June 8th, 2026
Nucleic acids such as DNA and RNA should in the normal course of events largely remain localized within the cell nucleus and mitochondria, the locations of the nuclear genome and mitochondrial genomes respectively. Changes that take place with age disrupt everything, however, and this disruption includes the mislocalization of DNA and RNA fragments into the body of the cell. One of the many lines of defense against infectious pathogens such as viruses and bacteria deployed by cells takes the form of sensor proteins that detect inappropriate DNA and RNA in the cytosol of the cell, and then trigger inflammatory signaling and potentially even cell death. Thus a sizable portion of the chronic inflammation characteristic of later life is a maladaptive reaction to some aspects of the poor state of structural organization within aged cells.
Today's open access paper reviews these mechanisms, with a particular emphasis on the connection between age-related chronic inflammation and increased tendency towards an inappropriate coagulation response in the aging vasculature, the cause of thrombosis. An important facet of present research into immune aging is the effort to find ways to interfere in chronic inflammatory signaling without disabling necessary inflammatory responses. This has so far proven to be challenging, as all inflammation runs through much the same triggers and regulatory systems. The only alternative is to remove the underlying damage of aging that causes maladaptive inflammatory responses, but at present that is not the primary focus of the research community.
