Particle shape dependence of CD8+ T cell activation by artificial antigen presenting cells

详细信息    查看全文

• 作者：Joel C. Sunshine ; Karlo Perica ; Jonathan P. Schneck ; Jordan J. Green
• 关键词：Artificial antigen presenting cells ; Particle shape ; Ellipsoidal ; Biomimetic ; Microparticles ; Immunotherapy
• 刊名：Biomaterials
• 出版年：January, 2014
• 年：2014
• 卷：35
• 期：1
• 页码：269-277
• 全文大小：2192 K

文摘

Previous work developing particle-based acellular, artificial antigen presenting cells (aAPCs) has focused exclusively on spherical platforms. To explore the role of shape, we generated ellipsoidal PLGA microparticles with varying aspect ratios (ARs) and synthesized aAPCs from them. The ellipsoidal biomimetic aAPCs with high-AR showed significantly enhanced in聽vitro and in聽vivo activity above spherical aAPCs with particle volume and antigen content held constant. Confocal imaging indicates that CD8+ T cells preferentially migrate to and are activated by interaction with the long axis of the aAPC. Importantly, enhanced activity of high-AR aAPCs was seen in a mouse melanoma model, with high-AR aAPCs improving melanoma survival compared to non-cognate aAPCs (p聽=聽0.004) and cognate spherical aAPCs (p聽=聽0.05). These findings indicate that particle geometry is a critical design criterion in the generation of aAPCs, and may offer insight into the essential role of geometry in the interaction between CD8+ T cells and biological APCs.