ArticleFrontiers in allergy2026
A sensitive colorimetric ELISA to measure allergen-specific salivary SIgA for monitoring sublingual immunity efficiency in pollinosis SLIT.
Article in Frontiers in allergy, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Sublingual immunotherapy (SLIT) is safe and one of the most effective etiological treatment for pollinosis. Allergen-specific salivary secretory immunoglobulin A (SIgA) is a useful marker to objectively evaluate treatment efficacy. However, saliva samples usually exhibit high background noise because of non-specific binding in enzyme-linked immunosorbent assays (ELISAs). We therefore aimed to establish an amplified ELISA to measure allergen-specific salivary SIgA levels to assess the efficacy of SLIT for Japanese cedar pollinosis. Methods: Biotinyl-tyramide (BT-Tyr) was used to amplify the signal in a colorimetric ELISA. The allergen of Japanese cedar pollen, Sugi basic protein (SBP), was biotinylated and used as a reporter to obtain sensitive and specific results with low background. To obtain preliminary observations, we applied this ELISA for measuring anti-SBP SIgA levels in saliva samples from SLIT-treated patients with Japanese cedar pollinosis. Results: The ELISA was highly sensitive and achieved more than 200-fold signal amplification compared with non-amplified conditions. It was also specific for antigens without background noise. The levels of SBP-specific SIgA in saliva increased in patients 9 months after SLIT initiation at the latest. Conclusions: We developed a sensitive colorimetric ELISA to measure SBP-specific SIgA in saliva using BT-Tyr-based amplification and biotinylated antigen as a reporter. We successfully applied this sensitive ELISA to monitor the levels of SBP-specific SIgA in saliva samples from patients with pollinosis receiving SLIT. Increased salivary SBP-specific SIgA levels were observed in these patients.
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