Abstract | PURPOSE: METHODS: A new pH-sensitive Dex-containing monomer (MA-Gly-Gly-NHN=Dex) was synthesized and copolymerized with HPMA using reversible addition-fragmentation transfer (RAFT) polymerization. The structure of the resulting HPMA copolymer-Dex conjugate (P-Dex) was analyzed and its therapeutic efficacy was evaluated on adjuvant-induced arthritis (AIA) rats. RESULTS: P-Dex was synthesized with controllable molecular weight and polydispersity index (PDI). The Dex content can be controlled by the feed-in ratio of MA-Gly-Gly-NHN=Dex. The P-Dex used for in vitro and in vivo evaluation has a average molecular weight (M (w)) of 34 kDa and a PDI of 1.34. The in vitro drug-release studies showed that the Dex release from the conjugate was triggered by low pH. Clinical measurements, endpoint bone mineral density (BMD) test and histology grading from the in vivo evaluation all suggest that newly synthesized P-Dex has strong and long-lasting anti-inflammatory and joint protection effects. CONCLUSIONS:
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Authors | Xin-Ming Liu, Ling-Dong Quan, Jun Tian, Yazen Alnouti, Kai Fu, Geoffrey M Thiele, Dong Wang |
Journal | Pharmaceutical research
(Pharm Res)
Vol. 25
Issue 12
Pg. 2910-9
(Dec 2008)
ISSN: 0724-8741 [Print] United States |
PMID | 18649124
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Chemical References |
- Methacrylates
- Dexamethasone
- hydroxypropyl methacrylate
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Topics |
- Animals
- Ankle Joint
(pathology)
- Arthritis, Experimental
(drug therapy, pathology)
- Arthritis, Rheumatoid
(drug therapy, pathology)
- Bone Density
(drug effects)
- Dexamethasone
(administration & dosage, chemistry)
- Drug Delivery Systems
- Male
- Methacrylates
(administration & dosage, chemistry)
- Rats
- Rats, Inbred Lew
- Solubility
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