Cipro’s side effects appear to come from mitochondrial DNA interactions

A study carried out at the University of Eastern Finland and published in Nucleic Acids Researchinvestigated the effect of ciprofloxacin on mitochondria, the important cell organelles in our body that produce the energy for cellular function.

Mitochondria possess their own small circular genome, which requires topoisomerase enzymes for its maintenance. Topoisomerases regulate the topology of DNA and untangle for instance knots and overwound stretches of a genome by cutting and reconnecting the DNA sequence.

While fluoroquinolones are designed to inhibit the bacterial topoisomerase gyrase, which leads to the death of the bacterium, they also inhibit the topoisomerase 2 of our own cells.

“We noticed that topoisomerase 2 is especially important in the replication of the mitochondrial genome, as it regulates the winding of this small DNA molecule by removing positive twists,” Academy Research Fellow Steffi Goffart from the University of Eastern Finland says.

Ciprofloxacin stopped this normal maintenance and transcription of mitochondrial DNA by changing mtDNA topology, causing impaired mitochondrial energy production and blocking cellular growth and differentiation.

This dramatic impact on mitochondrial DNA is the likely cause for most negative side effects experienced by patients, and also a reason to use fluoroquinolone antibiotics with great caution.

IMAGE SOURCE: Creative Commons

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