Abstract
Background: Recently, trimethylamine N-oxide was introduced as a risk factor for atherosclerosis in terms of helping foam cell formation and worsening atherosclerosis complications. The present study was performed to investigate whether/how trimethylamine N-oxide is involved in regulation of ATP-binding cassette transporter A1 and scavenger receptor A1 in macrophages at both mRNA and protein levels. Methods: Murine macrophage J774A.1 cells were treated with micromolar concentrations of trimethylamine N-oxide and 4-phenylbutyric acid, a chemical chaperon, for different time intervals. Tunicamycin was also used as a control for induction of endoplasmic reticulum stress. Results: Similar to tunicamycin, trimethylamine N-oxide increased scavenger receptor A1 in all treatment periods, whereas ATP-binding cassette transporter A1 was only reduced 24 h post-treatment with trimethylamine N-oxide at both mRNA and protein levels. In contrast, 4-phenylbutyric acid failed to induce such changes in either scavenger receptor A1 or ATP-binding cassette transporter A1. Conclusions: The results of this study, in agreement with previous studies, confirm the mechanistic role of trimethylamine N-oxide in the upregulation of scavenger receptor A1, which potentially can promote its proatherogenic role. The results also showed downregulation of ATP-binding cassette transporter A1 in trimethylamine N-oxide treated macrophages which may indicate another possible proatherosclerotic mechanism for foam cell formation.
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Acknowledgments
This work was supported financially by vice chancellor in research of Kerman University of Medical Sciences. We also thank the heads of the Department of Physiology and the Leishmaniasis Research Center of Afzalipour School of Medicine, Kerman University of Medical Sciences for their valuable assistance.
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This study is funded by vice chancellor in research of Kerman University of Medical Sciences.
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The authors have no conflicts of interest.
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Abbas Mohammadi carried out the design and supervised the study, and participated in manuscript preparation. Ahmad Gholamhoseynian Najar provided assistance in the design of the study, coordinated in manuscript preparation. Mohammad Mehdi Yaghoobi provided assistance in the design of primers and real time PCR experiments and participated in manuscript preparation. Yunes Jahani assisted in the statistical analysis of the study. Zakaria Vahabzadeh carried out all the experiments and prepared the manuscript. All authors have read and approved the content of the manuscript.
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Mohammadi, A., Najar, A.G., Yaghoobi, M.M. et al. Trimethylamine-N-Oxide Treatment Induces Changes in the ATP-Binding Cassette Transporter A1 and Scavenger Receptor A1 in Murine Macrophage J774A.1 cells. Inflammation 39, 393–404 (2016). https://doi.org/10.1007/s10753-015-0261-7
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DOI: https://doi.org/10.1007/s10753-015-0261-7