[The tissue survival problem in using current methods of morphological study]

Area of Science:

• Cellular biology
• Molecular biology
• Neuroscience

Context:

• Investigates cellular changes and RNA production in human brain and myocardial tissues after death.
• Examines the post-mortem interval (PMI) and its effects on cellular integrity and gene expression.

Purpose:

• To determine the time course of ultrastructural alterations and RNA synthesis in human neurons, myocytes, and endothelial cells.
• To establish a timeline for cellular degradation and residual molecular activity in post-mortem human tissues.

Summary:

• Ultrastructural changes in brain neurons begin within 4 hours post-mortem, with progressive nuclear and cytoplasmic degradation by 8 hours.
• Endothelial cells retain RNA-producing capacity between 4-13 hours post-mortem.
• Myocardial cells exhibit active RNA production at 4 hours, decreasing by 8 hours and ceasing by 13 hours post-mortem.

Impact:

• Provides critical data for forensic science, particularly in estimating the time of death.
• Enhances understanding of cellular resilience and molecular decay processes in post-mortem human tissues.
• Informs research on organ preservation and transplantation viability.