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  • Title: Decreased expressions of CD1d molecule on liver dendritic cells in subcutaneous tumor bearing mice.
    Author: Tatsumi T, Takehara T, Yamaguchi S, Sasakawa A, Yamamoto M, Fujita Y, Miyagi T, Ohkawa K, Hayashi N.
    Journal: J Hepatol; 2008 Nov; 49(5):779-86. PubMed ID: 18760855.
    Abstract:
    BACKGROUND/AIMS: Alpha-Galactosylceramide (alpha-GalCer) has been attracting attention as a novel approach to treat metastatic liver cancer. However, the activation of liver innate immunity by alpha-GalCer should be examined because clinical trials of alpha-GalCer resulted in limited clinical responses. METHODS: We examined the activation of liver innate immunity by alpha-GalCer in subcutaneous Colon26 tumor bearing-mice (C26s.c.TB-mice). RESULTS: The expressions of CD1d molecule on liver dendritic cells (DCs) were significantly lower in C26s.c.TB-mice than those in tumor-unbearing normal mice. Although liver NK cells and NKT cells activated in normal mice after alpha-GalCer treatment, the activation of these cells were significantly inhibited in C26s.c.TB-mice. Alpha-GalCer treatment resulted in significant antitumor effect against Colon26 metastatic liver tumor in normal mice, but not in C26s.c.TB-mice. The serum levels of TGF-beta, known to suppress the CD1d expressions on DCs, in C26s.c.TB-mice were significantly higher than those in normal mice. Surgical subcutaneous tumor mass reduction resulted in the reduction of serum TGF-beta, the recovery of CD1d expressions on liver DCs and the improvement of antitumor effect of alpha-GalCer against metastatic liver tumor. CONCLUSIONS: These results suggested that tumor burden reduces CD1d expressions on liver DCs, thus impeding alpha-GalCer-mediated NK cell activation and antitumor activity in the liver.
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