Complement factor H deficiency and posttransplantation glomerulonephritis with isolated C3 deposits.

Abstract

We report the first cases of atypical hemolytic and uremic syndrome associated with complement factor H (CFH) deficiency in native kidneys and glomerulonephritis with isolated C3 deposits after kidney transplantation. Two boys developed atypical hemolytic and uremic syndrome at 16 and 11 months of age, associated with low C3 and CFH levels. Both rapidly progressed to end-stage renal failure and received a kidney transplant. Patient 1 had combined CFH and complement factor I (CFI) heterozygous mutations and a membrane cofactor protein (gene symbol, CD46) gene polymorphism. Five years posttransplantation, an allograft biopsy specimen showed numerous mesangial and extramembranous C3 deposits, although the patient had no biological sign of glomerulopathy. Nine years after transplantation, he was well with stable kidney function. Patient 2, who had a homozygous CFH mutation, developed glomerulonephritis with isolated C3 deposits 5 months after kidney transplantation while he was treated for early recurrence of hemolytic anemia. Four years later, the second kidney transplant biopsy specimen showed recurrence of thrombotic microangiopathy. Six years posttransplantation, kidney function was stable and complete blood cell count was normal with regular plasma therapy. These observations suggest that constitutional dysregulation of the alternative pathway is associated with a wide spectrum of kidney diseases, and glomerulonephritis with isolated C3 deposits and thrombotic microangiopathy may be different expressions of the same condition. Several factors could influence the disease, such as degree of CFH haploinsufficiency and other complement alternative pathway regulator abnormalities, such as a membrane cofactor protein polymorphism.

• Authors: Olivia Boyer, Laure-Hélène Noël, Eve Balzamo, Geneviève Guest, Nathalie Biebuyck, Marina Charbit, Rémi Salomon, Véronique Frémeaux-Bacchi, Patrick Niaudet
• Journal: American journal of kidney diseases : the official journal of the National Kidney Foundation (Am J Kidney Dis) Vol. 51 Issue 4 Pg. 671-7 (Apr 2008) ISSN: 1523-6838 [Electronic] United States
• PMID: 18371543 (Publication Type: Case Reports, Journal Article)

Chemical References

• Complement C3
• Complement Factor H

Topics

• Child, Preschool
• Complement C3 (metabolism)
• Complement Factor H (deficiency)
• Glomerulonephritis (etiology, metabolism, pathology)
• Hemolytic-Uremic Syndrome (complications)
• Humans
• Kidney Transplantation
• Male
• Postoperative Complications (etiology, metabolism, pathology)