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Intestinal ischemic preconditioning: less xanthine accumulation relates with less apoptosis
1Department of Experimental Pathology, Instituto de Investigaciones Biomédicas, IIBB-CSIC, IDIBAPS, Barcelona, Spain.
Summary
Ischemic preconditioning reduces intestinal apoptosis during reperfusion by lowering xanthine/hypoxanthine substrates for xanthine oxidase. This protective effect is linked to reduced nucleotide accumulation, preventing cell death.
Area of Science:
- Gastroenterology
- Cell Biology
- Physiology
Background:
- Ischemic preconditioning is known to protect the intestinal mucosa from ischemia/reperfusion injury.
- The precise mechanisms, particularly the role of substrate availability for xanthine oxidase, require further elucidation.
Purpose of the Study:
- To investigate whether the reduction in apoptotic events during intestinal ischemic preconditioning is associated with decreased xanthine/hypoxanthine levels.
- To explore the role of xanthine oxidase in mediating apoptosis during ischemia/reperfusion.
Main Methods:
- Animal models subjected to different experimental conditions: control, ischemia/reperfusion (I/R), ischemic preconditioning (P+I/R), P+I/R with hypoxanthine/xanthine (H/X), and P+I/R+H/X with allopurinol.
- Assessment of apoptotic markers including caspase-3 activity, DNA fragmentation, and TUNEL staining.
Main Results:
- Ischemia/reperfusion significantly increased apoptotic markers compared to controls.
- Ischemic preconditioning reversed these apoptotic markers to control levels.
- Supplementation with hypoxanthine/xanthine during preconditioning exacerbated apoptosis, while allopurinol administration mitigated this effect.
Conclusions:
- Intestinal ischemic preconditioning effectively reduces apoptosis during subsequent ischemia/reperfusion.
- This protective effect is attributed to a decrease in the accumulation of xanthine/hypoxanthine, thereby limiting substrate for xanthine oxidase activity.