Figure 2. VEGFR expression and activation by VEGF in cultured primary MNs.
Immunostaining of primary MNs for VEGFR2 (A) and the MN marker ChAT (B) demonstrates expression of VEGFR2 in MNs (C). Treatment with VEGF (250 ng/ml, 30 min) promotes activation of VEGFR2 as indicated by phosphorylation of Y951 (E) and Y1175 (G) throughout the MN cell body and axon (ChAT positive; arrows) upon VEGF stimulation. Phosphorylation is not seen in the absence of VEGF treatment (D, F). Scale bar 50 µm.