Tissue-specific ischemia responses in rabbits merit basic research follow-up; leaves open human cardiac translation and clinical relevance.
Key Points
To determine and compare the effects of ischemia on adenine nucleotides and their degradation products in cardiac and skeletal muscle.
Examined baseline and post-ischemic metabolite concentrations in rabbit cardiac and skeletal muscle tissue.
Quantified and tracked changes in ATP, creatine phosphate, ADP, AMP, IMP, adenosine, inosine, and hypoxanthine.
Baseline skeletal muscle contained 56% more ATP and 225% more creatine phosphate than cardiac muscle, exhibiting a smaller percentage reduction of both substrates during ischemia.
Ischemia decreased ADP and AMP in skeletal muscle while increasing them in cardiac muscle, with IMP increasing in skeletal muscle and newly appearing in ischemic cardiac tissue.
Adenosine emerged exclusively in ischemic cardiac muscle, whereas inosine and hypoxanthine accumulated in both ischemic muscle types.