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The signal transduction pathways of heat shock protein 27 phosphorylation in vascular smooth muscle cells

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Abstract

The objective of this study is to investigate the signal transduction pathways that regulate heat shock protein 27 (HSP27) phosphorylation and migration of vascular smooth muscle cells (VSMCs) from spontaneously hypertensive rats (SHR) induced by angiotensin II (AngII) and platelet derived growth factor-BB (PDGF-BB). The activity of HSP27 was evaluated by Western blot with specific phospho-HSP27 antibody. F-actin polymerization was detected by FITC-Phalloidine staining using confocal microscopy. Modified Boyden chamber technique was employed for VSMCs migration assessment. Within a given concentration, the phosphorylation of HSP27 induced by AngII and PDGF-BB was blocked by the specific P38MAPK inhibitor SB202190, the specific PI3K inhibitor LY294002 and the specific ERK1/2 inhibitor U0126 in a concentration-dependent manner, with a peak inhibition rate at 87.2%, 78.4% and 37.3%, respectively, induced by AngII (P < 0.01), with a peak inhibition rate at 85.0%, 55.3% and 41.0%, respectively, induced by PDGF-BB (P < 0.01).The migration of VSMCs induced by AngII and PDGF-BB was inhibited by 100 μmol/l SB202190, 30 μmol/l LY294002, and 30 μmol/l U0126, with a inhibition rate at 60.1%, 71.7% and 47.3%, respectively, provoked by AngII (P < 0.01), with a inhibition rate at 55.3%, 55.6% and 38.1%, respectively, provoked by PDGF-BB (P < 0.01). P38MAPK and PI3 K/Akt are important pathways that contribute to the phosphorylation of HSP27 and migration of VSMCs in response to AngII and PDGF-BB. ERK1/2 might be involved in HSP27 phosphorylation and migration of VSMCs provoked by AngII and PDGF-BB.

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Acknowledgment

This work was supported by grant from Key Subjects Development Fund from Fujian Medical University (FJGXY04003).

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Authors and Affiliations

  1. Fujian Hypertension Research Institute, First Affiliated Hospital, Fujian Medical University, 350005, Fuzhou, China

    Hai-Feng Chen, Liang-Di Xie & Chang-Sheng Xu

  2. Department of Cardiology, Fujian Provincial Clinical College, Fujian Medical University, 350001, Fuzhou, China

    Hai-Feng Chen

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  1. Hai-Feng Chen
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  2. Liang-Di Xie
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  3. Chang-Sheng Xu
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Correspondence to Hai-Feng Chen or Liang-Di Xie.

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Chen, HF., Xie, LD. & Xu, CS. The signal transduction pathways of heat shock protein 27 phosphorylation in vascular smooth muscle cells. Mol Cell Biochem 333, 49–56 (2010). https://doi.org/10.1007/s11010-009-0203-5

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  • DOI: https://doi.org/10.1007/s11010-009-0203-5

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