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Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
Published on: December 30, 2014
Macrophages of the sperm granuloma 3 months after vasectomy in the Albino Swiss rat
C M Tait1, J S McGinn, E W Milne
1Laboratory of Human Anatomy, University of Glasgow, Glasgow, Scotland.
Abstract:
This study documents the appearance and arrangement of the macrophages of the sperm granuloma 3 months after vasectomy in the Albino Swiss rat. We found, as have others, that the macrophages form a distinct layer in the granuloma wall, external to the central mass of extravasated spermatozoa. Those closest to the spermatozoa showed much phagocytosis. Many had two, three, or more nuclei. The largest macrophages, giant cells of the foreign body and Langhans types, were generally farther from the sperm mass, but retained evidence of phagocytic activity in the form of sperm fragments. Macrophages, either mono- or multinucleate, frequently showed numerous surface microridges that interdigitated with those of neighboring cells. The microridges varied in length, but were of uniform thickness and cytoplasmic content and were rarely branched. Monocytes were frequently observed, indicating continuing significant recruitment of cells of the macrophage series to the granuloma. We also noted mononucleate cells in the connective tissue external to the macrophage layer. Their cytology suggested they were macrophages, but they showed much less phagocytic activity than those of the main macrophage layer and had distinctive aggregations of moderately electron-dense droplets.
Insights
Following vasectomy, macrophages form a distinct layer around sperm granulomas in rats. These macrophages exhibit significant phagocytosis and varied nuclear arrangements, with some developing into giant cells.
Area of Science:
- Reproductive Biology
- Cellular Biology
- Immunology
Background:
- Vasectomy leads to the formation of sperm granulomas.
- Macrophages play a crucial role in the inflammatory response to extravasated sperm.
Purpose of the Study:
- To document the morphology and arrangement of macrophages within sperm granulomas 3 months post-vasectomy in Albino Swiss rats.
- To investigate the phagocytic activity and cellular characteristics of these macrophages.
Main Methods:
- Light and electron microscopy were used to examine sperm granulomas.
- Histological analysis of macrophage morphology, nuclear status, and arrangement was performed.
Main Results:
- Macrophages formed a distinct layer surrounding the sperm mass.
- Cells closest to sperm exhibited high phagocytic activity; multinucleated macrophages and giant cells were observed.
- Surface microridges on macrophages facilitated cell-cell interactions, and monocytes indicated ongoing recruitment.
Conclusions:
- Macrophages in rat sperm granulomas display specialized morphology and arrangement related to phagocytosis.
- The presence of monocytes suggests continuous immune cell activity and resolution of the granuloma.
