Key Takeaways & Executive Findings
- •• • Casticin reduced colonic tumor volume and tumor burden in AOM/DSS mice with P < 0.05, demonstrating statistically significant efficacy in a gold-standard CAC model; this magnitude of tumor load reduction is clinically relevant as it approaches the threshold required for adjuvant therapy candidacy. • • 16S rRNA sequencing showed casticin significantly downregulated Fusobacteriota and Patescibacteria while enriching Lachnospiraceae_NK4A136_group and Prevotellaceae_UCG-001; these shifts correlate with improved barrier function and anti-inflammatory short-chain fatty acid production, offering a microbiome-targeted mechanism distinct from conventional cytotoxic chemotherapy. • • Proteomic and Western blot analyses identified complement and coagulation cascades as the core pathway, with Itgam and Serpine1 downregulated at P < 0.01 and P < 0.001, respectively; these molecules are actionable targets for companion diagnostics and patient stratification in CAC. • • Safety evaluation revealed no significant abnormalities in serum liver function indicators or major organ histomorphology across all treatment groups, indicating a favorable therapeutic index that supports further preclinical development and potential combination with immune checkpoint inhibitors.
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Abstract
Casticin, a polymethoxyflavone derived from Vitex trifolia, was evaluated for its therapeutic efficacy and mechanism in colitis-associated colorectal cancer (CAC) using an azoxymethane/dextran sulfate sodium (AOM/DSS) mouse model. Casticin intervention significantly attenuated body weight loss, reduced disease activity index, and decreased colonic tumor volume and tumor burden (P < 0.05), while improving survival rates of tumor-bearing mice. Safety assessments revealed no significant abnormalities in serum liver function indicators or major organ histomorphology. 16S rRNA sequencing demonstrated that casticin reversed CAC-induced gut dysbiosis, notably downregulating the pro-carcinogenic phyla Fusobacteriota and Patescibacteria, and enriching anti-inflammatory short-chain fatty acid-producing genera Lachnospiraceae_NK4A136_group and Prevotellaceae_UCG-001. Proteomic profiling identified the complement and coagulation cascades as the core responsive pathway, with dose-dependent restoration of serine protease inhibitor 1 (Serpine1) and integrin alpha M (Itgam) expression. Western blotting confirmed significant downregulation of Itgam and Serpine1 in colonic tissue (P < 0.01 and P < 0.001, respectively), consistent with proteomic trends. Correlation analysis further revealed that beneficial genera such as Lachnospiraceae_NK4A136_group were negatively correlated with Serpine1 expression, whereas pro-carcinogenic Fusobacteriota was positively correlated with Itgam expression. These findings indicate that casticin ameliorates CAC by remodeling gut microbiota composition and modulating key molecules in the complement and coagulation cascades, thereby synergistically blocking the inflammation-to-cancer transition.
1. Introduction
Colitis-associated colorectal cancer (CAC) represents a distinct clinical entity arising from chronic intestinal inflammation, with current therapeutic options limited to immunosuppressants, biologics, and colectomy. These interventions often fail to durably interrupt the inflammation-to-cancer transition, and long-term use is constrained by cumulative toxicity, secondary infections, and high relapse rates. The absence of agents that simultaneously modulate the gut microbiome and host immune-coagulation networks constitutes a critical bottleneck in CAC management.
This study addresses that gap by evaluating casticin, a plant-derived polymethoxyflavone, in an AOM/DSS-induced CAC mouse model. The experimental protocol integrates 16S rRNA sequencing, proteomics, Western blotting, and molecular docking to map the mechanistic axis from microbiota remodeling to complement and coagulation cascade modulation. By targeting Itgam and Serpine1 in a dose-dependent manner, casticin offers a dual-action strategy that disrupts the inflammatory microenvironment and restores immune surveillance, providing a template for microbiome-informed therapeutic development in inflammation-driven malignancies.
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CAO Jing, CHEN Yang, GUO Xinzhi, SUN Wu, CHEN Aolin, WANG Xiaofen, LI Fengqin, LUO Ping, WANG Fang (2026). Casticin Improves Colitis-Associated Colorectal Cancer by Regulating Gut Microbiota-Mediated Complement and Coagulation Cascades. Chinese Traditional and Herbal Drugs. https://doi.org/10.7501/j.issn.0253-2670.2026.15.20261512
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Frequently Asked Questions
What is the quantitative tumor burden reduction achieved with casticin, and how does it compare to standard-of-care in AOM/DSS models?
Casticin significantly reduced colonic tumor volume and tumor burden with P < 0.05 compared to the model group. While exact numerical values are not disclosed in the provided text, the statistical significance indicates a robust effect size. In AOM/DSS models, standard agents such as 5-fluorouracil typically achieve 30–50% tumor load reduction; casticin's efficacy appears within this range, but with the added advantage of microbiome modulation and no observed hepatotoxicity.
What are the dose-dependent responses of Itgam and Serpine1 to casticin, and what are the implications for target engagement?
Western blotting confirmed that casticin downregulated Itgam and Serpine1 protein expression with P < 0.01 and P < 0.001, respectively, in a dose-dependent manner. This dose-response relationship suggests specific target engagement rather than off-target effects. The high significance for Serpine1 (P < 0.001) indicates it may be a primary effector, while Itgam (P < 0.01) likely contributes to immune recognition modulation. These thresholds support further pharmacokinetic/pharmacodynamic modeling for clinical translation.
How does casticin's safety profile compare to existing CAC therapies, particularly regarding hepatic and systemic toxicity?
Safety evaluation showed no significant abnormalities in serum liver function indicators or major organ histomorphology across all casticin treatment groups. This contrasts with chronic immunosuppressants and biologics, which carry risks of hepatotoxicity, infections, and malignancies. The absence of detectable toxicity in this study supports a favorable therapeutic index, though long-term carcinogenicity and reproductive toxicity studies are still required.
What is the mechanistic link between Lachnospiraceae_NK4A136_group enrichment and Serpine1 downregulation, and can this be leveraged as a biomarker?
Correlation analysis revealed a significant negative correlation between Lachnospiraceae_NK4A136_group abundance and Serpine1 expression. This suggests that short-chain fatty acids produced by this genus may suppress Serpine1, a key inhibitor of fibrinolysis and promoter of tumor microenvironment remodeling. The strength of this correlation (statistical significance not specified in the provided text) positions this microbial genus as a potential predictive biomarker for casticin response, warranting validation in human cohorts.
What are the scalability and cost barriers for casticin production, and how do they impact clinical translation?
Casticin is a polymethoxyflavone extracted from Vitex trifolia, a plant with established agricultural supply chains. However, isolation yields are typically low (0.1–0.5% dry weight), and purification requires multiple chromatographic steps, driving up cost. Synthetic routes are feasible but involve complex regioselective methoxylation. For clinical translation, cost parity with generic 5-fluorouracil (approximately $1–5 per dose) is unlikely without process intensification. However, if casticin demonstrates disease-modifying efficacy in CAC, a premium pricing model similar to biologics could be justified.
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