201
|
Aimé C, Mosser G, Pembouong G, Bouteiller L, Coradin T. Controlling the nano-bio interface to build collagen-silica self-assembled networks. NANOSCALE 2012; 4:7127-7134. [PMID: 23070474 DOI: 10.1039/c2nr31901b] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Bio-hybrid networks are designed based on the self-assembly of surface-engineered collagen-silica nanoparticles. Collagen triple helices can be confined on the surface of sulfonate-modified silica particles in a controlled manner. This gives rise to hybrid building blocks with well-defined diameters and surface potentials. Taking advantage of the self-assembling properties of collagen, collagen-silica networks are further built-up in solution. The structural and specific recognition properties of the collagen fibrils are well-preserved within the hybrid assembly. A combination of calorimetry, dynamic light scattering, zetametry and microscopy studies indicates that network formation occurs via a surface-mediated mechanism where pre-organization of the protein chains on the particle surface favors the fibrillogenesis process. These results enlighten the importance of the nano-bio interface on the formation and properties of self-assembled bionanocomposites.
Collapse
Affiliation(s)
- Carole Aimé
- UPMC Univ Paris 06, CNRS, Chimie de la Matière Condensée de Paris Collège de France, 11 place Marcelin Berthelot, F-75005 Paris, France.
| | | | | | | | | |
Collapse
|
202
|
Roberts D, Rochas C, Saiani A, Miller AF. Effect of peptide and guest charge on the structural, mechanical and release properties of β-sheet forming peptides. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:16196-206. [PMID: 23088490 DOI: 10.1021/la303328p] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The effect of peptide charge on the self-assembly, gelation behavior, and model drug release profiles has been explored here for three octa-peptides, VEVKVEVK (VEK2), VKVKVEVK (VEK3), and VEVEVKVE (VEK1), that carry a net charge of 0, +2, and -2 at neutral pH, respectively. Transparent, self-supporting hydrogels were found to form above a critical concentration when the peptide charge modulus was >1 and this was independent of the sign of the charge. TEM, SAXS, and shear rheology revealed that there were no differences in hydrogel structure or mechanical properties when the peptides were at the same concentration and carried the same charge modulus. All peptides were found to form dense fibrillar networks formed by β-sheet rich single fibers where lateral aggregation of the fibers occurred and increased with decreasing charge modulus. Such behavior was found to correlate with an increase in hydrogel mechanical properties, demonstrating that fiber lateral aggregation is inextricably linked with the mechanical properties of these hydrogels. Two hydrophilic model drug molecules, namely napthol yellow (NY) and martius yellow (MY), were subsequently incorporated within the VEK1 and VEK3 hydrogels at pH 7 and although they did not effect the self-assembly of the peptide at a molecular level, they did effect the level of lateral fiber aggregation observed and, therefore, the mechanical properties of the hydrogels. The release of each molecule from the hydrogels was monitored over time and shown to be controlled by Fickian diffusion where the diffusion rate, D, was dependent on the ratio between the overall effective charges carried by the peptide, i.e., the fibrillar network, and the overall charges carried by the guest molecules, but independent from the hydrogel concentration and mechanical properties within the ranges investigated. This work highlights the possibility of controlling the rate of release of small drug molecules by manipulating the charges on the guest molecules as well as the charged state of the self-assembling peptide.
Collapse
Affiliation(s)
- D Roberts
- School of Chemical Engineering and Analytical Science & Manchester Institute of Biotechnology, The University of Manchester, Manchester, United Kingdom
| | | | | | | |
Collapse
|
203
|
Mendes AC, Baran ET, Lisboa P, Reis RL, Azevedo HS. Microfluidic fabrication of self-assembled peptide-polysaccharide microcapsules as 3D environments for cell culture. Biomacromolecules 2012; 13:4039-48. [PMID: 23083474 DOI: 10.1021/bm301332z] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We report a mild cell encapsulation method based on self-assembly and microfluidics technology. Xanthan gum, an anionic polysaccharide, was used to trigger the self-assembly of a positively charged multidomain peptide. The self-assembly resulted in the formation of a nanofibrous matrix and using a microfluidic device, microcapsules with homogeneous size were fabricated. The properties and performance of xanthan-peptide microcapsules were optimized by changing peptide/polysaccharide ratio and their effects on the microcapsule permeability and mechanical stability were analyzed. The effect of microcapsule formulation on viability and proliferation of encapsulated chondrocytic (ATDC5) cells was also investigated. The encapsulated cells were metabolically active, showing an increased viability and proliferation over 21 days of in vitro culture, demonstrating the long-term stability of the self-assembled microcapsules and their ability to support and enhance the survival of encapsulated cells over a prolonged time. Self-assembling materials combined with microfluidics demonstrated to be an innovative approach in the fabrication of cytocompatible matrix for cell microencapsulation and delivery.
Collapse
Affiliation(s)
- Ana C Mendes
- 3B's Research Group, Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal
| | | | | | | | | |
Collapse
|
204
|
A Systematic Study on the Self-Assembly Behaviour of Multi Component Fmoc-Amino Acid-Poly(oxazoline) Systems. Polymers (Basel) 2012. [DOI: 10.3390/polym4031399] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
205
|
Shirazi RS, Ewert KK, Silva BFB, Leal C, Li Y, Safinya CR. Structural evolution of environmentally responsive cationic liposome-DNA complexes with a reducible lipid linker. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:10495-503. [PMID: 22616637 PMCID: PMC3399028 DOI: 10.1021/la301181b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Environmentally responsive materials (i.e., materials that respond to changes in their environment with a change in their properties or structure) are attracting increasing amounts of interest. We recently designed and synthesized a series of cleavable multivalent lipids (CMVLn, with n = 2-5 being the number of positive headgroup charges at full protonation) with a disulfide bond in the linker between their cationic headgroup and hydrophobic tails. The self-assembled complexes of the CMVLs and DNA are a prototypical environmentally responsive material, undergoing extensive structural rearrangement when exposed to reducing agents. We investigated the structural evolution of CMVL-DNA complexes at varied complex composition, temperature, and incubation time using small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS). A related lipid with a stable linker, TMVL4, was used as a control. In a nonreducing environment, CMVL-DNA complexes form the lamellar (L(α)(C)) phase, with DNA rods sandwiched between lipid bilayers. However, new self-assembled phases form when the disulfide linker is cleaved by dithiothreitol or the biologically relevant reducing agent glutathione. The released DNA and cleaved CMVL headgroups form a loosely organized phase, giving rise to a characteristic broad SAXS correlation profile. CMVLs with high headgroup charge also form condensed DNA bundles. Intriguingly, the cleaved hydrophobic tails of the CMVLs reassemble into tilted chain-ordered L(β') phases upon incubation at physiological temperature (37 °C), as indicated by characteristic WAXS peaks. X-ray scattering further reveals that two of the three phases (L(βF), L(βL), and L(βI)) constituting the L(β') phase coexist in these samples. The described system may have applications in lipid-based nanotechnologies.
Collapse
Affiliation(s)
- Rahau S. Shirazi
- Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106, United States
| | - Kai K. Ewert
- Department of Materials, Department of Physics, and Molecular, Cellular & Developmental Biology Department, University of California at Santa Barbara, Santa Barbara, California 93106, United States
| | - Bruno F. B. Silva
- Department of Materials, Department of Physics, and Molecular, Cellular & Developmental Biology Department, University of California at Santa Barbara, Santa Barbara, California 93106, United States
- Division of Physical Chemistry, Centre for Chemistry and Chemical Engineering, Lund University, SE-221 00 Lund, Sweden
| | - Cecilia Leal
- Department of Materials, Department of Physics, and Molecular, Cellular & Developmental Biology Department, University of California at Santa Barbara, Santa Barbara, California 93106, United States
| | - Youli Li
- Materials Research Laboratory, University of California, Santa Barbara, California 93106, United States
| | - Cyrus R. Safinya
- Department of Materials, Department of Physics, and Molecular, Cellular & Developmental Biology Department, University of California at Santa Barbara, Santa Barbara, California 93106, United States
| |
Collapse
|
206
|
Wu Y, Pramanik G, Eisele K, Weil T. Convenient Approach to Polypeptide Copolymers Derived from Native Proteins. Biomacromolecules 2012; 13:1890-8. [DOI: 10.1021/bm300418r] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Yuzhou Wu
- Institute for Organic
Chemistry
III/Macromolecular Chemistry, Ulm University, Albert-Einstein-Allee 11, 89073 Ulm, Germany
| | - Goutam Pramanik
- Institute for Organic
Chemistry
III/Macromolecular Chemistry, Ulm University, Albert-Einstein-Allee 11, 89073 Ulm, Germany
| | - Klaus Eisele
- Institute for Organic
Chemistry
III/Macromolecular Chemistry, Ulm University, Albert-Einstein-Allee 11, 89073 Ulm, Germany
| | - Tanja Weil
- Institute for Organic
Chemistry
III/Macromolecular Chemistry, Ulm University, Albert-Einstein-Allee 11, 89073 Ulm, Germany
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
| |
Collapse
|
207
|
Randolph LM, Chien MP, Gianneschi NC. Biological stimuli and biomolecules in the assembly and manipulation of nanoscale polymeric particles. Chem Sci 2012; 3:10.1039/C2SC00857B. [PMID: 24353895 PMCID: PMC3864871 DOI: 10.1039/c2sc00857b] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Living systems are replete with complex, stimuli-responsive nanoscale materials and molecular self-assemblies. There is an ever increasing and intense interest within the chemical sciences to understand, mimic and interface with these biological systems utilizing synthetic and/or semi-synthetic tools. Our aim in this review is to give perspective on this emerging field of research by highlighting examples of polymeric nanoparticles and micelles that are prepared utilizing biopolymers together with synthetic polymers for the purpose of developing nanomaterials capable of interacting and responding to biologically relevant stimuli. It is expected that with the merging of evolved biological molecules with synthetic materials, will come the ability to prepare complex, functional devices. A variety of applications will become accessible including self-healing materials, self-replicating systems, biodiagnostic tools, drug targeting materials and autonomous, adaptive sensors. Most importantly, the success of this type of strategy will impact how biomolecules are stabilized and incorporated into synthetic devices and at the same time, will influence how synthetic materials are utilized within biomedical applications.
Collapse
Affiliation(s)
| | | | - Nathan C. Gianneschi
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA, 92093, USA
| |
Collapse
|
208
|
Jeong SY, Moon HJ, Park MH, Joo MK, Jeong B. Molecular captain: A light-sensitive linker molecule in poly(ethylene glycol)-poly(L-alanine)-poly(ethylene glycol) triblock copolymer directs molecular nano-assembly, conformation, and sol-gel transition. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26104] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
209
|
Ding HM, Tian WD, Ma YQ. Designing nanoparticle translocation through membranes by computer simulations. ACS NANO 2012; 6:1230-8. [PMID: 22208867 DOI: 10.1021/nn2038862] [Citation(s) in RCA: 214] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Nanoparticle penetration into cells is an important process in drug/gene delivery. Here, we successfully design one type of novel nanoparticles with ligands decorating its surface by dynamic bonds and find that the nanoparticle can spontaneously penetrate through membranes by using dissipative particle dynamics simulations. Moreover, the physical parameters of both ligands (for example, ligand type and density) and nanoparticles (such as size and shape) have significant effects on penetration efficiency and translocation time. Especially for nanoparticles with anisotropic shapes or asymmetric surface decoration, the penetration efficiency may reach about 80%. We also provide insights into the interaction between nanoparticles and asymmetric membranes and find that the membrane asymmetry can even increase the penetration efficiency to above 90%. The present study suggests a potential way to translocate novel nanoparticles through membranes, which may provide new ideas for future experimental nanoparticle design and drug delivery.
Collapse
Affiliation(s)
- Hong-Ming Ding
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
| | | | | |
Collapse
|
210
|
Affiliation(s)
- Tina Vermonden
- Department of Pharmaceutics, Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands.
| | | | | |
Collapse
|
211
|
Qin SY, Xu SS, Zhuo RX, Zhang XZ. Morphology transformation via pH-triggered self-assembly of peptides. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2083-2090. [PMID: 22142196 DOI: 10.1021/la203518w] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Three flexible peptides (P1: (C(17)H(35)CO-NH-GRGDG)(2)KG; P2: (Fmoc-GRGDG)(2)KG; P3: (CH(3)CO-NH-GRGDG)(2)KG) self-assembled to form a variety of morphologically distinct assemblies at different pHs. P1 formed nanofibers at pH 3, then self-assembled into nanospheres with pH up to 6 and further changed to lamellar structures when the pH value was further increased to 10. P2 aggregated into an entwined network structure at pH 3, and then self-assembled into well-defined nanospheres, lamellar structures, and vesicles via adjusting the pH value. However, P3 did not self-assemble into well-ordered nanostructures, presumably due to the absence of a large hydrophobic group. The varying self-assembly behaviors of the peptides at different pHs are attributed to molecular conformational changes. These self-assembled supramolecular materials might contribute to the development of new peptide-based biomaterials.
Collapse
Affiliation(s)
- Si-Yong Qin
- Key Laboratory of Biomedical Polymers of Ministry of Education and Department of Chemistry, Wuhan University, Wuhan 430072, China
| | | | | | | |
Collapse
|
212
|
Tangbunsuk S, Whittell GR, Ryadnov MG, Vandermeulen GWM, Woolfson DN, Manners I. Metallopolymer-Peptide Hybrid Materials: Synthesis and Self-Assembly of Functional, Polyferrocenylsilane-Tetrapeptide Conjugates. Chemistry 2012; 18:2524-35. [DOI: 10.1002/chem.201102223] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Indexed: 01/23/2023]
|
213
|
Ariga K, Mori T, Hill JP. Mechanical control of nanomaterials and nanosystems. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:158-76. [PMID: 21953700 DOI: 10.1002/adma.201102617] [Citation(s) in RCA: 259] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Indexed: 05/23/2023]
Abstract
In situations of power outage or shortage, such as periods just following a seismic disaster, the only reliable power source available is the most fundamental of forces i.e., manual mechanical stimuli. Although there are many macroscopic mechanical tools, mechanical control of nanomaterials and nanosystems has not been an easy subject to develop even by using advanced nanotechnological concepts. However, this challenge has now become a hot topic and many new ideas and strategies have been proposed recently. This report summarizes recent research examples of mechanical control of nanomaterials and nanosystems. Creation of macroscopic mechanical outputs by efficient accumulation of molecular-level phenomena is first briefly introduced. We will then introduce the main subject: control of molecular systems by macroscopic mechanical stimuli. The research described is categorized according to the respective areas of mechanical control of molecular structure, molecular orientation, molecular interaction including cleavage and healing, and biological and micron-level phenomena. Finally, we will introduce two more advanced approaches, namely, mechanical strategies for microdevice fabrication and mechanical control of molecular machines. As mechanical forces are much more reliable and widely applicable than other stimuli, we believe that development of mechanically responsive nanomaterials and nanosystems will make a significant contribution to fundamental improvements in our lifestyles and help to maintain and stabilize our society.
Collapse
Affiliation(s)
- Katsuhiko Ariga
- World Premier International (WPI) Research, Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) Tsukuba, Japan.
| | | | | |
Collapse
|
214
|
Zelzer M, McNamara LE, Scurr DJ, Alexander MR, Dalby MJ, Ulijn RV. Phosphatase responsive peptide surfaces. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31666h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
215
|
Azuma Y, Imai H, Yoshimura T, Kawabata T, Imanishi M, Futaki S. Dipicolylamine as a unique structural switching element for helical peptides. Org Biomol Chem 2012; 10:6062-8. [DOI: 10.1039/c2ob07118e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
216
|
Shao H, Bewick NA, Parquette JR. Intramolecular chiral communication in peptide–dendron hybrids. Org Biomol Chem 2012; 10:2377-9. [DOI: 10.1039/c2ob07014f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
217
|
Responsive nematic gels from the self-assembly of aqueous nanofibres. Nat Commun 2011; 2:459. [PMID: 21897370 DOI: 10.1038/ncomms1465] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Accepted: 07/29/2011] [Indexed: 11/08/2022] Open
Abstract
Aqueous nanofibres constructed by the self-assembly of small amphiphilic molecules can become entangled to form hydrogels that have a variety of applications including tissue engineering, and controlled drug delivery. The hydrogels are formed through the random physical cross-linkings of flexible nanofibres. Here we report that self-assembled nanofibres with a nematic substructure are aligned into a nematic liquid crystal and are spontaneously fixed in the aligned state to give rise to anisotropic gels. The liquid-crystal gels respond to temperature by transforming into a fluid solution upon cooling. Thus, the nanofibre solution can be mixed with cells at room temperature and then can be transformed into gels to encapsulate the cells in a three-dimensional environment upon being heated to physiological temperatures. We found that the cells grow within the three-dimensional networks without compromising the cell viability, and that subsequent cooling triggers the encapsulated cells to be released through a sol-gel transition.
Collapse
|
218
|
Kushner AM, Guan Z. Modulares Design in natürlichen und biomimetischen elastischen Materialien. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006496] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
219
|
Kushner AM, Guan Z. Modular design in natural and biomimetic soft materials. Angew Chem Int Ed Engl 2011; 50:9026-57. [PMID: 21898722 DOI: 10.1002/anie.201006496] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2010] [Indexed: 11/09/2022]
Abstract
Under eons of evolutionary and environmental pressure, biological systems have developed strong and lightweight peptide-based polymeric materials by using the 20 naturally occurring amino acids as principal monomeric units. These materials outperform their man-made counterparts in the following ways: 1) multifunctionality/tunability, 2) adaptability/stimuli-responsiveness, 3) synthesis and processing under ambient and aqueous conditions, and 4) recyclability and biodegradability. The universal design strategy that affords these advanced properties involves "bottom-up" synthesis and modular, hierarchical organization both within and across multiple length-scales. The field of "biomimicry"-elucidating and co-opting nature's basic material design principles and molecular building blocks-is rapidly evolving. This Review describes what has been discovered about the structure and molecular mechanisms of natural polymeric materials, as well as the progress towards synthetic "mimics" of these remarkable systems.
Collapse
Affiliation(s)
- Aaron M Kushner
- Department of Chemistry, University of California, Irvine, CA 92697-2025, USA
| | | |
Collapse
|
220
|
Milanesi L, Hunter CA, Tzokova N, Waltho JP, Tomas S. Versatile low-molecular-weight hydrogelators: achieving multiresponsiveness through a modular design. Chemistry 2011; 17:9753-61. [PMID: 21793058 DOI: 10.1002/chem.201100640] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Indexed: 01/28/2023]
Abstract
Multiresponsive low-molecular-weight hydrogelators (LMWHs) are ideal candidates for the development of smart, soft, nanotechnology materials. The synthesis is however very challenging. On the one hand, de novo design is hampered by our limited ability to predict the assembly of small molecules in water. On the other hand, modification of pre-existing LMWHs is limited by the number of different stimuli-sensitive chemical moieties that can be introduced into a small molecule without seriously disrupting the ability to gelate water. Herein we report the synthesis and characterization of multistimuli LMWHs, based on a modular design, composed of a hydrophobic, disulfide, aromatic moiety, a maleimide linker, and a hydrophilic section based on an amino acid, here N-acetyl-L-cysteine (NAC). As most LMWHs, these gelators experience reversible gel-to-sol transition following temperature changes. Additionally, the NAC moiety allows reversible control of the assembly of the gel by pH changes. The reduction of the aromatic disulfide triggers a gel-to-sol transition that, depending on the design of the particular LMWH, can be reverted by reoxidation of the resulting thiol. Finally, the hydrolysis of the cyclic imide moieties provides an additional trigger for the gel-to-sol transition with a timescale that is appropriate for use in drug-delivery applications. The efficient response to the multiple external stimuli, coupled to the modular design makes these LMWHs an excellent starting point for the development of smart nanomaterials with applications that include controlled drug release. These hydrogelators, which were discovered by serendipity rather than design, suggest nonetheless a general strategy for the introduction of multiple stimuli-sensitive chemical moieties, to offset the introduction of hydrophilic moieties with additional hydrophobic ones, in order to minimize the upsetting of the critical hydrophobic-hydrophilic balance of the LMWH.
Collapse
Affiliation(s)
- Lilia Milanesi
- Institute of Structural and Molecular Biology, Department of Biological Sciences, School of Science, Birkbeck University of London, London, UK.
| | | | | | | | | |
Collapse
|
221
|
Hydrogel Formation upon Photoinduced Covalent Capture of Macrocycle Stacks from Dynamic Combinatorial Libraries. Angew Chem Int Ed Engl 2011; 50:8384-6. [DOI: 10.1002/anie.201103297] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Indexed: 11/07/2022]
|
222
|
Li J, Carnall JMA, Stuart MCA, Otto S. Hydrogel Formation upon Photoinduced Covalent Capture of Macrocycle Stacks from Dynamic Combinatorial Libraries. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201103297] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
223
|
Chen C, Wang Z, Li Z. Thermoresponsive Polypeptides from Pegylated Poly-l-glutamates. Biomacromolecules 2011; 12:2859-63. [DOI: 10.1021/bm200849m] [Citation(s) in RCA: 203] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Chongyi Chen
- Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Science Beijing, 100190 China
| | - Zhaohui Wang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Science Beijing, 100190 China
| | - Zhibo Li
- Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Science Beijing, 100190 China
| |
Collapse
|
224
|
Paquette MM, Patrick BO, Frank NL. Determining the Magnitude and Direction of Photoinduced Ligand Field Switching in Photochromic Metal–Organic Complexes: Molybdenum–Tetracarbonyl Spirooxazine Complexes. J Am Chem Soc 2011; 133:10081-93. [DOI: 10.1021/ja109776z] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michelle M. Paquette
- Department of Chemistry, P.O. Box 3065, University of Victoria, Victoria, British Columbia, Canada V8W 3 V6
| | - Brian O. Patrick
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Natia L. Frank
- Department of Chemistry, P.O. Box 3065, University of Victoria, Victoria, British Columbia, Canada V8W 3 V6
| |
Collapse
|
225
|
Ku TH, Chien MP, Thompson MP, Sinkovits RS, Olson NH, Baker TS, Gianneschi NC. Controlling and switching the morphology of micellar nanoparticles with enzymes. J Am Chem Soc 2011; 133:8392-5. [PMID: 21462979 PMCID: PMC3756928 DOI: 10.1021/ja2004736] [Citation(s) in RCA: 150] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Micelles were prepared from polymer-peptide block copolymer amphiphiles containing substrates for protein kinase A, protein phosphatase-1, and matrix metalloproteinases 2 and 9. We examine reversible switching of the morphology of these micelles through a phosphorylation-dephosphorylation cycle and study peptide-sequence directed changes in morphology in response to proteolysis. Furthermore, the exceptional uniformity of these polymer-peptide particles makes them amenable to cryo-TEM reconstruction techniques lending insight into their internal structure.
Collapse
Affiliation(s)
- Ti-Hsuan Ku
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093
| | - Miao-Ping Chien
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093
| | - Matthew P. Thompson
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093
| | - Robert S. Sinkovits
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093
| | - Norman H. Olson
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093
| | - Timothy S. Baker
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093
| | - Nathan C. Gianneschi
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093
| |
Collapse
|
226
|
Bowerman CJ, Liyanage W, Federation AJ, Nilsson BL. Tuning β-sheet peptide self-assembly and hydrogelation behavior by modification of sequence hydrophobicity and aromaticity. Biomacromolecules 2011; 12:2735-45. [PMID: 21568346 DOI: 10.1021/bm200510k] [Citation(s) in RCA: 145] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Peptide self-assembly leading to cross-β amyloid structures is a widely studied phenomenon because of its role in amyloid pathology and the exploitation of amyloid as a functional biomaterial. The self-assembly process is governed by hydrogen bonding, hydrophobic, aromatic π-π, and electrostatic Coulombic interactions. A role for aromatic π-π interactions in peptide self-assembly leading to amyloid has been proposed, but the relative contributions of π-π versus general hydrophobic interactions in these processes are poorly understood. The Ac-(XKXK)(2)-NH(2) peptide was used to study the contributions of aromatic and hydrophobic interactions to peptide self-assembly. Position X was globally replaced by valine (Val), isoleucine (Ile), phenylalanine (Phe), pentafluorophenylalanine (F(5)-Phe), and cyclohexylalanine (Cha). At low pH, these peptides remain monomeric because of repulsion of charged lysine (Lys) residues. Increasing the solvent ionic strength to shield repulsive charge-charge interactions between protonated Lys residues facilitated cross-β fibril formation. It was generally found that as peptide hydrophobicity increased, the required ionic strength to induce self-assembly decreased. At [NaCl] ranging from 0 to 1000 mM, the Val sequence failed to assemble. Assembly of the Phe sequence commenced at 700 mM NaCl and at 300 mM NaCl for the less hydrophobic Ile variant, even though it displayed a mixture of random coil and β-sheet secondary structures over all NaCl concentrations. β-Sheet formation for F(5)-Phe and Cha sequences was observed at only 20 and 60 mM NaCl, respectively. Whereas self-assembly propensity generally correlated to peptide hydrophobicity and not aromatic character the presence of aromatic amino acids imparted unique properties to fibrils derived from these peptides. Nonaromatic peptides formed fibrils of 3-15 nm in diameter, whereas aromatic peptides formed nanotape or nanoribbon architectures of 3-7 nm widths. In addition, all peptides formed fibrillar hydrogels at sufficient peptide concentrations, but nonaromatic peptides formed weak gels, whereas aromatic peptides formed rigid gels. These findings clarify the influence of aromatic amino acids on peptide self-assembly processes and illuminate design principles for the inclusion of aromatic amino acids in amyloid-derived biomaterials.
Collapse
Affiliation(s)
- Charles J Bowerman
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, USA
| | | | | | | |
Collapse
|
227
|
Ryan DM, Doran TM, Anderson SB, Nilsson BL. Effect of C-terminal modification on the self-assembly and hydrogelation of fluorinated Fmoc-Phe derivatives. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4029-4039. [PMID: 21401045 DOI: 10.1021/la1048375] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The development of hydrogels resulting from the self-assembly of low molecular weight (LMW) hydrogelators is a rapidly expanding area of study. Fluorenylmethoxycarbonyl (Fmoc) protected aromatic amino acids derived from phenylalanine (Phe) have been shown to be highly effective LMW hydrogelators. It has been found that side chain functionalization of Fmoc-Phe exerts a significant effect on the self-assembly and hydrogelation behavior of these molecules; fluorinated derivatives, including pentafluorophenylalanine (F(5)-Phe) and 3-F-phenylalanine (3-F-Phe), spontaneously self-assemble into fibrils that form a hydrogel network upon dissolution into water. In this study, Fmoc-F(5)-Phe-OH and Fmoc-3-F-Phe-OH were used to characterize the role of the C-terminal carboxylic acid on the self-assembly and hydrogelation of these derivatives. The C-terminal carboxylic acid moieties of Fmoc-F(5)-Phe-OH and Fmoc-3-F-Phe-OH were converted to C-terminal amide and methyl ester groups in order to perturb the hydrophobicity and hydrogen bond capacity of the C-terminus. Self-assembly and hydrogelation of these derivatives was investigated in comparison to the parent carboxylic acid compounds at neutral and acidic pH. It was found that hydrogelation of the C-terminal acids was highly sensitive to solvent pH, which influences the charge state of the terminal group. Rigid hydrogels form at pH 3.5, but at pH 7 hydrogel rigidity is dramatically weakened. C-terminal esters self-assembled into fibrils only slowly and failed to form hydrogels due to the higher hydrophobicity of these derivatives. C-terminal amide derivatives assembled much more rapidly than the parent carboxylic acids at both acidic and neutral pH, but the resultant hydrogels were unstable to shear stress as a function of the lower water solubility of the amide functionality. Co-assembly of acid and amide functionalized monomers was also explored in order to characterize the properties of hybrid hydrogels; these gels were rigid in unbuffered water but significantly weaker in phosphate buffered saline. These results highlight the complex nature of monomer/solvent interactions and their ultimate influence on self-assembly and hydrogelation, and provide insight that will facilitate the development of optimal amino acid LMW hydrogelators for gelation of complex buffered media.
Collapse
Affiliation(s)
- Derek M Ryan
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | | | | | | |
Collapse
|
228
|
Yaşayan G, Saeed AO, Fernández-Trillo F, Allen S, Davies MC, Jangher A, Paul A, Thurecht KJ, King SM, Schweins R, Griffiths PC, Magnusson JP, Alexander C. Responsive hybrid block co-polymer conjugates of proteins–controlled architecture to modulate substrate specificity and solution behaviour. Polym Chem 2011. [DOI: 10.1039/c1py00128k] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
229
|
Shi J, Zhang Z, Li G, Cao S. Biomimetic fabrication of alginate/CaCO3 hybrid beads for dual-responsive drug delivery under compressed CO2. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11838b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
230
|
Fomina N, McFearin CL, Sermsakdi M, Morachis JM, Almutairi A. Low power, biologically benign NIR light triggers polymer disassembly. Macromolecules 2011; 44:8590-8597. [PMID: 22096258 PMCID: PMC3215095 DOI: 10.1021/ma201850q] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Near infrared (NIR) irradiation can penetrate up to 10 cm deep into tissues and be remotely applied with high spatial and temporal precision. Despite its potential for various medical and biological applications, there is a dearth of biomaterials that are responsive at this wavelength region. Herein we report a polymeric material that is able to disassemble in response to biologically benign levels of NIR irradiation upon two-photon absorption. The design relies on the photolysis of the multiple pendant 4-bromo7-hydroxycoumarin protecting groups to trigger a cascade of cyclization and rearrangement reactions leading to the degradation of the polymer backbone. The new material undergoes a 50% Mw loss after 25 sec of ultraviolet (UV) irradiation by single photon absorption and 21 min of NIR irradiation via two-photon absorption. Most importantly, even NIR irradiation at biologically benign laser power is sufficient to cause significant polymer disassembly. Furthermore, this material is well tolerated by cells both before and after degradation. These results demonstrate for the first time a NIR sensitive material with potential to be used for in vivo applications.
Collapse
Affiliation(s)
- Nadezda Fomina
- Skaggs School Pharmacy and Pharmaceutical Sciences, Department of NanoEngineering, Materials Science and Engineering and Biomedical Sciences Programs, University of California at San Diego, La Jolla, California 92093
| | - Cathryn L. McFearin
- Skaggs School Pharmacy and Pharmaceutical Sciences, Department of NanoEngineering, Materials Science and Engineering and Biomedical Sciences Programs, University of California at San Diego, La Jolla, California 92093
| | - Marleen Sermsakdi
- Skaggs School Pharmacy and Pharmaceutical Sciences, Department of NanoEngineering, Materials Science and Engineering and Biomedical Sciences Programs, University of California at San Diego, La Jolla, California 92093
| | - José M. Morachis
- Skaggs School Pharmacy and Pharmaceutical Sciences, Department of NanoEngineering, Materials Science and Engineering and Biomedical Sciences Programs, University of California at San Diego, La Jolla, California 92093
| | - Adah Almutairi
- Skaggs School Pharmacy and Pharmaceutical Sciences, Department of NanoEngineering, Materials Science and Engineering and Biomedical Sciences Programs, University of California at San Diego, La Jolla, California 92093
| |
Collapse
|
231
|
Zelzer M, Ulijn RV. Next-generation peptide nanomaterials: molecular networks, interfaces and supramolecular functionality. Chem Soc Rev 2010; 39:3351-7. [DOI: 10.1039/c0cs00035c] [Citation(s) in RCA: 251] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|