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Related Experiment Videos

Streptozotocin-induced diabetes produces a decrease in pituitary substance P content and preprotachykinin mRNA

P A Rittenhouse1, R A Markle, J E Marchand

  • 1Department of Pharmacology, Boston University Medical Center, MA 02118-2394, USA.

Neuroscience Letters
|June 21, 1996
PubMed
Summary
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Diabetes mellitus impairs pituitary hormone regulation. This study found that streptozotocin-induced diabetes in rats significantly reduced substance P (SP) content and preprotachykinin (PPT) mRNA levels in the pituitary gland.

Area of Science:

  • Endocrinology
  • Neuroscience
  • Molecular Biology

Background:

  • Diabetes mellitus is linked to hormonal dysfunctions, including altered regulation of gonadotroph and corticotroph secretion.
  • Preprotachykinin (PPT) mRNA, encoding substance P (SP), is present in the anterior pituitary.

Purpose of the Study:

  • To investigate the impact of streptozotocin (STZ)-induced diabetes on SP content and PPT mRNA levels in the male rat pituitary.

Main Methods:

  • STZ was administered to induce diabetes in 6-week-old rats, confirmed by hyperglycemia (> 400 mg/dl).
  • SP-like immunoreactivity was measured using pituitary tissue.
  • In situ hybridization with a PPT-specific oligonucleotide quantified PPT mRNA levels in pituitary lobes using image analysis.

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Main Results:

  • A 54% decrease in SP-like immunoreactivity was observed in the pituitaries of diabetic rats compared to controls.
  • Diabetic rats showed a 23% reduction in PPT mRNA hybridization signal in the pituitary compared to controls (P < 0.05).
  • PPT mRNA exhibited a distinct regional distribution in the anterior pituitary, with no signal in posterior or intermediate lobes.

Conclusions:

  • STZ-induced diabetes significantly alters SP content and PPT gene expression in the rat pituitary.
  • These changes in PPT and SP may contribute to the hormonal complications associated with diabetes mellitus.