Membranoproliferative glomerulonephritis classification: Difference between revisions
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==Overview== | ==Overview== | ||
Like many forms of glomerulopathies, membranoproliferative glomerulonephritis (glomerulopathy) has been a diagnosis of tissue pathology rather the diagnosis of a specific disease entity. Therefore the term membranoploriferative glomerulonephritis (MPGN) relates to a pattern of glomerular injury which can be caused by many disease states. Historically the nephropathologists divided MPGN into 3 distinctive categories to shed light into what may be causing this type of kidney injury: | Like many forms of glomerulopathies, membranoproliferative glomerulonephritis (glomerulopathy) has been a diagnosis of tissue pathology rather the diagnosis of a specific disease entity. Therefore the term membranoploriferative glomerulonephritis (MPGN) relates to a pattern of [[glomerular]] injury which can be caused by many disease states. Historically the nephropathologists divided MPGN into 3 distinctive categories to shed light into what may be causing this type of kidney injury: | ||
MPGN type 1: mesangial and subendothelial electron dense deposits | MPGN type 1: mesangial and subendothelial electron dense deposits MPGN type 2: electron dense material in the [[glomerular]] basement membrane | ||
MPGN type 2: electron dense material in the glomerular basement membrane | MPGN type 3: subepithelial deposits with basement [[membrane]] spikes This categorization, however is now out of date. The recognition of several new disorders as the underlying cause of MPGN, and the lack of clinical, [[prognostic]] or [[therapeutic]] relevance made this categorization less useful. For completeness and to help better accommodate the transition from old to new classification, below both classifications are reviewed. Classification of MPGN based on immunofluorescence [[microscopy]] is a result of all advances in the understanding of the [[pathogenesis]] of the disease. Based on this advanced techniques, there are three types of MPGN <ref name="pmid20185597">{{cite journal| author=Sethi S, Zand L, Leung N, Smith RJ, Jevremonic D, Herrmann SS et al.| title=Membranoproliferative glomerulonephritis secondary to monoclonal gammopathy. | journal=Clin J Am Soc Nephrol | year= 2010 | volume= 5 | issue= 5 | pages= 770-82 | pmid=20185597 | doi=10.2215/CJN.06760909 | pmc=2863981 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=20185597 }} </ref>:Immune-complex-mediated MPGN (Type I) ,[[Complement (biology)|Complement]]-mediated MPGN (Type II), Non-Ig/complement-mediated MPGN (Type III) | ||
MPGN type 3: subepithelial deposits with basement membrane spikes | |||
This categorization, however is now | |||
Classification of MPGN based on immunofluorescence microscopy is a result of all advances in the understanding of the pathogenesis of the disease. Based on this advanced techniques, there are three types of MPGN <ref name="pmid20185597">{{cite journal| author=Sethi S, Zand L, Leung N, Smith RJ, Jevremonic D, Herrmann SS et al.| title=Membranoproliferative glomerulonephritis secondary to monoclonal gammopathy. | journal=Clin J Am Soc Nephrol | year= 2010 | volume= 5 | issue= 5 | pages= 770-82 | pmid=20185597 | doi=10.2215/CJN.06760909 | pmc=2863981 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=20185597 }} </ref>:Immune-complex-mediated MPGN (Type I) ,Complement-mediated MPGN (Type II), Non-Ig/complement-mediated MPGN (Type III) | |||
==Classification== | ==Classification== | ||
MPGN can be classified three types based on immunofluorescence microscopy techniques . <ref name="pmid21839367">{{cite journal| author=Sethi S, Fervenza FC| title=Membranoproliferative glomerulonephritis: pathogenetic heterogeneity and proposal for a new classification. | journal=Semin Nephrol | year= 2011 | volume= 31 | issue= 4 | pages= 341-8 | pmid=21839367 | doi=10.1016/j.semnephrol.2011.06.005 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21839367 }} </ref>; | |||
*[[Immune complexes|Immune-complex]]-mediated MPGN (Type I) | |||
*Immune-complex-mediated MPGN (Type I) | |||
*Complement-mediated MPGN (Type II) | *Complement-mediated MPGN (Type II) | ||
*Non-Ig/complement-mediated MPGN (Type III) | *Non-Ig/[[complement]]-mediated MPGN (Type III) | ||
=== Type I === | |||
It is the most common type. | It is the most common type. | ||
* Circulating immune complexes are present in approximately 33% . | * Circulating [[immune complexes]] are present in approximately 33% . | ||
* Immune complexes are found in the mesangium and subendothelial spaces. | * [[Immune complexes]] are found in the [[mesangium]] and subendothelial spaces. | ||
===Type II=== | ===Type II=== | ||
* Dense deposits are observed in MPGN type II. | * Dense deposits are observed in MPGN type II. | ||
* Complement mediated | |||
* They are continuous, dense ribbon along the basement membranes of the glomeruli, tubules, and Bowman's capsule . | * They are continuous, dense ribbon along the basement membranes of the glomeruli, [[tubules]], and [[Bowman's capsule]] . | ||
===Type III=== | ===Type III=== | ||
Type III is very rare | |||
* It is characterized by a combination of subepithelial deposits, deposits in the mesangium and subendothelial space | * It is characterized by a combination of subepithelial deposits, deposits in the [[mesangium]] and subendothelial space. | ||
* There is complex disruption of the glomerular basement membrane with large lucent area. | * There is complex disruption of the [[glomerular]] basement membrane with large [[lucent area]]. | ||
==References== | ==References== | ||
Latest revision as of 01:01, 3 August 2018
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Membranoproliferative glomerulonephritis Microchapters |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Ali Poyan Mehr, M.D. [2] Olufunmilola Olubukola M.D.[3]
Overview
Like many forms of glomerulopathies, membranoproliferative glomerulonephritis (glomerulopathy) has been a diagnosis of tissue pathology rather the diagnosis of a specific disease entity. Therefore the term membranoploriferative glomerulonephritis (MPGN) relates to a pattern of glomerular injury which can be caused by many disease states. Historically the nephropathologists divided MPGN into 3 distinctive categories to shed light into what may be causing this type of kidney injury: MPGN type 1: mesangial and subendothelial electron dense deposits MPGN type 2: electron dense material in the glomerular basement membrane MPGN type 3: subepithelial deposits with basement membrane spikes This categorization, however is now out of date. The recognition of several new disorders as the underlying cause of MPGN, and the lack of clinical, prognostic or therapeutic relevance made this categorization less useful. For completeness and to help better accommodate the transition from old to new classification, below both classifications are reviewed. Classification of MPGN based on immunofluorescence microscopy is a result of all advances in the understanding of the pathogenesis of the disease. Based on this advanced techniques, there are three types of MPGN [1]:Immune-complex-mediated MPGN (Type I) ,Complement-mediated MPGN (Type II), Non-Ig/complement-mediated MPGN (Type III)
Classification
MPGN can be classified three types based on immunofluorescence microscopy techniques . [2];
- Immune-complex-mediated MPGN (Type I)
- Complement-mediated MPGN (Type II)
- Non-Ig/complement-mediated MPGN (Type III)
Type I
It is the most common type.
- Circulating immune complexes are present in approximately 33% .
- Immune complexes are found in the mesangium and subendothelial spaces.
Type II
- Dense deposits are observed in MPGN type II.
- Complement mediated
- They are continuous, dense ribbon along the basement membranes of the glomeruli, tubules, and Bowman's capsule .
Type III
Type III is very rare
- It is characterized by a combination of subepithelial deposits, deposits in the mesangium and subendothelial space.
- There is complex disruption of the glomerular basement membrane with large lucent area.
References
- ↑ Sethi S, Zand L, Leung N, Smith RJ, Jevremonic D, Herrmann SS; et al. (2010). "Membranoproliferative glomerulonephritis secondary to monoclonal gammopathy". Clin J Am Soc Nephrol. 5 (5): 770–82. doi:10.2215/CJN.06760909. PMC 2863981. PMID 20185597.
- ↑ Sethi S, Fervenza FC (2011). "Membranoproliferative glomerulonephritis: pathogenetic heterogeneity and proposal for a new classification". Semin Nephrol. 31 (4): 341–8. doi:10.1016/j.semnephrol.2011.06.005. PMID 21839367.