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Isolation of Primary Mouse Trophoblast Cells and Trophoblast Invasion Assay
10:28

Isolation of Primary Mouse Trophoblast Cells and Trophoblast Invasion Assay

Published on: January 8, 2012

Antibody reaction patterns in first trimester placenta: implications for trophoblast isolation and purity screening

A Blaschitz1, U Weiss, G Dohr

  • 1Institute of Histology and Embryology, Karl Franzens-University of Graz, Harrachgasse 21, Graz, A-8010, USA.

Placenta
|September 14, 2000
PubMed

Insights

This study developed a method to purify first-trimester trophoblast cells using specific antibodies. The protocol significantly increased trophoblast purity to over 98%, crucial for placental research.

Area of Science:

  • Immunology
  • Cell Biology
  • Reproductive Biology

Background:

  • Accurate isolation of first-trimester trophoblast cells is essential for studying early placental development and function.
  • Density gradient centrifugation alone yields impure trophoblast cell preparations, often containing up to 45% non-trophoblast cells.
  • Specific markers are needed for both identification and purification of trophoblast cells.

Purpose of the Study:

  • To establish an efficient purification protocol for first-trimester trophoblast cells using immunohistochemical and cytochemical methods.
  • To identify specific antibodies for selecting and screening purified trophoblast cells.
  • To assess the purity of isolated trophoblast cells after implementing the developed protocol.

Main Methods:

  • Immunohistochemical and cytochemical analysis of placental tissue using antibodies against cytokeratins (CK7), CD9, fibroblast-specific antigen (FSA), CD45RB, and macrophage markers (CD163, CD68, CD14).
  • Evaluation of antibody reactivity on different placental cell types, including trophoblasts, mesenchymal cells, and Hofbauer cells.
  • Application of immunodepletion using anti-FSA and anti-CD45RB antibodies on density gradient-isolated cells to enhance trophoblast purity.

Main Results:

  • Cytokeratin 7 (CK7) was identified as a specific marker for all trophoblast subpopulations, with no expression in placental mesenchymal cells.
  • Anti-FSA effectively depleted mesenchymal cells, while anti-CD163 showed specificity for Hofbauer cells.
  • Immunodepletion using anti-CD45RB and anti-FSA increased trophoblast purity to over 98% from initial preparations containing up to 45% non-trophoblast cells.

Conclusions:

  • Cytokeratin 7 is a reliable marker for identifying first-trimester trophoblasts.
  • A combination of density gradient centrifugation followed by immunodepletion with anti-CD45RB and anti-FSA antibodies is highly effective for purifying trophoblast cells.
  • The developed protocol provides a high degree of purity essential for subsequent analyses of isolated trophoblasts.

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