Abstract
Arterial media calcification is related to mitochondrial dysfunction. Protective mitophagy delays the progression of vascular calcification. We previously reported that lactate accelerates osteoblastic phenotype transition of VSMC through BNIP3-mediated mitophagy suppression. In this study, we investigated the specific links between lactate, mitochondrial homeostasis, and vascular calcification. Ex vivo, alizarin S red and von Kossa staining in addition to measurement of calcium content, RUNX2, and BMP-2 protein levels revealed that lactate accelerated arterial media calcification. We demonstrated that lactate induced mitochondrial fission and apoptosis in aortas, whereas mitophagy was suppressed. In VSMCs, lactate increased NR4A1 expression, leading to activation of DNA-PKcs and p53. Lactate induced Drp1 migration to the mitochondria and enhanced mitochondrial fission through NR4A1. Western blot analysis of LC3-II and p62 and mRFP-GFP-LC3 adenovirus detection showed that NR4A1 knockdown was involved in enhanced autophagy flux. Furthermore, NR4A1 inhibited BNIP3-related mitophagy, which was confirmed by TOMM20 and BNIP3 protein levels, and LC3-II co-localization with TOMM20. The excessive fission and deficient mitophagy damaged mitochondrial structure and impaired respiratory function, determined by mPTP opening rate, mitochondrial membrane potential, mitochondrial morphology under TEM, ATP production, and OCR, which was reversed by NR4A1 silencing. Mechanistically, lactate enhanced fission but halted mitophagy via activation of the NR4A1/DNA-PKcs/p53 pathway, evoking apoptosis, finally accelerating osteoblastic phenotype transition of VSMC and calcium deposition. This study suggests that the NR4A1/DNA-PKcs/p53 pathway is involved in the mechanism by which lactate accelerates vascular calcification, partly through excessive Drp-mediated mitochondrial fission and BNIP3-related mitophagy deficiency.
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Abbreviations
- VSMC:
-
Vascular smooth muscle cell
- BNIP3:
-
BCL2/adenovirus E1B 19 kDa protein-interacting protein 3
- RUNX2:
-
Runt-related transcription factor 2
- BMP-2:
-
Bone morphogenetic protein 2
- NR4A1:
-
Nuclear receptor subfamily 4 group A member 1
- DNA-PKcs:
-
DNA-dependent protein kinase, catalytic subunit
- Drp1:
-
Dynamin-related protein 1
- LC3-II:
-
Microtubule-associated protein 1 light chain 3B
- p62:
-
SQSTM1
- TOMM20:
-
Translocase of outer mitochondrial membrane 20
- mPTP:
-
Mitochondrial permeability transition pore
- TEM:
-
Transmission electron microscope
- ATP:
-
Adenosine triphosphate
- OCR:
-
Oxygen consumption rate
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Acknowledgements
This work was supported by the National Nature Science Foundation of China (No. 81770451), the Fundamental Research Funds for the Central Universities and Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX19_0117), and the Jiangsu Provincial Health and Wellness Committee Research Project (No. H2018001).
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YZ was involved in the experimental design, biochemistry detection, data analysis, and writing of the manuscript. WQM, XQH, SXJ, and YR contributed to the animal model construction and cell culture. NFL was the supervisor and provided expertise in experimental design.
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Zhu, Y., Han, XQ., Sun, XJ. et al. Lactate accelerates vascular calcification through NR4A1-regulated mitochondrial fission and BNIP3-related mitophagy. Apoptosis 25, 321–340 (2020). https://doi.org/10.1007/s10495-020-01592-7
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DOI: https://doi.org/10.1007/s10495-020-01592-7