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Effects of vitamin B6 deficiency and repletion on the uptake of steroid hormones into uterus slices and isolated liver cells of rats

Published online by Cambridge University Press:  09 March 2007

David A. Bender ,
Kweku Ghartey-Sam  and
Amerjit Singh
David A. Bender
Affiliation:
Department of Biochemistry, University College and Middlesex School of Medicine, University College London, Gower Street, London WCIE 6BT
Kweku Ghartey-Sam
Affiliation:
Department of Biochemistry, University College and Middlesex School of Medicine, University College London, Gower Street, London WCIE 6BT
Amerjit Singh
Affiliation:
Department of Biochemistry, University College and Middlesex School of Medicine, University College London, Gower Street, London WCIE 6BT
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Abstract

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1. In vitro, pyridoxal phosphate extracts steroid-hormone receptors from tight nuclear binding (Cidlowski & Thanassi, 1981); in vitamin B6-deficient rats there is increased and prolonged nuclear accumulation of oestradiol in the uterus and testosterone in the prostate, associated with enhanced biological responsiveness of these target tissues to steroid hormone action (Symes et al. 1984; Bowden et al. 1986).

2. Slices of uterus from vitamin B6-deficient rats accumulated more [3H]oestradiol than did tissue from repleted animals. Acute repletion with vitamin B6 (0.5–1 h before killing) further increased the uptake of the steroid.

3. Isolated hepatocytes from vitamin B6-deficient rats accumulated more [3H]dexamethasone than did cells from repleted animals. Pre-incubation of the hepatocytes with pyridoxal phosphate resulted in a further increase in the uptake of the steroid.

4. The results suggest that in addition to the putative role of pyridoxal phosphate in releasing steroid-hormone-receptor complexes from tight nuclear binding (Cidlowski & Thanassi, 1981), vitamin B6 deficiency may also increase the concentration of steroid-hormone receptors or enzymes and other steroid-binding proteins in target tissues.

Type
Hormones, Metabolism
Information
British Journal of Nutrition , Volume 61 , Issue 3 , May 1989 , pp. 619 - 628
Copyright
Copyright © The Nutrition Society 1989

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