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Nury T, Sghaier R, Zarrouk A, Ménétrier F, Uzun T, Leoni V, Caccia C, Meddeb W, Namsi A, Sassi K, Mihoubi W, Riedinger JM, Cherkaoui-Malki M, Moreau T, Vejux A, Lizard G. Induction of peroxisomal changes in oligodendrocytes treated with 7-ketocholesterol: Attenuation by α-tocopherol. Biochimie 2018; 153:181-202. [PMID: 30031877 DOI: 10.1016/j.biochi.2018.07.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 07/17/2018] [Indexed: 02/08/2023]
Abstract
The involvement of organelles in cell death is well established especially for endoplasmic reticulum, lysosomes and mitochondria. However, the role of the peroxisome is not well known, though peroxisomal dysfunction favors a rupture of redox equilibrium. To study the role of peroxisomes in cell death, 158 N murine oligodendrocytes were treated with 7-ketocholesterol (7 KC: 25-50 μM, 24 h). The highest concentration is known to induce oxiapoptophagy (OXIdative stress + APOPTOsis + autoPHAGY), whereas the lowest concentration does not induce cell death. In those conditions (with 7 KC: 50 μM) morphological, topographical and functional peroxisome alterations associated with modifications of the cytoplasmic distribution of mitochondria, with mitochondrial dysfunction (loss of transmembrane mitochondrial potential, decreased level of cardiolipins) and oxidative stress were observed: presence of peroxisomes with abnormal sizes and shapes similar to those observed in Zellweger fibroblasts, lower cellular level of ABCD3, used as a marker of peroxisomal mass, measured by flow cytometry, lower mRNA and protein levels (measured by RT-qPCR and western blotting) of ABCD1 and ABCD3 (two ATP-dependent peroxisomal transporters), and of ACOX1 and MFP2 enzymes, and lower mRNA level of DHAPAT, involved in peroxisomal β-oxidation and plasmalogen synthesis, respectively, and increased levels of very long chain fatty acids (VLCFA: C24:0, C24:1, C26:0 and C26:1, quantified by gas chromatography coupled with mass spectrometry) metabolized by peroxisomal β-oxidation. In the presence of 7 KC (25 μM), slight mitochondrial dysfunction and oxidative stress were found, and no induction of apoptosis was detected; however, modifications of the cytoplasmic distribution of mitochondria and clusters of mitochondria were detected. The peroxisomal alterations observed with 7 KC (25 μM) were similar to those with 7 KC (50 μM). In addition, data obtained by transmission electron microcopy and immunofluorescence microscopy by dual staining with antibodies raised against p62, involved in autophagy, and ABCD3, support that 7 KC (25-50 μM) induces pexophagy. 7 KC (25-50 μM)-induced side effects were attenuated by α-tocopherol but not by α-tocotrienol, whereas the anti-oxidant properties of these molecules determined with the FRAP assay were in the same range. These data provide evidences that 7 KC, at concentrations inducing or not cell death, triggers morphological, topographical and functional peroxisomal alterations associated with minor or major mitochondrial changes.
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Affiliation(s)
- Thomas Nury
- Univ. Bourgogne Franche-Comté, Lab. Bio-PeroxIL, 'Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism' (EA7270) / Inserm, Dijon, France
| | - Randa Sghaier
- Univ. Bourgogne Franche-Comté, Lab. Bio-PeroxIL, 'Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism' (EA7270) / Inserm, Dijon, France; Univ. Monastir, Lab. Biotechnology, Monastir, Tunisia
| | - Amira Zarrouk
- Univ. Monastir, Lab-NAFS 'Nutrition - Functional Food & Vascular Diseases' LR12-ES-05, Monastir, Tunisia; Faculty of Medicine, Sousse, Tunisia
| | | | - Tugba Uzun
- Univ. Bourgogne Franche-Comté, Lab. Bio-PeroxIL, 'Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism' (EA7270) / Inserm, Dijon, France
| | - Valerio Leoni
- Lab. Clinical Chemistry, Hospital of Varese, ASST-Settelaghi, Varese, Italy
| | - Claudio Caccia
- Unit of Medical Genetics and Neurogenetics, IRCCS Carlo Besta, Milano, Italy
| | - Wiem Meddeb
- Univ. Carthage, LMMA, IPEST, Tunis, and Fac. of Science of Bizerte, Bizerte, Tunisia
| | - Amira Namsi
- Univ. Bourgogne Franche-Comté, Lab. Bio-PeroxIL, 'Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism' (EA7270) / Inserm, Dijon, France; Univ. Tunis El Manar, Lab. Neurophysiologie Fonctionnelle et Pathologie-UR11ES/09, Tunis, Tunisia
| | - Khouloud Sassi
- Univ. Bourgogne Franche-Comté, Lab. Bio-PeroxIL, 'Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism' (EA7270) / Inserm, Dijon, France; Univ. Tunis El Manar, Fac. of Medicine, Lab of Onco-Hematology, Tunis, Tunisia
| | - Wafa Mihoubi
- Centre de Biotechnologie de Sfax, Lab. Biotechnologie Moléculaire des Eucaryotes, Sfax, Tunisia
| | - Jean-Marc Riedinger
- Centre de Lutte Contre le Cancer GF Leclerc, Laboratoire de Biologie Médicale, Dijon, France
| | - Mustapha Cherkaoui-Malki
- Univ. Bourgogne Franche-Comté, Lab. Bio-PeroxIL, 'Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism' (EA7270) / Inserm, Dijon, France
| | - Thibault Moreau
- Univ. Bourgogne Franche-Comté, Lab. Bio-PeroxIL, 'Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism' (EA7270) / Inserm, Dijon, France; Dept. of Neurology, Univ. Hospital of Dijon, France
| | - Anne Vejux
- Univ. Bourgogne Franche-Comté, Lab. Bio-PeroxIL, 'Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism' (EA7270) / Inserm, Dijon, France
| | - Gérard Lizard
- Univ. Bourgogne Franche-Comté, Lab. Bio-PeroxIL, 'Biochemistry of the Peroxisome, Inflammation and Lipid Metabolism' (EA7270) / Inserm, Dijon, France.
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