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The profile of platelet α‐granule released molecules affects postoperative liver regeneration
Author(s) -
Starlinger Patrick,
Haegele Stefanie,
Offensperger Florian,
Oehlberger Lukas,
Pereyra David,
Kral Julia B,
Schrottmaier Waltraud C.,
Badrnya Sigrun,
Reiberger Thomas,
Ferlitsch Arnulf,
Stift Judith,
Luf Florian,
Brostjan Christine,
Gruenberger Thomas,
Assinger Alice
Publication year - 2016
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.28331
Subject(s) - liver regeneration , platelet , granule (geology) , hepatectomy , von willebrand factor , liver function , portal venous pressure , endocrinology , medicine , chemistry , microbiology and biotechnology , biology , portal hypertension , regeneration (biology) , surgery , cirrhosis , resection , paleontology
Platelets promote liver regeneration through site‐specific serotonin release from dense granules, triggering proliferative signaling in hepatocytes. However, the effects of factors derived from platelet α‐granules on liver regeneration are unclear, because α‐granules contain bioactive molecules with opposing functions. Because α‐granule molecules are stored in separate compartments, it has been suggested that platelets selectively release their α‐granule content dependent on the environmental stimulus. Therefore, we investigated the pattern of circulating α‐granule molecules during liver regeneration in 157 patients undergoing partial hepatectomy. We measured plasma levels of α‐granule‐derived factors in the liver vein at the end of liver resection, as well as on the first postoperative day. We observed a rapid accumulation of platelets within the liver after induction of liver regeneration. Platelet count and P‐selectin (a ubiquitous cargo of α‐granules) were not associated with postoperative liver dysfunction. However, low plasma levels of vascular endothelial growth factor (VEGF), but high levels of thrombospondin 1 (TSP‐1), predicted liver dysfunction after resection. Patients with an unfavorable postoperative α‐granule release profile (high TSP‐1/low VEGF) showed substantially worse postoperative clinical outcomes. The unfavorable postoperative α‐granule release profile was associated with increased postoperative portal venous pressure and von Willebrand factor antigen levels as a marker for intrahepatic endothelial dysfunction. Conclusion : The postoperative profile of circulating platelet‐derived factors correlates with the ability of the remnant liver to regenerate. Portal venous pressure and intrahepatic endothelial dysfunction might account for the selective granule release profile. Selective modulation of platelet α‐granule release in patients may represent an attractive target for therapeutic interventions to improve liver regeneration and clinical outcomes after partial hepatectomy. (H epatology 2016;63:1675‐1688)