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3D CELL BIOPRINTING FOR REGENERATIVE MEDICINE RESEARCH AND THERAPIES 用于再生医学研究和治疗的3d细胞生物打印
Pub Date : 2012-12-01 DOI: 10.1142/S1568558611000301
C. Khatiwala, R. Law, B. Shepherd, S. Dorfman, M. Csete
Tissue engineering tools and technologies are critical for regenerative medicine and the translational research supporting development of cell-based therapies. 3D cell bioprinting is a relatively new engineering tool being used to design 3D cell constructs (rather than cell suspensions) for transplantation therapies. In this review, we describe a broad range of printing technologies now being used to deliver cells and biomaterials in preclinical studies. We focus on 3D cell bioprinting, in which the building blocks (or 'bioink') used in printing process are three-dimensional cell structures, that are placed by the bioprinter into precise architectures to generate small tissues or organs. 3D cell bioprinting is a flexible research tool for basic and translational stem cell biology.
组织工程工具和技术对于再生医学和支持细胞疗法发展的转化研究至关重要。3D细胞生物打印是一种相对较新的工程工具,用于设计用于移植治疗的3D细胞结构(而不是细胞悬液)。在这篇综述中,我们描述了目前在临床前研究中用于传递细胞和生物材料的广泛的打印技术。我们专注于3D细胞生物打印,其中打印过程中使用的构建块(或“生物墨水”)是三维细胞结构,由生物打印机放置到精确的结构中以生成小组织或器官。3D细胞生物打印是基础和转化干细胞生物学的一种灵活的研究工具。
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引用次数: 62
NUCLEAR REPROGRAMMING AND THE CURRENT CHALLENGES IN ADVANCING PERSONALIZED PLURIPOTENT STEM CELL-BASED THERAPIES 核重编程和当前在推进个性化多能干细胞治疗中的挑战
Pub Date : 2012-12-01 DOI: 10.1142/S1568558612300028
J. Byrne
John Gurdon's discovery that somatic cells could be reprogrammed back into a pluripotent state has immense implications across multiple different fields, including the future potential for autologous cellular therapies. This review briefly examines the history of nuclear reprogramming, from Gurdon's original work in amphibia, through the generation of oocyte-reprogrammed pluripotent stem cells in the non-human primate and recent defined factor-based reprogramming approaches to generate human induced pluripotent stem (iPS) cells. This review also examines the five principle challenges towards safely advancing pluripotent stem cell derivatives into personalized human therapeutics, specifically: genetic stability, epigenetic memory, post-transplantation efficacy, post-transplantation safety and feasibility, and additionally discusses various hypotheses that may play a role in resolving the aforementioned challenges. Focused on iPS cells and derivatives, these hypotheses essentially deal with aging research, ...
John Gurdon发现体细胞可以被重新编程回到多能状态,这一发现在多个不同的领域具有巨大的意义,包括未来自体细胞治疗的潜力。本文简要回顾了核重编程的历史,从Gurdon在两栖动物的原始工作,到在非人类灵长类动物中产生卵母细胞重编程的多能干细胞,以及最近定义的基于因子的重编程方法来产生人类诱导多能干细胞(iPS)。本综述还探讨了将多能干细胞衍生物安全推进到个性化人类治疗中的五个主要挑战,特别是:遗传稳定性、表观遗传记忆、移植后疗效、移植后安全性和可行性,并讨论了可能在解决上述挑战中发挥作用的各种假设。这些假设主要针对iPS细胞及其衍生物,主要涉及衰老研究……
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引用次数: 4
EDITORIAL — NOBEL PRIZE HIGHLIGHT: SOMATIC CELL REPROGRAMMING AND THE CURRENT CLINICAL GRADE CHALLENGE 社论-诺贝尔奖亮点:体细胞重编程和当前临床级别的挑战
Pub Date : 2012-12-01 DOI: 10.1142/S1568558612300016
R. Bertolotti
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引用次数: 0
S/MAR VECTORS — ALTERNATIVE EXPRESSION SYSTEMS FOR GENE THERAPY? S/ mar载体-基因治疗的替代表达系统?
Pub Date : 2012-12-01 DOI: 10.1142/S156855861230003X
C. Hagedorn, H. Lipps
Due to the lack of natural occurring plasmids in higher eukaryotes, most vectors currently used for the modification of mammalian cells and organisms are based on modified viruses. But the use of these virus-based vectors still has severe safety risks and therefore considerable efforts are made to design alternative vector systems, whose function are based on chromosomal elements and which behave as an autonomous unit in the cell. The construction of episomal vectors was hindered by our limited knowledge of the epigenetic regulation of replication in higher eukaryotes. However, in the late 1990, a prototype non-viral episomal vector was constructed which replicates autonomously in all mammalian cells and is mitotically stable in the absence of selection. Its function relies on an expression unit linked to a scaffold/matrix-attached region (S/MAR). In this short review, we describe the rational of its construction and functioning. The prototype vector was improved within the past years with respect to establishment and expression efficiency and has now been tested for various preclinical applications. Eventually, S/MAR-based vectors will be improved to such a stage that they can provide a safe alternative to viral vectors to be used in gene therapy.
由于高等真核生物缺乏天然存在的质粒,目前用于修饰哺乳动物细胞和生物体的大多数载体都是基于修饰的病毒。但是,使用这些基于病毒的载体仍然存在严重的安全风险,因此,人们做出了相当大的努力来设计替代载体系统,其功能基于染色体元素,并在细胞中作为一个自主单元发挥作用。我们对高等真核生物复制的表观遗传调控的有限知识阻碍了表观体载体的构建。然而,在20世纪90年代末,一种原型非病毒外泌体载体被构建,它在所有哺乳动物细胞中自主复制,并且在没有选择的情况下有丝分裂稳定。其功能依赖于连接到支架/基质附着区(S/MAR)的表达单元。在这篇简短的综述中,我们描述了它的结构和功能的合理性。在过去的几年里,原型载体在建立和表达效率方面得到了改进,现在已经在各种临床前应用中进行了测试。最终,基于S/ mar的载体将被改进到这样一个阶段,它们可以提供一种安全的替代病毒载体,用于基因治疗。
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引用次数: 0
MURINE PGK PROMOTER IN A LENTIVIRAL VECTOR IN CANINE LEUKOCYTE ADHESION DEFICIENCY AND IN HUMAN LAD-1 CD34+ CELLS IN NSG MICE 慢病毒载体在犬白细胞粘附缺陷和NSG小鼠lad1 cd34 +细胞中的小鼠PGK启动子
Pub Date : 2012-12-01 DOI: 10.1142/S156855861250001X
M. Hunter, U. Choi, L. Tuschong, Huifen Zhao, S. Koontz, V. Kapoor, D. Persons, H. Malech, D. Hickstein
The safety of lentiviral (LV) vectors for gene therapy of genetic hematopoietic diseases would be considerably enhanced by the identification of a non-viral promoter capable of driving therapeutic levels of transgene expression in the target cell. Here, we tested the efficacy of the murine phosphoglycerate kinase (mPgk) promoter in a self-inactivating (SIN) LV vector to express canine CD18 in animals with canine leukocyte adhesion deficiency (CLAD) and in human LAD-1 CD34+ cells in NSG mice. Despite high transduction levels and high levels of CD18 expression per cell in CLAD CD34+ cells in vitro using the mPgk vector to drive canine CD18 expression, only two of five CLAD animals treated with ex vivo gene therapy achieved therapeutic levels of CD18+ neutrophils in vivo. Similarly, despite high transduction efficiency and high levels of CD18 expression in human LAD-1 CD34+ cells in vitro, the mPgk-hCD18 promoter resulted in a low percentage of CD45+/CD18+ cells and low levels of CD18 expression per neutrophil, when the transduced cells were transplanted into NSG mice. In contrast, human LAD-1 CD34+ cells transduced with a LV vector containing the viral MND promoter (MND-hCD18) and injected into NSG mice displayed a high percentage of CD45+/CD18+ cells and high levels of CD18 expression per neutrophil. These studies demonstrated that the mPgk promoter does not direct sufficient CD18 expression in neutrophils to replace a viral promoter for gene therapy of children with LAD-1.
通过鉴定能够在靶细胞中驱动治疗水平的转基因表达的非病毒启动子,将大大提高慢病毒(LV)载体用于遗传性造血疾病基因治疗的安全性。在这里,我们测试了小鼠磷酸甘油酸激酶(mPgk)启动子在自我失活(SIN) LV载体中表达犬CD18在犬白细胞粘附缺陷(CLAD)动物和NSG小鼠的人lad1 CD34+细胞中的效果。尽管在体外使用mPgk载体驱动犬CD18的CD34+细胞的高转导水平和高水平的每细胞CD18表达,但接受体外基因治疗的5只CLAD动物中只有两只在体内达到了治疗水平的CD18+中性粒细胞。同样,尽管体外培养的人lad1 CD34+细胞转导效率高,CD18表达水平高,但mpgg - hcd18启动子在将转导后的细胞移植到NSG小鼠体内时,导致CD45+/CD18+细胞比例低,每嗜中性粒细胞CD18表达水平低。相比之下,用含有病毒MND启动子(MND- hcd18)的LV载体转导的人LAD-1 CD34+细胞注射到NSG小鼠中,显示出高百分比的CD45+/CD18+细胞和高水平的每中性粒细胞CD18表达。这些研究表明,mPgk启动子不能在中性粒细胞中指导足够的CD18表达,以取代病毒启动子用于LAD-1患儿的基因治疗。
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引用次数: 0
CORRIGENDUM TO "SMART ADENOVIRUS NANOCOMPLEXES FOR SYSTEMIC DELIVERY" “用于全身递送的智能腺病毒纳米复合物”的勘误表
Pub Date : 2011-11-20 DOI: 10.1142/S1568558611000271
E. Kang, C. Yun
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引用次数: 0
FULLY-PLURIPOTENT iPS CELLS: MOUSE TETRAPLOID COMPLEMENTATION, ETHICAL HUMAN ES-LIKE CELLS AND REPRODUCTIVE CLONING BAN 完全多能iPS细胞:小鼠四倍体互补、伦理类人细胞和生殖克隆禁令
Pub Date : 2011-11-20 DOI: 10.1142/S1568558610000148
R. Bertolotti
Full pluripotency of mouse induced pluripotent stem (iPS) cells was recently demonstrated using the tetraploid blastocyst complementation assay, thereby establishing transient transgenic expression of the "four Yamanaka transcription factors" as a bona fide reprogramming technique. Such a genesis of fertile adult "iPS" mice could revive the roguish temptation of banned human reproductive cloning currently doomed by the failure of human cell reprogramming by somatic cell nuclear transfer (SCNT). This major concern deals with a potential use of human iPS cells and contrasts with the fact that these cells stand as breakthrough ethical substitutes for current allogeneic human embryonic stem (ES) cells and planned patient-specific SCNT-ES cells. Indeed, unlike ES cells, iPS cells are generated without the need of an oocyte or a blastocyst and are therefore free of the human oocyte scarcity and embryo destruction problems. For patient-specific iPS cells, safety issues are thus the very limitation to the initiation of their bench-to-bedside translation. Full pluripotency is the first concern since it is the most stringent proof of an unbiased epigenetic reprogramming. Importantly, mouse tetraploid-complementing iPS cells have been shown to be few among the former deemed bona fide iPS cells and are thus expected to be instrumental in the identification of potential reprogramming caveats and of critical markers of the fully-pluripotent state. In this respect, hot-off-the-press data show that full pluripotency is correlated to the activity of the imprinted Dlk1-Dio3 multigenic region which is frequently aberrantly silenced in iPS cells. The stringency of the tetraploid complemention assay by mouse iPS cells is thus expected to translate soon into optimized protocols for the genesis/identification of fully-pluripotent human iPS cells. Such a full pluripotency is discussed in light of transgene-free reprogramming protocols aimed a clearing the second safety concern of iPS cell genesis: oncogenic hazards resulting from random integration of reprogramming transgenes into target-cell chromosomal DNA. In this respect, iPS cell genesis being the result of a transient gene therapy mechanism, the transient epigenetic gene therapy arm of our proposed universal stem cell gene therepy platform is presented together with concurrent approaches mediated by protein transduction, mRNA transfection and small molecules.
最近,利用四倍体囊胚互补实验证明了小鼠诱导多能干细胞的完全多能性,从而建立了“四种山中转录因子”的瞬时转基因表达,作为一种真正的重编程技术。这种具有生育能力的成年“iPS”小鼠的产生,可能会重新激起被禁止的人类生殖克隆的邪恶诱惑。目前,由于体细胞核移植(SCNT)无法对人类细胞进行重编程,人类生殖克隆注定要失败。这一主要问题涉及人类iPS细胞的潜在用途,并与这些细胞作为目前同种异体人类胚胎干细胞(ES)细胞和计划中的患者特异性SCNT-ES细胞的突破性伦理替代品的事实形成对比。事实上,与胚胎干细胞不同,iPS细胞的产生不需要卵母细胞或囊胚,因此不存在人类卵母细胞缺乏和胚胎破坏的问题。因此,对于患者特异性iPS细胞,安全性问题是其从实验室到临床转化的限制因素。完全的多能性是首要问题,因为它是无偏倚的表观遗传重编程的最严格证据。重要的是,小鼠四倍体互补的iPS细胞在之前被认为是真正的iPS细胞中已经被证明是少数,因此有望在识别潜在的重编程警告和完全多能状态的关键标记方面发挥重要作用。在这方面,热出版数据表明,完全多能性与印迹Dlk1-Dio3多基因区域的活性相关,该区域在iPS细胞中经常异常沉默。因此,通过小鼠iPS细胞进行的四倍体互补实验的严格性有望很快转化为完全多能性人类iPS细胞的生成/鉴定的优化方案。这种完全的多能性是在无转基因重编程方案的基础上讨论的,旨在清除诱导多能干细胞发生的第二个安全问题:随机整合重编程转基因到靶细胞染色体DNA中所产生的致癌危害。在这方面,iPS细胞的发生是一种瞬时基因治疗机制的结果,我们提出的通用干细胞基因治疗平台的瞬时表观遗传基因治疗臂与蛋白质转导、mRNA转染和小分子介导的并行方法一起提出。
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引用次数: 0
DROP-ON-DEMAND INKJET BIOPRINTING: A PRIMER ∗ 按需喷墨生物打印:底漆*
Pub Date : 2011-11-20 DOI: 10.1142/S1568558611000258
Kyle W. Binder, A.J. Allen, J. Yoo, A. Atala
Engineering complex biological structures for regenerative medicine, in vitro tissue analysis, and pharmaceutical testing require new fabrication techniques that can place specific cells in specific target locations. Conventional cell seeding methods cannot achieve this level of spatial resolution. Biofabrication is a rapidly advancing field that uses a variety of delivery mechanisms to achieve the spatial resolution necessary to place cells, biomaterials, and bioactive macromolecules in specific target locations. One new technique within this field is bioprinting, which uses drop-on-demand delivery mechanisms to fabricate biological structures. This review focuses on drop-on-demand inkjet bioprinting and provides a primer for researchers seeking to enter the field.
用于再生医学、体外组织分析和药物测试的复杂生物结构工程需要新的制造技术,可以将特定细胞放置在特定的目标位置。传统的细胞播种方法无法达到这种水平的空间分辨率。生物制造是一个快速发展的领域,它使用各种递送机制来实现将细胞、生物材料和生物活性大分子放置在特定目标位置所需的空间分辨率。该领域的一项新技术是生物打印,它利用按需投放的机制来制造生物结构。本文综述了液滴按需喷墨生物打印,并为寻求进入该领域的研究人员提供了一个入门。
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引用次数: 60
NEW RECOMBINANT ADENO-ASSOCIATED VIRUS (rAAV)-BASED THERAPEUTICS REACH PIVOTAL PHASE 2 CLINICAL TRIALS 新的基于重组腺相关病毒(rAAV)的治疗方法进入关键的2期临床试验
Pub Date : 2011-11-20 DOI: 10.1142/S1568558611000295
C. Mueller, S. Kaushal, M. Humphries, T. Flotte
This brief review summarizes the design of two phase 2 clinical trials of recombinant adeno-associated virus (rAAV)-based vector that are currently underway. These include a trial of a rAAV2-RPE65 vector for patients with Leber congenital amaurosis and a trial of a rAAV1-alpha-1-antitrypsin(AAT) vector delivered intramuscularly in patients with genetic emphysema due to AAT deficiency. In both cases, the current phase 2 trials were preceded by phase 1 trials indicating a good safety profile and persistent transgene expression.
本文简要综述了目前正在进行的重组腺相关病毒(rAAV)载体的两个2期临床试验的设计。其中包括一项针对Leber先天性黑内障患者的rAAV2-RPE65载体的试验,以及一项针对由于AAT缺乏而导致的遗传性肺气肿患者肌肉内递送的raav1 - α -1抗胰蛋白酶(AAT)载体的试验。在这两种情况下,目前的2期试验之前都进行了1期试验,表明具有良好的安全性和持续的转基因表达。
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引用次数: 0
EDITORIAL: "THERMAL INKJET-MEDIATED TRANSFECTION AS AN ADDITIONAL FEATURE OF BIOPRINTING" 社论:“热喷墨介导转染作为生物打印的附加功能”
Pub Date : 2011-11-20 DOI: 10.1142/S1568558611000283
R. Bertolotti
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引用次数: 0
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Gene therapy and regulation
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