Stromal Cell Senescence Augments Haematopoietic Cell Fitness In Clonal Haematopoiesis
As we age, our bodies undergo many changes, and sometimes these changes can increase our risk for certain diseases. One such condition is called clonal hematopoiesis (CH), where some of our blood stem cells acquire mutations and start to outcompete healthy blood cells, increasing the risk of developing blood cancers like leukemia.
Recent research has shed light on a surprising factor contributing to this process: the “neighborhood” where blood stem cells live, known as the bone marrow microenvironment. This environment is made up of various cells, including mesenchymal stromal cells (MSCs), which are crucial for supporting blood cell production.
The study found that the mutant blood cells in CH actually cause these MSCs to enter a state called “senescence.” Senescent cells are often referred to as “zombie cells” because they stop dividing but remain active, secreting various factors that can influence their surroundings. In this case, these senescent MSCs release signals that, instead of being harmful, actually boost the fitness and survival of the pre-malignant blood cells. This creates a self-reinforcing cycle where the mutant cells encourage their environment to become more hospitable, further promoting their growth and potentially leading to the development of blood cancers.
Understanding this intricate crosstalk between the mutant blood cells and their surrounding stromal cells opens up exciting new possibilities. By targeting and removing these senescent stromal cells, or by disrupting the signals they send, we might be able to prevent or delay the progression of clonal hematopoiesis to more serious blood disorders. This research highlights the importance of the cellular neighborhood in disease development and offers a potential new strategy for cancer prevention.
Source: link to paper