Antinociceptive effects of AS1892802, a novel Rho kinase inhibitor, in rat models of inflammatory and noninflammatory arthritis.

Abstract

Rho kinase (ROCK) is involved in various physiological functions, including cell motility, vasoconstriction, and neurite extension. Although a functional role of ROCK in nociception in the central nervous tissue has been reported in neuropathy, the peripheral function of this protein in hyperalgesia is not known. In this study, antinociceptive effects of AS1892802 [1-[(1S)-2-hydroxy-1-phenylethyl]-3-[4-(pyridin-4-yl)phenyl]urea], a novel and highly selective ROCK inhibitor, were investigated in two rat models of arthritis. Orally administered AS1892802 exhibited potent antinociceptive effect in both an adjuvant-induced arthritis (AIA) model (inflammatory arthritis model) and a monoiodoacetate-induced arthritis (MIA) model (noninflammatory arthritis model), with an ED(50) of 0.15 mg/kg (MIA model). Fasudil, a ROCK inhibitor, and tramadol were also effective in both models; however, diclofenac was effective only in the AIA model. The onset of antinociceptive effect of AS1892802 was as fast as those of tramadol and diclofenac. AS1892802 did not induce gastric irritation or abnormal behavior. Because AS1892802 rarely penetrates the central nervous tissue and is also effective by intra-articular administration, it seemed to function peripherally. These results suggest that AS1892802 has an attractive analgesic profile for the treatment of severe osteoarthritis pain.

• Authors: Eiji Yoshimi, Fumiyo Kumakura, Chie Hatori, Emi Hamachi, Akinori Iwashita, Noe Ishii, Takeshi Terasawa, Yasuaki Shimizu, Nobuaki Takeshita
• Journal: The Journal of pharmacology and experimental therapeutics (J Pharmacol Exp Ther) Vol. 334 Issue 3 Pg. 955-63 (Sep 01 2010) ISSN: 1521-0103 [Electronic] United States
• PMID: 20534789 (Publication Type: Journal Article)

Chemical References

• 1-(2-hydroxy-1-phenylethyl)-3-(4-(pyridin-4-yl)phenyl)urea
• Analgesics
• Analgesics, Opioid
• Anti-Inflammatory Agents, Non-Steroidal
• Enzyme Inhibitors
• Iodoacetates
• Phenylurea Compounds
• Pyridines
• Diclofenac
• Tramadol
• 1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine
• Freund's Adjuvant
• rho-Associated Kinases
• Dinoprostone
• fasudil

Topics

• 1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine (analogs & derivatives, pharmacology)
• Analgesics
• Analgesics, Opioid (pharmacology)
• Animals
• Anti-Inflammatory Agents, Non-Steroidal (pharmacology)
• Arthritis, Experimental (chemically induced, drug therapy, pathology)
• Behavior, Animal (drug effects)
• Blood Pressure (drug effects)
• Chronic Disease
• Diclofenac (pharmacology)
• Dinoprostone
• Enzyme Inhibitors (pharmacology)
• Freund's Adjuvant
• Inflammation (chemically induced, pathology)
• Iodoacetates
• Male
• Motor Activity (drug effects)
• Phenylurea Compounds (pharmacology)
• Pyridines (pharmacology)
• Rats
• Rats, Sprague-Dawley
• Stomach Ulcer (chemically induced, pathology)
• Tramadol (pharmacology)
• rho-Associated Kinases (antagonists & inhibitors)