Related Experiment Video
Updated: Aug 12, 2025
08:37
Isolation, Fixation, and Immunofluorescence Imaging of Mouse Adrenal Glands
Published on: October 2, 2018
24.1K
Intestinal aldosterone synthase activity and aldosterone synthesis in mouse.
Z Pang1, R Korpela2,3, H Vapaatalo2
1Faculty of Medicine, Pharmacology, University of Helsinki, Helsinki, Finland. zan.pang@helsinki.fi.
Summary
Aldosterone production occurs in the murine intestine, with the aldosterone synthase enzyme (CYP11B2) showing higher activity in the large intestine. This activity and aldosterone concentration increase during nighttime, suggesting a diurnal rhythm in intestinal mineralocorticoid production.
Area of Science:
- Endocrinology
- Gastroenterology
- Molecular Biology
Background:
- Aldosterone is a key mineralocorticoid hormone regulating kidney function.
- Recent studies identified aldosterone production components in the murine large intestine.
- The role and regulation of intestinal aldosterone production remain incompletely understood.
Purpose of the Study:
- To correlate aldosterone synthase (CYP11B2) protein levels with its enzymatic activity and aldosterone concentration in different gastrointestinal tract sections.
- To investigate the diurnal variation of CYP11B2 activity and aldosterone levels in the murine intestine.
Main Methods:
- Enzyme preparations from homogenized intestinal sections were used for in vitro CYP11B2 activity assays.
- Aldosterone concentration was measured in different tissue sections.
- Measurements were taken at four time points across light and dark cycles in mice.
Main Results:
- CYP11B2 enzyme activity was significantly higher in the large intestine compared to the small intestine.
- Intestinal CYP11B2 activity and aldosterone concentration increased during the dark period (nighttime).
- Aldosterone synthase activity was detected throughout the intestine, with peak activity in the large intestine during darkness.
Conclusions:
- The murine intestine possesses functional aldosterone synthase (CYP11B2) activity.
- Intestinal aldosterone production exhibits diurnal variation, with increased activity and concentration during the dark phase.
- These findings suggest a potential role for local intestinal aldosterone production in physiological regulation.
