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Summary
Murine jejunum exhibits heat sensitivity and develops thermotolerance, crucial for understanding intestinal hyperthermia responses. Heat fractionation and antibiotics significantly improved survival rates, suggesting combined strategies enhance outcomes.
Area of Science:
- Gastroenterology
- Radiation Oncology
- Physiology
Background:
- The heat sensitivity of the murine jejunum is critical for understanding thermal injury.
- Developing thermotolerance is a key factor in the intestinal response to heat stress.
Purpose of the Study:
- To measure the heat sensitivity and thermotolerance of the murine jejunum.
- To investigate the impact of heat fractionation and antibiotic treatment on intestinal heat injury.
Main Methods:
- Exteriorized jejunal loops from C3H/HeJ mice were heated in water baths (43-46°C).
- Median lethal dose (LD50/7) was calculated as a function of temperature and time.
- Thermotolerance was assessed using heat fractionation intervals (1 and 3 days).
- The effect of gentamicin on survival and septicemia was evaluated.
Main Results:
- The LD50/7 was independent of loop length, serum presence, starvation, and fluid replacement.
- A single heat treatment (5 min at 45°C) increased LD50/7, indicating thermotolerance development.
- Heat fractionation and gentamicin significantly increased LD50/7, especially with 1-day intervals.
- Septicemia was a major cause of death, even with antibiotic treatment.
Conclusions:
- Thermotolerance plays a significant role in the intestinal response to hyperthermia.
- Heat damage to intestinal barriers contributes to septicemia, superimposed on cellular damage.
- Combined heat fractionation and antibiotic therapy show potential for improving survival in intestinal heat injury.