Figure 7.
Concentration of ß-Actin Protein within Growth Cones Following
NT-3 Stimulation Is Dependent on Sequences within the ß-Actin
3'UTR
(A) Neurons were starved for 3 hr and treated with
NT-3 in the presence of antisense or control oligonucleotides for
90 min and then stained for ß-actin by immunofluorescence. Antisense
treatment inhibited the enrichment of ß-actin protein within
growth cones whereas the control treatment resulted in a 75% increase
in the fluorescence intensity for ß-actin protein (Student's
t test: p < 0.01 when “control” group was compared
to “control/NT-3” group).
(B) Neurons were transfected with ß-actin-EGFP
fusion constructs, with and without the ß-actin mRNA 3'UTR,
and then starved for 3 hr and treated with NT-3 for 90 min. Higher
levels of ß-actin-EGFP fluorescent intensity were observed within
growth cones from the construct that contained the ß-actin 3'UTR
compared to the construct without the 3'UTR (p < 0.01).