Rakkyo (Allium chinense)-Derived Fructan Stimulates Collagen and Hyaluronan Synthesis in Human Dermal Fibroblasts

Area of Science:

• Biochemistry
• Dermatology
• Plant Science

Background:

• Fructans, fructose-based polysaccharides, have known biological activities.
• Their specific effects on skin cells and extracellular matrix (ECM) metabolism are not fully understood.

Purpose of the Study:

• To investigate the biological activity of rakkyo-derived fructan (RF).
• To examine RF's effects on collagen and hyaluronan synthesis in human dermal fibroblasts.

Main Methods:

• RF was extracted from rakkyo bulbs and characterized by molecular weight and structure.
• Human dermal fibroblasts were cultured with RF (0.1-1.0 mg/mL).
• Cell viability, ECM gene expression (COL1A1, HAS2, Hyal1, LOX, MMP-1), collagen, and hyaluronan production were quantified.

Main Results:

• RF (≤1 mg/mL) increased viable cell number and upregulated COL1A1 and HAS2 expression, while downregulating Hyal1.
• Type I collagen and hyaluronan production increased by 3.8-fold and 1.3-fold, respectively, after 9 days.
• RF upregulated LOX mRNA, suggesting enhanced collagen cross-linking, with modest MMP-1 induction.

Conclusions:

• Rakkyo-derived fructan directly stimulates collagen and hyaluronan synthesis in dermal fibroblasts.
• RF modulates ECM metabolism through the regulation of specific genes.
• Further research in complex skin models and in vivo is warranted to validate these findings.