Document Detail

A methodology for quantitation and characterization of oligonucleotides in albumin microspheres.
MedLine Citation:
PMID:  19562219     Owner:  NLM     Status:  In-Process    
A fluorescence assay was developed to quantify oligonucleotides (ODNs) encapsulated in bovine serum albumin (BSA) microspheres using antisense to Nuclear Factor-kappaB (NF-kappaB) as a model ODN and employing Oligreen as the fluorescent dye. Methodologies were optimized for the suspension of the microspheres as well as release of the encapsulated ODN using protease digestion. This was followed by the detection and quantitation of the ODN using the Oligreen dye. The Oligreen fluorescence assay gave a concentration-dependent fluorescent interaction with the ODN. Further characterization of the ODN with respect to their structural integrity in non-irradiated and gamma-irradiated antisense encapsulated in BSA microspheres was performed using HPLC, infrared spectroscopy and polyacrylamide gel electrophoresis. Results showed no structural modification of antisense in the BSA microspheres as determined by HPLC retention times for the pure antisense and microsphere-encapsulated ODN. The migration pattern of the antisense in polyacrylamide gels confirmed the absence of significant alterations as a result of the encapsulation process or due to gamma-irradiation. The infrared spectra of non-irradiated and gamma-irradiated antisense to NF-kappaB microspheres also displayed peaks characteristic of the functional groups. The fluorescence assay could also detect NF-kappaB antisense in the serum of rats administered with encapsulated antisense by oral and intravenous routes. This methodology should be valuable for the analysis of BSA-encapsulated antisense ODN and for pharmacokinetic studies during antisense therapy.
Mohammad N Uddin; Duc P Do; S Balakrishna Pai; Sanjay Gayakwad; Carl W Oettinger; Martin J D'Souza
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-04-17
Journal Detail:
Title:  The Analyst     Volume:  134     ISSN:  1364-5528     ISO Abbreviation:  Analyst     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-06-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372652     Medline TA:  Analyst     Country:  England    
Other Details:
Languages:  eng     Pagination:  1483-9     Citation Subset:  IM    
Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, Mercer University, 3001 Mercer University Drive, Atlanta, GA 30341, USA.
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