Reconstitution of hematopoiesis following intrauterine transplantation of stem cells.
ABSTRACT In utero hematopoietic stem cell transplantation is an entirely nonmyeloablative approach to achieve mixed hematopoietic chimerism and associated donor-specific tolerance. This chapter provides the rationale and methodologic detail for the administration of stem cells to the "preimmune" mouse fetus by a variety of routes. The development of murine model systems for in utero transplantation has accelerated progress in the field of in utero hematopoietic stem cell transplantation. Creative use of these models should also have experimental application to the fields of fetal gene therapy, stem cell biology, and developmental biology.
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ABSTRACT: It is important to recognize that it is only during our lifetime, the last decades of the 20th century, that the fetus has become a patient, with much of the credit due to the powerful imaging and sampling techniques now available. The secret life of the fetus has been revealed and with it the details of normal fetal growth and development and the opportunity to identify, detect, and treat fetal anomalies surgically. From a nursing perspective, this article provides a historical overview of fetal treatment, including the development and evolution of fetal surgery, a description of some milestones of this multifaceted, complex area, a delineation of the components and dynamics of collaborative team management of fetal therapy patients, and finally an introduction to introduce emerging trends that will affect the future of this rapidly evolving field.The Journal of perinatal & neonatal nursing 01/2007; 21(1):11-9; quiz 20-1. · 1.01 Impact Factor
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ABSTRACT: The competence of the immune system of the developing fetus to act as a barrier to in utero hematopoietic-cell transplantation (IUHCT) has been a source of debate. Until now, comparisons of allogeneic and congenic engraftment have been inconclusive due to methodologic limitations resulting in minimal and inefficient engraftment. In this study, E14 fetal mice received transplants of either allogeneic or congenic bone marrow using a new intravascular technique that allows definitive administration of much higher doses of donor cells. Our results demonstrate that 100% of surviving recipients demonstrate engraftment at 1 week of age, but that 70% of allogeneic recipients lose engraftment by 1 month of age, and 80% ultimately fail to sustain long-term chimerism. In contrast, all congenic recipients maintain stable, long-term, multilineage chimerism. These results strongly support an immune barrier to allogeneic engraftment after IUHCT.Blood 03/2007; 109(3):1331-3. DOI:10.1182/blood-2006-04-018606 · 10.43 Impact Factor
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ABSTRACT: Recent studies have shown that skin injury recruits bone marrow-derived fibroblasts (BMDFs) to the site of injury to accelerate tissue repair. However, whether uninjured skin can recruit BMDFs to maintain skin homeostasis remains uncertain. Here, we investigated the appearance of BMDFs in normal mouse skin after embryonic bone marrow cell transplantation (E-BMT) with green fluorescent protein-transgenic bone marrow cells (GFP-BMCs) via the vitelline vein, which traverses the uterine wall and is connected to the fetal circulation. At 12 weeks of age, mice treated with E-BMT were observed to have successful engraftment of GFP-BMCs in hematopoietic tissues accompanied by induction of immune tolerance against GFP. We then investigated BMDFs in the skin of the same mice without prior injury and found that a significant number of BMDFs, which generate matrix proteins both in vitro and in vivo, were recruited and maintained after birth. Next, we performed E-BMT in a dystrophic epidermolysis bullosa mouse model (col7a1(-/-)) lacking type VII collagen in the cutaneous basement membrane zone. E-BMT significantly ameliorated the severity of the dystrophic epidermolysis bullosa phenotype in neonatal mice. Type VII collagen was deposited primarily in the follicular basement membrane zone in the vicinity of the BMDFs. Thus, gene therapy using E-BMT into the fetal circulation may offer a potential treatment option to ameliorate genetic skin diseases that are characterized by fibroblast dysfunction through the introduction of immune-tolerated BMDFs.American Journal Of Pathology 10/2008; 173(3):803-14. DOI:10.2353/ajpath.2008.070977 · 4.60 Impact Factor