Division of Ophthalmology, Ann & Robert H. Lurie Children's Hospital of Chicago, 225 E. Chicago Ave., Chicago, IL 60611, USA.
Department of Ophthalmology, Feinberg School of Medicine, Northwestern University, 645 N. Michigan Ave., Chicago, IL 60611, USA.
Cells. 2024 Sep 2;13(17):1473. doi: 10.3390/cells13171473.
A complete understanding of neural crest cell mechanodynamics during ocular development will provide insight into postnatal neural crest cell contributions to ophthalmic abnormalities in adult tissues and inform regenerative strategies toward injury repair. Herein, single-cell RNA sequencing in zebrafish during early eye development revealed keratin intermediate filament genes and as additional factors expressed during anterior segment development. In situ hybridization and immunofluorescence microscopy confirmed and expression in the early neural plate border and migrating cranial neural crest cells. Morpholino oligonucleotide (MO)-mediated knockdown of K8 and K18a.1 markedly disrupted the migration of neural crest cell subpopulations and decreased neural crest cell marker gene expression in the craniofacial region and eye at 48 h postfertilization (hpf), resulting in severe phenotypic defects reminiscent of neurocristopathies. Interestingly, the expression of K18a.1, but not K8, is regulated by retinoic acid (RA) during early-stage development. Further, both keratin proteins were detected during postnatal corneal regeneration in adult zebrafish. Altogether, we demonstrated that both K8 and K18a.1 contribute to the early development and postnatal repair of neural crest cell-derived ocular tissues.
全面了解神经嵴细胞在眼部发育过程中的力学特性,将有助于深入了解成年组织中颅神经嵴细胞对眼部异常的后天贡献,并为损伤修复的再生策略提供信息。本文在斑马鱼早期眼部发育过程中进行了单细胞 RNA 测序,发现角蛋白中间丝基因 和 是前节发育过程中表达的另外两个因子。原位杂交和免疫荧光显微镜证实 和 在早期神经板边界和迁移的颅神经嵴细胞中表达。利用 morpholino 寡核苷酸(MO)介导的 K8 和 K18a.1 敲低,显著破坏了神经嵴细胞亚群的迁移,并降低了颅面区域和受精后 48 小时(hpf)眼部的神经嵴细胞标记基因表达,导致严重的表型缺陷,类似于神经嵴病。有趣的是,K18a.1 的表达(而非 K8)在早期发育过程中受到视黄酸(RA)的调控。此外,在成年斑马鱼的眼后角膜再生过程中,均检测到这两种角蛋白蛋白。总之,我们证明 K8 和 K18a.1 均有助于神经嵴细胞源性眼部组织的早期发育和后天修复。