Developmental regulation of homeobox gene expression in dorsal root ganglion neurons is not recapitulated during regeneration of the crushed sciatic nerve
The adult peripheral nervous system is able to regenerate after injury. Regeneration is associated with the expression of new genes and proteins. Proteins abundant in developing axons increase in expression after injury, whereas proteins involved in neurotransmission are downregulated. It has been h...
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Veröffentlicht in: | Neuroscience 2004, Vol.125 (3), p.645-650 |
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Sprache: | eng |
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Zusammenfassung: | The adult peripheral nervous system is able to regenerate after injury. Regeneration is associated with the expression of new genes and proteins. Proteins abundant in developing axons increase in expression after injury, whereas proteins involved in neurotransmission are downregulated. It has been hypothesized that molecular mechanisms underlying regeneration-associated alterations in gene expression may be a recapitulation of developmental processes. These gene expression changes are likely to be regulated by changes in the gene expression of transcription factors. As homeobox genes play important roles in embryonic development of the nervous system, it makes them candidates for a regulatory role in the process of regeneration. Here we show that the relative mRNA expression levels of
Isl1 decreased shortly after crush, but those of
DRG11,
Lmx1b, and
Pax3 did not change after crush. These data indicate that the developmental expression patterns of the homeobox genes studied here are not recapitulated during regeneration of the dorsal root ganglia neurons. We conclude that developmental gene expression programs controlled by these homeobox genes are not directly involved in sciatic nerve regeneration. |
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ISSN: | 0306-4522 1873-7544 |
DOI: | 10.1016/j.neuroscience.2004.02.006 |