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  • Caspase activation in hair cells of the mouse utricle exposed to neomycin.

Caspase activation in hair cells of the mouse utricle exposed to neomycin.

The Journal of neuroscience : the official journal of the Society for Neuroscience (2002-09-28)
Lisa L Cunningham, Alan G Cheng, Edwin W Rubel
ABSTRACT

Aminoglycoside exposure results in the apoptotic destruction of auditory and vestibular hair cells. This ototoxic hair cell death is prevented by broad-spectrum caspase inhibition. We have used in situ substrate detection, immunohistochemistry, and specific caspase inhibitors to determine which caspases are activated in the hair cells of the adult mouse utricle in response to neomycin exposure in vitro. In addition, we have examined the hierarchy of caspase activation. Our data indicate that both upstream caspase-8 and upstream caspase-9, as well as downstream caspase-3 are activated in hair cells exposed to neomycin. The inhibition of caspase-9-like activity provided significant protection of hair cells exposed to neomycin, whereas the inhibition of caspase-8-like activity was not effective in preventing neomycin-induced hair cell death. In addition, caspase-9 inhibition prevented the activation of downstream caspase-3, whereas the inhibition of caspase-8 did not. These data indicate that caspase-9 is the primary upstream caspase mediating neomycin-induced hair cell death in this preparation.

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CaspaTag Caspase 3,7 In Situ Assay Kit, Fluorescein, The In Situ Caspase Detection Kit for Flow Cytometry use a novel approach to detect active caspases. The methodology is based on Fluorochrome Inhibitors of Caspases (FLICA).