Maturation Status of Rat Lung Epithelial Cells in Interspecies Chimeras Generated by Blastocyst Complementation

IF 1.3 4区 生物学 Q4 CELL BIOLOGY
Genes to Cells Pub Date : 2025-08-21 DOI:10.1111/gtc.70046
Yamato Murata, Shunsuke Yuri, Masahito Ikawa, Ayako Isotani
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Abstract

This study investigates the maturation status of rat lung epithelial cells in interspecies chimeras generated via blastocyst complementation (BC) using Fgfr2b-knockout mouse embryos. In our previous study, we succeeded in generating rat-derived lung epithelium in interspecies chimeras using tetraploid complementation; however, the resulting cells remained immature and failed to support respiratory function. In this study, we established two Fgfr2b-KO mouse lines via CRISPR/Cas9 and injected GFP-labeled rat embryonic stem (ES) cells into blastocysts, which were then transferred to pseudopregnant female mice. Comparative histological analysis of airway spaces between wild-type rat lungs (E19.5–E21.5) and BC chimeras revealed that BC lungs reached a maturation stage comparable to E20.5–E21.5 rat lungs. Quantitative Polymerase Chain Reaction of key epithelial maturation markers—including ENaC subunits, Aqp5, and surfactant protein genes—demonstrated late-gestational upregulation in wild-type rat lungs, while expression levels in BC lungs exhibited significant inter-individual variability, corresponding to stages between E19.5 and E21.5 in wild-type rats. These findings suggest that the mouse host environment may partially promote maturation of rat-derived lung epithelial cells; however, additional mechanisms are likely required to achieve functional respiratory capacity.

Abstract Image

胚泡互补产生的种间嵌合体中大鼠肺上皮细胞的成熟状态
本研究研究了fgfr2b敲除小鼠胚胎通过囊胚互补(BC)产生的种间嵌合体中大鼠肺上皮细胞的成熟状态。在我们之前的研究中,我们成功地利用四倍体互补在种间嵌合体中产生了大鼠来源的肺上皮;然而,产生的细胞仍然不成熟,不能支持呼吸功能。在这项研究中,我们通过CRISPR/Cas9建立了两个Fgfr2b-KO小鼠系,并将gfp标记的大鼠胚胎干(ES)细胞注射到囊胚中,然后将囊胚转移到假妊娠雌性小鼠身上。野生型大鼠肺(E19.5-E21.5)和BC嵌合体之间气道间隙的比较组织学分析显示,BC肺达到了与E20.5-E21.5大鼠肺相当的成熟阶段。关键上皮成熟标志物(包括ENaC亚基、Aqp5和表面活性剂蛋白基因)的定量聚合酶链反应显示,野生型大鼠的肺在妊娠晚期出现上调,而BC肺的表达水平在个体间表现出显著的差异,对应于野生型大鼠的E19.5和E21.5之间的阶段。这些发现表明,小鼠宿主环境可能部分促进大鼠源性肺上皮细胞的成熟;然而,可能需要额外的机制来实现功能性呼吸能力。
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来源期刊
Genes to Cells
Genes to Cells 生物-细胞生物学
CiteScore
3.40
自引率
0.00%
发文量
71
审稿时长
3 months
期刊介绍: Genes to Cells provides an international forum for the publication of papers describing important aspects of molecular and cellular biology. The journal aims to present papers that provide conceptual advance in the relevant field. Particular emphasis will be placed on work aimed at understanding the basic mechanisms underlying biological events.
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