Furthermore, ligand and receptor internalisations were mutually dependent upon each other since Fra puncta were lost in netAB Δ mutants and NetB puncta were lost in fra mutants.
Figitumumab blocks the binding of IGF-1 to IGF-IR, inhibits the downstream signalling activated by both IGF-1 and IGF-2, and induces prolonged receptor internalisation and degradation (Cohen et al, 2005).
All of these compounds induced a rapid and persistent receptor internalisation similar to that induced by oxytocin (Guzzi et al, 2002).
One surprising FCS observation, given significant Y1 receptor and Y2H155P receptor internalisation, was that measurements of surface receptor particle concentration in all four cell lines were not significantly altered by NPY treatment (Fig. 3B).
Thus different receptor binding and selective internalisation may account for the enhanced immunogenicity of different HSPs, and upon internalisation, the HSP bound peptide can be taken into the vacuolar/endocytic or cytosolic pathway of cross-presentation.
The advantage of ligand-directed toxins is that PE38KDEL-mediated cytotoxicity requires specific ligand-receptor binding and subsequent internalisation.
The MR is a type-1 membrane protein with a single transmembrane domain and a cytoplasmic domain that mediates receptor internalisation and recycling [ 49].
Irradiation causes EGFR receptor internalisation and transport into the nucleus, binding of the receptor to the catalytic subunit of DNA protein kinase, and subsequent repair of the lethal double-strand DNA breaks that result from radiation (Dittmann et al, 2005).
However, the expression of dynamin 1, which is required for receptor internalisation, and of hexokinase, and pyruvate carboxylase were specifically changed in tumour-bearing mice with anorexia.
Thus, by using these three cell lines, we included all necessary controls for the in vitro and in vivo evaluation and our cell uptake studies demonstrated receptor selective binding and internalisation of [F]FProp-C*RRETAWAC*-OH only for the DU145, therefore nicely confirming the receptor binding studies on isolated purified integrins.
