Neuropilin-1 binding
to cell surface heparan sulfate. A, CHO-K1
cells titrated with recombinant wild-type Nrp1 a1a2b1b2 protein. B,
Binding of wild-type Nrp1 a1a2b1b2 and mutants (1 μM) to CHO-K1
cells with and without treatment with heparin lyases I, II, and III
(HSase). Statistics denote a one-way ANOVA with Tukey’s multiple
comparison test. ** p < 0.002 and **** p < 0.0001. C, HUVECs were titrated with recombinant
wild-type Nrp1 a1a2b1b2 protein. D, Binding of wild-type Nrp1 a1a2b1b2
and mutant (3 μM) to HUVECs with and without HSase treatment.
Specific binding (total binding–nonspecific binding) is shown
for each condition in this figure. Statistics denote a two-way ANOVA
with Tukey’s multiple comparison test. * p < 0.033 and ** p < 0.002.