IMMUNOSTIMULATING POLYSACCHARIDE SEPARATED FROM HOT WATER EXTRACT OF ANGELICA-ACUTILOBA KITAGAWA (YAMATO-TOHKI)

  • 1 January 1982
    • journal article
    • research article
    • Vol. 47  (1) , 75-83
Abstract
Separation of immunostimulating polysaccharide (AIP) from Angelica and its biological activities were investigated. AIP was separated as an acetone-insoluble and non-dialyzable fraction from hot water extract obtained by heating the root of A. acutiloba in water at 95.degree.-98.degree. C for 30 min. It is a water-soluble heteropolymer(s) consisting of uronic acid, hexose and peptide. The anti-tumor activity of AIP was observed in terms of prolongation of the survival period of mice bearing Ehrlich ascites cells. The uptake of tritiated thymidine into murine and human spleen cells could be stimluated by AIP in a dose-dependent manner. Murine B cells were activated polyclonally by AIP and differentiated to antibody-forming cells even in the absence of either helper T cells or macrophages. The possibility that the biological activity of AIP might be due to contamination by bacterial lipopolysaccharides (LPS) or lipid A-associated protein (LAP) was ruled out because: polyclonal B-cell activation by AIP was shown in spleen cell cultures of C3H/HeJ mice, a low responder strain to LPS; the activity of AIP disappeared completely after a mild periodate oxidation whereas that of LPS containing LAP was not lost by similar treatment. The primary antibody response to sheep erythrocytes was markedly augmented by an i.p. injection of AIP. AIP is apparently a potent adjuvant.