FAQ
Q: Why can't mucosal immunity research rely solely on measuring TNF-α/IL-6?
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A: Because the key to mucosal immunity lies not only in the "intensity of
inflammation" but also in Barrier Integrity Whether the specific defense (Th17/IL-22 and sIgA) is
established. Measuring only pro-inflammatory factors can easily miss the core mechanistic clues of
"barrier leakage" or "insufficient defense."
Q: How to quickly determine if the "barrier may be compromised/permeability is increased"?
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A: Can be used first LBP + sCD14 Conduct initial screening as a prompt
for "microbial component exposure-related background"; if combined with IL-6/TNF-α, it helps determine
whether it is linked to inflammation. Tight junction regulation and barrier impairment are important
mechanistic backgrounds.
Q: Can Zonulin serve as direct evidence of "leaky gut"?
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A: It is not advisable to treat Zonulin as a single, definitive "proof of
leaky gut." It is more suitable as an "auxiliary reading related to barrier regulation" and should be
interpreted comprehensively in conjunction with other barrier/inflammatory signals and model
evidence.
Q: Why is the Th17/IL-22 axis so important in the mucosa?
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A: IL-17A and IL-22 are closely related to mucosal defense: they can promote
the production of antimicrobial peptides, support barrier function, and participate in immune defense,
but they may also drive inflammatory pathology under specific conditions. Therefore, "whether to
activate and to what extent" is crucial.
Q: Why is it recommended to add IL-23 to the enhanced version of the Th17 axis?
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A: IL-23 is one of the critical upstream factors for the maintenance and
expansion of Th17 responses. The addition of IL-23 helps link "effector outputs (IL-17/IL-22)" with
"upstream maintenance signals," thereby enhancing the mechanistic interpretability of intergroup
comparisons.
Q: Does seeing an increase in sIgA mean that "protective immunity has been established"?
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A: sIgA elevation is an important signal, but whether it provides
"protection" depends on antigen specificity, the time window, and functional outcomes. The classic roles
of sIgA include immune exclusion and homeostasis maintenance, and it is recommended to interpret it
alongside infection load, histology, or functional endpoints.
Q: How to choose sample type: serum vs lavage fluid/saliva/BALF?
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A:
- Serum/Plasma More suitable for systematic trend and cohort comparisons
(barrier exposure background, systemic inflammation).
- Irrigation fluid/secretions Closer to the mucosal local (sIgA, local
chemotaxis/inflammatory signals)
- Tissue homogenate More suitable for observing local barriers and
inflammatory microenvironment (pay attention to normalization and matrix interference).
