Angiopoietin-2 Is Associated with Albuminuria and Microinflammation in Chronic Kidney Disease |
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Authors: | Fan-Chi Chang Tai-Shuan Lai Chih-Kang Chiang Yung-Ming Chen Ming-Shiou Wu Tzong-Shinn Chu Kwan-Dun Wu Shuei-Liong Lin |
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Affiliation: | 1. Renal Division, Department of Medicine, National Taiwan University Hospital, Taipei, Taiwan.; 2. Department of Internal Medicine, National Taiwan University Hospital Chu-Tung Branch, Hsin-Chu County, Taiwan.; 3. Graduate Institutes of Physiology, College of Medicine, National Taiwan University, Taipei, Taiwan.; 4. Department of Internal Medicine, National Taiwan University Hospital Bei-Hu Branch, Taipei, Taiwan.; University of Washington, United States of America, |
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Abstract: | Although cardiovascular disease (CVD) is the leading cause of mortality in patients with chronic kidney disease (CKD), the pathophysiology is not thoroughly understood. Given that elevated albuminuria or circulating angiopoietin-2 associates with CVD and mortality in CKD patients, we were intrigued by the relationship between albuminuria and angiopoietin-2. A total of 416 patients with CKD stages 3 to 5 were stratified by urine albumin-creatinine ratio as normoalbuminuria (<30 mg/g), microalbuminuria (30–300 mg/g), or macroalbuminuria (>300 mg/g). The levels of plasma angiopoietin-2 and vascular endothelial growth factor (VEGF) increased, and soluble Tie-2 decreased in the subgroups of albuminuria; whereas angiopoietin-1 did not change. Linear regression showed a positive correlation between urine albumin-creatinine ratio (ACR) and plasma angiopoietin-2 (correlation coefficient r = 0.301, 95% confidence interval 0.211–0.386, P<0.0001), but not between ACR and VEGF or soluble Tie-2. Multivariate linear regression analysis showed that plasma angiopoietin-2 was independently associated with ACR (P = 0.025). Furthermore, plasma angiopoietin-2 was positively correlated with high sensitive C-reactive protein (r = 0.114, 95% confidence interval 0.018–0.208, P = 0.020). In conclusion, plasma angiopoietin-2 was associated with albuminuria and markers of systemic microinflammation in CKD patients. Although previous evidence has shown that angiopoietin-2 destabilizes vasculature and induces inflammation in different scenarios, further study will be required to delineate the role of angiopoietin-2 in albuminuria and microinflammation in CKD patients. |
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