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Giant multinucleated macrophages occur in acute spinal cord injury
A Leskovar1, J Turek, R B Borgens
1Department of Basic Medical Sciences, Purdue University, West Lafayette, Ind 47907-1244, USA.
Abstract:
Using a cell-isolation and -culture procedure specific for macrophages, we report the existence of giant (more than 50 microm diameter), multinucleated macrophages within an acute, 5-day-old adult rat spinal cord injury. The size and multinuclearity of these isolated giant cells was confirmed using transmission electron microscopy. Giant macrophages are markers for long-term infection, disease, and chronic injury in other soft tissues and are unexpected in the acute inflammatory stage of central nervous system injury. To our knowledge, this descriptive report is the first confirming the existence of giant macrophages in any injured nervous tissue, with additional data suggesting some of these cells to be multinucleated.
Insights
Giant macrophages, large multinucleated cells, were discovered in acute rat spinal cord injuries. This finding is unexpected during the early inflammatory phase of central nervous system injury.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Macrophages are key immune cells involved in injury response.
- Giant macrophages are typically associated with chronic conditions, not acute injury.
- Their presence in acute central nervous system (CNS) injury is previously undocumented.
Purpose of the Study:
- To investigate the cellular response in acute rat spinal cord injury.
- To identify and characterize unusual cell types present during the early stages of CNS trauma.
- To report the novel existence of giant, multinucleated macrophages in acute spinal cord injury.
Main Methods:
- A specific cell-isolation and culture technique for macrophages was employed.
- Transmission electron microscopy was used to confirm cell size and multinuclearity.
- Analysis of cellular morphology in adult rat spinal cord injury models.
Main Results:
- The study identified giant macrophages (over 50 micrometers in diameter) in acute rat spinal cord injury.
- These cells were confirmed to be multinucleated.
- The presence of these cells challenges existing understanding of acute CNS inflammatory responses.
Conclusions:
- Giant, multinucleated macrophages exist in the acute phase of rat spinal cord injury.
- This finding represents the first report of such cells in injured nervous tissue.
- Their presence suggests a potentially complex and previously unrecognized immune response in acute CNS injury.