Abstract:
:Nitric oxide (NO) surprisingly caused the opposite effect on histamine and serotonin edema. The local injection of acidified nitrite (0.3-30 micrograms/paw which correspond 10 micrograms-1 mg/kg) increased histamine edema of mice up to 45 +/- 4% and suppressed serotonin edema to 90 +/- 3%. Other NO-generators (nitroprusside sodium and hydroxylamine) showed similar effects. These results were in accordance with our previous data on endogenous NO. Methylene blue (MB, 30 ng/paw which corresponds to 1 microgram/kg) suppressed histamine edema (62 +/- 3%) and increased serotonin edema (43 +/- 3%) in normal mice, being reversed by acidified nitrite. This suggests the involvement of guanosine 3',5'-cyclic monophosphate (cGMP) formation for the action of NO. Histamine edema became sensitive to H2-antagonist, cimetidine, by co-injection of 30 micrograms/paw (which corresponds to 1 mg/kg) acidified nitrite (ED50 = 30 micrograms/kg versus > 1 mg/kg). NO seemed to modify the histamine receptor(s) or tautomeric form of histamine. NO, O2- and other oxyradicals might finely control the vascular permeability together with inflammatory mediators.
journal_name
Life Scijournal_title
Life sciencesauthors
Oyanagui Y,Sato Sdoi
10.1016/0024-3205(93)90072-bsubject
Has Abstractpub_date
1993-01-01 00:00:00pages
PL159-64issue
17eissn
0024-3205issn
1879-0631pii
0024-3205(93)90072-Bjournal_volume
52pub_type
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