Abstract
In this study we have taken advantage of the high nuclear responsiveness of type A sensory ganglia neurons to variations of cellular activity to investigate the reorganization and dynamics of nuclear compartments involved in transcription and RNA processing in response to neuronal injury. As experimental model we have used the inflammatory injury of the peripheral nerve endings induced by formalin injection in the areas of ophthalmic/maxillary nerve distribution. We have performed immunofluorescence and confocal laser microscopy analysis with specific antibodies for different nuclear compartments and ultrastructural analysis. The initial response to neuronal injury, within the 3 days post-injury, consisted of chromatin condensation, reduction in the expression level of acetylated histone H4, accumulation of perichromatin granules, reorganization of splicing factors in prominent nuclear speckles, reduction in the number of Cajal bodies and nucleolar alterations. These changes tended to revert by day 7 post-injury and are consistent with a transient inhibition of transcription and RNA processing. Moreover, we have observed an early and sustained expression of the transcription factor c-Jun. These results illustrate the transcription-dependent organization of nuclear compartments in type A trigeminal neurons and also support the importance of the nuclear response to axonal injury as a key component in the regenerative capacity of this neuronal population.
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Navascues, J., Casafont, I., Villagra, N.T. et al. Reorganization of nuclear compartments of type A neurons of trigeminal ganglia in response to inflammatory injury of peripheral nerve endings. J Neurocytol 33, 393–405 (2004). https://doi.org/10.1023/B:NEUR.0000046570.90442.43
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DOI: https://doi.org/10.1023/B:NEUR.0000046570.90442.43