Tying Distinct Nanoparticle Properties to Cellular Interactions, Fate and Respons

描述(由申请人提供)：本申请是为了响应重大机遇(RC2)：工程纳米材料环境健康与安全。在工业和医疗应用中越来越多地使用工程纳米材料，预计会增加意外的环境或职业暴露以及预期的医疗或直接消费者暴露，但此类暴露对人类健康的影响尚不清楚。工程纳米材料的潜在毒性或生物相容性取决于细胞相互作用和颗粒的命运，这些颗粒决定了细胞的反应，并最终决定了对人类健康的影响。细胞的相互作用和随后的细胞反应由粒子的物理和化学性质决定，但粒子属性和这些细胞过程之间的关系还远未被理解。此外，纳米材料的性质可能会受到环境的影响，例如环境空气，但这些变化也不清楚。这项建议的目的是确定空气中工程纳米材料的不同性质与它们在气液界面上的肺泡上皮细胞中的细胞相互作用、命运和反应之间的关系，以支持对吸入非材料的毒性或生物相容性的预测评估。进入呼吸道的空气纳米材料很可能沉积在肺泡区，那里发现了肺泡上皮细胞。这些细胞为逃脱肺泡巨噬细胞第一道防线的颗粒提供了一个脆弱的靶点。越来越多的观察表明，纳米材料很可能以单独的粒子或小的纳米级聚集体的形式呈现给体内的肺泡细胞，这与较大的粒子与细胞相互作用的能力不同。我们将建立真实暴露于环境空气中定义明确的单分散纳米材料的方法，以描绘与空气悬浮颗粒相关的不同性质之间的关系，以及它们对空气-液体界面上的肺泡上皮细胞的影响。大小排斥方法将确保暴露在单个纳米颗粒或小纳米级聚集体中，因为它们很可能被呈现给体内的细胞。基于我们在单分子灵敏度定量荧光成像方面的经验，结合分子生物学技术，我们将一次调查一个纳米颗粒或纳米级聚集体的细胞相互作用和命运，描绘与单个纳米颗粒的性质和体内暴露相关的细胞过程。我们建议将重点放在表面修饰和未修饰的二氧化钛和无定形二氧化硅纳米颗粒上，它们已经在不同的应用中得到了广泛的应用，并构成了潜在的空气暴露的重要来源。利用分析和物理化学方法，将表征在气液界面收集的颗粒的性质。这些信息将得出环境空气中纳米材料发生的变化，并描绘与空气中纳米粒子及其在体内的细胞相互作用和影响相关的性质。总之，我们的研究将在空气中纳米材料的性质与它们的细胞相互作用、命运和响应之间获得关键的新关系，支持对吸入纳米材料的毒性或生物兼容性的预测评估。新的信息将产生大规模的影响，通过指导预防性方法，保护人类健康免受工程纳米材料的不利影响，并为新的工业和医疗应用设计安全的纳米材料。 公共卫生相关性：在工业和医疗应用中越来越多地使用工程纳米材料，预计会增加意外的环境或职业暴露以及预期的医疗或直接消费者暴露，但此类暴露对人类健康的影响尚不清楚。工程纳米材料的潜在毒性或生物相容性取决于细胞相互作用和颗粒的命运，这些颗粒决定了细胞的反应，并最终决定了对人类健康的影响。这些细胞相互作用和随后的细胞反应是由粒子的物理和化学性质决定的，但粒子属性和这些细胞过程之间的关系还远未被理解。我们的研究将通过确定空气中纳米材料的性质与其细胞相互作用、命运和响应之间的关键新关系来满足特定的呼吁和公共卫生需求，支持对吸入纳米材料的毒性或生物兼容性的预测性评估。新的信息将产生大规模的影响，通过指导预防性方法，保护人类健康免受工程纳米材料的不利影响，并为新的工业和医疗应用设计安全的纳米材料。

DESCRIPTION (provided by applicant): This application is submitted in response to Grand Opportunities (RC2): Engineered Nanomaterial Environmental Health and Safety. The increasing use of engineered nanomaterials in industrial and medical applications is expected to increase both unintended environmental or occupational exposures and intended medical or direct consumer exposures, but the impact of such exposures on human health is unclear. The potential toxicity or biocompatibility of engineered nanomaterials is governed by the cellular interactions and fate of the particles, which dictate the cellular response and ultimately determine the impact on human health. The cellular interactions and subsequent response of the cells are governed by the physical and chemical properties of the particles, but the relationships between particle properties and these cellular processes are far from being understood. Furthermore, the properties of nanomaterials are likely to be modified by the environment, such as ambient air, but these changes are also unclear. The purpose of this proposal is to identify relationships between distinct properties of airborne engineered nanomaterials and their cellular interactions, fate, and response in alveolar epithelial cells at the air- liquid interface with the goal of supporting predictive evaluation of inhaled nonmaterial's toxicity or biocompatibility. Airborne nanomaterials that enter the respiratory tract are likely to be deposited in the alveolar region, where alveolar epithelial cells are found. These cells provide a vulnerable target for particles that escape the first line of defense by the alveolar macrophages. Accumulating observations indicate that nanomaterials are likely to be presented to alveolar cells in vivo as individual particles or small nanoscale aggregates, which differ from the larger particles in their ability to interact with the cells. We will establish methods for realistic exposures to well-defined monodispersed nanomaterials in ambient air for delineating relationships between distinct properties that are relevant to airborne particles and their impact on alveolar epithelial cells at the air- liquid interface. Size exclusion methods will ensure exposures to individual nanoparticles or small nanoscale aggregates, as they are likely to be presented to the cells in vivo. Building on our experience in quantitative fluorescence imaging with single molecule sensitivity, combined with molecular biology techniques, we will investigate the cellular interactions and fate of one nanoparticle or nanoscale aggregate at a time, delineating cellular processes that are relevant to the properties of the individual nanoparticle and the exposures in vivo. We propose to focus on surface modified and unmodified titania and amorphous silica nanoparticles, which have been widely used in diverse applications and pose a significant source for potential airborne exposures. Using analytical and physical chemistry methods, the properties of the particles, collected at the air-liquid interface, will be characterized. This information will derive changes that occur to nanomaterials in ambient air and delineate properties that are relevant to airborne nanoparticles and their cellular interactions and impact in vivo. Together, our studies will gain critical new relationships between properties of airborne nanomaterials and their cellular interactions, fate and response, supporting predictive evaluation of toxicity or biocompatibility of inhaled nanomaterials. The new information will have a large scale impact by guiding preventative approaches that will protect human health from adverse effects of engineered nanomaterials and the design of safe nanomaterials for new industrial and medical applications. PUBLIC HEALTH RELEVANCE: The increasing use of engineered nanomaterials in industrial and medical applications is expected to increase both unintended environmental or occupational exposures and intended medical or direct consumer exposures, but the impact of such exposures on human health is unclear. The potential toxicity or biocompatibility of engineered nanomaterials is governed by the cellular interactions and fate of the particles, which dictate the cellular response and ultimately determine the impact on human health. These cellular interactions and subsequent response of the cells are governed by the physical and chemical properties of the particles, but the relationships between particle properties and these cellular processes are far from being understood. Our research will address the specific call and public health needs by identifying critical new relationships between properties of airborne nanomaterials and their cellular interactions, fate and response, supporting predictive evaluation of toxicity or biocompatibility of inhaled nanomaterials. The new information will have a large scale impact by guiding preventative approaches that will protect human health from adverse effects of engineered nanomaterials and the design of safe nanomaterials for new industrial and medical applications.