Bortezomib is a new proteasome inhibitor with a high antitumor activity, but also with a potentially severe peripheral neurotoxicity. To establish a preclinical model and to characterize the changes induced on the peripheral nerves, dorsal root ganglia (DRG) and spinal cord, bortezomib was administered to Wistar rats (0.08, 0.15, 0.20, 0.30 mg/kg/day twice [2q7d] or three times [3q7d] weekly for a total of 4 weeks). At baseline, on days 14, 21 and 28 after the beginning the treatment period and during a 4-week follow-up period sensory nerve conduction velocity (SNCV) was determined in the tail of each animal. Sciatic nerve, DRG and spinal cord specimens were processed for light and electron microscope observations and morphometry. At the maximum tolerated dose bortezomib induced a significant reduction in SNCV, with a complete recovery at the end of the follow-up period. Sciatic nerve examination and morphometric determinations demonstrated mild to moderate pathological changes, involving predominantly the Schwann cells and myelin, although axonal degeneration was also observed. Bortezomib-induced changes were also observed in DRG and they were represented by satellite cell intracytoplasmatic vacuolization due to mitochondrial and endoplasmic reticulum damage, closely resembling the changes observed in sciatic nerve Schwann cells. Only rarely did the cytoplasm of DRG neurons has a dark appearance and clear vacuoles occurring in the cytoplasm. Spinal cord was morphologically normal. This model is relevant to the neuropathy induced by bortezomib in the treatment of human malignancies and it could be useful in increasing our knowledge regarding the mechanisms underlying bortezomib neurotoxicity.

Cavaletti, G., Gilardini, A., Canta, A., Rigamonti, L., RODRIGUEZ MENENDEZ, V., Ceresa, C., et al. (2007). Bortezomid-induced peripheral neurotoxicity: A neurophysiological and pathological study in the rat. EXPERIMENTAL NEUROLOGY, 204(1), 317-325 [10.1016/j.expneurol.2006.11.010].

Bortezomid-induced peripheral neurotoxicity: A neurophysiological and pathological study in the rat.

CAVALETTI, GUIDO ANGELO;GILARDINI, ALESSANDRA;CANTA, ANNALISA ROSANNA;RIGAMONTI, LAURA;RODRIGUEZ MENENDEZ, VIRGINIA;CERESA, CECILIA;MARMIROLI, PAOLA LORENA;BOSSI, MARIO;OGGIONI, NORBERTO;
2007

Abstract

Bortezomib is a new proteasome inhibitor with a high antitumor activity, but also with a potentially severe peripheral neurotoxicity. To establish a preclinical model and to characterize the changes induced on the peripheral nerves, dorsal root ganglia (DRG) and spinal cord, bortezomib was administered to Wistar rats (0.08, 0.15, 0.20, 0.30 mg/kg/day twice [2q7d] or three times [3q7d] weekly for a total of 4 weeks). At baseline, on days 14, 21 and 28 after the beginning the treatment period and during a 4-week follow-up period sensory nerve conduction velocity (SNCV) was determined in the tail of each animal. Sciatic nerve, DRG and spinal cord specimens were processed for light and electron microscope observations and morphometry. At the maximum tolerated dose bortezomib induced a significant reduction in SNCV, with a complete recovery at the end of the follow-up period. Sciatic nerve examination and morphometric determinations demonstrated mild to moderate pathological changes, involving predominantly the Schwann cells and myelin, although axonal degeneration was also observed. Bortezomib-induced changes were also observed in DRG and they were represented by satellite cell intracytoplasmatic vacuolization due to mitochondrial and endoplasmic reticulum damage, closely resembling the changes observed in sciatic nerve Schwann cells. Only rarely did the cytoplasm of DRG neurons has a dark appearance and clear vacuoles occurring in the cytoplasm. Spinal cord was morphologically normal. This model is relevant to the neuropathy induced by bortezomib in the treatment of human malignancies and it could be useful in increasing our knowledge regarding the mechanisms underlying bortezomib neurotoxicity.
Articolo in rivista - Articolo scientifico
bortezomib ; proteasome inhibitors; peripheral neuropathy; dorsal root ganglia; rat
English
317
325
Cavaletti, G., Gilardini, A., Canta, A., Rigamonti, L., RODRIGUEZ MENENDEZ, V., Ceresa, C., et al. (2007). Bortezomid-induced peripheral neurotoxicity: A neurophysiological and pathological study in the rat. EXPERIMENTAL NEUROLOGY, 204(1), 317-325 [10.1016/j.expneurol.2006.11.010].
Cavaletti, G; Gilardini, A; Canta, A; Rigamonti, L; RODRIGUEZ MENENDEZ, V; Ceresa, C; Marmiroli, P; Bossi, M; Oggioni, N; D’Incalci, M; De Coster, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/28668
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