Publications by authors named "Jean Michel Dubernard"

Lymphodepletive agents play important role in different clinical applications or experimental transplant studies. In order to facilitate preclinical pediatric transplant studies, we have developed the rabbit anti-pig thymocyte globulin (pATG) and studied its effects in neonatal swines. In vitro assays showed that pATG can bind to lymphocytes and neutrophils in a dose-dependent manner and lyse peripheral blood mononuclear cells by apoptosis and complement-dependent cytotoxicity.

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The possibility to imagine a vascularized composite allotransplantation for disfigured children is felt more critical than for adults non on technical point of view but in terms of indications and justifications. The question is not about surgery. It is related to the pathologies themselves for which transplant could be suitable.

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Vascularized composite tissue allografts (VCA) have become a viable option to restore severely damaged parts of the body that cannot be repaired with conventional surgical techniques. Acute rejection develops frequently in the early postgraft period both in human and experimental VCA, but the possibility of human VCA to undergo chronic rejection (CR) remained initially unknown. The experience gained over the years shows that, similar to solid organ transplants (SOT), human VCA can also develop CR.

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Although several tolerance induction protocols have been successfully implemented in adult renal transplantation, no tolerance induction approach has, as yet, been defined for solid organ transplantations in young infants. Pediatric transplant recipients have a pressing demand for the elaboration of tolerance induction regimens. Indeed, since they display a longer survival time, they are exposed to a higher level of risks linked to long-term immunosuppression (IS) and to chronic rejection.

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Recipients of solid organ transplants (RSOT) have a highly increased risk for developing cutaneous premalignant and malignant lesions, favored by the lifelong immunosuppression. Vascularized composite tissue allografts (VCA) have been introduced recently, and relevant data are sparse. Two patients with skin cancers (one with basal cell carcinoma and one with squamous cell carcinomas) have been so far reported in this patient group.

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Between January 2000 and July 2009, five adults who had suffered bilateral traumatic below-elbow amputations, received bilateral hand-forearm allografts performed by the Lyon team. We report the functional benefits achieved over a mean follow-up period of 7.6 years (range 4-13 years), up to December 31st, 2013.

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Article Synopsis
  • The study aims to find the best dosage of oral cyclosporine A (CsA) for newborn swine used in transplantation research and examine its pharmacokinetics and short-term effects on kidneys.
  • Thirteen neonatal pigs were divided into four groups: one control and three receiving CsA at different doses (4, 8, and 12 mg/kg/day) for 15 days, with blood samples analyzed for CsA levels and kidney function markers.
  • Results showed that CsA was well-tolerated with no severe adverse effects; a dosage of 4 mg/kg/day is suggested for stable blood concentrations, which is much lower than needed for adult pigs.
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Clinical evidence available for the assessment of medical devices (MDs) is frequently insufficient. New MDs should be subjected to high quality clinical studies to demonstrate their benefit to patients. The randomized controlled trial (RCT) is the study design reaching the highest level of evidence in order to demonstrate the efficacy of a new MD.

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Article Synopsis
  • The study evaluated 5 cases of bilateral hand allotransplantation with follow-up periods of 3 to 13 years, focusing on outcomes and risk/benefit balance.
  • All patients experienced 100% survival rates for both the recipients and the transplanted hands, showing good sensorimotor recovery and the ability to perform daily activities.
  • The findings highlight that while bilateral hand transplantation can be a viable option for amputees, careful candidate selection and post-transplant monitoring are essential for success.
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Composite tissue allografts (CTA) are also called "reconstructive transplantation" as they are a valid alternative approach to repairing complex tissue defects. These procedures are still considered "experimental" and their therapeutic value remains to be validated. An immunosuppressive treatment similar to that used in solid organ transplantation allows CTA survival and function despite a high rate of acute rejection (AR) episodes.

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[The kidney].

Bull Acad Natl Med

October 2011

Whole-organ engineering of the kidney is particularly difficult because of its structural complexity and of the morphological and functional heterogeneity of renal cell types. As for other organs, research is currently focused on:--the matrix to support recellularization: synthetic, biodegradable or biological. Use of the extracellular matrix as a biological scaffold is the most promising approach.

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Background: Management of congenital limb aplasia or facial malformations could be improved by composite tissue allotransplantation (CTA), a technique that has never been performed in newborns. For this, however, the induction of donor-specific tolerance would be mandatory, as long-term immunosuppression is not acceptable in this non-lifesaving procedure. Induction of tolerance has been shown to be possible in a newborn CTA rat model but has never been tested in large-animal models.

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Background: The first human facial allotransplantation, a 38-year-old woman, was performed on November 27, 2005. The aesthetic aspect and functional recovery and the risk-to-benefit ratio are evaluated 5 years later.

Materials And Methods: The facial transplantation included nose, chin, part of cheeks, and lips.

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The first hand transplantation was realized in Lyon and the results achieved in this case showed the feasibility of the surgical technique, the efficacy of the immunosuppressive protocol, the limited adverse effects and the importance of a patient's compliance and rehabilitation to ensure graft viability and functional recovery. Based on these findings and the positive results achieved in other single hand transplants realized around the world the authors performed also the first double hand transplantation, then followed by other four cases. The recipients received the same immunosuppressive treatment including tacrolimus, prednisone, mycophenolate mofetil and antithymocyte globulins for induction, nevertheless they showed some episodes of acute rejection episodes which reversed after a prompt treatment.

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The International Registry on Hand and Composite Tissue Transplantation includes hand and face allotransplantations: 39 patients who received 57 upper extremity transplantations (18 bilateral and 21 single transplantations--17 right and 4 left allografted hands); and 15 cases of partial or total face allotransplantation. The recipients of upper extremity allotransplantations are: 32 males and 7 females, median age 32 years. In 57.

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Background: The International Registry on Hand and Composite Tissue Transplantation was founded in May 2002, and the analysis of all cases with follow-up information up to July 2010 is presented here.

Methods: From September 1998 to July 2010, 49 hands (17 unilateral and 16 bilateral hand transplantations, including 1 case of bilateral arm transplantation) have been reported, for a total of 33 patients. They were 31 men and 2 women (median age 32 years).

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Epidermal Langerhans cells (LC) are dendritic, antigen-presenting cells residing within mammalian epidermis and mucosal epithelia. When massively depleted, they are replaced by cells of bone-marrow origin. However, their renewal within normal skin under steady-state conditions is not precisely known.

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Background: Since May 2002, all groups performing hand transplantations have supplied information to the International Registry on Hand and Composite Tissue Transplantation (IRHCCT). The analysis of all cases with follow-up information up to September 2007 is presented here.

Methods: From September 1998 to September 2007, 38 hands (18 unilateral and 10 bilateral hand transplantations) and two digits have been reported to IRHCTT, for a total of 30 patients with a follow-up period ranging from 6 months to 9 years.

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The impact of portal or systemic venous pancreas graft drainage on patient and graft outcome remains controversial. In the present study, the impact of venous drainage type on long-term patient and graft survival is assessed. From July 1996 to December 2002 80 simultaneous pancreas-kidney transplants were enrolled into a prospective study: 44 received a pancreas allograft with portal (P-SPK group) and 36 with systemic venous drainage (S-SPK group).

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