Celsr1 suppresses Wnt5a-mediated chemoattraction to prevent incorrect rostral migration of facial branchiomotor neurons.

Celsr1 suppresses Wnt5a-mediated chemoattraction to prevent incorrect rostral migration of facial branchiomotor neurons.
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DOI:
10.1242/dev.200553
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发表时间:
2022-11-15
期刊:
Development (Cambridge, England)
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其他
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在发育中的后脑中,面部鳃运动 (FBM) 神经元从菱核 4 (r4) 向尾部迁移到 r6,以建立驱动下颌运动的回路。尽管调节 FBM 神经元迁移起始的机制已明确定义,但调节方向性的机制尚未明确。在缺乏 Wnt/平面细胞极性 (PCP) 成分 Celsr1 的突变体中,许多 FBM 神经元不适当地迁移到 r3。我们假设 Celsr1 通常通过抑制 r3 中对 Wnt5a 的化学吸引来阻止 FBM 神经元的不适当的吻端迁移,并成功测试了该模型。首先,Celsr1 中的 FBM 神经元; Wnt5a 双突变体胚胎从未向嘴部迁移,表明 Celsr1 突变体中不适当的嘴部迁移是由 Wnt5a 介导的化学吸引引起的,而在野生型胚胎中该化学吸引受到抑制。其次,FBM 神经元向置于野生型后脑外植体 r3 中的 Wnt5a 包被珠向头侧迁移,表明过量的 Wnt5a 趋化剂可以克服内源性 Celsr1 介导的抑制。第三,在 r3 中过表达 Wnt5a 的 Celsr1 突变体中,FBM 神经元的吻侧迁移大大增强。这些结果揭示了 Wnt/PCP 成分通过抑制化学吸引来调节神经元迁移的新作用。摘要:有证据表明细胞粘附受体通过抑制分泌蛋白的吸引力来调节小鼠神经元迁移,从而发挥先前未报道的作用。
In the developing hindbrain, facial branchiomotor (FBM) neurons migrate caudally from rhombomere 4 (r4) to r6 to establish the circuit that drives jaw movements. Although the mechanisms regulating initiation of FBM neuron migration are well defined, those regulating directionality are not. In mutants lacking the Wnt/planar cell polarity (PCP) component Celsr1, many FBM neurons inappropriately migrate rostrally into r3. We hypothesized that Celsr1 normally blocks inappropriate rostral migration of FBM neurons by suppressing chemoattraction towards Wnt5a in r3 and successfully tested this model. First, FBM neurons in Celsr1; Wnt5a double mutant embryos never migrated rostrally, indicating that inappropriate rostral migration in Celsr1 mutants results from Wnt5a-mediated chemoattraction, which is suppressed in wild-type embryos. Second, FBM neurons migrated rostrally toward Wnt5a-coated beads placed in r3 of wild-type hindbrain explants, suggesting that excess Wnt5a chemoattractant can overcome endogenous Celsr1-mediated suppression. Third, rostral migration of FBM neurons was greatly enhanced in Celsr1 mutants overexpressing Wnt5a in r3. These results reveal a novel role for a Wnt/PCP component in regulating neuronal migration through suppression of chemoattraction. Summary: Evidence for a previously unreported role for a cell-adhesion receptor in regulating neuronal migration in mice by suppressing attraction for a secreted protein.
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