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Group 3 innate lymphoid cells in intestinal health and disease
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Journal Article
Group 3 innate lymphoid cells in intestinal health and disease
2024
Overview
The gastrointestinal tract is an immunologically rich organ, containing complex cell networks and dense lymphoid structures that safeguard this large absorptive barrier from pathogens, contribute to tissue physiology and support mucosal healing. Simultaneously, the immune system must remain tolerant to innocuous dietary antigens and trillions of normally beneficial microorganisms colonizing the intestine. Indeed, a dysfunctional immune response in the intestine underlies the pathogenesis of numerous local and systemic diseases, including inflammatory bowel disease, food allergy, chronic enteric infections or cancers. Here, we discuss group 3 innate lymphoid cells (ILC3s), which have emerged as orchestrators of tissue physiology, immunity, inflammation, tolerance and malignancy in the gastrointestinal tract. ILC3s are abundant in the developing and healthy intestine but their numbers or function are altered during chronic disease and cancer. The latest studies provide new insights into the mechanisms by which ILC3s fundamentally shape intestinal homeostasis or disease pathophysiology, and often this functional dichotomy depends on context and complex interactions with other cell types or microorganisms. Finally, we consider how this knowledge could be harnessed to improve current treatments or provoke new opportunities for therapeutic intervention to promote gut health.
Here, an overview of group 3 innate lymphoid cells (ILC3s) is provided in gastrointestinal health and disease, highlighting their role in tissue physiology, immunity, inflammation and cancer. The biology and physiological function of ILC3s are described across different states and diseases along with a discussion on opportunities for therapeutic targeting.
Key points
Group 3 innate lymphoid cells (ILC3s) have emerged as critical orchestrators of intestinal health and disease.
At homeostasis, ILC3s instruct lymphoid tissue organogenesis and persist throughout life to protect from enteric pathogens whilst supporting barrier integrity and tolerance towards microbiota and dietary antigens.
A balance between ILC3s and adaptive immune responses is essential to protect from enteric pathogens and promote immune regulation, whereas disruption of ILC3s unleashes chronic gut inflammation.
Dysregulation of ILC3s also contributes to experimental intestinal inflammation and cancer but critically depends on contextual factors such as the presence of adaptive immunity and disease timepoint.
Gut-protective ILC3s are dramatically reduced in both inflammatory bowel disease and colorectal cancer, whereas the remaining cells show increased plasticity towards inflammatory phenotypes.
Modulating ILC3 numbers or function could considerably improve gastrointestinal health by limiting inflammation, promoting mucosal healing or supporting antitumour responses.
Publisher
Nature Publishing Group UK,Nature Publishing Group
