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2016 ; 90
(1
): 109-22
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Distinct roles for the complement regulators factor H and Crry in protection of
the kidney from injury
#MMPMID27165610
Laskowski J
; Renner B
; Le Quintrec M
; Panzer S
; Hannan JP
; Ljubanovic D
; Ruseva MM
; Borza DB
; Antonioli AH
; Pickering MC
; Holers VM
; Thurman JM
Kidney Int
2016[Jul]; 90
(1
): 109-22
PMID27165610
show ga
Mutations in the complement regulatory proteins are associated with several
different diseases. Although these mutations cause dysregulated alternative
pathway activation throughout the body, the kidneys are the most common site of
injury. The susceptibility of the kidney to alternative pathway-mediated injury
may be due to limited expression of complement regulatory proteins on several
tissue surfaces within the kidney. To examine the roles of the complement
regulatory proteins factor H and Crry in protecting distinct renal surfaces from
alternative pathway mediated injury, we generated mice with targeted deletions of
the genes for both proteins. Surprisingly, mice with combined genetic deletions
of factor H and Crry developed significantly milder renal injury than mice
deficient in only factor H. Deficiency of both factor H and Crry was associated
with C3 deposition at multiple locations within the kidney, but glomerular C3
deposition was lower than that in factor H alone deficient mice. Thus, factor H
and Crry are critical for regulating complement activation at distinct anatomic
sites within the kidney. However, widespread activation of the alternative
pathway reduces injury by depleting the pool of C3 available at any 1 location.