Abstract：
:The controversial anti-proliferative effects of Echinacea purpurea (L.) Moench (Asteraceae) might be related to different plant metabolites contained in plant samples, extracts and products. The influence of bacterial endophytes on the synthesis of bioactive compounds in the medicinal plants has been previously demonstrated but there are only few studies addressing anticancer effects and mechanisms of E. purpurea extracts following endophytic colonization. The present study aimed to test and compare the lactate dehydrogenase (LDH) inhibition potential of n-hexane and methanol extracts from in vitro endophyte non-inoculated and inoculated E. purpurea plants. An in vitro model was previously set up to perform the infection of axenic E. purpurea plants with bacterial endophytic strains isolated from E. purpurea aerial part. Only methanol extracts showed LDH5 inhibition, in particular the richest in chicoric acid and most strongly inhibiting extract was obtained from inoculated stem and leaves of E. purpurea (IC50 = 0.9 mg/ml). Chicoric acid showed an IC50 value (66.7 µM) in enzymatic assays better than that of the reference compound galloflavin. Modeling studies were carried out to suggest the putative interaction mode of chicoric acid in the enzyme active site. This in vitro model on plant-bacterial interaction may lead to obtain extracts from plants enriched in bioactive compounds and it is a new approach for the discovery of novel anticancer compounds.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Maggini V,De Leo M,Granchi C,Tuccinardi T,Mengoni A,Gallo ER,Biffi S,Fani R,Pistelli L,Firenzuoli F,Bogani Pdoi
10.1038/s41598-019-47329-8subject
Has Abstractpub_date
2019-07-26 00:00:00pages
10897issue
1issn
2045-2322pii
10.1038/s41598-019-47329-8journal_volume
9pub_type
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