Meta-Environment No15: Innate Immune System

The innate immune system has long been seen in immunology as a "primitive" first line of defense—a crude, non-specific response devoid of memory and selectivity, in contrast to "advanced" adaptive immunity. However, modern research has radically revised this idea. Innate immunity is a complex, evolutionarily ancient, body-wide network of cells, proteins, and signaling molecules that not only provides immediate protection against pathogens, but also actively regulates systemic inflammation, tissue homeostasis, regeneration, and interactions with the adaptive immune system, microbiota, and other meta-environments. This system is the only defense mechanism in invertebrates and plants and has retained its fundamental role in all multicellular organisms. The innate immune system includes a distributed network of phagocytic cells (macrophages, neutrophils, dendritic cells), cytotoxic effectors (NK cells), complement system, antimicrobial peptides, and numerous pattern-recognizing receptors (PRRs), including Toll-like receptors (TLRs), NOD-like receptors (NLRs), and RIG-I-like receptors (RLRs). These components are distributed throughout the body—in the blood, lymph, interstitium, mucous membranes, and parenchymal organs—forming an integrated, self-organizing network capable of distributed synchronization. In this article, we argue that the innate immune system is an active meta-environment No15 that meets all four criteria. Particular attention is paid to immunoaging, a progressive deterioration of immune function with age, characterized by numerical expansion, but a functional decline in innate immune cells, impaired phagocytosis, chemotaxis and the formation of neutrophilic extracellular traps (NET), as well as the development of inflaming, a chronic low-intensity inflammation that is a key driver of age-associated diseases. Systemic restoration of innate immunity in the Quatotron method through multimodal physical action aimed at reducing chronic inflammation, restoring the functional activity of immune cells and normalizing immune homeostasis is presented. Understanding the innate immune system as a meta-environment opens up new possibilities for the prevention and treatment of infectious, autoimmune, cancer, and age-related diseases.