Abstract：
:Neural injury triggers changes in the expression of a large number of gene families. Particularly interesting are those encoding proteins involved in the generation, propagation or restoration of electric potentials. The expression of the Na+, K+-ATPase subunit isoforms (alpha, beta and gamma) was studied in dorsal root ganglion (DRG) and sciatic nerve of the rat in normal conditions, after axotomy and during regeneration. In normal DRG, alpha1 and alpha2 are expressed in the plasma membrane of all cell types, while there is no detectable signal for alpha3 in most DRG cells. After axotomy, alpha1 and alpha2 expression decreases evenly in all cells, while there is a remarkable onset in alpha3 expression, with a peak about day 3, which gradually disappears throughout regeneration (day 7). beta1 Is restricted to the nuclear envelope and plasma membrane of neurons and satellite cells. Immediately after injury, beta1 shows a homogeneous distribution in the soma of neurons. No beta2 expression was found. Beta3 Specific immunofluorescence appears in all neurons, although it is brightest in the smallest, diminishing progressively after injury until day 3 and, thereafter, increasing in intensity, until it reaches normal levels. FXYD7 is expressed weakly in a few DRG neurons (less than 2%) and Schwann cells. It increases intensely in satellite cells immediately after axotomy, and in all cell types at day 3. Transient switching of members of the Na+, K+-ATPase isoform family elicited by axotomy suggests variations in the sodium pump isozymes with different affinities for Na+, K+ and ATP from those in intact nerve. This adaptation may be important for regeneration.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Arteaga MF,Gutiérrez R,Avila J,Mobasheri A,Díaz-Flores L,Martín-Vasallo Pdoi
10.1016/j.neuroscience.2004.08.041keywords:
subject
Has Abstractpub_date
2004-01-01 00:00:00pages
691-702issue
3eissn
0306-4522issn
1873-7544pii
S0306-4522(04)00767-5journal_volume
129pub_type
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