Kaempferitrin induces immunostimulatory effects in vitro

Area of Science:

• Pharmacology
• Immunology
• Ethnobotany

Background:

• Justicia spicigera is traditionally used in Mexican medicine for its immunostimulatory properties.
• Kaempferitrin (KM) has been identified as the major active compound in Justicia spicigera extracts.
• This research establishes a link between the traditional use of the plant and the effects of kaempferitrin.

Purpose of the Study:

• To investigate the in vitro immunostimulatory effects of kaempferitrin (KM).
• To evaluate KM's impact on various immune cell types, including splenocytes, macrophages, and peripheral blood mononuclear cells (PBMC).
• To assess KM's influence on specific immune functions like NO production, lysosomal enzyme activity, and NK cell activity.

Main Methods:

• In vitro assays were performed to assess the effects of KM on immune cell proliferation.
• Murine macrophages (RAW 264.7) were used to evaluate KM's effects on NO production, lysosomal enzyme activity, and pinocytosis.
• Natural Killer (NK) cell activity was also measured in response to KM treatment.

Main Results:

• KM significantly increased the proliferation of murine macrophages, splenocytes, and human PBMC, even without lipopolysaccharides (LPS).
• KM demonstrated potent stimulation of pinocytosis and lysosomal enzyme activity in murine macrophages, comparable to LPS.
• KM was found to enhance natural killer (NK) cell activity.

Conclusions:

• Kaempferitrin (KM) exhibits significant immunostimulatory effects.
• KM positively influences immune responses mediated by splenocytes, macrophages, PBMC, and NK cells.
• The findings support the traditional medicinal use of Justicia spicigera and highlight kaempferitrin as a key active compound.