Research on Nephropathology

11 important questions on Research on Nephropathology

What to do (therapy) with a leaky glomerulus/nepron?

Decrease blood-reassure

Why do we need different antibodies of different species to stain different colors?

Because otherwise the same sheep green antibody will reactie to the same structure as the red antibody of sheep and will cooler yellow, so you won't be able to distinguish different structures anymore

Name two new insights in nephrotic syndrome?

  • Glomerular filtration barrier; 'the electrokinetic model'
  • Development of FSGS lesions: 'the role of parietal epithelial cells' immunohistological stainings
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Glomerular filtration barrier

Nephrotic syndrome: heavy proteinuria > 3 gram/day hypoalbuminemia, hyperlipidemia and edema.

cause: leaky filter

What makes the glomerular filtration barrier charge and size selective? Why does the filter never clog?

Due to filtration of charged molecules there is a electric potential over the filtration barrier. Any molecule in the barrier will be removed by electrophoresis

What determines the glomerular permeability?

Electrical forces

What morphological change of the podocyte foot processies cause proteinuria? And what else can it cause?

Podocyte foot process effacement

proteinuria: loss of filtration lead to an increased permeability (loss of electric potential)

What is the electrokinectic model?

This concepts turns the glomerular filter from a passive into an active and dynamic filter, with a self-clearing mechanism and variable size and charge selectivity.

  • no clogging of the filter
  • it allows negative charged growth factors to travel from podocyte to endothelial cells i.e. VEGF
  • effacement of the foot processes wil disturb the flow through the filter and thus the electrokinetic effects

Focal segmental glomerulosclerosis (FSGS)

The role of parietal epithelial cells (PECs)

How is the role of PECs in focal segmental glomerulosclerosis studied?

With immunological stainings, why?
  • complex anatomy of the kidney
  • focal and segmental aspects of the disease
  • co-staining of multiple markers

What are three possible problems with immunological staining that one should keep in mind?

Marker specificity
  • many markers are less specific as mentioned in literature
  • specificity may change due to cell change in for instance pathological processes
Cross-reactivity between species
  • e.g. High resemblance between immunoglobulins form mouse and rat. This may and lead to cross-reactivity when using both rat and mouse antibodies.
Antibodies need different sample preparations
  • e.g. Cryo-section or paraffin section, fixative, antigen retrieval

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