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Issue 7, 2011
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In situ growth of a thermoresponsive polymer from a genetically engineered elastin-like polypeptide

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Abstract

We report the in situgrowth of a thermoresponsive dumbbell-like polymer conjugate of a genetically engineered triblock elastin-like polypeptide (tELP). Atom transfer radical polymerization (ATRP) was used to directly grow a PEG-like polymer selectively from the first and third blocks of the tELP to form a poly(oligo(ethylene glycol) methyl ether methacrylate) (poly(OEGMA)) brush conjugate with quantitative yield. We found that in situgrowth of poly(OEGMA) from tELP significantly changed the inverse phase transition and rheological behaviors of tELP. Dynamic light scattering (DLS) and turbidity measurements as a function of temperature showed that the inverse phase transition behavior of the conjugate was not determined by the tELP but by poly(OEGMA). Oscillatory rheological measurements indicated that the conjugate started to form a physical hydrogel at a temperature of 55 °C. In vitro enzymatic degradation studies showed that the conjugate could be degraded by collagenase. These results suggest that this class of conjugates may be potentially useful as an injectable, thermoresponsive drug carrier for local drug delivery and as a scaffold for tissue engineering.

Graphical abstract: In situ growth of a thermoresponsive polymer from a genetically engineered elastin-like polypeptide

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Publication details

The article was received on 11 Feb 2011, accepted on 01 Apr 2011 and first published on 17 May 2011


Article type: Paper
DOI: 10.1039/C1PY00074H
Citation: Polym. Chem., 2011,2, 1561-1566
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    In situ growth of a thermoresponsive polymer from a genetically engineered elastin-like polypeptide

    W. Gao, D. Xu, D. W. Lim, S. L. Craig and A. Chilkoti, Polym. Chem., 2011, 2, 1561
    DOI: 10.1039/C1PY00074H

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