IFITM Proteins That Restrict the Early Stages of Respiratory Virus Infection Do Not Influence Late-Stage Replication

Interferon-induced transmembrane (IFITM) proteins inhibit a broad range of enveloped viruses by blocking entry into host cells. We used an inducible overexpression system to investigate if IFITM1, IFITM2, and IFITM3 could modulate early and/or late stages of influenza A virus (IAV) or parainfluenza...

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Published inJournal of virology Vol. 95; no. 20; p. e0083721
Main Authors Meischel, Tina, Fritzlar, Svenja, Villalon-Letelier, Fernando, Tessema, Melkamu B, Brooks, Andrew G, Reading, Patrick C, Londrigan, Sarah L
Format Journal Article
LanguageEnglish
Published United States American Society for Microbiology 27.09.2021
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Abstract Interferon-induced transmembrane (IFITM) proteins inhibit a broad range of enveloped viruses by blocking entry into host cells. We used an inducible overexpression system to investigate if IFITM1, IFITM2, and IFITM3 could modulate early and/or late stages of influenza A virus (IAV) or parainfluenza virus 3 (PIV-3) infection in human A549 airway epithelial cells. IAV and PIV-3 represent respiratory viruses which utilize distinct cellular entry pathways. We verify entry by endocytosis for IAV, whereas PIV-3 infection was consistent with fusion at the plasma membrane. Following induction prior to infection, all three IFITM proteins restricted the percentage of IAV-infected cells at 8 hours postinfection. In contrast, prior induction of IFITM1 and IFITM2 did not inhibit PIV-3 infection, although a modest reduction was observed with IFITM3. Small interfering RNA (siRNA)-mediated knockdown of endogenous IFITM1, IFITM2, and IFITM3 expression, in the presence or absence of pretreatment with type I interferon, resulted in increased IAV, but not PIV-3, infection. This finding suggests that while all three IFITMs display antiviral activity against IAV, they do not restrict the early stages of PIV-3 infection. IAV and PIV-3 infection culminates in viral egress through budding at the plasma membrane. Inducible expression of IFITM1, IFITM2, or IFITM3 immediately after infection did not impact titers of infectious virus released from IAV- or PIV-3-infected cells. Our findings show that IFITM proteins differentially restrict the early stages of infection of two respiratory viruses with distinct cellular entry pathways but do not influence the late stages of replication for either virus. Interferon-induced transmembrane (IFITM) proteins restrict the initial stages of infection for several respiratory viruses; however, their potential to modulate the later stages of virus replication has not been explored. In this study, we highlight the utility of an inducible overexpression system to assess the impact of IFITM proteins on either early- or late-stage replication of two respiratory viruses. We demonstrate antiviral activity by IFITM1, IFITM2, and IFITM3 against influenza A virus (IAV) but not parainfluenza virus 3 (PIV-3) during the early stages of cellular infection. Furthermore, IFITM induction following IAV or PIV-3 infection does not restrict the late stages of replication of either virus. Our findings show that IFITM proteins can differentially restrict the early stages of infection of two viruses with distinct cellular entry pathways and yet do not influence the late stages of replication for either virus.
AbstractList Interferon-induced transmembrane (IFITM) proteins inhibit a broad range of enveloped viruses by blocking entry into host cells. We used an inducible overexpression system to investigate if IFITM1, IFITM2, and IFITM3 could modulate early and/or late stages of influenza A virus (IAV) or parainfluenza virus 3 (PIV-3) infection in human A549 airway epithelial cells. IAV and PIV-3 represent respiratory viruses which utilize distinct cellular entry pathways. We verify entry by endocytosis for IAV, whereas PIV-3 infection was consistent with fusion at the plasma membrane. Following induction prior to infection, all three IFITM proteins restricted the percentage of IAV-infected cells at 8 hours postinfection. In contrast, prior induction of IFITM1 and IFITM2 did not inhibit PIV-3 infection, although a modest reduction was observed with IFITM3. Small interfering RNA (siRNA)-mediated knockdown of endogenous IFITM1, IFITM2, and IFITM3 expression, in the presence or absence of pretreatment with type I interferon, resulted in increased IAV, but not PIV-3, infection. This finding suggests that while all three IFITMs display antiviral activity against IAV, they do not restrict the early stages of PIV-3 infection. IAV and PIV-3 infection culminates in viral egress through budding at the plasma membrane. Inducible expression of IFITM1, IFITM2, or IFITM3 immediately after infection did not impact titers of infectious virus released from IAV- or PIV-3-infected cells. Our findings show that IFITM proteins differentially restrict the early stages of infection of two respiratory viruses with distinct cellular entry pathways but do not influence the late stages of replication for either virus. IMPORTANCE Interferon-induced transmembrane (IFITM) proteins restrict the initial stages of infection for several respiratory viruses; however, their potential to modulate the later stages of virus replication has not been explored. In this study, we highlight the utility of an inducible overexpression system to assess the impact of IFITM proteins on either early- or late-stage replication of two respiratory viruses. We demonstrate antiviral activity by IFITM1, IFITM2, and IFITM3 against influenza A virus (IAV) but not parainfluenza virus 3 (PIV-3) during the early stages of cellular infection. Furthermore, IFITM induction following IAV or PIV-3 infection does not restrict the late stages of replication of either virus. Our findings show that IFITM proteins can differentially restrict the early stages of infection of two viruses with distinct cellular entry pathways and yet do not influence the late stages of replication for either virus.
Interferon-induced transmembrane (IFITM) proteins inhibit a broad range of enveloped viruses by blocking entry into host cells. We used an inducible overexpression system to investigate if IFITM1, IFITM2, and IFITM3 could modulate early and/or late stages of influenza A virus (IAV) or parainfluenza virus 3 (PIV-3) infection in human A549 airway epithelial cells. IAV and PIV-3 represent respiratory viruses which utilize distinct cellular entry pathways. We verify entry by endocytosis for IAV, whereas PIV-3 infection was consistent with fusion at the plasma membrane. Following induction prior to infection, all three IFITM proteins restricted the percentage of IAV-infected cells at 8 hours postinfection. In contrast, prior induction of IFITM1 and IFITM2 did not inhibit PIV-3 infection, although a modest reduction was observed with IFITM3. Small interfering RNA (siRNA)-mediated knockdown of endogenous IFITM1, IFITM2, and IFITM3 expression, in the presence or absence of pretreatment with type I interferon, resulted in increased IAV, but not PIV-3, infection. This finding suggests that while all three IFITMs display antiviral activity against IAV, they do not restrict the early stages of PIV-3 infection. IAV and PIV-3 infection culminates in viral egress through budding at the plasma membrane. Inducible expression of IFITM1, IFITM2, or IFITM3 immediately after infection did not impact titers of infectious virus released from IAV- or PIV-3-infected cells. Our findings show that IFITM proteins differentially restrict the early stages of infection of two respiratory viruses with distinct cellular entry pathways but do not influence the late stages of replication for either virus. IMPORTANCE Interferon-induced transmembrane (IFITM) proteins restrict the initial stages of infection for several respiratory viruses; however, their potential to modulate the later stages of virus replication has not been explored. In this study, we highlight the utility of an inducible overexpression system to assess the impact of IFITM proteins on either early- or late-stage replication of two respiratory viruses. We demonstrate antiviral activity by IFITM1, IFITM2, and IFITM3 against influenza A virus (IAV) but not parainfluenza virus 3 (PIV-3) during the early stages of cellular infection. Furthermore, IFITM induction following IAV or PIV-3 infection does not restrict the late stages of replication of either virus. Our findings show that IFITM proteins can differentially restrict the early stages of infection of two viruses with distinct cellular entry pathways and yet do not influence the late stages of replication for either virus.
Interferon-induced transmembrane (IFITM) proteins inhibit a broad range of enveloped viruses by blocking entry into host cells. We used an inducible overexpression system to investigate if IFITM1, IFITM2, and IFITM3 could modulate early and/or late stages of influenza A virus (IAV) or parainfluenza virus 3 (PIV-3) infection in human A549 airway epithelial cells. IAV and PIV-3 represent respiratory viruses which utilize distinct cellular entry pathways. We verify entry by endocytosis for IAV, whereas PIV-3 infection was consistent with fusion at the plasma membrane. Following induction prior to infection, all three IFITM proteins restricted the percentage of IAV-infected cells at 8 hours postinfection. In contrast, prior induction of IFITM1 and IFITM2 did not inhibit PIV-3 infection, although a modest reduction was observed with IFITM3. Small interfering RNA (siRNA)-mediated knockdown of endogenous IFITM1, IFITM2, and IFITM3 expression, in the presence or absence of pretreatment with type I interferon, resulted in increased IAV, but not PIV-3, infection. This finding suggests that while all three IFITMs display antiviral activity against IAV, they do not restrict the early stages of PIV-3 infection. IAV and PIV-3 infection culminates in viral egress through budding at the plasma membrane. Inducible expression of IFITM1, IFITM2, or IFITM3 immediately after infection did not impact titers of infectious virus released from IAV- or PIV-3-infected cells. Our findings show that IFITM proteins differentially restrict the early stages of infection of two respiratory viruses with distinct cellular entry pathways but do not influence the late stages of replication for either virus. Interferon-induced transmembrane (IFITM) proteins restrict the initial stages of infection for several respiratory viruses; however, their potential to modulate the later stages of virus replication has not been explored. In this study, we highlight the utility of an inducible overexpression system to assess the impact of IFITM proteins on either early- or late-stage replication of two respiratory viruses. We demonstrate antiviral activity by IFITM1, IFITM2, and IFITM3 against influenza A virus (IAV) but not parainfluenza virus 3 (PIV-3) during the early stages of cellular infection. Furthermore, IFITM induction following IAV or PIV-3 infection does not restrict the late stages of replication of either virus. Our findings show that IFITM proteins can differentially restrict the early stages of infection of two viruses with distinct cellular entry pathways and yet do not influence the late stages of replication for either virus.
Interferon-induced transmembrane (IFITM) proteins restrict the initial stages of infection for several respiratory viruses; however, their potential to modulate the later stages of virus replication has not been explored. In this study, we highlight the utility of an inducible overexpression system to assess the impact of IFITM proteins on either early- or late-stage replication of two respiratory viruses. Interferon-induced transmembrane (IFITM) proteins inhibit a broad range of enveloped viruses by blocking entry into host cells. We used an inducible overexpression system to investigate if IFITM1, IFITM2, and IFITM3 could modulate early and/or late stages of influenza A virus (IAV) or parainfluenza virus 3 (PIV-3) infection in human A549 airway epithelial cells. IAV and PIV-3 represent respiratory viruses which utilize distinct cellular entry pathways. We verify entry by endocytosis for IAV, whereas PIV-3 infection was consistent with fusion at the plasma membrane. Following induction prior to infection, all three IFITM proteins restricted the percentage of IAV-infected cells at 8 hours postinfection. In contrast, prior induction of IFITM1 and IFITM2 did not inhibit PIV-3 infection, although a modest reduction was observed with IFITM3. Small interfering RNA (siRNA)-mediated knockdown of endogenous IFITM1, IFITM2, and IFITM3 expression, in the presence or absence of pretreatment with type I interferon, resulted in increased IAV, but not PIV-3, infection. This finding suggests that while all three IFITMs display antiviral activity against IAV, they do not restrict the early stages of PIV-3 infection. IAV and PIV-3 infection culminates in viral egress through budding at the plasma membrane. Inducible expression of IFITM1, IFITM2, or IFITM3 immediately after infection did not impact titers of infectious virus released from IAV- or PIV-3-infected cells. Our findings show that IFITM proteins differentially restrict the early stages of infection of two respiratory viruses with distinct cellular entry pathways but do not influence the late stages of replication for either virus. IMPORTANCE Interferon-induced transmembrane (IFITM) proteins restrict the initial stages of infection for several respiratory viruses; however, their potential to modulate the later stages of virus replication has not been explored. In this study, we highlight the utility of an inducible overexpression system to assess the impact of IFITM proteins on either early- or late-stage replication of two respiratory viruses. We demonstrate antiviral activity by IFITM1, IFITM2, and IFITM3 against influenza A virus (IAV) but not parainfluenza virus 3 (PIV-3) during the early stages of cellular infection. Furthermore, IFITM induction following IAV or PIV-3 infection does not restrict the late stages of replication of either virus. Our findings show that IFITM proteins can differentially restrict the early stages of infection of two viruses with distinct cellular entry pathways and yet do not influence the late stages of replication for either virus.
Author Meischel, Tina
Tessema, Melkamu B
Brooks, Andrew G
Fritzlar, Svenja
Villalon-Letelier, Fernando
Londrigan, Sarah L
Reading, Patrick C
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Keywords IFITM
influenza
host restriction factors
parainfluenza virus
Language English
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Tina Meischel and Svenja Fritzlar contributed equally to the manuscript. Author order was determined in order of increasing seniority.
Citation Meischel T, Fritzlar S, Villalon-Letelier F, Tessema MB, Brooks AG, Reading PC, Londrigan SL. 2021. IFITM proteins that restrict the early stages of respiratory virus infection do not influence late-stage replication. J Virol 95:e00837-21. https://doi.org/10.1128/JVI.00837-21.
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Snippet Interferon-induced transmembrane (IFITM) proteins inhibit a broad range of enveloped viruses by blocking entry into host cells. We used an inducible...
Interferon-induced transmembrane (IFITM) proteins restrict the initial stages of infection for several respiratory viruses; however, their potential to...
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SubjectTerms A549 Cells
Antigens, Differentiation - metabolism
Cell Line, Tumor
Cell Membrane - metabolism
Endocytosis - physiology
Host-Pathogen Interactions - physiology
Humans
Influenza A virus - metabolism
Influenza A virus - pathogenicity
Interferons - metabolism
Membrane Proteins - metabolism
Parainfluenza Virus 3, Human - metabolism
Parainfluenza Virus 3, Human - pathogenicity
RNA-Binding Proteins - metabolism
Virology
Virus Diseases - metabolism
Virus Internalization
Virus Replication - physiology
Virus-Cell Interactions
Title IFITM Proteins That Restrict the Early Stages of Respiratory Virus Infection Do Not Influence Late-Stage Replication
URI https://www.ncbi.nlm.nih.gov/pubmed/34319159
https://journals.asm.org/doi/10.1128/JVI.00837-21
https://search.proquest.com/docview/2555972475
https://pubmed.ncbi.nlm.nih.gov/PMC8475524
Volume 95
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