KIM-1 level in urine with initial reduction of glomerular filtration rate in patients with various bronchial asthma variants

INTRODUCTION. Previously, we postulated the common pathogenetic mechanisms in bronchial asthma (BA) and chronic kidney disease (CKD). The kidney injury molecule-1 (KIM-1) is considered as an early biomarker of the proximal renal tubules damage. In the available literature, there is only one clinical study of KIM-1 in children BA.

THE AIM of the study is to  assess KIM-1 levels in different variants of BA.

PATIENTS AND METHODS. The 24 BA patients were examined. Glomerular filtration rate (eGFR) by CKD-EPI was calculated. The concentration of the kidney injury molecule -1 (KIM-1) in urine was determined by enzyme immunoassay. Urinary albumin was determined by the immunoturbidimetric method. VEGF-A in serum was determined by enzyme immunoassay (sandwich variant).

RESULTS. In the urine of BA patients, KIM-1 was detected, and its level in patients with a non-allergic variant is significantly higher than in patients with an allergic variant of the disease. Factor analysis was carried out, the following was revealed: the KIM-1 component with a high positive factor load is associated with a key characteristic of BA such as the severity of the disease course, as well as with a high negative factor load – with a component of the glomerular filtration rate; the KIM-1 component with a high positive factor load is associated with the presence of drug intolerance in BA patients; the microalbuminuria component is negatively associated with the severity of BA disease course, as well as with the components KIM-1, VEGF-A, which seems to be associated with the use of systemic glucocorticoids in severe BA disease course; the KIM-1 component is positively associated with the VEGF-A component, which may indicate possible KIM-1 involvement in hypoxic kidney injury in BA.

CONCLUSION. The obtained data suggest that in BA, first of all, in a non-allergic variant of the disease and in a severe course of BA, kidney injure is formed, detected using kidney injure molecule-1 KIM-1.

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