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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | King, Michelle A. Leon, Lisa R. Morse, Deborah A. Clanton, Thomas L. |
| Description | Author Affiliation: King MA ( University of Florida.); Leon LR ( U.S. Army Research Institute of Environmental Medicine.); Morse DA ( University of Florida.); Clanton TL ( University of Florida tclanton@hhp.ufl.edu.) |
| Abstract | In heat stroke, cytokines are believed to play important roles in multi-organ dysfunction and recovery of damaged tissue. The time course of the cytokine response is well defined in passive heat stroke (PHS), but little is known about exertional heat stroke (EHS). In this study we used a recently developed mouse EHS model to measure the responses of circulating cytokines/chemokines and cytokine gene expression in muscle. A very rapid increase in circulating IL-6 was observed at max core temperature (Tc,max) that peaked at 0.5 h of recovery and disappeared by 3 h. IL-10 was not elevated at any time. This contrasts with PHS where both IL-6 and IL-10 peak at 3 h of recovery. KC, G-CSF, MIP-2, MIP-1 and MCP-1 also demonstrated near peak responses at 0.5 h. Only G-CSF and KC remained elevated at 3 h. Muscle mRNA for innate immune cytokines (IL-6, IL-10, IL-1ß, but not TNF ) were greatly increased in diaphragm and soleus compared to similar measurements in PHS. We hypothesized that these altered cytokine responses in EHS may be due to a lower Tc,max achieved in EHS or a lower overall heat load. However, when these variables were controlled for, they could not account for the differences between EHS and PHS. We conclude that moderate exercise, superimposed on heat exposure, alters the pattern of circulating cytokine and chemokine production and muscle cytokine expression in EHS. This response may comprise an endocrine reflex to exercise in heat that initiates survival pathways and early-onset tissue repair mechanisms. |
| File Format | HTM / HTML |
| ISSN | 87507587 |
| e-ISSN | 15221601 |
| Journal | Journal of Applied Physiology |
| Language | English |
| Publisher | American Physiological Society |
| Publisher Date | 2016-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Applied Physiology Molecular Biology Biochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Physiology (medical) Sports Science |
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