Detection of major histocompatibility complex molecules in processed allogeneic bone blocks for use in alveolar ridge reconstruction

Tobias Fretwurst; Lames M Gad; Thorsten Steinberg; Hagen Schmal; Robert Zeiser; Anna-K Amler; Katja Nelson; Brigitte Altmann

doi:10.1016/j.oooo.2018.01.018

Detection of major histocompatibility complex molecules in processed allogeneic bone blocks for use in alveolar ridge reconstruction

Oral Surg Oral Med Oral Pathol Oral Radiol. 2018 Mar 20:S2212-4403(18)30054-3. doi: 10.1016/j.oooo.2018.01.018. Online ahead of print.

Authors

Tobias Fretwurst¹, Lames M Gad², Thorsten Steinberg³, Hagen Schmal⁴, Robert Zeiser⁵, Anna-K Amler², Katja Nelson², Brigitte Altmann²

Affiliations

¹ Department of Oral and Craniomaxillofacial Surgery, Medical Center, University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany. Electronic address: [email protected].
² Department of Oral and Craniomaxillofacial Surgery, Medical Center, University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
³ Department of Oral Biotechnology, Medical Center, University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; Faculty of Biology, University of Freiburg, Freiburg, Germany.
⁴ Department of Orthopedics and Traumatology, Odense University Hospital and Department of Clinical Research, University of Southern Denmark, Odense M, Denmark.
⁵ Department of Hematology, Oncology and Stem Cell Transplantation, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.

PMID: 29571656
DOI: 10.1016/j.oooo.2018.01.018

Abstract

Objectives: Because processed allogenic bone blocks contain remnants of cells and other organic material, the present study examined the putative presence of major histocompatibility complex (MHC) molecules in protein extracts derived from processed allogeneic bone blocks.

Study design: Protein content and the immunogenic potential of 3 different processed allografts (Osteograft, DIZG, Berlin, Germany; Caput femoris, DIZG, Berlin, Germany; Human Spongiosa, Charité Tissue Bank, Berlin, Germany) were assessed by protein extraction and analysis of the presence of MHC class 1 and 2 molecules prior to grafting. MHC concentration was measured by using enzyme-linked immunosorbent assay.

Results: Protein content in the allograft materials varied between 0.87 and 1.61 µg protein/mg. In the allograft Human Spongiosa, no MHC was detected, whereas in the allogeneic bone blocks Osteograft and Caput femoris MHC 1 (0.04-0.037 ng/mg graft material) and in Osteograft MHC class 2 molecules were detectable.

Conclusions: The results of the present study suggest that despite thorough processing, a potential antigenicity of allografts is not eliminated. MHC molecules in allografts may sensitize the immune system.