[논문]Isolation of calcifiable vesicles from aortas of rabbits fed with high cholesterol diets

doi:10.1016/S0021-9150(00)00425-1

[해외논문] Isolation of calcifiable vesicles from aortas of rabbits fed with high cholesterol diets

Atherosclerosis, v.153 no.2, 2000년, pp.337 - 348

Hsu, Howard H.T (Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS 66160-7410, USA) , Camacho, Nancy P (Research Division, Hospital for Special Surgery, Cornell Medical Center, New York, NY 10021, USA) , Sun, Francis (Laboratory of Animal Resources, University of Kansas Medical Center, Kansas City, KS 66160-7410, USA) , Tawfik, Ossama (Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS 66160-7410, USA) , Aono, H (Department of Anesthesiology, University of Kansas Medical Center, Kansas City, KS 66160-7410, USA)

Abstract ▼ AI-Helper

AbstractAdvanced arterial wall calcification in atherosclerosis imposes a serious rupturing effect on the aorta. However, the mechanism of dystrophic calcification linked to hyperlipidemia, that causes atherosclerosis remains unknown. Emerging morphological and biochemical evidence reveals that calcifiable vesicles may have a role in plaque calcification. To determine whether a high cholesterol diet can induce arterial calcification and produce or activate calcifiable vesicles in aortas, a rabbit model was used. After 2 months of daily high lipid feeding (supplemented with 2% cholesterol and 6% peanut oil), typical atherosclerotic lesions developed. However, the mineral, if present in aortas, was insufficient to be detected by Fourier transform-infrared spectroscopy (FT-IR) or alizarin red staining, indicative of a non-calcifying stage of atherosclerosis. Small segments of thoracic aortas were digested in a crude collagenase solution to release calcifiable vesicles. Vesicles were also isolated from normal aortas as control to consider the possibility that membrane vesicles may be produced by crude collagenase digestion, which could cause the degradation of some cells. Calcifiable vesicles were precipitated at 300 000×g after subcellular particles were removed by centrifugation at 30 000×g. Calcifiability of isolated vesicles was then tested using calcifying media containing physiological levels of Ca2+ and Pi and 1 mM ATP. Electron microscopic observations showed that the isolated vesicles were heterogeneous in size and shape and capable of depositing electron dense particles. Fourier transform infrared spectroscopic analysis of the deposited particles revealed the presence of an amorphous mineral phase. The spectroscopic mineral to matrix ratios, related to the amount of mineralization, indicated that vesicles from cholesterol-fed rabbits produced more minerals than control vesicles obtained from the normal aortas. Alizarin red staining for mineral further demonstrated substantially higher calcifiability of the experimental vesicles. A 3–5 h exposure of the vesicles to calcifying media caused significant deposition of 45Ca and 32Pi in a vesicle protein-concentration dependent manner. Similar to previously reported observations with human atherosclerotic aorta vesicles, rabbit vesicles were enriched in ATP-hydrolyzing enzymes including Mg2+- or Ca2+-ATPase and NTP pyrophosphohydrolase that are implicated in normal and pathological calcification. Altogether, these observations suggest that accumulation of the released calcifiable vesicles, as a result of high cholesterol diets, may have a role in dystrophic calcification in hyperlipidemia-related atherosclerosis.

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