Aims: Elevated plasma soluble tumour necrosis factor receptor 1 (TNFR1) predicts long-term progression of chronic kidney disease. We investigated the association between elevated TNFR1 and the presence of renal disease in patients with Type 2 diabetes mellitus registering a haemoglobin A1c (HbA1c) >48mmol/mol despite medical therapy.
Methods: Using sensitivity, specificity and regression analyses we interrogated the association between plasma TNFR1 and presence of chronic kidney disease as assessed by the presence of microalbuminuria and/or an estimated glomerular filtration rate of less than 60ml/min/1.73m (stages 3-5 chronic kidney disease). The association of TNFR1 with C-reactive protein and leptin-adiponectin ratio as plasma markers of systemic inflammation and adipose stress respectively was also investigated.
Results: Upper quartile TNFR1 is independently associated with elevated urinary albumin-creatinine ratios, reductions in eGFR and strongly predicts the presence of stages 3-5 chronic kidney disease in regression modelling. Elevated TNFR1 levels are associated with increased plasma C-reactive protein and augmented leptin-adiponectin ratio.
Conclusions: Our study confirms plasma TNFR1 as a surrogate of renal structural and functional impairment in patients with type 2 diabetes mellitus. Association of TNFR1 with markers of systemic inflammation and adipose stress indicates that TNFR1 may be a biomarker of these processes as components of the pathogenesis of diabetic kidney disease.
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