Murine Nod1 preferentially detects diaminopimelic acid‐type muramyl tetrapeptides. Murine Nod1 preferentially detects diaminopimelic acid‐type muramyl.

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Murine Nod1 preferentially detects diaminopimelic acid‐type muramyl tetrapeptides. Murine Nod1 preferentially detects diaminopimelic acid‐type muramyl tetrapeptides. (A,B) Mouse peritoneal macrophages from C57Bl6 (wild type (WT)) and Nod1−/− animals (A) or Nod2−/− animals (B) were stimulated overnight with lipopolysaccharide (LPS; 10 ng/ml), Pam3Cys4‐OH (Pam3, 1.5 ng/ml) or a selection of muramyl peptides (muramyl dipeptide (MDP), M‐TriDAP, Lactyl‐TetraDAP and tracheal cytotoxin (TCT); all at 250 nM) in the presence of 1 μM cytochalasin D to allow better stimulation by muramyl peptides, and tumour necrosis factor‐α (TNF‐α) secretion was measured by enzyme‐linked immunoabsorbent assay. Data are the mean±s.e.m. of duplicates and are representative of two independent experiments. (C,D) Human embryonic kidney (HEK)293 epithelial cells were transfected with muramyl peptides (M‐TriDAP, TriDAP, TCT, FK156, Lactyl‐TetraDAP, M‐TetraDAP, M‐TriLYS, M‐TetraLYS; all at 50 nM) together with expression vectors for either human Nod1 (hNod1) or mouse Nod1 (mNod1), and nuclear factor‐κB (NF‐κB) activation was measured as in Fig 1A. NS, nonstimulated; RLU, relative light units. (E) HEK293 epithelial cells were transfected with 50 nM muramyl peptides (mono (MurNAc‐l‐Ala), di (MDP), tri (M‐TriDAP), tetra (M‐TetraDAP) or penta (M‐PentaDAP)) together with expression vectors for hNod2, hNod1 or mNod1. NF‐κB activation was measured as in Fig 1A. For (C–E), data are the mean±s.e.m. of duplicates and are representative of three independent experiments. Joao Gamelas Magalhaes et al. EMBO Rep. 2005;6:1201-1207 © as stated in the article, figure or figure legend