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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Calcium metabolic changes and calbindin-D in experimental hypertension.

OBJECTIVE: To examine renal and intestinal calbindin-D in relation to calcium metabolic changes in three different models of experimental hypertension. DESIGN: Spontaneously hypertensive rats (SHR), hypertension-prone Dahl salt-sensitive (Dahl-S) rats and the Goldblatt two-kidney, one clip rat model of renovascular hypertension were examined. RESULTS: Both prehypertensive and hypertensive SHR had significantly lower concentrations of both renal calbindin-D28k and intestinal calbindin-D9k than Wistar control rats. This was accompanied by hypocalcaemia, hypomagnesaemia and increased plasma 1,25(OH)2 vitamin D levels. Induction of hypertension in Dahl-S rats reduced intestinal calbindin-D9k and increased plasma levels of 1,25(OH)2 vitamin D, while renal calbindin-D28k levels, plasma calcium levels and plasma magnesium levels were unchanged. Renovascular hypertension was associated with a significant increase in the intestinal calbindin-D9k, plasma 1,25(OH)2 vitamin D, parathyroid hormone and magnesium levels, while renal calbindin-D2k, plasma calcium and phosphorus levels were unaffected. CONCLUSIONS: These three models of experimental hypertension have clearly demonstrated three separate patterns in the regulation of renal and intestinal calbindin-D, which relate to different alterations of factors involved in calcium and magnesium metabolism. In all three models hypertension was accompanied by a significant increase in plasma concentrations of 1,25(OH)2 vitamin D. Only rats with renovascular hypertension showed increased intestinal calbindin-D9k levels, whereas reduced concentrations were found in the SHR and in the hypertensive Dahl-S rats. This indicates the existence of a resistance at the cellular level to 1,25(OH)2 vitamin D affecting the expression of calbindin-D in both SHR and Dahl-S rats.[1]

References

  1. Calcium metabolic changes and calbindin-D in experimental hypertension. Hemmingsen, C., Staun, M., Lewin, E., Egfjord, M., Olgaard, K. J. Hypertens. (1994) [Pubmed]
 
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