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Natural anti-chondrocyte cytotoxic activity in the mouse: supportive role of macrophages
1Department of Histology and Embryology, Warsaw Medical School, Poland.
Abstract:
The role of macrophages (M phi) in natural anti-chondrocyte cytotoxic activity of normal murine splenocytes (SPL) and peritoneal cells (PC) was examined by means of an 18-hr 51Cr-release assay. Removal of M phi by either plastic adherence or carbonyl iron and magnet resulted in significant (P less than 0.01) reduction of SPL-mediated lysis of chondrocytes. It, however, did not influence natural anti-YAC-1 leukemia activity. On the contrary, M phi-depleted suspensions of PC retained their anti-chondrocyte activity at the initial level. Neither adherent SPL nor adherent PC exerted significant anti-chondrocyte cytotoxicity. The activity of nonadherent SPL could be, however, restored by reconstitution with the graded numbers of syngeneic adherent spleen- or peritoneal cavity-derived cells. Restoration of anti-chondrocyte activity of nonadherent SPL to the level comparable with that of untreated SPL was achieved with about 10% of adherent cells. On the other hand, reconstitution of nonadherent PC did not result in an increase of chondrocyte lysis. Potentiation of nonadherent SPL activity was seen only with syngeneic M phi, and the latter could not be replaced by conditioned media which were generated in the 18-hr culture of adherent SPL or PC.
Insights
Macrophages (M phi) are crucial for natural anti-chondrocyte cytotoxicity in murine splenocytes (SPL), but not peritoneal cells (PC). Their removal significantly reduced SPL-mediated chondrocyte lysis, highlighting their specific role in this immune response.
Area of Science:
- Immunology
- Cell Biology
Background:
- Macrophages (M phi) are key immune cells involved in various cytotoxic activities.
- The specific role of M phi in natural anti-chondrocyte cytotoxicity remains to be fully elucidated.
Purpose of the Study:
- To investigate the involvement of macrophages (M phi) in the natural cytotoxic activity of murine splenocytes (SPL) and peritoneal cells (PC) against chondrocytes.
- To differentiate the M phi contribution to anti-chondrocyte activity versus anti-leukemia activity.
Main Methods:
- Utilized an 18-hour 51Cr-release assay to measure cytotoxic activity.
- Employing techniques like plastic adherence and carbonyl iron with magnet to deplete M phi.
- Assessed the effect of M phi depletion and reconstitution on SPL and PC anti-chondrocyte activity.
Main Results:
- Depletion of M phi significantly reduced SPL-mediated chondrocyte lysis (P < 0.01) but did not affect anti-YAC-1 leukemia activity.
- M phi-depleted PC retained their anti-chondrocyte activity.
- Reconstitution of nonadherent SPL with syngeneic M phi restored anti-chondrocyte cytotoxicity, an effect not observed with conditioned media.
Conclusions:
- Macrophages play a specific and essential role in the natural cytotoxic activity of splenocytes against chondrocytes.
- Peritoneal cell-derived macrophages do not appear to mediate this specific cytotoxic function.
- M phi-mediated anti-chondrocyte activity is dependent on cell-cell contact or M phi-derived factors, not soluble factors from other adherent cells.