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CD4⁺ T-cell responses to herpes simplex virus type 2 (HSV-2) glycoprotein G are type specific and differ in symptomatic and asymptomatic HSV-2-infected individuals

Kristina Eriksson^1,

Lars Bellner^1,

¹ Department of Rheumatology & Inflammation Research, Göteborg University, Guldhedsgatan 10A, 413 46 Göteborg, Sweden
² Department of Virology, Göteborg University, Guldhedsgatan 10A, 413 46 Göteborg, Sweden
³ Department of Dermatovenereology, Göteborg University, Guldhedsgatan 10A, 413 46 Göteborg, Sweden
⁴ Department of Dermatology, Uddevalla Hospital, Uddevalla, Sweden

Correspondence
Kristina Eriksson
kristina.eriksson{at}microbio.gu.se

T-cell recognition of the secreted and membrane-bound portions of the herpes simplex virus type 2 (HSV-2) glycoprotein G (sgG-2 and mgG-2, respectively) was compared in symptomatic and asymptomatic HSV-2-infected individuals and in HSV-2-seronegative controls and the responses with HSV-1 glycoproteins C and E (gC-1 and gE-1) were compared. CD4⁺ T cells from HSV-2-infected individuals specifically recognized both sgG-2 and mgG-2, whereas HSV-1-infected and HSV-seronegative controls did not respond to these glycoproteins. The responses to gC-1 and gE-1, on the other hand, were not type specific, as blood mononuclear cells from both HSV-1- and HSV-2-infected individuals responded in vitro. There was an association between the status of the infection (symptomatic versus asymptomatic) and the CD4⁺ T-cell responsiveness. Symptomatic HSV-2-seropositive individuals responded with significantly lower Th1 cytokine production to sgG-2 and mgG-2 than did asymptomatic HSV-2-infected carriers, especially within the HSV-1-negative cohort. No differences in T-cell proliferation were observed between asymptomatic and symptomatic individuals. The results have implications for studies of HSV-2-specific CD4⁺ T-cell reactivity in general and for analysis of immunological differences between asymptomatic and symptomatic individuals in particular.

These authors contributed equally to this work.

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