Diet, cellular, and systemic homeostasis control the cycling of potassium stable isotopes in endothermic vertebrates.

Autor:	Tacail T; Institute of Geosciences, Johannes Gutenberg University, J.-J.-Becher-Weg 21, D-55128, Mainz, Germany.; School of Earth Sciences, University of Bristol, Bristol, UK., Lewis J; School of Earth Sciences, University of Bristol, Bristol, UK., Clauss M; Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Switzerland., Coath CD; School of Earth Sciences, University of Bristol, Bristol, UK., Evershed R; Organic Geochemistry Unit, School of Chemistry, University of Bristol, UK., Albalat E; ENS de LYON, Universite Claude Bernard Lyon1, LGL-TPE, CNRS UMR 5276, Lyon, France., Elliott TR; School of Earth Sciences, University of Bristol, Bristol, UK., Tütken T; Institute of Geosciences, Johannes Gutenberg University, J.-J.-Becher-Weg 21, D-55128, Mainz, Germany.
Jazyk:	angličtina
Zdroj:	Metallomics : integrated biometal science [Metallomics] 2023 Nov 02; Vol. 15 (11).
DOI:	10.1093/mtomcs/mfad065
Abstrakt:	The naturally occurring stable isotopes of potassium (41K/39K, expressed as δ41K) have the potential to make significant contributions to vertebrate and human biology. The utility of K stable isotopes is, however, conditioned by the understanding of the dietary and biological factors controlling natural variability of δ41K. This paper reports a systematic study of K isotopes in extant terrestrial endothermic vertebrates. δ41K has been measured in 158 samples of tissues, biofluids, and excreta from 40 individuals of four vertebrate species (rat, guinea pig, pig and quail) reared in two controlled feeding experiments. We show that biological processing of K by endothermic vertebrates produces remarkable intra-organism δ41K variations of ca. 1.6‰. Dietary δ41K is the primary control of interindividual variability and δ41K of bodily K is +0.5-0.6‰ higher than diet. Such a trophic isotope effect is expected to propagate throughout trophic chains, opening promising use for reconstructing dietary behaviors in vertebrate ecosystems. In individuals, cellular δ41K is related to the intensity of K cycling and effectors of K homeostasis, including plasma membrane permeability and electrical potential. Renal and intestinal transepithelial transports also control fractionation of K isotopes. Using a box-modeling approach, we establish a first model of K isotope homeostasis. We predict a strong sensitivity of δ41K to variations of intracellular and renal K cycling in normal and pathological contexts. Thus, K isotopes constitute a promising tool for the study of K dyshomeostasis. (© The Author(s) 2023. Published by Oxford University Press.)
Databáze:	MEDLINE
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