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A quantitative proteomic analysis of changes in protein expression accompanying the differentiation of P19 mouse embryonal carcinoma cells into neuron-like cells using isobaric tag technology coupled with LC-MS/MS revealed protein changes reflecting withdrawal from the cell cycle accompanied by a dynamic reorganization of the cytoskeleton and an up-regulation of mitochondrial biogenesis. Further study of quantitative changes in abundance of individual proteins in a purified mitochondrial fraction showed that most mitochondrial proteins increased significantly in abundance. A set of chaperone proteins did not participate in this increase, suggesting that neuron-like cells are relatively deficient in mitochondrial chaperones. We developed a procedure to account for differences in recovery of mitochondrial proteins during purification of organelles from distinct cell or tissue sources. Proteomic data supported by RT-PCR analysis suggests that enhanced mitochondrial biogenesis during neuronal differentiation may reflect a large increase in expression of PGC-1alpha combined with down-regulation of its negative regulator, p160 Mybbp1a.

A Quantitative Proteomic Analysis of Mitochondrial Participation in P19 Cell Neuronal Differentiation