Nickel, T; Hanssen, H; Emslander, I; Drexel, V; Hertel, G; Schmidt-Trucksäss, A; Summo, C; Sisic, Z; Lambert, M; Hoster, E; Halle, M; Weis, M
Immunomodulatory effects of aerobic training in obesity.
Physical inactivity and obesity are independent risk factors for atherosclerosis. We analyzed the immunomodulatory capacity of 10-week intensified exercise training (ET) in obese and lean athletes. Markers of the innate immune response were investigated in obese (ONE: ET<=40 km/week) and lean athletes (LNE: ET<=40 km/week and LE: ET>>=55 km/week).Circulating dendritic cells (DC) were analyzed by flow-cytometry for BDCA-1/-2-expression. TLR-2/-4/-7 and MyD88 were analyzed by RT-PCR and Western blot. Circulating oxLDL levels were analyzed by ELISA.BDCA-1 expression at baseline was lower in ONE compared to both other groups (ONE 0.15%; LNE 0.27%; LE 0.33%; P< .05), but significantly increased in ONE after training (+50%; P< .05). In contrast, BDCA-2 expression at baseline was higher in ONE (ONE 0.25%; LNE 0.11%; LE 0.09%; P< .05) and decreased in ONE after the 10-week training period (-27%; P< .05). Gene activations of TLR-4 and TLR-7 with corresponding protein increase were found for all three groups (P< .01/P< .05) compared to pre training. A reduction of oxLDL levels was seen in ONE (-61%; P< .05).Intensified exercise induces an increase of BDCA-1+ DCs and TLR-4/-7 in obese athletes. We hereby describe new immune modulatory effects, which-through regular aerobic exercise-modulate innate immunity and pro-inflammatory cytokines in obesity.