Antinociceptive effects of incarvillateine, a monoterpene alkaloid from Incarvillea sinensis, and possible involvement of the adenosine system.

Abstract

Incarvillea sinensis is a Bignoniaceae plant used to treat rheumatism and relieve pain in traditional Chinese medicine. As a major component of I. sinensis, incarvillateine has shown analgesic activity in mice formalin tests. Using a series of animal models, this study further evaluated the effects of incarvillateine against acute, inflammatory, and neuropathic pain. Incarvillateine (10 or 20 mg/kg, i.p.) dose-dependently attenuated acetic acid-induced writhing, but did not affect thermal threshold in the hot plate test. In a Complete Freund's Adjuvant model, incarvillateine inhibited both thermal hyperalgesia and paw edema, and increased interleukin-1β levels. Additionally, incarvillateine attenuated mechanical allodynia induced by spared nerve injury or paclitaxel, whereas normal mechanical sensation was not affected. Incarvillateine did not affect locomotor activity and time on the rotarod at analgesic doses, and no tolerance was observed after 7 consecutive daily doses. Moreover, incarvillateine-induced antinociception was attenuated by theophylline, 1,3-dipropyl-8-cyclopentylxanthine, and 3,7-dimethyl-1-propargylxanthine, but not naloxone, indicating that the effects of incarvillateine on chronic pain were related to the adenosine system, but not opioid system. These results indicate that incarvillateine is a novel analgesic compound that is effective against inflammatory and neuropathic pain, and that its effects are associated with activation of the adenosine system.

• Authors: Mei-Liang Wang, Gang Yu, Shou-Pu Yi, Feng-Ying Zhang, Zhi-Tong Wang, Bin Huang, Rui-Bin Su, Yan-Xing Jia, Ze-Hui Gong
• Journal: Scientific reports (Sci Rep) Vol. 5 Pg. 16107 (Nov 03 2015) ISSN: 2045-2322 [Electronic] England
• PMID: 26527075 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Alkaloids
• Analgesics
• Antineoplastic Agents, Phytogenic
• Interleukin-1beta
• Monoterpenes
• Xanthines
• incarvillateine
• 3,7-dimethyl-1-propargylxanthine
• Freund's Adjuvant
• 1,3-dipropyl-8-cyclopentylxanthine
• Theophylline
• Adenosine
• Theobromine
• Paclitaxel

Topics

• Adenosine (metabolism)
• Alkaloids (chemistry, pharmacology, therapeutic use)
• Analgesics (chemistry, pharmacology, therapeutic use)
• Animals
• Antineoplastic Agents, Phytogenic (toxicity)
• Bignoniaceae (chemistry, metabolism)
• Disease Models, Animal
• Edema (chemically induced, prevention & control)
• Freund's Adjuvant (chemistry)
• Hyperalgesia (etiology, prevention & control)
• Interleukin-1beta (metabolism)
• Medicine, Chinese Traditional
• Mice
• Monoterpenes (chemistry, pharmacology, therapeutic use)
• Motor Activity (drug effects)
• Paclitaxel (toxicity)
• Pain Measurement (drug effects)
• Theobromine (analogs & derivatives, pharmacology)
• Theophylline (pharmacology)
• Xanthines (pharmacology)