Naslov
Expression of glycosphingolipids in lymph nodes of mice lacking TNF receptor 1: biochemical and flow cytometry analysis

Autori
Marušić, Ana ; Markotić, Anita ; Kovačić, Nataša ; Müthing, Johannes

Izvornik
Carbohydrate research (0008-6215) 339 (2004); 77-86

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
glycosphingolipids; gangliosides; lymph nodes; TNF receptor 1; knockout mice; HPTLC immunostaining; flow cytometry

Sažetak
We investigated the expression of gangliosides and neutral glycosphingolipids (GSLs) in the lymph nodes of mice lacking the gene for the tumour necrosis factor-alpha receptor p55 (TNFR1). The GSL expression in the tissues of mice homozygous (TNFR1-/-) or heterozygous (TNFR1+/-) for the deletion was analysed by flow cytometry and high performance thin layer chromatography (HPTLC) followed by immunostaining with specific antibodies. HPTLC immunostaining revealed that lymph nodes from TNFR1-/- mice had reduced expression of ganglioside GM1b and GalNAc-GM1b, neolacto-series gangliosides, as well as the globo- (Gb3, Gb4 and Gb5) and ganglio-series (Gg3 and Gg4) neutral GSLs. Flow cytometry of freshly isolated lymph node cells showed no significant differences in GSL expression, except for the GalNAc-GM1b ganglioside, which was less abundant on T lymphocytes from TNFR1-/- lymph nodes. In TNFR1-/- mice, GalNAc-GM1b+/CD4+ T cells were two-fold less abundant (3.8% vs. 7.6% in the control mice), whereas GalNAc-GM1b+/CD8+ T cells were four-fold less abundant (5.0% vs. 20.2% in the control mice). This study provides in vivo evidence that TNF signalling via the TNFR1 is important for the activation of GM1b-type ganglioside biosynthetic pathway in CD8 T lymphocytes, suggesting its possible role in the effector T lymphocyte function.

Izvorni jezik
Engleski

Znanstvena područja
Temeljne medicinske znanosti

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