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Computer simulation for effect of Pr(III) on Ca(II) speciation in human interstitial fluid
Haiyuan Zhang1, Xing Lu, Jinping Wang
1Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.
Biological Trace Element Research
|September 6, 2003
Summary
This study models metal ion speciation in human interstitial fluid, revealing how Praseodymium(III) affects Calcium(II) distribution. Increased Pr(III) alters Calcium(II) binding with ligands, impacting its bioavailability.
Area of Science:
- Biogeochemistry
- Environmental Chemistry
- Computational Chemistry
Background:
- Metal ion speciation in human interstitial fluid is crucial for understanding biological processes and toxicological effects.
- Calcium(II) is a vital ion in biological systems, and its speciation can be influenced by other metal ions.
- Understanding the interactions between different metal ions and ligands in biological fluids is essential for health and environmental science.
Purpose of the Study:
- To construct a multiphase model for metal ion speciation in human interstitial fluid.
- To investigate the specific effects of Praseodymium(III) (Pr(III)) on Calcium(II) (Ca(II)) speciation.
- To quantify the changes in Ca(II) distribution in the presence of varying concentrations of Pr(III).
Main Methods:
- Development of a multiphase equilibrium model.
- Simulation of metal ion speciation under varying Pr(III) concentrations.
- Analysis of ligand competition between Pr(III) and Ca(II) in a simulated interstitial fluid environment.
Main Results:
- Ca(II) primarily distributes as free Ca2+, [Ca(HCO3)], and [Ca(Lac)] in human interstitial fluid.
- Increasing Pr(III) concentration leads to a rise in free Ca2+, [Ca(Lac)], and [Ca(His)(Thr)H3].
- The speciation of Ca(II) shifts, with decreases in CaHPO4(aq) and [Ca(Cit)(His)H2], and an initial increase followed by a decrease in [Ca(HCO3)] and CaCO3(aq) above a specific Pr(III) threshold.
Conclusions:
- Pr(III) significantly influences Ca(II) speciation in human interstitial fluid through ligand competition.
- The observed shifts in Ca(II) distribution have implications for understanding metal ion homeostasis and potential toxicological interactions.
- The developed model provides a valuable tool for predicting metal ion behavior in complex biological matrices.