Abstract:
:The formation of a new microvasculature is essential for the long-term survival and function of the islet graft. In this study we examined endothelium of isolated pancreatic islets by stimulation with growth factors, different culture conditions, and genetic modification. We also inspected the effect of immunosuppressives used in human transplantation on angiogenesis. Isolated islets were embedded in a three-dimensional fibrin or Matrigel matrix. The effect of hyperglycemia, hypoxia, and the addition of VEGF and bFGF was investigated. We exposed islets from transgenic mice expressing the VEGF gene (RIP1VEGF-A) to high glucose (16.7 mmol/L) medium and tested the immunosuppressive agents rapamycin (100 ng/ml) and FK506 (100 ng/ml). To quantify angiogenesis the percentage of sprouting islets was determined. New endothelial capillary-like structures protruded from isolated pancreatic islets. Addition of VEGF to the islets and transgenic RIP-VEGF islets showed a two- to threefold increase of sprouting islets compared to control. Hypoxic culture conditions stimulated angiogenesis, resulting in a twofold increase of capillary sprouting. Rapamycin and FK506 proved to be potent inhibitors of angiogenesis in this system, because a decrease of sprouting islets of more than 20% by both agents was observed. Isolated pancreatic islets are capable of forming new capillary structures and are susceptible to pro- and antiangiogenic stimuli.
journal_name
Cell Transplantjournal_title
Cell transplantationauthors
Kidszun A,Schneider D,Erb D,Hertl G,Schmidt V,Eckhard M,Preissner KT,Breier G,Bretzel RG,Linn Tdoi
10.3727/000000006783981774subject
Has Abstractpub_date
2006-01-01 00:00:00pages
489-97issue
6eissn
0963-6897issn
1555-3892journal_volume
15pub_type
杂志文章abstract::Ex vivo embryonic liver explant culture is a novel and attractive approach to obtain abundant hepatic and hematopoietic stem cells. Gene therapy of autologous hepatic and hematopoietic stem cells represents an alternative therapeutic approach to liver transplantation for genetic and metabolic disorders. In this study ...
journal_title:Cell transplantation
pub_type: 杂志文章
doi:10.3727/000000001783986945
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abstract::This invited concise review was written for the special issue of Cell Transplantation to celebrate the 25th anniversary of the American Society for Neural Therapy and Repair (ASNTR). I aimed to present a succinct summary of two interweaved lines of research work carried out by my team members and collaborators over th...
journal_title:Cell transplantation
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abstract::Heart failure continues to be a major health care concern with relatively few options for severely advanced heart failure patients. The hallmark of heart failure is the progressive dilatation of the left ventricle, thinning of the left ventricular wall leading to increased wall stress and increased myocardial oxygen c...
journal_title:Cell transplantation
pub_type: 临床试验,杂志文章
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abstract::Adipose tissue contains a mesenchymal stem cell (MSC) population known as adipose-derived stem cells (ASCs) capable of differentiating into different cell types. Our aim was to induce hepatic transdifferentiation of ASCs by sequential exposure to several combinations of cytokines, growth factors, and hormones. The mos...
journal_title:Cell transplantation
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abstract::The need for chronic immune suppression (IS) is one of the hurdles precluding widespread use of islet cell transplantation to restore glycemic control in patients with type 1 diabetes. We report the case of a healthy nonhuman primate (NHP) treated on and off for over 2.5 years with steroid-free IS, consisting of dacli...
journal_title:Cell transplantation
pub_type: 杂志文章
doi:10.1177/0963689718823505
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abstract::Cord blood is an attractive cell source in regenerative medicine and represents an alternative to bone marrow. The aim of this study was to investigate whether human umbilical cord blood mononuclear (HUCBM) cells might be valuable in hepatic regenerative medicine. HUCBM cells differentiated in vitro into hepatocytes, ...
journal_title:Cell transplantation
pub_type: 杂志文章
doi:10.3727/096368908786516837
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journal_title:Cell transplantation
pub_type: 杂志文章
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journal_title:Cell transplantation
pub_type: 杂志文章
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abstract::Cellular transplantation strategies utilizing intraspinal or intrathecal olfactory ensheathing cells (OECs) have been reported as beneficial for spinal cord injury (SCI). However, there are many disadvantages of these methods, including additional trauma to the spinal cord parenchyma and technical challenges. Therefor...
journal_title:Cell transplantation
pub_type: 杂志文章
doi:10.1177/0963689719883842
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journal_title:Cell transplantation
pub_type: 杂志文章
doi:10.3727/000000006783981954
更新日期:2006-01-01 00:00:00
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journal_title:Cell transplantation
pub_type: 杂志文章
doi:10.1177/096368979900800308
更新日期:1999-05-01 00:00:00
abstract::The main purpose of this work has been to establish a new culturing technique to improve the chondrogenic commitment of isolated adult human chondrocytes, with the aim of being used during cell-based therapies or tissue engineering strategies. By using a rather novel technique to generate scaffold-free three-dimension...
journal_title:Cell transplantation
pub_type: 杂志文章
doi:10.3727/096368908786576499
更新日期:2008-01-01 00:00:00
abstract::Nerve growth factor (NGF) exerts both trophic (cell survival) and tropic (axonal growth-promoting) effects on several neuronal populations. In particular, its robust ability to prevent lesion-induced and spontaneous age-related basal forebrain cholinergic neuronal degeneration, and to promote mnemonic recovery, has su...
journal_title:Cell transplantation
pub_type: 杂志文章
doi:10.1177/096368970000900508
更新日期:2000-09-01 00:00:00
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journal_title:Cell transplantation
pub_type: 杂志文章
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journal_title:Cell transplantation
pub_type: 杂志文章
doi:10.1016/s0963-6897(97)00113-9
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abstract::To examine the effects of autologous sural nerve and adrenal medullary tissue intrastriatal cografts upon voluntary motor performance in parkinsonism, a non-human primate 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) model was employed to quantitatively assess skilled hand movements. Motor performance was studie...
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doi:10.1016/0963-6897(95)92155-r
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pub_type: 杂志文章,随机对照试验
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pub_type: 杂志文章
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abstract::Acute myocardial infarction (AMI) results in ischemic damage and death of cardiomyocytes and loss of vasculature. Stem cell therapy has emerged as a potentially promising strategy for maximizing cardiac function following ischemic injury. Issues of cell source, delivery, and quantification of response have challenged...
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abstract::The periodontal ligament displays a reservoir of mesenchymal stem cells which can account for periodontal regeneration. Despite the numerous studies directed at the definition of optimal culture conditions for long-term expansion of periodontal ligament stem cells (PDLSCs), no consensus has been reached as to what is ...
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abstract::New treatment paradigms that slow or reverse progression of chronic kidney disease (CKD) are needed to relieve significant patient and healthcare burdens. We have shown that a population of selected renal cells (SRCs) stabilized disease progression in a mass reduction model of CKD. Here, we further define the cellular...
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