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Secondary Glomerulonephritis


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Title: Secondary Glomerulonephritis

Secondary Glomerulonephritis
Primary vs. Secondary
  • IgA nephropathy
  • Pauci-immune necrotizing and crescentic GN
  • Anti-GBM glomerulonephritis
  • Membranous glomerulopathy
  • Type I MPGN
  • Henoch-Schonlein purpura
  • Pauci-immune small vessel vasculitis
  • Goodpasture syndrome
  • SLE
  • Cryoglobulinemic vasculitis

Antibody-mediated GN
  • 3 types
  • Linear glomerular IgG staining (IF) with positive
    anti-GBM serology
  • Paucity of glomerular Ig staining (IF) with
    positive ANCA serology
  • Glomerular immune complex localization shown as
    granular staining (IF) with positive serology
    (a-DNA, hypocomplementemia, a-HCV, a-HBV, C3Nf,
    cryos, ASO, increased IgA)

Linear glomerular IgG staining (IF) with positive
anti-GBM serology
  • With lung hemorrhage (Goodpasture syndrome)
  • Without lung hemorrhage (a-GBM glomerulonephritis)

Paucity of glomerular Ig staining (IF) with
positive ANCA serology
  • No systemic vasculitis (ANCA glomerulonephritis)
  • Systemic vasculitis but no asthma no granuloma
    (microscopic polyangiitis)
  • Systemic vasculitis granulomas but no asthma
    (Wegener granulomatosis)
  • Systemic vasculitis eosinophilia asthma
    granulomas (Churg-Strauss syndrome)

Glomerular immune complex localization shown as
granular staining (IF) with positive serology
  • IgA but no vasculitis (IgA nephropathy)
  • IgA systemic vasculitis (H-S purpura)
  • SLE (LN)
  • Acute Strep/Staph infection (Acute
    post-infectious GN)
  • Mesangiocapillary changes (Type I MPGN)
  • GBM dense deposits (Type II MPGN)
  • Sub-epithelial deposits (Membranous GN)
  • 20 nm fibrils (Fibrillary GN)
  • Other features (Other GNs)

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  • Activation and clonal expansion of CD4 T cells ?
    release of cytokines ? activation of autoreactive
    B cells, proliferation differentiation ? excess
    of antibodies against nuclear antigens ANA, DNA,
    Sm, RNA, Ro, La others.
  • Immune complex deposition, complement activation
    ? complement-mediated damage
  • Nuclear antigens can bind to glomerular sites
    (especially subepithelial) ? in situ immune
    complex formation
  • HTN, APL antibodies can potentiate glomerular and
    vascular lesions

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Modified WHO Classification of LN
  • I normal glomeruli
  • II pure mesangial alterations
  • A normal LM, mesangial deposits on IF/EM
  • B mesangial hypercellularity and deposits on
  • III focal segmental glomerulonephritis
  • A w/ active necrotizing lesions
  • B w/ active sclerosing lesions
  • C w/ sclerosing lesions
  • IV diffuse glomerulonephritis (severe
    mesangial, endocapillary or mesangiocapillary
    proliferation and/or extensive subendothelial
  • A w/o segmental lesions
  • B w/ active necrotizing lesions
  • C w/ active and sclerosing lesions
  • D w/ sclerosing lesions
  • V diffuse membranous glomerulonephritis
  • A pure membranous GN
  • B associated with II-a or II-b lesions
  • VI advanced sclerosing GN

Course and Prognosis of LN
  • 129 pts with WHO class III (40) or class IV
    (60) LN between 1975-1997
  • 18 M, 72 F mean age 29 yrs 43 white 17 AA
    40 Hisp
  • 30 pts reached endpoint (doubling of
  • R. Graham Barr, Stephen Seliger, Gerald B. Appel,
    Ricardo Zuniga, Vivette DAgati, Jane Salmon and
    Jai Radhakrishnan. Prognosis in proliferative
    lupus nephritis the role of socio-economic
    status and race/ethnicity

Course and Prognosis of LN
  • Multivariate analysis of predictors of
    progression showed
  • Higher Screatinine
  • Heavier proteinuria
  • AA race
  • Low socioeconomic status
  • R. Graham Barr, Stephen Seliger, Gerald B.
    Appel, Ricardo Zuniga, Vivette DAgati, Jane
    Salmon and Jai Radhakrishnan. Prognosis in
    proliferative lupus nephritis the role of
    socio-economic status and race/ethnicity in NDT
    (2003) 18 2039-2046

Therapy of LN
  • Controversial
  • Class I II excellent renal prognosis
  • Treat only extrarenal manifestations
  • Class III
  • Severity, of glomeruli involved, ?necrotizing
    lesion(s), ?crescent(s)
  • Steroid-sensitive vs steroid-resistant

Therapy of LN
  • Class IV
  • Aggressive treatment to avoid irreversible renal
    damage (ESRD)

NIH Data
  • Data from the NIH have shown that patients with
    lupus nephritis who are treated with
    glucocorticoids and a prolonged course of
    cytotoxic agents have better long-term renal
    function than those treated with glucocorticoids

  • 107 patients with active lupus nephritis (median
    follow-up 7 yrs)
  • With oral prednisone alone, the probability of
    renal failure began to increase substantially
    after 5 yrs of observation
  • Renal function was better preserved in patients
    who received various cytotoxic-drug therapies,
    but the difference was statistically significant
    only for iv CyP plus low-dose prednisone as
    compared with high-dose prednisone alone (P
  • The advantage of treatment with iv CyP over oral
    prednisone alone was particularly apparent in the
    high-risk subgroup of patients who had chronic
    histologic changes on renal biopsy at study entry
  • Patients treated with iv CyP have not experienced
    hemorrhagic cystitis, cancer, or a
    disproportionate number of major infections
  • As compared with high-dose oral prednisone alone,
    treatment of lupus glomerulonephritis with iv CyP
    reduces the risk of ESRD with few serious
  • Austin HA III, Klippel JH, Balow JE, et al.
    Therapy of lupus nephritis controlled trial of
    prednisone and cytotoxic drugs. N Engl J Med

Plasmapheresis ?
  • The prognosis of patients with SLE who have GN,
    especially class III IV is poor, despite
    treatment with immunosuppressive therapy
  • Plasmapheresis therapy has been used, but there
    have been few controlled clinical observations of
    its efficacy

  • RCT of 86 patients with severe lupus nephritis in
    14 medical centers
  • Standard-therapy regimen of prednisone and CyP
    vs. standard therapy plus plasmapheresis (PEx)
  • PEx 3x weekly for 4 weeks
  • Drug therapy was standardized, with strict
    adherence to nine detailed medical-management
  • 46 patients received standard therapy and 40
    patients received standard therapy plus PEx (mean
    follow-up was 136 weeks)
  • 6 patients in the standard-therapy group and 8
    patients in the PEx group died
  • ESRD developed in 8 patients in the
    standard-therapy group vs. 10 in the PEx group
  • 30 pts reached stopping points (14 in the
    standard-therapy group and 16 in the PEx group
  • A similar number of patients in each group had a
    decrease in both the serum creatinine
    concentration and urinary protein excretion to
    approximately normal values
  • Patients treated with PEx had a significantly
    more rapid reduction of serum concentrations of
    antibodies against double-stranded DNA and
  • CONCLUSIONS Treatment with PEx plus a standard
    regimen of prednisone and cyclophosphamide
    therapy DOES NOT improve the clinical outcome in
    patients with SLE and severe LN, as compared with
    the standard regimen alone
  • Lewis EJ, Hunsicker LG, Lan S-P, Rohde RD,
    Lachin JM. A controlled trial of plasmapheresis
    therapy in severe lupus nephritis. N Engl J Med

  • The combination of cyclophosphamide and
    prednisolone is effective for the treatment of
    severe lupus nephritis but has serious adverse
    effects. Whether mycophenolate mofetil (MMF) can
    be substituted for cyclophosphamide is not known.

  • 42 patients with diffuse proliferative lupus
  • 21 pts in Group I Prednisolone and MMF given
    for 12 months
  • vs.
  • 21 pts in Group II Prednisolone and CyP given
    for 6 months, followed by prednisolone and
    azathioprine for 6 months
  • 81 of the 21 patients in Group I had a complete
    remission, and 14 had a partial remission vs.
    76 and 14, respectively, of the 21 patients in
    Group II
  • The improvements in the degree of proteinuria and
    the Salbumin and Screatinine concentrations were
    similar in the two groups
  • One patient in each group discontinued treatment
    because of side effects.
  • Infections were noted in 19 of the patients in
    Group I and in 33 of those in Group II (P0.29)
  • Other adverse effects occurred only in group 2
    they included amenorrhea (23), hair loss (19),
    leukopenia (10), and death (10)
  • Relapse rates were 15 and 11, respectively
  • Conclusions For the treatment of diffuse
    proliferative lupus nephritis, the combination of
    MMF and prednisolone is as effective as a regimen
    of CyP and prednisolone followed by azathioprine
    and prednisolone
  • Chan TM, Li FK, Tang CSO, et al. Efficacy of
    mycophenolate mofetil in patients with diffuse
    proliferative lupus nephritis. N Engl J Med

More data for MMF
  • 59 pts w/ LN (12 III, 46 IV, 1 V-b) all received
    induction therapy w/ iv CyP steroids (up to 7
    mos) followed by maintenance therapy (1-3 yrs)
  • Group I quarterly iv CyP ? 4 died, 3 ESRD
  • Group II azathioprine (1-3 mg/kg/d) ? 1 ESRD
  • Group III MMF (500-3000 mg/d) ? 1 died, 1 ESRD
  • Chronicity index was 1.9 points lower in the CyP
    group than in the MMF group (P0.009)
  • For patients with proliferative lupus nephritis,
    short-term therapy with iv CyP followed by
    maintenance therapy with MMF or azathioprine
    appears to be more efficacious and safer than
    long-term therapy with iv CyP.
  • Gabriel Contreras, M.D., M.P.H., Victoriano
    Pardo, M.D., Baudouin Leclercq, M.D., Oliver
    Lenz, M.D., Elaine Tozman, M.D., Patricia ONan,
    R.N., and David Roth, M.D. Sequential Therapies
    for Proliferative Lupus Nephritis, N Engl J Med

Antiphospholipid Antibody Syndrome
  • Associated with
  • Glomerular disease
  • Large-vessel renal involvement
  • Secondary hypercoagulable state
  • Dialysis patients
  • Kidney transplant patients

Anti-Phospholipid Antibodies
  • 4 types
  • Antibodies causing a false-positive VDRL
  • Lupus anticoagulants
  • Anticardiolipin antibodies
  • Antibodies to beta-2 glycoprotein-1

Antiphospholipid Antibody Syndrome
  • 30-50 of pts with APL antibodies have the
    primary APL syndrome (no identified autoimmune
  • Lupus anticoagulant
  • Antiphospholipid antibodies
  • Cardiolipin
  • Phosphatidylserine
  • Other phospholipids
  • Renal involvement in up to 25 of pts with
    primary APL syndrome
  • thrombosis of blood vessels arterial, glomerular
    capillaries, venous
  • Interstitial fibrosis and cortical atrophy

Antiphospholipid Antibody Syndrome
  • ESRD on HD 10-30 prevalence of APL antibodies
  • CKD and ESRD on PD much lower prevalence of APL
  • 20-60 SLE patients with APL antibodies who
    received renal transplants had
  • Venous thromboses (i.e. DVT)
  • PE
  • Persistent thrombocytopenia

Antiphospholipid Antibody Syndrome
  • 28 of 178 non-SLE transplant recipients had APL
    antibodies that were assoc w/ 3-4 fold increased
    risk of arterial and venous thromboses
  • HCV-positive renal transplant recipients with
    anticardiolipin antibodies appear to have a
    higher risk of TMA in the allograft

  • Remains to be defined
  • Higher IgG APL antibody titers blamed for
    increased incidence of thrombotic events
  • Aspirin for APL antibodies w/o thrombotic events
  • High-dose anticoagulation for APL syndrome
    (primary or sec to SLE)
  • Uncertain role of immunosuppression
  • In pregnancy with APL syndrome
  • Heparin and low-dose aspirin successful in
    several studies
  • Prednisone no success
  • In case of bleeding // thromboses despite
    adequate anticoagulation // pregnacy, some
    success reported with
  • Plasmapheresis corticosteroids
  • Other immunosuppressives
  • IVIG, Plaquenil (anecdotal)

Mixed Connective Tissue Disease
  • Overlap SLE/scleroderma/polymyositis
  • Very high ANA titer (often speckled)
  • ENA with anti-U1RNP antibodies
  • Glomerular lesions resemble the spectrum found in
  • Glomerular disease is the most common kidney
    lesion in MCTD
  • Up to 30 have mesangial deposits of IgG and C3
  • Focal proliferative GN with mesangial and
    subendothelial deposits
  • Glomerular fibrinoid necrosis and crescent
    formation are rare
  • Vascular lesions (when present) resemble those
    found in scleroderma

Primary systemic sclerosis
  • Anti-centromere antibodies (96) in pts with
    limited cutaneous scleroderma (including CREST
    syndrome) w/o renal disease
  • sensitivity is only 43 for cutaneous scleroderma
  • Presence of anti-centromere antibodies reduces
    the likelihood of developing renal complications

Primary systemic sclerosis
  • Anti-Scl-70 antibodies gt 90 positive predictive
    value for systemic sclerosis
  • Insensitive and not good for excluding systemic
  • Presence of anti-Scl-70 antibodies is a predictor
    of likelihood of renal involvement or patient

Wegener Granulomatosis
  • Systemic vasculitis
  • Necrotizing glomerular lesions
  • The classic histopathologic finding is focal
    segmental necrotizing and crescentic GN
  • Large number of crescents are more often found in
    c-ANCA positive pts

Wegener Granulomatosis Therapy
  • The heterogeneity of vasculitis and differing
    approaches to classification have hindered the
    accumulation of evidence to direct therapy
  • Most clinical trials have had sample sizes too
    small to allow conclusions to be made and
    treatment protocols have developed along
    empirical and, more recently, consensus lines
  • Vasculitis occurring in the context of Wegener's
    granulomatosis, microscopic polyangiitis,
    ChurgStrauss angiitis and polyarteritis nodosa
    appears to respond in a similar way to therapy
    and it is probable that disease severity should
    determine the protocol rather than diagnostic

Wegener Granulomatosis Therapy
  • When threatened vital organ damage is present,
    early effective treatment will improve long-term
    outcome, as has been demonstrated for renal
    vasculitis, where renal function at remission
    determines long-term renal survival. In this
    regard, early diagnosis, before organ damage is
    sustained, is more important than therapeutic
  • The importance of balancing treatment efficacy
    with toxicity recurs in the existing literature
    and has inspired the use of protocols of graded
    intensity for progressively severe vasculitis.
    The CYCAZAREM protocols also appear to favor
    efficacy over toxicity, because the remission
    rate was very high yet treatment toxicity
    contributed to deaths in six and caused serious
    adverse effects in over one quarter
  • In addition to the need for less toxic therapies
    overall, there is a more urgent requirement for
    the elderly to be regarded as a separate subgroup
    and appropriate protocols designed to offer a
    more favorable balance with less toxicity

Wegener Granulomatosis Therapy
  • The advent of newer immunosuppressives and
    biological agents targeting specific immune
    components offers exciting possibilities for the
    vasculitis specialist
  • Unfortunately, experience with these drugs in
    vasculitis is usually delayed until they are
    licensed for a particular indication, typically
    transplantation or rheumatoid arthritis. If
    proven effective and safe, the expense of these
    agents will also require the design of
    costbenefit strategies in vasculitis before they
    can be routinely recommended

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Microscopic polyangiitis
  • Systemic vasculitis
  • Necrotizing glomerular lesions
  • The classic histopathologic finding is focal
    segmental necrotizing and crescentic GN
  • Large number of crescents are more often found in
    c-ANCA positive pts

Churg-Strauss Syndrome (aka. Allergic
  • Rare systemic vasculitis
  • Only several hundred cases reported in the
    literature since the first case in 1951 (?
  • Vasculitis, asthma, organ infiltration by
    eosinophils, and peripheral eosinophilia
  • gt50 have kidney involvement in autopsy series
  • Clinical renal disease described in 25-90
  • Variety of lesions found on K. Bxs from normal
    to severe GN, vasculitis and interstitial
  • Necrotizing glomerular lesions are seen less
  • The classic histopathologic finding is focal
    segmental necrotizing GN, sometimes with small
  • In most cases the GN is mild, affects only
    several glomeruli and involves the tuft
  • Least likely (among the pauci-imune GNs) to be
    c-ANCA positive to have large number of

Temporal arteritis
  • Renal manifestations rare
  • Mild hematuria
  • Mild proteinuria
  • No renal failure

Takayasu Arteritis
  • Obliterative arteritis of the main renal artery ?
    renovascular HTN
  • Narrowing of the renal ostia due to abdominal
    aortitis ? renovascular HTN
  • Mild hematuria
  • Mild proteinuria
  • No renal failure
  • High BUN/serum creatinine ratio
  • Mild mesangial proliferative GN (IgG, IgM, IgA,
    C3, C4)

Anti-Endothelial Cell Antibodies (AECA)
  • Detected in the serum of pts with renal disease
    caused by GN and thrombotic angiopathies
  • Assay rarely used as diagnostic tool due to
    technical difficulty
  • AECA can be directed against large vessel
    endothelial cells (Takayasu arteritis, Kawasaki
    disease) and to microvascular endothelium in HIT,
    TTP, Behcet, multiple sclerosis

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Henoch-Schonlein Purpura
  • Discussed under Primary GN

Anti-GBM Disease and Goodpasture Syndrome
  • Discussed under Primary GN

Sjogren Syndrome
  • Tubulointerstitial involvement
  • Distal RTA
  • Impaired concentrating ability
  • Hypercalciuria
  • PT defects (less often)
  • Bland UA
  • Mild elevations of serum creatinine
  • GN (rarely) hematuria, proteinuria, renal
    insufficiency, NS, renal vasculitis (renal
    insufficiency and severe HTN)

  • Interstitial nephritis (typically granulomatos)
  • Nephrolithiasis
  • Tubular fxn abnormalities

Mixed Cryoglobulinemia
  • Assoc with a variety of
  • Infections
  • Collagen-vascular diseases
  • Lymphoproliferative diseases
  • Cryo
  • Type I single monoclonal Ig (Waldenstroms,
  • Type II (mixed) monoclonal Ig (IgM kappa in gt
    90) against polyclonal IgG (RF positive)
  • Type III (mixed) both polyclonal IgG IgM
  • Most types II III have HCV infection

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Inherited Disorders
  • Hereditary Nephritis (Alport disease)
  • Thin GBM Disease
  • Fabry Disease (Angiokeratoma Corporis Diffusum
  • Nail-Patella Syndrome (Hereditary

Inherited Mutations of Podocyte Proteins
  • Congenital NS of the Finnish Type (CNF)
  • Nephrin mutations
  • AR Nephrotic Syndrome
  • Podocin mutations

Inherited Mutations of Podocyte Proteins
  • AD Nephrotic Syndrome (FSGS)
  • Alpha-actinin-4 mutations
  • Altered mechanical properties of the podocytes
    (impaired cytoskeletal fxn)
  • Penetrancehigh
  • Subnephrotic proteinuria and progressive renal

Glomerular Manifestations of Liver Disease
  • Depends on the liver disease
  • Hepatitis B
  • Hepatitis C
  • Autoimmune Chronic Active Hepatitis
  • Cirrhosis

Glomerular Manifestations of Liver Disease
  • Cirrhosis
  • Clinically manifest GN is rare
  • IgA deposition noted in more than 50 of pts at
    both necropsy and bx (also found in some
    noncirrhotic kidney autopsy series)
  • Kidney biopsy
  • Mesangial Sclerosis (cirrhotic glomerular
  • MPGN
  • Henoch-Schonlein Purpura with RPGN (rarely)

  • Amyloidosis
  • Primary
  • Secondary
  • Waldenstrom macroglobulinemia
  • Sickle Cell Nephropathy

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