Immunomodulatory activity of macromolecular polysaccharide isolated from Grifola frondosa

Area of Science:

• Immunology
• Pharmacology
• Mycology

Background:

• Immunosuppression is a critical condition affecting immune system function.
• Grifola frondosa polysaccharides (GFP) are known for potential biological activities.
• Understanding the specific immune-modulating effects of GFP components is crucial.

Purpose of the Study:

• To evaluate the immune-modulating effects of a Grifola frondosa polysaccharide component (GFP-A).
• To investigate GFP-A's efficacy in a cytoxan (CTX)-induced immunosuppression mouse model.
• To determine GFP-A's impact on phagocytosis, splenocyte proliferation, and immune cell populations.

Main Methods:

• Mouse peritoneal macrophage and CTX-induced immunosuppression models were utilized.
• Phagocytotic and mononuclear phagocytic system function assays were performed.
• Splenocyte proliferation assays, thymus and spleen index measurements, and analysis of cytokine mRNA and T lymphocyte expression were conducted.

Main Results:

• GFP-A significantly stimulated phagocytosis and splenocyte proliferation, particularly when combined with ConA or LPS.
• Administration of GFP-A increased thymus and spleen indices and altered spleen enzyme levels (LDH, ACP).
• GFP-A elevated mRNA levels of IL-1β, IL-2, IL-6, and IFN-γ, and increased CD4(+) and CD8(+) T lymphocyte expression in splenocytes, counteracting CTX-induced suppression.

Conclusions:

• The study demonstrates that GFP-A possesses significant immune-modulating properties.
• GFP-A effectively enhances cellular and humoral immune responses.
• These findings suggest GFP-A has potential as a therapeutic agent for counteracting immunosuppression.