Diabetes research and clinical practice · 2009
Are low erythropoietin and 1,25-dihydroxyvitamin D levels indicative of tubulo-interstitial dysfunction in diabetes without persistent microalbuminuria?
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Singh Dhruv K, Winocour Peter, Summerhayes Bev, Viljoen Adie, Sivakumar G, Farrington Ken
Аннотация
AIMS: To investigate the relationship between Erythropoietin (EPO) and 1,25-dihydroxyvitamin D levels, and tubular damage in patients with diabetes mellitus (DM) without persistent microalbuminuria.
METHODS: We measured serum EPO and 1,25-dihydroxyvitamin D levels and tubular injury markers such as urinary N-acetyl-beta-d-glucosaminidase (NAG) and retinol binding protein (RBP) levels in 41 non-diabetic controls, 40 patients with Type 1 and 40 with Type 2 DM.
RESULTS: Median serum EPO levels were lower in Type 1 (2.57 mIU/ml: p<0.001) and Type 2 DM (5.69 mIU/ml: p=0.044) than in controls (8.76 mIU/ml), though haemoglobin levels did not differ. Median 1,25-dihydroxyvitamin D levels were lower in Type 1 (41.0 pmol/l: p=0.001) and Type 2 DM (41.8 pmol/l: p=0.035) than in controls (56.1 pmol/l), though serum creatinine, calcium, phosphate and PTH levels did not differ. Median RBP excretion was higher in Type 2 DM (0.35 mg/l vs. 0.23 mg/l: p=0.013) than in controls. Median NAG excretion was higher in Type 1 DM (1,079 micromol/h vs.1,030 micromol/h: p=0.048) compared to controls.
CONCLUSIONS: Tubulo-interstitial damage with low levels of EPO and 1,25-dihydroxyvitamin D occurs early in Type 1 and Type 2 DM before persistent microalbuminuria.
METHODS: We measured serum EPO and 1,25-dihydroxyvitamin D levels and tubular injury markers such as urinary N-acetyl-beta-d-glucosaminidase (NAG) and retinol binding protein (RBP) levels in 41 non-diabetic controls, 40 patients with Type 1 and 40 with Type 2 DM.
RESULTS: Median serum EPO levels were lower in Type 1 (2.57 mIU/ml: p<0.001) and Type 2 DM (5.69 mIU/ml: p=0.044) than in controls (8.76 mIU/ml), though haemoglobin levels did not differ. Median 1,25-dihydroxyvitamin D levels were lower in Type 1 (41.0 pmol/l: p=0.001) and Type 2 DM (41.8 pmol/l: p=0.035) than in controls (56.1 pmol/l), though serum creatinine, calcium, phosphate and PTH levels did not differ. Median RBP excretion was higher in Type 2 DM (0.35 mg/l vs. 0.23 mg/l: p=0.013) than in controls. Median NAG excretion was higher in Type 1 DM (1,079 micromol/h vs.1,030 micromol/h: p=0.048) compared to controls.
CONCLUSIONS: Tubulo-interstitial damage with low levels of EPO and 1,25-dihydroxyvitamin D occurs early in Type 1 and Type 2 DM before persistent microalbuminuria.