Abstract
Aims
Macrocalcification and microcalcification present different clinical risks, but the regulatory of their formation was unclear. Therefore, this study explored the underlying mechanisms of macrocalcification and microcalcification in diabetes mellitus.
Methods
Anterior tibial arteries of amputated diabetic feet were collected. According to the calcium content, patients were divided into less-calcification group and more-calcification group. And calcification morphology in plaques was observed. For further study, an in vivo mouse diabetic atherosclerosis model and an in vitro primary mouse aortic smooth muscle cell model were established. After the receptors for AGEs (RAGE) or galectin-3 were silenced, calcified nodule sizes and sortilin expression were determined. Scanning electron microscopy (SEM) was performed to detect the aggregation of matrix vesicles with the inhibition or promotion of sortilin.
Results
Both macro- and microcalcification were found in human anterior tibial artery plaques. Macrocalcification formed after the silencing of RAGE, and microcalcification formed after the silencing of galectin-3. In the process of RAGE- or galcetin-3-induced calcification, sortilin played an important role downstream. SEM showed that sortilin promoted the aggregation of MVs in the early stage of calcification and formed larger calcified nodules.
Conclusion
RAGE downregulated sortilin and then transmitted microcalcification signals, whereas galectin-3 upregulated sortilin, which accelerated the aggregation of MVs in the early stage of calcification and mediated the formation of macrocalcifications, These data illustrate the progression of two calcification types and suggest sortilin as a potential target for early intervention of calcification and as an effective biomarker for the assessment of long-term clinical risk and prognosis.
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Data availability
All data and materials are available upon request.
Abbreviations
- VSMCs:
-
Vascular smooth muscle cells
- CML:
-
Nε-carboxymethyl-lysine
- AGEs:
-
Advanced glycation end products
- RAGE:
-
Receptor for advanced glycation end products
- GWAS:
-
Genome-wide association study
- SPF:
-
Specific pathogen free
- STZ:
-
Streptozotocin
- AAV:
-
Adeno-associated viral
- OM:
-
Osteogenic medium
- LV:
-
Lentivirus vector
- oxLDL:
-
Oxidized low-density lipoprotein
- CoIP:
-
Coimmunoprecipitation
- SEM:
-
Scanning electron microscopy
- NTA:
-
Nanoparticle tracking analysis
- MVs:
-
Matrix vesicles
- HFD:
-
High-fat diet
- RUNX2:
-
Runt-related transcription factor 2
- PBS:
-
Phosphate-buffered saline
- TNAP:
-
Tissue nonspecific alkaline phosphatase
- EVs:
-
Extracellular vesicles
- CCK-8:
-
Cell counting kit-8
- MOI:
-
Multiplicity of infection
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Funding
This work was supported by the foundations as follows: the National Natural Science Foundation of China (Grant Nos. 81770450, 81370408, 81670405), the Foundation of Jiangsu Province (WSN-044, QNRC2016836), the Open Program of Key Laboratory of Nuclear Medicine, Ministry of Health and Jiangsu Key Laboratory of Molecular Nuclear Medicine (KF201504) and Graduate Student Scientific Research Innovation Projects of Jiangsu Province (KYCX17_1801, SJCX18_0754).
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ZS performed, and analyzed experiments, produced figures, and wrote the manuscript. LL contributed to section preparation and immunofluorescence analysis. JY helped the in vivo and in vitro models establishment. CS contributed to gene silencing of cells and mice. ZB helped with SEM and data analysis. LJ contributed to MVs isolation and NTA. YG helped with clinical data collection and analysis. PQ and LZ provided suggestions for experimental design. ZW designed and supervised experiments and wrote the manuscript. All authors read and approved the final manuscript.
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Human studies conform to the principles outlined in the Declaration of Helsinki (1964) and was approved by the Ethical Committee of the Affiliated Hospital of Jiangsu University. All animal experiments were approved by the Animal Health and Utilization Committee of the Affiliated Hospital of Jiangsu University, and carried out in accordance with the guidelines from Directive 2010/63/EU and “Principles of laboratory animal care” (NIH publication No. 86-23, revised 1985).
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Sun, Z., Wang, Z., Li, L. et al. RAGE/galectin-3 yields intraplaque calcification transformation via sortilin. Acta Diabetol 56, 457–472 (2019). https://doi.org/10.1007/s00592-018-1273-1
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DOI: https://doi.org/10.1007/s00592-018-1273-1