Cellular Senescence In Blood Cells: A Link Between Metabolic Syndrome, Inflammaging And Cardiometabolic Disease
Our bodies are complex, and sometimes, the very cells that keep us healthy can contribute to disease as they age. This is the case with “cellular senescence,” a process where cells stop dividing but remain active, often releasing inflammatory signals. While we’ve known that senescent cells accumulate in tissues and contribute to age-related conditions like heart disease and diabetes, recent research sheds light on the crucial role of these aging cells within our blood.
Metabolic syndrome, a cluster of conditions including obesity, insulin resistance, high blood pressure, and unhealthy cholesterol levels, is a growing health concern. It’s often accompanied by a state of chronic, low-grade inflammation. This new understanding suggests that senescent blood cells are a key link in this chain, connecting metabolic stress to this persistent inflammation and ultimately to the development of serious heart and metabolic conditions.
These aging blood cells, including those that originate from our bone marrow (hematopoietic stem cells) and those circulating throughout our body, can disrupt normal immune function and tissue health. They essentially become “bad actors,” secreting molecules that promote inflammation and damage, a phenomenon known as the senescence-associated secretory phenotype (SASP). This continuous inflammatory state can worsen metabolic problems and accelerate the progression of diseases affecting the heart and blood vessels.
Factors like high blood sugar, unhealthy fats, and oxidative stress (an imbalance between free radicals and antioxidants) can all trigger this cellular aging process in blood cells. Understanding this connection opens up new avenues for potential treatments, focusing on either removing these senescent cells or blocking their harmful secretions to combat metabolic syndrome and related cardiometabolic diseases.
Source: link to paper