Proteomics identification of proteins in human cortex using multidimensional separations and MALDI tandem mass spectrometer.
It is essential to characterize the proteome of various regions of human brain because most, if not all, neurodegenerative diseases are region-specific. Here we report an in-depth proteomics identification of proteins extracted from the frontal cortex, a region playing a critical role in cognitive function. The integrated proteomics analytical flow consisted of biochemical fractionation, strong cation exchange chromatography, reverse phase liquid chromatography, and MALDI-TOF/TOF mass spectrometric analysis. In total, 812 proteins were confidently identified with two or more peptides. These proteins demonstrated diverse isoelectric points and molecular weights and are involved in several molecular functions, including protein binding, catalytic activity, transport, structure, and signal transduction. A number of proteins known to be associated with neurodegenerative diseases were also identified. Detailed characterization of these proteins will supply the necessary information to appropriately interpret proteins associated with aging and/or age-related neurodegenerative diseases. Finally 140 proteins found in the cortical proteome were present in the proteome of cerebrospinal fluid, providing tissue-specific candidates for biomarker discovery in body fluid.
Pan
Sheng
S
Department of Pathology, University of Washington School of Medicine, Seattle, Washington 98104, USA.
Shi
Min
M
Jin
Jinghua
J
Albin
Roger L
RL
Lieberman
Andy
A
Gearing
Marla
M
Lin
Biaoyang
B
Pan
Catherine
C
Yan
Xiaowei
X
Kashima
Daniel T
DT
Zhang
Jing
J
D000368:Aged; D002540:Cerebral Cortex / Q000737:chemistry*; D002556:Cerebrospinal Fluid Proteins / Q000032:analysis / Q000737:chemistry; D005260:Female; D006801:Humans; D008297:Male; D008970:Molecular Weight; D010455:Peptides / Q000737:chemistry / Q000302:isolation & purification; D011506:Proteins / Q000032:analysis* / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification*; D020543:Proteome / Q000032:analysis / Q000737:chemistry; D040901:Proteomics / Q000379:methods*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D053719:Tandem Mass Spectrometry
D002556:Cerebrospinal Fluid Proteins; D010455:Peptides; D011506:Proteins; D020543:Proteome