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36 renal biopsies from patients with nephritis were studied for glomerular localization of the heavy chain subgroups of immunoglobulin G (IgG or gammaG). The deposition pattern of these subgroups was selective and did not reflect the normal serum concentration of these proteins. gammaG2, which comprises 18% of normal serum gammaG, was the predominant or unique subgroup deposited in five cases of lupus nephritis and four biopsies with other forms of nephritis associated with granular gammaG deposits. gammaG3, which normally makes up only 8% of the serum gammaG, was the dominant subgroup seen in one biopsy of lobular glomerulonephritis. Patients with linear gammaG deposits generally had a selective absence of gammaG3 and often had large amounts of gammaG4 (normally 3% of the serum gammaG) deposited. The deposition of complement components C1q, C4, and C3 was variable. One biopsy had only gammaG2 and no complement components in the deposits and had no neutrophile leukocyte infiltration. This latter observation correlates well with the poor ability of gammaG2 to fix complement in vitro. Similarly, deposits containing large amounts of gammaG4, which does not fix complement, also tended to have less inflammatory infiltrate than deposits devoid of this subgroup. The selective deposition of monotypic or restricted gammaG subgroups on the glomerulus supports the likelihood that the gammaG represents antibody. The nature of the subgroup involved in the deposit may represent one variable in the determination of the inflammatory and morphological picture that evolves in human glomerulonephritis.

Gamma G globulin subgroup composition of the glomerular deposits in human renal diseases