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Scientists identify 490 proteins in human blood serum

Researchers have identified or confirmed 490 proteins in human blood serum — nearly doubling the number of known serum proteins, according to a paper accepted for publication in the December issue of Molecular and Cellular Proteomics. “We have performed the most extensive identification of proteins in serum to date,” said Joel Pounds, corresponding author and a PNNL staff scientist. “We studied blood serum because it holds clues to all the major processes in our bodies. We need to know what proteins exist in that serum to know how they might be used to predict disease susceptibility, monitor disease progression or diagnose disease.” These clues include proteins that “leak” from dead and dying cells, and proteins secreted into blood or released from tumors. Identifying these proteins allows scientists to conduct additional studies to define each protein’s functional role in cells and the body.

Study first to show how tuberculosis moves through the body

A University of Washington study is the first to provide visualizations of tuberculosis infections in an intact living organism and reveals how tuberculous granulomas, the tight aggregates of macrophages that are the hallmarks of this infection, are formed within infected organisms (Macrophages are a specialized class of white blood cells that patrol tissues and ingest foreign particles, such as bacteria and viruses, as well as dead and dying cells. Macrophages provide the backbone of the immune system.)