Meta-environment No5: red bone marrow is a distributed organ of hematopoiesis and systemic immune regulation

Red bone marrow is traditionally considered in anatomy as a tissue located inside bones, the function of which is reduced to the production of blood cells. However, modern research shows that the bone marrow is a complex, dynamic and distributed system – the hematopoietic niche, which not only generates all blood cells throughout life, but also actively regulates immune homeostasis, interacts with bone tissue, participates in systemic inflammation and is a central link in the aging processes of the body. Bone marrow contains hematopoietic stem cells (HSCs), mesenchymal stromal cells (MSCs), osteoblasts, endothelial cells, adipocytes, and immune cells, which form a complex network of cell-to-cell interactions. The bone marrow niche is not a passive scaffold – it actively regulates the self-renewal, differentiation, and migration of the HSC through three main mechanisms: cell-to-cell communication, cell adhesion, and extracellular matrix remodeling. Bone marrow aging is accompanied by myeloid shift, clonal hematopoiesis, and chronic inflammation ("inflamaging"), which underlies age-related immune dysfunction and an increased risk of cancer. Particular attention is paid to the systemic restoration of the bone marrow within the framework of the Quatotron method - a multimodal physical effect in combination with biogenic nutrition and longevity mechanics, aimed at restoring niche function, reducing inflammation and rejuvenating the hematopoietic system. Understanding the bone marrow as a meta-environment No5 opens up new opportunities for the prevention and treatment of age-related hematological disorders, immunodeficiencies and systemic diseases.