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  • Title: Glycemic control reverses increases in urinary excretions of immunoglobulin G and ceruloplasmin in type 2 diabetic patients with normoalbuminuria.
    Author: Narita T, Fujita H, Koshimura J, Meguro H, Kitazato H, Shimotomai T, Kagaya E, Suzuki K, Murata M, Usami A, Ito S.
    Journal: Horm Metab Res; 2001 Jun; 33(6):370-8. PubMed ID: 11456288.
    Abstract:
    To examine whether urinary excretions of plasma proteins with molecular radii of 45-55 A and different isoelectric points such as IgG (pI = 7.4) and ceruloplasmin (pI = 4.4) increase selectively in normoalbuminuric type 2 diabetic patients, urinary albumin excretion rate (AER), renal clearances of IgG, ceruloplasmin and alpha2-macroglobulin, and creatinine clearance (Ccr) were studied in timed overnight urine samples of 36 diabetic outpatients and 16 control subjects. Furthermore, to examine effect of glycemic control on these urinary protein excretions, the same analysis was performed before and after glycemic control in 17 diabetic inpatients admitted for glycemic control. Renal clearances of IgG and ceruloplasmin were significantly higher in diabetic outpatients than in the control group, whereas AER and renal clearance of alpha2-macroglobulin did not differ. Glycemic control caused significant decreases in renal clearances of IgG and ceruloplasmin, accompanied with tendency for Ccr to decrease (p = 0.055). The present results, together with our previous finding of selectively increased urinary excretions of 45-55 A sized plasma proteins in parallel with enhanced glomerular filtration rate after acute protein loading, led us to conclude that enhanced intraglomerular hydraulic pressure may cause increases in clearances of IgG and ceruloplasmin, and that this change can be reversed by strict glycemic control in normoalbuminuric diabetic patients.
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