Shufeng Xingbi Therapy Modulates Th1/Th2 Balance and Gut Flora in Allergic Rhinitis Rats

Study Background and Research Question

Allergic rhinitis (AR) is a common chronic inflammatory disorder characterized by paroxysmal sneezing, nasal itching, congestion, and watery discharge, largely affecting children worldwide. The condition is primarily mediated by an IgE-driven hypersensitivity reaction upon allergen exposure, with a global prevalence exceeding 10% and rising steadily in recent decades. Current pharmacological treatments—such as glucocorticoids, antihistamines, and leukotriene receptor antagonists—offer symptomatic relief but are often associated with undesirable local and systemic side effects, especially in pediatric populations. There is growing recognition that the underlying pathogenesis of AR involves a dysregulated balance between Th1 and Th2 immune responses, as well as disruptions to the intestinal microbiota, which can further exacerbate allergic inflammation and immune dysfunction. Against this backdrop, the referenced study (Yan et al., 2025) investigates whether Shufeng Xingbi Therapy (SFXBT), a traditional Chinese medicine (TCM) regimen, can restore immune homeostasis and modulate gut microbial composition in an AR rat model.

Key Innovation from the Reference Study

The principal innovation of the Yan et al. study lies in its integrative approach—simultaneously evaluating the effects of SFXBT on both the Th1/Th2 immune axis and the intestinal microbiome in a controlled AR animal model. This dual-domain assessment allows for mechanistic insights into how modulation of mucosal immunity and gut microbial populations can converge to alleviate allergic inflammation. The study further leverages both systemic (oral) and local (nasal drop) administration of SFXBT, reflecting real-world TCM clinical practices and enabling a robust evaluation of its therapeutic potential.

Methods and Experimental Design Insights

The research employed 32 male Sprague-Dawley rats (6 weeks old, 200-250 g), randomly assigned to four groups: control, ovalbumin (OVA)-induced AR, antibiotic + SFXBT, and acetic acid + SFXBT. The AR model was established via repeated OVA sensitization and challenge, a well-validated protocol for mimicking human allergic rhinitis. SFXBT was administered both orally (Shufeng Xingbi recipe) and intranasally (Xingbi gel) to mirror clinical regimens. The study's methodology integrated a variety of assessment techniques, including:

• Behavioral scoring for AR symptom severity.
• Histopathological analysis of nasal mucosa using H&E staining.
• 16S rDNA sequencing to characterize colonic microbiota composition.
• Quantification of serum IgE, IL-4, and short-chain fatty acids (SCFAs) via ELISA.
• Measurement of STAT5, STAT6, and GATA3 mRNA levels in nasal mucosa using RT-qPCR.
• Protein expression analysis of IL-4, STAT5, STAT6, and GATA3 by Western blotting.

Protocol Parameters

• Animal model: 6-week-old male Sprague-Dawley rats, 200-250 g.
• AR induction: OVA sensitization and challenge protocol.
• SFXBT intervention: Oral Shufeng Xingbi recipe combined with intranasal Xingbi gel; dosing regimens as per traditional clinical use.
• Microbiota analysis: 16S rDNA sequencing of colonic contents.
• Immunological assays: Serum IgE and cytokine quantification by ELISA; mucosal mRNA/protein analysis by RT-qPCR and Western blot.

Core Findings and Why They Matter

Relative to the OVA-induced AR group, both the antibiotic + SFXBT and acetic acid + SFXBT groups exhibited significantly reduced AR behavioral scores and marked improvement in nasal mucosal pathology (P < 0.01). At the phylum level, SFXBT treatment led to a substantial increase in the relative abundance of Firmicutes and a decrease in Bacteroidetes, suggesting a shift toward a potentially more anti-inflammatory gut microbial profile. At the genus level, the relative abundance of Lactobacillus, Romboutsia, Allobaculum, and Dubosiella increased significantly. These genera are commonly associated with enhanced SCFA production and immunomodulatory effects.

Serum IgE and IL-4 levels were significantly reduced after SFXBT intervention (P < 0.05), while SCFA content in the colon increased, indicating a restoration of mucosal immune tolerance and anti-inflammatory signaling. Furthermore, the expression levels of STAT5, STAT6, and GATA3 mRNA and protein in the nasal mucosa were significantly downregulated, providing molecular evidence for rebalancing of the Th1/Th2 axis. These results collectively point to SFXBT's capacity to suppress allergic inflammation by both direct immunomodulation and indirect microbial remodeling (Yan et al., 2025).

Comparison with Existing Internal Articles

While the primary focus of the referenced study is on traditional herbal intervention, its methodology and findings resonate with contemporary molecular approaches that investigate the gut-immune interface. For instance, high-purity aminoglycoside antibiotics like Neomycin sulfate are frequently used in molecular biology research to manipulate intestinal microbiota and study downstream immunological effects. Internal resources such as "Neomycin Sulfate: Advanced Molecular Tool for Triplex DNA..." and "Neomycin Sulfate: Mechanistic Workflows for RNA/DNA & Ion..." discuss how aminoglycoside antibiotics, beyond their antimicrobial properties, facilitate the study of RNA/DNA structure interactions and modulation of ion channels. The referenced paper’s use of antibiotic pretreatment parallels these mechanistic applications, as both approaches leverage targeted modulation of the microbiome to probe immune outcomes. Furthermore, the ability of Neomycin sulfate to disrupt protein–nucleic acid interactions (e.g., disruption of HIV-1 Tat protein and TAR RNA interaction, DNA triplex structure stabilization) underscores the versatility of such compounds in both immunological and molecular workflows.

Limitations and Transferability

Despite its comprehensive design, the study has several limitations. The findings are based on a single animal model and may not fully translate to diverse human populations with AR. The use of combined oral and nasal SFXBT complicates attribution of effects to specific administration routes, and the direct mechanisms linking microbial shifts to immune modulation require further elucidation. Moreover, while 16S rDNA sequencing provides valuable taxonomic insights, functional analyses of microbial metabolites beyond SCFAs would strengthen mechanistic conclusions. The transferability of SFXBT protocols to other allergic or immune-mediated conditions remains speculative and should be validated in further preclinical and clinical studies.

Why this cross-domain matters, maturity, and limitations

This research bridges traditional herbal medicine with modern immunology and microbiome science. By demonstrating that modulation of the gut microbiota can influence mucosal immunity in allergic disease, it supports an emerging cross-domain paradigm: interventions targeting the microbiome—whether through antibiotics, prebiotics, or phytotherapeutics—may offer novel, less toxic avenues for immunomodulation. However, the maturity of this approach is still at the preclinical stage, and the limitations of animal models and single-center studies must be acknowledged. Direct clinical translation will require robust, multi-center investigations and mechanistic studies in human subjects.

Research Support Resources

For researchers aiming to dissect the mechanistic links between microbiota, immune regulation, and allergic inflammation, high-purity reagents are essential. Neomycin sulfate (SKU B1795) from APExBIO, as an aminoglycoside antibiotic, is widely used to manipulate gut microbial communities in animal models and to probe RNA/DNA structure interactions in molecular biology. Its well-characterized properties—including the ability to stabilize nucleic acid complexes and block ryanodine receptor channels—make it a valuable tool for studies requiring precise microbiome or immunological modulation. Researchers can refer to detailed protocol recommendations and mechanistic applications in internal resources such as "Neomycin Sulfate: Mechanistic Applications in RNA/DNA and Ion Channel Research". As always, rigorous experimental design and appropriate controls are crucial to ensure reproducibility and interpretability of results in this rapidly evolving field.