Abstract
A tricyclic chromone, proxicromil (sodium 6,7,8,9-tetrahydro-5-hydroxy-4-oxo-10-propyl-naphtho (2,3-b) pyran-2-carboxylate), has been tested for activity against certain immunological and inflammatory reactions.
When given parenterally it suppressed the development of delayed hypersensitivity reactions in sensitized mice and guinea-pigs but did not affect the rejection of skin allografts in mice. The compound had no activity against certain in vitro correlates of delayed hypersensitivity reactions (lymphocyte transformation and lymphokine activity), but did have an inhibitory effect on lymphokine (MIF) production at 10−4 M but not at 10−5 M.
Proxicromil was also found to be active in non-immunologically mediated models of inflammation and in models having an immunological component which are known to be sensitive to non-steroidal anti-inflammatory drugs (adjuvant arthritis, reversed passive Arthus reaction).
The activity of this compound was enhanced when administered in arachis oil when compared to its activity in saline.
Proxicromil has no direct activity on the development of immune responsiveness but appears to suppress the expression of delayed hypersensitivity and immune complex mediated hypersensitivity reactions by virtue of its anti-inflammatory properties. This activity is not associated with inhibition of cyclo-oxygenase.
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Keogh, R.W., Bundick, R.V., Cunnington, P.G. et al. The activity of an anti-allergic compound, proxicromil, on models of immunity and inflammation. Agents and Actions 11, 361–372 (1981). https://doi.org/10.1007/BF01982472
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DOI: https://doi.org/10.1007/BF01982472