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  • Title: Anemia is associated with an elevated serum level of high-molecular-weight adiponectin in patients with type 2 diabetes independently of renal dysfunction.
    Author: Aso Y, Suganuma R, Wakabayashi S, Hara K, Nakano T, Suetsugu M, Matsumoto S, Nakamachi T, Takebayashi K, Morita K, Inukai T.
    Journal: Transl Res; 2009 Oct; 154(4):175-82. PubMed ID: 19766961.
    Abstract:
    Low serum adiponectin is associated with a high incidence of type 2 diabetes or coronary artery disease in the general population. Paradoxically, serum adiponectin is elevated in patients with chronic kidney disease (CKD), such as overt diabetic nephropathy. The current study aimed to investigate whether anemia was independently associated with the serum level of high-molecular-weight (HMW) adiponectin in patients with type 2 diabetes. We studied 207 type 2 diabetic patients (92 women and 115 men). Anemia was defined as a hemoglobin (Hb) <13.0g/dL in men and <12.0g/dL in women according to the guidelines of the World Health Organization (WHO). Overt nephropathy (CKD) was defined as clinical proteinuria and /or estimated glomerular filtration rate (eGFR) lower than 60mL/min for more than 3 months. The diabetic patients were divided into 4 groups according to the presence or absence of anemia and/or CKD. Serum HMW adiponectin levels were measured by a sandwich enzyme-linked immunosorbent assay. In all 207 patients with type 2 diabetes, serum total and HMW adiponectin levels were correlated positively with age, the duration of diabetes, high-density lipoprotein (HDL) cholesterol, urinary albumin, and serum erythropoietin, whereas negative correlations were found with body mass index, triglyceride, eGFR, Hb, hematocrit, and high sensitivity C-reactive protein. A stepwise regression analysis demonstrated that among several significant variables, Hb had the strongest independent influence on HMW adiponectin (beta =-0.487, P < 0.001). Diabetic patients of both sexes with anemia and CKD had the highest serum levels of HMW adiponectin among the 4 groups. In conclusion, anemia is associated with marked elevation of serum HMW adiponectin levels in diabetic patients who have CKD, and this elevation is independent of renal function.
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