Signals involved in thymocyte positive and negative selection.
Extensive research has focused upon understanding how thymocytes distinguish between interactions that lead to positive or negative selection. Various intracellular pathways that are activated after TCR engagement are outlined in this review, and their contribution to thymocyte selection is discussed. Although thymocyte fate is generally governed by a quantitative/avidity model, this largely reflects the interactions that occur at the cell surface. Therefore, we outline possible models of how different intercellular interactions are translated into intracellular signals that diverge and lead to thymocyte survival or death.
Mariathasan
S
S
Departments of Medical Biophysics and Immunology, Ontario Cancer Institute, 610 University Avenue, Toronto, Ontario, M5G 2M9, Canada.
Jones
R G
RG
Ohashi
P S
PS
D000818:Animals; D016923:Cell Death; D002454:Cell Differentiation / Q000276:immunology*; D002470:Cell Survival; D006801:Humans; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000502:physiology; D015398:Signal Transduction / Q000276:immunology*; D013601:T-Lymphocytes / Q000166:cytology* / Q000276:immunology
D016693:Receptors, Antigen, T-Cell, alpha-beta