Abstract
Activation of the complement system evokes cell damage by insertion of membrane attack complexes, which constitute the basis of the pathogenesis of various haemolytic disorders. Recently, we found that haemolysis caused by other types of membrane pore-forming proteins such as α-haemolysin (HlyA) from Escherichia coli, α-toxin from Staphylococcus aureus and leukotoxin from Aggregatibacter actinomycetemcomitans inflict their cytotoxic effects through P2 receptor activation. Here we show that similar to haemolysis induced by HlyA, leukotoxin and α-toxin, complement-induced haemolysis is amplified through ATP release and subsequent P2 receptor activation. Similar results were found both in murine, sensitised ovine and human erythrocytes, with either human plasma or guinea pig serum as complement donors. Non-selective P2 antagonists (PPADS and suramin) concentration-dependently inhibited complement-induced haemolysis. More specific P2 receptor antagonists imply that P2X1 and P2X7 are the main receptors involved in this response. Moreover, complement activation produces a sustained increase in [Ca2+]i, which initially triggers significant erythrocyte shrinkage, most likely mediated by KCa3.1-dependent K+ efflux. These results indicate that complement, similar to HlyA and α-toxin, requires purinergic signalling for full haemolysis and that activation of erythrocyte volume regulation protracts the process. This finding points to several new pathways to interfere with haemolytic diseases and implies that P2 receptor antagonists potentially can be used to prevent intravascular haemolysis.
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We thank for the skilled technical assistance from Helle Jakobsen and Edith Bjoern Moeller. This project is financially supported by The Danish Medical Research Council, Danish National Research Foundation and The Aarhus University Research Foundation.
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Supplementary figure 1
Preincubation of human erythrocytes with 240 μl ml−1 guinea pig serum and 80 μl ml−1 purified guinea pig complement for 0, 10 and 15 minutes. After preincubation the samples where washed and incubated with 300 μM suramin for the remaining of 60 minutes. The graph illustrates the degree of inhibition by suramin by this procedure. (PDF 34 kb)
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Hejl, J.L., Skals, M., Leipziger, J. et al. P2X receptor stimulation amplifies complement-induced haemolysis. Pflugers Arch - Eur J Physiol 465, 529–541 (2013). https://doi.org/10.1007/s00424-012-1174-z
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DOI: https://doi.org/10.1007/s00424-012-1174-z