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Bcl‐2 overexpression delays caspase‐3 activation and rescues cerebellar degeneration in prion‐deficient mice that overexpress amino‐terminally truncated prion
Author(s) -
Nicolas Oriol,
Gavín Rosalina,
Braun Nathalie,
Ureña Jesús Mariano,
Fontana Xavier,
Soriano Eduardo,
Aguzzi Adriano,
Río José Antonio
Publication year - 2007
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.06-7827com
Subject(s) - programmed cell death , caspase , cerebellum , microbiology and biotechnology , apoptosis , biology , kinase , purkinje cell , neuroscience , genetics
Prnp knockout mice that overexpress an amino‐truncated form of PrPc (ΔPrP) are ataxic and display cerebellar cell loss and premature death. Studies on the molecular and intracellular events that trigger cell death in these mutants may contribute to elucidate the functions of PrPc and to the design of treatments for prion disease. Here we examined the effects of Bcl‐2 overexpression in neurons on the development of the neurological syndrome and cere‐bellar pathology of ΔPrP. We show that ΔPrP overexpression activates the stress‐associated kinases ERK1–2 in reactive astroglia, p38 and the phosphorylation of p53, which leads to the death of cerebellar neurons in mutant mice. We found that the expression of ΔPrP in cell lines expressing very low levels of PrPc strongly induces the activation of apoptotic pathways, thereby leading to caspase‐3 activation and cell death, which can be prevented by coexpressing Bcl‐2. Finally, we corroborate in vivo that neuronal‐directed Bcl‐2 overexpression in ΔPrP mice (ΔPrP Bcl‐2) markedly reduces caspase‐3 activation, glial activation, and neuronal cell death in cerebellum by improving locomotor deficits and life expectancy.—Nicolas, O., Gavín, R., Braun, N., Ureña, J. M., Fontana, X., Soriano, E., Aguzzi, A., del Río, J. A. Bcl‐2 overexpression delays caspase‐3 activation and rescues cerebellar degeneration in prion‐deficient mice that overexpress amino‐terminally trun‐cated prion. FASEB J. 21, 3107–3117 (2007)