Cited by 128Mosquito-borne diseases and controlMicroRNA in disease regulationNeuroinflammation and Neurodegeneration Mechanisms

The DOI matches its Crossref record; 48 of the 48 references it cites were found in a registry or an index; 14 of the 50 sources its claims cite were checked for support.

miR-155 induction in microglial cells suppresses Japanese encephalitis virus replication and negatively modulates innate immune responses

Open access
Pareek, Siddhika, Roy, Saugata, Kumari, Bharti, Jain, Pratistha, Banerjee, Arup, Vrati, Sudhanshu·2014·Journal of Neuroinflammation

Abstract

BACKGROUND: Microglial cells, which are resident macrophages of the central nervous system, play important roles in immune responses and pathogenesis. Japanese encephalitis virus (JEV) is a neurotropic virus that infects microglial cells in brain. Several microRNAs including miR-155 and miR-146a play an important role in defining the microglia inflammatory profile. In this study, we have investigated the effect of miR-155 and miR-146a modulation on JEV infection as well as innate immune responses in human microglial cells. METHODS: In vitro studies were performed in JEV-infected human microglial CHME3 cells. miR-155 or miR-146a were overexpressed and total RNA and protein were extracted following JEV-infection. Expression of genes involved in innate immune responses was studied by PCR array, quantitative real-time PCR (qPCR), western blot and Fluorescence activated cell sorter (FACS). JEV replication was monitored by studying the viral RNA by qPCR, protein by western blot, and titres by plaque assay. RESULTS: Overexpression of miR-155 in CHME3 cells resulted in significantly reduced JEV replication whereas miR-146a overexpression had an insignificant effect. Additionally, interferon regulatory factor 8 (IRF8) and complement factor H (CFH) were induced during JEV infection; however, this induction was attenuated in miR-155 overexpressing cells following JEV infection. Further, JEV-induced NF-κB regulated downstream gene expression was attenuated. Interestingly, an increased level of CD45, a negative regulator of microglia activation and a reduced phosphorylated-Signal Transducers and Activators of Transcription (p-STAT1) expression was observed in miR-155 overexpressing cells upon JEV infection. CONCLUSION: Induction of miR-155 in human microglial cells may negatively modulate JEV-induced innate immune gene expression and may have a beneficial role in limiting JEV replication in human microglial cells.

Overview

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Written from the paper’s full text.

TL;DR

In human microglial CHME3 cells, JEV infection induces miR-155, and miR-155 overexpression suppresses JEV replication while attenuating JEV-induced innate immune gene expression. miR-146a overexpression had little effect on JEV replication or the measured responses.

Key findings

  • miR-155 overexpression significantly reduced JEV NS1 protein, JEV RNA, and virus titre at 24 h post-infection, with approximately 1 log2 suppression of JEV titres; miR-146a overexpression had no significant effect.
  • JEV infection induced IRF8 and complement factor H (CFH); miR-155 overexpression attenuated these inductions and also reduced JEV-induced IFN-β and interferon-stimulated gene (ISG) expression, effects reversed by a miR-155 inhibitor.
  • In an NF-κB PCR array covering 84 genes, control mimic + JEV cells had 26 genes upregulated >2-fold, while miR-155 overexpressing + JEV cells had 32 upregulated; 19 were common, and 16 of these 19 showed attenuated expression in miR-155 cells.
  • miR-155 overexpression increased CD45 surface expression, reduced p-STAT1, and reduced IL-1β, TNF-α, and IL-10 mRNA, while IL-4 was not affected.

Methods

  • In vitro studies used human microglial CHME3 cells transfected with miRNA mimics or inhibitors (25 pmol), then infected with JEV strain P20778 at MOI = 5; PS cells were used for virus propagation and plaque assay.
  • RNA and protein were extracted at different times post-infection and analysed by qPCR, TaqMan miRNA assays, RT2 Profiler NF-κB PCR array, western blot, and FACS.
  • Experiments were performed in triplicate; statistical analysis used one-way ANOVA with Bonferroni’s multiple comparison tests and unpaired Student’s t-test, with P < 0.05 considered significant.

Limitations

  • The paper states that further in vivo study is needed and that additional in vitro and in vivo studies are required to understand miR-155’s role in switching microglial activation toward a neuroprotective state.
  • The paper reports that IRF8 3′-UTR luciferase target validation showed no change in miR-155 overexpressing cells (data not shown), and in silico analysis found no potential miR-155 target sites in JEV RNA.
  • Evident from the text: all results come from a single in vitro human microglial cell line (CHME3) using overexpression (approximately 100-fold), and the authors note a discrepancy with a mouse BV-2 study where miR-155 rose approximately 4-fold and appeared pro-inflammatory, so cell type, expression level, and virus strain may limit generalizability.

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Integrity signals

Registry

Crossref · 10.1186/1742-2094-11-97

Cites

48 of 48 references verified0 citation errors · 0 not checkable

Statistics

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Figures

Figure 1 Differential expression of NeurimmiRs in human microglial cells after JEV infection. CHME3 cells were mock-infected or infected with JEV. Total RNA was isolated from cells at different time points. (A) Relative abundance of six NeurimmiRs obtained from human miRNA microarray was shown as log2 fold-change. (B) Levels of miR-155 and miR-146a were determined by qPCR and plotted as relative to that seen in the mock-infected cells. Data were normalized against U6 snRNA. h, hours; JEV, Japanese encephalitis virus; pi, post-infection. *, P <0.05; **, P <0.005.
Figure 1 Differential expression of NeurimmiRs in human microglial cells after JEV infection. CHME3 cells were mock-infected or infected with JEV. Total RNA was isolated from cells at different time points. (A) Relative abundance of six NeurimmiRs obtained from human miRNA microarray was shown as log2 fold-change. (B) Levels of miR-155 and miR-146a were determined by qPCR and plotted as relative to that seen in the mock-infected cells. Data were normalized against U6 snRNA. h, hours; JEV, Japanese encephalitis virus; pi, post-infection. *, P <0.05; **, P <0.005.CC BY · PubMed Central
Figure 2 JEV replication in human microglial cells. CHME3 cells were transfected with control mimic (CM), mimic-155 (M-155) and mimic-146a (M-146a) followed by JEV infection. Virus replication was monitored at 24 hours pi. (A) JEV NS1 expression was studied using western blotting. (B) Relative levels of JEV RNA were quantified by qPCR. Data were normalized against GAPDH RNA. (C) JEV titres in culture supernatants were determined by plaque assay. GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; JEV, Japanese encephalitis virus; pi, post-infection. *, P <0.05; **, P <0.005.
Figure 2 JEV replication in human microglial cells. CHME3 cells were transfected with control mimic (CM), mimic-155 (M-155) and mimic-146a (M-146a) followed by JEV infection. Virus replication was monitored at 24 hours pi. (A) JEV NS1 expression was studied using western blotting. (B) Relative levels of JEV RNA were quantified by qPCR. Data were normalized against GAPDH RNA. (C) JEV titres in culture supernatants were determined by plaque assay. GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; JEV, Japanese encephalitis virus; pi, post-infection. *, P <0.05; **, P <0.005.CC BY · PubMed Central
Figure 3 JEV-induced IFN-β mRNA expression in human microglial cells. CHME3 cells were transfected with CM, M-155, M-146a, or I-155 and mock-infected or infected with JEV 24 hours later. Total RNA was extracted 24 hours pi. and levels of various transcripts were determined by qPCR normalized against those of GAPDH. (A) Relative IFNβ mRNA expression in JEV-infected cells compared to mock-infected cells. (B) Relative abundance of various ISG transcripts in JEV-infected cells compared to mock-infected cells. (C) Relative expression of IFIT1 in M-155 and I-155 transfected cells compared to CM transfected cells following JEV infection. CM, control mimic; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; I-155, h, hours; inhibitor 155; IFN, interferon; ISG, interferon-stimulated genes; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155; pi, post-infection. **, P <0.005.
Figure 3 JEV-induced IFN-β mRNA expression in human microglial cells. CHME3 cells were transfected with CM, M-155, M-146a, or I-155 and mock-infected or infected with JEV 24 hours later. Total RNA was extracted 24 hours pi. and levels of various transcripts were determined by qPCR normalized against those of GAPDH. (A) Relative IFNβ mRNA expression in JEV-infected cells compared to mock-infected cells. (B) Relative abundance of various ISG transcripts in JEV-infected cells compared to mock-infected cells. (C) Relative expression of IFIT1 in M-155 and I-155 transfected cells compared to CM transfected cells following JEV infection. CM, control mimic; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; I-155, h, hours; inhibitor 155; IFN, interferon; ISG, interferon-stimulated genes; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155; pi, post-infection. **, P <0.005.CC BY · PubMed Central
Figure 4 JEV-induced IRF8 expression in human microglial cells. (A) CHME3 cells were mock-infected or infected with JEV and total RNA was extracted from cells harvested at different time points. Relative levels of IRF8 and IRF3 transcripts in JEV-infected cells compared to those in mock-infected cells are presented in the left panel. GAPDH expression was used to normalize the data. The right panel shows IRF8 protein levels during JEV infection. (B) CHME3 cells were transfected with CM, M-155 and I-155 followed by JEV infection. The left panel shows the relative abundance of IRF8 measured by qPCR in JEV infected cells in comparison to that in mock-infected cells. GAPDH expression was used to normalize the data. The right panel shows the western blot of IRF8. CM, control mimic; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; h, hours; I-146a, inhibitor 146a; I-155, inhibitor 155; IRF, interferon regulatory factor; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155; pi, post-infection. *, P <0.05.
Figure 4 JEV-induced IRF8 expression in human microglial cells. (A) CHME3 cells were mock-infected or infected with JEV and total RNA was extracted from cells harvested at different time points. Relative levels of IRF8 and IRF3 transcripts in JEV-infected cells compared to those in mock-infected cells are presented in the left panel. GAPDH expression was used to normalize the data. The right panel shows IRF8 protein levels during JEV infection. (B) CHME3 cells were transfected with CM, M-155 and I-155 followed by JEV infection. The left panel shows the relative abundance of IRF8 measured by qPCR in JEV infected cells in comparison to that in mock-infected cells. GAPDH expression was used to normalize the data. The right panel shows the western blot of IRF8. CM, control mimic; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; h, hours; I-146a, inhibitor 146a; I-155, inhibitor 155; IRF, interferon regulatory factor; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155; pi, post-infection. *, P <0.05.CC BY · PubMed Central
Figure 5 JEV-induced NF-κB targeted gene expression in human microglial cells. (A) CHME3 cells were treated for 6 hours with NF-κB inhibitor (25 μM) or PI3K inhibitor (10 μM) using DMSO as a vehicle. This was followed by JEV infection for 24 hours. Total RNA was extracted and relative IFN-β mRNA expression was measured using qPCR in inhibitor-treated cells compared to the vehicle-treated cells. GAPDH was used to normalize the data. (B) CHME3 cells were transfected with CM, M-155 or M-146a and infected with JEV 24 hours later. Total RNA was extracted 24 hours pi and levels of various NF-κB targeted genes were studied using PCR array. Hierarchical clustering represents the co-regulated genes across the groups. Relative gene expression levels were depicted according to the colour scale (green - downregulation, red - upregulation). Gene designations are listed to the left. (C) Expression of NF-κB targeted genes expression that were found to be common (n = 19) in PCR array among three different groups (CM + JEV, M-146a + JEV, and M-155 + JEV) in CHME3 cells. An attenuated expression of JEV-induced genes was observed in miR-155 overexpressing cells. (D) Expression of IL-12B, PTGS-2, CCR5 and IL-4 was studied by qPCR. The figure shows a relative abundance of transcripts in JEV-infected, mimic-transfected CHME3 cells when compared with those in cells transfected with the mimics. GAPDH was used to normalize the data. (E) Expression of MyD88 and Ikkϵ in miR-155 or miR-146a overexpressing JEV-infected CHME3 cells as seen by western blotting. (F) Expression of different mRNAs in miR-155 overexpressing CHME3 cells following infection with JEV. CM, control mimic; DMSO, Dimethyl sulfoxide; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; IFN, interferon; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155.
Figure 5 JEV-induced NF-κB targeted gene expression in human microglial cells. (A) CHME3 cells were treated for 6 hours with NF-κB inhibitor (25 μM) or PI3K inhibitor (10 μM) using DMSO as a vehicle. This was followed by JEV infection for 24 hours. Total RNA was extracted and relative IFN-β mRNA expression was measured using qPCR in inhibitor-treated cells compared to the vehicle-treated cells. GAPDH was used to normalize the data. (B) CHME3 cells were transfected with CM, M-155 or M-146a and infected with JEV 24 hours later. Total RNA was extracted 24 hours pi and levels of various NF-κB targeted genes were studied using PCR array. Hierarchical clustering represents the co-regulated genes across the groups. Relative gene expression levels were depicted according to the colour scale (green - downregulation, red - upregulation). Gene designations are listed to the left. (C) Expression of NF-κB targeted genes expression that were found to be common (n = 19) in PCR array among three different groups (CM + JEV, M-146a + JEV, and M-155 + JEV) in CHME3 cells. An attenuated expression of JEV-induced genes was observed in miR-155 overexpressing cells. (D) Expression of IL-12B, PTGS-2, CCR5 and IL-4 was studied by qPCR. The figure shows a relative abundance of transcripts in JEV-infected, mimic-transfected CHME3 cells when compared with those in cells transfected with the mimics. GAPDH was used to normalize the data. (E) Expression of MyD88 and Ikkϵ in miR-155 or miR-146a overexpressing JEV-infected CHME3 cells as seen by western blotting. (F) Expression of different mRNAs in miR-155 overexpressing CHME3 cells following infection with JEV. CM, control mimic; DMSO, Dimethyl sulfoxide; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; IFN, interferon; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155.CC BY · PubMed Central
Figure 6 JEV-induced CD45 expressions in human microglial cells. (A) CHME3 cells were transfected with CM, M-155 or I-155 followed by JEV infection for 24 hours. Cells were harvested and examined for CD45 expression by FACS. Data were analyzed by FlowJo software (Tree Star). Y-axis represents the number of events normalized according to FlowJo algorithms. (B)p-STAT1 and STAT1 expression was studied in JEV-infected cells by western blotting. (C) Relative expression of TNF-α, IL-1β, IL-4 and IL10 mRNA in M-155 transfected cells infected with JEV when compared with those transfected with CM. The data were normalized against GAPDH. CM, control mimic; FACS, fluorescence activated cell sorter; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; I-155, inhibitor 155; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155.
Figure 6 JEV-induced CD45 expressions in human microglial cells. (A) CHME3 cells were transfected with CM, M-155 or I-155 followed by JEV infection for 24 hours. Cells were harvested and examined for CD45 expression by FACS. Data were analyzed by FlowJo software (Tree Star). Y-axis represents the number of events normalized according to FlowJo algorithms. (B)p-STAT1 and STAT1 expression was studied in JEV-infected cells by western blotting. (C) Relative expression of TNF-α, IL-1β, IL-4 and IL10 mRNA in M-155 transfected cells infected with JEV when compared with those transfected with CM. The data were normalized against GAPDH. CM, control mimic; FACS, fluorescence activated cell sorter; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; I-155, inhibitor 155; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155.CC BY · PubMed Central
Figure 7 JEV-induced CFH expression in human microglial cells. (A) CHME3 cells were mock-infected or infected with JEV. Total RNA was extracted from cells at different time points. The relative mRNA levels of CFH (left panel) and CD59, CD55, and CD46 (right panel) were determined in JEV-infected cells using qPCR in comparison to that in mock-infected cells. GAPDH was used as the normalizing control. (B) CHME3 cells were treated with either DMSO as a vehicle, NF-κB (25 μM) or PI3K inhibitor (10 μM) in DMSO for 6 hours followed by JEV infection for 24 hours. Total RNA was extracted and relative levels of CFH expression was studied by qPCR in different treatments when compared with vehicle-treated cells. (C) CHME3 was transfected with CM, M-155 or M-146a. After 24 hours of transfection cells were either mock-infected or infected with JEV for another 24 hours. Total RNA was extracted and relative levels of CFH mRNA determined in JEV-infected cells in comparison to those seen in mock-infected cells. CFH, complement factor H; CM, control mimic; DMSO, Dimethyl sulfoxide; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; h, hours; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155; pi, post-infection. *, P <0.05; **, P <0.005.
Figure 7 JEV-induced CFH expression in human microglial cells. (A) CHME3 cells were mock-infected or infected with JEV. Total RNA was extracted from cells at different time points. The relative mRNA levels of CFH (left panel) and CD59, CD55, and CD46 (right panel) were determined in JEV-infected cells using qPCR in comparison to that in mock-infected cells. GAPDH was used as the normalizing control. (B) CHME3 cells were treated with either DMSO as a vehicle, NF-κB (25 μM) or PI3K inhibitor (10 μM) in DMSO for 6 hours followed by JEV infection for 24 hours. Total RNA was extracted and relative levels of CFH expression was studied by qPCR in different treatments when compared with vehicle-treated cells. (C) CHME3 was transfected with CM, M-155 or M-146a. After 24 hours of transfection cells were either mock-infected or infected with JEV for another 24 hours. Total RNA was extracted and relative levels of CFH mRNA determined in JEV-infected cells in comparison to those seen in mock-infected cells. CFH, complement factor H; CM, control mimic; DMSO, Dimethyl sulfoxide; GAPDH, Glyceraldehyde 3-phosphate dehydrogenase; h, hours; JEV, Japanese encephalitis virus; M-146a, mimic 146a; M-155, mimic 155; pi, post-infection. *, P <0.05; **, P <0.005.CC BY · PubMed Central

Verification

Claims the paper makes

59 Own result · 22 Own interpretation · 16 Not checked yet · 6 Partly supported · 6 Own method · 5 No full text of the sources · 3 Supported · 2 Sources not found · accuracy not yet measured

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  • Probably not a substantial claim. 33
  • It may state two separate claims as one. 33
  • The quote only partly states this claim. 3
57 of 57
  • The paper relies on this without support.

    JEV infection of microglia leads to neuronal cell death through uncontrolled production of pro-inflammatory cytokines.

    “However, substantial evidence suggests that infection of microglia by JEV may actually lead to neuronal cell death through uncontrolled production of pro-inflammatory cytokines.”
  • The paper relies on this without support.

    NeurimmiRs play an important role in JEV replication and immunopathology.

    “Since JEV is a neurotropic virus it is likely that NeurimmiRs play an important role in virus replication and immunopathology.”
  • The paper relies on this without support.

    IRF8 plays an essential role in microglial activation and is involved in inducing innate immune response.

    “IRF8, a member of IRF family, is a myeloid lineage transcriptional regulator that plays an essential role in the microglial activation and is involved in inducing innate immune response.”
  • The paper relies on this without support.

    NF-κB-mediated pro-inflammatory gene expression plays an important role in innate immune response against viral infection.

    “NF-κB-mediated pro-inflammatory gene expression plays an important role in innate immune response against viral infection.”
  • The paper relies on this without support.

    CFH is a central regulator of the complement system and viruses can up-regulate CFH expression to inhibit excessive complement activation against them.

    “Complement factor H (CFH) is a central regulator of the complement system and viruses could up-regulate CFH expression to inhibit excessive complement activation against them.”
  • The paper relies on this without support.

    Viruses can utilize CFH to evade the innate immune response.

    “Viruses can utilize CFH to evade the innate immune response.”
  • The paper relies on this without support.

    Intracellular signaling pathways that are concomitantly activated by the same stimulus often interact with one another through a cross regulatory feedback mechanism.

    “Intracellular signaling pathways that are concomitantly activated by the same stimulus often interact with one another through a cross regulatory feedback mechanism.”
  • The paper relies on this without support.

    Following an infection, resting microglial cells can get activated into M1 or M2 phenotypes.

    “Following an infection, resting microglial cells can get activated into M1 or M2 phenotypes.”
  • The paper relies on this without support.

    Very little is known about the role of miR-155 and miR-146a in innate immune modulation during neurotropic flavivirus infection.

    “However, very little is known about their role in innate immune modulation during neurotropic flavivirus infection.”
  • The paper relies on this without support.

    Depending on the expression level, miR-155 can modulate cellular functions by targeting genes in different pathways.

    “Several reports have suggested that, depending on the expression level, miR-155 can modulate cellular functions by targeting genes in different pathways.”
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Metadata

Authors
Pareek, S., Roy, S., Kumari, B., Jain, P., Banerjee, A., & Vrati, S.
Affiliations
Translational Health Science and Technology Institute (IN)
Corresponding author
  • Banerjee, Arup
  • Vrati, Sudhanshu
Venue
Journal of Neuroinflammation
Published
2014-05-29
Volume
11
Issue
1
Pages
97-97
ISSN
1742-2094 (ISSN-L)
OpenAlex
W2138668518
Cited by
121
References
48
Citations by year
2026: 6 · 2025: 4 · 2024: 8 · 2023: 6 · 2022: 11 · 2021: 18 · 2020: 9 · 2019: 6 · 2018: 12 · 2017: 13 · 2016: 14 · 2015: 13 · 2014: 1
FWCI
13.77
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Neuroinflammation (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Department of Biotechnology, Ministry of Science and Technology, India (BT/MB/01/VIDRC/08)
  • National Brain Research Centre
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Mosquito-borne diseases and control
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
miR-155, miR-146a, Japanese encephalitis virus, microglial cells, innate immune response, viral replication, IRF8, complement factor H, NF-κB signaling, STAT1 phosphorylation, CD45, neuroinflammation, antiviral microRNA
MeSH terms
Analysis of Variance, Cell Line, Transformed, Encephalitis Virus, Japanese, Enzyme Inhibitors, Flow Cytometry, Humans, Immunity, Innate, RNA, Messenger, Transfection, Virus Replication, Signal Transduction, Gene Expression Regulation, Viral, Cytokines, NF-kappa B, Complement Factor H, Microglia, MicroRNAs

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