Postmortem changes in myoglobin content in organs

Area of Science:

• Forensic Pathology
• Biochemistry
• Toxicology

Background:

• Myoglobin, a protein found in muscle tissue, plays a role in oxygen storage.
• Understanding postmortem changes in myoglobin is crucial for forensic investigations.
• Previous studies have explored myoglobin's behavior after death, but specific organ dynamics require further clarification.

Purpose of the Study:

• To investigate postmortem changes in myoglobin concentrations in blood and various organs.
• To evaluate the potential of myoglobin levels in specific organs for estimating the postmortem interval.
• To elucidate the mechanisms behind postmortem myoglobin redistribution.

Main Methods:

• Animal experiments utilizing enzyme immunoassay.
• Immunohistochemical staining of human postmortem tissues.
• Analysis of myoglobin concentrations in blood, striated muscle, liver, kidney, thyroid gland, and lung at different postmortem intervals.

Main Results:

• Blood myoglobin concentrations increased drastically shortly after death.
• Striated muscle myoglobin concentrations remained unchanged up to 14 days postmortem.
• Myoglobin content increased in the liver and kidney by day 5-7, and markedly in the thyroid gland and lung by day 7, showing a near-linear logarithmic rise over time.

Conclusions:

• Postmortem myoglobin accumulation in organs like the thyroid and lung is significant.
• The increase is likely due to diffusion from striated muscle and/or blood distribution.
• Measuring myoglobin in the thyroid gland or lung is a promising method for estimating the postmortem interval.