Defined Small Molecules Produced by Himalayan Medicinal Plants Display Immunomodulatory Properties

Area of Science:

• Phytochemistry
• Immunology
• Pharmacology

Background:

• Plant-derived compounds are increasingly recognized for their therapeutic potential in treating cancer, infectious diseases, and autoimmune disorders.
• Bhutanese Sowa Rigpa medicinal plants represent a rich source of novel phytochemicals with potential biological activities.

Purpose of the Study:

• To isolate and characterize phytochemicals from Bhutanese medicinal plants.
• To evaluate the immunomodulatory and cytotoxic properties of purified compounds.

Main Methods:

• Isolation of 40 phytochemicals from five Bhutanese medicinal plants.
• Testing 14 purified compounds for immunomodulatory effects on murine dendritic cells (DCs).
• Assessing cytotoxicity against a human cholangiocyte cell line using real-time cell monitoring.

Main Results:

• Scoulerine demonstrated adjuvant-like properties, significantly upregulating MHC-I expression.
• Bergapten exhibited immunosuppressive effects, downregulating MHC-I and co-stimulatory molecule expression.
• Both scoulerine and bergapten showed low cytotoxicity against normal cells.

Conclusions:

• Defined compounds from Bhutanese medicinal plants possess significant immunomodulatory potential.
• Scoulerine and bergapten modulate dendritic cell activity, highlighting their therapeutic promise for immune-related diseases.