Abstract
Lysophosphatidic acid (LPA) is a bioactive lysophospholipid that causes neuronal growth cones to collapse and neurites to retract through a RhoA-ROCK mediated pathway. It has been reported that the NSAID ibuprofen improves regeneration after spinal cord injury through a mechanism of inhibiting RhoA. This leads to the hypothesis that ibuprofen should block LPA-mediated growth cone collapse. We tested this hypothesis by treating embryonic chick retinal neurons with ibuprofen followed by LPA. Retinal growth cones collapsed with LPA in the presence of ibuprofen similar to control; however, growth cone collapse was effectively blocked by a ROCK inhibitor. Thus, our results do not support the designation of ibuprofen as a direct RhoA inhibitor.
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Acknowledgements
We thank Eva Hermanova and Allison Reed for assistance with blind observer counts.
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This research was supported by grant REY024453A from the National Eye Institute, National Institutes of Health to E.B. and P20GM103499 (SC INBRE) from the National Institute of General Medical Sciences, National Institutes of Health and from Winthrop University Research Council.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by all authors; JV and EB performed and analyzed growth cone collapse assay data and AA and EB performed and analyzed time-lapse data. The first draft of the manuscript was written by EB and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Supplementary Movie 1 Time-lapse imaging of the chick retinal growth cone from Figure 5. A growth cone is observed growing initially under control conditions, then ibuprofen is added at 50 µM and the growth cone continues to grow. Finally, LPA is added to a concentration of 100 nM and the growth cone collapses and the neurite retracts. The time-lapse displayed encompasses 51 minutes with frames at 30 second intervals
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Vinton, J., Aninweze, A. & Birgbauer, E. Ibuprofen does not inhibit RhoA-mediated growth cone collapse of embryonic chicken retinal axons by LPA. Exp Brain Res 239, 2969–2977 (2021). https://doi.org/10.1007/s00221-021-06172-y
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DOI: https://doi.org/10.1007/s00221-021-06172-y