Abstract
The present study compares the mitogen-activated protein (MAP) kinase responses in T cells activated with the CD28 ligands B7-1 (CD80) and B7-2/B70 (CD86). Ligands B7-1 and B7-2 do not activate the Raf-1/ERK2 cascade, but share the ability to activate related Jun kinases. These natural ligands for CD28 had no stimulatory effect alone on Jun kinase activation, but the data show that B7-1 and B7-2 could both co-operate with intracellular Ca2+ increase and protein kinase C (PKC) activation to stimulate Jun kinases. The present study shows that the interaction of CD28 with its ligands B7-1 and B7-2 can induce identical signal transduction through the MAP kinase cascades.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Antigens, CD / physiology*
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B7-1 Antigen / physiology*
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B7-2 Antigen
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CD28 Antigens / physiology*
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Calcium-Calmodulin-Dependent Protein Kinases / metabolism*
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Cell Line
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Humans
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JNK Mitogen-Activated Protein Kinases
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Lymphocyte Activation
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Membrane Glycoproteins / physiology*
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Mitogen-Activated Protein Kinase 1
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Mitogen-Activated Protein Kinases*
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Phosphotyrosine / metabolism
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Protein Serine-Threonine Kinases / metabolism
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Proto-Oncogene Proteins / metabolism
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Proto-Oncogene Proteins c-jun / metabolism
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Proto-Oncogene Proteins c-raf
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Signal Transduction
Substances
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Antigens, CD
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B7-1 Antigen
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B7-2 Antigen
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CD28 Antigens
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CD86 protein, human
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Membrane Glycoproteins
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Proto-Oncogene Proteins
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Proto-Oncogene Proteins c-jun
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Phosphotyrosine
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Protein Serine-Threonine Kinases
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Proto-Oncogene Proteins c-raf
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Calcium-Calmodulin-Dependent Protein Kinases
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JNK Mitogen-Activated Protein Kinases
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Mitogen-Activated Protein Kinase 1
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Mitogen-Activated Protein Kinases