دورية أكاديمية
A277 A NOVEL PH-SENSITIVE Μ-OPIOID RECEPTOR AGONIST THAT DOES NOT INDUCE TOLERANCE IN A COLITIS MOUSE MODEL
| العنوان: | A277 A NOVEL PH-SENSITIVE Μ-OPIOID RECEPTOR AGONIST THAT DOES NOT INDUCE TOLERANCE IN A COLITIS MOUSE MODEL |
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| المؤلفون: | Degro, C E, Jiménez-Vargas, N N, Schincariol, H M, Tsang, Q K, Guzman-Rodriguez, M, Lomax, A E, Reed, D E, Stein, C, Bunnett, N W, Vanner, S J |
| المصدر: | Journal of the Canadian Association of Gastroenterology ; volume 6, issue Supplement_1, page 90-91 ; ISSN 2515-2084 2515-2092 |
| بيانات النشر: | Oxford University Press (OUP) |
| سنة النشر: | 2023 |
| الوصف: | Background Adequate pain control in inflammatory bowel disease (IBD) can require opioids due to their high analgesic potency. The long-term use of opioids, however, is limited by the development of tolerance. This leads to reduced analgesic efficacy over time, resulting in escalating opioid dosing and thus increased risk of serious side effects. We previously demonstrated the safety and effectiveness of a novel pH-sensitive µ-opioid receptor (MOR) agonist, NFEPP, in a murine colitis pain model, but its tolerance potential with chronic administration is unknown. Purpose To assess the tolerance potential of NFEPP compared to its parent compound fentanyl during acute colitis in a preclinical mouse model. Method Acute colitis in C57BL/6 mice was induced using 2.5% dextran sulphate sodium for 5 days. NFEPP or fentanyl were then administered s.c. every 4 hours between 7am and 11pm over 5 days in daily increasing concentrations (0.4-1.5 mg/kg/d). Analgesic tolerance to opioids was assessed in conscious mice by measuring visceromotor responses (VMRs) to noxious colorectal distensions. Tolerance to the MOR agonist DAMGO in NFEPP or fentanyl treated mice was evaluated using patch-clamp recordings from dorsal root ganglion (DRG) neurons and extracellular recordings from lumbar splanchnic nerves that innervate the colon. Inflammation was assessed by macroscopic analyses, histological scoring and tissue-pH measurements of the inflamed colon. Group differences were analyzed using two-way ANOVA with Bonferroni′s or Tukey′s post-test (p-value <0.05). Result(s) NFEPP significantly reduced VMRs before and after chronic NFEPP treatment (39% reduction, p<0.05 vs. 41% reduction, p<0.05, compared to baseline at 80 µl). No differences of NFEPP induced antinociceptive actions were observed comparing VMR measurements before and after chronic administration (p=0.44). However, the analgesic activity of fentanyl decreased over time with less VMR inhibition observed after chronic treatment compared to fentanyl ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1093/jcag/gwac036.277 |
| الإتاحة: | https://doi.org/10.1093/jcag/gwac036.277Test https://academic.oup.com/jcag/article-pdf/6/Supplement_1/90/49441282/gwac036.277.pdfTest |
| حقوق: | https://creativecommons.org/licenses/by/4.0Test/ |
| رقم الانضمام: | edsbas.8C368C8D |
| قاعدة البيانات: | BASE |
| DOI: | 10.1093/jcag/gwac036.277 |
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