title: Synthesis and antiproliferative properties of ibuprofen-oligo(3-hydroxybutyrate) conjugates.
abstract: Synthesis of novel conjugates of the non-steroidal anti-inflammatory drug - ibuprofen with nontoxic oligo(3-hydroxybutyrate) (OHB) is described. Presented results indicate that anionic ring-opening polymerization of (R,S)-beta-butyrolactone initiated with an alkali metal salt of (S)-(+)-2-(4-isobutylphenyl)propionic acid (ibuprofen) may constitute a convenient method of conjugation of selected drugs with biodegradable OHB. Furthermore using the MTT cell proliferation assay we demonstrated that ibuprofen conjugated with OHB exhibited significantly increased, as compared to free ibuprofen, potential to inhibit proliferation of HT-29 and HCT 116 colon cancer cells. However, the conjugates of ibuprofen and OHB are less toxic as was shown in oral acute toxicity test in rats. Although the mechanism of antiproliferative activity of ibuprofen-OHB conjugates (Ibu-OHB) has to be established, we suggest that partially it can be related to more effective cellular uptake of the conjugate than the free drug. This assumption is based on the observation of much more efficient accumulation of a marker compound - OHB conjugated with fluorescein, in contrast to fluorescein sodium salt, which entered cells inefficiently. Further characterization of biological properties of the ibuprofen-OHB conjugates would provide insight into the mechanism of their antiproliferative effect and assess the potential relevance of their anticancer activity.
authors.affiliation: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34, M. Curie-Skłodowska St., 41-819 Zabrze, Poland.
authors.forename: Barbara
authors.initials: B
authors.lastname: Zawidlak-Wegrzyńska
authors.forename: Michał
authors.initials: M
authors.lastname: Kawalec
authors.forename: Izabela
authors.initials: I
authors.lastname: Bosek
authors.forename: Maria
authors.initials: M
authors.lastname: Łuczyk-Juzwa
authors.forename: Grazyna
authors.initials: G
authors.lastname: Adamus
authors.forename: Aleksandra
authors.initials: A
authors.lastname: Rusin
authors.forename: Piotr
authors.initials: P
authors.lastname: Filipczak
authors.forename: Magdalena
authors.initials: M
authors.lastname: Głowala-Kosińska
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Wolańska
authors.forename: Zdzisław
authors.initials: Z
authors.lastname: Krawczyk
authors.forename: Piotr
authors.initials: P
authors.lastname: Kurcok
mesh_terms: D020155:3-Hydroxybutyric Acid / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical; D005260:Female; D006801:Humans; D007052:Ibuprofen / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D015394:Molecular Structure; D051381:Rats; D017208:Rats, Wistar; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D000970:Antineoplastic Agents; D020155:3-Hydroxybutyric Acid; D007052:Ibuprofen