Objective: This study aimed to systematically evaluate the pharyngeal-clearing effects of five traditional Chinese medicinal extracts—Lonicerae Japonicae Flos(Jinyinhua), Chrysanthemi Flos(Juhua), Canarii Fructus(Qingguo), Phyllanthi Fructus(Yuganzi), and Platycodonis Radix(Jiegeng)—by employing classical anti-inflammatory models and serum inflammatory factor assays, thereby providing a pharmacodynamic basis for their application in throat-soothing healthcare products. Methods: A total of 220 SPF-grade Sprague-Dawley(SD) rats and 110 ICR mice were randomly assigned to 11 groups(n=10 per group): a model control group and high-and low-dose groups for each of the five medicinal extracts. All animals received continuous intragastric administration for 30 days. The doses for rats were set as follows: L. Japonicae Flos, C. Flos, and P. Fructus at 0.25 g·kg-1 and 0.13 g·kg-1(high and low dose, respectively); C. Fructus at 0.33 g·kg-1 and 0.17 g·kg-1; P. Radix at 0.17 g·kg-1 and 0.08 g·kg-1. Based on body surface area conversion, mouse doses were twice the corresponding rat doses. The model control group received an equal volume of sterile water. Anti-inflammatory efficacy was assessed using the rat paw edema test, mouse ear swelling test, and rat cotton pellet granuloma implantation test. Serum levels of inflammatory mediators, including interleukin-1α(IL-1α), IL-1β, IL-6, cyclooxygenase-2(COX-2), prostaglandin E2(PGE2), and histamine, were measured. Histopathological examinations were performed on granuloma tissue from rats and swollen ear tissue from mice. Data are presented as mean±standard deviation, and intergroup comparisons were analyzed by one-way ANOVA, with a significance threshold of P <0.05. Results: Compared with the model control group, all treatment groups showed significant reductions in granuloma net weight, rat paw swelling rate, and mouse ear swelling rate(P<0.05). Serum levels of IL-1α, IL-1β, IL-6, COX-2, PGE2, and histamine in the cotton pellet implantation model rats were decreased to varying degrees. With the exception of the high-dose P. Fructus group, these decreases were statistically significant in all other high-dose groups(P<0.05). Histopathological analysis revealed improvements relative to the model control group, including reduced inflammatory cell infiltration in granuloma tissue and decreased incidence and severity of sebaceous gland cell degeneration and vasodilation in mouse ear skin. Conclusion: The extracts of L. Japonicae Flos, C. Flos, C. Fructus, P. Fructus, and P. Radix possess significant pharyngeal-clearing and anti-inflammatory effects. These findings provide experimental evidence supporting their development and application in functional products aimed at soothing the throat. |
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