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The Hepcidin/Ferroportin axis modulates proliferation of pulmonary artery smooth muscle cells
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The Hepcidin/Ferroportin axis modulates proliferation of pulmonary artery smooth muscle cells
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Journal Article
The Hepcidin/Ferroportin axis modulates proliferation of pulmonary artery smooth muscle cells
2018
Overview
Studies were undertaken to examine any role for the hepcidin/ferroportin axis in proliferative responses of human pulmonary artery smooth muscle cells (hPASMCs). Entirely novel findings have demonstrated the presence of ferroportin in hPASMCs. Hepcidin treatment caused increased proliferation of these cells most likely by binding ferroportin resulting in internalisation and cellular iron retention. Cellular iron content increased with hepcidin treatment. Stabilisation of ferroportin expression and activity via intervention with the therapeutic monoclonal antibody LY2928057 reversed proliferation and cellular iron accumulation. Additionally, IL-6 treatment was found to enhance proliferation and iron accumulation in hPASMCs; intervention with LY2928057 prevented this response. IL-6 was also found to increase hepcidin transcription and release from hPASMCs suggesting a potential autocrine response. Hepcidin or IL-6 mediated iron accumulation contributes to proliferation in hPASMCs; ferroportin mediated cellular iron excretion limits proliferation. Haemoglobin also caused proliferation of hPASMCs; in other novel findings, CD163, the haemoglobin/haptoglobin receptor, was found on these cells and offers a means for cellular uptake of iron via haemoglobin. Il-6 was also found to modulate CD163 on these cells. These data contribute to a better understanding of how disrupted iron homeostasis may induce vascular remodelling, such as in pulmonary arterial hypertension.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 13/106
/ 13/21
/ 13/51
/ 14/19
/ 692/4019
/ Antibodies, Monoclonal - pharmacology
/ Antigens, Differentiation, Myelomonocytic - metabolism
/ Autocrine Communication - drug effects
/ Autocrine Communication - physiology
/ Cation Transport Proteins - biosynthesis
/ Gene Expression Regulation - drug effects
/ Gene Expression Regulation - physiology
/ Hepcidin
/ Humanities and Social Sciences
/ Humans
/ Iron
/ Muscle, Smooth, Vascular - cytology
/ Muscle, Smooth, Vascular - metabolism
/ Myocytes, Smooth Muscle - cytology
/ Myocytes, Smooth Muscle - metabolism
/ Pulmonary Artery - metabolism
/ Receptors, Cell Surface - metabolism
/ Science
