title: Proteomic analysis of immediate-early response plasma proteins after 70% and 90% partial hepatectomy.
abstract: OBJECTIVE
  Partial hepatectomy (PH) induces robust hepatic regenerative and metabolic responses that are considered to be triggered by humoral factors. The aim of the study was to identify plasma protein factors that potentially trigger or reflect the body's immediate-early responses to liver mass reduction.
  
  
  METHODS
  Male C57BL/6 mice were subjected to sham operation, 70% PH or 90% PH. Blood was collected from the inferior vena cava at 20, 60 and 180 min after surgery.
  
  
  RESULTS
  Using a label-free quantitative mass spectrometry-based proteomics approach, we identified 399 proteins exhibiting significant changes in plasma expression between any two groups. Of the 399 proteins, 167 proteins had multiple unique sequences and high peptide ID confidence (>90%) and were defined as priority 1 proteins. A group of plasma proteins largely associated with metabolism is enriched after 70% PH. Among the plasma proteins that respond to 90% PH are a dominant group of proteins that are also associated with metabolism and one known cytokine (platelet factor 4). Ninety percent PH and 70% PH induces similar changes in plasma protein profile.
  
  
  CONCLUSIONS
  Our findings enable us to gain insight into the immediate-early response of plasma proteins to liver mass loss. Our data support the notion that increased metabolic demands of the body after massive liver mass loss may function as a sensor that calibrates hepatic regenerative response.
authors.affiliation: Department of Biology, School of Science, Center for Regenerative Biology and Medicine, Indiana University-Purdue University Indianapolis.
authors.forename: Sudhanshu
authors.initials: S
authors.lastname: Kumar
authors.forename: Yuhong
authors.initials: Y
authors.lastname: Zou
authors.forename: Qi
authors.initials: Q
authors.lastname: Bao
authors.forename: Mu
authors.initials: M
authors.lastname: Wang
authors.forename: Guoli
authors.initials: G
authors.lastname: Dai
keywords: liver regeneration; partial hepatectomy; plasma proteomics