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Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas
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Association of PAT proteins with lipid storage droplets in term fetal membranes

W E Ackerman1, J M Robinson, D A Kniss

  • 1Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine and Laboratory of Perinatal Research, The Ohio State University, College of Medicine, Columbus, OH 43210, USA.

Placenta
|September 13, 2006
PubMed

Insights

Lipid storage droplets (LDs) in fetal membranes associate with specific PAT proteins, varying by cell type. This suggests specialized functions for these lipid depots during pregnancy.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Reproductive Biology

Background:

  • Lipid storage droplets (LDs) are neutral lipid depots crucial for cellular energy homeostasis.
  • The PAT (perilipin, adipose differentiation-related protein, tail-interacting protein of 47 kilodaltons) family proteins are key regulators of LDs.
  • The role of PAT proteins in fetal membrane LDs is largely uncharacterized.

Purpose of the Study:

  • To investigate the association of PAT proteins with LDs in different cell types of term human fetal membranes.
  • To determine if PAT protein localization correlates with LD characteristics and cell type.

Main Methods:

  • Immunohistochemistry and immunofluorescence to detect PAT proteins (perilipin, ADRP, TIP47) and neutral lipids in fetal membrane tissues.
  • Analysis of gene and protein expression levels.

Main Results:

  • Large LDs in amnion epithelial cells were coated with ADRP and TIP47, but not perilipin.
  • ADRP and TIP47 were co-localized on LDs in other cell types, with TIP47 found in the cytoplasm of cells with small LDs.
  • Perilipin was detected in chorion laeve trophoblasts, likely as a small molecular weight isoform.

Conclusions:

  • LDs within fetal membranes exhibit cellular heterogeneity based on associated PAT proteins.
  • The specific PAT protein composition suggests specialized functional roles for LDs in different fetal membrane cell types.

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