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[Fibrillary glomerulopathies]
1Service de Néphrologie, CHU Bichat, Paris.
Abstract:
Fibrillary glomerulonephritis is characterized by the presence, mainly in the mesangium, of fibrils demonstrated by electron microscopy of the renal parenchyma. There are several varieties of this disease, depending on the size and, above all, the composition of these fibrils. Thus, fibrillary glomerulonephritis in which the fibrils are made of the normal glomerular basement membrane components can be distinguished from a more frequent variety in which the fibrils are composed of circulating proteins deposited in glomeruli. For a long time, amyloid glomerular nephropathy has been the sole representative of the latter variety, but we now know that, beside renal amyloidosis, there is a non-amyloid fibrillary glomerulonephritis the fibrils of which are made of monoclonal or non-monoclonal immunoglobulins. If it were confirmed that the principal member of this variety, described as immunotactoid glomerulopathy, is frequently associated with monoclonal gammapathy, it would represent, together with amyloidosis and light chain deposition, another variety of glomerular lesions which may occur in monoclonal gammapathy.
Insights
Fibrillary glomerulonephritis involves fibrils in the kidney
Area of Science:
- Nephrology
- Pathology
- Electron Microscopy
Context:
- Fibrillary glomerulonephritis (FGN) is a kidney disease characterized by fibril deposition in glomeruli.
- FGN presents diverse forms based on fibril size and composition.
- Distinguishing FGN subtypes is crucial for understanding disease mechanisms.
Purpose:
- To differentiate FGN based on fibril composition.
- To explore the role of circulating proteins and immunoglobulins in FGN.
- To classify FGN subtypes, including amyloidosis and non-amyloid forms.
Summary:
- Fibrillary glomerulonephritis (FGN) is identified by mesangial fibrils via electron microscopy.
- FGN varieties include those with normal glomerular basement membrane components and those with deposited circulating proteins.
- Non-amyloid FGN, featuring immunoglobulin fibrils, is increasingly recognized alongside amyloidosis and light chain deposition.
Impact:
- This classification aids in understanding the pathogenesis of FGN.
- Identifies potential links between FGN and monoclonal gammopathies.
- Provides a framework for diagnosing and potentially treating FGN subtypes.