Glomerular deposition of complement-control proteins in acute and chronic glomerulonephritis

Wyatt, Robert J.; McAdams, A. James; Forristal, Judith; Snyder, Jean; West, Clark D.
October 1979
Kidney International;Oct1979, Vol. 16 Issue 4, p505
Academic Journal
Acute poststreptococcal glomerulonephritis (AGN) differed from membranoproliferative glomerulonephritis (MPGN) and lupus nephritis (SLE) in that two of the proteins that control the C3b-dependent convertase. β1H and the C3bC4b-inactivator cofactor (C3bC4blCo), were frequently absent from the glomerular deposits. In addition, factor B was distributed with C3 in the capillary walls in hypocomplementemic AGN patients. From this, it can be assumed that C3bBb is in the deposits, uninhibited by control proteins as would be predicted for alternative pathway activation. Factor B could not be found in normocomplementemic AGN, was rarely present in M. PGN, but was usually present in SLE, most often in the mesangium. In MPGN and SLE, the control proteins were nearly always present in the glomeruli in a distribution like that of C3: in MPGN they were particularly abundant. Complement profiles indicated an occasional transient reduction in serum C4 level early in AGN. Thus, although there is occasional evidence of early classical activation in AGN, more characteristic is a long period of alternative activation. Serum levels of control proteins did not deviate greatly from normal except for reduced serum β1H levels in MPGN type I.


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