Protection of γ-Amino Butyric Acid on Radiation Induced Intestinal Injury in Mice

Area of Science:

• Gastroenterology
• Radiation Biology
• Mitochondrial Medicine

Background:

• Gamma-aminobutyric acid (GABA) shows promise in stress models, but its antioxidant role in radiation-induced intestinal injury (RIII) is not fully understood.
• Oxidative stress significantly contributes to RIII, impacting small intestine morphology and function.
• Understanding GABA's mechanisms can offer novel therapeutic strategies for radiation-induced damage.

Purpose of the Study:

• To elucidate the protective effects of Gamma-aminobutyric acid (GABA) against oxidative stress in the small intestine of radiation-induced intestinal injury (RIII) mice.
• To investigate the underlying mechanisms by which GABA influences mitochondrial function and apoptosis in RIII.

Main Methods:

• Mice were administered varying doses of GABA, and their survival rates and physiological responses were monitored.
• The study evaluated the impact of GABA and theanine on jejunum pathology, small intestine oxidative stress, and mitochondrial function in RIII mice.
• Apoptosis-related protein expression, including Bcl-2 and Caspase-3, was analyzed to understand cell death pathways.

Main Results:

• GABA administration reduced weight loss and significantly prolonged the median survival time in RIII mice.
• GABA and theanine protected the jejunum villus crypt, reduced liver hyperemia, and enhanced antioxidant capacity in the duodenum and its mitochondria.
• GABA increased B-cell lymphoma-2 (Bcl-2) expression and inhibited Caspase-3 activation, thereby reducing mitochondria-induced apoptosis.

Conclusions:

• Gamma-aminobutyric acid (GABA) effectively reduces oxidative stress in the small intestine of RIII mice, preserving mitochondrial integrity and normal function.
• The protective mechanism involves high Bcl-2 expression, which inhibits mitochondrial pathway autophagy, ultimately reducing intestinal barrier damage.
• GABA demonstrates significant therapeutic potential for mitigating radiation-induced intestinal injury.