Casticin

The bulk of casticin’s literature — apoptosis with G2/M or G0/G1 arrest across glioma ^{5Reference 5Liu E et al. · 2013Casticin induces human glioma cell death through apoptosis and mitotic arrestView study →}, leukemia ^{6Reference 6Shen JK et al. · 2009Casticin induces leukemic cell death through apoptosis and mitotic catastropheView study →}, gallbladder ^{10Reference 10Song XL et al. · 2017Casticin induces apoptosis and G0/G1 cell-cycle arrest in gallbladder cancer cellsView study →}, breast, esophageal, oral, hepatocellular, ovarian and lung lines, consolidated in dedicated reviews ^{1,2Reference 1Chan EWC et al. · 2018ReviewCasticin from Vitex species: a short review on its anticancer and anti-inflammatory propertiesView study →Reference 2Ramchandani S et al. · 2020An overview of the potential antineoplastic effects of casticinView study →}. Mechanistically it is a tubulin-binding agent driving mitotic arrest and catastrophe ^{4Reference 4Haïdara K et al. · 2006The flavonoid casticin has multiple mechanisms of tumour cytotoxicity (a tubulin-binding agent)View study →}, it suppresses STAT3 (sensitizing cells to radiation) ^{7Reference 7Lee JH et al. · 2019Casticin inhibits growth and enhances ionizing-radiation-induced apoptosis through suppression of the STAT3 signalling cascadeView study →} and activates FOXO3a (via AMPK, and by repressing FoxM1) ^{8,9Reference 8Gong Q et al. · 2018Casticin suppresses the carcinogenesis of small-cell lung cancer H446 cells through AMPK/FoxO3a signallingView study →Reference 9He L et al. · 2013Casticin induces growth suppression and cell-cycle arrest through activation of FOXO3a in hepatocellular carcinomaView study →}, with intrinsic Bcl-2↓/Bax apoptosis retained even in p53-null cells; in-vivo support includes growth inhibition of oral-cancer SCC-4 xenografts ^{11Reference 11Shang HS et al. · 2020AnimalCasticin inhibits the in-vivo growth of xenograft tumours of human oral cancer SCC-4 cellsView study →}.

Gap: overwhelmingly in-vitro at µM concentrations, with only small in-vivo studies and no human isolate data — the tumor-line breadth is real but hypothesis-generating, not clinical ^{1,4Reference 1Chan EWC et al. · 2018ReviewCasticin from Vitex species: a short review on its anticancer and anti-inflammatory propertiesView study →Reference 4Haïdara K et al. · 2006The flavonoid casticin has multiple mechanisms of tumour cytotoxicity (a tubulin-binding agent)View study →}.

Casticin blunted cigarette-smoke-induced acute lung inflammation in vivo ^{12Reference 12Lee H et al. · 2015Casticin, an active compound from Vitex fructus, ameliorates cigarette-smoke-induced acute lung inflammationView study →} and inhibited eosinophil migration and chemokine/adhesion-molecule expression in lung epithelial cells ^{13Reference 13Koh DJ et al. · 2011Inhibitory effects of casticin on eosinophil migration and expression of chemokines and adhesion molecules in A549 lung epithelial cellsView study →}, with NF-κB inhibition the recurring mechanism — the activity the chaste-tree notes originally attributed to casticin.

Gap: cell and small-rodent models only, with no human data (and a prominent COPD/NF-κB paper in this space is retracted and deliberately excluded here) ^{12,13Reference 12Lee H et al. · 2015Casticin, an active compound from Vitex fructus, ameliorates cigarette-smoke-induced acute lung inflammationView study →Reference 13Koh DJ et al. · 2011Inhibitory effects of casticin on eosinophil migration and expression of chemokines and adhesion molecules in A549 lung epithelial cellsView study →}.

Casticin/vitexicarpin shows bidirectional immune effects — it enhanced innate macrophage and NK-cell activity with improved survival in a leukemia mouse model ^{14Reference 14Lai KC et al. · 2019AnimalCasticin promotes immune responses, enhances macrophage and NK-cell activities and increases survival in leukemia BALB/c miceView study →}, yet suppresses mitogen-driven lymphocyte proliferation ^{15Reference 15You KM et al. · 1998AnimalVitexicarpin, a flavonoid from the fruits of Vitex rotundifolia, inhibits mouse lymphocyte proliferationView study →}.

Gap: two small preclinical models pulling in opposite directions, with no coherent human immunopharmacology ^{14,15Reference 14Lai KC et al. · 2019AnimalCasticin promotes immune responses, enhances macrophage and NK-cell activities and increases survival in leukemia BALB/c miceView study →Reference 15You KM et al. · 1998AnimalVitexicarpin, a flavonoid from the fruits of Vitex rotundifolia, inhibits mouse lymphocyte proliferationView study →}.

Vitexicarpin from Vitex trifolia is a classic tracheospasmolytic (bronchodilator) finding ^{16Reference 16Alam G et al. · 2002Tracheospasmolytic activity of viteosin-A and vitexicarpin isolated from Vitex trifoliaView study →}, and casticin has surfaced as a screening hit in botanical antiviral work.

Gap: isolated screening/classic observations with no follow-through — mention-worthy breadth, not an evidence base ^{16Reference 16Alam G et al. · 2002Tracheospasmolytic activity of viteosin-A and vitexicarpin isolated from Vitex trifoliaView study →}.