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Macrophages and resistance to JHM virus CNS infection
Abstract:
Thioglycollate elicited peritoneal exudate cells from resistant SJL mice, younger susceptible SJL mice, and susceptible ASW, BALB/c, and C57/BL6 mice all exhibit extrinsic antiviral activity. The active cell was characterized as a Thy 1.2 negative, Ia negative, radiation resistant adherent cell. The antiviral activity was not due to nonspecific cellular cytotoxicity directed against the susceptible cell nor interferon. Adherent PE cells from resistant and susceptible SJL mice were similar with respect to the number of phagocytes, nonspecific esterase containing, Fc, and C3b receptor bearing cells. Finally, extrinsic antiviral activity was not dependent upon intrinsic antiviral activity.
Insights
Resistant and susceptible mice possess extrinsic antiviral activity mediated by adherent peritoneal exudate cells. This activity is not linked to cellular cytotoxicity, interferon, or intrinsic antiviral defenses.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Peritoneal exudate cells (PECs) can exhibit antiviral properties.
- Understanding the cellular mechanisms of antiviral activity is crucial for developing therapeutic strategies.
Purpose of the Study:
- To characterize the cells responsible for extrinsic antiviral activity in mice.
- To determine the nature of this antiviral activity and its dependence on host susceptibility.
Main Methods:
- Thioglycollate elicitation of peritoneal exudate cells (PECs) from various mouse strains.
- Characterization of PECs using cell surface markers (Thy 1.2, Ia) and functional assays.
- Assessment of antiviral activity through cytotoxicity assays and interferon detection.
- Analysis of phagocyte content and receptor expression (Fc, C3b) on adherent PECs.
Main Results:
- Extrinsic antiviral activity was observed in PECs from both resistant and susceptible mouse strains.
- The active cell was identified as adherent, Thy 1.2 negative, Ia negative, and radiation resistant.
- Antiviral activity was not mediated by non-specific cellular cytotoxicity or interferon.
- Adherent PECs from resistant and susceptible SJL mice showed similar numbers of phagocytes and receptor-bearing cells.
- Extrinsic antiviral activity was independent of intrinsic antiviral activity.
Conclusions:
- Adherent peritoneal exudate cells mediate extrinsic antiviral activity in mice, irrespective of host resistance.
- The characterized cell type possesses unique properties, distinct from typical cytotoxic or interferon-producing cells.
- Further research into these cells may reveal novel antiviral mechanisms and therapeutic targets.