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Real-time Analyses of Retinol Transport by the Membrane Receptor of Plasma Retinol Binding Protein
Published on: January 28, 2013
Immunohistochemical localization of bovine placental retinol-binding protein
1Department of Animal Science, University of Tennessee, Knoxville 37901.
Insights
Bovine placental retinol-binding protein is present in extraembryonic membranes. Epithelial cells of the amnion, chorion, and allantois are the primary sources, suggesting retinol
Area of Science:
- Veterinary Science
- Reproductive Biology
- Cell Biology
Background:
- Retinol-binding protein (RBP) plays a crucial role in retinol transport.
- Understanding RBP distribution in bovine placenta is essential for reproductive health.
- Extraembryonic membranes are vital for fetal development and nutrient exchange.
Purpose of the Study:
- To investigate the localization of bovine placental retinol-binding protein (b плацентарный RBP) in extraembryonic membranes.
- To identify the specific cell types responsible for b плацентарный RBP production within these membranes.
- To explore the potential role of retinol in bovine placental development.
Main Methods:
- Immunogold staining combined with epipolarization microscopy was employed.
- Bovine extraembryonic membranes (amnion, chorion, allantois) were fixed and embedded.
- Immunostaining utilized rabbit antiserum against b плацентарный RBP and gold-labeled secondary antibodies.
Main Results:
- Bovine placental retinol-binding protein was detected in the epithelial cells of the amnion, chorion, and allantois.
- Immunoreactivity was specific to epithelial cells, excluding mesodermal cells, collagen, and blood cells.
- These findings align with previous observations of RBP synthesis and secretion by these membranes.
Conclusions:
- Epithelial cells lining the bovine amnion, chorion, and allantois are the main producers of placental retinol-binding protein.
- The presence of RBP in placental membranes and fluids suggests a significant role for retinol in placental differentiation and development.
- Further research is warranted to elucidate the precise functions of retinol in bovine reproductive processes.
Abstract:
An immunogold staining method was used in combination with epipolarization microscopic detection to demonstrate the presence of bovine placental retinol-binding protein in bovine extraembryonic membranes. Amnion, chorion and allantois were fixed in Bouin fixation fluid and embedded in polyethylene glycol 1500. Sections (5 mm) were cut and transferred onto Digene silanated slides and immunostained using rabbit antiserum raised against bovine placental retinol-binding protein followed by goat anti-rabbit IgG labeled with 1 nm gold. Gold particles after silver enhancement were viewed and photographed under epipolarization microscopy. Epithelial cells of all three membranes (i.e. amniotic ectoderm, chorionic trophectoderm, and allantoic endoderm) were immunoreactive, while mesodermal cells, collagen, and blood cells were not. These data, together with our previous observation that these three placental membranes synthesize and secrete retinol-binding protein, indicate that epithelial cells lining the amnion, chorion and allantois are the major sources of this protein. The presence of retinol-binding protein in placental membranes and their fluids may be indicative of an important role for retinol in placental differentiation and development.
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