Systematic Review of Systemic and Neuraxial Effects of Acetaminophen in Preclinical Models of Nociceptive Processing
Hiroshi Hoshijima,1 Matthew Hunt,2 Hiroshi Nagasaka,1 Tony Yaksh2 1Department of Anesthesiology, Saitama Medical University Hospital, Saitama, Japan; 2Departments of Anesthesiology and Pharmacology, University of California, San Diego Anesthesia Research Laboratory, La Jolla, CA, USACorrespondence:...
Guardado en:
| Autores principales: | , , , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Dove Medical Press
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/0a274b111ac04f29b863f73f08b09130 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| Sumario: | Hiroshi Hoshijima,1 Matthew Hunt,2 Hiroshi Nagasaka,1 Tony Yaksh2 1Department of Anesthesiology, Saitama Medical University Hospital, Saitama, Japan; 2Departments of Anesthesiology and Pharmacology, University of California, San Diego Anesthesia Research Laboratory, La Jolla, CA, USACorrespondence: Tony YakshDepartments of Anesthesiology and Pharmacology, University of California, San Diego Anesthesia Research Laboratory 0818, 9500 Gilman Dr., La Jolla, CA, 92093, USATel +1 619-543-3597Fax +1 619-543-6070Email tyaksh@health.ucsd.eduAbstract: Acetaminophen (APAP) in humans has robust effects with a high therapeutic index in altering postoperative and inflammatory pain states in clinical and experimental pain paradigms with no known abuse potential. This review considers the literature reflecting the preclinical actions of acetaminophen in a variety of pain models. Significant observations arising from this review are as follows: 1) acetaminophen has little effect upon acute nociceptive thresholds; 2) acetaminophen robustly reduces facilitated states as generated by mechanical and thermal hyperalgesic end points in mouse and rat models of carrageenan and complete Freund’s adjuvant evoked inflammation; 3) an antihyperalgesic effect is observed in models of facilitated processing with minimal inflammation (eg, phase II intraplantar formalin); and 4) potent anti-hyperpathic effects on the thermal hyperalgesia, mechanical and cold allodynia, allodynic thresholds in rat and mouse models of polyneuropathy and mononeuropathies and bone cancer pain. These results reflect a surprisingly robust drug effect upon a variety of facilitated states that clearly translate into a wide range of efficacy in preclinical models and to important end points in human therapy. The specific systems upon which acetaminophen may act based on targeted delivery suggest both a spinal and a supraspinal action. Review of current targets for this molecule excludes a role of cyclooxygenase inhibitor but includes effects that may be mediated through metabolites acting on the TRPV1 channel, or by effect upon cannabinoid and serotonin signaling. These findings suggest that the mode of action of acetaminophen, a drug with a long therapeutic history of utilization, has surprisingly robust effects on a variety of pain states in clinical patients and in preclinical models with a good therapeutic index, but in spite of its extensive use, its mechanisms of action are yet poorly understood.Keywords: intrathecal, paracetamol, cannabinoid, serotonin, anandamide, analgesia |
|---|