alexa Blocked Ras activation in anergic CD4+ T cells.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Fields PE, Gajewski TF, Fitch FW

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Abstract T cell anergy is a state of functional unresponsiveness characterized by the inability to produce interleukin-2 (IL-2) upon T cell receptor stimulation. The mitogen-activated protein kinases ERK-1 and ERK-2 and the guanosine triphosphate-binding protein p21ras were found to remain unactivated upon stimulation of anergic murine T helper cell 1 clones. The inability to activate the Ras pathway did not result from a defect in association among Shc, Grb-2, and murine Son of Sevenless, nor from a defect in their tyrosine phosphorylation. This block in Ras activation may lead to defective transactivation at activator protein 1 sites in anergic cells and may enable T cells to shut down IL-2 production selectively during anergy.
This article was published in Science and referenced in Journal of Clinical & Cellular Immunology

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