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21. Chirurgischen Forschungstage
In: Meetings |Presentations written by: Prof. Dr. Igor M. Sauer
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The 21. Chirurgische Forschungstage took place in Cologne. Five of our students gave terrific presentations: S. Moosburner gave an oral presentation on „Steatotic Liver Transplantation – a Growing Problem with Severe Complications“, H. Everwien on „Different biological scaffolds as a platform for engineering an endocrine Neo-Pancreas by using decellularization and recellularization techniques“, M. Noesser on „A comprehensive description of the development of a stable closed circuit for ex vivo rat liver machine perfusion“, R. Horner on „Is Percoll purifcation necessary for isolation of primary human hepatocytes?“, and N. Seiffert on „Recellularization of Decellularized Bovine Carotid Arteries using Human Endothelial Progenitor Cells: One Step towards an Autologous Bypass Graft“.
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Tags: Decellularization,Recellularization,Steatosis Hepatis,Liver Transplantation,Organ Perfusion

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Our manuscript "Depletion of donor dendritic cells ameliorates immunogenicity of both skin and hind limb transplants" has been accepted for publication in Frontiers in Immunology, section Alloimmunity and Transplantation. Authors are Muhammad Imtiaz Ashraf, Joerg Mengwasser, Anja Reutzel-Selke, Dietrich Polenz, Kirsten Führer, Steffen Lippert, Peter Tang, Edward Michaelis, Rusan Catar, Johann Pratschke, Christian Witzel, Igor M. Sauer, Stefan G. Tullius, and Barbara Kern.

Acute cellular rejection remains a significant obstacle affecting successful outcomes of organ transplantation including vascularized composite tissue allografts (VCA). Donor antigen presenting cells (APC), particularly dendritic cells (DC), orchestrate early alloimmune responses by activating recipient effector T cells. Employing a targeted approach, we investigated the impact of donor-derived conventional DC (cDC) and APC on the immunogenicity of skin and skin-containing VCA grafts, using mouse models of skin and hind limb transplantation.
By post-transplantation day 6, skin grafts demonstrated severe rejections, characterized by predominance of recipient CD4 T cells. In contrast, hind limb grafts showed moderate rejection, primarily infiltrated by CD8 T cells. While donor depletion of cDC and APC reduced frequencies, maturation, and activation of DC in all analysed tissues of skin transplant recipients, reduction in DC activities was only observed in the spleen of hind limb recipients. Donor cDC and APC depletion did not impact all lymphocyte compartments but significantly affected CD8 T cells and activated CD4 T in lymph nodes of skin recipients. Moreover, both donor APC and cDC depletion attenuated the Th17 immune response, evident by significantly reduced Th17 (CD4+IL-17+) cells in the spleen of skin recipients and reduced levels of IL-17E and lymphotoxin-α in the serum samples of both skin and hind limb recipients. In conclusion, our findings underscore the highly immunogenic nature of skin component in VCA. The depletion of donor APC and cDC mitigates the immunogenicity of skin grafts while exerting minimal impact on VCA.

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