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- Title
CD49d marks Th1 and Tfh-like antigen-specific CD4<sup>+</sup> T cells during Plasmodium chabaudi infection.
- Authors
Jian, Jiun-Yu; Inoue, Shin-Ichi; Bayarsaikhan, Ganchimeg; Miyakoda, Mana; Kimura, Daisuke; Kimura, Kazumi; Nozaki, Eriko; Sakurai, Takuya; Fernandez-Ruiz, Daniel; Heath, William R; Yui, Katsuyuki
- Abstract
Upon activation, specific CD4+ T cells up-regulate the expression of CD11a and CD49d, surrogate markers of pathogen-specific CD4+ T cells. However, using T-cell receptor transgenic mice specific for a Plasmodium antigen, termed PbT-II, we found that activated CD4+ T cells develop not only to CD11ahiCD49dhi cells, but also to CD11ahiCD49dlo cells during acute Plasmodium infection. CD49dhi PbT-II cells, localized in the red pulp of spleens, expressed transcription factor T-bet and produced IFN-γ, indicating that they were type 1 helper T (Th1)-type cells. In contrast, CD49dlo PbT-II cells resided in the white pulp/marginal zones and were a heterogeneous population, with approximately half of them expressing CXCR5 and a third expressing Bcl-6, a master regulator of follicular helper T (Tfh) cells. In adoptive transfer experiments, both CD49dhi and CD49dlo PbT-II cells differentiated into CD49dhi Th1-type cells after stimulation with antigen-pulsed dendritic cells, while CD49dhi and CD49dlo phenotypes were generally maintained in mice infected with Plasmodium chabaudi. These results suggest that CD49d is expressed on Th1-type Plasmodium -specific CD4+ T cells, which are localized in the red pulp of the spleen, and can be used as a marker of antigen-specific Th1 CD4+ T cells, rather than that of all pathogen-specific CD4+ T cells.
- Subjects
T cells; PLASMODIUM; SPLEEN; BIOMARKERS; TRANSGENIC mice
- Publication
International Immunology, 2021, Vol 33, Issue 8, p409
- ISSN
0953-8178
- Publication type
Article
- DOI
10.1093/intimm/dxab020