Gangliosides in T cell development and function of mice.

The molecular diversity of glycosphingolipids (GSLs) that arouse during the course of evolution clearly plays an essential role in maintenance of biological homeostasis. Why is such a wide variety of GSLs necessary, and what gave rise to the expression mechanisms that are selective and specific to individual cells, tissues, or organs? What is the biological significance of these mechanisms? The same questions apply to GSLs involved in T cell development and activation. Primary CD4 T cells and CD8 T cells preferentially express differing ganglioside series: a-series and o-series, respectively. Conversely, a-series and o-series ganglioside deficiency results respectively in CD4 and CD8 T cell dysfunction. Dynamic changes in ganglioside expression occur during T cell development in thymus. Ganglioside GM3 synthase deficiency, which results in lack of a-series gangliosides, ameliorated CD4 T cell-mediated airway hypersensitivity in a mouse model of allergic asthma. In this review, we summarize findings from these and many studies to illustrate the key roles of gangliosides in T cell differentiation and function.