Platelet-derived growth factor (PDGF) induces pulmonary vascular remodeling through 15-LO/15-HETE pathway under hypoxic condition.

Abstract

15-lipoxygenase (15-LO) is known to play an important role in chronic pulmonary hypertension. Accumulating evidence for its down-stream participants in the vasoconstriction and remodeling processes of pulmonary arteries, while how hypoxia regulates 15-LO/15-hydroxyeicosatetraenoic acid (15-HETE) to mediate hypoxic pulmonary hypertension is still unknown. Platelet-derived growth factor (PDGF) is an important vascular regulator whose concentration increases under hypoxic condition in the lungs of both humans and mice with pulmonary hypertension. The present study was carried out to determine whether hypoxia advances the pulmonary vascular remodeling through the PDGF/15-LO/15-HETE pathway. We found that pulmonary arterial medial thickening caused by hypoxia was alleviated after a treatment of the hypoxic rats with imatinib, which was associated with down-regulations of 15-LO-2 expression and 15-HETE production. Moreover, the increases in cell proliferation and endogenous 15-HETE content by hypoxia were attenuated by the inhibitors of PDGF-β receptor in pulmonary artery smooth muscle cells (PASMCs). The effects of PDGF-BB on cell proliferation and survival were weakened after the administration of 15-LO inhibitors or 15-LO RNA interference. These results suggest that hypoxia promotes PASMCs proliferation and survival, contributing to pulmonary vascular medial hypertrophy, which is likely to be mediated via the PDGF-BB/15-LO-2/15-HETE pathway.

• Authors: Lei Zhang, Jun Ma, Tingting Shen, Shuang Wang, Cui Ma, Yun Liu, Yajuan Ran, Lin Wang, Lijuan Liu, Daling Zhu
• Journal: Cellular signalling (Cell Signal) Vol. 24 Issue 10 Pg. 1931-9 (Oct 2012) ISSN: 1873-3913 [Electronic] England
• PMID: 22735810 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Crown Copyright © 2012. Published by Elsevier Inc. All rights reserved.

Chemical References

• Cell Cycle Proteins
• Hydroxyeicosatetraenoic Acids
• Platelet-Derived Growth Factor
• Proto-Oncogene Proteins c-sis
• platelet-derived growth factor A
• Becaplermin
• 15-hydroxy-5,8,11,13-eicosatetraenoic acid
• Arachidonate 15-Lipoxygenase

Topics

• Animals
• Arachidonate 15-Lipoxygenase (genetics, metabolism)
• Becaplermin
• Cell Cycle
• Cell Cycle Proteins (metabolism)
• Cell Proliferation
• Cells, Cultured
• Hydroxyeicosatetraenoic Acids (metabolism)
• Hypoxia (genetics, metabolism, pathology)
• Lung (blood supply)
• Male
• Myocytes, Smooth Muscle (cytology, metabolism, pathology)
• Platelet-Derived Growth Factor (metabolism)
• Proto-Oncogene Proteins c-sis (metabolism)
• Pulmonary Artery (cytology, metabolism, pathology)
• Rats
• Rats, Wistar
• Signal Transduction
• Up-Regulation