Elicitation of T-cell responses by structural and non-structural proteins of coxsackievirus B4

Area of Science:

• Virology
• Immunology
• Molecular Biology

Background:

• Coxsackievirus B4 (CV-B4) is an enterovirus implicated in various human diseases.
• Understanding T-cell recognition of viral proteins is crucial for developing effective immune strategies against enterovirus infections.

Purpose of the Study:

• To identify specific CV-B4 viral proteins recognized by T-cells in healthy adults.
• To characterize T-cell responses to both structural and non-structural CV-B4 proteins.

Main Methods:

• Expression and purification of CV-B4 structural (VP0, VP1, VP3) and non-structural (2A, 2B, 2C, 3C, 3D) proteins using Escherichia coli.
• Generation of enterovirus-specific T-cell lines from peripheral blood of 19 healthy donors.
• Assessment of T-cell responses to purified viral proteins and CV-B4 cell lysate antigen.

Main Results:

• T-cell lines exhibited diverse individual response patterns to CV-B4 proteins.
• The structural VP0 protein (VP4 and VP2) was the most frequently recognized, with T-cell responses detected in 79% of donor lines.
• Non-structural proteins 2C and 3D were also significantly recognized (58% of lines each), along with other non-structural proteins (2A, 2B, 3C).
• T-cell responses did not correlate with HLA-DR-DQ phenotype or prior coxsackie B virus infection history.

Conclusions:

• CV-B4 infection elicits T-cell responses targeting multiple viral proteins, with VP0 being a major immunodominant antigen.
• Non-structural proteins like 2C and 3D also contribute to the T-cell mediated immune response.
• These findings provide insights into the T-cell epitope landscape of CV-B4, relevant for vaccine development and understanding viral pathogenesis.