tetano
Editor, Senior Moderator
PLoS One. 2015 Mar 18;10(3):e0120918. doi: 10.1371/journal.pone.0120918. eCollection 2015.
[h=1]Obesity Impairs γδ T Cell Homeostasis and Antiviral Function in Humans.[/h] Costanzo AE[SUP]1[/SUP], Taylor KR[SUP]2[/SUP], Dutt S[SUP]3[/SUP], Han PP[SUP]4[/SUP], Fujioka K[SUP]5[/SUP], Jameson JM[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] Obese patients are susceptible to increased morbidity and mortality associated with infectious diseases such as influenza A virus. γδ T cells and memory αβ T cells play key roles in reducing viral load by rapidly producing IFN-γ and lysing infected cells. In this article we analyze the impact of obesity on T lymphocyte antiviral immunity. Obese donors exhibit a reduction in γδ T cells in the peripheral blood. The severity of obesity negatively correlates with the number of γδ T cells. The remaining γδ T cells have a skewed maturation similar to that observed in aged populations. This skewed γδ T cell population exhibits a blunted antiviral IFN-γ response. Full γδ T cell function can be restored by potent stimulation with 1-Hydroxy-2-methyl-buten-4yl 4-diphosphate (HDMAPP), suggesting that γδ T cells retain the ability to produce IFN-γ. Additionally, γδ T cells from obese donors have reduced levels of IL-2Rα. IL-2 is able to restore γδ T cell antiviral cytokine production, which suggests that γδ T cells lack key T cell specific growth factor signals. These studies make the novel finding that the γδ T cell antiviral immune response to influenza is compromised by obesity. This has important implications for the development of therapeutic strategies to improve vaccination and antiviral responses in obese patients.
PMID: 25785862 [PubMed - in process] Free full text
[h=1]Obesity Impairs γδ T Cell Homeostasis and Antiviral Function in Humans.[/h] Costanzo AE[SUP]1[/SUP], Taylor KR[SUP]2[/SUP], Dutt S[SUP]3[/SUP], Han PP[SUP]4[/SUP], Fujioka K[SUP]5[/SUP], Jameson JM[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] Obese patients are susceptible to increased morbidity and mortality associated with infectious diseases such as influenza A virus. γδ T cells and memory αβ T cells play key roles in reducing viral load by rapidly producing IFN-γ and lysing infected cells. In this article we analyze the impact of obesity on T lymphocyte antiviral immunity. Obese donors exhibit a reduction in γδ T cells in the peripheral blood. The severity of obesity negatively correlates with the number of γδ T cells. The remaining γδ T cells have a skewed maturation similar to that observed in aged populations. This skewed γδ T cell population exhibits a blunted antiviral IFN-γ response. Full γδ T cell function can be restored by potent stimulation with 1-Hydroxy-2-methyl-buten-4yl 4-diphosphate (HDMAPP), suggesting that γδ T cells retain the ability to produce IFN-γ. Additionally, γδ T cells from obese donors have reduced levels of IL-2Rα. IL-2 is able to restore γδ T cell antiviral cytokine production, which suggests that γδ T cells lack key T cell specific growth factor signals. These studies make the novel finding that the γδ T cell antiviral immune response to influenza is compromised by obesity. This has important implications for the development of therapeutic strategies to improve vaccination and antiviral responses in obese patients.
PMID: 25785862 [PubMed - in process] Free full text