Abstract
Signal transduction through both cytokine and lymphocyte antigen receptors shares some common pathways by which they initiate cellular responses, such as activation of mitogen-activated protein kinase(s). However, other signalling components appear to be uniquely coupled to each receptor. For example, the interferon receptors transduce regulatory signals through the JAK/STAT pathway, resulting in an inhibition of growth and of antiviral effects, whereas this pathway apparently plays no role in T-cell-receptor (TCR)-dependent gene expression. Conversely, signal transduction through the TCR requires the tyrosine kinases Lck and ZAP-70 and the tyrosine phosphatase CD45. Here we show that, unexpectedly, transmission of growth-inhibitory signals by interferon-alpha (IFN-alpha) in T cells requires the expression and association of CD45, Lck and ZAP-70 with the IFN-alpha-receptor signalling complex.
MeSH terms
-
Animals
-
Chlorocebus aethiops
-
DNA-Binding Proteins / metabolism
-
Growth Inhibitors / metabolism
-
Growth Inhibitors / physiology*
-
Humans
-
In Vitro Techniques
-
Interferon-alpha / metabolism
-
Interferon-alpha / physiology*
-
Jurkat Cells
-
Leukocyte Common Antigens / metabolism
-
Lymphocyte Specific Protein Tyrosine Kinase p56(lck) / metabolism
-
Measles virus / drug effects
-
Measles virus / physiology
-
Protein-Tyrosine Kinases / metabolism
-
Receptor, Interferon alpha-beta
-
Receptors, Antigen, T-Cell / metabolism*
-
Receptors, Interferon / metabolism
-
STAT1 Transcription Factor
-
STAT2 Transcription Factor
-
Signal Transduction*
-
Trans-Activators / metabolism
-
Vero Cells
-
Virus Replication / drug effects
-
ZAP-70 Protein-Tyrosine Kinase
Substances
-
DNA-Binding Proteins
-
Growth Inhibitors
-
Interferon-alpha
-
Receptors, Antigen, T-Cell
-
Receptors, Interferon
-
STAT1 Transcription Factor
-
STAT1 protein, human
-
STAT2 Transcription Factor
-
Trans-Activators
-
Receptor, Interferon alpha-beta
-
Protein-Tyrosine Kinases
-
Lymphocyte Specific Protein Tyrosine Kinase p56(lck)
-
ZAP-70 Protein-Tyrosine Kinase
-
ZAP70 protein, human
-
Leukocyte Common Antigens