Maintenance of Barrier Tissue Integrity by Unconventional Lymphocytes.
Level 5 - mechanism / opinion, no new human data
Narrative review of mechanistic and preclinical studies without systematic methodology or new human clinical data.
PubMed 33936115 · doi:10.3389/fimmu.2021.670471
What was done
This narrative review summarizes literature examining how unconventional lymphocytes—specifically innate lymphoid cells (ILCs), γδ T cells, and mucosal-associated invariant T (MAIT) cells—control mucosal immune responses and facilitate barrier repair in the skin, gut, and lungs.
What was found
The abstract reports no quantitative data or effect sizes. It qualitatively describes findings that ILC2-derived amphiregulin and γδ T cell-derived fibroblast growth factors promote multi-site tissue repair, and that MAIT cells display pro-repair phenotypes that assist murine skin healing in a microbiota-dependent manner.
Why it matters
It emphasizes the non-redundant, protective roles of innate-like lymphocyte subsets in maintaining barrier integrity and accelerating tissue repair after mucosal injury.
Limits
The paper is a narrative review presenting no systematic search protocol, quantitative synthesis, or original human clinical trial data; reported mechanisms rely in part on murine models.
Cited by
- supports The innate immune system is concentrated primarily in barrier tissues like the gut mucosa and the pulmonary system.