A set of spectrally diverse stilbazolium dyes was identified in an uptake assay using cultured brainstem and cerebellum cells isolated from e19 chicks. Pretreatment of cells with indatraline, a monoamine reuptake inhibitor, allowed identification of dyes that may interact with monoamine transporters. Two structurally related, yet spectrally segregated, probes, (E)-1-methyl-4-[2-(2-naphthalenyl)ethenyl]-pyridinium iodide (NEP+, 3A) and (E)-4-[2-(6-hydroxy-2-naphthalenyl)ethenyl]-1-methyl-pyridinium iodide (HNEP+, 4A), were selected and further investigated using HEK-293 cells selectively expressing dopamine, norepinephrine or serotonin transporters. HNEP+ was selectively accumulated viacatecholamine transporters, with the norepinephrine transporter (NET) giving the highest response; NEP+ was not transported, though possible binding was observed. The alternate modes of interaction enable the use of NEP+ and HNEP+ to image distinct cell populations in live brain tissue explants. The preference for HNEP+ accumulation viaNET was confirmed by imaging uptake in the absence and presence of desipramine, a norepinephrine reuptake inhibitor.
利用从 e19 雏鸡分离的脑干和小脑培养细胞进行摄取试验,鉴定了一组光谱多样的苯并唑鎓
染料。用单胺再摄取
抑制剂吲达曲林对细胞进行预处理,从而鉴定出可能与单胺转运体相互作用的
染料。(E)-1-甲基-4-[2-(2-
萘基)
乙烯基]-
吡啶鎓
碘化物(
NEP+,3A)和(E)-4-[2-(6-羟基-2-
萘基)
乙烯基]-1-
甲基吡啶鎓
碘化物(H
NEP+、4A),并使用选择性表达
多巴胺、
去甲肾上腺素或
血清素转运体的 HEK-293 细胞进行了进一步研究。H
NEP+ 在
乙酰胆碱转运体中选择性积累,
去甲肾上腺素转运体(NET)的反应最高;
NEP+ 没有转运,但观察到可能的结合。通过交替的相互作用模式,
NEP+ 和 H
NEP+ 可以对活体脑组织外植体中的不同细胞群进行成像。通过对
去甲肾上腺素再摄取
抑制剂地西帕明不存在和存在时的摄取成像,证实了 H
NEP+ 通过 NET 聚集的偏好。