Related Experiment Videos
THIP analgesia: cross tolerance with morphine.
Life Sciences
|May 9, 1983
Summary
Repeated use of THIP (4,5,6,7-tetrahydroisoxazolo (5,4-c) pyridone-3-ol), a GABA agonist, leads to reduced pain relief in mice. This suggests separate pathways for opiate and GABA agonist analgesia.
Area of Science:
- Neuroscience
- Pharmacology
- Pain Research
Background:
- 4,5,6,7-tetrahydroisoxazolo (5,4-c) pyridone-3-ol (THIP) is a direct GABA receptor agonist with demonstrated antinociceptive effects.
- Understanding the development of tolerance to analgesic drugs is crucial for effective pain management.
Purpose of the Study:
- To investigate whether chronic administration of THIP leads to tolerance in its analgesic effects.
- To explore the relationship between tolerance to GABA agonists and opioid analgesics.
Main Methods:
- Mice were administered THIP repeatedly for up to 21 days.
- Analgesia was assessed using the tail immersion and hot-plate tests.
- Cross-tolerance between THIP and morphine was evaluated.
Main Results:
- A significant reduction in THIP's antinociceptive response was observed between days 3 and 5 of chronic administration.
- Tolerance to THIP also resulted in cross-tolerance to other GABA agonists.
- Animals tolerant to morphine showed reduced responsiveness to THIP, and vice versa.
Conclusions:
- Chronic administration of THIP induces tolerance to its analgesic effects.
- Opioid and GABA agonist analgesia involve separate, yet related, central nervous system pathways.
- These findings highlight the complex interactions between different analgesic mechanisms.