Immunomodulatory activity of orphanin FQ/nociceptin on traumatic rats.
Abstract
AIM: To explore the neuro-immune modulatory effect of orphanin FQ/nociceptin
(OFQ) and opioid receptor like 1 (ORL1) receptor on the traumatic rats.
METHODS: The quantitative method of immuno-cytochemistry and i n situ
hybridization combined with cytokine bioassay were used to detect the expression
of endogenous OFQ and ORL1 and the production of interleukin-1 (IL-1) and tumor
necrosis factor-alpha (TNF-alpha) from peritoneal macrophage.
RESULTS: Strong signals for both OFQ immuno-reactive cells and ORL1 mRNA were
detected in cerebral cortex, hippocampus, and hypothalamus in normal condition,
whereas they were significantly reduced after trauma (P<0.05). However, the
production of IL-1 and TNF-alpha from peritoneal macrophage was increased, when
expressed as percentage of enhancement, the increment attained to 233 % and 521 %
(sample dilution 1:4), 195 % and 566 % (1:8), 233 % and 757 % ( 1:16), 214 % and
622 % (1:32), respectively, after trauma. After icv injection of OFQ at doses of
0.055 nmol, 0.55 nmol, and 2.75 nmol, the units of IL-1 and TNF-alpha were
reversed (P<0.05); however, the action of OFQ (0.55 nmol) was blocked by ORL1
selective antagonist [phe1psi(CH2-NH)Gly2]nociceptin-(1-13)-NH2.
CONCLUSION: OFQ and ORL1, the new opioid peptide system, are involved in the
immune response elicited by traumatic stress.
Keywords:
(OFQ) and opioid receptor like 1 (ORL1) receptor on the traumatic rats.
METHODS: The quantitative method of immuno-cytochemistry and i n situ
hybridization combined with cytokine bioassay were used to detect the expression
of endogenous OFQ and ORL1 and the production of interleukin-1 (IL-1) and tumor
necrosis factor-alpha (TNF-alpha) from peritoneal macrophage.
RESULTS: Strong signals for both OFQ immuno-reactive cells and ORL1 mRNA were
detected in cerebral cortex, hippocampus, and hypothalamus in normal condition,
whereas they were significantly reduced after trauma (P<0.05). However, the
production of IL-1 and TNF-alpha from peritoneal macrophage was increased, when
expressed as percentage of enhancement, the increment attained to 233 % and 521 %
(sample dilution 1:4), 195 % and 566 % (1:8), 233 % and 757 % ( 1:16), 214 % and
622 % (1:32), respectively, after trauma. After icv injection of OFQ at doses of
0.055 nmol, 0.55 nmol, and 2.75 nmol, the units of IL-1 and TNF-alpha were
reversed (P<0.05); however, the action of OFQ (0.55 nmol) was blocked by ORL1
selective antagonist [phe1psi(CH2-NH)Gly2]nociceptin-(1-13)-NH2.
CONCLUSION: OFQ and ORL1, the new opioid peptide system, are involved in the
immune response elicited by traumatic stress.