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Intracellular Ca++/Mg++ homeostasis during postnatal growth of experimental rats. Multiple time-point study
M Bahar1, S Berman, Y Grinshpon
1Department of Anesthesiology, Assaf Harofeh Medical Center, Zerifin 70300, Israel. anesthesia@asaf.health.gov.il
Insights
Postnatal development reveals significant changes in calcium (Ca++) and magnesium (Mg++) levels in rat tissues. These ion fluctuations are linked to developing ion transport systems, impacting cellular functions during growth.
Area of Science:
- Biochemistry
- Developmental Biology
- Physiology
Background:
- Cell membrane ion transporting systems are crucial for maintaining cellular homeostasis.
- These systems are often underdeveloped or less active during prenatal and early postnatal stages.
- Ion transport system development is intrinsically linked to organismal growth and maturity.
Purpose of the Study:
- To investigate the developmental changes in calcium (Ca++) and magnesium (Mg++) homeostasis across various rat tissues.
- To understand the timeline of these homeostatic shifts during postnatal development.
Main Methods:
- A multiple time-point study design was employed.
- Intracellular Ca++ and Mg++ levels were measured in liver, brain, and spinal cord tissues at different postnatal developmental stages.
- Comparative analysis was performed between young and mature animal groups.
Main Results:
- One-week-old rat liver, brain, and spinal cord tissues exhibited significantly elevated intracellular Ca++ compared to mature animals.
- Intracellular Ca++ levels continued to rise through the first three weeks post-birth before declining in adult groups.
- Changes in intracellular Mg++ levels paralleled those of Ca++, though less pronounced.
Conclusions:
- A critical developmental switch in intracellular Ca++ and Mg++ homeostasis occurs between one and three weeks after birth.
- This switch is likely due to the incomplete maturation of transmembrane ion transporting systems.
- Altered intracellular ion content may regulate cell activities according to the physiological needs of growing animals.
Abstract:
In most tissues, various cell membrane ion transporting systems are not fully developed and/or maximally active at the prenatal and early postnatal stage. Their progressive development and expression are a function of growth and maturity. We performed a multiple time-point study, in order to investigate the ability of a variety of tissues to maintain appropriate Ca++ and Mg++ homeostasis at different stages of postnatal development. Total intracellular Ca++ in one-week-old rat liver, brain and spinal cord tissues was significantly elevated, compared to mature animals. It increased further through the first three weeks of gestation. Intracellular Ca++ gradually and significantly declined in adult and mature animal groups. Alterations in total intracellular Mg++ of the same tissue samples, although not so profound, paralleled changes in total intracellular Ca++. We conclude that a developmental switch in intracellular Ca++ and Mg++ homeostasis occurs one to three weeks following birth. It might be related to the incomplete development of Ca++ and Mg++ transmembrane transporting systems, previously reported as being only partially expressed at the early postnatal stage. These developmental alterations in total intracellular Ca++ and Mg++ content might serve as a regulatory mechanism, adjusting cell activities to the physiological requirements of the growing and maturing animal.