Volume 76, Issue 12, Pages (December 2009)

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Volume 76, Issue 12, Pages 1277-1283 (December 2009) Protein microarrays identify antibodies to protein kinase Cζ that are associated with a greater risk of allograft loss in pediatric renal transplant recipients  Scott M. Sutherland, Li Li, Tara K. Sigdel, Persis P. Wadia, David B. Miklos, Atul J. Butte, Minnie M. Sarwal  Kidney International  Volume 76, Issue 12, Pages 1277-1283 (December 2009) DOI: 10.1038/ki.2009.384 Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 1 Enzyme-linked immunosorbent assay (ELISA) analysis of 15 patients with acute rejection (AR) and 28 stable posttransplant patients. Among the three groups (pre-transplant, posttransplant with AR, and posttransplant stable) there was a non-significant trend toward higher at-event anti-protein kinase C-ζ (anti-PKCζ) levels (P=0.07). The three patients with high anti-PKCζ levels had a mean concentration of 109±34.4 pg/μl. This was more than three times the mean concentration of the remaining 12 patients, that is, 31.1±3.1 pg/μl. This difference was statistically significant (P<0.001). The long horizontal bars represent the mean value for each group and the short horizontal bars represent one standard deviation. None of the patients had high anti-PKCζ levels pre-transplant (mean value 30.9±5.1 pg/μl). This suggests that the anti-PKCζ response in the three patients is de novo. Kidney International 2009 76, 1277-1283DOI: (10.1038/ki.2009.384) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 2 Kaplan–Meier analysis of two subtypes of acute rejection (AR) based on serum anti-protein kinase C-ζ (anti-PKCζ) levels. The gray line represents the 12 patients with low serum anti-PKCζ levels and the black line represents the 3 patients with high serum anti-PKCζ levels. Allograft survival for patients with high anti-PKCζ levels was lower (33%) than that for patients with low anti-PKCζ levels (100%). This was significantly different (P=0.002). Kidney International 2009 76, 1277-1283DOI: (10.1038/ki.2009.384) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 3 Immunohistochemical staining for PKCζ in normal renal tissue and renal parenchyma experiencing acute rejection. Within normal kidney (a and b), cytoplasmic granular staining for PKCζ is observed in a subset of tubules morphologically compatible with distal tubules (b) and the smooth muscle cells of the arteries (a). Patchy endothelial cell staining is observed in a few capillaries. No significant staining is observed in glomeruli except for an occasional infiltrating lymphocyte. In acute rejection (c and d), the tubular staining is less intense, but the infiltrating lymphocytes are PCKζ-positive, both when scattered (d) and when arranged in aggregates (c). Negative controls were run to identify non-specific anti-PKCζ staining. Tissue from non-rejecting allografts had a similar staining pattern to those of normal kidney (data not shown). Kidney International 2009 76, 1277-1283DOI: (10.1038/ki.2009.384) Copyright © 2009 International Society of Nephrology Terms and Conditions