Abstract

Objective To study the feature of bone metabolism in different phase of elder type 2 diabetic nephropathy (DN) patients.Methods One hundred and fifty elder type 2 DN patients (non-microalbuminuria group,microalbuminuria group,clinic proteinuria group,DN renal inadequacy group and DN uremia group,each group was 30 cases),60 elder non-DN patients in chronic renal failure (CRF) (non-DN renal inadequacy group and non-DN uremia group,each group was 30 cases) ,and 30 elder healthy people (control group) were selected to observe the changes of osteocalcin (OT),β -crosslaps,parathyroid hormone ( iPTH),alkaline phosphatase (AKP),serum calcium (Ca),serum phosphorus (P) and Ca × P.Results In non-microalbuminuria group,microalbuminuria group and clinic proteinuria group,OT and β -crosslaps levels were lower than those in control group,and the lowest in microalbuminunia group (P＜0.01).In DN renal inadequacy group and DN uremia group,OT and β -crosslaps levels were higher than those in control group(P＜0.01).In the phase of CRF,OT,β -crosslaps and iPTH had no statistic difference between DN patients and non-DN patients,but had linear correlation.Serum P level was higher in DN renal inadequacy group and DN uremia group than that in control group(P＜0.01).Either DN or non-DN,serum P had more influence to Ca × P than serum Ca.Conclusions In the different phase of elder type 2 DNpatients,the effect of bone metabolism is different because of the different injury of renal function.Bone metabolism in the different phase has respective feature and mechanism,with low turnover in the first and high turnover in the end. Key words: Diabetic nephropathies; Malnutrition; Kidney failure,chronic; Osteocalcin; Collagen

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