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The relationship between placental protein synthesis and transfer of amino acids
Insights
Placental protein synthesis significantly impacts amino acid transfer to the fetus. Inhibiting protein synthesis reduces amino acid availability for transfer, suggesting a link between these processes.
Area of Science:
- Biochemistry
- Physiology
- Developmental Biology
Background:
- The placenta facilitates nutrient transfer from mother to fetus.
- Amino acid transport and protein synthesis are crucial for fetal growth.
Purpose of the Study:
- To investigate the relationship between placental protein synthesis and amino acid transfer to the fetus in guinea pigs.
Main Methods:
- Utilized radiolabeled amino acids ([U-14C]-lysine, -leucine, -glycine, -aspartate, -alpha-aminoisobutyrate) in guinea pig models.
- Administered cycloheximide to inhibit protein synthesis and assessed its effects on amino acid incorporation and transfer.
- Measured specific radioactivity of L-[U-14C]lysine to confirm findings.
Main Results:
- 12-16% of transferred amino acid label was incorporated into placental protein.
- Cycloheximide inhibited protein synthesis by 81-96% and amino acid transfer by 62-75%.
- Transfer of non-protein amino acid alpha-aminoisobutyrate was unaffected by cycloheximide.
Conclusions:
- Placental protein synthesis is directly linked to the generation of an amino acid transfer pool.
- Inhibition of protein synthesis reduces the availability of amino acids for fetal transfer.
Abstract:
The relationship between placental protein synthesis and transfer of amino acids from mother to foetus was studied in the guinea pig, by using [U-14C]-lysine, -leucine, -glycine, -aspartate and -alpha-aminoisobutyrate. The uptake of label by protein was 12-16% of total label transferred. Cycloheximide inhibited incorporation of all naturally occurring amino acids into protein by 81-96% and transfer by 62-75%; the concentration of label in the free pool was increased for each. These findings were confirmed when specific-radioactivity measurements were made with L-[U-14C]lysine. The transfer of the non-protein amino acid alpha-aminoisobutyrate was not significantly decreased by cycloheximide. A model, linking protein synthesis to the generation of a transfer pool of amino acids, is proposed whereby inhibition of protein synthesis decreases the amount of amino acid available for transfer.