Tuft Cell Functionality in Mucosal Immunity

Tuft cells are specialised chemosensory epithelial cells dispersed throughout mucosal surfaces, notably in the intestinal and respiratory tracts. Equipped with apical microvilli and an array of taste-receptor pathways, they detect luminal metabolites and microbial signals such as succinate and helminth-derived products. Upon activation, tuft cells secrete a repertoire of effector molecules—interleukin-25, prostaglandins, leukotrienes and acetylcholine—that orchestrate type 2 immune circuits. A critical axis exists between tuft cells and type 2 innate lymphoid cells (ILC2), whereby tuft cell-derived interleukin-25 drives ILC2 proliferation and cytokine release, in turn promoting epithelial remodelling and barrier reinforcement. Beyond homeostasis, tuft cell dysregulation has been implicated in metaplastic transformation, tumourigenesis and infections, positioning them as both sentinels and potential therapeutic targets in mucosal immunity.

Research from Nature Portfolio

Recent studies have delineated the fine-tuning mechanisms by which tuft cells regulate interleukin-25 bioavailability and thereby calibrate ILC2 activity. Investigations into IP₃R2-mediated calcium flux reveal that tuft cell expression of IL-17RB restrains excessive IL-25 secretion, preventing tonic overstimulation of ILC2s and averting a hypoproliferative state under chronic challenge. This regulatory loop ensures balanced type 2 responses across diverse luminal conditions.

Complementary work has uncovered a feed-forward circuit in the gastric epithelium, wherein tuft cell-derived interleukin-25 activates ILC2 to secrete interleukin-13, driving epithelial tuft cell hyperplasia. This circuit, while evolutionarily adapted for anti-helminthic defence, can promote gastric metaplasia and tumour development when chronically engaged. Genetic or antibody-mediated disruption of interleukin-25 or interleukin-13 attenuates metaplastic progression, highlighting avenues for early-stage therapeutic intervention in gastric cancer.

Research from all publishers

A comprehensive review has synthesised the expanding landscape of intestinal tuft cell biology, emphasising their role as immunological hubs. Tuft cells monitor luminal content via succinate sensors and taste-receptor pathways, and upon stimulation release interleukin-25, prostaglandins E₂ and D₂, cysteinyl leukotrienes, acetylcholine and thymic stromal lymphopoietin. These mediators collectively orchestrate anti-helminthic and anti-protozoan immunity, modulate mucosal barrier integrity and may influence inflammatory disorders and cancer in humans.

Investigations into the taste-receptor TAS1R3 have revealed its pivotal influence on tuft cell homeostasis in the distal small intestine. Mice lacking functional TAS1R3 exhibit severely impaired tuft cell expansion in response to protozoan and succinate stimuli, yet mount normal responses to proximal intestinal helminths. These findings suggest that differential chemosensory pathways shape regional tuft cell responses and thereby sculpt epithelial immune landscapes.

Foundational work on tuft cell specification has elucidated the molecular determinants of their differentiation within the intestinal epithelium. Key transcription factors govern lineage commitment to the tuft cell fate, a process that remains challenging to delineate owing to the rarity of these cells. Understanding this developmental programme is critical for unravelling tuft cell functions in health and disease.

Tuft Cell Functionality in Mucosal Immunity publication trend

The graph below shows the total number of articles in tuft cell functionality in mucosal immunity across all publications each year (not limited to Nature Index journals).

Technical terms

Tuft cell: Rare chemosensory epithelial cell with apical microvilli that senses luminal signals and orchestrates mucosal immune responses.

Type 2 innate lymphoid cell (ILC2): Innate immune cell that produces type 2 cytokines and mediates responses to helminths and allergens.

Interleukin-25 (IL-25): Type 2 cytokine produced by tuft cells that activates ILC2 and promotes type 2 immunity.

IL-17 Receptor B (IL-17RB): Receptor subunit on tuft cells and ILC2 that modulates IL-25 bioavailability and immune activation.

Succinate: Microbially derived metabolite recognised by tuft cells to trigger effector secretion and immune circuit activation.

References

1. Tuft cell IL-17RB restrains IL-25 bioavailability and reveals context-dependent ILC2 hypoproliferation. Nature Immunology (2025).
2. A tuft cell - ILC2 signaling circuit provides therapeutic targets to inhibit gastric metaplasia and tumor development. Nature Communications (2023).
3. Tuft Cells and Their Role in Intestinal Diseases. Frontiers in Immunology (2022).
4. The Taste Receptor TAS1R3 Regulates Small Intestinal Tuft Cell Homeostasis. ImmunoHorizons (2020).
5. The intestinal epithelium tuft cells: specification and function. Cellular and Molecular Life Sciences (2012).