Local Injection of Endothelin-1 Produces Pain-Like Behavior and Excitation of Nociceptors in Rats

• Published in: The Journal of neuroscience 2001-07, Vol.21 (14), p.5358-5366
• Main Authors: Gokin, Alexander P, Fareed, Moin U, Pan, Hui-Lin, Hans, Guy, Strichartz, Gary R, Davar, Gudarz
• Format: Article
• Language: English
• Subjects: Action Potentials - drug effects; Animals; Behavior, Animal - drug effects; Dose-Response Relationship, Drug; Endothelin Receptor Antagonists; Endothelin-1 - administration & dosage; Hindlimb - drug effects; Hindlimb - innervation; Injections, Subcutaneous; Male; Nerve Fibers - drug effects; Nerve Fibers, Myelinated - drug effects; Neurons, Afferent - drug effects; Nociceptors - drug effects; Nociceptors - physiopathology; Pain - chemically induced; Pain - physiopathology; Pain Measurement - drug effects; Peptides, Cyclic - administration & dosage; Rats; Rats, Sprague-Dawley; Reaction Time - drug effects; Receptor, Endothelin A; Sciatic Nerve
• ISSN: 0270-6474; 1529-2401
• DOI: 10.1523/jneurosci.21-14-05358.2001

Neurobehavioral and neurophysiological actions of the peptide endothelin-1 (ET-1) were investigated after subcutaneous plantar hindpaw injections in adult male Sprague Dawley rats. Hindpaw flinching developed within minutes after ET-1 (8-16 nmol) injection, peaked at 30 min, lasted for 60 min, and was strongly inhibited by the endothelin-A (ET(A)) receptor antagonist, BQ-123 (3.2 m). In separate experiments, impulse activity of single, physiologically characterized sensory C-, Adelta-, and Abeta-fibers was recorded from the sciatic nerve in anesthetized rats after subcutaneous injections of endothelin-1 (1-20 nmol), alone or together with BQ-123 (3.2 m), into the plantar hindpaw receptive fields of these units. All nociceptive C-fibers (31 of 33 C-fibers studied) were excited by ET-1 (1-20 nmol) in a dose-dependent manner. For doses of 16-20 nmol, the mean latency for afferent activation after injection of ET-1 was 3.16 +/- 0.31 min, and the mean and maximum response frequency were 2.02 +/- 0.48 impulses (imp)/sec and 14.0 +/- 3.2 imp/sec, respectively. All 10 nociceptive Adelta-fibers (of 12 Adelta-fibers studied) also responded to 1-20 nmol of ET-1 in a dose-dependent manner with a mean latency of 3.5 +/- 0.12 min and mean response frequency of 3.3 +/- 2.3 imp/sec. In contrast, most Abeta-fibers (9 of 12) did not respond to ET-1. BQ-123, when coinjected with ET-1, blocked ET-1-induced activation in all C- and Adelta-fibers tested. These data demonstrate that subcutaneous administration of ET-1 to the rat plantar hindpaw produces pain-like behavior and selective excitation of nociceptive fibers through activation of ET(A) receptors.