Noninvasive, nondestructive approaches to cell bioenergetics

Area of Science:

• Biophysics
• Biomedical Engineering
• Physiology

Background:

• Continuous, noninvasive monitoring of cell bioenergetics is crucial for understanding tissue health.
• Existing methods may be invasive or limited in scope.
• Phosphorus-31 Nuclear Magnetic Resonance (31P NMR) offers potential for in vivo metabolic assessment.

Purpose of the Study:

• To demonstrate the feasibility of using 31P NMR for continuous, noninvasive, and nondestructive evaluation of cell bioenergetics in human limbs and larger animals.
• To develop a simple and inexpensive 31P NMR apparatus for this purpose.

Main Methods:

• Construction of a 31P NMR apparatus using a superconducting magnet and Fourier transform NMR components.
• Observation of principal signals from phosphocreatine and inorganic phosphate in tissues.
• Experimental application to human forearms, legs, and animal brains (dog, rabbit).

Main Results:

• The apparatus successfully detected tissue normoxia and hypoxia.
• The phosphocreatine/phosphate ratio was a sensitive indicator of tissue hypoxia.
• Experiments confirmed the applicability of 31P NMR in humans and animals for metabolic assessment.

Conclusions:

• 31P NMR is a feasible method for continuous, noninvasive evaluation of cell bioenergetics.
• This technique can quantitatively determine oxygen delivery, mitochondrial function, and bioenergetic coupling in tissues.
• The developed apparatus is simple, inexpensive, and applicable to both humans and animals.