Polygalasaponin XXXI (Onjisaponin F) is an effective adjuvant for intranasal administration of influenza Influenza hemagglutinin (HA) vaccine to protect influenza virus infection.In Vitro: Polygalasaponin XXXI (Onjisaponin F) also enhances anti-HA IgA and IgG Ab titers in the nasal wash, whereas Onjisaponins E and G enhances only anti-HA IgA Ab titer significantly. Polygalasaponin XXXI can induce protective immunity against intranasal infection by influenza virus.
Polygalasaponin XXXI (Onjisaponin F) (1 or 10 μg/mL) also induces ChAT mRNA level in rat basal forebrain cells[2].In Vivo: Intranasal vaccination with Polygalasaponin XXXI (Onjisaponin F) inhibits proliferation of mouse adapted influenza virus A/PR/8/34 in bronchoalveolar lavages of infected mice.