Beta-VLDL induced VLDL-R's up-regulation via PKC-ERK1/2 signal pathway

To explore the intracellular signal pathways for beta-VLDL induced very low density lipoprotein receptor (VLDL-R) transcription up-regulation and their effects on lipid accumulation in macrophages, Western Blot was used to examine phosphorylated ERK1/2 protein and regulated effects by different sing...

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Bibliographic Details
Published in:Journal of Huazhong University of Science and Technology. Medical sciences 2004, Vol.24 (4), p.314-317
Main Authors: Liu, Zhiguo, Wang, Yan, Qu, Shen, Feng, Youmei, Wu, Fan, Zong, Yiqiang, Zhao, Zechun
Format: Article
Language:English
Subjects:
Cells, Cultured
Lipoproteins, VLDL - metabolism
Macrophages - cytology
Macrophages - metabolism
Mitogen-Activated Protein Kinase 1 - metabolism
Mitogen-Activated Protein Kinase 1 - physiology
Mitogen-Activated Protein Kinase 3 - metabolism
Mitogen-Activated Protein Kinase 3 - physiology
Protein Kinase C - antagonists & inhibitors
Protein Kinase C - metabolism
Receptors, LDL - biosynthesis
Receptors, LDL - genetics
Signal Transduction
Transcription Factors - metabolism
Transcription, Genetic
Up-Regulation
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Summary:To explore the intracellular signal pathways for beta-VLDL induced very low density lipoprotein receptor (VLDL-R) transcription up-regulation and their effects on lipid accumulation in macrophages, Western Blot was used to examine phosphorylated ERK1/2 protein and regulated effects by different singal kinase inhibitants. It was found that beta-VLDL induced an increase in ERK1/2 activity in a protein kinase C (PKC)-dependent manner in murine RAW264.7 macrophages. By using different protein kinases inhibitors or activators, it was observed that the effect of beta-VLDL induced VLDL receptor transcription, which was monitored by RT-PCR analysis of VLDL receptor mRNA, was not affected by the inhibitor of p38 kinase and cAMP analog, but extremely abolished by pretreating cells with PD98059, an inhibitor of ERK and GF 109203X, an inhibitor of PKC. These results demonstrated that the PKC-ERK1/2 cascade is the essential signaling pathway by which beta-VLDL activated VLDL-R mRNA expression. Inhibition of the ERK1/2 signaling cascade resulted in suppression of the cellular lipid accumulation induced by beta-VLDL in macrophages.
ISSN:1672-0733
1993-1352
DOI:10.1007/BF02861856