Serum from minimal change patients in relapse increases CD80 expression in cultured podocytes
- 673 Downloads
Minimal change disease (MCD) is the most common cause of nephrotic syndrome in children and is associated with the expression of CD80 in podocytes and the increased excretion of CD80 in urine. We hypothesized that serum from patients with MCD might stimulate CD80 expression in cultured podocytes.
Sera and peripheral blood mononuclear cells (PBMCs) were collected from subjects with MCD in relapse and remission and from normal controls. Immortalized human podocytes were incubated with culture media containing patient sera or supernatants from patient and control PBMC cultures. CD80 expression was measured by quantitative PCR and western blot analysis.
Sera collected from patients with MCD in relapse, but not in remission, significantly increased CD80 expression (mean ± standard deviation: 1.8 ± 0.7 vs. 0.8 ± 0.2; p < 0.004) and CD80 protein secretion by podocytes (p < 0.05 between relapse and normal controls). No such CD80 increase was observed when podocytes were incubated with supernatants of PBMC cultures from patients in relapse.
Sera from MCD patients in relapse, but not in remission, stimulated CD80 expression in cultured podocytes. Identifying this factor in sera could provide insights into the pathogenesis of this disorder. No role in CD80 expression by podocytes was found for cytokines released by PBMCs.
KeywordsCD80 Minimal change disease Nephrotic syndrome
Conflict of interest
We, the authors declare that the results presented in this paper have not been published previously in whole or part, except in abstract format. This work was supported by NIH R01DK080764. The authors declare no conflicts of interest.
- 6.Reiser J, von Gersdorff G, Loos M, Oh L, Asanuma K, Giardino L, Rastaldi MP, Calvaresi N, Watanabe H, Schwarz K, Faul C, Kretzler M, Davidson A, Sugimoto H, Kalluri R, Sharpe AH, Kreidberg JA, Mundel P (2004) Induction of B7-1 in podocytes is associated with nephrotic syndrome. J Clin Invest 113:1390–1397PubMedGoogle Scholar
- 10.International Study of Kidney Disease in Children (1981) Primary nephrotic syndrome in children: clinical significance of histopathologic variants of minimal change and of diffuse mesangial hypercellularity. A Report of the International Study of Kidney Disease in Children. Kidney Int 20:765–771CrossRefGoogle Scholar
- 11.Garin EH, Boggs KP (1987) Effect of peripheral blood mononuclear cells from patients with nephrotic syndrome on uptake of 35sulfate by glomerular basement membrane. Int J Pediatr Nephrol 6:189–194Google Scholar
- 18.Shimada M, Ishimoto T, Lee PY, Lanaspa MA, Rivard CJ, Roncal-Jimenez CA, Wymer DT, Yamabe H, Mathieson PW, Saleem MA, Garin EH, Johnson RJ (2012) Toll-like receptor 3 ligands induce CD80 expression in human podocytes via an NF-kappaB-dependent pathway. Nephrol Dial Transplant 27:81–89PubMedCrossRefGoogle Scholar