title: [Delayed augmentation effect of cytokine production after hyperthermia stimuli].
abstract: Heatstroke is considered an important condition that may contribute to endothelial cell damage. The aim of this study was to assess temporal profiles of the cytokine (IL-6 and IL-8) and mRNA production when endothelial cells undergo higher temperature stimuli. In the first group, human umbilical vascular endothelial cells (HUVECs)were cultured at 4 different temperatures (37, 38, 39 or 40 degrees C) for 1, 3 and 5 h. In the second group, HUVECs were cultured at 37 degrees C for 4 h or 23 h, after stimulation by heating for one hour at the same culture temperatures used in the first group (37 degrees C to 40 degrees C). After culturing, IL-6 and IL-8 mRNA and protein levels were measured. It has been found the cytokine mRNA levels being significantly higher (p < 0.001) in all cells incubated at higher temperatures than those in the control (cultivation at 37 degrees C). At the same time, the productionof IL-6 and 8 at a higher temperature (39, 40 degrees C) was significantly lower (p < 0.001) than at 37 degrees C (control), and the decrease was temperature dependent. However, IL-6 and IL-8 levels were significantly greater in the cells at 23 h after transient hyperthermic (40 degrees C, 1 h) stimulation than in control ones (p < 0.001).After a transient hyperthermia, the production of the cytokines in HUVECs is initially inhibited and then augmented. The results indicated that tissue injury might continue to develop after a hyperthermic event. There might be a potent risk for underestimation of cytokine induced tissue injury in the acute phase of a heatstroke.
authors.forename: K
authors.initials: K
authors.lastname: Kinoshita
authors.forename: A
authors.initials: A
authors.lastname: Sakurai
authors.forename: J
authors.initials: J
authors.lastname: Yamaguchi
authors.forename: M
authors.initials: M
authors.lastname: Furukawa
authors.forename: K
authors.initials: K
authors.lastname: Tanjoh
mesh_terms: D002478:Cells, Cultured; D005334:Fever / Q000378:metabolism*; D061307:Human Umbilical Vein Endothelial Cells / Q000378:metabolism; D006801:Humans; D015850:Interleukin-6 / Q000235:genetics / Q000378:metabolism*; D016209:Interleukin-8 / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
chemical_list: D015850:Interleukin-6; D016209:Interleukin-8; D012333:RNA, Messenger