Expression of MCP-1 in renal tissues of patients with IgA nephropathy / 中南大学学报(医学版)

ABSTRACT

Objective To investigate the differential expression of monocyte ehemoattraetant protein-1 (MCP-1) in renal biopsy tissues of patients with IgA nephropathy, and to analyse the association between these 2 markers and their effect on various pathologic types of IgA nephropathy. Methods According to pathologic type, 88 renal biopsy tissues of patients with IgA nephropathy were divided into 4 groups a minimal change group, a mesangial proliferative glomerulonephritis group, a focal sclerosing glomerulonephritis group, and a diffused sclerosing glomerulonephritis group. Immunohistochemical staining was used to detect the in situ expression of MCP-1 and CD68 on renal biopsy tissues. The expression levels were semi-quantified by image analysis and clinical data were collected from the patients. Results The differences in glomerular MCP-1 expressions were not statistically significant among all groups, while the tubulointerstitial MCP-1 expressions were statistically different among the 4 groups, with the average scores of 1.43 ± 0. 60, 5.98 ±0.92, 10. 60 ± 0.76 and 11.65 ±0.39 for minimal change group, mesangial proliferative glomerulonephritis group, focal sclerotic glomerulonephritis, and diffused sclerotic glomerulonephritis group, respectively. The tubular and interstitial CD68 scores were 0. 75 ± 0. 71, 5. 87 ± 0. 96, 10. 42 ± 0. 61, and 11.40 ±0.49 for the 4 groups, with significant differences in both MCP-1 and CD68 among the 4 groups. Correlation analysis indicated a positive correlation between tubulointerstitial MCP-1 and CD68 (r = 0. 688, P ＜ 0. 01) . MCP-1 in tubulointerstitial was significantly correlated with 24 h urinary protein excretion (r=0.531, P＜0.01). Conclusion MCP-1 plays a critical role in mac-rophage infiltration in the kidney. MCP-1 is associated with the severity of tubulointerstitial damage and clinical prognosis.