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Beta-endorphin in experimental canine spinal ischemia.
P L De Riu1, V Petruzzi, G Palmieri
1Department of Neurological Rehabilitation, University of Turin, Italy.
Stroke
|February 1, 1989
Summary
Spinal cord ischemia in dogs increased cerebrospinal fluid beta-endorphin but not plasma levels. This suggests different origins for beta-endorphin in plasma and cerebrospinal fluid, potentially linked to nervous tissue damage.
Area of Science:
- Neuroscience
- Endocrinology
- Physiology
Background:
- Beta-endorphin is a key endogenous opioid peptide involved in stress response and pain modulation.
- Investigating beta-endorphin levels in cerebrospinal fluid (CSF) and plasma can provide insights into its physiological origins and roles.
- Spinal cord ischemia is a critical condition that may affect neurochemical signaling.
Purpose of the Study:
- To investigate the changes in plasma and cerebrospinal fluid (CSF) beta-endorphin concentrations during spinal cord ischemia.
- To differentiate the sources of beta-endorphin in plasma versus CSF under ischemic conditions.
Main Methods:
- Radioimmunoassay was used to measure beta-endorphin concentrations.
- Dogs underwent infrarenal aortic ligature to induce spinal cord ischemia.
- Control dogs were subjected to sham surgery.
Main Results:
- Plasma beta-endorphin levels significantly increased in control dogs due to surgical stress.
- Spinal cord ischemia did not significantly affect plasma beta-endorphin levels.
- Cerebrospinal fluid (CSF) beta-endorphin concentration significantly increased following spinal cord ischemia.
- Surgical stress alone did not significantly alter CSF beta-endorphin levels.
Conclusions:
- Plasma and CSF beta-endorphin likely originate from different sources.
- The hypophysis is a probable source for plasma beta-endorphin, influenced by general stress.
- Nervous tissue is a likely source for CSF beta-endorphin, responding to ischemic injury.