Publication: The phosphorylation of phospholipase C-gamma1, Raf-1, MEK, and ERK1/2 induced by a conserved retroviral peptide
Issued Date
2005-11-01
Resource Type
ISSN
01969781
Other identifier(s)
2-s2.0-27744537286
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Peptides. Vol.26, No.11 (2005), 2165-2174
Suggested Citation
Tian Xue Fan, Noorbibi K. Day, Voravich Luangwedchakarn, Yenhui Chang, Susumu Ikehara, Danica L. Lerner, Soichi Haraguchi The phosphorylation of phospholipase C-gamma1, Raf-1, MEK, and ERK1/2 induced by a conserved retroviral peptide. Peptides. Vol.26, No.11 (2005), 2165-2174. doi:10.1016/j.peptides.2005.04.009 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/16282
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
The phosphorylation of phospholipase C-gamma1, Raf-1, MEK, and ERK1/2 induced by a conserved retroviral peptide
Other Contributor(s)
Abstract
A synthetic 17-amino acid peptide (CKS-17) homologous to a highly conserved region of human and animal retroviral transmembrane proteins has been found to exhibit suppressive properties for numerous immune functions. It has been shown that CKS-17 causes an imbalance of human types 1 and 2 cytokines and inhibition of the immune responses of lymphocytes, monocytes, and macrophages. CKS-17 induced increased intracellular levels of cAMP, which plays an important role in regulation of cytokine biosynthesis. In this study, using a Jurkat T-cell line and Western blot analysis, CKS-17 induced phosphorylation of PLC-gamma1, Raf-1, MEK and ERK1/2. Using a PLC selective inhibitor U73122 or PLC-gamma1-deficient Jurkat cell line, phosphorylation induced by CKS-17 of ERK1/2, PLC-gamma1, or Raf-1, respectively, were undetectable or significantly reduced. Reintroduction of PLC-gamma1 into the PLC-gamma1-deficient Jurkat cells restored the phosphorylation of ERK1/2 and PLC-gamma1 induced by CKS-17. Further, pretreatment of Jurkat cells with PKC inhibitors blocks the phosphorylation of Raf-1, MEK, and ERK1/2 induced by CKS-17. These results indicate that CKS-17 induces the PLC-gamma1-PKC-Raf-1-MEK-ERK1/2 signaling pathway. © 2005 Elsevier Inc. All rights reserved.