RGD Reference Report - Mineralocorticoid Excess or Glucocorticoid Insufficiency: Renal and Metabolic Phenotypes in a Rat Hsd11b2 Knockout Model. - Rat Genome Database

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Mineralocorticoid Excess or Glucocorticoid Insufficiency: Renal and Metabolic Phenotypes in a Rat Hsd11b2 Knockout Model.

Authors: Mullins, Linda J  Kenyon, Christopher J  Bailey, Matthew A  Conway, Bryan R  Diaz, Mary E  Mullins, John J 
Citation: Mullins LJ, etal., Hypertension. 2015 Sep;66(3):667-73. doi: 10.1161/HYPERTENSIONAHA.115.05262. Epub 2015 Jun 15.
RGD ID: 13800514
Pubmed: PMID:26077568   (View Abstract at PubMed)
PMCID: PMC4847935   (View Article at PubMed Central)
DOI: DOI:10.1161/HYPERTENSIONAHA.115.05262   (Journal Full-text)

Obesity and hypertension are 2 major health issues of the 21st century. The syndrome of apparent mineralocorticoid excess is caused by deficiency of 11ß-hydroxysteroid dehydrogenase type 2 (Hsd11b2), which normally inactivates glucocorticoids, rendering the mineralocorticoid receptor aldosterone-specific. The metabolic consequences of Hsd11b2 knockout in the rat are investigated in parallel with electrolyte homeostasis. Hsd11b2 was knocked out, by pronuclear microinjection of targeted zinc-finger nuclease mRNAs, and 1 line was characterized for its response to renal and metabolic challenges. Plasma 11-dehydrocorticosterone was below detection thresholds, and Hsd11b2 protein was undetected by Western blot, indicating complete ablation. Homozygotes were 13% smaller than wild-type littermates, and were polydipsic and polyuric. Their kidneys, adrenals, and hearts were significantly enlarged, but mesenteric fat pads and liver were significantly smaller. On a 0.3% Na diet, mean arterial blood pressure was ˜65 mm Hg higher than controls but only 25 mm Hg higher on a 0.03% Na(+) diet. Urinary Na/K ratio of homozygotes was similar to controls on 0.3% Na(+) diet but urinary albumin and calcium were elevated. Corticosterone and aldosterone levels showed normal circadian variation on both a 0.3% and 0.03% Na(+) diet, but plasma renin was suppressed in homozygotes on both diets. Plasma glucose responses to an oral glucose challenge were reduced despite low circulating insulin, indicating much greater sensitivity to insulin in homozygotes. The rat model reveals mechanisms linking electrolyte homeostasis and metabolic control through the restriction of Hsd11b1 substrate availability.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
hypertension  IMP 13800514; 13800514; 13800514 RGD 
hypertension  ISOHsd11b2 (Rattus norvegicus)13800514; 13800514 RGD 

Phenotype Annotations    Click to see Annotation Detail View

Objects Annotated

Genes (Rattus norvegicus)
Hsd11b2  (hydroxysteroid 11-beta dehydrogenase 2)
Hsd11b2em1Jmul  (hydroxysteroid 11-beta dehydrogenase 2; ZFN induced mutant1, Jmul)

Genes (Mus musculus)
Hsd11b2  (hydroxysteroid 11-beta dehydrogenase 2)

Genes (Homo sapiens)
HSD11B2  (hydroxysteroid 11-beta dehydrogenase 2)

Strains
F344-Hsd11b2em1Jmul-/-  (F344-Hsd11b2em1Jmul-/Hsd11b2em1Jmul-)


Additional Information