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Effect of low-dose methylprednisolone on calcium balance and bone composition in rats

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Abstract

Glucocorticoid induced osteoporosis has been associated with high doses and it has been partially attributed to decreased absorption and to increased calcium excretion. The present study examined the effect of low but effective doses of methylprednisolone (MP) on calcium balance and on skeleton in rats. Total duration of the experiment 29 days. Thirty-one male Wistar rats (MP group) were injected with 4mg/kg body weight MP sc at the 1st, 11th and 20th day of the experiment and 28 rats (C group) were used as matched controls. The 1st, 11th and 20th day of the experiment rats were placed in individual metabolic cages for three days. Food and water consumption were measured at the 2nd and 3rd days after each injection; urine and faeces were collected at the same days for calcium estimation. Calcium intake and excretion after each injection was significantly lower in the MP group as compared to controls. A statistically significant positive correlation between calcium consumption and calcium excretion was found in both groups resulting in a negative final balance. Rats were killed the 29th day. Adrenal weight was statistically significant lower in MP group (p<0.001). Morphometric properties were evaluated for the right femur. No significant difference was found between the two groups. Mineral and calcium content was slightly increased in the MP group. According to these results, it seems that methylprednisolone while effective on HPA axis did not have any effect on calcium absorption and on bone calcium deposition in rats.

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Voulgaris, A., Liapi, C. & Papadopoulos, J. Effect of low-dose methylprednisolone on calcium balance and bone composition in rats. J Endocrinol Invest 20, 659–663 (1997). https://doi.org/10.1007/BF03348027

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