Alvarez Xavier, Wallis Zoey K, Midkiff Cecily C, Mallard Jaclyn, Didier Pete J, Williams Kenneth C
Res Sq. 2025 May 20:rs.3.rs-6435804. doi: 10.21203/rs.3.rs-6435804/v1.
We use intracisternal (i.c.) injection of fluorescent-superparamagnetic iron oxide nanoparticles (SPION) in SIV-infected monkeys that labeled CNS CD68-CD163-CD206 perivascular, meningeal, and choroid plexus (CP) macrophages. SPION + CD163 + macrophages are also found in the optic nerves, nasal septum, and cribriform plate - potential sites-paths of macrophage exit. Outside the CNS CD163 + SPION + macrophages labeled in the CNS are in deep cervical lymph node (dCLN), spleen, dorsal root ganglia (DRG). CD163 + SPION + CNS macrophages are abundant 24 hours p.i. in normal animals and decrease over time without CNS inflammation, but accumulate with SIV infection and inflammation. Greater numbers of SPION + macrophages traffic out of the CNS in normal animals and decrease with infection. Productively infected, SPION + macrophages are found in the CNS and dCLN, spleen, and DRG of infected animals 7-14 days post i.c. injection. These data are consistent with SPION + macrophages, some of which are viral infected, trafficking out of the CNS.
我们对感染猴免疫缺陷病毒(SIV)的猴子进行脑池内(i.c.)注射荧光超顺磁性氧化铁纳米颗粒(SPION),这些纳米颗粒标记了中枢神经系统(CNS)中血管周围、脑膜和脉络丛(CP)的CD68⁻CD163⁻CD206巨噬细胞。在视神经、鼻中隔和筛板(巨噬细胞潜在的出口部位和路径)也发现了SPION⁺CD163⁺巨噬细胞。在中枢神经系统之外,在中枢神经系统中标记的CD163⁺SPION⁺巨噬细胞存在于颈深淋巴结(dCLN)、脾脏、背根神经节(DRG)中。在正常动物中,感染后24小时CD163⁺SPION⁺中枢神经系统巨噬细胞数量丰富,在没有中枢神经系统炎症的情况下会随时间减少,但在SIV感染和炎症时会积累。在正常动物中,有更多数量的SPION⁺巨噬细胞从中枢神经系统流出,而在感染时会减少。在脑池内注射后7 - 14天,在感染动物的中枢神经系统、颈深淋巴结、脾脏和背根神经节中发现了高效感染的SPION⁺巨噬细胞。这些数据与SPION⁺巨噬细胞(其中一些被病毒感染)从中枢神经系统流出一致。