PDLIM5 mediates PKCε translocation in PMA-induced growth cone collapse.

Growth cone collapse is a critical repulsive response to various guidance cues for axon guidance. Protein kinase C epsilon plays important regulation roles in such responses. Translocation of from cytoplasm to membrane is crucial to archive its regulatory roles in this process. We previously reported that PDLIM5 could selectively recruit duanyu1531ε to its specific substrate in neurons. However, the molecular mechanism of duanyu1531ε translocation in the neuronal growth cone collapse remains elusive. Here, we demonstrated that PDLIM5 and duanyu1531ε co-existed in the nerve growth cones. By interacting with α-actinin, but not β-actin or β-tubulin, PDLIM5 might contribute to regulation of remodeling of the microfilaments in neurons. Meanwhile, PDLIM5 could also bind to duanyu1531ε to form complexes in growth cones. In the primary cultured neurons, activation of duanyu1531ε by PMA resulted in translocation of both duanyu1531ε and PDLIM5 from cytoplasm to the membrane. Knockdown of either PDLIM5 or duanyu1531ε rescued the neuron from PMA-induced growth cone collapse. Furthermore, in neurons, application of PDLIM5 shRNA or over-expression of PDLIM5 LIM1-3 mutants reduced the amount of duanyu1531ε in the membrane. Together, these results suggest that PDLIM5 acts as a scaffold protein by mediated duanyu1531ε translocated to the membrane in PMA-induced growth cone collapse.

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