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Diurnal variations in fever induced by intravenous LPS injection in pigeons

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Abstract

Pigeons show a profound circadian rhythmicity of core temperature (Tcore). The Tcore is about 42 °C during the daytime and about 40 °C at night. Intravenous injections of bacteria] endotoxin (LPS: lipopolysaccharide) during the day and night in pigeons evoked fevers of different magnitude. When LPS was injected during the day, Tcore first decreased from 41.8 ± 0.2 °C to 41.4 ± 0.3 °C, then started to increase after about 1.5 hrs, reaching 42.9 ± 0.2 °C about 5 hrs after the injection. When LPS was injected at night, Tcore immediately increased from 40.3 ± 0.2 °C to 41.8 ± 0.3 °C within 5 hrs after the injection. Fever continued for about 13 hrs when endotoxin was injected during the day, but only for about 9 hrs when it was injected at night. Compared with the diurnal pattern of afebrile core emperatures, fever was superimposed on the circadian rhythmicity. This suggests that the control of circadian rhythm of core temperature is not disturbed during fever.

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  1. Department of Central Nervous System, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakaecho, Itabashi-ku, 173, Tokyo, Japan

    S. Nomoto

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  1. S. Nomoto
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Nomoto, S. Diurnal variations in fever induced by intravenous LPS injection in pigeons. Pflügers Arch. 431, 987–989 (1996). https://doi.org/10.1007/s004240050096

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  • DOI: https://doi.org/10.1007/s004240050096

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