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Updated: Aug 7, 2025

Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes
Published on: May 10, 2022
Fetal membranes exhibit similar nutrient transporter expression profiles to the placenta
Ryan C V Lintao1, Ananth Kumar Kammala2, Natasha Vora3
1Division of Basic Science and Translational Research, Department of Obstetrics & Gynecology, The University of Texas Medical Branch at Galveston, 301 University Blvd., Galveston, TX, 77555-1062, USA; College of Medicine, University of the Philippines Manila, 547 Pedro Gil St., Manila, 1000, Philippines.
Insights
Human fetal membranes express nutrient transporters, similar to placental cells. This finding is crucial for understanding nutrient uptake during pregnancy and requires further functional studies.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Human Physiology
Background:
- Fetal growth relies on nutrient exchange via the utero-placental unit.
- Nutrient transfer is mediated by solute carrier (SLC) and adenosine triphosphate-binding cassette (ABC) proteins.
- The role of human fetal membranes (FM) in nutrient uptake is largely unknown, despite their known role in drug transport.
Purpose of the Study:
- To determine nutrient transporter gene and protein expression in human FM.
- To compare nutrient transporter expression in FM with placental tissues and BeWo cells.
Main Methods:
- RNA sequencing (RNA-Seq) of placental and FM tissues and cells.
- Identification of solute carrier (SLC) and adenosine triphosphate-binding cassette (ABC) transporter genes.
- Proteomic analysis using nano-liquid chromatography-tandem mass spectrometry (nanoLC-MS/MS) to confirm protein expression.
Main Results:
- Human FM tissues and cells express nutrient transporter genes, with expression patterns similar to placental tissues and BeWo cells.
- Transporters for macronutrients and micronutrients, including carbohydrate, vitamin, amino acid, fatty acid, cholesterol, and nucleoside transporters, were identified in both FM and BeWo cells.
- Proteomic analysis confirmed the expression of these nutrient transporters at the protein level.
Conclusions:
- Human fetal membranes express a range of nutrient transporters.
- This study provides foundational knowledge for understanding nutrient uptake in the FM during pregnancy.
- Further functional studies are necessary to elucidate the specific properties and roles of these transporters in FM.
Introduction:
During pregnancy, the growth of the fetus is supported by the exchange of nutrients, waste, and other molecules between maternal and fetal circulations in the utero-placental unit. Nutrient transfer, in particular, is mediated by solute transporters such as solute carrier (SLC) and adenosine triphosphate-binding cassette (ABC) proteins. While nutrient transport has been extensively studied in the placenta, the role of human fetal membranes (FM), which was recently reported to have a role in drug transport, in nutrient uptake remains unknown.
Objectives:
This study determined nutrient transport expression in human FM and FM cells and compared expression with placental tissues and BeWo cells.
Methods:
RNA sequencing (RNA-Seq) of placental and FM tissues and cells was done. Genes of major solute transporter groups, such as SLC and ABC, were identified. Proteomic analysis of cell lysates was performed via nano-liquid chromatography-tandem mass spectrometry (nanoLC-MS/MS) to confirm expression at a protein level.
Results:
We determined that FM tissues and cells derived from the fetal membrane tissues express nutrient transporter genes, and their expression is similar to that seen in the placenta or BeWo cells. In particular, transporters involved in macronutrient and micronutrient transfer were identified in both placental and FM cells. Consistent with RNA-Seq findings, carbohydrate transporters (3), vitamin transport-related proteins (8), amino acid transporters (21), fatty acid transport-related proteins (9), cholesterol transport-related proteins (6) and nucleoside transporters (3) were identified in BeWo and FM cells, with both groups sharing similar nutrient transporter expression.
Conclusion:
This study determined the expression of nutrient transporters in human FMs. This knowledge is the first step in improving our understanding of nutrient uptake kinetics during pregnancy. Functional studies are required to determine the properties of nutrient transporters in human FMs.
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