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Resolution and relapse of osteopetrosis in mice transplanted with myeloid tissue of variable histocompatibility.

Osteopetrotic microphthalmic mice (mi/mi) were treated by injections of suspensions of myeloid tissue, newborns i.p., and weanlings i.v. Donated syngeneic material effected permanent cure of oteopetrosis provided that the dose was large enough (10(8) cells of bone marrow). H-2-compatible allogeneic bone marrow was initially as effective, but relapse ensued in immunocompetent mice. H-2-incompatible marrow was ineffecitve except in one set of newborn tolerant mice. Total body X-radiation in sublethal doses to recipients allowed permanent cure with H-2-compatible, and, in one circumstance, with H

[Development of hematopietic and lymphoid tissues in conjoint bone marrow and thymus transplants].

The model of heterotopic transplantation of the mixture of bone marrow and thymus fragments was used to study the interaction of hemopoietic and lymphoid tissues under their direct contact. The bone marrow and thymus fragments of adult mice F1 (CBAXXC57BL) were transplanted separately or in the mixture under the kidney capsule of mice of the same strain. During the whole period of observation (from 10 days up to 14 months), the development of bone marrow and thymus fragments in the joint transplants proceeded independently, no "mixed" stroma appeared, and the stroma of each organ ensured the d

Tissue perfusion pressure as a physiologic indicator of renal failure risk after heart transplantation.

BACKGROUND: Mean arterial pressure (MAP) guides hemodynamic management following heart transplantation, yet renal failure remains common. Tissue perfusion pressure (TPP), defined as MAP minus critical closing pressure, predicts acute kidney injury in non-transplant cardiac surgery. We hypothesized that postoperative TPP predicts continuous renal replacement (CRRT) requirement after heart transplantation. METHODS: We analyzed all adult heart transplants at a single institution (01/2020-06/2025) and excluded multiorgan transplants, congenital heart disease, and patients requiring post-transplan

The feasibility of ovarian tissue cryopreservation in selected females after hematopoietic stem cell transplantation.

We evaluated whether ovarian tissue cryopreservation (OTC) is a viable option for girls and young women who have already undergone hematopoietic stem cell transplantation (HSCT). We enrolled 142 patients who underwent OTC either before or after HSCT. Participants were categorized into three groups: "after HSCT group" (n = 16), "no-chemo group" before OTC (n = 75), and "chemo group" before OTC (n = 51). The after HSCT cohort had a mean age of 12.06 years at OTC, with half being pre-pubertal. Comparative analysis across age (0-12 and 13-24 years) revealed that the after-HSCT group consistently p

Impact of Liver Transplantation on Adipose Tissue Compartments and Its Association With Metabolic Sequela.

BACKGROUND: Loss of skeletal muscle can be accompanied by an increase in adipose tissue leading to sarcopenic obesity. There are limited data on how liver transplantation (LT) might impact adipose tissue compartments, particularly among patients with metabolically active disease, such as nonalcoholic steatohepatitis (NASH) and subsequent metabolic sequela. METHODS: Skeletal muscle, visceral adipose tissue (VAT), and subcutaneous adipose tissue (SAT) were measured using cross-sectional imaging performed in 190 patients pre-LT, 6 mo post-LT and 12 mo post-LT. Changes in adipose tissue and their

Role of Stem Cells in the Ovarian Tissue Cryopreservation and Transplantation for Fertility Preservation.

Although the cancer survival rate has increased, cancer treatments, including chemotherapy and radiotherapy, can cause ovarian failure and infertility in women of reproductive age. Preserving fertility throughout cancer treatment is critical for maintaining quality of life. Fertility experts should propose individualized fertility preservation methods based on the patient's marital status, pubertal status, partner status, and the urgency of treatment. Widely practiced fertility preservation methods, including ovarian transposition and embryo and oocyte cryopreservation, are inappropriate for p

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… Ischemic follicle loss occurs after ovarian tissue transplantation. To improve the success rate, the use of stem cells to prevent follicle loss has been investigated, and its efficacy is promising. … These experiments show the effect of stem cells in ovary tissue transplantation by means of angiogenesis, follicle maturation, oxygenation, and anti-apoptosis. …

Cryopreservation and Transplantation of Laboratory Rodent Ovarian Tissue for Genome Banking and Biomedical Research.

Genetic modifications in combination with highly sophisticated assisted reproductive technologies such as in vitro oocyte maturation and development, in vitro fertilization, intracytoplasmic sperm injection, and in vitro embryo culture have opened many research avenues and treatment options for both animals and humans. The number of genetically modified (GM) rodent strains increased considerably during the last several decades, and their numbers are expected to increase due to efficient gene editing technologies including the CRISPR/Cas9. Rodent ovarian tissues (OT) cryopreservation and transp

Future Prospects for Human Tissue Engineered Urethra Transplantation: Decellularization and Recellularization-Based Urethra Regeneration.

To evaluate the histological characteristics of decellularized human urethra after transplantation into the rat omentum and compare in vivo cell seeding with perfusion-based and cell sheet urethral regeneration. Eight adult human male urethras accompanied with the surrounding corpus spongiosum were obtained. The tissues were decellularized with detergent-based method. The efficacy of decellularization and extracellular matrix preservation was evaluated by several techniques. Decellularized scaffolds were transplanted into the omentum of 12 male rats and located into the scrotum. Biopsies were

Ex Vivo Model of Human Penile Transplantation and Rejection: Implications for Erectile Tissue Physiology.

BACKGROUND: Penile transplantation is a potential treatment option for severe penile tissue loss. Models of human penile rejection are lacking. OBJECTIVE: Evaluate effects of rejection and immunosuppression on cavernous tissue using a novel ex vivo mixed lymphocyte reaction (MLR) model. DESIGN, SETTING, AND PARTICIPANTS: Cavernous tissue and peripheral blood mononuclear cells (PBMCs) from 10 patients undergoing penile prosthesis operations and PBMCs from a healthy volunteer were obtained. Ex vivo MLRs were prepared by culturing cavernous tissue for 48h in media alone, in media with autologou

[Repair of the finger proximal and middle segment soft tissue defect with flap transplantation].

OBJECTIVE: To summarize and analyze the surgical methods and therapeutic effects of repair of the finger proximal and middle segment soft tissue defect with three different types of skin flaps. METHODS: From May 2011 to May 2015, 102 patients with 115 fingers proximal and middle segment soft tissue defect underwent reconstruction with three different types of skin flaps. There were 59 males with 70 fingers and 43 females with 45 fingers, aged from 19 to 62 years old with an average of 45.6 years. Twenty-nine patients with 29 fingers were repaired by free peroneal artery perforator flaps, 35 p

Role of tissue expanders in patients with loss of abdominal domain awaiting intestinal transplantation.

Abdominal closure is a complex surgical problem in intestinal transplant recipients with loss of abdominal domain, as graft exposure results in profound morbidity. Although intraoperative coverage techniques have been described, this is the first report of preoperative abdominal wall augmentation using tissue expanders in patients awaiting intestinal transplantation. We report on five patients who received a total of twelve tissue expanders as a means to increase abdominal surface area. Each patient had a compromised abdominal wall (multiple prior operations, enterocutaneous fistulae, subcutan

Transplantation of tissue-engineered human corneal epithelium in limbal stem cell deficiency rabbit models.

AIM: To evaluate the biological functions of tissue-engineered human corneal epithelium (TE-HCEP) by corneal transplantation in limbal stem cell deficiency (LSCD) rabbit models. METHODS: TE-HCEPs were reconstructed with DiI-labeled untransfected HCEP cells and denuded amniotic membrane (dAM) in air-liquid interface culture, and their morphology and structure were characterized by hematoxylin-eosin (HE) staining of paraffin-sections, immunohistochemistry and electron microscopy. LSCD models were established by mechanical and alcohol treatment of the left eyes of New Zealand white rabbits, and

Use of tissue plasminogen activator in liver transplantation from donation after cardiac death donors.

Ischemic-type biliary stricture (ITBS) occurs in up to 50% after liver transplantation (LT) from donation after cardiac death (DCD) donors. Thrombus formation in the peribiliary microcirculation is a postulated mechanism. The aim was to describe our experience of tissue plasminogen activator (TPA) administration in DCD-LT. TPA was injected into the donor hepatic artery on the backtable (n = 22). Two recipients developed ITBS including one graft failure. Although excessive postreperfusion bleeding was seen in 14 recipients, the amount of TPA was comparable between those with and without excessi

Mechanisms of tolerance to parental parathyroid tissue when combined with human allogeneic thymus transplantation.

BACKGROUND: The induction of tolerance toward third-party solid organ grafts with allogeneic thymus tissue transplantation has not been previously demonstrated in human subjects. OBJECTIVE: Infants with complete DiGeorge anomaly (having neither thymus nor parathyroid function) were studied for conditions and mechanisms required for the development of tolerance to third-party solid organ tissues. METHODS: Four infants who met the criteria received parental parathyroid with allogeneic thymus transplantation and were studied. RESULTS: Two of 3 survivors showed function of both grafts but subse…

The role of intrapulmonary de novo lymphoid tissue in obliterative bronchiolitis after lung transplantation.

Chronic rejection after lung transplantation is manifested as obliterative bronchiolitis (OB). The development of de novo lymphoid tissue (lymphoid neogenesis) may contribute to local immune responses in small airways. Compared with normal lungs, the lung tissue of 13 lung transplant recipients who developed OB demonstrated a significantly larger number of small, airway-associated, peripheral node addressin-positive (PNAd(+)) high endothelial venules (HEVs) unique to lymphoid tissue (p < 0.001). HEVs were most abundant in lesions of lymphocytic bronchiolitis and "active" OB infiltrated by lymp

Ocular surface restoration using non-surgical transplantation of tissue-cultured human amniotic epithelial cells.

PURPOSE: To assess the effect of tissue-cultured human amniotic epithelial cells (AECs) in restoring the ocular surface, transplanted using a collagen shield seeded with AECs supported by a soft contact lens. DESIGN: Prospective interventional single-institutional case series with crossover controls. METHODS: Three eyes in three patients were identified with persistent corneal epithelial defects (PEDs) refractory to medical therapy. Two cases were secondary to neurotrophic keratopathy, while one case was attributable to longstanding alkali injury. AECs were isolated from serologically screen

[The use of cyanoacrylate tissue adhesive in the pterygium excisions with amniotic membrane transplantation].

PURPOSE: To find the proper way to use the cyanoacrylate tissue adhesive (CTA) in the pterygium excisions with amniotic membrane transplantation and To evaluate the therapeutic effects of it. METHOD: A prospective randomized clinical trial was carried out in 27 patients (32 eyes) who would have pterygium excision. They were divided into 2 groups randomly: 15 eyes in the CTA group, 17 eyes in the suture group. We evaluate the benefits of them with the respect to surgery time and postoperative sighs and symptoms. RESULTS: Average surgery time was 15.8 minutes for CTA group and 23.7 minutes for

Human pancreatic duct cells exert tissue factor-dependent procoagulant activity: relevance to islet transplantation.

Activation of the coagulation cascade contributes to early graft loss and intraportal thrombotic events in clinical islet transplantation. Although these complications were shown to be related to the presence of tissue factor in human islet preparations, the contribution of duct cells, which represent a major contaminant of clinical islet isolates, has not been specified so far. Herein, we used flow cytometry, immunohistochemistry, RT-PCR, and functional coagulation assays to demonstrate that duct cells exert a potent factor VII-dependent procoagulant activity related to their expression of ti

Novel strategy for soft tissue augmentation based on transplantation of fragmented omentum and preadipocytes.

Current therapeutic procedures for soft tissue augmentation still lack the ability to induce rapidly formation of adipose tissue and its long-term stability, which is determined by rapid revascularization. The omentum is highly vascularized with microvascular endothelial cells (ECs) and is composed mainly of adipocytes that produce an enormously high level of vascular endothelial growth factor (VEGF). The aim of this study was to determine the potential usefulness of fragmented omentum tissues, with or without cotransplantation with preadipocytes, in soft tissue augmentation. Fragmented omentu

Melatonin-secreting pineal gland: a novel tissue source for neural transplantation therapy in stroke.

Chronic systemic melatonin treatment attenuates abnormalities produced by occlusion of middle cerebral artery (MCA) in adult rats. Because the pineal gland secretes high levels of melatonin, we examined in the present study whether transplantation of pineal gland exerted similar protective effects in MCA-occluded adult rats. Animals underwent same-day MCA occlusion and either intrastriatal transplantation of pineal gland (harvested from 2-month-old rats) or vehicle infusion. Behavioral tests (from day of surgery to 3 days posttransplantation) revealed that transplanted stroke rats displayed si