Related Experiment Video
Updated: May 31, 2026
09:10
Intestinal Epithelial Regeneration in Response to Ionizing Irradiation
Published on: July 27, 2022
Radiation decreases murine small intestinal HCO3- secretion
Kunzhong Zhang1, Liangjie Yin, Mei Zhang
1Vascular Medicine Research, Brigham and Women's Hospital, Harvard Medical School, Cambridge, Massachusetts, USA. K. Zhang
International Journal of Radiation Biology
|June 22, 2011
Summary
Irradiation alters jejunal anion secretion in mice, reducing bicarbonate and increasing chloride loss. This understanding aids in managing electrolyte imbalances and gastrointestinal issues post-irradiation.
Area of Science:
- Gastroenterology
- Radiation Oncology
- Physiology
Background:
- Secretagogue-induced diarrhea is characterized by high chloride and bicarbonate anion content.
- The anionic composition of diarrhea following irradiation remains largely uncharacterized.
Purpose of the Study:
- To investigate and delineate the differences in cyclic adenosine monophosphate (cAMP)-stimulated anion secretions between irradiated and non-irradiated mice.
- To characterize the specific anion composition of diarrhea post-irradiation.
Main Methods:
- Ussing-chamber experiments were conducted on jejunal tissues from γ-irradiated and non-irradiated BALB/c mice.
- Bicarbonate secretion was measured under basal, cAMP-stimulated, and irradiated conditions.
- Immunohistochemistry and Western blot analysis were used to assess transporter expression.
Main Results:
- Irradiated mice showed inhibited bicarbonate secretion in jejunal tissues.
- A shift towards chloride-dominant anion secretion was observed in irradiated mice.
- Reduced expression and protein levels of the sodium-bicarbonate cotransporter were noted in irradiated mice.
Conclusions:
- Anion secretion in irradiated mice differs significantly from secretagogue-induced diarrhea, with minimal bicarbonate and primary chloride loss.
- Understanding these anion losses is crucial for correcting electrolyte imbalances.
- Reduced upper gastrointestinal bicarbonate secretion may contribute to irradiation-induced nausea and vomiting.
