PURPOSE: The peripheral tolerance that arises after injection of antigen into the anterior chamber (anterior chamber-associated immune deviation; ACAID) is associated in part with CD8+ T cells that suppress the expression of Th1 and Th2 immunity. The purpose of these studies was to determine the genes and molecules that are critical for CD8+ T regulatory cell (T reg) functions in ACAID. METHODS: Ovalbumin (OVA)-specific CD8+ T cells from T-cell receptor (TCR) transgenic OT-1 mice acquire efferent regulatory properties similar to in vivo-generated CD8+ T regs after stimulation with OVA-pulsed TGF-beta2-treated APCs. Changes in the genetic program associated with acquisition of efferent regulatory function in OT-1 CD8+ T cells in vitro were determined by DNA microarray analyses and confirmed by RT-PCR analyses and biological assays. RESULTS: T regulatory OT-1 T cells acquired a novel transcriptional pattern indicative of their function. Genes for molecules associated with TGF-beta function, resistance to TCR-triggered apoptosis, and localization of cells to antigen deposition in peripheral tissues were upregulated, and genes related to cytolytic function were downregulated. Further study showed that CD103, a cell-adhesion molecule that binds E-cadherin, was highly upregulated in in vivo-generated ACAID T regs and was necessary for their suppression of T-cell activation in vitro. CONCLUSIONS: OT-1 CD8 T cells modulated in vitro by exposure to antigen-pulsed, TGF-beta2-treated APCs expressed genes related to immune suppression. Thus, the necessity for CD103 emerges in the efferent CD8+ T-cell regulatory mechanisms in eye-derived tolerance.
PURPOSE: The peripheral tolerance that arises after injection of antigen into the anterior chamber (anterior chamber-associated immune deviation; ACAID) is associated in part with CD8+ T cells that suppress the expression of Th1 and Th2 immunity. The purpose of these studies was to determine the genes and molecules that are critical for CD8+ T regulatory cell (T reg) functions in ACAID. METHODS:Ovalbumin (OVA)-specific CD8+ T cells from T-cell receptor (TCR) transgenic OT-1 mice acquire efferent regulatory properties similar to in vivo-generated CD8+ T regs after stimulation with OVA-pulsed TGF-beta2-treated APCs. Changes in the genetic program associated with acquisition of efferent regulatory function in OT-1 CD8+ T cells in vitro were determined by DNA microarray analyses and confirmed by RT-PCR analyses and biological assays. RESULTS: T regulatory OT-1 T cells acquired a novel transcriptional pattern indicative of their function. Genes for molecules associated with TGF-beta function, resistance to TCR-triggered apoptosis, and localization of cells to antigen deposition in peripheral tissues were upregulated, and genes related to cytolytic function were downregulated. Further study showed that CD103, a cell-adhesion molecule that binds E-cadherin, was highly upregulated in in vivo-generated ACAID T regs and was necessary for their suppression of T-cell activation in vitro. CONCLUSIONS: OT-1 CD8 T cells modulated in vitro by exposure to antigen-pulsed, TGF-beta2-treated APCs expressed genes related to immune suppression. Thus, the necessity for CD103 emerges in the efferent CD8+ T-cell regulatory mechanisms in eye-derived tolerance.
Authors: Galina Gabriely; Andre P da Cunha; Rafael M Rezende; Brendan Kenyon; Asaf Madi; Tyler Vandeventer; Nathaniel Skillin; Stephen Rubino; Lucien Garo; Maria A Mazzola; Panagiota Kolypetri; Amanda J Lanser; Thais Moreira; Ana Maria C Faria; Hans Lassmann; Vijay Kuchroo; Gopal Murugaiyan; Howard L Weiner Journal: Sci Immunol Date: 2017-05-19
Authors: B M Pratheek; Tapas K Nayak; Subhransu S Sahoo; Prafulla K Mohanty; Soma Chattopadhyay; Ntiya G Chakraborty; Subhasis Chattopadhyay Journal: Indian J Hum Genet Date: 2014-04