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CFTR抑制PDX1轴,以控制胰腺管道细胞命运

Pavana G Rotti¹, Yaling Yi², Grace Gasser²

¹Whitehead Institute, MIT, Cambridge, MA, USA.

|December 17, 2024

概括

囊性纤维化 (CF) 模型显示,囊性纤维化导电性调节器 (CFTR) 蛋白质,而不是其通道功能,影响胰腺重塑. CFTR蛋白质的损失驱动着管道变化,影响CF中的小岛功能.

科学领域:

细胞生物学细胞生物学
遗传学遗传学是一个
内分泌学在内分泌学.

背景情况:

胰腺重塑,包括炎症,性缩和导管性增生,发生在缺乏功能性囊性纤维化导电调节器 (CFTR) 通道的囊性纤维化 (CF) 犬中.
这种重塑与短暂的葡萄糖不耐受性,岛屿破坏和高可塑性管道附近的再生有关,但潜在的管道上皮质变化及其对岛屿功能的影响仍然不清楚.

研究的目的:

调查CF管道上皮质的表型变化及其对CF小岛功能的影响.
阐明CFTR影响胰腺外分泌和内分泌重塑的细胞自主机制.

主要方法:

在CF小鹿模型中利用了大量RNA测序 (RNA-seq),单细胞RNA测序 (scRNA-seq) 和通过测序 (ATAC-seq) 检测转移酶可访问的染色质.
分析基因表达和染色质可访问性,以了解管状细胞状态和信号通路.

主要成果:

证明管道CFTR蛋白通过维持PTEN和GSK3β激活来限制PDX1的表达.
表明,在没有CFTR蛋白的情况下,中枢细胞采用双能原始细胞样状态,具有增强的WNT/β-Catenin,TGF-β和AKT信号传递.
证实了CFTR蛋白的水平,而不是它的通道功能,调节PDX1表达.

结论:

发现了一种细胞自主,CFTR依赖的机制,影响CF的胰腺重塑.
这种机制解释了CFTR突变如何产生很少或没有蛋白质可以影响胰腺外分泌和内分泌重塑在CF的个体.

关键词:

细胞生物学细胞生物学分子生物学分子生物学生理学生理学生理学文字转录学 (Transcriptomics) 是一个学科.

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