Advancing biophysical measurements to provide a better understanding of peri-implant inflammation and to inform materials development.

金属生物材料被用作常规医疗保健的一部分，以替换或修复丢失或受损的组织，但目前使用的材料经常与不良生物反应相关。这些事件与感染或对植入物衍生物（金属表面、颗粒、离子和金属改性生物分子）的生物反应或组合有关。一个关键的缺陷是我们对失败种植体周围的物理化学环境的理解。虽然有许多工业和学术主导的计划旨在开发新的合金和表面，但我们仍然对组织中发现的植入物金属衍生物的形式以及它们与哪些细胞和生物途径相互作用的了解不足。** 我们采取的方法是，为了真正了解如何开发下一代金属生物材料，我们必须能够了解它们的行为，而不仅仅是1年，2年或3年后，而是几十年后。为了实现这一目标，我们以前的工作已经强调了一些领域，其中属于NSERC职权范围内的技术发展将是必要的。在这项发现资助的过程中，我们的目标是：** 首先，开发新的相关同步辐射X射线荧光（SR-XRF）/X射线吸收光谱（XAS）成像协议。对组织和细胞群的2D SR-XRF测量已经得到了很好的建立，但数据很少与基础组织组成相关。分析因样品变形而变得复杂，并且在存在不均匀元素分布的情况下（例如植入物周围组织）最为复杂。利用镧系元素的L-III能边与常用生物医用合金元素的k边激发能相近的特点，（钴，铬，钛），我们的目标是开发技术，使用单一的成像模式和二次（镧系）金属缀合的抗体来区分潜在的细胞组成，同时允许理解感兴趣的元素的位置和物种形成。其次，开发方法，允许更多的生物学信息植入材料和器械开发。我们将根据我们的试验数据开发方法，以模拟腐蚀行为和植入物衍生物释放，这更能代表器械的长期性能。与正在开发新型合金（包括钛基块体金属玻璃）的外部合作伙伴合作（参见-CCV H2020-MSCA-IF-GLASSIX），我们将在使用一组已建立的试验进行生物相容性试验之前模拟生物腐蚀和机械辅助腐蚀行为（有前途的成分）。这些“常规”生物测定将通过SR-XAS测量进行补充，以验证暴露并监测植入物衍生产品的形态发生的后续细胞介导的修饰。

Metallic biomaterials are used as part of routine healthcare to replace or repair lost or damaged tissues but the currently used materials are frequently associated with adverse biological responses. These events are linked to either infection or to biological responses to implant derivatives (metal surfaces, particles, ions, and metal modified bio-molecules) or a combination. A key deficiency is our understanding of the physico-chemical environment which develops around the failing implant. Whilst there are numerous industrial and academic led programs aiming to develop new alloys and surfaces we still have an inadequate understanding of the form implant metal derivatives are found in tissues and with which cells and biological pathways they interact. ******We take the approach that to really understand how to develop the next generation of metallic biomaterials we must be able to understand how they behave, not just after 1, 2 or 3 years, but after several decades. To achieve this, our previous work has highlighted a number of areas where technological developments falling within the NSERC remit will be required. Over the course of this discovery grant we aim to:******Firstly, develop novel correlative synchrotron radiation-X-Ray fluorescence (SR-XRF)/ X-ray absorption spectroscopic (XAS) imaging protocols. 2D SR-XRF measurements on tissues and on cell populations are well established but data is infrequently correlated with the underlying tissue composition. Analysis is complicated by sample distortion and is most complicated where heterogeneous elemental distributions exist (such as peri-implant tissues). Taking advantage of the fact that L-III energy edges of Lanthanides lie close to the k-edge excitation energies of common biomedical alloy elements (Co, Cr, & Ti) we aim to develop techniques using a single imaging modality and secondary (lanthanide) metal-conjugated antibodies to discriminate the underlying cellular composition, whilst at the same time allowing understanding of the location and speciation of elements of interest.******Secondly, develop methods to allow more biologically informed implant materials and device development. We will develop methods based on our pilot data to simulate corrosion behavior and implant derivative release that is more representative of long-term device performance. Working with external established collaborative partners who are developing novel alloys including Ti-based bulk metallic glasses (see-CCV H2020-MSCA-IF-GLASSIX) we will simulate biocorrosion and mechanically assisted corrosion behavior (of promising compositions) prior to biological compatibility testing using a panel of established assays. These ‘conventional' biological assays will be complemented by SR-XAS measurements to validate exposures and monitor subsequent cellular mediated modifications to the speciation of the implant derived products.