title: Diurnal variation of heart rate, locomotor activity, and body temperature in interleukin-1 alpha/beta doubly deficient mice.
abstract: This study was investigated the roles of interleukin-1 (IL-1) on diurnal rhythms of heart rate (HR), locomotor activity (LA), and body temperature (BT). For this purpose, HR, LA, and BT were recorded from conscious and unrestrained IL-1 alpha/beta doubly deficient (KO) and normal C57BL/6J mice using a telemetry system. These parameters were continuously recorded from just after to 2 weeks after transmitter implantation, because we thought that the surgical stress-induced IL-1 might affect the biobehavioral activities of the animals. At 1 day after implantation, HR and LA in IL-1 alpha/beta KO mice were higher than those in C57BL/6J mice. While BT in IL-1 alpha/beta KO mice was lower than that in C57BL/6J mice. Moreover, diurnal rhythmicity in these parameters after implantation in IL-1 alpha/beta KO mice appeared earlier than in C57BL/6J mice. At 2 weeks after implantation, there were no significant differences in the light- and dark-phase values of each parameter between IL-1 alpha/beta KO and C57BL/6J mice, however, IL-1 alpha/beta KO mice showed clear ultradian rhythmicity. It is thought that a phenotypical difference in biobehavioral activities between IL-1 alpha/beta KO and C57BL/6J mice may reflect IL-1 induced febrile and behavioral responses. These results suggest that IL-1 may play important physiological and pathophysiological roles on biobehavioral activities.
authors.affiliation: Department of Comparative Pathophysiology, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Furuzawa
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Kuwahara
authors.forename: Keiji
authors.initials: K
authors.lastname: Ishii
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Iwakura
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Tsubone
mesh_terms: D000818:Animals; D001831:Body Temperature / Q000502:physiology*; D002940:Circadian Rhythm; D006339:Heart Rate / Q000502:physiology*; D007375:Interleukin-1 / Q000172:deficiency* / Q000235:genetics / Q000502:physiology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009043:Motor Activity / Q000502:physiology*; D012890:Sleep; D013686:Telemetry
chemical_list: D007375:Interleukin-1