Abstract |
The N-terminal metabolite of the undecapeptide substance P (SP), substance P1-7 (SP1-7), is known to modulate nociception in the central nervous system (CNS) and often has opposite effects from SP. This study investigated the ability of SP(1-7) to modulate the vasodilatation response to SP in anaesthetized rats under different injury conditions using a blister model of inflammation on the hind footpad. The results indicated that SP1-7 inhibited the vascular response to SP in a dose-dependent manner. The putative antagonists naloxone and D-Pro2-D-Phe7-SP1-7 (D-SP1-7) reversed the effect of SP1-7. D-SP1-7 improved the responsiveness to SP under chronic nerve injury, which suggests a role for endogenous SP1-7 in this model. SP1-7 did not inhibit the response to electrical stimulation of the sciatic nerve, which indicates that the heptapeptide interacts at a post-terminal binding site. The current results suggest that SP1-7 may have inhibitory properties in inflammation, analogous to its antinociceptive role in the central nervous system.
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Authors | Daniel Wiktelius, Zeinab Khalil, Fred Nyberg |
Journal | Peptides
(Peptides)
Vol. 27
Issue 6
Pg. 1490-7
(Jun 2006)
ISSN: 0196-9781 [Print] United States |
PMID | 16414148
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Peptides
- Vasodilator Agents
- Substance P
- Naloxone
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Topics |
- Animals
- Central Nervous System
(metabolism)
- Dose-Response Relationship, Drug
- Inflammation
(metabolism)
- Male
- Naloxone
(pharmacology)
- Neurons
(pathology)
- Peptides
(chemistry)
- Protein Structure, Tertiary
- Rats
- Rats, Sprague-Dawley
- Sciatic Nerve
(injuries)
- Substance P
(chemistry, metabolism)
- Vasodilator Agents
(metabolism)
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