期刊
STEM CELL REPORTS
卷 11, 期 4, 页码 912-928出版社
CELL PRESS
DOI: 10.1016/j.stemcr.2018.08.012
关键词
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资金
- Academy of Finland [294243, 309997]
- Jane and Aatos Erkko Foundation
- Sigrid Juselius Foundation
- Maud Kuistila Foundation
- Doctoral program in Biomedicine, University of Helsinki
- Academy of Finland (AKA) [309997, 294243, 294243, 309997] Funding Source: Academy of Finland (AKA)
The in vivo niche and basic cellular properties of nephron progenitors are poorly described. Here we studied the cellular organization and function of the MAPK/ERK pathway in nephron progenitors. Live-imaging of ERK activity by a Forster resonance energy transfer biosensor revealed a dynamic activation pattern in progenitors, whereas differentiating precursors exhibited sustained activity. Genetic experiments demonstrate that MAPK/ERK activity controls the thickness, coherence, and integrity of the nephron progenitor niche. Molecularly, MAPK/ERK activity regulates niche organization and communication with extracellular matrix through PAX2 and ITGA8, and is needed for CITED1 expression denoting undifferentiated status. MAPK/ERK activation in nephron precursors propels differentiation by priming cells for distal and proximal fates induced by the Wnt and Notch pathways. Thus, our results demonstrate a mechanism through which MAPK/ERK activity controls both progenitor maintenance and differentiation by regulating a distinct set of targets, which maintain the biomechanical milieu of tissue-residing progenitors and prime precursors for nephrogenesis.
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