Interferon stimulated gene 15 expression at the human embryo-maternal interface.

Area of Science:

• Immunology
• Developmental Biology
• Reproductive Science

Background:

• Early pregnancy involves crucial maternal-embryo communication for successful decidualization and placental formation.
• Decidual Interferon-stimulated gene 15 (ISG15) induction is vital for pregnancy maintenance and development.
• ISG15 participates in essential cellular processes including RNA splicing, cytoskeletal organization, and stress response.

Purpose of the Study:

• To investigate the spatiotemporal expression patterns of ISG15 in human placental and decidual tissues throughout pregnancy.
• To determine the role of ISG15 in early placental development and its potential implications for pregnancy outcomes.

Main Methods:

• Immunohistological analysis of ISG15 expression in human placental and decidual tissues from all three trimesters.
• Utilized rabbit polyclonal ISG15 antibody and mouse monoclonal cytokeratin seven antibody for specific cell and tissue identification.
• Blind evaluation of staining results and anatomical features using strict rating criteria.

Main Results:

• ISG15 expression was detected in first and second trimester placental and decidual tissues.
• ISG15 localized to extravillous cytotrophoblasts, maternal blood vessels, placental villi, and the cell column, peaking in the first trimester.
• No ISG15 expression was observed in third trimester samples, while the syncytial layer showed positive staining in the first and second trimesters.

Conclusions:

• ISG15 is significantly abundant in the early human placenta, suggesting a role in placental development, fetal growth, and defense against infections.
• Maximal ISG15 expression in the first and second trimesters indicates its importance during critical periods of rapid embryonic development and heightened susceptibility.
• ISG15 function is likely essential when placental and embryonic development is extensive and the embryo is vulnerable to external factors.