Comprehensive multi-organ reference map of mitochondrial function in swine

Area of Science:

• Mitochondrial physiology
• Organ-specific cellular responses
• Traumatic brain injury (TBI) and polytrauma research

Background:

• Traumatic brain injury (TBI) frequently co-occurs with polytrauma, leading to compounded systemic effects.
• Understanding organ-specific cellular responses is critical for military TBI research.
• Swine models are valuable for TBI and polytrauma research due to their brain size and structure.

Purpose of the Study:

• To collect reference data on mitochondrial functional parameters in multiple organs and brain regions of healthy control swine.
• To establish baseline mitochondrial bioenergetics, calcium buffering, and cell death marker expression.
• To identify organ- and brain region-specific patterns in mitochondrial function.

Main Methods:

• Mitochondria were isolated from vital organs (brain, heart, lung, liver, kidney, spleen, muscle, intestine) and brain regions (cortex, striatum, cerebellum, hippocampus) of Yorkshire male swine.
• Real-time analyses of mitochondrial bioenergetics and calcium (Ca2+) buffering were performed.
• Mitochondrial membrane integrity, cell death markers (Complex IV, Cyt C, VDAC, Bcl-2), and antioxidant proteins (SOD, CAT, TRX, PRX) were assessed.

Main Results:

• Organ- and brain region-specific patterns of mitochondrial function were observed in healthy swine.
• Brain and heart mitochondria demonstrated higher bioenergetics and Ca2+ buffering capacity compared to other organs.
• Unique organ-specific differences were found in mitochondrial membrane integrity, cell death markers, and antioxidant protein expression.

Conclusions:

• This study provides essential baseline reference data on mitochondrial function across various swine organs and brain regions.
• The findings highlight significant organ-specific variations in mitochondrial bioenergetics and cellular response markers.
• This data serves as a foundation for future research investigating mitochondrial responses in TBI and polytrauma injury models.