Investigating immune-modulatory function of α-glucopyranose-rich compound polysaccharides by MC38-N4/OT-I co-culture system.

ABSTRACT

The potential antitumor function of polysaccharides is well accepted, it is unclear whether polysaccharides have immunoregulatory effect on CD8+ T lymphocyte cells to attack tumor cells. To evaluate the CD8+ T function enhancing role of polysaccharide compounds, the MC38-N4/OT-I co-culture system was established. The synergistic and complementary immune effect of α-glucopyranose-rich compound polysaccharides can be achieved by manipulating the antigen-specific T-cell expansion capacity and efficacy. This study was designed to investigate the antitumor-enhancement activity of a α-glucopyranose-rich compound polysaccharides by determining the activation of CD8+ T cells in a co-culture system. Compared to the control group (42.5 % ± 0.72 %), the specific α-glucopyranose-rich compound polysaccharides, comprising Agaricus blazei Murill, Grifola frondosa and Pericarpium Citri Reticulatae, demonstrated a significant decrease (20.4 % ± 1.23 %, p < 0.05) in the survival rate of MC38-N4 cells in the co-culture system. Additionally, the α-glucopyranose-rich compound polysaccharides resulted in a substantial increase (p < 0.01) in the proportion of CD8+ T cells and CD62L+ central memory T cells, which is a less differentiated T cell subset with high immune activity. Collectively, we reported that specific polysaccharide combination, which remodel the function of cytotoxic T cells and provided a basis for improving immune functions by using the specific types of polysaccharides.