Laminins 2 and 4 are expressed by human decidual cells

Heather J. Church, Ljiljana M. Vićovac, Jason D L Williams, Neil A. Hey, John D. Aplin

    Research output: Contribution to journalArticlepeer-review

    Abstract

    During pregnancy, the resident stromal cells of the endometrium differentiate to become decidual cells and produce a pericellular basement membrane. We used immunofluorescence and Western blotting with a panel of monoclonal Ab specific for various laminin subunits to examine the composition of decidual laminin. The stromal cell basement membrane contained subunits α2 (M), β1 (B1), β2 (s), and γ1 (B2). Low levels of α1 could also be detected. The glandular and vascular basement membranes of decidual tissue contained subunits α1 (A), β1, and γ1. An extract was produced from decidual extracellular matrix. Western blots of nonreducing gels showed the presence of high molecular weight complexes containing α2, β1, β2, and γ1. These data indicated that laminins 2 and 4 are coexpressed by decidual cells. Laminin 1 was present in the extract as a minor component. In contrast, cultured stromal cells expressed laminin 1 as the major secreted variant. Immunolocalization was carried out using tissue from various stages of the nonpregnant cycle. The α2 chain polypeptide was absent in the proliferative phase of the cycle but present in late secretory phase in perivascular areas where predecidual differentiation occurs. Reverse transcriptase-PCR experiments confirmed the presence of α2 chain mRNA in decidua but showed that this transcript is detectable throughout the the nonpregnant cycle. The results showed that laminins 2 and 4 are hormonally regulated products of decidual cells. The composition of the vascular and epithelial basement membranes remained constant throughout the cycle.
    Original languageEnglish
    Pages (from-to)21-32
    Number of pages11
    JournalLaboratory Investigation
    Volume74
    Issue number1
    Publication statusPublished - Jan 1996

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