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. 1988 Jan 15;249(2):495–500. doi: 10.1042/bj2490495

Antibody-independent activation of the complement system by mitochondria is mediated by cardiolipin.

M C Peitsch 1, J Tschopp 1, A Kress 1, H Isliker 1
PMCID: PMC1148730  PMID: 3277626

Abstract

Non-immune activation of the first component of complement (C1) by the heart mitochondrial inner membrane has been investigated. Cardiolipin, the only strong activator of C1 among phospholipids, is present in large amounts in the heart mitochondrial inner membrane. We therefore studied its contribution to C1 activation by mitochondria. The proteins of the mitochondrial inner membrane were found to activate C1 only weakly, in contrast with the phospholipid fraction which induces strong C1 activation. Furthermore, the digestion of mitochondrial inner membranes with proteolytic enzymes did not affect C1 activation. Additional support in favour of cardiolipin being the responsible activator came from competition experiments with mitochondrial creatine kinase (mt-CPK) and adriamycin, known to bind to cardiolipin. Both mt-CPK and adriamycin displaced C1q from the mitochondrial inner membrane. In addition, C1q displaced mt-CPK bound to mitoplasts.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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