Chronic exercise and the pro-inflammatory response to endotoxin in the serum and heart
| Autor: | V. Bruce Grossie, David S. Criswell, Kathryn M. Henry, Nancy M. DiMarco |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Lipopolysaccharides
medicine.medical_specialty Lipopolysaccharide Inflammatory response medicine.medical_treatment Immunology Exercise group Nitric Oxide Nitric oxide Rats Sprague-Dawley chemistry.chemical_compound Internal medicine Physical Conditioning Animal medicine Immunology and Allergy Animals Saline computer.programming_language Glucuronidase Inflammation biology sed business.industry Tumor Necrosis Factor-alpha Myocardium Body Weight Heart Organ Size Rats Nitric oxide synthase Endocrinology chemistry biology.protein Tumor necrosis factor alpha Female Nitric Oxide Synthase business computer |
| Zdroj: | Immunology letters. 95(2) |
| ISSN: | 0165-2478 |
| Popis: | Purpose: To examine the effects of moderate intensity chronic exercise on tumor necrosis factor-alpha (TNFα) and inducible nitric oxide synthase (iNOS) responses to endotoxin in female Sprague-Dawley rats. Methods: Rats were divided into two groups, exercise ( n = 17) and sedentary ( n = 24). Exercise (Ex) rats completed 12 weeks of motorized treadmill running 3 days/week for 15–25 min at 22–25 m/min, while sedentary (Sed) rats remained in their cages. Twenty-four hrs after the last exercise session, animals were subdivided into three groups. One subgroup served as baseline controls. These rats received an injection of saline (s) and were killed immediately (Sed-s and Ex-s), while the other groups received an injection of lipopolysaccharide (LPS). LPS animals were killed 2 h (Sed-L2 and Ex-L2) or 4 h after the LPS injection (Sed-L4 and Ex-L4). Results: Serum TNFα was elevated 2 h after LPS injection in both Sed and Ex groups, but was significantly higher in the chronic exercise group (Ex-L2 versus. Sed-L2). Similarly, serum β glucuronidase activity, an indicator of tissue damage, was elevated 2 and 4 h after LPS injection, and was significantly higher in the exercise groups. Post-treatment left ventricular TNFα and iNOS activity, as well as stable nitric oxide derivatives in the serum (NO x ), were significantly higher in LPS-injected groups compared to saline groups, but no difference in LPS effect was observed between sedentary and exercise groups. Conclusions: Moderate intensity chronic exercise stress caused an exaggerated serum TNFα response to endotoxin and an elevation in a serum marker of LPS-induced tissue damage. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect