Endomorphin-2's brain-level (supraspinal) analgesia was partly mediated by dynorphin A release through mu-1 opioid receptors, confirming the two endomorphins use different descending pain pathways.
Key findingSupraspinal endomorphin-2 antinociception involved dynorphin A release mediated by mu-1 receptors in the brain, with anti-dynorphin antibodies partial
What the researchers found
Supraspinal endomorphin-2 antinociception involved dynorphin A release mediated by mu-1 receptors in the brain, with anti-dynorphin antibodies partially blocking the effect — confirming endomorphin-2's unique dual-pathway (mu + dynorphin) analgesic mechanism.
Why it matters
Relevant for opioid-peptides, pain, neuropeptides.
How the study worked
animal-study study.
What this study cannot tell us
See abstract.
How to read the evidence
preliminary evidence.
When this study was published
Published in 2008.
The bigger picture
Advances peptide research.
Questions still open
- Further research needed.
- Clinical translation to evaluate.
Common questions
What was studied?
What was found?
Read the original research
Possible involvement of dynorphin A release via mu1-opioid receptor on supraspinal antinociception of endomorphin-2.
Peptides, 29(9), 1554-60
Citation
Sakurada, Shinobu; Sawai, Toshiki; Mizoguchi, Hirokazu; Watanabe, Hiroyuki; Watanabe, Chizuko; Yonezawa, Akihiko; Morimoto, Masaya; Sato, Takumi; Komatsu, Takaaki; Sakurada, Tsukasa. (2008). Possible involvement of dynorphin A release via mu1-opioid receptor on supraspinal antinociception of endomorphin-2.. Peptides, 29(9), 1554-60. https://doi.org/10.1016/j.peptides.2008.04.012