Naslov
Ultrastructural analysis and TUNEL demonstrate motor neuron apoptosis in Werdnig-Hoffmann disease

Autori
Šimić, Goran ; Šešo-Šimić, Đurđica ; Lucassen, Paul J. ; Islam, Atiqul ; Krsnik, Željka ; Cviko, Aida ; Jelašić, Dražen ; Barišić, Nina ; Winblad, Bengt ; Kostović, Ivica ; Krušlin, Božo

Izvornik
Journal of neuropathology and experimental neurology (0022-3069) 59 (2000), 5; 398-407

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
apoptosis; DNA fragmentation; electron microscopy; protein p53; spinal cord; proto-oncogene proteins c-bcl-2; Werdnig-Hoffmann disease

Sažetak
Werdnig-Hoffmann disease (WHD) is the most severe clinical type of spinal muscular atrophy characterized by loss of lower motor neurons and paralysis. We examined the hypothesis that disease pathogenesis is based on an inappropriate persistence of normally occuring motor neuron programmed cell death. The diagnosis of WHD was made on the basis of clinical findings, electromyoneurography, and biopsy, and further confirmed by mutation analysis of the survival motor neuron (SMN) and neuronal apoptosis inhibitory protein (NAIP) genes using PCR. We used ultrastructural analysis as well as TUNEL and ISEL methods to assess DNA fragmentation, and immunocytochemistry to identify expression of the apoptosis-related proteins bcl-2 and p53. A significant number of motor neurons in the spinal cord of children with WHD were shown to die by apoptosis. As revealed by TUNEL, dying neurons in WHD patients comprised 0.2%-6.4% of the neuron numbers counted. This finding contradicts earlier studies that failed to find such evidence and suggests that early blockade of prolonged motor neuron apoptosis may be a potential therapeutic strategy for WHD.

Izvorni jezik
Engleski

Znanstvena područja
Temeljne medicinske znanosti

POVEZANOST RADA