Biology Asked on October 22, 2021
Any suggestions are highly appreciated.
The sheep erythrocyte lysis you mention actually involves sensitised erythrocytes, i.e. erythrocytes already coated with antibodies. Antigen-antibody complexes are well-known for their activation of the classical complement pathway.
In fact, rabbit erythrocytes coated with antibodies also activate the classical complement pathway$^1$. Thus, sheep erythrocytes are not special in this regard.
The difference comes when we incubate only erythrocytes—devoid of any sensitising antibodies—with serum containing complement factors. In this situation, erythrocytes from the rabbit, but not those from the sheep, are lysed by alternate complement activation. Why is there such a difference?
Fearon and Austen$^2$ showed that this is due to a protective effect of the rabbit erythrocyte membrane on C3b. Normally, C3b is inhibited by factor I and factor H in serum. This effect is lost with rabbit (but not sheep) erythrocytes, which explains the difference in complement-mediated lysis.
Journal articles cited:
Answered by Adhish on October 22, 2021
The complement system is an innate immune response which has three pathways - as shown in the image below.
The breakdown of red blood cells assesses the functional capacity of the complement system. This experiment is titled: "Total complement activity", "CH50" or "CH100". Is this what you're referencing?
Hemolysis of sheep red blood cells occurs via the classical complement pathway.
More information: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4360204/
Answered by Andrew on October 22, 2021
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