Patologia de glomerulonefrites
description
Transcript of Patologia de glomerulonefrites
The Pathology of
GLOMERULONEPHRITIS
A Tutorial.
byJohn Bradfield
previously Professor of HistopathologyUniversity of Bristol
EnglandUK
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Date created
October 2001
Copyright
Bristol BioMedical
Image ArchiveUniversity of Bristol
UK
Institute of Work
Department ofPathology & Microbiology
University of Bristol
UK
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Glomerulonephritis
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Glomerulonephritis
If that includes you
Help is at hand
Don’t worry
Why is this?……………………………………………….….
Why did I write this tutorial?…………………………………………………...
Because so many beginners find the subject both difficult and confusing.
Usually, because they were taught badly first time round.
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After you have worked through this tutorial
You will not only understand:
GLOMERULONEPHRITIS
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• the descriptive words used in the classification
•the pathology
•the causes and mechanisms
But you will also be able to:
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• read about glomerulonephritis with interest
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Previous knowledge requirements
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If in doubt
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You need to know a bit about
the normal histology of the human glomerulus.
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Previous knowledge requirements
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Done the test and ready to go?
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Part 2 = Main tutorial on Pathology of Glomerulonephritis
How to use this tutorial
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Part 1 = Introduction to the Basic Vocabulary of Glomerulonephritis in general.(A very short section.)
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BASIC VOCABULARY
GLOMERULONEPHRITIS
Welcome to Part 1
Basic Vocabulary
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Let’s start by spending some time on
How to use the words
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What is
GLOMERULONEPHRITIS?
Write down your Definition before you proceed
Definition:
Glomerulonephritis is the name given to:
Renal diseases in which
the main abnormality lies in the glomerulus.
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Glomerulonephritis
versus
Glomerular diseases
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• In spite of the name, “Glomerulonephritis” is often applied to all glomerular diseases, not just those in which there is inflammation (- itis).
• However, when the main feature is deposition of materials in the glomerulus, then these diseases are not traditionally included as glomerulonephritis.
Amyloid Diabetic glomerular disease
Examples ?
Primary
versus
Secondary Glomerulonephritis
• To be honest, which disease falls into which group is more governed by historical precedent than by biological sense.
• What to do?
Secondary glomerulonephritis
is where the glomerular damage is secondary to an
ongoing systemic disease in the rest of the body
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Only use the terms in the following way
Examples ? Systemic Lupus Erythematosus Henoch Schonlein Purpura Diabetes Mellitus
GLOMERULONEPHRITIS
Part 1
Basic Vocabulary
This section is now finished.
Click on this button to return to Index Pageto choose next Part
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MAIN TUTORIAL
Part 2 = Main Tutorial
Pathology
of
Glomerulonephritis
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Clinical Features
Pathology
Causes and Mechanisms
Eponymous
The KEY to understandingTHE CLASSIFICATION OF GLOMERULONEPHRITISlies in appreciating that :
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Each name may call on any of these components
The KEY to understanding GLOMERULONEPHRITIS lies in appreciating that each type is defined using these components.
Clinical Features
Pathology
Causes and Mechanisms
Eponymous
Because of this the next two slides will comprise a short detour into
Clinical ThingsandCauses and Mechanisms
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Each name may call on any of these components
One slide onImportant clinical things in glomerular disease
• Age
• Acute versus Chronic
• Clinical patterns
• Proteinuria - Symptomless (revealed only on tests)
- Nephrotic syndrome
• Haematuria - Symptomless (revealed only on tests)
Patient may notice
• Renal failure - (acute or chronic)
• Acute Nephritic Syndrome
• Secondary to other disease
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One slide on:Causes and mechanisms in glomerular disease
Primary glomerular disease (Glomerulonephritis)mostly immunological
• Glomerulus is innocent bystander
= Immune complex disease
• Antibodies directed against glomerular components
= Anti-basement membrane disease
• Don’t know
= Immunological mechanisms involved but mechanisms not known
Secondary glomerular disease (Glomerulonephritis and others)variety of mechanisms, some immunological
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That ends our various detours and distractions
Now
- at last -
THE PATHOLOGY
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There are several things to explore under this heading.You can choose from this list.
Pathology of Glomerular Disease
Use the arrow/hand to click on your choice
1. Patterns of damage
2. Light microscopy = histology
5. Clinical indications for a renal biopsy
6. How a renal biopsy is handled in the laboratory
3. Electron microscopy
4. Immunological
7. Exit tutorial
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PATTERNS OF CHANGE
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on
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Biopsy Pathology of Glomerular Disease
Patterns of glomerular damage
Pathological features of glomerulonephritis
Descriptive Terms
Patterns of Damage - 1
All glomeruli normal
= No glomerulonephritis
All glomeruli abnormal
= diffuse glomerulonephritis
Some glomeruli abnormal
= focal glomerulonephritis
(often secondary to
systemic disease)
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One Glomerulus compared with another
Pathological features of glomerulonephritis
Descriptive Terms
Patterns of Damage - 2
Normal
= No glomerulonephritis
Damage to part
of glomerulus only
= segmental glomerulonephritis
Damage to all parts
of glomerulus only
= globalglomerulonephritis
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Within a single glomerulus
There is one further pattern of damage within a single glomerulus thatis important because it:
1. Signifies very bad news
2. Picks out a particular group of patients under the collective title of
Pathological features of glomerulonephritis
Descriptive Terms
Patterns of Damage - 2
Within a single glomerulus
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There is one further pattern of damage within a single glomerulus thatis important because it:
1. Signifies very bad news
2. Picks out a particular group of patients under the collective title of
Otherwise left click in here
Rapidly Progressive Glomerulonephritis is uncommon but very serious.
Click here to learn more about it
Pathological features of glomerulonephritis
Descriptive Terms
Patterns of Damage - 2
Within a single glomerulus
Rapidly Progressive Glomerulonephritis
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Causes:
1. Bad end of the spectrum of many mechanismbut especially -
• Anti-basement membrane disease
inluding Goodpasture’s disease
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Goodpasture’s disease
Pathological features of glomerulonephritis
Descriptive Terms
Rapidly Progressive Glomerulonephritis
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Goodpasture’s Disease
Cause:
Specific auto immune immunoglobulin attackon basement membrane’s of1. Capillaries of the glomeruli in the kidneys and2. Capillaries in the lung.
Pathological features:
1. (Cresentic Glomerulonephritis)
2. Deposition of linear IgG and IgM along basement membranes.
Clinical features:
1. Rapidly Progressive Renal Failure
2. Haematuria
3. Haemoptysis
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That ends this mini-unit
on
Pathology of Glomerular Disease
Patterns of glomerular damage
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LIGHT MICROSCOPY
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Pathology of Glomerular Disease
Light microscopy
This section describes the
central basis for
the pathological classification of Glomerulonephritis
The way in is to start with
the normal components of the Human Glomerulus
Left click to proceedLeft click to enter
Cells
Endothelial cells
Normally present
Stuff = non-cellular material
Mesangial cellsEpithelial cells
Normally present
Glomerular Basement Membrane
Normal Components of the Human Glomerulus
Click anywhere to seea picture of a normal human glomerulus
against which to compare the various diseases.
A picture of a normal human glomerulusagainst which to compare the various diseases.
Tufts of capillaries
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Afferent arteriole
Thinbasement membranes
Bowman’s Space
Tufts of capillaries
Nuclei ofglomerular cells
Cells
Endothelial cells
Normally present
Stuff(= non-cellular material)
Mesangial cells
Epithelial cells
Normally present
Capillary Basement Membrane
What can change in disease ?
Too many cells= proliferation
Thickening of thebasement membrane
Mesangium = stalk
First let’s look at changes the previously normal components.
Click to see changes in resident normal cellsNow click to see changes in normal non-cellular stuff.Left click to proceed.
Cells
Endothelial cells
Normally present
Stuff(= non-cellular material)
Mesangial cells
Epithelial cells
Normally present
Capillary Basement Membrane
What can change in disease ?
Too many cells= proliferation
Thickening of thebasement membrane
Mesangium = stalk
Now we will look at abnormal components that can appear in disease.
Click when you are ready.
Cells
Endothelial cells
Normally present
Stuff(= non-cellular material)
Mesangial cells
Epithelial cells
Normally present
Capillary Basement Membrane
Amyloid
Collagen scars (glomerulosclerosis)
Myeloma protein
Diabetic depositsDeposits
Fibrin
What can change in disease ?
Too many cells= proliferation
Thickening of thebasement membranes
Mesangium = stalk
Only presentwhen abnormal
Only presentwhen abnormal
Left first click to see abnormal cells.Now left click to see abnormal non-cellular stuff.Left click to see how this slide provides the key tothe histological classification of glomerulonephritis.
Inflammatory cells
Too many cells= inflammation.
But still called “proliferation”
HISTOLOGICAL CLASSIFICATION OF GLOMERULAR DISEASE
Some important things
• It is more important to know how the nomenclature and classification worksrather than knowing a great deal about every type of glomerulonephritis.
• The following pictures are for illustration and interest.
You do not need to learn the skill of recognising the diagnosis from the histology.(that important skill is for the renal pathologists alone, and very difficult it often is).
• Many facts are introduced as questions.
If this is your first visit, do not worry if you cannot answer the questions.If you could - you would not need the tutorial.
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HISTOLOGICAL NAMES USED IN GLOMERULONEPHRITIS
Proliferative glomerulonephritis
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Too many cells =
What is this called?
Left click anwhere for next
HISTOLOGICAL NAMES USED IN GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Left click anywhere to find out
Too many cells =
Thickening of basement membranes =
What is this called?
Left click anwhere for next
HISTOLOGICAL NAMES USED IN GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
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Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Have a guess. It’s easier than you think
What is this called?
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HISTOLOGICAL NAMES USED IN GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Left click anywhere to find out
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
What is this called?
Nephrotic syndrome but thickening of basement membranes =
Left click anwhere for next
HISTOLOGICAL NAMES USED IN GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Left click anywhere to find out
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
What is this called?
Nephrotic syndrome but thickening of basement membranes =
Left click to proceed
HISTOLOGICAL NAMES USED IN PRIMARY GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
Nephrotic syndrome but thickening of basement membranes =
Click in each box in turn to explore each type in turn
SECONDARY GLOMERULONEPHRITISleft click in here
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Epithelial cells(as “Cresents” inBowman’s space)
Diffuse Proliferative g/n
Proliferative glomerulonephritis (too many cells)
Rapidly Progressive g/n
HISTOLOGICAL CLASSIFICATION OF GLOMERULAR DISEASE
Inflammatory cells
Endothelial cells
Mesangial cellsMesangio-proliferative g/ntypical of Berger’s disease
Left click anywhere to learn more
Epithelial cells(as “Cresents” inBowman’s space)
Diffuse Proliferative g/n
Proliferative glomerulonephritis (too many cells)
Rapidly Progressive g/n
HISTOLOGICAL CLASSIFICATION OF GLOMERULAR DISEASE
Inflammatory cells
Endothelial cells
Mesangial cells
Left click anywhereto see a picture
and to read aboutthe clinical correlations
of each
Mesangio-proliferative g/ntypical of Berger’s disease
but
Diffuse proliferative g/n
Too many cells (endothelial and mesangial)Swelling of cells
Normal basement membranes(not visible in this section)
Left click anywhere for clinical correlations
Clinical Correlations
• Presents as acute nephritic syndrome.
• When associated with an acute onset and a recent history of sore throat, this would be characteristic of
post-streptoccocal immune complex glomerulonephritis.
• Can occur in other types of glomerulonephritis,both primary and secondary.
• When post-strep. - excellent prognosis especially in children.Left click a
nywhere for clinical correlations
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but
Mesangio proliferative g/n
Left click anywhere for clinical correlations
Clinical Correlations
Berger’s disease. (hint > Frenchman and so pronounced “Bearjey”.)
Children and adults.
Presents with recurrent painless haematuria=/- proteinuria and hypertension.
Characteristically has IgA deposition in mesangium.
Prognosis good.
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nywhere for clinical correlations
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Too many mesangial cells
Normal basement membranes
Cresentic g/n (different stain)
Bowman’s space expandedand filled with proliferating epithelial cellsto form a cresent.
Collapsed tufts ofdamaged glomeruli
Clinical Correlations
Left click anywhere for clinical correlationsLeft click a
nywhere for clinical correlationsThat finished this section -left click anywhere to proceed
If 80% of the glomeruli show epithelial cell cresents, this is bad new.
Because of this -The diseases that show this change are usually grouped together under the collective label of Rapidly Progressive Glomerulonephritis (including Goodpasture’s disease).
They present with devastating haematuria and proteinuria and renal failure.
And have a very poor prognosis.
HISTOLOGICAL NAMES USED IN PRIMARY GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
Neohrotic syndrome but thickening of basement membranes =
Click in each box in turn to explore each type in turn
SECONDARY GLOMERULONEPHRITISleft click in here
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Membranous g/n
Increased thickness ofbasement membranes
No increase in numbers of cells
but
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Clinical Correlations
Usually due to chronic immune complex disease. What are the likely antigens? In UK: most - don’t know
but can be malignancy or drugs (penicillamine)
In Japan: Most likely to be Hepatitis B
In some parts of Africa: Most likely to be Malaria
Presents with proteinuria.Commonest cause of nephrotic syndrome in adults in UK.
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nywhere for clinical correlationsLeft click anywhere to return
HISTOLOGICAL NAMES USED IN PRIMARY GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
Neohrotic syndrome but thickening of basement membranes =
Click in each box in turn to explore each type in turn
SECONDARY GLOMERULONEPHRITISleft click in here
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and
Membrano-proliferative g/n
Too many cells
Thickening of allthe basement membranes
Left click anywhere for clinical correlations
Clinical Correlations
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nywhere for clinical correlations
There are in fact three types of Membrano-proliferative g/n
Presentation
Proteinuria or Nephrotic syndrome
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nywhere for clinical correlations
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HISTOLOGICAL NAMES USED IN PRIMARY GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
Neohrotic syndrome but thickening of basement membranes =
Click in each box in turn to explore each type in turn
SECONDARY GLOMERULONEPHRITISleft click in here
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Three types of Membrano-proliferative g/n
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Type 1 = Mesangiocapillary g/n
• Immune complex mediated
• Causes mostly unknownSome associated with infections, drugs, tumours, etc.
• Many associated with persistent C3 hypocomplementaemia
• Course = progressive deterioration
Type 2 = Dense deposit disease
• Related to activation of the alternate complement pathway
• Dense deposits in basement membrane are not immune complexes
Type 3
• Rare
HISTOLOGICAL NAMES USED IN PRIMARY GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
Neohrotic syndrome but thickening of basement membranes =
Click in each box in turn to explore each type in turn
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Minimal change glomerulonephritis
Light microscopy (histology)
Left click anywhere for clinical correlations
Electron microscopy
- essentially normal
- fusion of epithelial cell foot processes. (this is not specific for any one type of glomerulonephritis. It correlates with heavy proteinuria.)
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nywhere for clinical correlationsLeft click anywhere to return
Clinical Correlations
Cause unknown
Presents with steroid responsive nephrotic syndrome.
Commonest (90%) cause of nephrotic syndrome in children aged 1-5 in UK. These children are not usually biopsied.
Rapid response to steroids.
Prognosis
Children - excellent. Adults - variable.
HISTOLOGICAL NAMES USED IN PRIMARY GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
Neohrotic syndrome but thickening of basement membranes =
Click in each box in turn to explore each type in turn
SECONDARY GLOMERULONEPHRITISleft click in here
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Focal glomerular sclerosis
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Clinical Correlations
Presents with proteinuria.
In UK. Cause of 10%-15% of nephrotic syndrome.
Also associated with other diseases (secondary g/n)
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Collagen scar tissue (stained red)in some glomeruli but not othersand in one part of the glomerulus
Prognosis
Most patients eventually develop end stage renal failure.
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HISTOLOGICAL NAMES USED IN PRIMARY GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
Neohrotic syndrome but thickening of basement membranes =
Click in each box in turn to explore each type in turn
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Autoimmune diseaseswith immune complexes as the
mechanism of glomerular damage
It is convenient to group these under three headings
SECONDARY GLOMERULONEPHRITIS
Metabolic diseasesvarious mechanisms of glomerular damage
Vascular diseasesvarious mechanisms of glomerular damage
Otherwise left click anywhere else to return
for more on eachleft click in here
HISTOLOGICAL NAMES USED IN PRIMARY GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
Neohrotic syndrome but thickening of basement membranes =
Click in each box in turn to explore each type in turn
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Autoimmune diseaseswith immune complexes as the mechanism of glomerular damage
SECONDARY GLOMERULONEPHRITIS
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Examples include
Systemic lupus erythematosusvariety of pathological patternsvariety of clinical presentations
Henoch-Schonlein purpura
clinical patterns include nephrotic syndromeand rapidly progressive g/n
SECONDARY GLOMERULONEPHRITIS
Examples include
Diabetes mellitusWhole range of patterns of damage to kidneysWhole range of patterns of damage in glomeruli.Cinically glomerular damage causes proteinuria
nephrotic syndrome and renal failure.
Renal amyloidIn virtually all patients with systemic amyloid.Presents as proteinuria/nephrotic syndrome -
often presenting feature. Inevitable renal failure
Metabolic diseasesvarious mechanisms of glomerular damage
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Diabetic nodular glomerulopathy
There is a variety of different ways in which diabetes mellitus affects the glomeruli
This is the pattern that is usually illustrated in books -not because it is the commonest, but because it is the most specific for DM.
and because it has a long eponymous name = Kimmelsteil-Wilson lesion.(you only need to remember it if you hare going for the gold medal.
It’s more important to know thisfact:half of patients with childhood onset DM die in renal failure
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SECONDARY GLOMERULONEPHRITIS
Examples include
Microscopic Polyarteritis nodosaDifferent disease than classical PAN.Prognosis untreated very poor but
very good response to immuno-suppression.
Haemolytic-uraemic syndromeClinically - acute nephropathy, haemolysis and thrombocytopaenia.
Prognosis depends on type:Childhood (better prognosis)Adult (poorer prognosis)Secondary (poorer prognosis)
Vascular diseasesvarious mechanisms of glomerular damage
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HISTOLOGICAL NAMES USED IN PRIMARY GLOMERULONEPHRITIS
Membranous glomerulonephritis
Proliferative glomerulonephritis
Membrano-proliferative glomerulonephritis
Minimal Change glomerulonephritis
Focal Glomerulosclerosis
Too many cells =
Thickening of basement membranes =
Increase number of cells and thickening of basement membranes =
Collagen scars in some glomeruli =
Neohrotic syndrome but thickening of basement membranes =
Click in each box in turn to explore each type in turn
SECONDARY GLOMERULONEPHRITISleft click in here
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That ends the mini-unit
on
Biopsy Pathology of Glomerular Disease
Light microscopy
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ELECTRON MICROSCOPY
Welcome to a mini-unit
on
Pathology of Glomerular Disease
Electron microscopy
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ELECTRON MICROSCOPY
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Electron microscopy makes some important contributions
• to the understanding of the glomerulus in health
• to the understanding of mechanisms of disease
• in diagnosis
Changes with Proteinuria
Normal Appearances
Immune Complex Disease
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Pathology page
ELECTRON MICROSCOPY
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Here is our standard histological light microscope picture of a normal human glomerulus
Now let’s imagine that we could peer
at great magnificationinto Bowman’s space
andlook at the external
(downstream) side of one of these capillaries.
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NORMAL APPEARANCES
The next slide will be a scanning electron microscope pictureof exactly this - at great magnification
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Tufts of capillaries
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And here we are
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Bowman’s space
We are now in Bowman’s space
andhere are all the capillaries.
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Bowman’s space
Tufts of capillaries
Now let’s wind up the magnification even furtherand look at the outside (downstream) side of one single calillary
And this is what we would see
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Bowman’s space
The downstream side of allthe capillaries are clothed in
epithelial cells thathave complicated
interdigitating patternsthat are traditionally called
foot processes.
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Now let’s break open this capillary and look insideto see the upstream side of the filter
which is the endothelial lining of the blood capillary.
Bowman’s space
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Bowman’s space
And here is the endothelial celllining of the blood capillary.
Look at the 3.5nm poresin the endothelial cell lining.
These hold back the blood cellbut allow plasma access
to the basement membranefilter underneath.
Here again is the downstreamside of the filter
with the interlacing footprocesses of theepithelial cells.
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Now let’s see what this would look like ina conventional electron transmission microscope
which is a very thin section in two dimensions only
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Now let’s see what this would look like ina conventional electron transmission microscope
which is a very thin section in two dimensions only
And here is theendothelial cell liningof the blood capillary.
We can hardly see
the poresin the endothelial cell lining.
Here are the foot processes of the epithelial cells.
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Red cells
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Red cells
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In diagnostic pathology transmission electron microscopyis usually used, rather than scanning electron microscopy
Changes with Proteinuria
Normal Appearances
Immune Complex Disease
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ELECTRON MICROSCOPY
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Proteinuria is associated with a change in the configuration of the interlacing pattern of the epithelial cell foot processes.
On scanning electron microscopy the processes become simplified so that the outer surface of the basement membranes is covered in sheets rather than processes.
This configuration can be seen on the more usual transmission electron microscopy., where it is historically known as “fusion of the foot processes”
Comments:1. Correlates with heavy proteinuria.2. ? cause ? effect ?3. Not specific to any particular type of glomerulonephritis.
CHANGES WITH PROTEINURIA
Page one of one
Changes with Proteinuria
Normal Appearances
Immune Complex Disease
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ELECTRON MICROSCOPY
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Although immune complexes can be identified by immunofluoresence, it is sometimes helpful to know exactly where these deposits are in relation to the basement membranes.
IMMUNE COMPLEX DISEASE
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(Page one of three)
Immune complex disease
Sub-epithelial deposits in post-streptococcal g/n
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(Page two of three)
Immune complex disease
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(Page three of three)
Deposits within thickened basement membranes in membranous g/n
Changes with Proteinuria
Normal Appearances
Immune Complex Disease
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ELECTRON MICROSCOPY
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That ends the mini-unit
on
Pathology of Glomerular Disease
Electron microscopy
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IMMUNOLOGY
Welcome to a mini-unit
on
Pathology of Glomerular Disease
Immunological investigation of a
renal biopsy.
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IMMUNOLOGY
• Antibodies are prepared, specific for abnormal things that might be present in the diseased glomerulus.
• A fluorescent molecule is attached to the back end of the antibody molecule so that the molecule will be visible down the light microscope under ultra-violet light.
• Thin sections are cut from the frozen fresh material.
• These are then “stained” using specific antibodies prepared in the laboratory.
• The “stained” sections are viewed under ultra-violet light.
• Positive “staining” appears as green fluorescence on a black background
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IMMUNOLOGY
Antibody molecule
Antigen-specific terminal
Fluorescent molecule
Target material
Tissue section
Glass slide
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IMMUNOLOGY
Usually three variables are scored.
1. Identity of abnormal materials in glomerulus.
Usually patient’s own immune reactants egIgGIgMIgAC3
2. Where is it? eg In capillary loopsIn mesangium
3. What is it like? eg lumpy-bumpy granularlinear
Left click anywhere to see three examples
Which immune reactants?
IgG +/- IgMComplement C3
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Interpretation ?
Immune complex deposition
Pattern ?Lumpy-bumpy granular
Where?
in walls of glomerular capillaries
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Interpretation ?
Anti-basement membrane disease (Goodpasture’s)
Pattern?
Linear
Which immune reactants?
IgG +/- IgMComplement C3
Where?
in walls of glomerular capillaries
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Interpretation ?
Berger’s IgA disease
Pattern ?Granular
Which immune reactants?
IgAComplement C3
Where?
In mesangial stalks
There are several things to explore under this heading.You can choose from this list.
Pathology of Glomerular Disease
Use the arrow/hand to click on your choice
1. Patterns of damage
2. Light microscopy = histology
5. Clinical indications for a renal biopsy
6. How a renal biopsy is handled in the laboratory
3. Electron microscopy
4. Immunological
7. Exit tutorial
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That ends the mini-unit
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Pathology of Glomerular Disease
Immunological investigation of arenal biopsy
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CLINICAL INDICATIONS FOR A RENAL BIOPSY
Welcome to a mini-unit
on
Pathology of Glomerular Disease
Clinical indications for a renal biopsy
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(three slides only)
CLINICAL INDICATIONS FOR A RENAL BIOPSY
General principles
• Making a diagnosis
• Planning treatment
• Deciding when not to treat
• Assessing prognosis
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CLINICAL INDICATIONS FOR A RENAL BIOPSY
• Proteinuria with impairment of renal function
• Symptomless isolated proteinuria if more than 2g/day
• Nephrotic syndrome in adultsIn children it is most likely to be due to steroid sensitiveminimal change g/n so trial of steroids is less risky than biopsy.
• Persistent haematuria with proteinuria especially if there is renal impairment.
• Acute renal failure if likely to be renal on origin, as opposed to pre-renal (hypovolaemic shock) or post-renal (obstructive) in origin.
• Chronic renal failure with normal sized kidneys
• Renal transplant dysfunction
• Systemic disorders with features that include haematuria, proteinuria and renal failure.
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• Asymmetric kidneys
• Tiny shrunken kidneys
• Obstructive renal disease
• Coagulation defects
• Acute infections
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SOMECONTRA-INDICATIONS FOR A RENAL BIOPSY
That ends the mini-unit
on
Pathology of Glomerular Disease
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Clinical indications for a renal biopsy
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BIOPSY
Welcome to a mini-unit
on
Pathology of Glomerular Disease
How a renal biopsy is handled in the laboratory
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One slide only
HOW A RENAL BIOPSY IS HANDLED IN THE LABORATORY
For histology(light microscopy)
For electronmicroscopy
Forimmuno-fluorescence
Core of fresh tissue
Dissected into three partsensuring some glomeruli in each
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That ends the one page mini-unit
on
Pathology of Glomerular Disease
left click in here to return to “Pathology” page
How a renal biopsy is handled in the laboratory
They don’t come any more “mini” than that.
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TEST
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Try this short test to find out whether you need to revise some basic things about the human glomerulus.
Revision Test: The structures of the nephron.
Can you name these eight components of the nephron?
Write down the 8 answers before you proceed.
Then left click to see all the answers.
1.
2.
5.
3.
8.
7.
4.
6.
Glomerulus Tubules
Revision Test: The structures of the nephron.
Don’t cheat.
There’s no point.
You are only cheating yourself.
Left click to proceed
1.
2.
5.
3.
8.
7.
4.
6.
Glomerulus Tubules
Revision Test: The structures of the nephron.
Have you written downall 8?
Don’t proceed untilyou have.
The next slide givesthe answers.
Then left click to see all the answers.
1.
2.
5.
3.
8.
7.
4.
6.
Glomerulus Tubules
1. Afferent arteriole
3. Efferent arteriole
4. Capsule of glomerular sac
2. Glomerular capillaries
5. Proximal convoluted tubule
6. Loop of Henle
7. Distalconvolutedtubule
8. CollectingDuct
Revision Test: The structures of the nephron.
left click to continue the short test
left click for all of the answers.
Revision Test : Components of the Glomerulus
Can you list?
The five important components of the normal human glomerulus.
Cells
1. ???
lining the capillaries.2. ???downstream of thebasement membranes.
3. ???
controlling cellsin the supporting stalk.
Non-cellular components
4. ???
this is the actual filter.
5. ???
the supporting stalk.
left click for next.
The five important components of the normal human glomerulus
Cells
1. Endothelial cells -
lining the capillaries.
2. Epithelial cells - downstream of the basement membranes.
3. Mesangial cells -
in the mesangial stalk.
Non-cellular components
4. Capillary Basement Membranes - this is the actual filter.
5. Mesangium -
the supporting stalk.
Revision Test : Components of the Glomerulus
1.
2.
3.
4.
left click for all of the answers.
Revision Test: Clinical Manifestations of disease
Can you list the clinical manifestations of
glomerular disease = Glomerulonephritis?
1. Haematuria.
2. Proteinuria.
3. Renal failure.
4. Any combination of these.
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The clinical manifestations of
glomerular disease = Glomerulonephritis?
Revision Test: Clinical Manifestations of disease
How did you get on?
If you struggled with the quiz - I suggest that you Work through a tutorial on Bristol Biomed entitled “Understanding the Glomerulus”. It will take you about 15 minutes, and has some excellent animations.
When you get back you will then be equipped to conquer the subject of
GLOMERULONEPHRITIS.
Previous knowledge requirements
To return to the main tutorial on Pathology of Glomerulonephritisleft click on this button
To exit and return to Bristol Biomed for a background tutorial on the Glomerulusleft click on this button
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EXIT
I hope that this tutorial has been useful.
If you liked it,
or didn’t,
or have any suggestions:
Then please let me know on: [email protected]
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How to EXIT THE TUTORIAL
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