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Surguchov, A. et al.

Surguchov, Palazzo, Surgucheva,

Gamma synuclein: subcellular localization in neuronal and non-neuronal cells and effect on signal transduction.

Synucleins are small, highly conserved proteins in vertebrates, especially abundant in neurons and typically enriched in presynaptic terminals. alpha-Synuclein protein and a fragment of it, called NAC, have been found in association with pathological lesions of neurodegenerative diseases. Recently, mutations in a alpha-synuclein gene have been reported in families susceptible to an inherited form of Parkinson's diseases. In addition, alpha-synuclein has been implicated in the pathophysiology of other neurodegenerative diseases, including Alzheimer's disease and multiple system atrophy. Far less is known about other members of the synuclein family, beta- and gamma-synucleins. gamma-synuclein is up-regulated in several types of cancer and may affect the integrity of the neurofilament network, while its bovine ortholog, synoretin, activates the Elk-1 signal transduction pathway. In this paper, we present data about the localization and properties of human and bovine gamma-synuclein in several neuronal and non-neuronal cell cultures derived from ocular tissues. We show that gamma-synuclein is present in the perinuclear area and is localized to centrosomes in several types of human interphase cells and in bovine retinal pigment epithelium. In mitotic cells, gamma-synuclein staining is localized to the poles of the spindle. Further, overexpression of synoretin in retinoblastoma cells up-regulates MAPK and Elk-1. These results support the view that gamma-synuclein is a centrosome protein that may be involved in signal transduction pathways.[1]

References

Gamma synuclein: subcellular localization in neuronal and non-neuronal cells and effect on signal transduction. Surguchov, A., Palazzo, R.E., Surgucheva, I. Cell Motil. Cytoskeleton (2001) [Pubmed]

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