Immunomodulatory effects of betulinic acid from the bark of white birch on mice.
The objective of this study was to explore the immunomodulatory effects of betulinic acid (BA) extracted from the bark of white birch on mice. Female mice were orally administered BA for 14 days in doses of 0, 0.25, 0.5, and 1 mg/kg body weight. We found that BA significantly enhanced the thymus and spleen indices, and stimulated lymphocyte proliferation induced by Concanavalin A and lipopolysaccharide as shown by MTT assay. Flow cytometry revealed that BA increased the percentage of CD4(+) cells in thymus as well as the percentage of CD19(+) and the ratios of CD4(+)/CD8(+) in spleen. BA increased the number of plaque-forming cell and macrophage phagocytic activity as indicated by a neutral red dye uptake assay, and the peritoneal macrophages levels of TNF-α were also increased. In contrast, serum levels of IgG and IgM and serum concentrations of IL-2 and IL-6 were significantly decreased in BA-treated mice compared to the control as assayed by haemagglutination tests and ELISA, respectively. Taken together, these results suggest that BA enhances mouse cellular immunity, humoral immunity, and activity of macrophages. Thus, BA is a potential immune stimulator and may strengthen the immune response of its host.
College of Animal Medicine, Hunan Agricultural University, Changsha, 410128, P.R. China.
Jin-e
JE
Yi
Bozena
B
Obminska-Mrukowicz
Li-yun
LY
Yuan
Hui
H
Yuan
D056704:Adaptive Immunity / Q000187:drug effects*; D000818:Animals; D029662:Betula / Q000737:chemistry*; D049109:Cell Proliferation / Q000187:drug effects; D016207:Cytokines / Q000097:blood; D005260:Female; D007113:Immunity, Innate / Q000187:drug effects*; D007155:Immunologic Factors / Q000494:pharmacology*; D008264:Macrophages / Q000187:drug effects; D051379:Mice; D053978:Pentacyclic Triterpenes; D010587:Phagocytosis / Q000187:drug effects; D011897:Random Allocation; D013154:Spleen / Q000166:cytology; D013950:Thymus Gland / Q000166:cytology; D014315:Triterpenes / Q000494:pharmacology*; D000094062:Betulinic Acid
D016207:Cytokines; D007155:Immunologic Factors; D053978:Pentacyclic Triterpenes; D014315:Triterpenes; D000094062:Betulinic Acid