[No authors listed]
ABSTRACT In response to stress, spiral ganglion neurons may remodel intracellular pools of DNA repair proteins. This hypothesis was addressed by determining the intracellular location of three classic DNA excision repair proteins (XPA, CSA, and XPC) within the neurons under normal conditions, one day after noise stress (105Â dB/4 hr) and following DNA repair adjuvant therapy with carboxy alkyl esters (CAEs; 160Â mg/kg/28Â days). Under normal conditions, three intracellular compartments were enriched with at least one repair protein. These intracellular compartments were designated nuclear, cytoplasmic, and perinuclear. After the noise stress each repair protein aggregated in the cytoplasm. After CAE therapy each intracellular compartment was enriched with the three DNA repair proteins. Combining noise stress with CAE therapy resulted in the enrichment of at least two repair proteins in each intracellular compartment. The combined results suggest that in response to noise stress and/or otoprotective therapy, spiral ganglion neurons may selectively remodel compartmentalized DNA repair proteins.
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