Reversion of hemoglobin proportions toward newborn values is a characteristic change found in blood of acutely bled adult rats. In this study, adult Sprague-Dawley rats were bled over a period of time until they became anemic by hematologic parameters. We measured plasma prostaglandin E2 levels of anemic and control rats using double-antibody technique. A significant increase was recorded in bled plasma, and the value returned to unbled level when anemia was corrected. Acetylsalicylic acid intake during bleeding-induced anemia abolished the process of reverse switching of hemoglobin, as well as inhibited the increase in plasma PGE2 levels. Changes in hemoglobin proportions due to phlebotomy were also blocked when acetylsalicylic acid was replaced by indomethacin. These observations are of significance in understanding, at least in part, the mechanism of reverse hemoglobin switching in adult rats undergoing erythropoietic stress.
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