Paper
Cloning, sequencing and tissue-distribution of mouse 11β-hydroxysteroid dehydrogenase-1 cDNA

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Abstract

11β-Hydroxysteroid dehydrogenase (11β-HSD) reversibly converts physiological glucocorticoids (cortisol, corticosterone) to inactive 11-dehydro forms, and thus controls glucocorticoid access to receptors in a variety of tissues. We have cloned a cDNA encoding ‘liver-type’ 11β-HSD (11β-HSD1) from the mouse using PCR, and have determined its nucleotide sequence. Mouse 11β-HSD1 cDNA showed 91% identity to rat 11β-HSD1 cDNA. There was 87% amino acid identity with rat 11β-HSD1 with conservation of the putative cofactor and substrate binding domains. Northern blot analysis of mouse tissues demonstrated abundant 11β-HSD1 message in the liver, kidney and lung, with lower expression in brain subregions and gonads. 11β-HSD1 mRNA was below the level of detection in the murine colon. 11β-HSD1 mRNA levels in kidney was higher in males than in females, but in contrast to the rat, there was no sexual dimorphism in the mouse liver. Although males and females showed different mRNA levels in the kidney, there was no sex difference in 11β-HSD enzyme activity. Thus, despite the high inter-species conservation of 11β-HSD1, there are clear species and tissue-specific differences in its expression.

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      This was distinct from the enzyme described by Monder, being a high affinity (low nM Km) exclusive 11β-dehydrogenase which used NAD rather than NADP(H) as co-substrate. In 1994, Krozowski’s group [6] isolated a cDNA encoding this ‘renal’ 11β-HSD from human kidney, White and colleagues found the same enzyme in sheep kidney [2], the rodent homologues were soon cloned [214] and an identical enzyme purified and its encoding cDNA cloned in the human placenta [27]. The new enzyme was called 11β-HSD type 2 to distinguish it from Monder’s 11β-HSD type 1 (Fig. 1).

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