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Different mitochondrial fragmentation after irradiation with X-rays and carbon ions in HeLa cells and its influence on cellular apoptosis
- Source :
- Biochemical and biophysical research communications. 500(4)
- Publication Year :
- 2018
-
Abstract
- Although mitochondria are known to play an important role in radiation-induced cellular damage, the mechanisms by which ionizing radiation modulates mitochondrial dynamics are largely unknown. In this study, human cervical carcinoma cell line HeLa was used to demonstrate the different modes of mitochondrial network in response to different quality radiations such as low linear energy transfer (LET) X-rays and high-LET carbon ions. Mitochondria fragmented into punctate and clustered ones upon carbon ion irradiation in a dose- and LET-dependent manner, which was associated with apoptotic cell death. In contrast, low-dose X-ray irradiation promoted mitochondrial fusion while mitochondrial fission was detected until the radiation dose was more than 1 Gy. This fission was driven by ERK1/2-mediated phosphorylation of Drp1 on Serine 616. Inhibition of mitochondrial fragmentation suppressed the radiation-induced apoptosis and thus enhanced the resistance of cells to carbon ions and high-dose X-rays, but not for cells irradiated with X-rays at the low dose. Our results suggest that radiations of different qualities cause diverse changes of mitochondrial dynamics in cancer cells, which play an important role in determining the cell fate.
- Subjects :
- 0301 basic medicine
Dynamins
Biophysics
Apoptosis
Mitochondrion
Biochemistry
Mitochondrial Dynamics
Radiation Tolerance
Ionizing radiation
GTP Phosphohydrolases
HeLa
Mitochondrial Proteins
03 medical and health sciences
Humans
Linear Energy Transfer
Molecular Biology
Protein Kinase Inhibitors
Mitogen-Activated Protein Kinase 1
Mitogen-Activated Protein Kinase 3
biology
Chemistry
X-Rays
Diphenylamine
Dose-Response Relationship, Radiation
Cell Biology
biology.organism_classification
Carbon
Cell biology
Mitochondria
Gene Expression Regulation, Neoplastic
030104 developmental biology
mitochondrial fusion
Cell culture
Cancer cell
Benzamides
Mitochondrial fission
Microtubule-Associated Proteins
HeLa Cells
Signal Transduction
Subjects
Details
- ISSN :
- 10902104
- Volume :
- 500
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Biochemical and biophysical research communications
- Accession number :
- edsair.doi.dedup.....b0a61d2fb666becd30520a7c98bb9aa0