Glomerulopathies –IgA nephropathy IgA nephropathy - Pathogenesis

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  • Glomerulopathies IgA nephropathy IgA nephropathy - Pathogenesis
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  • Glomerulopathies IgA nephropathy IgA nephropathy - Pathogenesis Mesangial IgA promotes glomerular inflammation a series of events . can cause end stage renal disease
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy - Pathogenesis What specific mechanisms influence the deposition of IgA and its initiation of inflammation?
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy - Pathogenesis tightly T cell controlled processes in health most polymeric IgA is produced in the mucosal immune system is involved in mucosal defense the bone marrow produces monomeric IgA, which reaches the circulation
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy - Pathogenesis in IgA nephropathy synthesis of polymeric IgA is increased in the bone marrow and decreased in the mucosa
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy - Pathogenesis Yes it is
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  • Glomerulopathies IgA nephropathy IgA nephropathy - Pathogenesis Why might this happen? This process is very tightly T cell regulated In response to a mucosal antigen, T cells reach the circulation, but will return to the mucosa to synthesize polymeric IgA if they express alpha 4 beta 7, the mucosal homing receptor If on the other hand, a systemic antigen is confronted, T cells will home to the marrow if they express the alpha 4 beta 1 systemic homing receptor
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy - Pathogenesis in IgA nephropathy - these processes is abnormal there is an exaggeration of systemic homing receptor expression, which would drive T cells not back to the mucosa but towards the marrow the abnormal site of IgA1 production, which is one of the features of IgA nephropathy
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy - Pathogenesis in IgA nephropathy - these processes is abnormal but not only there is an exaggeration of systemic homing receptor expression, which would drive T cells not back to the mucosa but towards the marrow the abnormal site of IgA1 production, which is one of the features of IgA nephropathy structural abnormalities of the IgA molecule itself
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy - Pathogenesis Abnormal IgA1 molecule promote IgA1 self-aggregation production of macromolecular IgA1 act as an antigen production of IgA1-IgG complexes, which could be deposited influence interaction directly with matrix components and particularly with mesangial cells
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy - a great clinical heterogeneity
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy is often presenting as recurrent visible hematuria coinciding with mucosal infection which is almost never seen over the age of 40
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy a few patients will present nephrotic proteinuria
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy other patients will be picked up because they have an asymptomatic urine abnormality
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy others will already have advanced kidney disease when theyre first picked up
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  • Glomerulopathies IgA nephropathy
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  • Is this one disease? Is this the same disease were picking up at different stages? Prof J. Feehally Dept of Nephrology Leicester General Hospital Leicester, United Kingdom
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  • Glomerulopathies IgA nephropathy IgA nephropathy in a global view of this disease its extremely different in its prevalence
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy also a very variable prognosis
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy - prognosis proteinuria, hypertension and GFR at the time of diagnosis predict outcome thats true for any glomerular disease
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy prognosis glomerulosclerosis, interstitial fibrosis, tubular atrophy predict outcome thats true for any glomerular disease
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy prognosis proteinuria you have not just at presentation but during prolonged follow up is a very powerful predictor of outcome !!
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  • Glomerulopathies IgA nephropathy IgA nephropathy prognosis how much proteinuria you have during follow up combined with mean arterial pressure during follow up are the most powerful predictor of outcome
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy and Henoch Schonlein Purpura What is IgA nephropathy? characterised by predominant mesangial IgA deposits by immunofluorescence on the renal biopsy there is no clinical nor serological features, which are specific for IgA nephropathies to make the diagnosis, you really need a renal biopsy with appropriate immunofluorescence What is Henoch Schonlein Purpura? a true clinical syndrome characterised by palpable purpura, arthritis, and abdominal pain, and of course, a glomerulonephritis characterised by predominant IgA deposits
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura a more accurate definition of H.S.Purpura a small vessel vasculitis with IgA dominant deposits involving skin, gut, and glomeruli associated with arthritis
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  • Glomerulopathies IgA nephropathy
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  • IgA nephropathy and Henoch Schonlein Purpura IgA deposits in the mesangium for sure it is a primary IgA nephropathy or a H.S.Purpura rule out a systemic disease associated with IgA deposits
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura a typical picture of IgA deposits characterized by granular mesangial deposits of IgA
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura A more aggressive type of IgA nephropathy associated with much more massive immunoglobulin deposits of IgA there is thorough extension of IgA deposits along the capillary walls is usually associated with proliferative lesion and endocapillary proliferation
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura C3 is also found in the mesangium generally with a more or less identical pattern than for IgA generally the intensity is a little bit weaker
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura A more aggressive case - massive deposits of C3 in mesangial area, and also extension along the capillary walls
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura H.S.Purpura is generally a more aggressive type of glomerulonephritis than IgA nephropathy
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura
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  • Glomerulopathies IgA nephropathy IgA nephropathy and Henoch Schonlein Purpura