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Corticoadrenal activity regulates in rat betaine-homocysteine S-methyltransferase expression with opposites effects in liver and kidney

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Abstract

Betaine-homocysteine S-methyltransferase (BHMT) is an enzyme that converts homocysteine (Hcy) to methionine using betaine as a methyl donor. Betaine also acts as osmolyte in kidney medulla, protecting cells from high extracellular osmolarity. Hepatic BHMT expression is regulated by salt intake. Hormones, particularly corticosteroids, also regulate BHMT expression in rat liver. We investigated to know whether the corticoadrenal activity plays a role in kidney BHMT expression. BHMT activity in rat kidneys is several orders of magnitude lower than in rat livers and only restricted to the renal cortex. This study confirms that corticosteroids stimulate BHMT activity in the liver and, for the first time in an animal model, also up-regulate the BHMT gene expression. Besides, unlike the liver, corticosteroids in rat kidney down-regulate BHMT expression and activity. Given that the classical effect of adrenocortical activity on the kidney is associated with sodium and water re-absorption by the distal tubule leading to volume expansion, by promoting lesser use of betaine as a methyl donor, corticosteroids would preserve betaine for its other role as osmoprotectant against changes in the extracellular osmotic conditions. We conclude that corticosteroids are, at least in part, responsible for the inhibition of BHMT expression and activity in rat kidneys.

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Acknowledgements

The authors wish to thank Dr José Burdman, for critically reviewing the manuscript, Dra. María A Pajares for the gift of the Anti-BHMT polyclonal antibodies (rabbit) and Bioq. José L D’Eramo for their technical assistance. This study was supported by a grant from the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina (PIP 5716), and by a grant from the Universidad Abierta Interamericana UAI. AVM, LEB, PCT-N and EAP have no conflicts of interest to declare.

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Correspondence to Osvaldo Fridman.

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[Fridman O, Morales AV, Bortoni LE, Turk-Noceto PC and Prieto EA 2012 Corticoadrenal activity regulates in rat betaine-homocysteine S-methyltransferase expression with opposites effects in liver and kidney. J. Biosci. 37 XXX–XXX] DOI

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Fridman, O., Morales, A.V., Bortoni, L.E. et al. Corticoadrenal activity regulates in rat betaine-homocysteine S-methyltransferase expression with opposites effects in liver and kidney. J Biosci 37, 115–123 (2012). https://doi.org/10.1007/s12038-011-9171-5

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