Distribution and mitogen response of peripheral blood lymphocytes after exertional heat injury
| Autor: | Alexandre I. Dubovtsev, C. Bruce Wenger, Thomas A. Judy, David H. Morehouse, David A. DuBose, Scott Flinn |
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| Rok vydání: | 2003 |
| Předmět: |
Adult
Antigens Differentiation T-Lymphocyte Male Hyperthermia Adolescent CD3 Complex Fever Physiology Lymphocyte Physical exercise Heat Exhaustion Lesion Immune system Antigen Antigens CD Physiology (medical) medicine Humans Lectins C-Type Lymphocyte Count Lymphocytes Phytohemagglutinins business.industry Heatstroke Flow Cytometry medicine.disease Lymphocyte Subsets Peripheral Military Personnel medicine.anatomical_structure Immunology Female Mitogens medicine.symptom business Cell Division |
| Zdroj: | Journal of Applied Physiology. 95:2381-2389 |
| ISSN: | 1522-1601 8750-7587 |
| DOI: | 10.1152/japplphysiol.00039.2003 |
| Popis: | To determine whether immune disturbances during exertional heat injury (EHI) could be distinguished from those due to exercise (E), peripheral lymphocyte subset distributions and phytohemagglutinin-stimulated CD69 mitogen responses as discriminated by flow cytometry were studied in military recruits [18.7 ± 0.3 (SE) yr old] training in warm weather. An E group (3 men and 3 women) ran 1.75–2 miles. During similar E, 11 recruits (10 men and 1 woman) presented with suspected EHI. EHI (40.4 ± 0.3°C) vs. E (38.6 ± 0.2°C) body temperature was significantly elevated ( P < 0.05). Heat illness was largely classified as EHI, not heatstroke, because central nervous system manifestations were generally mild. Blood was collected at E completion or EHI onset (0 h) and 2 and 24 h later. At 0 h (EHI vs. E), suppressor, natural killer, and total lymphocyte counts were significantly elevated, helper and B lymphocyte counts remained similar, and the helper-to-suppressor ratio was significantly depressed. By 2 h, immune cell dynamics between groups were similar. From 0 to 24 h, T lymphocyte subsets revealed significantly reduced phytohemagglutinin responses (percent CD69 and mean CD69 fluorescent intensity) in EHI vs. E. Thus immune cell dynamics with EHI were distinguishable from E. Because heat stress as reported in exercise or heatstroke is associated with similar immune cell disturbances, these findings in EHI contributed to the suggestion that heat stress of varying severity shares a common pathophysiological process influencing the immune system. |
| Databáze: | OpenAIRE |
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