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Selenium Distribution and Speciation in Tissues from Rats Administered with Non-Native Selenotrisulfides.

Ani T Baker¹, Clinton J Kidman^1,2, Linda I Vogt²

¹Discipline of Chemistry, The University of Adelaide, North Terrace, Adelaide, SA 5005, Australia.

Inorganic Chemistry

|May 13, 2025

Summary

This summary is machine-generated.

Selenotrisulfides (STS) are key metabolic intermediates that facilitate selenium transport and utilization in rats. These compounds, identified in various tissues, play vital roles in selenium

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Area of Science:

Biochemistry
Toxicology
Analytical Chemistry

Background:

Selenotrisulfides (STS) are crucial intermediates in selenium bioconversion.
STS reactivity with thiols aids selenium transport and utilization.
Understanding in vivo selenium speciation is vital for human health.

Purpose of the Study:

Investigate selenium distribution and speciation in vivo.
Determine the role of STS in selenium metabolism and transport.
Examine selenium and copper colocalization in the kidney.

Main Methods:

X-ray fluorescence microscopy (XFM) for elemental mapping.
High energy resolution fluorescence detected X-ray absorption spectroscopy (HERFD-XAS) for speciation.
Administration of different selenium compounds to male rats.

Main Results:

Elevated selenium concentrations in kidney, liver, and blood, but not testes.
Strong colocalization of selenium and copper in the renal cortex.
Distinct selenium speciation in different tissues and blood components.
STS identified in most tissues, excluding testes.

Conclusions:

STS are vital for intracellular selenium reduction and transport.
Selenium speciation varies significantly across tissues and blood.
Further research into selenium-copper interactions is warranted.