Evidence of synergistic activity of medicinal plant extracts against neuraminidase inhibitor resistant strains of influenza

Journal article


Rajasekaran, Dhivya, Palombo, Enzo, Yeo, Tiong Chia, Ley, Diana, Tu, Chu Lee, Malherbe, Francois and Grollo, Lara. (2014). Evidence of synergistic activity of medicinal plant extracts against neuraminidase inhibitor resistant strains of influenza. Advances in Microbiology. 4(16), pp. 1260 - 1277. https://doi.org/10.4236/aim.2014.416136
AuthorsRajasekaran, Dhivya, Palombo, Enzo, Yeo, Tiong Chia, Ley, Diana, Tu, Chu Lee, Malherbe, Francois and Grollo, Lara
Abstract

The frequent emergence of drug resistant influenza viral strains emphasizes the urgent and continual need to develop new antiviral drugs. Given the encouraging findings of previous studies on antiviral compounds from plant sources, this study focused on medicinal plants from Borneo that were traditionally used to treat symptoms of influenza infection. Following the promising results of earlier investigations, four plant extracts that demonstrated multiple modes of viral inhibition were studied against wild-type and neuraminidase (NA) inhibitor-resistant strains of Types A and B influenza viruses. The extracts exhibited more pronounced activities against the wild-type viruses than the NA inhibitor-resistant strains. Variations in the antiviral potential of the extracts collected from different parts of the same plant were also evidenced in the in vitro micro-inhibition assays. Even though all plant extracts affected NA activity of all viruses, only two extracts demonstrated hemagglutination inhibitory (HI) activities against Type A pandemic H1N1 and Type B viruses. Furthermore, Receptor Destroying Enzyme (RDE) treatments of extracts exhibiting HI activities indicated the presence of sialic acid (SA)-like component(s) that may be responsible for HI activity. Since the antiviral potential of extracts was not completely suppressed by RDE, the possibility of non SA-like antiviral components cannot be ruled out. Therefore, synergistic activity between SA-like and non SA-like components contained in the plant extracts may be responsible for the demonstrated antiviral potential. The results also indicated the presence of non SA-like components that may act against other viral proteins apart from hemagglutinin (HA) and NA.

Year2014
JournalAdvances in Microbiology
Journal citation4 (16), pp. 1260 - 1277
ISSN2165-3402
Digital Object Identifier (DOI)https://doi.org/10.4236/aim.2014.416136
Page range1260 - 1277
Research GroupSchool of Behavioural and Health Sciences
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