PMID: 11344456May 10, 2001Paper

Engineering temperature-sensitive poly(N-isopropylacrylamide) polymers as carriers of therapeutic proteins

Biotechnology and Bioengineering
Hasan UludağT Gao

Abstract

This study was carried out to engineer N-isopropylacrylamide (NiPAM) polymers that contain protein-reactive N-acryloxysuccinimide (NASI) and hydrophobic alkylmethacrylates (AMAs). These thermoreversible, protein-conjugating polymers hold potential for retention of therapeutic proteins at an application site where tissue regeneration is desired. The lower critical solution temperatures (LCST) of the polymers were effectively controlled by the AMA mole content. The AMAs with longer side-chains were more effective in lowering the LCST. Polymers without NASI exhibited a stable LCST in phosphate buffer and in serum over a 10-day study period. The LCST of polymers containing NASI was found to increase over time in phosphate buffer, but not in serum-containing medium. The LCST increase in phosphate buffer was proportional to the AMA content. The feasibility of localizing a therapeutic protein, recombinant human bone morphogenetic protein-2 (rhBMP-2), to a site of application was explored in a rat intramuscular injection model. The results indicated that polymers capable of conjugating to rhBMP-2 were most effective in localizing the protein irrespective of the LCST (13-25 degrees C). For polymers with no NASI groups, a lower LCST resu...Continue Reading

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Citations

Jun 21, 2001·Journal of Biomedical Materials Research·T Gao, H Uludag
Jun 25, 2010·Journal of Biomaterials Science. Polymer Edition·K C Remant Bahadur, Hasan Uludağ
Oct 25, 2006·Applied Microbiology and Biotechnology·Pall ThordarsonKelly Velonia
Feb 2, 2002·Journal of Drug Targeting·S A Gittens, H Uludag
Nov 22, 2005·Expert Opinion on Drug Delivery·Mathew VarkeyHasan Uludag
Jan 9, 2015·Preparative Biochemistry & Biotechnology·Rubab Mahmood
Apr 12, 2012·Journal of Biomedical Materials Research. Part a·M A Jafar MazumderHeather Sheardown
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Feb 28, 2007·Chemical Society Reviews·Sufeng ZhangHasan Uludağ
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