Regulation and function of p21(ras) in T lymphocytes

M. I. Pastor, M. Woodrow, D. Cantrell

Research output: Contribution to journalReview articlepeer-review

20 Citations (Scopus)


T cell activation is triggered by antigen stimulation and is characterized by the production of a wide range of cytokines and other immunomodulators crucial for the growth and development of other haemopoietic cells. Activation also induces the T cells to express, on their cell surface, receptors that enable the T cell to respond to the various cytokines generated during an immune response. One well characterized event that occurs when mature T cells are activated is the production of the cytokine IL2 and the acquisition by the T cell of IL2 receptors. Interaction between IL2 and its cellular receptor then directs T cell growth. Expression of the IL2 gene in T cells is regulated by signalling pathways that originate from the T cell antigen receptor complex (TCR). This review discusses the role of p21(ras) in these events. The TCR regulates the activity of p21(ras), and a range of experiments have shown that p21(ras) couples the TCR to an intracellular kinase cascade involving the serine/threonine kinase Raf-1 and the MAP kinase ERK2. Analysis of more distal receptor signals shows that p21(ras) controls a signalling pathway that cooperates with a calcium/calcineurin controlled signalling system to stimulate the transcriptional factor NFAT and hence the IL2 gene. These studies identify p21(ras) as a critical signalling molecule in immune cells.

Original languageEnglish
Pages (from-to)75-83
Number of pages9
JournalCancer Surveys
Publication statusPublished - 1994


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