Renal cell carcinoma-derived gangliosides suppress nuclear factor-kappaB activation in T cells.

Uzzo RG, Rayman P, Kolenko V, Clark PE, Cathcart MK, Bloom T, Novick AC, Bukowski RM, Hamilton T, Finke JH
J Clin Invest. 1999 104 (6): 769-76

PMID: 10491412 · PMCID: PMC408430 · DOI:10.1172/JCI6775

Activation of the transcription factor nuclear factor-kappaB (NFkappaB) is impaired in T cells from patients with renal cell carcinomas (RCCs). In circulating T cells from a subset of patients with RCCs, the suppression of NFkappaB binding activity is downstream from the stimulus-induced degradation of the cytoplasmic factor IkappaBalpha. Tumor-derived soluble products from cultured RCC explants inhibit NFkappaB activity in T cells from healthy volunteers, despite a normal level of stimulus-induced IkappaBalpha degradation in these cells. The inhibitory agent has several features characteristic of a ganglioside, including sensitivity to neuraminidase but not protease treatment; hydrophobicity; and molecular weight less than 3 kDa. Indeed, we detected gangliosides in supernatants from RCC explants and not from adjacent normal kidney tissue. Gangliosides prepared from RCC supernatants, as well as the purified bovine gangliosides G(m1) and G(d1a), suppressed NFkappaB binding activity in T cells and reduced expression of the cytokines IL-2 and IFN-gamma. Taken together, our findings suggest that tumor-derived gangliosides may blunt antitumor immune responses in patients with RCCs.

MeSH Terms (12)

Carcinoma, Renal Cell DNA-Binding Proteins Gangliosides Humans I-kappa B Proteins Immunosuppressive Agents Interferon-gamma Interleukin-2 Kidney Neoplasms NF-kappa B NF-KappaB Inhibitor alpha T-Lymphocytes

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