BACKGROUND: Recent studies indicate that the innate component of immune defense plays an important role in the establishment of antigen-specific immune response. We have previously isolated a novel mouse gene tag7/PGRP that was shown to be involved in the innate component of the immune system, and its insect homologue is an upstream mediator of Toll signaling in Drosophila. METHODS: Transiently or stably genetically modified mouse tumor cell lines expressing Tag7 were used. Tumor growth rate and animal survival were analyzed. Possible effector cells involved in tumor suppression were detected immunohistochemically. RESULTS: Transfection of mammary gland adenocarcinoma cells with the tag7 cDNA did not alter their growth rate in vitro but diminished their tumorogenicity in vivo in syngeneic and immunodeficient animals. Increased incidence of apoptosis was registered in the modified tumors. Transient expression of Tag7 by mouse melanoma M3 cells elicited protective immunity against parental tumor cells. Immunohistochemical analysis revealed that tumors after immunization with the genetically modified cells were infiltrated with Mac1(+) cells, B220(+) cells, and NK cells. Using nude mice we observed rejection of modified cells, but did not detect memory formation. CONCLUSIONS: We can conclude that secretion of the Tag7 protein by genetically modified cells can induce mobilization of antigen-presenting cells and innate effectors. Memory mechanisms are mediated by T cell response. For the first time our results demonstrate that local secretion of Tag7-the molecule involved in innate immunity-may play an important role in the induction of effective antitumor response in mice. Copyright 2004 John Wiley & Sons, Ltd.
BACKGROUND: Recent studies indicate that the innate component of immune defense plays an important role in the establishment of antigen-specific immune response. We have previously isolated a novel mouse gene tag7/PGRP that was shown to be involved in the innate component of the immune system, and its insect homologue is an upstream mediator of Toll signaling in Drosophila. METHODS: Transiently or stably genetically modified mousetumor cell lines expressing Tag7 were used. Tumor growth rate and animal survival were analyzed. Possible effector cells involved in tumor suppression were detected immunohistochemically. RESULTS: Transfection of mammary gland adenocarcinoma cells with the tag7 cDNA did not alter their growth rate in vitro but diminished their tumorogenicity in vivo in syngeneic and immunodeficient animals. Increased incidence of apoptosis was registered in the modified tumors. Transient expression of Tag7 by mousemelanoma M3 cells elicited protective immunity against parental tumor cells. Immunohistochemical analysis revealed that tumors after immunization with the genetically modified cells were infiltrated with Mac1(+) cells, B220(+) cells, and NK cells. Using nude mice we observed rejection of modified cells, but did not detect memory formation. CONCLUSIONS: We can conclude that secretion of the Tag7 protein by genetically modified cells can induce mobilization of antigen-presenting cells and innate effectors. Memory mechanisms are mediated by T cell response. For the first time our results demonstrate that local secretion of Tag7-the molecule involved in innate immunity-may play an important role in the induction of effective antitumor response in mice. Copyright 2004 John Wiley & Sons, Ltd.
Authors: L O Skorodumova; M I Lukashina; L E Sal'nikova; O A Tikhonova; S Yu Ivanov; S S Larin Journal: Dokl Biochem Biophys Date: 2014-01-03 Impact factor: 0.788
Authors: Denis V Yashin; Olga K Ivanova; Natalia V Soshnikova; Anton A Sheludchenkov; Elena A Romanova; Elena A Dukhanina; Alexander G Tonevitsky; Nikolai V Gnuchev; Alexander G Gabibov; Georgii P Georgiev; Lidia P Sashchenko Journal: J Biol Chem Date: 2015-07-16 Impact factor: 5.157
Authors: E A Dukhanina; T I Lukyanova; E A Romanova; V Guerriero; N V Gnuchev; G P Georgiev; D V Yashin; L P Sashchenko Journal: Cell Cycle Date: 2015 Impact factor: 4.534
Authors: E A Dukhanina; D V Yashin; T I Lukjanova; E A Romanova; O D Kabanova; Yu V Shatalov; L P Sashchenko; N V Gnuchev Journal: Dokl Biol Sci Date: 2007 May-Jun