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1989 ; 80
(2
): 141-9
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Tumor-specific T cells which form clusters with dendritic cells and tumor cells
and deliver macrophage-activating factors
#MMPMID2498248
Yamaguchi Y
; Inaba K
; Kawai J
; Kato T
; Nakamura S
; Uno K
; Muramatsu S
Jpn J Cancer Res
1989[Feb]; 80
(2
): 141-9
PMID2498248
show ga
T cells prepared from tumor (Meth A)-bearing mice were cocultured with homologous
tumor cells and splenic dendritic cells to enrich tumor-specific T cells by the
separation of clusters. T blasts generated from clusters were capable of
inhibiting the in vivo tumor cell growth. The culture supernatant of clustering
cells (CLSN) was effective in activating macrophages (M phi) to be cytostatic and
cytocidal against tumor cells. Moreover, it was found that CLSN contains at least
3 distinct factors; one was identified as interferon-gamma (IFN-gamma), and the
others are so far unidentified, but one acts synergistically with IFN-gamma,
possibly as the second signal, and the other cooperates with lipopolysaccharide
but not with IFN-gamma. We propose that the tumor-specific T cells secrete
soluble mediators which cooperate with each other in M phi activation against
tumor cells.