Sugars as Novel Cryoprotectants for Primate Oocytes

糖作为灵长类卵母细胞的新型冷冻保护剂

基本信息

批准号：
7243324
负责人：
ALI EROGLU
金额：
$ 31.1万
依托单位：
AUGUSTA UNIVERSITY
依托单位国家：
美国
项目类别：
财政年份：
2006
资助国家：
美国
起止时间：
2006-06-01 至 2010-03-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/7243324
关键词：
Area Artemia Basic Science Biological Preservation Birth Calculi Cell membrane Cells Chemicals Condition Coupled Cryopreservation Cryoprotective Agents Culture Media Cytosol Derivation procedure Desiccation Development Developmental Biology Dimethyl Sulfoxide Embryo Embryonic Development Ensure Ethical Issues Ethylene Glycols Excision Female infertility Fertilization Freezing Glass Goals Human Ice Infertility Injury Intracellular Transport Legal Malignant Neoplasms Mammalian Cell Medical Technology Methods Modeling Molecular Weight Mus Nature Oocytes Organism Outcome Pathway interactions Permeability Preservation Technique Primates Procedures Propylene Glycols Protocols documentation Rana Rate Reproduction Research Research Personnel Salts Scheme Science Sodium Chloride Solutions Somatic Cell Specific qualifier value Stress Testing Thermodynamics Toxic effect Transition Temperature Trehalose Water base cell type coping cryobiology embryonic stem cell ethylene glycol extracellular improved molecular size nonhuman primate novel novel strategies nuclear reprogramming programs research study sugar

项目摘要

DESCRIPTION (provided by applicant): The overall goal of this proposal is to develop a novel preservation technique for primate oocytes. Oocytes are unique totipotent cells that offer exceptional prospects for studying fundamental developmental biology, as successfully explored in many areas including nuclear reprogramming and derivation of embryonic stem cells. Therefore, successful banking of oocytes from different model species would enormously contribute to the advancement of science, medical technologies, and conservation of endangered species. A cryopreservation method developed and thoroughly tested using non-human primate oocytes would not only facilitate basic research and conservation of endangered primates but would also be a major stepping-stone towards a reliable preservation protocol for human oocytes for infertility treatment. To this end, we propose a mechanistic novel approach based on survival schemes in nature where a variety of organisms such as frogs, tardigrades, and brine shrimp can survive freezing or almost complete drying. Accumulation of sugars is extremely critical for their survival strategy. By overcoming the permeability barrier of mammalian cell membranes to the sugars, recent studies have clearly demonstrated improved cryosurvival of somatic cells. Therefore, we hypothesize that when present both inside and outside cells, sugars protect oocytes against freezing-induced injury by their excellent glass formation abilities and direct interactions with subcellular components. We also hypothesize that combinations of sugars with conventional penetrating cryoprotectants and development of a novel sugar-based freezing medium will further improve cryosurvival. We will test these hypotheses systematically using intra- and extracellular sugars with different glass transition temperatures and molecular sizes, and then combining the most effective sugars with conventional cryoprotectants. Next, using a coupled mechanistic model of water transport and intracellular ice formation, we will establish an optimal thermodynamic pathway for oocyte freezing in the presence of sugar/cryoprotectant. Finally, we will test developmental capacity of cryopreserved oocytes to term. Our studies will contribute to understanding fundamental aspects of oocyte cryobiology as well as cryoprotective mechanisms of sugars. We predict that the proposed research will result in a reliable preservation technique for primate oocytes by circumventing many of the difficulties associated with conventional protocols.

描述（由申请人提供）：该提案的总体目标是为灵长类动物卵母细胞开发一种新颖的保存技术。卵母细胞是独特的全能细胞，为研究基本发育生物学提供了出色的前景，如许多领域，包括核重编程和胚胎干细胞的推导。因此，来自不同模型物种的卵母细胞的成功储存将极大地促进科学，医疗技术和濒危物种的保护。使用非人类灵长类动物卵母细胞开发和彻底测试的冷冻保存方法不仅会促进濒危灵长类动物的基础研究和保护，而且还将是针对不育治疗的人类卵母细胞可靠保存方案的主要阶梯。为此，我们提出了一种基于自然界生存方案的机械新方法，其中各种生物（例如青蛙，tardrages和盐水虾）可以在冰冻或几乎完全干燥时生存。糖的积累对于其生存策略至关重要。通过克服哺乳动物细胞膜对糖的渗透性屏障，最近的研究清楚地表明，体细胞的冷冻寿命得到了改善。因此，我们假设当存在内部和外部细胞时，糖会通过其出色的玻璃形成能力和与亚细胞成分直接相互作用来保护卵母细胞免受冻结诱导的损伤。我们还假设，糖与常规穿透性冷冻保护剂的组合以及新型的基于糖的冰冻培养基的开发将进一步改善冷冻保护剂。我们将使用具有不同玻璃过渡温度和分子大小的细胞内和细胞外糖系统地测试这些假设，然后将最有效的糖与常规的冷冻保护剂结合在一起。接下来，使用水传输和细胞内冰形成的耦合机械模型，我们将在存在糖/冷冻保护剂的情况下建立最佳的热力学途径，以冻结卵母细胞。最后，我们将测试冷冻保存卵母细胞的发育能力。我们的研究将有助于理解卵母细胞冷冻生物学的基本方面以及糖的冷冻保护机制。我们预测，拟议的研究将通过规避与常规方案相关的许多困难，从而为灵长类动物卵母细胞提供可靠的保存技术。