Expression of inflammasomes NLRP1, NLRP3 and AIM2 in different pathologic classification of lupus nephritis

Lupus nephritis (LN) is an immune-complex mediated nephritis with complicated pathogenesis. The aims of the present study were to investigate whether inflammasomes are activated in the renal pathology of LN patients and analyse the association of inflammasome activation in different classes of LN renal tissues with the disease activity. A total of 86 patients with renal biopsy-proven chronic kidney disease admitted in Xiangya Hospital from January 2015 to August 2018 were enrolled in the present study. Immunofluorescence analysis was applied to examine NLRP1, NLRP3 and AIM3 expression in renal tissues. AIM2 was mainly expressed in glomerular cells of LN class II. No obvious positive staining of AIM2 in renal tissues was found in other LN classes. NLRP1 and NLRP3 were mainly localised in tubular cells. NLRP1 was mainly expressed in tubular cells of LN class II and class IV while NLRP3 was expressed in tubular cells of LN class IV. Moreover, NLRP3 expression level was positive correlated with the activity index (AI) score in patients with LN. NLRP3, NLRP1 and AIM2 activation are involved in the progress of LN. NLRP3 activation has a positive correlation with the AI score of LN.