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Ingested bovine amniotic fluid enhances morphine antinociception in rats
J W Corpening1, J C Doerr, M B Kristal
1Behavioral Neuroscience Program, Department of Psychology, Park Hall, State University of New York at Buffalo, Buffalo, NY 14260-4110, USA.
Physiology & Behavior
|September 9, 2000
Summary
Ingesting bovine amniotic fluid (BAF) enhances morphine-induced pain relief in rats. This placental opioid-enhancing factor (POEF) may be conserved across mammalian species, explaining placentophagia.
Area of Science:
- Neuroscience
- Pharmacology
- Reproductive Biology
Background:
- Placenta and amniotic fluid ingestion enhance opioid-mediated antinociception in rats.
- This effect is attributed to a placental opioid-enhancing factor (POEF).
- POEF's cross-species efficacy suggests evolutionary conservation.
Purpose of the Study:
- To investigate if bovine amniotic fluid (BAF) enhances morphine antinociception in rats.
- To determine if BAF alone produces antinociception.
Main Methods:
- Female Long-Evans rats were administered BAF.
- Morphine antinociception was assessed using the tail-flick test.
- Pain response was measured by the percentage change from baseline tail-flick latency.
Main Results:
- 0.50 mL of BAF significantly enhanced morphine antinociception.
- BAF alone did not produce any antinociceptive effects.
- The enhancement of antinociception was dose-dependent (implied).
Conclusions:
- Bovine amniotic fluid contains an opioid-enhancing factor (POEF) that potentiates morphine's analgesic effects.
- POEF's cross-species efficacy supports its functional and structural conservation during evolution.
- POEF may explain the evolutionary basis of placentophagia, enhancing maternal analgesia without impairing behavior.