Neuroscience Discovery, Janssen Pharmaceutical Companies of Johnson & Johnson, 3210 Merryfield Row, San Diego, CA, 92121, USA.
Alkermes, Inc., 852 Winter Street, Waltham, MA, 02451, USA.
Nat Commun. 2019 Jun 21;10(1):2746. doi: 10.1038/s41467-019-10723-x.
Nicotinic acetylcholine receptors (nAChRs) mediate and modulate synaptic transmission throughout the brain, and contribute to learning, memory, and behavior. Dysregulation of α7-type nAChRs in neuropsychiatric as well as immunological and oncological diseases makes them attractive targets for pharmaceutical development. Recently, we identified NACHO as an essential chaperone for α7 nAChRs. Leveraging the robust recombinant expression of α7 nAChRs with NACHO, we utilized genome-wide cDNA library screening and discovered that several anti-apoptotic Bcl-2 family proteins further upregulate receptor assembly and cell surface expression. These effects are mediated by an intracellular motif on α7 that resembles the BH3 binding domain of pro-apoptotic Bcl-2 proteins, and can be blocked by BH3 mimetic Bcl-2 inhibitors. Overexpression of Bcl-2 member Mcl-1 in neurons enhanced surface expression of endogenous α7 nAChRs, while a combination of chemotherapeutic Bcl2-inhibitors suppressed neuronal α7 receptor assembly. These results demonstrate that Bcl-2 proteins link α7 nAChR assembly to cell survival pathways.
烟碱型乙酰胆碱受体(nAChRs)在整个大脑中介导和调节突触传递,并有助于学习、记忆和行为。神经精神疾病以及免疫和肿瘤疾病中α7 型 nAChRs 的失调使其成为药物开发的有吸引力的靶点。最近,我们发现 NACHO 是 α7 nAChRs 的必需伴侣蛋白。利用与 NACHO 共表达的强大重组α7 nAChRs,我们利用全基因组 cDNA 文库筛选发现,几种抗凋亡 Bcl-2 家族蛋白进一步上调了受体组装和细胞表面表达。这些作用是通过α7 上类似于促凋亡 Bcl-2 蛋白 BH3 结合域的细胞内基序介导的,并且可以被 BH3 模拟物 Bcl-2 抑制剂阻断。神经元中 Bcl-2 成员 Mcl-1 的过表达增强了内源性α7 nAChRs 的表面表达,而联合使用化疗 Bcl2 抑制剂可抑制神经元α7 受体组装。这些结果表明 Bcl-2 蛋白将α7 nAChR 组装与细胞存活途径联系起来。