Mechanotransduction in the Brain: Soliton Theory, Piezo Receptors and MR Elastography in Headache Pathophysiology

This narrative review aims to explore how incorporating mechanical and thermal dimensions can complement and extend the classical Hodgkin-Huxley (HH) model to enrich the understanding of headache and pain pathophysiology.

This review examines the integration of three distinct concepts with the HH model. (1) Soliton Theory: This theory proposes that nerve impulses also propagate as density waves through the lipid bilayer, accounting for mechanical and thermal phenomena in neural signaling that are not addressed by the HH model. (2) Mechanosensitive Piezo Ion Channels: These channels, which are activated by mechanical stimuli like stretch and pressure, are reviewed for their expression in neurons and glial cells and their recognized involvement in pain and primary and secondary headache disorders, including roles in CGRP release and glial activation. (3) Magnetic Resonance Elastography (MRE): This noninvasive imaging modality, which quantifies brain tissue stiffness, is discussed for its translational potential in headache research by detecting subtle biomechanical changes, for example, associated with neuroinflammation.

Recent insights suggest that mechanical and thermal dimensions contribute significantly to neural function, extending beyond the purely electrochemical focus of the HH model. Soliton theory broadens the HH framework by integrating electromechanical and thermodynamic processes. Piezo channels represent a molecular link between mechanical stimuli and pain signaling pathways relevant to pain. MRE has revealed mechanical alterations in neurological disorders, offering a means to detect biomechanical changes associated with pain and headache-related disorders.

This integrative perspective reframes headache and pain disorders as involving, among other factors, altered brain mechanics. By bridging molecular (Piezo), biophysical (Soliton theory), and imaging (MRE) domains, this framework opens new avenues for diagnosis, biomarker discovery, and therapeutic innovation in pain and headache research.