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  • Title: Glomerular expression of monocyte chemoattractant protein-1 is predictive of poor renal prognosis in pediatric lupus nephritis.
    Author: Marks SD, Williams SJ, Tullus K, Sebire NJ.
    Journal: Nephrol Dial Transplant; 2008 Nov; 23(11):3521-6. PubMed ID: 18495743.
    Abstract:
    BACKGROUND: Monocyte chemoattractant protein-1 (MCP-1) is upregulated and it recruits and activates inflammatory cells in murine lupus nephritis (LN). METHODS: Clinical outcomes of children with LN were examined in relation to glomerular expression of MCP-1 and macrophage infiltration, as determined by immunohistochemical staining of renal biopsy sections with MCP-1 and CD68. Sections were analysed using a modified histological score (H-score; maximum of 300) based on both percentage of positively stained cells and intensity of staining. RESULTS: Renal biopsies were examined from 34 children [27 (79%) female] aged 7.7-17.3 (median 13.7) years with 50% ISN/RPS Class IV LN. Renal dysfunction and proteinuria at follow-up of 2.2-15.4 (median 6.5) years were analysed with estimated glomerular filtration rates (eGFR) of 11.2-124.1 (median 93.6) ml/min/1.73 m(2) and urine albumin:creatinine ratios of 1-535 (median 63) mg/mmol. There was a correlation between glomerular expression of MCP-1 and CD68 (r = 0.98, P = 0.04; median modified H-score of 219.7 and 230.8, respectively). Patients with Class III and IV LN had increased glomerular expression of both MCP-1 and PGM1 compared to the other classes (P = 0.01) with Class IV-G LN patients having the most glomerular expression of MCP-1 (median of 227.3) and PGM1 (median of 237.5) and the worst renal prognosis (with proteinuria and reduced eGFR). CONCLUSIONS: There is a correlation between glomerular expression of MCP-1 and PGM1 and worsening renal prognosis in paediatric LN. Larger prospective studies of paediatric LN are required to further evaluate MCP-1 and other markers of disease progression.
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