Indtoduction - PAM

8 important questions on Indtoduction - PAM

For which 3 reasons is malaria a problem for pregnant women?

1. Pregnant women are bitten far more
2. Their immune system goes down during oregnancy
3. Parasites accumulate in the placenta

Why is an infection problematic for the mother and baby?

1. The parasites release new merozoites --> new RBC are infected --> aneamia
2. Immune system active --> inflammation placenta --> damage of placenta membrane --> preterm delivery & growth retardation

How does cytoadhesion or iRBC work?

Parasite puts PfEMP1 on iRBC surface -> PfEMP1 binds to host receptor CD36 of organs and CSA in placenta
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How can the cytoadhesion be reduced?

CSA based therapies:
1. Administration of soluble CSA, but severe nephrotoxic
2. Administration of chondriotinase AC
3. Therapeutic use of monoclonal antibodies against CSA

PfEMP1 based:
1. Block PfEMP1 adhesion
2. Vaccine

Why is it difficult to make a malaria vaccine?

1. Antigenic variation by switching var genes, only 1 expressed at a time
2. PfEMP1 had both intra- and extracellular domain, also different domains for different receptors
3. 60 copies of PfEMP1 in genome

What can be stated about parity?

1. Placental parasitemia decreases with parity
2. Adaptive immune system is involved: more pregnancies -> more antibodies against PfEMP1 -> no antigenic variation in PfEMP1 when the parasite needs to bind to CSA

What is the aim of a VAR2CSA based vaccine?

1. Share epitopes among VAR2CSA of different parasite isolates
2. To induce antibodies that prevent binding of iRBC to CSA

Which insights were gaines in the vaccine development?

1. No longterm protection
2. You need full-length VAR2CSA to get good antibody response

The question on the page originate from the summary of the following study material:

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