کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5916287 | 1570717 | 2016 | 13 صفحه PDF | دانلود رایگان |
- Endogenous galectin-3 restricts T helper responses during L. major infection.
- A crosstalk between galectin-3 and Notch signaling is proposed.
- Endogenous galectin-3 lowers the threshold of Notch signaling.
Galectin-3, an endogenous glycan-binding protein, is abundantly expressed at sites of inflammation and immune cell activation. Although this lectin has been implicated in the control of T helper (Th) polarization, the mechanisms underlying this effect are not well understood. Here, we investigated the role of endogenous galectin-3 during the course of experimental Leishmania major infection using galectin-3-deficient (Lgals3â/â) mice in a BALB/c background and the involvement of Notch signaling pathway in this process. Lgals3â/â mice displayed an augmented, although mixed Th1/Th2 responses compared with wild-type (WT) mice. Concomitantly, lymph node and footpad lesion cells from infected Lgals3â/â mice showed enhanced levels of Notch signaling components (Notch-1, Jagged1, Jagged2 and Notch target gene Hes-1). Bone marrow-derived dendritic cells (BMDCs) from uninfected Lgals3â/â mice also displayed increased expression of the Notch ligands Delta-like-4 and Jagged1 and pro-inflammatory cytokines. In addition, activation of Notch signaling in BMDCs upon stimulation with Jagged1 was more pronounced in Lgals3â/â BMDCs compared to WT BMDCs; this condition resulted in increased production of IL-6 by Lgals3â/â BMDCs. Finally, addition of exogenous galectin-3 to Lgals3â/â BMDCs partially reverted the increased sensitivity to Jagged1 stimulation. Our results suggest that endogenous galectin-3 regulates Notch signaling activation in BMDCs and influences polarization of T helper responses, thus increasing susceptibility to L. major infection.
Journal: Molecular Immunology - Volume 76, August 2016, Pages 22-34