Antigen presentation

De Jong and colleagues identify staphylococcal phosphatidylglycerol lipids as antigens for human CD1a-restricted T cells, which promote type 2 immune responses and may contribute to atopic dermatitis.

Sixt and colleagues show that different fibroblast populations in the lymph node mechanically control its swelling in a multitier fashion.

A comparison of the repertoire of SARS-CoV-2-specific epitopes targeted by T cells induced by vaccination or natural infection reveals that T cells predominantly target non-spike epitopes in convalescent individuals, while there is a broader spike-specific CD8⁺ T-cell response in vaccinees. Despite differences in T-cell response, the targeted T-cell epitopes were conserved between the wild-type and Omicron variants in both groups.

Immune responses to pancreatic ductal adenocarcinoma can be inhibited by cancer cells. Here the authors show that high levels of progranulin in PDAC inhibits immune responses by reducing MHC class I antigen presentation through enhanced degradation of MHC class I via autophagy.