Journal List > J Nutr Health > v.49(1) > 1081476

Shin and Kwun: Role of zinc for calcification inhibitor protein in vascular smooth muscle cell plaque formation

Abstract

Purpose

Zinc, a biomineral present within and outside cells, manages various cellular mechanisms. In this study, we examined whether zinc was involved in vascular smooth muscle cell (VSMC) calcification via regulation of calcification inhibitor protein, osteopontin (OPN).

Methods

Rat aorta cell line (A7r5 cells) and primary vascular smooth muscle cells (pVSMCs) from rat aorta were cultured with phosphate (1-5 mM) and zinc (0-15 µM) as appropriate, along with osteoblasts (MC3T3-E1) as control. The cells were then stained for Ca and P deposition for calcification examination as well as osteopontin expression as calcification inhibitor protein was measured.

Results

Both Ca and phosphate deposition increased as the addition of phosphate increased. In the same manner, the expression of osteopontin was upregulated as the addition of phosphate increased in both cell types. When zinc was added, Ca and P deposition decreased in VSMCs, while it increased in osteoblasts.

Conclusion

The results imply that zinc may prevent VSMC calcification by stimulating calcification inhibitor protein OPN synthesis in VSMCs.

Figures and Tables

Fig. 1

The addition of phosphate induced Ca (A) and P (B) deposition in vascular smooth muscle cells (pVSMCs and A7r5 cells) as well as in osteoblasts (MC3T3-E1 cells). Cells were cultured with the designated phosphate levels for 12 days and stained for Ca (A, in red) and P (B, in black) deposition.

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Fig. 2

Calcification inhibitor protein, osteopontin, upregulated as the addition of P in creased in both VSMCs (A, A7r5) and osteoblasts (B, MC3T3-E1). Cells were cultured with the designated P level for 12 days.

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Fig. 3

The addition of zinc prevented Ca and P accumulation in vascular smooth muscle cell A7r5 under calcified condition (A. at 3 and 5 mM P addition), while zinc stimulated Ca and P accumulation in osteoblasts. Cells were cultured with the designated Zn and phosphate level for 12 days.

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Notes

This work was supported by 2012 ANU Industry-Academic Research Grant from Andong National University.

References

1. Cousins RJ. A role of zinc in the regulation of gene expression. Proc Nutr Soc. 1998; 57(2):307–311.
crossref
2. MacDonald RS. The role of zinc in growth and cell proliferation. J Nutr. 2000; 130:5S Suppl. 1500S–1508S.
crossref
3. Ovesen J, Møller-Madsen B, Thomsen JS, Danscher G, Mosekilde L. The positive effects of zinc on skeletal strength in growing rats. Bone. 2001; 29(6):565–570.
crossref
4. Lowe NM, Lowe NM, Fraser WD, Jackson MJ. Is there a potential therapeutic value of copper and zinc for osteoporosis? Proc Nutr Soc. 2002; 61(2):181–185.
crossref
5. Kwun IS, Cho YE, Lomeda RA, Shin HI, Choi JY, Kang YH, Beattie JH. Zinc deficiency suppresses matrix mineralization and retards osteogenesis transiently with catch-up possibly through Runx 2 modulation. Bone. 2010; 46(3):732–741.
crossref
6. Alcantara EH, Lomeda RA, Feldmann J, Nixon GF, Beattie JH, Kwun IS. Zinc deprivation inhibits extracellular matrix calcification through decreased synthesis of matrix proteins in osteoblasts. Mol Nutr Food Res. 2011; 55(10):1552–1560.
crossref
7. Wu M, Rementer C, Giachelli CM. Vascular calcification: an update on mechanisms and challenges in treatment. Calcif Tissue Int. 2013; 93(4):365–373.
crossref
8. Steitz SA, Speer MY, McKee MD, Liaw L, Almeida M, Yang H, Giachelli CM. Regulation of cardiovascular calcification. Am J Pathol. 2002; 161(6):2035–2046.
9. Wesson JA, Johnson RJ, Mazzali M, Beshensky AM, Stietz S, Giachelli C, Liaw L, Alpers CE, Couser WG, Kleinman JG, Hughes J. Osteopontin is a critical inhibitor of calcium oxalate crystal formation and retention in renal tubules. J Am Soc Nephrol. 2003; 14(1):139–147.
crossref
10. Speer MY, Giachelli CM. Regulation of cardiovascular calcification. Cardiovasc Pathol. 2004; 13(2):63–70.
crossref
11. Villa-Bellosta R, Wang X, Millán JL, Dubyak GR, O'Neill WC. Extracellular pyrophosphate metabolism and calcification in vascular smooth muscle. Am J Physiol Heart Circ Physiol. 2011; 301(1):H61–H68.
crossref
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