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Materials Science Weekly Newsletter
Recently Published Articles
- Block Copolypeptide Nanoparticles for the Delivery of Ocular Therapeutics
Timo Stukenkemper, Anica Dose, Maria Caballo Gonzalez, Alexander J.J. Groenen, Sarah Hehir, Vanessa Andrés-Guerrero, Rocio Herrero Vanrell and Neil R. Cameron
Article first published online: 17 DEC 2014 | DOI: 10.1002/mabi.201400471
Nanoparticles from amphiphilic block copolypeptides are loaded with the ocular drug dexamethasone. The block copolypeptides are synthesized by sequential polymerization of benzyl-protected glutamic acid and Z-protected lysine N-carboxyanhydrides (NCAs). Selective deprotection of the benzyl glutamate block yields amphiphilic block copolymers that self-assemble into nanoaprticles in aqueous solution. Drug release is almost complete after 16 d in aqueous solution at 37 °C.
- PEG-Poly(l-alanine) Thermogel As a 3D Scaffold of Bone-Marrow-Derived Mesenchymal Stem Cells
Min Hee Park, Hyo Jung Moon, Jin Hye Park, Usha Pramod Shinde, Du Young Ko and Byeongmoon Jeong
Article first published online: 16 DEC 2014 | DOI: 10.1002/mabi.201400426
Polypeptide thermogel prepared by increasing the temperature of cell suspended polymer aqueous solution to 37 °C provides an excellent 3D culture matrix of bone-marrow-derived mesenchymal stem cells. Both in vitro and in vivo studies on three-dimensional culture of the stem cells prove the preferential chondrogenic differentiation of the stem cells in the in situ formed hydrogel.
- Enhanced Efficacy of Pluronic Copolymer Micelle Encapsulated SCR7 against Cancer Cell Proliferation
Franklin John, Jinu George, Supriya V. Vartak, Mrinal Srivastava, P. A. Hassan, V. K. Aswal, Subhas. S. Karki and Sathees C. Raghavan
Article first published online: 16 DEC 2014 | DOI: 10.1002/mabi.201400480
Encapsulation of 5,6-bis-(benzylideneamino)-2-mercaptopyrimidin-4-ol (SCR7) in Pluronic P123 copolymer resulted in accumulation of DNA breaks within the cells, leading to cell cycle arrest at G1 phase and activation of apoptosis. Micellar encapsulation rendered the molecule about 5 times more effective than the parenteral form.
- Self-assembled Monolayers and Nanocomposite Hydrogels of Functional Nanomaterials for Tissue Engineering Applications
Nermin Seda Kehr, Seda Atay and Bahar Ergün
Article first published online: 16 DEC 2014 | DOI: 10.1002/mabi.201400363
Self-assembled monolayers (SAMs) and nanocomposite (NC) hydrogels of functional nanomaterials (NMs) have gained high interest as biomaterials to mimic natural extracellular matrix and to control cell/material interactions. This paper highlights some of the recent reports on the use of SAMs and NC hydrogels of functional NMs as biomaterials particularly in cell culturing applications.
- Semiconductor Polymer Dots Induce Proliferation in Human Gastric Mucosal and Adenocarcinoma Cells
Shouying Li, Jia Chen, Geng Chen, Qiong Li, Kai Sun, Zhen Yuan, Weiping Qin, Hong Xu and Changfeng Wu
Article first published online: 12 DEC 2014 | DOI: 10.1002/mabi.201400428
Highly fluorescent polymer dots induce apparent proliferation in human gastric mucosal and adenocarcinoma cells, as validated by MTT viability studies, cell cycle analysis, ROS generation, and MMP changes. The Pdot-induced cell proliferation represents a distinctive finding as most of other nanoparticles interacted with cells typically cause cell damage and inhibit cell growth.