Body's new warning system 'sprays' DNA to alert other cells

A previously unknown warning system that contributes to the body’s has been discovered.

According to the researchers, Mitochondria in the white blood cells secrete a web of fibres that raises the alarm.

The may lead to increased knowledge about and

White blood cells are major components of the body’s immune defence, and the research group has shown that several types of these cells react against small fragments that are similar to the from bacteria and viruses.

The white blood cells spray out a web consisting of mitochondrial (mtDNA) strands. Mitochondria are present in all cells and normally produce the needed by the cell, by burning sugar and fat to form water and carbon dioxide.

The web that the mitochondria release sends signals to the surrounding cells that the body is under attack, and cause other white blood cells to release a signal substance known as “interferon type 1”. This substance helps the to combat the

“We show that the white blood cells in the can release mtDNA outside the cells in an active process in response to such as bacteria and viruses. The discovery raises the possibility of further studies in which we will try to reduce the release of mtDNA, and in this way reduce the that it causes”, explained

Other types of web formed by white blood cells in the (known as “neutrophils”) have been previously known.

These cells release meshes coated with antibacterial proteins. However, the formation of the newly discovered mtDNA webs differs fundamentally from that of the other types of web. The researchers have shown that the mtDNA webs are activated within a couple of minutes, which is faster than the neutrophil-based meshes. The latter also lack the signal function that the mtDNA webs have. Further, the mtDNA webs survive in the blood longer before being dissolved.

High levels of interferon type 1, the signal substance activated by the mtDNA webs, occur in and several types of The researchers believe that it may be possible to quantify the secreted mtDNA molecules and interpret the warning signals, and in this way understand these better.

The have been published in the scientific journal PNAS.

(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)

First Published: Sat, January 13 2018. 04:04 IST

Source: Health – Google News

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