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Glutamine transport in human and rat placenta
1Department of Pediatrics, University of Florida College of Medicine, Gainesville, USA.
Placenta
|July 1, 1997
Summary
This study investigated how nutrients like glutamine cross the placenta. We found multiple pathways for glutamine transport in both rat and human placentas, varying by species and developmental stage.
Area of Science:
- Biochemistry
- Physiology
- Developmental Biology
Background:
- Glutamine is vital for fetal nutrition and development.
- Placental nutrient transport is crucial for pregnancy outcomes.
- Understanding glutamine transport mechanisms is key to fetal health.
Purpose of the Study:
- To explore the mechanisms of [3H]glutamine transport across rat and human placental membranes.
- To identify the specific amino acid transport systems involved in placental glutamine uptake.
- To compare glutamine transport characteristics between rat and human placentas and across gestation.
Main Methods:
- Isolation of apical and basal predominant membrane vesicles from rat and human placenta.
- Measurement of Na+-dependent [3H]glutamine uptake into these vesicles.
- Identification of involved amino acid transport systems (e.g., A, ASC-like, B(o,+), y+L).
Main Results:
- Na+-dependent glutamine transport was observed in both rat and human placental vesicles.
- Multiple amino acid transport systems mediate glutamine uptake, with system N absent.
- Rat placental transport was higher in basal membranes, while human placental transport was higher in apical (microvillus) membranes.
- Transport activity varied with placental development (gestation) and species.
Conclusions:
- Na+-dependent glutamine transport in the placenta involves diverse transport systems.
- Placental glutamine transport mechanisms exhibit species-specific and developmental differences.
- These findings enhance our understanding of nutrient transfer essential for fetal growth.