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Lysosomal enzyme activities of human fetal organs during development
Insights
This study tracked four lysosomal enzymes in human fetal tissues. Kidney showed the largest enzyme activity increase, crucial for understanding fetal development.
Area of Science:
- Biochemistry
- Developmental Biology
- Human Physiology
Background:
- Lysosomal enzymes are vital for cellular function.
- Understanding their developmental trajectory is key to fetal health.
- Specific enzyme patterns during gestation are not fully elucidated.
Purpose of the Study:
- To investigate the developmental patterns of four key lysosomal enzymes.
- To quantify enzyme activity changes across various human fetal tissues.
- To compare fetal enzyme activity with adult levels.
Main Methods:
- Assay of acid alpha-glucosidase, alpha-galactosidase, beta-galactosidase, and acid phosphatase.
- Analysis of tissue samples from human fetuses across different gestational ages.
- Enzyme activity measurements in liver, kidney, lung, heart, spleen, muscle, and brain.
Main Results:
- Kidney exhibited the most significant increase (6- to 12-fold) in all four lysosomal enzymes between the second and third trimesters.
- Liver and spleen showed considerable enzyme activity increases during the same period.
- Muscle, lung, brain, and heart displayed varied enzyme activity changes, with some enzymes showing minimal alteration.
Conclusions:
- Kidney demonstrates a pronounced developmental surge in lysosomal enzyme activity during late gestation.
- Lysosomal enzyme development is tissue-specific, with significant variations observed.
- These findings provide insights into neonatal and postnatal lysosomal enzyme maturation.
Abstract:
The developmental patterns of four lysosomal enzymes have been investigated in liver, kidney, lung, heart, spleen, muscle and brain tissues of human fetuses at varius gestational ages. The largest increment in the activity of all four enzymes, namely acid alpha-glucosidase, alpha-galactosidase, beta-galactosidase and acid phosphatase had been observed in kidney with a 6- to 12-fold increase between the second and third trimester of gestation. The activity of all liver and spleen enzymes also increased considerably during these periods. In muscle, however, only alpha-glucosidase and acid phosphatase showed an increase in the activity, and in lung, acid phosphatase and beta-galactosidase. Most of brain and heart enzymes, except acid phosphatase, did not change significantly during the observation period. The activities of these lysosomal enzymes were also measured in tissues of a normal adult individual, and aspects of the neonatal and postnatal development of these enzymes were discussed.