Abstract
Albumin and alpha1-microglobulin (alpha1M) are absorbed by two specific receptors in tubular epithelial cells. Any cell injury will disturb the reabsorption of these proteins, The increased urinary excretions of albumin or alpha1M could thus serve as a marker of subclinical graft lesions and as an early indicator of chronic allograft dysfunction. We measured 24-hour urinary excretions of albumin, alpha1M, and transforming growth factor (TGF)-beta1 at 6 months after transplantation in 79 renal-graft recipients and recorded the changes in 24-hour creatinine clearance an average 51 (range 14-72) posttransplant follow-up months. At 6 months from transplantation, 46 of 79 (58%) patients were normoalbuminuric, 25 (32%) microalbuminuric, and 8 (10%) macroalbuminuric. In normoalbuminuric patients, urinary alpha1M/creatinine ratio was 10 times, and TGF-beta1/creatinine ratio approximately 5 times, higher than in the healthy subjects but lower than in albuminuric patients. In all patients, urinary alpha1M correlated with urinary TGF-beta1 (r=0.508, P<0.001), with albumin (r=0.220, P<0.05), and with the annual changes in 24-hour creatinine clearance (r=-0.273, P<0.05). During follow-up, renal function deteriorated in 20 of 33 (60%) patien...Continue Reading
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