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Ontogeny of protein phosphatases 1 and 2A in developing rat lung
1Developmental Lung Biology Research Center, Childrens Hospital of Los Angeles, CA 90054.
Insights
Protein phosphatase 1 and 2A activities in rat lungs significantly increase during late gestation and early neonatal development. These enzyme activities show distinct patterns in soluble and particulate fractions, highlighting developmental changes in lung tissue.
Area of Science:
- Biochemistry
- Developmental Biology
- Pulmonology
Background:
- Protein phosphatases (PPs) are crucial enzymes regulating cellular processes.
- Understanding the developmental expression of PP1 and PP2A in lung tissue is important for respiratory health.
- Lung development involves complex enzymatic regulation, including dephosphorylation events.
Purpose of the Study:
- To quantify the activity of Protein Phosphatase 1 (PP1) and Protein Phosphatase 2A (PP2A) in rat lung homogenates during late gestation, neonatal, and adult stages.
- To investigate the differential distribution and activity of PP1 and PP2A in soluble and particulate fractions of lung tissue across different developmental periods.
Main Methods:
- Measurement of PP1 and PP2A activities in soluble and particulate fractions of rat lung homogenates.
- Analysis of enzyme activities in tissue samples from fetal rats (18-22 days gestation), neonates, and adults.
Main Results:
- PP1 activity in the particulate fraction showed a substantial 7-fold increase from 18 to 22 days gestation, with further increases in neonates.
- PP1 activity in the soluble fraction exhibited a marked increase throughout late gestation and neonatal development, reaching adult levels.
- PP2A activity increased in both soluble and particulate fractions during late gestation and continued to rise in the soluble fraction postnatally.
Conclusions:
- PP1 and PP2A activities undergo significant developmental regulation in rat lung tissue, particularly during late gestation and the neonatal period.
- The distinct developmental trajectories of PP1 and PP2A in soluble and particulate fractions suggest specific roles in lung maturation and function.
- These findings provide insights into the enzymatic machinery governing lung development and potential targets for respiratory interventions.
Abstract:
Protein phosphatase (PP) 1 and 2A activities were measured in soluble and particulate fractions of rat lung homogenates, obtained from 18- to 22-day gestation fetal rats, from neonates, and from adults. PP 1 activity in the particulate fraction increased 7-fold from 15 +/- 2 to 102 +/- 12 (mean +/- SD) U/g lung between 18 and 22 days gestation, increased a further 1.5-fold to 152 +/- 18 U/g in newborns, with no further increase in adults. PP 2A activity in the particulate fraction increased 3-fold from 10 +/- 2 to 32 +/- 5 U/g between 21 and 22 days gestation and did not change postnatally. PP 1 activity in the soluble fraction increased 7.8-fold from 4 +/- 2 to 31 +/- 4 U/g lung between 18 and 22 days gestation, increased a further 1.8-fold in newborns to 54 +/- 8 U/g lung and increased 1.5-fold to 81 +/- 6 U/g lung in adults. PP 2A activity in the soluble fraction increased 2.2-fold from 12 +/- 4 to 28 +/- 8 U/g lung between 18 and 22 days gestation, increased a further 1.7-fold in newborns to 47 +/- 9 U/g lung, and increased 1.6-fold to 75 +/- 10 U/g lung in adults. PP 1 activity was 1.6- to 3-fold higher in the particulate than the soluble fraction. PP 2A activity was 2-fold higher in the soluble than the particulate fraction after 21 days gestation, in neonates and adults.(ABSTRACT TRUNCATED AT 250 WORDS)