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. 1996 Apr 15;315(Pt 2):555–562. doi: 10.1042/bj3150555

Transcriptional regulation by glucocorticoids of mitochondrial oxidative enzyme genes in the developing rat kidney.

F Djouadi 1, J Bastin 1, D P Kelly 1, C Merlet-Benichou 1
PMCID: PMC1217232  PMID: 8615829

Abstract

Mitochondrial fatty acid beta-oxidation plays a major role in providing the ATP required for reabsorptive processes in the adult rat kidney. However, the molecular mechanisms and signals involved in induction of the enzymes of fatty acid oxidation during development in this and other organs are unknown. We therefore studied the changes in the steady-state levels of mRNA encoding medium-chain acyl-CoA dehydrogenase (MCAD), which catalyses the initial step in mitochondrial fatty acid beta-oxidation, in the rat kidney cortex and medulla between postnatal days 10 and 30. Furthermore, we investigated whether the expression of MCAD and of mitochondrial malate dehydrogenase (mMDH), a key enzyme in the tricarboxylic acid cycle, might be co-ordinately regulated by circulating glucocorticoids in the immature kidney during development. In the cortex, the levels of MCAD mRNA rose 4-fold between day 10 and day 21, and then decreased from day 21 to day 30. In the medulla a postnatal increase in the concentration of MCAD mRNA (8-fold) was observed during the same period. Adrenalectomy prevented the 16-21-day developmental increases in MCAD and mMDH mRNA levels in the cortex and medulla; these could be restored by dexamethasone treatment. A single injection of dexamethasone into 10-day-old rats led to a rise in MCAD and mMDH mRNA levels in the renal cortex due to stimulation of gene transcription, as shown by nuclear run-on assays. Therefore MCAD and mMDH gene expression is tightly regulated at the transcriptional level by developmental changes in circulating glucocorticoid levels. These hormones might thus represent a good candidate as a co-ordinating factor in the expression of nuclear genes encoding mitochondrial enzymes in the kidney during postnatal development.

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Selected References

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