The antinociceptive effect of synthetic opioid Tyr-d-Arg-Phe-Sar involved both direct mu-1 receptor activation AND endogenous dynorphin B release at the spinal level — a dual-mechanism analgesic.
Key findingTyr-d-Arg-Phe-Sar analgesia at the spinal level involved both direct mu-1 opioid receptor activation and endogenous dynorphin B release, with anti-dyn
What the researchers found
Tyr-d-Arg-Phe-Sar analgesia at the spinal level involved both direct mu-1 opioid receptor activation and endogenous dynorphin B release, with anti-dynorphin antibodies partially blocking the effect — confirming dual direct + endogenous amplification mechanism.
Why it matters
Relevant for opioid-peptides, pain.
How the study worked
animal-study study on opioid-peptides, pain.
What this study cannot tell us
See abstract.
How to read the evidence
preliminary evidence.
When this study was published
Published in 2006.
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
Contribution of spinal mu(1)-opioid receptors and dynorphin B to the antinociception induced by Tyr-d-Arg-Phe-Sar.
Peptides, 27(11), 2786-93
Citation
Mizoguchi, Hirokazu; Ito, Kanenori; Watanabe, Hiroyuki; Watanabe, Chizuko; Katsuyama, Sou; Fujimura, Tsutomu; Sakurada, Tsukasa; Sakurada, Shinobu. (2006). Contribution of spinal mu(1)-opioid receptors and dynorphin B to the antinociception induced by Tyr-d-Arg-Phe-Sar.. Peptides, 27(11), 2786-93.