Diosgenin, a steroidal sapogenin, enhances antigen-specific IgG2a and interferon-gamma expression in ovalbumin-sensitized BALB/c mice.
The effect of diosgenin, the most abundant sapogenin in Chinese yam, on humoral immunity was investigated. Ovalbumin (OVA)-sensitized and challenged BALB/c mice were administered daily with diosgenin for 34 days. The production of OVA-specific serum IgG2a was significantly enhanced by diosgenin treatment, whereas total IgE and OVA-specific IgG1, IgG2a and IgM were unaffected. In parallel with the enhancement of IgG2a, OVA-induced IFN-gamma secretion and mRNA expression were markedly elevated in splenocytes of diosgenin-treated mice, whereas IL-4 expression was unaltered. Furthermore, the expression of T-bet, but not of GATA-3, in splenocytes was up-regulated by diosgenin administration. However, diosgenin treatment did not modulate IL-4 mRNA expression and inflammatory cell infiltration in the lung of OVA-sensitized and challenged mice. Collectively, these data suggest that diosgenin regulates the systemic immune response towards the Th1 direction in response to OVA sensitization. The present study provides evidence to show that intake of diosgenin modulates certain aspects of acquired immunity, including the enhancement of antigen-specific IgG2a and IFN-gamma expression, which may be mediated through the up-regulation of Th1 differentiation.
Jan
Tong-Rong
TR
Department of Veterinary Medicine, National Taiwan University, Taipei, Taiwan, ROC. tonyjan@ntu.edu.tw
Wey
Shiaw-Pyng
SP
Kuan
Chio-Chin
CC
Liao
Mei-Hsiu
MH
Wu
Hsin-Yin
HY
D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D004144:Diosgenin / Q000494:pharmacology*; D007114:Immunization; D007073:Immunoglobulin E / Q000097:blood / Q000276:immunology; D007074:Immunoglobulin G / Q000097:blood / Q000276:immunology*; D007371:Interferon-gamma / Q000378:metabolism*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D010047:Ovalbumin / Q000276:immunology*; D012333:RNA, Messenger / Q000378:metabolism; D018417:Th1 Cells / Q000166:cytology / Q000187:drug effects; D018418:Th2 Cells / Q000166:cytology / Q000187:drug effects
D007074:Immunoglobulin G; D012333:RNA, Messenger; D007073:Immunoglobulin E; D007371:Interferon-gamma; D010047:Ovalbumin; D004144:Diosgenin