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J Ethnopharmacol. 2017 Feb 23;198:109-121. doi: 10.1016/j.jep.2016.12.049. Epub 2017 Jan 2.

Honeysuckle aqueous extract and induced let-7a suppress dengue virus type 2 replication and pathogenesis.

Author information

1
Department of Medical Research, Chiayi Christian Hospital, Chiayi, Taiwan.
2
Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan.
3
College of Biological Life Science, Nanjing University, Nanjing 210023, PR China.
4
Institute of Bioinformatics and Systems Biology, National Chiao Tung University, Hsinchu, Taiwan.
5
Institute of Bioinformatics and Systems Biology, National Chiao Tung University, Hsinchu, Taiwan; Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan; Molecular Bioinformatics Center, National Chiao Tung University, Hsinchu, Taiwan.
6
Department of Animal Science and Biotechnology, Tunghai University, Taichung, Taiwan.
7
Department of Medical Laboratory Science and Biotechnology, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan.
8
Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan. Electronic address: a713@mail.ncku.edu.tw.
9
College of Biological Life Science, Nanjing University, Nanjing 210023, PR China. Electronic address: dr.gan1604@gmail.com.

Abstract

ETHNOPHARMACOLOGICAL RELEVANCE:

Honeysuckle (Lonicera japonica Thunb.), a traditional Chinese herb, has widely been used to treat pathogen infection. However, the underlying-mechanism remains elusive.

AIMS OF THE STUDY:

To reveal the host microRNA (miRNA) profile with the anti-viral activity after honeysuckle treatment.

MATERIALS AND METHODS:

Here we reveal the differentially expressed miRNAs by Solexa® deep sequencing from the blood of human and mice after the aqueous extract treatment. Among these overexpressed innate miRNAs both in human and mice, let-7a is able to target the NS1 region (nt 3313-3330) of dengue virus (DENV) serotypes 1, 2 and 4 predicated by the target predication software.

RESULTS:

We confirmed that let-7a could target DENV2 at the predicated NS1 sequence and suppress DENV2 replication demonstrated by luciferase-reporter activity, RT-PCR, real-time PCR, Western blotting and plaque assay. ICR-suckling mice consumed honeysuckle aqueous extract either before or after intracranial injection with DENV2 showed decreased levels of NS1 RNA and protein expression accompanied with alleviated disease symptoms, decreased virus load, and prolonged survival time. Similar results were observed when DENV2-infected mice were intracranially injected with let-7a.

CONCLUSION:

We reveal that honeysuckle attenuates DENV replication and related pathogenesis in vivo through induction of let-7a expression. This study opens a new direction for prevention and treatment of DENV infection through induction of the innate miRNA let-7a by honeysuckle.

KEYWORDS:

Dengue virus replication; Honeysuckle; Let-7a

PMID:
28052239
DOI:
10.1016/j.jep.2016.12.049
[Indexed for MEDLINE]

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