, Navindee C; Kumar, Vivek A; Shi, Siyu et al. (2015) Controlled Angiogenesis in Peptide Nanofiber Composite Hydrogels. ACS Biomater Sci Eng 1:845-854
Moore, A N; Perez, S C; Hartgerink, J D et al. (2015) Ex Vivo Modeling of Multidomain Peptide Hydrogels with Intact Dental Pulp. J Dent Res 94:1773-81
Kumar, Vivek A; Wickremasinghe, Navindee C; Shi, Siyu et al. (2015) Nanofibrous Snake Venom Hemostat. ACS Biomater Sci Eng 1:1300-1305
Kumar, Vivek A; Taylor, Nichole L; Shi, Siyu et al. (2015) Highly angiogenic peptide nanofibers. ACS Nano 9:860-8
Kumar, Vivek A; Taylor, Nichole L; Jalan, Abhishek A et al. (2014) A nanostructured synthetic collagen mimic for hemostasis. Biomacromolecules 15:1484-90
Wickremasinghe, Navindee C; Kumar, Vivek A; Hartgerink, Jeffrey D (2014) Two-step self-assembly of liposome-multidomain peptide nanofiber hydrogel for time-controlled release. Biomacromolecules 15:3587-95

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