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Lung inflammation stalls Th17-cell migration en route to the central nervous system during the development of experimental autoimmune encephalomyelitis

Kanayama, M;Danzaki, K;He, YW;Shinohara, ML;

Recruiting pathogenic T cells to the central nervous system (CNS) is a critical step during the development of experimental autoimmune encephalomyelitis (EAE). Here, we report that the absence of autophagy and microtubule-associated protein 1A/1B-light chain 3-associated phagocytosis significantly delayed the onset of EAE inAtg7conditional knockout (Atg7CKO) mice in myeloid cells. T-helper cell-cell priming appeared to be normal in theAtg7CKO mice, but the mice showed significant accumulation of Th17 cells in the lung. The data suggested that the stalling of Th17 cells in the lungen routeto the CNS caused the delay. The lung ofAtg7CKO mice, in which we previously demonstrated spontaneous mild inflammation, showed high expression of CCL20, a chemokine that attracts Th17 cells. We have also shown that LPS intranasal instillation delayed EAE onset, suggesting that pulmonary inflammation has an impact on EAE development. Based on our data, therapeutic immunomodulation targeted to the lung, rather than systemically, might be a possible future option to treat multiple sclerosis.