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Mitochondrial regulation of cell cycle progression through SLC25A43
School of Health and Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
School of Health and Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden; Department of Oncology, Linköping University, Linköping, Sweden.
Örebro University, School of Medicine, Örebro University, Sweden. Department of Clinical Research Laboratory.
2016 (English)In: Biochemical and Biophysical Research Communications - BBRC, ISSN 0006-291X, E-ISSN 1090-2104, Vol. 469, no 4, 1090-1096 p.Article in journal (Refereed) Published
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Text
Abstract [en]

An increasing body of evidence is pointing towards mitochondrial regulation of the cell cycle. In a previous study of HER2-positive tumours we could demonstrate a common loss in the gene encoding for the mitochondrial transporter SLC25A43 and also a significant relation between SLC25A43 protein expression and S-phase fraction. Here, we investigated the consequence of suppressed SLC25A43 expression on cell cycle progression and proliferation in breast epithelial cells.

In the present study, we suppressed SLC25A43 using siRNA in immortalised non-cancerous breast epithelial MCF10A cells and HER2-positive breast cancer cells BT-474. Viability, apoptosis, cell proliferation rate, cell cycle phase distribution, and nuclear Ki-67 and p21, were assessed by flow cytometry. Cell cycle related gene expressions were analysed using real-time PCR.

We found that SLC25A43 knockdown in MCF10A cells significantly inhibited cell cycle progression during G(1)-to-S transition, thus significantly reducing the proliferation rate and fraction of Ki-67 positive MCF10A cells. In contrast, suppressed SLC25A43 expression in BT-474 cells resulted in a significantly increased proliferation rate together with an enhanced G(1)-to-S transition. This was reflected by an increased fraction of Ki-67 positive cells and reduced level of nuclear p21. In line with our previous results, we show a role for SLC25A43 as a regulator of cell cycle progression and proliferation through a putative mitochondrial checkpoint. These novel data further strengthen the connection between mitochondrial function and the cell cycle, both in non-malignant and in cancer cells. (C) 2015 Elsevier Inc. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 469, no 4, 1090-1096 p.
Keyword [en]
SLC25A43, Mitochondrial checkpoint, Proliferation, Cell cycle regulation, Ki-67
National Category
Medical Biotechnology
Research subject
Molecular Biology
Identifiers
URN: urn:nbn:se:oru:diva-48760DOI: 10.1016/j.bbrc.2015.12.088ISI: 000369353000046PubMedID: 26721434Scopus ID: 2-s2.0-84957824627OAI: oai:DiVA.org:oru-48760DiVA: diva2:907592
Funder
Swedish Research Council, K2011-54X-20639-04-6
Note

Funding Agencies:

Lion Cancer Foundation Sweden

Research Committee at Örebro County Council

Available from: 2016-02-29 Created: 2016-02-29 Last updated: 2017-10-17Bibliographically approved

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