Membrane vesicles released by intestinal epithelial cells infected with rotavirus inhibit T-cell function

Area of Science:

• Immunology
• Virology
• Cell Biology

Background:

• Rotavirus (RV) infects intestinal epithelial cells (IECs), releasing
• danger signals
• that influence viral immunity.
• Previous work showed RV-infected Caco-2 cells release immunomodulators like heat shock proteins (HSPs) and TGF-β1.

Purpose of the Study:

• To investigate the role of membrane vesicles (MVs) in releasing immunomodulators during RV infection.
• To determine if MVs from RV-infected cells affect T cell function.

Main Methods:

• Caco-2 cells were infected with RV, and released MVs were isolated via ultracentrifugation.
• MV characterization included exosome markers (CD63) and protein analysis (VP6, TGF-β1).
• T cell proliferation and death assays were performed using MVs from infected and non-infected cells.

Main Results:

• RV-infected cells released MVs containing viral protein VP6 and TGF-β1.
• MVs from RV-infected cells significantly inhibited CD4(+) T cell proliferation and induced cell death.
• These inhibitory effects were partially reversed by TGF-β receptor inhibition.

Conclusions:

• RV infection leads to the release of MVs from intestinal cells.
• These MVs carry viral components and contribute to T cell suppression.
• MVs released during RV infection play a role in modulating the host immune response.