Abstract
The study aimed to explore the neutrophil’s spatial distributions used to estimate the histological age of contused skeletal muscle, and assessed the accuracy of various indicators, such as the proportion of neutrophils, “neutrophil mean distance,” and distribution of neutrophils in areas of “contiguous contour lines.” Fifty-five Sprague–Dawley rats were divided randomly into a control group and contusion groups at 1, 1.5, 2, 3, 4, and 6 h, as well as 1, 3, 5, and 15 days, post-injury (n = 5 per group). Nuclei and neutrophils were detected by hematoxylin and eosin (HE) staining and immunohistochemical (IHC) staining. At 0–24 h after injury, the distribution of neutrophils at distances of 100, 200, 300, 400, 500, and 600 µm from adjacent blood vessels was determined, and the best samples were screened to estimate wound age. To estimate wound age as accurately as possible, Fisher discriminant analysis (FDA) of the proportion of neutrophils, neutrophil mean distance, and distribution of neutrophils was performed, and 100.0% and 95.0% of the original and cross-validated cases were correctly classified, respectively. The spatial distribution of neutrophils at different distances from adjacent blood vessels showed a strong correlation with the histological age of contusion skeletal muscle, and the combination of the proportion of neutrophils, neutrophil mean distance, and distribution of neutrophils could be used to accurately estimate wound age.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This work was supported by the Natural Science Foundation for Excellent Young Scientists of Shanxi Province (grant number 20191D211351) and the National Natural Science Foundation of China (grant number 81971795).
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QD conceived the idea and drafted the manuscript; LW and DL established animal model and immunohistochemical staining; JN interpreted the results and statistical analysis; XZ performed data collection; JS conceived the study and performed some interpretation of the results. All authors read and approved the final version of the manuscript.
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Du, Qx., Wang, L., Li, D. et al. Estimating the time of skeletal muscle contusion based on the spatial distribution of neutrophils: a practical approach to forensic problems. Int J Legal Med 136, 149–158 (2022). https://doi.org/10.1007/s00414-021-02690-0
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DOI: https://doi.org/10.1007/s00414-021-02690-0