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Related Experiment Videos

Strain-specific steroidal control of pituitary function.

Sang-Nam Lee1, Bonnie Peng, Roxane Desjardins

  • 1Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, New Orleans, 1901 Perdido Street, New Orleans, Louisiana 70112, USA.

The Journal of Endocrinology
|March 3, 2007
PubMed
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Genetic background significantly impacts how mice respond to steroid treatments. This study reveals distinct physiological changes in 129 and B6 mouse strains when exposed to dexamethasone, highlighting the importance of genetic background in research.

Area of Science:

  • Endocrinology
  • Neuroendocrinology
  • Genetics

Background:

  • 7B2 null mice exhibit differential mortality and hypercorticosteronemia based on genetic background (129/SvEvTac vs. C57BL/6NTac).
  • Genetic background profoundly influences the phenotype of 7B2 null mutations.

Purpose of the Study:

  • To investigate strain-dependent differences in response to chronic high circulating steroid levels.
  • To compare the effects of synthetic steroid dexamethasone (Dex) on wild-type 129 and B6 mouse strains.

Main Methods:

  • Chronic administration of dexamethasone (Dex) to wild-type 129 and B6 mice.
  • Analysis of neurointermediate lobe (NIL) dopamine content, D(2)R mRNA, POMC-derived peptides (alpha-MSH, ACTH, beta-endorphin), and circulating hormone levels.
  • Assessment of metabolic parameters including blood glucose and insulin levels.

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Main Results:

  • Dex treatment reduced NIL dopamine and increased NIL size in 129 mice, but not B6 mice.
  • 129 mice showed decreased circulating alpha-MSH and POMC peptides, while B6 mice had increased circulating alpha-MSH due to enhanced ACTH cleavage.
  • 129 mice developed hyperinsulinemia and hypoglycemia, whereas B6 mice showed hyperglycemia and hyperinsulinemia.

Conclusions:

  • Significant strain-dependent differences exist in the endocrinological response to chronic dexamethasone treatment between 129 and B6 mice.
  • These findings underscore the critical role of genetic background in steroid sensitivity and necessitate careful consideration when interpreting results from transgenic or knockout mouse studies.