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Expression and activity of the Ca(2+)-atpase enzyme in human neonatal erythrocytes

I Kocsis1, B Vásárhelyi, E Héninger

  • 1First Department of Paediatrics, Semmmelweis Medical University, Budapest, Hungary. kopist@gyer1.sote.hu

Biology of the Neonate
|October 5, 2001
PubMed

Insights

Plasma membrane Ca(2+)-ATPase (PMCA) abundance and activity change during early development. Pre-term infants may have immature PMCA enzyme function, impacting calcium regulation.

Area of Science:

  • Biochemistry
  • Physiology
  • Developmental Biology

Background:

  • The plasma membrane Ca(2+)-ATPase (PMCA) is crucial for maintaining calcium ion (Ca2+) homeostasis.
  • Understanding PMCA's role in perinatal development is essential for assessing infant health.

Purpose of the Study:

  • To investigate changes in PMCA abundance and activity in human erythrocytes during the perinatal period.
  • To compare PMCA in pre-term neonates, full-term neonates, and young children (1-4 years).

Main Methods:

  • Analysis of PMCA molecule abundance and enzyme activity in erythrocyte samples.
  • Comparison across different age groups: pre-term neonates, full-term neonates, and children aged 1-4 years.

Main Results:

  • Lower abundance of the PMCA 4b isoform correlated with reduced enzyme activity in full-term neonates versus children.
  • Pre-term neonates had increased PMCA molecule numbers but similar total enzyme activity compared to full-term neonates.

Conclusions:

  • PMCA molecule abundance undergoes significant alterations during perinatal development.
  • The findings suggest potential functional immaturity of the PMCA enzyme in pre-term infants, despite higher molecule counts.

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