Genetic background influences UPR but not PLP processing in the rumpshaker model of PMD/SPG2.
Neurochem Res
; 32(2): 167-76, 2007 Feb.
Article
de En
| MEDLINE
| ID: mdl-16944321
ABSTRACT
Mutations of the proteolipid protein gene (PLP1) cause Pelizaeus-Merzbacher disease (PMD) and Spastic paraplegia type 2 (SPG2). The rumpshaker mutation is associated with mild forms of PMD or SPG2 in man and the identical mutation occurs in mice, the phenotype depending on genetic background. The mild phenotype in C3H mice becomes a lethal disease when expressed on the C57BL/6 background. rumpshaker PLP is synthesised at a similar rate to wild type but is rapidly degraded by the proteasome. We show that the rates of synthesis, degradation and myelin incorporation of PLP/DM20 are similar in mutants on both backgrounds and therefore differences in PLP processing are unlikely to be the basis of the phenotypic variation. An unfolded protein response (UPR) is activated in rumpshaker. Whereas activation of CHOP correlates with phenotypic severity, we find no difference in the response of BiP and X-box protein1 (Xbp1) between the two strains.
Recherche sur Google
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Protéine protéolipidique myéline
/
Gaine de myéline
/
Protéines de tissu nerveux
Type d'étude:
Prognostic_studies
Limites:
Animals
Langue:
En
Journal:
Neurochem Res
Année:
2007
Type de document:
Article
Pays d'affiliation:
Royaume-Uni