Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Cellular zinc deficiency inhibits the mineralized nodule formation and downregulates bone-specific gene expression in osteoblastic MC3T3-E1 cells

  • Cho, Young-Eun (Department of Food Science and Nutrition, Andong National University) ;
  • Kwun, In-Sook (Department of Food Science and Nutrition, Andong National University)
  • Received : 2018.09.07
  • Accepted : 2018.10.14
  • Published : 2018.10.31
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Abstract

Purpose: Zinc (Zn) is an essential trace element for bone mineralization and osteoblast function. We examined the effects of Zn deficiency on osteoblast differentiation and mineralization in MC3T3-E1 cells. Methods: Osteoblastic MC3T3-E1 cells were cultured at concentration of 1 to $15{\mu}M$ $ZnCl_2$ (Zn- or Zn+) for 5, 15 and 25 days up to the calcification period. Extracellular matrix mineralization was detected by staining Ca and P deposits using Alizarin Red and von Kossa stain respectively, and alkaline phosphatase (ALP) activity was detected by ALP staining and colorimetric method. Results: Extracellular matrix mineralization was decreased in Zn deficiency over 5, 15, and 25 days. Similarly, staining of ALP activity as the sign of an osteoblast differentiation, was also decreased by Zn deficiency over the same period. Interestingly, the gene expression of bone-related markers (ALP, PTHR; parathyroid hormone receptor, OPN; osteopontin, OC; osteocalcin and COLI; collagen type I), and bone-specific transcription factor Runx2 were downregulated by Zn deficiency for 5 or 15 days, however, this was restored at 25 days. Conclusion: Our data suggests that Zn deficiency inhibits osteoblast differentiation by retarding bone marker gene expression and also inhibits bone mineralization by decreasing Ca/P deposition as well as ALP activity.

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