Related Experiment Videos
Temporal changes after death in primate diaphragm muscle oxidative enzyme activity
The American Review of Respiratory Disease
|December 1, 1984
Summary
Diaphragm muscle fibers in human infants and baboons show similar oxidative capacity. However, postmortem sample degradation affects histochemical results, highlighting the importance of timely analysis for accurate muscle fiber research.
Area of Science:
- Physiology
- Histochemistry
- Comparative Anatomy
Background:
- Previous studies on baboon diaphragm muscle fibers reported high oxidative capacity, contrasting with findings in human infant autopsy specimens.
- Divergent interpretations may stem from species differences or the use of autopsy samples versus fresh tissue.
Purpose of the Study:
- To investigate differences in human infant and premature baboon diaphragm muscle fiber characteristics.
- To determine the impact of postmortem interval on histochemical analysis of diaphragm muscle fibers.
Main Methods:
- Diaphragm muscle samples from premature, newborn, and adult baboons were collected immediately or after 24-hour storage.
- Human infant diaphragm samples were obtained at autopsy (4-24 hours postmortem).
- Histochemical assay for Nicotinamide Adenine Dinucleotide (NADH) Tetrazolium Reductase (TR) activity was performed on cross-sections.
Main Results:
- Baboon muscle samples showed deterioration with storage, with premature and newborn samples being more susceptible than adult samples.
- Human infant diaphragm fibers analyzed within 10 hours postmortem closely resembled those of infant baboons.
- Samples analyzed later postmortem exhibited fiber deterioration and reduced oxidative enzyme activity.
Conclusions:
- Human and nonhuman primate diaphragm muscle fibers share similar enzymatic profiles.
- The time elapsed after death significantly impacts the intensity of mitochondrial enzyme assays.
- Tissue preservation is better maintained in more mature muscles, with less pronounced degradation over time.