Abstract
Parkinson’s disease (PD) is one of the most common neurodegenerative diseases. Genes which have been implicated in autosomal-recessive PD include PARK2 which codes for parkin, an E3 ubiquitin ligase that participates in a variety of cellular activities. In this study, we compared parkin-mutant primary fibroblasts, from a patient with parkin compound heterozygous mutations, to healthy control cells. Western blot analysis of proteins obtained from patient’s fibroblasts showed quantitative differences of many proteins involved in the cytoskeleton organization with respect to control cells. These molecular alterations are accompanied by changes in the organization of actin stress fibers and biomechanical properties, as revealed by confocal laser scanning microscopy and atomic force microscopy. In particular, parkin deficiency is associated with a significant increase of Young’s modulus of null-cells in comparison to normal fibroblasts. The current study proposes that parkin influences the spatial organization of actin filaments, the shape of human fibroblasts, and their elastic response to an external applied force.
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Abbreviations
- α-Tub:
-
α-Tubulin
- AFM:
-
Atomic force microscopy
- CLSM:
-
Confocal laser scanning microscopy
- ABPs:
-
Actin-binding proteins
- COF:
-
Cofilin
- F-actin:
-
Filamentous actin
- Gsk-3:
-
Glycogen synthase kinase-3
- PD:
-
Parkinson’s disease
- CTR:
-
Healthy control
- P1:
-
PD patient
- siRNAs:
-
Interfering RNAs
- LIMK:
-
LIM kinase
- MLC:
-
Myosin light chain
- p-COF:
-
Phosphorylated cofilin
- Akt:
-
Protein kinase B
- PAK:
-
Rac-Cdc42 p21-activated kinase
- ROI:
-
Region of interest
- ROCK:
-
Rho associated kinase
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Acknowledgments
This work was supported by the PON project 254/Ric. “Implementation of human and environment health research center”, Cod. PONa3_00334, REA research Grant no PITN-GA-2012-316549 (IT LIVER) from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007-2013), PRIN 2010FPTBSH “NANO Molecular technologies for Drug delivery - NANOMED”, Cod. PON02_00563_3448479-F “RINOVATIS”, and Cod. PONa3_00134 “Omics and nanotechnology for early diagnosis of human diseases - ONEV”. LLdM thanks Prof. Arezki Boudaoud for useful discussions about FibrilTool.
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Daniele Vergara, Marzia M. Ferraro and Mariafrancesca Cascione have contributed equally to this work.
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Vergara, D., Ferraro, M.M., Cascione, M. et al. Cytoskeletal Alterations and Biomechanical Properties of parkin-Mutant Human Primary Fibroblasts. Cell Biochem Biophys 71, 1395–1404 (2015). https://doi.org/10.1007/s12013-014-0362-1
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DOI: https://doi.org/10.1007/s12013-014-0362-1