Synergistic induction of cytotoxicity in macrophages by murine interferon-γ and biological response modifiers derived from microorganisms
✍ Scribed by Shin-ichi Nagao; Keiki Sato; Yasuaki Osada
- Publisher
- Springer-Verlag
- Year
- 1986
- Tongue
- English
- Weight
- 598 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0340-7004
No coin nor oath required. For personal study only.
✦ Synopsis
The ability of recombinant murine interferon-gamma (rMuIFN-gamma) to activate murine macrophages with or without several biological response modifiers (BRM), including synthetic muramyl dipeptide derivatives (MDPs), was investigated. Mouse peritoneal macrophages were activated by rMuIFN-gamma alone to the cytostatic state, but not the cytolytic state. Other BRM as well as bacterial lipopolysaccharide (LPS), including a lyophilized preparation of an attenuated strain of Streptococcus hemolyticus, a cell wall skeleton of bacillus Calmette-Guerin and synthetic MDPs, were highly active in generating the synergism with rMuIFN-gamma. Macrophages were endowed with the cytolytic activities by combinations of rMuIFN-gamma and MDP-Lys(L18); the combination of 100 U/ml of rMuIFN-gamma with 10 ng/ml of MDP-Lys(L18) was sufficient to induce cytolytic activities in macrophages. The synergism was observed when the macrophages primed with rMuIFN-gamma were treated with LPS or MDP-Lys(L18), but not when the sequence of treatment was reversed. The cytotoxicity of macrophages induced by rMuIFN-gamma with MDP-Lys(L18) was suppressed by priming with MDP-Lys(L18). The suppressive effect was also observed by priming with LPS in combinations of rMUIFN-gamma and LPS. The reason for the suppression of macrophage activation by priming with LPS and MDP-Lys(L18) is at present unknown.