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Polygalasaponin XXXI (Onjisaponin F) is an effective adjuvant for intranasal administration of influenza Influenza hemagglutinin (HA) vaccine to protect influenza virus infection[1].

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[1].Polygalasaponin XXXI (Onjisaponin F) (1 or 10 μg/mL) also induces ChAT mRNA level in rat basal forebrain cells[2].

Intranasal vaccination with Polygalasaponin XXXI (Onjisaponin F) inhibits proliferation of mouse adapted influenza virus A/PR/8/34 in bronchoalveolar lavages of infected mice[1].

[1]. T Nagai, et al. Onjisaponins, From the Root of Polygala Tenuifolia Willdenow, as Effective Adjuvants for Nasal Influenza and Diphtheria-Pertussis-Tetanus Vaccines. Vaccine. 2001 Sep 14;19(32):4824-34. [2]. T Yabe, et al. Induction of NGF Synthesis in Astrocytes by Onjisaponins of Polygala Tenuifolia, Constituents of Kampo (Japanese Herbal) Medicine, Ninjin-yoei-to. Phytomedicine. 2003 Mar;10(2-3):106-14.

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