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Characterization of intraepithelial lymphocytes in human endometrium
D Pace1, M Longfellow, J N Bulmer
1Department of Pathology, University of Leeds, UK.
Insights
Intraepithelial lymphocytes (IELs) in the human endometrium change with the menstrual cycle and early pregnancy. These immune cells show distinct characteristics and numbers, differing from those found in the gut.
Area of Science:
- Immunology
- Reproductive Biology
- Cell Biology
Background:
- Intraepithelial lymphocytes (IELs) are immune cells found within epithelial tissues.
- Their role and characteristics in the human endometrium, particularly during pregnancy, require detailed investigation.
Purpose of the Study:
- To characterize and quantify intraepithelial lymphocytes (IELs) in normal non-pregnant human endometrium and early pregnancy decidua.
- To compare IEL populations across different stages of the menstrual cycle and early pregnancy.
Main Methods:
- Histological analysis using H & E and phloxine tartrazine stains.
- Immunohistochemistry with a panel of monoclonal antibodies and indirect immunoperoxidase technique.
- Quantification of granulated and non-granulated IELs and their surface:gland ratio.
Main Results:
- IEL populations varied significantly with menstrual cycle stage and early pregnancy.
- In early pregnancy, all observed IELs were granulated.
- Proliferative endometrium showed a higher IEL surface:gland ratio compared to secretory phase and early pregnancy.
- Proliferative endometrium IELs were predominantly CD8+ T cells, while first-trimester decidua had more CD56+ cells.
Conclusions:
- Endometrial IEL populations exhibit dynamic changes throughout the menstrual cycle and into early pregnancy.
- Phenotypic differences exist between endometrial IELs and those in the gastrointestinal tract.
- The distinct IEL profiles suggest specific roles in endometrial function and early pregnancy establishment.
Abstract:
Intraepithelial lymphocytes (IELs) were characterized and quantitated in normal non-pregnant endometrium and in early pregnancy decidua using H & E and phloxine tartrazine stains and a panel of monoclonal antibodies in an indirect immunoperoxidase technique. The relative numbers of granulated and non-granulated IELs varied according to menstrual cycle stage and in early pregnancy all IELs appeared to be granulated. There was a higher surface:gland ratio for IELs in proliferative endometrium compared with late secretory phase and early pregnancy endometrium. In proliferative endometrium most IELs were T cells, predominantly of the CD8 + subset. In first trimester decidua, higher numbers of CD56 + cells were observed, in keeping with the increased proportion of granulated IELs. IEL populations in human endometrium vary according to menstrual cycle stage and endometrial IELs appear to show phenotypic differences compared with IELs in the human gastrointestinal tract.