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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Am+Soc+Nephrol
2016 ; 27
(5
): 1334-42
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Partial Complement Factor H Deficiency Associates with C3 Glomerulopathy and
Thrombotic Microangiopathy
#MMPMID26374608
Vernon KA
; Ruseva MM
; Cook HT
; Botto M
; Malik TH
; Pickering MC
J Am Soc Nephrol
2016[May]; 27
(5
): 1334-42
PMID26374608
show ga
The complement-mediated renal diseases C3 glomerulopathy (C3G) and atypical
hemolytic uremic syndrome (aHUS) strongly associate with inherited and acquired
abnormalities in the regulation of the complement alternative pathway (AP). The
major negative regulator of the AP is the plasma protein complement factor H
(FH). Abnormalities in FH result in uncontrolled activation of C3 through the AP
and associate with susceptibility to both C3G and aHUS. Although previously
developed FH-deficient animal models have provided important insights into the
mechanisms underlying susceptibility to these unique phenotypes, these models do
not entirely reproduce the clinical observations. FH is predominantly synthesized
in the liver. We generated mice with hepatocyte-specific FH deficiency and showed
that these animals have reduced plasma FH levels with secondary reduction in
plasma C3. Unlike mice with complete FH deficiency, hepatocyte-specific
FH-deficient animals developed neither plasma C5 depletion nor accumulation of C3
along the glomerular basement membrane. In contrast, subtotal FH deficiency
associated with mesangial C3 accumulation consistent with C3G. Although there was
no evidence of spontaneous thrombotic microangiopathy, the hepatocyte-specific
FH-deficient animals developed severe C5-dependent thrombotic microangiopathy
after induction of complement activation within the kidney by accelerated serum
nephrotoxic nephritis. Taken together, our data indicate that subtotal FH
deficiency can give rise to either spontaneous C3G or aHUS after a
complement-activating trigger within the kidney and that the latter is C5
dependent.