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[Morphine decreased the content of cyclic AMP in the rat spinal cord]
Abstract:
It has been reported that morphine or opiate-like substances (OLS) can affect the contents of cyclic AMP and/or cyclic GMP in mammalian brain, but very little is known whether similar effects also occur in spinal cord. Using RIA method, we showed that morphine significantly decreased the content of cyclic AMP in the rat spinal cord in vivo and in vitro and this effect could be completely blocked by naloxone, while the concentration of cyclic GMP in rat spinal cord is unchanged. In view of the present experiment it is suggested that the changes of cyclic AMP in the central nervous system may be partly mediated by the action of morphine.
Insights
Morphine significantly reduces cyclic AMP levels in the rat spinal cord, an effect blocked by naloxone. Cyclic GMP levels remained unchanged, suggesting morphine
Area of Science:
- Neuroscience
- Pharmacology
Context:
- Opiate-like substances (OLS) are known to affect cyclic nucleotide levels in the mammalian brain.
- Limited research exists on the effects of OLS on cyclic nucleotide concentrations within the spinal cord.
Purpose:
- To investigate the impact of morphine on cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) levels in the rat spinal cord.
- To determine if morphine's effects on spinal cord cyclic nucleotides are modulated by naloxone.
Summary:
- Morphine administration in rats led to a significant decrease in spinal cord cAMP levels, both in vivo and in vitro.
- This reduction in cAMP by morphine was completely antagonized by naloxone.
- Spinal cord cGMP concentrations were not significantly altered by morphine.
Impact:
- These findings suggest that morphine's action on the central nervous system may involve alterations in cAMP levels within the spinal cord.
- The study highlights the role of cAMP signaling in the spinal cord's response to opioid substances.