Abstract
Following injury to peripheral axons, besides increased cyclic adenosine monophosphate (cAMP), the positive injury signals extracellular-signal-regulated kinase (ERK), c-Jun N-terminal kinase (JNK), and signal transducer and activator of transcription 3 (STAT-3) are locally activated and retrogradely transported to the cell body, where they induce a pro-regenerative program. Here, to further understand the importance of injury signaling for successful axon regeneration, we used dorsal root ganglia (DRG) neurons that have a central branch without regenerative capacity and a peripheral branch that regrows after lesion. Although injury to the DRG central branch (dorsal root injury (DRI)) activated ERK, JNK, and STAT-3 and increased cAMP levels, it did not elicit gain of intrinsic growth capacity nor the ability to overcome myelin inhibition, as occurred after peripheral branch injury (sciatic nerve injury (SNI)). Besides, gain of growth capacity after SNI was independent of ERK and cAMP. Antibody microarrays of dynein-immunoprecipitated axoplasm from rats with either DRI or SNI revealed a broad differential activation and transport of signals after each injury type and further supported that ERK, JNK, STAT-3, and cAMP signaling pathways are minor contributors to the differential intrinsic axon growth capacity of both injury models. Increased levels of inhibitory injury signals including GSK3β and ROCKII were identified after DRI, not only in axons but also in DRG cell bodies. In summary, our work shows that activation and transport of positive injury signals are not sufficient to promote increased axon growth capacity and that differential modulation of inhibitory molecules may contribute to limited regenerative response.
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Acknowledgments
This work was funded by FEDER through COMPETE and by National funds through FCT—Fundação para a Ciência e a Tecnologia—under the Project FCOMP-01-0124-FEDER-017455 (HMSP ICT/0020/2010). F.M.M. is supported by FCT (SFRH/BPD/104503/2014). We thank Dr. Paula Sampaio (IBMC) for help with microscopy, Dr. Pedro Brites (IBMC) for providing myelin and for help in the analysis of the arrays, and Vera Sousa and Francisco Figueiredo for tissue processing.
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Supplementary Fig. 1
Vip is increased following SNI and DRI. Representative images of immunohistochemistry against Vip in L4,5 DRG from naïve animals or animals with either SNI or DRI; scale bar 20 μm. (JPEG 18 kb)
Supplementary Fig. 2
PTEN and PKCα are not altered upon SNI or DRI. Representative images of immunohistochemistry against PTEN in L4,5 DRG from naïve animals or animals with either SNI or DRI; scale bar 20 μm (a). Quantification of a (b). Representative images of immunohistochemistry against PKCα in L4,5 DRG from naïve animals or animals with either SNI or DRI; scale bar 20 μm (c). Quantification of c (d). Results represent the mean +/− SEM. (JPEG 35 kb)
Supplementary Table 1
Summary of the analysis of the Kinex™ Antibody Microarray. All the protein targets analyzed are listed (some targets were covered by multiple antibodies present in the microarray—not shown). Targets with a Z ratio > +/−1.0 (i.e., that met selection criteria), the Z ratio value is shown. For targets that did not meet the selection criteria, the Z ratio is indicated as ns (non-significant). (XLSX 35 kb)
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Mar, F.M., Simões, A.R., Rodrigo, I.S. et al. Inhibitory Injury Signaling Represses Axon Regeneration After Dorsal Root Injury. Mol Neurobiol 53, 4596–4605 (2016). https://doi.org/10.1007/s12035-015-9397-6
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DOI: https://doi.org/10.1007/s12035-015-9397-6