Betts, Michael R.

Buggert, Marcus

Deeks, Steven G.

Frederiksen, Juliet

Hecht, Frederick Mm

Karlsson, Annika C.

Ljunggren, Hans-Gustaf

Lund, Ole

Naji, Ali

Reyes-Terán, Gustavo

Scharf, Lydia

Sönnerborg, Anders

Tauriainen, Johanna

HIV-specific CD8+ T cells demonstrate an exhausted phenotype associated with increased expression of inhibitory receptors, decreased functional capacity, and a skewed transcriptional profile, which are only partially restored by antiretroviral treatment (ART). Expression levels of the inhibitory receptor, T cell immunoglobulin and ITIM domain (TIGIT), the co-stimulatory receptor CD226 and their ligand PVR are altered in viral infections and cancer. However, the extent to which the TIGIT/CD226/PVR-axis is affected by HIV-infection has not been characterized. Here, we report that TIGIT expression increased over time despite early initiation of ART. HIV-specific CD8+ T cells were almost exclusively TIGIT+, had an inverse expression of the transcription factors T-bet and Eomes and co-expressed PD-1, CD160 and 2B4. HIV-specific TIGIThi cells were negatively correlated with polyfunctionality and displayed a diminished expression of CD226. Furthermore, expression of PVR was increased on CD4+ T cells, especially T follicular helper (Tfh) cells, in HIV-infected lymph nodes. These results depict a skewing of the TIGIT/CD226 axis from CD226 co-stimulation towards TIGIT-mediated inhibition of CD8+ T cells, despite early ART. These findings highlight the importance of the TIGIT/CD226/PVR axis as an immune checkpoint barrier that could hinder future "cure" strategies requiring potent HIV-specific CD8+ T cells

Online Research Database In Technology

Perturbed CD8<sup>+</sup> T cell TIGIT/CD226/PVR axis despite early initiation of antiretroviral treatment in HIV infected individuals

http://orbit.dtu.dk/ws/files/128478088/Perturbed_CD8.pdf

Perturbed CD8<sup>+</sup> T cell TIGIT/CD226/PVR axis despite early initiation of antiretroviral treatment in HIV infected individuals

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Online Research Database In Technology