The effect of three doses of indomethacin (Indo) on BCG-induced PMN migration at different times of day was studied in Swiss mice kept on a lighting regimen of LD 12:12, with L from 07:00 to 19:00. Experimental granulomas were induced by subcutaneous implantation of BCG-impregnated cell traps for a time span of 480 min. Doses of 1, 3 and 9 mg/kg of Indo were given orally one hour before trap implantation, at 01:00, 05:00, 09:00, 13:00, 17:00 and 21:00 hr. In sham animals, the maximal PMN count occurred at 17:00 hr. In treated mice, Indo increased or decreased the number of PMN/mm2 as a function of time of administration. Cell migration was inhibited at 17:00 hr by all 3 Indo doses, while the number of PMN in the cell trap increased at 21:00 hr. Various dose-effects were obtained at the other times of day. Several hypotheses are proposed to explain the conflicting data. The results indicate the importance of the time of drug administration in biology.
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