Article (Scientific journals)
Chemical constituents, cytotoxic, antifungal and antimicrobial properties of Centaurea diluta Ait. subsp. algeriensis (Coss. & Dur.) Maire
Zater, H.; Huet, J; Fontaine, V. et al.
2016In Asian Pacific Journal of Tropical Medicine, 9 (6), p. 554-561
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Abstract :
[en] Objective: To investigate the chemical composition of a moderately polar extract (CHCl3 soluble part of the MeOH-H2O extract) obtained from the aerial parts (leaves and flowers) of Centaurea diluta Ait. subsp. algeriensis (Coss. & Dur.) Maire, a species endemic to Algeria and Morocco on which no reports are available to date. To evaluate in vitro the cytotoxic, antifungal and antimicrobial activities of this extract and the cytotoxic and antimicrobial activities of its isolated secondary metabolites. Methods: The cytotoxic effects of the extract were investigated on 3 human cancer cell lines i.e. the A549 non-small-cell lung carcinoma (NSCLC), the MCF7 breast adenocarcinoma and the U373 glioblastoma using a MTT colorimetric assay. Biological data allowed to guide the fractionation of the extract by separation and purification on silica gel 60 (CC and TLC). The isolated compounds which were characterized by spectral analysis, mainly HR-ESIMS, HR-EIMS, UV and NMR experiments (1H, 13C, COSY, ROESY, HSQC and HMBC) and comparison of their spectroscopic data with those reported in the literature, were evaluated for cytotoxic activities on six cancer cell lines (A549, MCF7, U373, Hs683 human glioma, PC3 human prostate and B16-F10 murine melanoma). The direct and indirect antibacterial and antifungal activities were determined using microdilution methods for the raw extract and TLC-bioautography and microdilution methods against standard and clinical strains for the isolated compounds. Results: The raw extract reduced cell viability with IC50s of 27, 25 and 21 mg/mL on A549, MCF7 and U373, respectively. Five secondary metabolites: two phenolic compounds (vanillin 1, paridol 3), a lignan [(-)-arctigenin 2] and two flavonoid aglycones (eupatilin 4 and jaceosidin 5), were then isolated from this extract. Moderate cytotoxic effects were observed for (-)-arctigenin 2 (IC50s: 28 and 33 mM on Hs683 and B16-F10, respectively), eupatilin 4 (IC50s: 33 and 47 mM on B16-F10 and PC3, respectively) and jaceosidin 5 (IC50s: 32 and 40 mM on PC3 and B16-F10, respectively). Conclusions: All the isolated compounds were described for the first time from this species. Although inactive against 7 tested microorganisms (fungi, bacteria and yeast, human or plant pathogens), the raw extract was able to potentiate the effect of beta-lactam antibiotics on methicillin-resistant Staphylococcus aureus (MRSA), reducing the minimal inhibitory concentrations (MICs) by a factor of 2-32-fold. No synergy was found between the extract and streptomycin. From the five isolated compounds only jaseosidin 5 showed a moderate antimicrobial activity.
Disciplines :
Pharmacy, pharmacology & toxicology
Chemistry
Author, co-author :
Zater, H.
Huet, J
Fontaine, V.
Benayache, S
Stévigny, Caroline
Duez, Pierre  ;  Université de Mons > Faculté de Médecine et de Pharmacie > Service de Chimie thérapeutique et Pharmacognosie
Benayache, F
Language :
English
Title :
Chemical constituents, cytotoxic, antifungal and antimicrobial properties of Centaurea diluta Ait. subsp. algeriensis (Coss. & Dur.) Maire
Publication date :
23 November 2016
Journal title :
Asian Pacific Journal of Tropical Medicine
ISSN :
1995-7645
Publisher :
Wolters Kluwer Medknow Publications
Volume :
9
Issue :
6
Pages :
554-561
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
M136 - Chimie thérapeutique et Pharmacognosie
Research institute :
R550 - Institut des Sciences et Technologies de la Santé
Available on ORBi UMONS :
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