Penile Transplantation The Science of Rejection and Erection
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1 Penile Transplantation The Science of Rejection and Erection Nikolai Sopko, MD, PhD Bivalacqua Laboratory The James Buchanan Brady Urological Institute
2 Background Penile transplantation has been successfully used in two cases to treat penile tissue loss It is unknown how the different tissues comprising the penis will undergo tissue rejection It is unknown how rejection and immunosuppression therapy will affect tissue function For vascularized composite allotransplant (VCA) grafts, skin can commonly be surveilled to monitor tissue rejection (Banff Classification) Transplantation Intl Schneider et al.
3 Background Penile Transplant Models Lack of animal models Four reports using rats, all heterotopic transplants, one report using Beagles, which was an orthotopic transplant. Rat models have used either omental wraps or anastomosed branches of the femoral artery with the corpus spongiosum to retrograde perfuse the transplanted graft. Technically challenging anastomoses and precludes the ability to evaluate urethral tissues or erectile function. Canine study evaluated 10 orthotopic penile transplantations in half-brother Beagles treated with immunosuppression. Animals were able to spontaneously void after 10 days and there were no signs of acute rejection when tissues were collected at 14 days post-operatively. Erectile function was not assessed.
4 Goals To develop better models of penile transplantation and rejection To use those models to better understand how the tissues of penis reject and how rejection and immunosuppression affect tissue function
5 Rat Heterotopic Allotransplantation Model 2009 APS Sonmez et al.
6 Grafts rejected by POD 7 POD 1 POD 3 POD 7
7 Leukocyte infiltration of the urethra and nervous tissue H&E Wright-Giemsa Stain Urethra Skin
8 Apoptosis of urethral tissues TUNEL Staining DAPI TUNEL 24 Hour Post-Transplant 72 Hour Post-Transplant
9 Rodent model conclusions Difference in rejection rates between tissue types Time consuming and technically challenging Need for an easier, high volume model
10 Mixed Lymphocyte Reaction (MLR) Established 30 years ago to study immune cell activation and screen compatibility between donor and recipients for solid organ transplantation. In vitro experiment performed by mixing peripheral blood mononuclear cells (PBMCs) of the donor with PBMCs of the recipient. Measure cell proliferation, cytokine production, subpopulations, etc as markers of activation Tissue Antigens Lindemann et al.
11 Ex-vivo Organotypic Mixed Lymphocyte Reaction Control Autograft Allograft Allograft + Immunosuppresion
12 Real-Time Flourescent Imaging SNARF Activated Caspase-3/7 Labeled PBMCs Merge
13 Ex-vivo MLR allotransplant has increased apoptosis Autotransplant Allotransplant Day 1 Day 7 Day 1 Day 7
14 Tacrolimus reduces tissue apoptosis in ex-vivo MLR
15 Ex-vivo MLR allograft immune cell activation 7 Days
16 Penile tissue components have different immunogenicity
17 Human urethra also undergoes rejection
18 Human ex-vivo MLR to test erectile function
19 Ex-Vivo MLR validation of the model (A) Media (B) Auto (C) Allo (D) Allo+CsA *
20 Ex-Vivo MLR validation of the model
21 Rejection impairs erectile physiology EFS Electrical Field Stimulation
22 Rejection affects tissue morphology and is prevented by CsA Immunosuppression
23 Rejection affects tissue morphology and is prevented by CsA Immunosuppression
24 Although it prevents rejection, cyclosporine A also impairs erectile physiology EFS Electrical Field Stimulation
25 FK506 does not impair erectile physiology 2016 EurUrol Sopko et al.
26 Conclusions Penile rejection in the setting of transplantation is complex many different tissue types, which have different immunogenicity Animal models are very limited given anatomical correlation, size, and ethical concerns using large animals Ex-vivo MLR can be used to model penile tissue rejection including sub-tissue types Tissue rejection and CsA treatment impairs erectile physiology FK506 may be more suitable for immunosuppression
27 Acknowledgements Bivalacqua Laboratory Plastic Surgery Trinity Bivalacqua, MD, PhD Denver Lough, MD, PhD Plastics Brady Devin Miller Max Kates, MD Hotaka Matsui, MD Xiaopu Liu, BS Takahiro Yoshida, MD, PhD Arthur Burnett, MD Kevin Billups, MD
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