Abstract
The effect of proteinase inhibitors such as TLCK, TPCK and leupeptin on vascular permeability was investigated in the carrageenin-air-pouch inflammation in rats. When each inhibitor was injected into the air-pouch immediately after carrageenin injection, TLCK, TPCK and leupeptin caused a rapid and significant increase in vascular permeability. The TLCK- and TPCK-induced increase declined gradually, whereas leupeptin inhibited the vascular permeability after the temporary increase. When the inhibitors were injected 5 h after carrageenin injection, TLCK and TPCK increased the vascular permeability, whereas leupeptin was without effect. Cyproheptadine, an anti-histamine and antiserotonin drug, inhibited the leupeptin-induced temporary increase, but failed to inhibit the TLCK- and TPCK-induced increase in vascular permeability. These results suggest that the leupeptin-induced increase in vascular permeability was mediated by histamine and serotonin, while TLCK and TPCK may increase vascular permeability as a result of a direct action on endothelial cells.
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Abbreviations
- TLCK:
-
N-α-p-tosyl-L-lysine chlorometyl ketone
- TPCK:
-
L-1-tosylamide-2-phenylethyl chlorometyl ketone
- F-BSA:
-
fluorescein isothiocyanate labeled bovine serum albumin
- PBS:
-
phosphate-buffered saline
- DMSO:
-
dimethylsulfoxide
- DFP:
-
diisopropylfluorophosphate
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Watanabe, K., Nakagawa, H. & Tsurufuji, S. Vascular permeability changes by proteinase inhibitors in carrageenin-induced inflammation in rats. Agents and Actions 17, 472–477 (1986). https://doi.org/10.1007/BF01965516
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DOI: https://doi.org/10.1007/BF01965516