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Poly(NIPAAm-co-AAm)-gold nanoshell composites for optically-triggered cancer therapeutic delivery

机译:聚(NIPAAm-co-AAm)-金纳米壳复合材料,用于光学触发的癌症治疗药物递送

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摘要

Chemotherapy regimens, one of the most common cancer treatments, are often dictated by dose-limiting toxicities. Also, the largest hurdle for translating novel biological therapies such as siRNA into the clinic is lack of an efficient delivery mechanism to get the therapeutic into malignant cells. Both of these situations would benefit from a minimally-invasive controlled release system that only delivers a therapeutic to the site of malignant tissue. This thesis presents work towards the creation of such a delivery platform using two novel material components: a thermally responsive poly[N-isopropylacrylamide-co-acrylamide] (NIPAAm-co-AAm) hydrogel and gold-silica nanoshells. Thermally responsive hydrogels undergo a physical property transition at their lower critical solution temperature (LCST). When transitioning from below to above the LCST, the hydrogel material expels large amounts of water and absorbed molecules. This phase change can be optically triggered by embedded gold-silica nanoshells, which rapidly transfer near-infrared (NIR) light energy into heat energy due to the surface plasmon resonance phenomena. When this material is loaded with absorbed drug molecules, drug release can be externally triggered by exposure to an NIR laser. Initial characterization of this material was accomplished using bulk hydrogel-nanoshell composites. Poly(NIPAAm-co-AAm)-nanoshell composites were synthesized via free radical polymerization. The LCST of the poly(NIPAAm-co-AAm) hydrogels was determined to be from 39-45 deg C, or slightly above physiologic temperature. The material was swollen in a drug solution of either doxorubicin (a common chemotherapeutic) or a 21bp dsDNA olgio (a model molecule for siRNA). Composites were then exposed to an 808 nm laser, which was found to trigger release of the therapeutics from the composite material. Further work has been done in translating this composite material to nano-scale sized particles, such that it could be injected intravenously, passively accumulate in tumor tissue, and be externally triggered to release therapeutics by exposure to an NIR laser. Sub-micron composite particles were synthesized using dissolvable gelatin templates with 500 nm wells. Analysis by transmission electron microscopy (TEM) indicates that these particles consist of gold nanoshells surrounded by a hydrogel coating. Dynamic light scattering (DLS) measurements were used to show that these particles display the same thermal properties as seen in the bulk material: collapsing in response to increased temperatures or NIR light exposure. Ultimately, the work in this thesis advances the development of a minimally-invasive, optically-triggered drug delivery platform.
机译:化学疗法是最常见的癌症治疗方法之一,通常由剂量限制的毒性决定。同样,将诸如siRNA的新型生物疗法转化为临床的最大障碍是缺乏一种有效的递送机制,以将治疗剂转化为恶性细胞。这两种情况都将受益于仅将治疗剂递送至恶性组织部位的微创控释系统。本文提出了使用两种新型材料组分创建这种递送平台的工作:一种热响应性聚[N-异丙基丙烯酰胺-共-丙烯酰胺](NIPAAm-co-AAm)水凝胶和金-二氧化硅纳米壳。热响应水凝胶在其较低的临界溶液温度(LCST)下经历物理性质转变。当从LCST的下方过渡到上方时,水凝胶材料会排出大量的水和吸收的分子。这种相变可以由嵌入的金-二氧化硅纳米壳光学触发,由于表面等离振子共振现象,其将近红外(NIR)光能快速转换为热能。当这种材料负载有吸收的药物分子时,暴露于NIR激光可从外部触发药物释放。该材料的初始表征是使用块状水凝胶-纳米壳复合材料完成的。通过自由基聚合合成了聚(NIPAAm-co-AAm)-纳米壳复合材料。聚(NIPAAm-co-AAm)水凝胶的LCST确定为39-45摄氏度,或略高于生理温度。该物质在阿霉素(一种常见的化疗药物)或21bp dsDNA olgio(一种siRNA的模型分子)的药物溶液中溶胀。然后将复合材料暴露于808 nm激光下,发现该激光可以触发治疗剂从复合材料中释放出来。在将该复合材料转化为纳米级颗粒方面,还进行了进一步的工作,以便可以静脉内注射,被动地积聚在肿瘤组织中,并通过暴露于NIR激光从外部触发释放治疗剂。使用具有500 nm孔的可溶明胶模板合成亚微米复合颗粒。通过透射电子显微镜(TEM)的分析表明,这些颗粒由被水凝胶涂层包围的金纳米壳组成。动态光散射(DLS)测量用于显示这些颗粒显示出与散装材料相同的热性能:随着温度升高或近红外曝光而崩溃。最终,本文的工作推动了微创,光学触发药物输送平台的开发。

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    Strong Laura;

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