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Calcification of the aortic wall in hypercalcemic rabbits
E Rokita1, T Cichocki, S Divoux
1Institute of Physics, Jagellonian University, Kraków, Poland.
Summary
Vitamin D3-induced hypercalcemia causes aortic wall calcification in rabbits. Mineral deposits evolve from amorphous calcium phosphate to hydroxyapatite, with the Ca/P ratio increasing over time.
Area of Science:
- Biochemistry
- Materials Science
- Pathology
Background:
- Vascular calcification is a pathological process.
- Hypercalcemia is a known risk factor for vascular calcification.
Purpose of the Study:
- To investigate the mineralization process in the aortic wall of hypercalcemic rabbits.
- To characterize the mineral phase composition and its evolution over time.
Main Methods:
- Induction of hypercalcemia using vitamin D3 injection.
- Elemental analysis using proton-induced X-ray emission (PIXE) and atomic absorption spectroscopy.
- Structural analysis using infrared (IR) and X-ray diffraction (XRD) spectroscopy.
- Histochemical examinations of aortic tissue.
Main Results:
- Hypercalcemia induced significant calcification in the aortic wall.
- The mineral phase consisted of calcium-phosphate (Ca-P) salts.
- The Ca/P ratio increased over time, approaching 2 after 246 days.
- Various Ca-P phases were identified, including amorphous calcium phosphate, dicalcium phosphate dihydrate, octacalcium phosphate, and hydroxyapatite.
Conclusions:
- The study elucidated the mechanism of precipitation and growth of inorganic deposits in the aortic wall under hypercalcemic conditions.
- The findings provide insights into the progression of vascular calcification.