Peripheral sensory receptor

Peripheral sensory receptors are specialized molecular structures and nerve endings located on the distal terminals of primary afferent neurons that convert environmental stimuli into electrical signals. This broad category encompasses various classes of receptors, including mechanoreceptors, thermoreceptors, and nociceptors, which utilize specific proteins such as transient receptor potential (TRP) channels, voltage-gated sodium channels (Nav), and mechanosensitive Piezo channels (StatPearls, 2023). These receptors are fundamental to the somatosensory system, enabling the perception of touch, pressure, temperature, and noxious stimuli (Julius & Basbaum, 2001). In pathological conditions, particularly chronic and neuropathic pain, these receptors often become hypersensitized or exhibit maladaptive spontaneous activity, leading to clinical symptoms like allodynia and hyperalgesia (Costigan et al., 2009). Pharmacological modulation of these receptors, such as through the use of local anesthetics to block sodium channels or topical agonists to desensitize TRP channels, is a primary strategy for managing localized pain and sensory disorders. However, achieving therapeutic selectivity remains a challenge to avoid the loss of essential protective sensations or the induction of systemic side effects.

Other names

Somatosensory receptorSensory nerve endingPeripheral nociceptorCutaneous receptorMechanoreceptorThermoreceptor

Drugs targeting peripheral sensory receptors primarily act by inhibiting voltage-gated sodium channels to block action potential propagation, or by modulating transient receptor potential (TRP) channels to alter sensory transduction and induce desensitization (StatPearls, 2023; Julius & Basbaum, 2001).