FR-A 19, a Histamine H2 agonist, inhibits the release of IgE-mediated human basophil histamine in a nanomolar range. It has additional potent anti-allergic properties.
FR 167653 (FR 167653 sulfate) is effective in treating inflammation, relieving trauma and ischemia-reperfusion injury in vivo. FR 167653 , an orally active and selective p38 MAPK inhibitor, is a potent suppressor of TNF-α and IL-1β production via specific inhibition of p38 MAPK activity.
FR 900490 is an immunoactive substance produced by a fungus Discosia sp. F-11809. In vitro FR-900490 restores the colony forming units in culture (cfu-c) in bone marrow cells, which were suppressed by immunosuppressive factor obtained from the serum of sa