The impact of different amounts of calcium intake on bone mass and arterial calcification in ovariectomized rats

Umon Agata, Jonghoon Park, Satoshi Hattori, Yuki Aikawa, Yuya Kakutani, Ikuko Ezawa, Takayuki Akimoto, Naomi Omi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Reduced estrogen secretion and low calcium (Ca) intake are risk factors for bone loss and arterial calcification in female rodents. To evaluate the effects of Ca intake at different amounts on bone mass changes and arterial calcification, 8-wk-old female Wistar rats were randomly placed in ovariectomized (OVX) control and OVX with vitamin D3 plus nicotine (VDN) treatment groups. The OVX with VDN rats were then divided into six groups to receive different amounts of Ca in their diets: 0.01%, 0.1%, 0.3%, 0.6%, 1.2%, or 2.4% Ca. After 8 wk of administration, low Ca intake groups with 0.01% and 0.1% Ca diets had significantly reduced bone mineral density (BMD) and bone mechanical properties as compared with those of the other groups, whereas high Ca intake groups with 1.2% and 2.4% Ca diets showed no differences as compared with the 0.6% Ca intake group. For both the 0.01% and 2.4% Ca intake groups, Ca levels in their thoracic arteries were significantly higher as compared with those of the 0.6% Ca diet group, and that was highly correlated with serum PTH levels. An increase in relative BMP-2 mRNA expression in the arterial tissues of the 0.01% and 2.4% Ca diet groups was also observed. These results suggested that extremely low Ca intake during periods of estrogen deficiency may be a possible risk for the complications of reduced BMD and arterial calcification and that extremely high Ca intake may promote arterial calcification with no changes in BMD.

Original languageEnglish
Pages (from-to)391-399
Number of pages9
JournalJournal of Nutritional Science and Vitaminology
Volume61
Issue number5
DOIs
Publication statusPublished - 2015 Dec 4

Keywords

  • Arterial calcification
  • Bone loss
  • Different calcium intake
  • Ovariectomy

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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