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| Content Provider | PubMed Central |
|---|---|
| Author | Motta, J. I. Da Cunha, F. Q. Vargaftig, B. B. Ferreira, S. H. |
| Abstract | 1. In guinea-pigs previously sensitized with ovalbumin, the intra-plantar administration of the antigen induced dose-dependent and sustained oedema. An intense infiltrate of neutrophils and eosinophils was observed at the peak of the oedema (4 h). 2. Oedema induced by ovalbumin at the doses of 50 or 200 micrograms/paw was not inhibited by antihistamines (meclizine and cetirizine), a PAF antagonist (BN 50730), a cyclo-oxygenase inhibitor (indomethacin), a lipoxygenase inhibitor (MK-886), a dual type lipo- and cyclo-oxygenase inhibitor (NDGA), a bradykinin antagonist (Hoe 140) or the combination of cetirizine, MK-886, indomethacin and BN 50730. These drugs did inhibit paw oedema induced by their specific agonists or by carrageenin. These results suggest that histamine, PAF, prostaglandins, leukotrienes or bradykinin are not important in the development of immune paw oedema in guinea-pigs. 3. Dexamethasone (10 mg kg-1) inhibited oedema induced by ovalbumin (50 or 200 micrograms/paw, P < 0.05). This effect apparently does not result from inhibition of arachidonate metabolism, since indomethacin, MK-886 and NDGA were without effect. 4. Oedema induced by ovalbumin (50 or 200 micrograms/paw) was also inhibited by azelastine. This effect was not due to the anti-histaminic property of azelastine since two other potent-antihistamines, meclizine and cetirizine, were ineffective. 5. Intravenous injection of lipopolysaccharide (LPS) dose-dependently inhibited the oedema induced by ovalbumin (200 micrograms/paw). This effect could not be attributed to hypotension or leucopenia since the maximal dose applied (81 micrograms kg-1) did not induce significant changes in the blood pressure or in the white blood cell levels of the animals.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Starting Page | 111 |
| File Format | |
| ISSN | 00071188 |
| Journal | British Journal of Pharmacology |
| Issue Number | 1 |
| Volume Number | 112 |
| Language | English |
| Publisher Date | 1994-05-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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