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Strychnos pseudoquina A. St. Hil.: a Brazilian medicinal plant with promising in vitro antiherpes activity
Author(s) -
Boff L.,
Silva I.T.,
Argenta D.F.,
Farias L.M.,
Alvarenga L.F.,
Pádua R.M.,
Braga F.C.,
Leite J.P.V.,
Kratz J.M.,
Simões C.M.O.
Publication year - 2016
Publication title -
journal of applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 1364-5072
DOI - 10.1111/jam.13279
Subject(s) - in vitro , quercetin , chemokine , chemistry , pharmacology , biology , biochemistry , receptor , antioxidant
Aims To investigate the anti‐ HSV and anti‐inflammatory effects of a standardized ethyl acetate extract ( SEAE ) prepared with the stem bark of Strychnos pseudoquina , along with two isolated compounds: quercetin 3‐ O ‐methyl ether (3 MQ ) and strychnobiflavone ( SBF ). Methods and Results The mechanisms of action were evaluated by different methodological strategies. SEAE and SBF affected the early stages of viral infection and reduced HSV ‐1 protein expression. Both flavonoids elicited a concentration‐dependent inhibition of monocyte chemoattractant protein‐1 ( MCP ‐1), whereas 3 MQ reduced the chemokine release more significantly than SBF . Conversely, both compounds stimulated the production of the cytokines TNF ‐ α and IL ‐1‐ β in LPS ‐stimulated cells, especially at the intermediate and the highest tested concentrations. Conclusions SEAE and SBF interfered with various steps of HSV replication cycle, mainly adsorption, postadsorption and penetration, as well as with β and γ viral proteins expression; moreover, a direct inactivation of viral particles was observed. Besides, both flavonoids inhibited MCP ‐1 selectively, a feature that may be beneficial for the development of new anti‐ HSV agents. Significance and Impact of the Study The results indicated that the samples present anti‐ HSV and anti‐inflammatory activities, at different levels, which is an interesting feature since cold and genital sores are accompanied by an inflammation process.