Abstract
1. Normal differentiation of PC 12 cells and dorsal root ganglionic neurons in culture need nerve growth factor (NGF) for their neurite outgrowth. 2. An antibody against GM3 ganglioside was found to inhibit the nerve growth factor mediated neurite formation of both the cells in vitro significantly. 3. Further analysis revealed that the binding of 125I-NGF to live PC 12 cells could be markedly inhibited by anti-GM3 antibody in a dose dependent manner. 4. Scatchard analysis revealed that in the presence of anti-GM3 antibody only some low affinity binding sites were available for NGF-high affinity binding sites were totally blocked. 5. These results further strengthen the hypothesis that anti-GM3 antibody affects neuronal cell growth by interfering with the coupling of growth factors to their cell surface receptors.
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