Improving engraftment of hepatocyte transplantation using alpha-1 antitrypsin as an immune modulator View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2019-04

AUTHORS

Charlotte Lee, Anil Dhawan, Valeria Iansante, Celine Filippi, Ragai Mitry, Joanne Tang, Simon Walker, Raquel Fernandez DaCosta, Siddharth Sinha, Robin D. Hughes, Maria Koulmanda, Emer Fitzpatrick

ABSTRACT

For patients with non-cirrhotic liver-based metabolic disorders, hepatocyte transplantation can be an effective treatment. However, long-term function of transplanted hepatocytes following infusion has not been achieved due to insufficient numbers of hepatocytes reaching the liver cell plates caused by activation of the instant blood-mediated inflammatory reaction (IBMIR). Our aim was to determine if the natural immune modulator, alpha-1 antitrypsin (AAT), could improve engraftment of transplanted hepatocytes and investigate its mechanism of action. A tubing loop model was used to analyse activation of the IBMIR when human hepatocytes were in contact with ABO-matched blood and 4 mg/ml AAT. Platelet and white cell counts, complement and cytokine expression were analysed. To determine if AAT could improve short-term engraftment, female rats underwent tail vein injection of AAT (120 mg/kg) or water (control) prior to the intrasplenic transplantation of 2 × 107 male hepatocytes. At 48 h and 1 week, livers were collected for analysis. In our loop model, human hepatocytes elicited a significant drop in platelet count with thrombus formation compared to controls. Loops containing AAT and hepatocytes showed no platelet consumption and no thrombus formation. Further, AAT treatment resulted in reduced IL-1β, IL-6 and IFN-γ and increased IL-1RA compared to untreated loops. In vivo, AAT significantly improved engraftment of rat hepatocytes compared to untreated at 48 h. AAT infusion may inhibit the IBMIR, thus improving short-term engraftment of donor hepatocytes and potentially improve the outcomes for patients with liver-based metabolic disease. KEY MESSAGES: • Alpha-1 antitrypsin (AAT) acts as an immune modulator to improve the efficacy of hepatocyte transplantation. • Treatment with AAT decreased thrombus formation and pro-inflammatory cytokine expression in a tubing loop model. • AAT significantly improved engraftment of donor hepatocytes within the first 48 h post transplantation. More... »

PAGES

563-577

References to SciGraph publications

  • 2009. Isolation of Human Hepatocytes in HEPATOCYTE TRANSPLANTATION
  • 2012-06. Expanding the Clinical Indications for α1-Antitrypsin Therapy in MOLECULAR MEDICINE
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00109-019-01747-3

    DOI

    http://dx.doi.org/10.1007/s00109-019-01747-3

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1112462566

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/30820592


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        "description": "For patients with non-cirrhotic liver-based metabolic disorders, hepatocyte transplantation can be an effective treatment. However, long-term function of transplanted hepatocytes following infusion has not been achieved due to insufficient numbers of hepatocytes reaching the liver cell plates caused by activation of the instant blood-mediated inflammatory reaction (IBMIR). Our aim was to determine if the natural immune modulator, alpha-1 antitrypsin (AAT), could improve engraftment of transplanted hepatocytes and investigate its mechanism of action. A tubing loop model was used to analyse activation of the IBMIR when human hepatocytes were in contact with ABO-matched blood and 4\u00a0mg/ml AAT. Platelet and white cell counts, complement and cytokine expression were analysed. To determine if AAT could improve short-term engraftment, female rats underwent tail vein injection of AAT (120\u00a0mg/kg) or water (control) prior to the intrasplenic transplantation of 2\u2009\u00d7\u2009107 male hepatocytes. At 48\u00a0h and 1\u00a0week, livers were collected for analysis. In our loop model, human hepatocytes elicited a significant drop in platelet count with thrombus formation compared to controls. Loops containing AAT and hepatocytes showed no platelet consumption and no thrombus formation. Further, AAT treatment resulted in reduced IL-1\u03b2, IL-6 and IFN-\u03b3 and increased IL-1RA compared to untreated loops. In vivo, AAT significantly improved engraftment of rat hepatocytes compared to untreated at 48\u00a0h. AAT infusion may inhibit the IBMIR, thus improving short-term engraftment of donor hepatocytes and potentially improve the outcomes for patients with liver-based metabolic disease. KEY MESSAGES: \u2022 Alpha-1 antitrypsin (AAT) acts as an immune modulator to improve the efficacy of hepatocyte transplantation. \u2022 Treatment with AAT decreased thrombus formation and pro-inflammatory cytokine expression in a tubing loop model. \u2022 AAT significantly improved engraftment of donor hepatocytes within the first 48\u00a0h post transplantation.", 
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