Qu Na, Daoud Abdelkader, Kechele Daniel O, Cleary Cassie E, Múnera Jorge O
Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA.
Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229-3039, USA.
iScience. 2025 Apr 10;28(5):112398. doi: 10.1016/j.isci.2025.112398. eCollection 2025 May 16.
The cloaca is a transient structure that forms in the terminal hindgut giving rise to the rectum dorsally and the urogenital sinus ventrally. Similarly, human hindgut cultures derived from human pluripotent stem cells generate human colonic organoids (HCOs) which also contain co-developing urothelial tissue. In this study, our goal was to identify pathways involved in cloacal patterning and apply this to human hindgut cultures. RNA sequencing (RNA-seq) data comparing dorsal versus ventral cloaca in e10.5 mice revealed that WNT signaling was elevated in the ventral versus dorsal cloaca. Inhibition of WNT signaling in hindgut cultures maintained their differentiation toward colonic organoids. WNT activation promoted differentiation toward human urothelial organoids (HUOs). HUOs contained developmental stage specific cell types present in mammalian urothelial tissue including co-developing mesenchyme. Therefore, HUOs offer a powerful model for dissecting the regulatory pathways that control the dynamic emergence of stage specific cell types within the human urothelium.
泄殖腔是一种短暂的结构,形成于终末后肠,在背侧产生直肠,在腹侧产生泌尿生殖窦。同样,源自人类多能干细胞的人类后肠培养物会生成人类结肠类器官(HCO),其中也包含共同发育的尿路上皮组织。在本研究中,我们的目标是确定参与泄殖腔模式形成的途径,并将其应用于人类后肠培养物。比较e10.5小鼠背侧与腹侧泄殖腔的RNA测序(RNA-seq)数据显示,腹侧泄殖腔中的WNT信号相对于背侧泄殖腔有所升高。在后肠培养物中抑制WNT信号可维持其向结肠类器官的分化。WNT激活促进了向人类尿路上皮类器官(HUO)的分化。HUO包含哺乳动物尿路上皮组织中存在的发育阶段特异性细胞类型,包括共同发育的间充质。因此,HUO为剖析控制人类尿路上皮内阶段特异性细胞类型动态出现的调控途径提供了一个强大的模型。
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