Aureobasidium pullulans produced β-glucan is effective to enhance Kurosengoku soybean extract induced Thrombospondin-1 expression

This study reveals a novel synergistic mechanism by which Aureobasidium pullulans beta-glucan enhances its anti-cancer potential through combination with Kurosengoku (black soybean) extract — specifically by upregulating thrombospondin-1 (TSP-1), the body's own anti-angiogenic protein.

Key findings:

• AP-beta-glucan + Kurosengoku soybean extract synergistically upregulates TSP-1 expression
• Synergistic effect significantly greater than either compound alone
• TSP-1 is an endogenous inhibitor of tumor angiogenesis (new blood vessel formation that feeds tumors)
• Validated in both in vitro cell studies and in vivo animal models

Significance: Angiogenesis — the formation of new blood vessels to supply growing tumors — is a hallmark of cancer progression. TSP-1 is one of the body's natural defenses against this process. This study shows AP-beta-glucan can amplify TSP-1 production, especially in combination with polyphenol-rich Kurosengoku soybean. This is a distinct anti-cancer mechanism from NK cell activation (the most-studied AP-glucan pathway), adding a third mode of anti-tumor action: direct apoptosis, NK cell activation, AND anti-angiogenesis via TSP-1 upregulation.