4.5 Article

Aqueous extract of Passiflora alata leaves modulates in vitro the indoleamine 2,3-dioxygenase (IDO) and CD86 expression in bone marrow-derived professional antigen-presenting cells polarizing NOD mice T cells to a Treg profile

期刊

CYTOKINE
卷 152, 期 -, 页码 -

出版社

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cyto.2022.155832

关键词

Type 1 diabetes mellitus; NOD mice; Antigen-presenting cells and Passiflora alata

资金

  1. Sao Paulo Research Foundation (FAPESP) [2013/25256-8]
  2. National Council for Scientific and Technological Development (CNPq) -Brazil [448899/2014-0]
  3. CNPq [140575/2015-4, 305064/2018-5]

向作者/读者索取更多资源

A study found that the use of extract from Passiflora alata leaves can modulate bone marrow-derived professional antigen-presenting cells, reducing the proliferation of CD4 and CD8 T cells in diabetic mice and decreasing cytokine release in cell cultures. In addition, an increase in CD4(+)CD25(+)FoxP3(+) Tregs was observed in cell cultures from diabetic mice.
Dendritic cells (DCs) and macrophages are professional antingen-presenting cells (pAPCs), numerous in the pancreas of nonobese diabetic (NOD) mice and playing an essential role in the autoimmune response of type 1 diabetes. The expression of the enzyme indoleamine 2,3-dioxygenase (IDO) is a critical factor for the tolerogenic activity of pAPCs, acting in the catabolism of tryptophan, providing metabolites that suppress the T cell effectors and induce T regulatory cells differentiation. Here we investigated the in vitro mechanisms of lyophilized aqueous extract from Passiflora alata leaves (LAEPAL) that modulates bone marrow-derived professional antigen-presenting cells (BM-pAPCs), affecting their ability to polarize T cells. A cell culture model was defined using mixed cultures of BM-pAPCs and T lymphocytes NOD mice with stressed MIN-6 cells as a source of pancreatic beta cells antigens. We showed that the treatment with 300 mu g/mL of LAEPAL induces a significant decrease in the CD4 and CD8 T effector lymphocytes proliferation from diabetic but not in non-diabetic mice, followed by a reduction of the IL-6 and IFN-gamma cytokines release in the cell cultures supernatants. Moreover, we observed an increase of CD4(+)CD25(+)FoxP3(+) Tregs in the cell cultures from diabetic mice. These results could be partially explained by the LAEPAL modulatory effects in BM-pAPCs, downregulating the CD86 co-stimulatory molecule expression, and increasing IDO-1 expression in F4/80+ BM-pAPCs. These results contribute to a better understanding of the polyphenols' immunomodulatory properties, meaning they could induce tolerogenic antigen-presenting cells, which could polarize T cells to a Treg profile and decrease the activity of CD4+ and CD8+ T effector cells.

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