Volume 54, Issue 2, Pages (August 1998)

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Renal involvement in hepatitis C infection: Cryoglobulinemic glomerulonephritis Giuseppe D’Amico Kidney International Volume 54, Issue 2, Pages
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Volume 54, Issue 2, Pages 650-671 (August 1998) Renal involvement in hepatitis C infection: Cryoglobulinemic glomerulonephritis  Giuseppe D’Amico  Kidney International  Volume 54, Issue 2, Pages 650-671 (August 1998) DOI: 10.1046/j.1523-1755.1998.00028.x Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 1 (A) Patient 1, first biopsy. The glomerulus shows a marked endocapillary hypercellularity, mainly a massive infiltration of inflammatory mononuclear leukocytes (also in 1B). Mesangial cell proliferation and mesangial matrix expansion are mild. The majority of loops show a thickened glomerular capillary wall, with frequent double-contoured or split basement membrane. Huge deposits (“intraluminal thrombi”), which stain green or red, fill the capillary lumina (Masson trichrome ×250). (B) Patient 1, first biopsy. Immunohistochemical staining with anti-monocyte-macrophage antibody (CD68) confirms the massive intracapillary accumulation of these mononuclear leukocytes (immunoperoxidase ×250). (C) Patient 1, first biopsy. The medium-sized renal artery presents diffuse fibrinoid necrosis of the vessel wall (in red) and intraparietal and perivascular leukocyte infiltration (Masson trichrome ×250). (D) Patient 1, second biopsy. Glomerulus shows only mild segmental mesangial proliferation and moderate mesangial expansion. No thickening of the capillary walls, intraluminal deposits or intracapillary leukocyte infiltration are detectable (Masson trichrome ×250). (E) Patient 2, first biopsy. Glomerulus shows global endocapillary hypercellularity (mainly due to infiltration of mononuclear cells) and diffuse thickening of capillary walls with double-contoured appearance, as in Figure 1a. On the contrary, there are no intraluminal thrombi (Masson trichrome ×250). (F) Patient 3. A membrano-proliferative pattern, with intense mesangial proliferation and peripheral expansion associated with centrolobular sclerosis (lobular MPGN) is evident. Moderate endocapillary infiltration of mononuclear leukocytes also is present (Masson trichrome ×250). Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 1 (A) Patient 1, first biopsy. The glomerulus shows a marked endocapillary hypercellularity, mainly a massive infiltration of inflammatory mononuclear leukocytes (also in 1B). Mesangial cell proliferation and mesangial matrix expansion are mild. The majority of loops show a thickened glomerular capillary wall, with frequent double-contoured or split basement membrane. Huge deposits (“intraluminal thrombi”), which stain green or red, fill the capillary lumina (Masson trichrome ×250). (B) Patient 1, first biopsy. Immunohistochemical staining with anti-monocyte-macrophage antibody (CD68) confirms the massive intracapillary accumulation of these mononuclear leukocytes (immunoperoxidase ×250). (C) Patient 1, first biopsy. The medium-sized renal artery presents diffuse fibrinoid necrosis of the vessel wall (in red) and intraparietal and perivascular leukocyte infiltration (Masson trichrome ×250). (D) Patient 1, second biopsy. Glomerulus shows only mild segmental mesangial proliferation and moderate mesangial expansion. No thickening of the capillary walls, intraluminal deposits or intracapillary leukocyte infiltration are detectable (Masson trichrome ×250). (E) Patient 2, first biopsy. Glomerulus shows global endocapillary hypercellularity (mainly due to infiltration of mononuclear cells) and diffuse thickening of capillary walls with double-contoured appearance, as in Figure 1a. On the contrary, there are no intraluminal thrombi (Masson trichrome ×250). (F) Patient 3. A membrano-proliferative pattern, with intense mesangial proliferation and peripheral expansion associated with centrolobular sclerosis (lobular MPGN) is evident. Moderate endocapillary infiltration of mononuclear leukocytes also is present (Masson trichrome ×250). Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 1 (A) Patient 1, first biopsy. The glomerulus shows a marked endocapillary hypercellularity, mainly a massive infiltration of inflammatory mononuclear leukocytes (also in 1B). Mesangial cell proliferation and mesangial matrix expansion are mild. The majority of loops show a thickened glomerular capillary wall, with frequent double-contoured or split basement membrane. Huge deposits (“intraluminal thrombi”), which stain green or red, fill the capillary lumina (Masson trichrome ×250). (B) Patient 1, first biopsy. Immunohistochemical staining with anti-monocyte-macrophage antibody (CD68) confirms the massive intracapillary accumulation of these mononuclear leukocytes (immunoperoxidase ×250). (C) Patient 1, first biopsy. The medium-sized renal artery presents diffuse fibrinoid necrosis of the vessel wall (in red) and intraparietal and perivascular leukocyte infiltration (Masson trichrome ×250). (D) Patient 1, second biopsy. Glomerulus shows only mild segmental mesangial proliferation and moderate mesangial expansion. No thickening of the capillary walls, intraluminal deposits or intracapillary leukocyte infiltration are detectable (Masson trichrome ×250). (E) Patient 2, first biopsy. Glomerulus shows global endocapillary hypercellularity (mainly due to infiltration of mononuclear cells) and diffuse thickening of capillary walls with double-contoured appearance, as in Figure 1a. On the contrary, there are no intraluminal thrombi (Masson trichrome ×250). (F) Patient 3. A membrano-proliferative pattern, with intense mesangial proliferation and peripheral expansion associated with centrolobular sclerosis (lobular MPGN) is evident. Moderate endocapillary infiltration of mononuclear leukocytes also is present (Masson trichrome ×250). Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 2 Immunofluorescence micrographs. (A) Patient 1, first biopsy. Intense massive staining of some of the deposits filling the capillary lumina (see Figure 1a). Faint and irregular parietal deposits (IgG, ×250). (B) Patient 1, second biopsy. Few scattered segmental parietal deposits (IgG, ×250). (C) Patient 2, first biopsy. Diffuse granular subendothelial deposits along the capillary walls, without intraluminal staining (IgM, ×250). (D) Patient 3. Intense diffuse granular staining of peripheral loops (peripheral lobular pattern) (IgM, ×250). Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 2 Immunofluorescence micrographs. (A) Patient 1, first biopsy. Intense massive staining of some of the deposits filling the capillary lumina (see Figure 1a). Faint and irregular parietal deposits (IgG, ×250). (B) Patient 1, second biopsy. Few scattered segmental parietal deposits (IgG, ×250). (C) Patient 2, first biopsy. Diffuse granular subendothelial deposits along the capillary walls, without intraluminal staining (IgM, ×250). (D) Patient 3. Intense diffuse granular staining of peripheral loops (peripheral lobular pattern) (IgM, ×250). Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 2 Immunofluorescence micrographs. (A) Patient 1, first biopsy. Intense massive staining of some of the deposits filling the capillary lumina (see Figure 1a). Faint and irregular parietal deposits (IgG, ×250). (B) Patient 1, second biopsy. Few scattered segmental parietal deposits (IgG, ×250). (C) Patient 2, first biopsy. Diffuse granular subendothelial deposits along the capillary walls, without intraluminal staining (IgM, ×250). (D) Patient 3. Intense diffuse granular staining of peripheral loops (peripheral lobular pattern) (IgM, ×250). Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 2 Immunofluorescence micrographs. (A) Patient 1, first biopsy. Intense massive staining of some of the deposits filling the capillary lumina (see Figure 1a). Faint and irregular parietal deposits (IgG, ×250). (B) Patient 1, second biopsy. Few scattered segmental parietal deposits (IgG, ×250). (C) Patient 2, first biopsy. Diffuse granular subendothelial deposits along the capillary walls, without intraluminal staining (IgM, ×250). (D) Patient 3. Intense diffuse granular staining of peripheral loops (peripheral lobular pattern) (IgM, ×250). Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 3 Electron microscopy. (A) Patient 1, first biopsy. Huge intraluminal deposit totally fills the capillary lumen. Subendothelial parietal deposits are present. Inset showing a specific annular and cylindrical structure of deposits (original magnification ×3,600; inset ×22,000; uranyl acetate and lead citrate. Courtesy of Dr. E. Schiaffino, Pathology Department, S. Carlo Borromeo Hospital, Milan). (B) Patient 2, first biopsy. Double-contoured basement membrane characterized by interposition of macrophages with intracytoplasmic deposits, expression of their intense phagocytic activity (original magnification ×2800; uranyl acetate and lead citrate. Courtesy of Dr. E. Schiaffino, Pathology Department, S. Carlo Borromeo Hospital, Milan). Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 3 Electron microscopy. (A) Patient 1, first biopsy. Huge intraluminal deposit totally fills the capillary lumen. Subendothelial parietal deposits are present. Inset showing a specific annular and cylindrical structure of deposits (original magnification ×3,600; inset ×22,000; uranyl acetate and lead citrate. Courtesy of Dr. E. Schiaffino, Pathology Department, S. Carlo Borromeo Hospital, Milan). (B) Patient 2, first biopsy. Double-contoured basement membrane characterized by interposition of macrophages with intracytoplasmic deposits, expression of their intense phagocytic activity (original magnification ×2800; uranyl acetate and lead citrate. Courtesy of Dr. E. Schiaffino, Pathology Department, S. Carlo Borromeo Hospital, Milan). Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions

Figure 4 Proposed pathogenetic mechanisms for HCV-associated glomerulonephritis. IC, immune complex. (modified from Ref. 59) Kidney International 1998 54, 650-671DOI: (10.1046/j.1523-1755.1998.00028.x) Copyright © 1998 International Society of Nephrology Terms and Conditions