2002
DOI: 10.1016/s0014-2999(02)01983-0
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Dissociation of pharmacological pro- and anti-opioid effects by neuropeptide FF analogs

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Cited by 29 publications
(14 citation statements)
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“…Neuropeptide FF (NPFF) is an endogenous opioid-modulating peptide and plays opioid-modulating roles in antinociception, tolerance, and addition. In our previous studies, several multifunctional peptides with opioid/neuropeptide FF receptor agonistic activities, such as EN-9, BN-9 (analog 0 ), and DN-9, were characterized that could produce nontolerant antinociception. Our data showed that 0 simultaneously activated opioid and NPFF receptors and produced potent nontolerance-forming antinociception for 1.5 h after central or peripheral injection. , However, recent pharmacological characterization has shown that 0 could not cross the blood–brain barrier (BBB) . In carrageenan-induced hindpaw inflammation model, the antiallodynic potency of BN-9 after central administration was more potent than that of BN-9 given systemically .…”
Section: Introductionmentioning
confidence: 99%
“…Neuropeptide FF (NPFF) is an endogenous opioid-modulating peptide and plays opioid-modulating roles in antinociception, tolerance, and addition. In our previous studies, several multifunctional peptides with opioid/neuropeptide FF receptor agonistic activities, such as EN-9, BN-9 (analog 0 ), and DN-9, were characterized that could produce nontolerant antinociception. Our data showed that 0 simultaneously activated opioid and NPFF receptors and produced potent nontolerance-forming antinociception for 1.5 h after central or peripheral injection. , However, recent pharmacological characterization has shown that 0 could not cross the blood–brain barrier (BBB) . In carrageenan-induced hindpaw inflammation model, the antiallodynic potency of BN-9 after central administration was more potent than that of BN-9 given systemically .…”
Section: Introductionmentioning
confidence: 99%
“…[21,22]). In mice, the intrathecal injection of 1DMe also potentiates morphine analgesia [64]. Both the antinociception and the potentiation of the morphine-induced analgesia elicited by NPFF analogs are blocked by delta and mu opioid antagonists, suggesting the involvement of these opioid receptor types in mediating the NPFF effects [65][66][67].…”
Section: Painmentioning
confidence: 95%
“…However, it should be noted that other studies have reported a loss of pro‐opioid activity of NPFF after carrageenan inflammation [29] and a lack of sensitivity to naloxone of the anti‐allodynic effect of 1DMe in neuropathic rats [30]. In mice, the intrathecal injection of 1DMe also potentiates morphine analgesia [31]. Both the antinociception and the potentiation of morphine‐induced analgesia elicited by NPFF analogs are blocked by delta and mu opioid antagonists, suggesting the involvement of these two opioid receptor types in mediating indirectly NPFF effects [32–34].…”
Section: Pharmacological Cross‐talkmentioning
confidence: 99%
“…From a therapeutic point of view, it would be important to study the effect of NPFF agonists after systemic injection. Intraperitoneal injection of 1DMe has been shown to induce anti‐opioid activity at low dose and pro‐opioid activity at higher dose in the mouse tail flick test [31], while systemic dNPA was anti‐opioid in the same test [41]. Further progress will depend on the development of small molecules showing high specificity towards receptor subtypes and a better capacity to cross the blood brain barrier.…”
Section: Pharmacological Cross‐talkmentioning
confidence: 99%