期刊
JOURNAL OF ETHNOPHARMACOLOGY
卷 144, 期 3, 页码 797-801出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.jep.2012.10.012
关键词
Zuccagnia punctata; 7-hydroxyflavanone; 3,7-dihydroxyflavone; 2 ',4 '-dihydroxychalcone; ABCB1 expression; HK-2 cells; P-glycoprotein activity
资金
- Consejo de Investigacion de la Universidad Nacional de Tucuman (CIUNT), Argentina
- Agencia Nacional de Promocion Cientifica y Tecnica (ANPCyT)
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Argentina
- Fondi di Ateneo from Universita di Pisa, Italy
Ethnopharmacological relevance: Zuccagnia punctata extracts (ZpE) are used in ethnomedicine as antimicrobial and anti-inflammatory drugs. The pharmacological properties of ZpE and their polyphenolic components suggest that they may be used as potential modulators on the P-glycoprotein (P-gp) multidrug transporter. P-gp is well known for its role in the acquired drug resistance by tumors following chemotherapy, causing a low drug bioavailability by extruding them out of the cells. Aim of study: To evaluate the effects of ZpE and three of their phenolic components: 7-hydroxyflavanone (HF), 3,7-dihydroxyflavone (DHF) and 2',4'-dihydroxychalcone (DHC) on P-gp activity and expression. Material and methods: The effects of natural products on ABCB1/P-gp function and expression were evaluated by R-123 accumulation assay and western blot analysis using HK-2 cells as experimental model. The ABCB1 mRNA content was determined by SQRT-PCR. Results: The accumulation of R-123 in HK-2 cells was significantly increased by ZpE and DHF, and to a lesser extent by DHC, indicating their roles on the efflux transporter activity. However, HF did not show any effect. HK-2 cells maintained in the presence of ZpE or DHF for 72 h, showed an increase in P-gp expression whereas activity was unchanged or decreased. No changes were observed in ABCB1 mRNA content. Furthermore, in these assay conditions, more sensibility of HK-2 cells to the cytotoxic action of cyclosporine A (P-gp substrate) was observed. Conclusion: These results may suggest an impact of Zuccagnia punctata and some of its components on the pharmacokinetics of drugs that are P-gp substrates, as well as a potential role on multidrug resistance modulation. (C) 2012 Elsevier Ireland Ltd. All rights reserved.
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