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DNA synthesis in peritoneal lymphoid cells. Indirect induction of changes
Abstract:
Changes were observed in the DNA-synthesising cells of the murine peritoneal cavity after a single subcutaneous injection of (1) fluid thioglycollate medium, (2) guinea-pig serum, (3) pertussis vaccine, (4) fresh egg albumen, (5) bovine albumin Fraction 5, (6) normal saline as control. The subcutaneous route was chosen in order to avoid direct peritoneal irritation. A total of 180 animals was employed, in six groups of 30 each, and in each group five animals per day were examined for six days. In all cases except the controls there was a significant increase in the number of DNA-synthesising cells in the peritoneal fluid, as measured in autoradiographs following incubation with tritiated thymidine. The labelled cells were predominantly lymphoid, some resembling the transitional cells of bone marrow. There was also a smaller number of labelled macrophages. Changes were maximal after thioglycollate. The peak percentage of labelled cells occurred on Day 1 after thioglycollate and egg albumen, on Day 2 after guinea-pig serum, and on Day 4 after pertussis vaccine and bovine albumin.
Insights
Subcutaneous injections of various substances, including thioglycollate and serum, significantly increased DNA-synthesizing cells in mouse peritoneal fluid. Lymphoid cells were the predominant type responding to these stimuli.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- The peritoneal cavity is a site of immune surveillance.
- Understanding cellular responses to inflammatory stimuli is crucial for immunology.
Purpose of the Study:
- To investigate the changes in DNA-synthesizing cells within the murine peritoneal cavity following subcutaneous administration of various substances.
- To characterize the cell types involved in the peritoneal response.
Main Methods:
- Subcutaneous injection of fluid thioglycollate medium, guinea-pig serum, pertussis vaccine, egg albumen, bovine albumin, or saline (control) into 180 mice.
- Daily examination of five animals per group for six days.
- Autoradiography following incubation with tritiated thymidine to measure DNA synthesis.
Main Results:
- A significant increase in DNA-synthesizing cells was observed in peritoneal fluid for all tested substances except saline.
- Predominantly lymphoid cells, some resembling bone marrow transitional cells, were labeled.
- A smaller population of labeled macrophages was also identified.
- Thioglycollate induced the most pronounced changes, with peak labeled cells on Day 1.
Conclusions:
- Subcutaneous administration of various agents induces a significant proliferative response of lymphoid cells and macrophages in the peritoneal cavity.
- The kinetics of this response vary depending on the administered substance.