Integrin Alpha E (CD103) Limits Virus-Induced IFN-I Production in Conventional Dendritic Cells

Area of Science:

• Immunology
• Virology
• Cell Biology

Background:

• Early production of Interferon-I (IFN-I) by dendritic cells is crucial for controlling vesicular stomatitis virus (VSV).
• Mechanisms underlying cell-type-specific innate immune activation in response to VSV are not fully understood.

Purpose of the Study:

• To identify novel regulators of antiviral IFN-I production in dendritic cells.
• To elucidate the role of Integrin alpha-E (CD103) in the innate immune response to VSV.

Main Methods:

• Genome-wide association study (GWAS) in a mouse model of VSV infection.
• Analysis of CD103 expression in splenic conventional dendritic cells (cDCs).
• Investigation of signaling pathways, including AKT phosphorylation and mTOR activation, in DCs.

Main Results:

• Integrin alpha-E (CD103) was identified as a regulator of IFN-I production in cDCs.
• CD103 expression on cDCs limited IFN-I production during VSV infection.
• CD103 deficiency led to accelerated early IFN-I production and improved survival in VSV-infected mice.
• CD103 was found to suppress AKT phosphorylation and mTOR activation in DCs.

Conclusions:

• CD103 plays a significant role in regulating cDC-specific IFN-I induction.
• CD103 acts as a negative regulator of the innate immune response to VSV.
• Targeting CD103 may represent a therapeutic strategy to enhance antiviral immunity.