Naive and memory t cell subsets are differentially mobilized during physical stress
Deutscher übersetzter Titel: | Einfach- und Gedächtnis-T-Zell-Subpopulationen werden während körperlichem Stress unterschiedlich mobilisiert |
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Autor: | Gannon, G.A.; Rhind, S.; Shek, P.N.; Shephard, R.J. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 23 (2002), 3, S. 223-229, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2002-23173 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU200404001209 |
Quelle: | BISp |
Abstract des Autors
This study examined the naive and memory phenotypic profiles of CD4+ and CD8hi T cells that were mobilized to the peripheral circulation during a combination of aerobic exercise and heat stress, determining expression of the adhesion molecules CD62L and CD11a on the recruited cells. Twelve recreationally active males (age 27.1 ± 5.3 yr, height 1.77 ± 0.08 m, mass 76.9 ± 12.0 kg, VO2peak 43.9 ± 6.7 mL/kg/min) completed a 40 min bout of cycle ergometry at 65 % of VO2peak while immersed to midchest in a water bath at 39 °C. Venous blood samples were collected before (T0), during (T40) and 30 min after (T70) exposure to combined exercise and heat stress. Specimens were analyzed by three-colour flow cytometry for CD4+ and CD8hi T cell expression of CD45RO, CD11a and CD62L. Some 80 % of the CD4+ T cells that were mobilized were of the CD45RO memory phenotype, with the numbers of CD11alo and CD62L+ cells increasing more than those of CD11ahi and CD62L- cells. For the CD8hi cells, there was a more equal recruitment of CD45RO- naive (43 %) and CD45RO+ memory (57 %) cells. The majority (84 %) of recruited CD8+ cells were CD11ahi; there was a trend to predominance of CD62L- cells (57 %) for the memory subset, but with almost equal recruitment of CD62L+/- for the naive subset. We conclude that the exercise + heat stress induced trend to an increase in CD4+ T cells is linked in some way to memory phenotype; it cannot be explained simply by a high density expression of CD11a and lack of the lymph node homing receptor (CD62L). Furthermore, although mobilization of CD8hi T cells is not linked to memory phenotype, a high density expression of CD11a and a lack of the lymph node homing receptor are important determinants of CD8hi T cell mobilization. Verf.-Referat