Modification of human immunodeficiency viral replication by pine cone extracts

Area of Science:

• Phytochemistry
• Virology
• Immunology

Background:

• Two fractions, PC6 and PC7, from Japanese white pine (Pinus parvifloria Sieb. et Zucc) cones previously demonstrated immunopotentiating effects.
• Human immunodeficiency virus type 1 (HIV-1) remains a significant global health challenge, necessitating novel therapeutic strategies.

Purpose of the Study:

• To investigate the anti-HIV-1 replication activity of PC6 and PC7 fractions.
• To evaluate the potential of these pine cone extracts as therapeutic agents for Acquired Immunodeficiency Syndrome (AIDS).

Main Methods:

• Assessing the dose-dependent inhibition of HIV-1 replication in chronically infected CR10/HIV-1 cells and acutely infected CEM cells.
• Evaluating the efficacy of PC6 treatment before and after HIV-1 infection in CEM cells.
• Testing PC6's inhibitory effect on HIV-1 replication in U937 human histiocytic lymphoma cells.
• Assessing the cytotoxicity of PC6 and PC7 on cells.

Main Results:

• PC6 and PC7 inhibited HIV-1 replication by over 95% in a dose-dependent manner.
• Pre- and post-infection treatment with PC6 in CEM cells yielded an 80% inhibition at 3 µg/ml.
• Similar potent inhibition was observed in U937 cells.
• PC6 and PC7 exhibited low toxicity to the tested cell lines.

Conclusions:

• PC6 and PC7 fractions from Japanese white pine possess significant anti-HIV-1 activity.
• The combination of anti-HIV-1 effects and previously reported immunopotentiating properties positions these compounds as promising candidates for AIDS therapy.