Futurity · Health

Protein Linked to Inflammation Has Protective Role in Aging

Researchers have discovered that the protein cGAS, known for triggering inflammation, also plays a crucial protective role in aging. Contrary to expectations, removing this protein worsened aging in mice.

Scientists initially hypothesized that inhibiting cGAS might slow aging due to its role in inflammation. However, experiments showed that mice lacking cGAS became frailer, experienced increased inflammation, and had reduced lifespans.

The protein cGAS has a dual function: it can initiate inflammation when detecting DNA outside the cell nucleus, but it also helps prevent chronic inflammation associated with aging by maintaining chromatin structure within the nucleus.

This internal nuclear function of cGAS involves keeping DNA tightly packed, which suppresses the activity of genetic elements called LINE1s. When cGAS is absent, LINE1s become more active, leading to increased DNA in the cytoplasm that can trigger an inflammatory response.

Inflammation is a natural immune response that, when persistent, can damage cells and is linked to age-related diseases. LINE1s are transposable elements that can become active with age, contributing to chronic inflammation.

The new findings suggest that while cGAS can activate inflammation, it also acts as a defense against other inflammatory triggers originating from within the cell's own DNA.

These results complicate therapeutic strategies aimed at blocking cGAS to combat age-related inflammation. Future treatments may need to selectively preserve cGAS's protective nuclear function while inhibiting its inflammatory activity elsewhere.

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