Cellular expression of (R127W)HSPB1 and its co-localization with neurofilament light chain.
- Author:
Ru-xu ZHANG
1
;
Xi YANG
;
Xiao-hong ZI
;
Xiao-bo LI
;
Kun XIA
;
Ting LIU
;
San-mei LIU
;
Lin LI
;
Ya-jing ZHAN
;
Lan LI
;
Qian PAN
;
Bei-sha TANG
Author Information
- Publication Type:Journal Article
- MeSH: Base Sequence; Charcot-Marie-Tooth Disease; genetics; metabolism; Gene Expression Regulation; Genetic Vectors; genetics; HSP27 Heat-Shock Proteins; genetics; metabolism; HeLa Cells; Humans; Intracellular Space; metabolism; Mutant Proteins; genetics; metabolism; Neurofilament Proteins; metabolism; Protein Binding; genetics; Protein Transport; Transfection
- From: Chinese Journal of Medical Genetics 2011;28(5):496-500
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo observe the cellular expression of (R127W) HSPB1 and its influence on neurofilament light chain (NFL) self-assembly and co-localization with NFL.
METHODSEukaryotic expression vectors pEGFPN1-(wt) HSPB1 and pEGFPN1- (R127W) HSPB1 were constructed. Hela cells were transiently transfected with pEGFPN1-(wt) HSPB1 or pEGFPN1- (R127W) HSPB1 and observed under a confocal microscope. Hela cells were also transiently co-transfected with Pcl-NFL and pEGFPN1-(wt)HSPB1, or pCL-NFL and pEGFPN1-(R127W)HSPB1. The self-assembly of NFL was observed and the co-localization study of HSPB1/ (R127W)HSPB1 with NFL was carried out in these two cell models by immunofluorescence technique.
RESULTSThe aggregates formed by EGFP-(R127W)HSPB1 predominantly located around the nucleus, and EGFP-(wt)HSPB1 showed diffusion pattern in Hela cells. When co expressed with EGFP-(wt)HSPB1, NFL formed homogeneous structure in cytosol. When co-expressed with EGFP-(R127W)HSPB1, however, NFL had amorphous staining pattern predominantly consisting of NFL aggregates, and NFL co-localized with (R127W)HSPB1 in these aggregates.
CONCLUSIONThe R127W mutant of HSPB1 may have reduced capacity to serve as a chaperone to prevent aggregate formation, and fail to correctly organize the neurofilament network. Dysfunction of the axon cytoskeleton and axon transport may be the primary mechanism of R127W mutation of HSPB1 in the pathogenesis of Charcot-Marie-Tooth disease.
