Immunological Consequences Of Senescence In Physiology And Pathology
Our bodies contain cells that, when stressed or damaged, can enter a state called “senescence.” In this state, cells stop dividing permanently but remain active, releasing a unique cocktail of molecules known as the senescence-associated secretory phenotype (SASP). This SASP profoundly influences the immune system, acting as a double-edged sword.
In healthy, younger individuals, this process is often beneficial. Senescent cells signal to the immune system, which then efficiently clears them away. This clearance is crucial for processes like embryonic development, repairing damaged tissues, and even suppressing the formation of tumors. It’s a vital cleanup mechanism that helps maintain our body’s balance.
However, as we age or develop chronic diseases, our immune system’s ability to detect and remove these senescent cells can decline. When senescent cells accumulate and persist, their continuous release of SASP can lead to chronic inflammation throughout the body. This persistent inflammation is a major driver of many age-related problems, including tissue scarring (fibrosis), metabolic disorders, the progression of cancer, and impaired tissue repair. Furthermore, immune cells themselves can become senescent, creating a vicious cycle where the immune system becomes less effective at its job, further contributing to the buildup of senescent cells and worsening inflammation.
Understanding this intricate interplay between senescent cells and the immune system is opening new avenues for developing treatments. By targeting these senescent cells or modulating how they interact with our immune defenses, scientists hope to combat age-related diseases and improve overall health.
Source: link to paper