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Quantitative mass spectrometric analysis of the mouse cerebral cortex after ischemic stroke. | LitMetric

AI Article Synopsis

  • * Researchers used TMT-isobaric mass tagging and mass spectrometry on mouse brain samples after a stroke to identify and quantify 2,690 proteins, revealing significant changes in 65% of the top proteins.
  • * The study found changes in key cellular functions; specifically, organelle outer membrane proteins were downregulated, while proteins related to translation and signaling pathways were upregulated, highlighting important molecular mechanisms for recovery after a stroke.

Article Abstract

Ischemic strokes result in the death of brain tissue and a wave of downstream effects, often leading to lifelong disabilities or death. However, the underlying mechanisms of ischemic damage and repair systems remain largely unknown. In order to better understand these mechanisms, TMT-isobaric mass tagging and mass spectrometry were conducted on brain cortex extracts from mice subjected to one hour of middle cerebral artery occlusion (MCAO) and after one hour of reperfusion. In total, 2,690 proteins were identified and quantified, out of which 65% of the top 5% of up- and down-regulated proteins were found to be significant (p < 0.05). Network-based gene ontology analysis was then utilized to cluster all identified proteins by protein functional groups and cellular roles. Although three different cellular functions were identified-organelle outer membrane proteins, cytosolic ribosome proteins, and spliceosome complex proteins-several functional domains were found to be common. Of these, organelle outer membrane proteins were downregulated whereas cytosolic ribosome and spliceosome complex proteins were upregulated, indicating that major molecular events post-stroke were translation-associated and subsequent signaling pathways (e.g., poly (ADP-ribose) (PAR) dependent cell death). By approaching stroke analyses via TMT-isobaric mass tagging, the work herein presents a grand scope of protein-based molecular mechanisms involved with ischemic stroke recovery.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7173877PMC
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0231978PLOS

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