Distribution of Interleukin-22–secreting Immune Cells in Conjunctival Associated Lymphoid Tissue
Korean Journal of Ophthalmology
;
: 147-153, 2018.
Article
in English
| WPRIM
| ID: wpr-713841
ABSTRACT
PURPOSE:
Interleukin (IL)-22 is a cytokine involved in epithelial cell regeneration. Currently, no research studies have analyzed the distribution of the three distinct IL-22–secreting cell populations in human or mouse conjunctiva. This study investigated the distribution of the three main populations of IL-22–secreting immune cells, αβ Th cells, γδ T cells, or innate cells (innate lymphoid cells [ILCs] or natural killer cells), in conjunctival associated lymphoid tissues (CALTs) in human and mouse models.METHODS:
We collected discarded cadaveric bulbar conjunctival tissue specimens after preservation of the corneo-limbal tissue for keratoplasty from four enucleated eyes of the domestic donor. The bulbar conjunctiva tissue, including the cornea from normal (n = 27) or abraded (n = 4) B6 mice, were excised and pooled in RPMI 1640 media. After the lymphoid cells were gated in forward and side scattering, the αβ Th cells, γδ T cells, or innate lymphoid cells were positively or negatively gated using anti-CD3, anti-γδ TCR, and anti–IL-22 antibodies, with a FACSCanto flow cytometer.RESULTS:
In normal human conjunctiva, the percentage and number of cells were highest in αβ Th cells, followed by γδ T cells and CD3–γδ TCR – IL-22+ innate cells (presumed ILCs, pILCs) (Kruskal-Wallis test, p = 0.012). In normal mice keratoconjunctiva, the percentage and total number were highest in γδ T cells, followed by αβ Th cells and pILCs (Kruskal-Wallis test, p = 0.0004); in corneal abraded mice, the population of αβ Th cells and pILCs tended to increase.CONCLUSIONS:
This study suggests that three distinctive populations of IL-22–secreting immune cells are present in CALTs of both humans and mice, and the proportions of IL-22+αβ Th cells, γδ T cells, and pILCs in CALTs in humans might be differently distributed from those in normal mice.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Regeneration
/
Tissue Donors
/
Cadaver
/
Lymphocytes
/
T-Lymphocytes
/
Corneal Transplantation
/
Interleukins
/
Conjunctiva
/
Cornea
/
Epithelial Cells
Limits:
Animals
/
Humans
Language:
English
Journal:
Korean Journal of Ophthalmology
Year:
2018
Type:
Article
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