Immunomodulatory and antitumour bioactive labdane diterpenoids from Leonurus japonicus. - GreenMedInfo Summary
Immunomodulatory and antitumour bioactive labdane diterpenoids from Leonurus japonicus.
J Pharm Pharmacol. 2020 Nov ;72(11):1657-1665. Epub 2020 Aug 5. PMID: 32757490
Grace Gar-Lee Yue
OBJECTIVES: Two labdane diterpenoids, leojapone B and heteronone B, were isolated from Leonurus japonicus Houtt., and their biological activity were evaluated in this study.
METHODS: Human and mouse cancer cells, human peripheral blood mononuclear cells (PBMCs) and mouse macrophages (RAW264.7 cells) were used to evaluate the activity of leojapone B and heteronone B, while the in vivo effects of leojapone B were further examined in Lewis Lung Cancer tumour-bearing mice.
KEY FINDINGS: In vitro studies showed that leojapone B selectively inhibited the proliferation of lung cancer cells, and both leojapone B and heteronone B inhibited the production of pro-inflammatory cytokines in activated PBMCs. In tumour-bearing mice model, lung tumours were reduced in size in mice treated with intraperitoneal injections of leojapone B at 20 and 30 mg/kg for 14 days. The population ratio of CD4/CD8T cells in mouse spleens was found to be increased, while regulatory T cells were decreased after leojapone B treatment.
CONCLUSIONS: The inhibitory effects of leojapone B in mouse lung tumours were demonstrated for the first time in this study. The immunomodulatory activity of heteronone B were also demonstrated. Our findings indicated that both leojapone B and heteronone B may act as active components in L. japonicus.