These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.
Pubmed for Handhelds
PUBMED FOR HANDHELDS
Search MEDLINE/PubMed
Title: PEGylated thermo-sensitive poly(amidoamine) dendritic drug delivery systems. Author: Zhao Y, Fan X, Liu D, Wang Z. Journal: Int J Pharm; 2011 May 16; 409(1-2):229-36. PubMed ID: 21316434. Abstract: Thermo-sensitive dendrimers hold promise in various biomedical and pharmaceutical applications due to their stimuli-responsive properties. However, for such systems there are still certain unaddressed issues e.g. the undesired toxicity, immunogenicity and short blood circulation time. PEGylation is a potential approach to solve these above problems. The aims of this study were to engineer PEGylated thermo-sensitive dendritic derivatives and to investigate their temperature sensitivity and drug release behaviour therein. Linear poly(N-isopropylacrylamide) (PNIPAAm) and methoxy poly(ethylene glycol) (MPEG) were attached to the surface of polyamidoamine (PAMAM) dendrimers to generate PAMAM-g-PNIPAAm and PAMAM-g-PNIPAAm-co-PEG. PAMAM-g-PNIPAAm exhibited the lowest critical solution temperature (LCST) of ca. 32°C, whereas PAMAM-g-PNIPAAm-co-PEG showed a LCST of ca. 35°C. Indomethacin was used as a model molecule to examine the drug release profiles from both types of dendritic polymers. Results showed that such thermo-sensitive PAMAM derivatives could manipulate drug release simply by controlling the temperature above or below the LCST. At 37°C a prolonged drug release was obtained for both systems with less than 30% of drug was released over 12 h, whilst the release rate is much faster at 30°C and ca. 90% of drug was released over 12 h. The results obtained suggest that these thermo-sensitive PAMAM derivatives could be potential drug delivery systems to achieve controlled drug release.[Abstract] [Full Text] [Related] [New Search]