Identification of proteins in the ceroid-like autofluorescent aggregates from liver lysosomes of Beige, a mouse model for human Chediak-Higashi syndrome.
Mol Genet Metab
; 99(4): 389-95, 2010 Apr.
Article
en En
| MEDLINE
| ID: mdl-20061169
Chediak-Higashi syndrome is characterized by oculocutaneous albinism, a bleeding tendency and severe recurrent infections. Age-dependent formations of autofluorescent ceroid-like substances have been noted in a variety of tissues. In this study, we isolated an autofluorescent ceroid-like aggregate from purified Beige mouse liver lysosomes and analyzed the composition of the aggregate by ion trap mass-spectrometry. In addition to lysosomal proteins, this aggregate contains proteins normally localized in the ER, mitochondria, peroxisomes, and the cytosol. Bip, a luminal ER protein was abundant in lysosomal ceroid. The ER, mitochondria, and cytosol proteins could arise in lysosomes through stimulation of autophagy, but we found no differences between normal and CHS fibroblasts in the degree of lysosomal acidity and in the level of conversion of soluble microtubular-associated protein 1 light chain 3 type I to membrane-associated type II, an accepted probe for hyper-autophagy suggesting that ceroid formation is unlikely to arise via this mechanism.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ceroide
/
Síndrome de Chediak-Higashi
/
Hígado
/
Lisosomas
Tipo de estudio:
Diagnostic_studies
Límite:
Animals
Idioma:
En
Revista:
Mol Genet Metab
Asunto de la revista:
BIOLOGIA MOLECULAR
/
BIOQUIMICA
/
METABOLISMO
Año:
2010
Tipo del documento:
Article
País de afiliación:
Canadá
Pais de publicación:
Estados Unidos