Epinephrine causes a reduction in lymph node cell output in sheep
| Autor: | Bill Ristevski, Jiri Zamecnik, John B. Hay, Roy J. Shephard, Pang N. Shek, Timothy J Seabrook, Shawn G. Rhind |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Pharmacology
medicine.medical_specialty Physiology business.industry Lymphocyte General Medicine Lymphatic system Endocrinology medicine.anatomical_structure Epinephrine Physiology (medical) Internal medicine Circulatory system medicine Catecholamine Lymph Leukocytosis medicine.symptom business Lymph node medicine.drug |
| Zdroj: | Canadian Journal of Physiology and Pharmacology. 79:246-252 |
| ISSN: | 1205-7541 0008-4212 |
| DOI: | 10.1139/y00-124 |
| Popis: | The lymphatic system has a critical role in the return of fluids, proteins, and cells to the circulatory system. However, the effects of stress, including exercise, on this system have not been adequately studied. We investigated the effect of a physiological dose (1 mg) of epinephrine (Epi) on lymph flow, cell concentration, and lymphocyte subsets in efferent subcutaneous lymph in sheep. Blood leukocyte numbers, differential, lymphocyte subsets, and blood and lymph pools of lymphocytes were determined simultaneously. A significant acute increase in lymph flow was followed by a post-injection decrease in flow and cellular output. No changes in lymphocyte subsets or pools of lymphocytes were seen in either blood or lymph. The timing of elevated plasma and lymph concentrations of Epi and norepinephrine (NE) corresponded with the increased lymph flow. In conclusion, Epi injection caused no change in lymphocyte subset distribution, leukocyte concentration, or pools of lymphocytes. A decrease in lymph flow and cellularity was documented post-injection, indicating that lymphatic tissue has no role in the leukocytosis seen after Epi injection. Lymphocyte retention by lymph nodes, however, may contribute to post-injection lymphopenia.Key words: lymphocyte recirculation, catecholamines, exercise, stress, lymph. |
| Databáze: | OpenAIRE |
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