Th1, Th17, and Th9 effector cells induce experimental autoimmune encephalomyelitis with different pathological...

Area of Science:

• Neuroimmunology
• Autoimmunity
• T cell subsets

Background:

• Experimental autoimmune encephalomyelitis (EAE) serves as a model for human multiple sclerosis.
• Autoreactive T helper (Th) cells, including Th1 and Th17 subsets, are implicated in EAE pathogenesis.
• The encephalitogenic potential of Th17 cells remains debated, and the role of the newly identified Th9 subset in EAE is unexplored.

Purpose of the Study:

• To investigate and compare the encephalitogenic potential of distinct T cell subsets specific for myelin antigens.
• To characterize the pathological phenotypes induced by different effector T cell subsets in EAE.

Main Methods:

• Development of in vitro protocols to generate myelin oligodendrocyte glycoprotein (MOG)-specific Th1, Th2, Th9, and Th17 cells.
• Adoptive transfer of these generated T cell subsets into recipient animals to induce EAE.
• Comparative analysis of disease induction and pathological features.

Main Results:

• Myelin oligodendrocyte glycoprotein (MOG)-specific Th1, Th17, and Th9 cells, but not Th2 cells, were found to induce EAE upon adoptive transfer.
• Each encephalitogenic T cell subset induced a distinct pathological phenotype.
• These findings highlight the differential contributions of various effector T cell subsets to CNS autoimmunity.

Conclusions:

• Multiple distinct effector T cell subsets targeting myelin antigens can initiate CNS autoimmunity.
• The pathological heterogeneity observed in multiple sclerosis lesions may be partly attributed to the action of different myelin-reactive effector T cells.
• This study clarifies the roles of Th1, Th17, and Th9 cells in EAE induction and suggests a broader spectrum of T cell involvement in demyelinating diseases.