Immunology Under Gravito–Thermal Constraint Regimes

Abstract

Modern immunology has traditionally interpreted immune function through molecular signalling networks, genetic regulation, cellular interactions, and host-pathogen dynamics. However, immune processes operate within complex physical environments characterized by fluid transport, hydrostatic gradients, thermodynamic regulation, tissue mechanics, and mass-dependent biological organization. The present article introduces a conceptual framework termed Gravito-Thermal Immunodynamics (GTI), in which immunity is examined as a dynamic biological system emerging from interactions between molecular regulation and physical organization across multiple levels of biological complexity. Within this framework, blood circulation, lymphatic transport, hematopoietic organization, cerebrospinal fluid dynamics, inflammatory responses, oedema formation, leukocyte trafficking, and immune surveillance are interpreted as processes influenced by coupled hydrostatic, thermal, osmotic, biomechanical, and gravitational conditions. Immune tissues are viewed not solely as biochemical organs but as active fluid-mediated and poroelastic architectures operating within continuously evolving physical microenvironments. The framework integrates concepts from immunology, fluid mechanics, thermodynamics, mechanobiology, vascular physiology, neurobiology, and systems biology. Inflammation, fever, neuroimmune regulation, cancer-associated immune remodelling, embryonic immune development, immune aging, and immune adaptation under microgravity are reconsidered within broader gravito-thermal and hydro-mechanical contexts. Observations from spaceflight research, glymphatic physiology, tumour biomechanics, lymphatic biology, and developmental systems further support the importance of physical organization in immune function. Gravito-Thermal Immunodynamics does not seek to replace established molecular immunology. Rather, it proposes a complementary physical layer through which immune organization may be interpreted and investigated. By integrating biological signalling with fluid transport, thermodynamic processes, tissue mechanics, and gravity-dependent physiological organization, the framework offers a systems-level perspective that may stimulate interdisciplinary research into the physical foundations of immunity under both terrestrial and extraterrestrial conditions.