Cell type-specific expression of fasciclin II isoforms reveals neuronal-glial interactions during peripheral nerve growth.

Cell type-specific expression of fasciclin II isoforms reveals neuronal-glial interactions during peripheral nerve growth.
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成束蛋白 II 亚型的细胞类型特异性表达揭示了周围神经生长过程中神经元-胶质细胞的相互作用。

DOI:
10.1006/dbio.2001.0247
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发表时间:
2001
期刊:
Developmental biology.
影响因子:
--
通讯作者:
Copenhaver,PF
Copenhaver,PF
中科院分区:
--
文献类型:
--
作者:
Wright,JW;Copenhaver,PF

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在昆虫外周神经系统(PNS)的形成过程中,细胞粘附受体fasciclin II在运动神经元生长过程中的轴突成束和突触形成中起重要作用。在天蛾中,成束蛋白II(MFas II)表达为跨膜同种型(TM-MFas II)和糖基磷脂酰肌醇连接的同种型(GPI-MFas II)。通过使用RNA和抗体探针,我们已经表明,这两种亚型表达的非重叠模式:TM-MFas II是专门由神经元表达,并成为本地化到他们最能动的地区,而GPI-MFas II主要是由神经胶质细胞,包裹周围神经。这种表达的细胞类型特异性使我们能够监测PNS发展过程中神经元-神经胶质相互作用的性质。TM-MFas II阳性轴突在许多地区的生长之前,GPI-MFas II表达胶质细胞的过程,包围他们的到来。然而,在一些关键位置,GPI-MFas II阳性胶质细胞分化前的第一个轴突的到来,并预示着他们随后的轨迹。先前抑制GPI-MFas II表达破坏了随后在这些位置的轴突生长,但在PNS的其他地方没有。我们的研究结果表明,MFas II的两种亚型发挥不同的作用,细胞运动和神经形成。
During the formation of the insect peripheral nervous system (PNS), the cell adhesion receptor fasciclin II has been shown to play a prominent role in axonal fasciculation and synapse formation during motor neuron outgrowth. In the moth Manduca, fasciclin II (MFas II) is expressed both as a transmembrane isoform (TM-MFas II) and a glycosyl phosphatidylinositol-linked isoform (GPI-MFas II). By using RNA and antibody probes, we have shown that these two isoforms are expressed in nonoverlapping patterns: TM-MFas II is expressed exclusively by neurons and becomes localized to their most motile regions, while GPI-MFas II is expressed primarily by the glial cells that ensheath the peripheral nerves. This cell-type specificity of expression allowed us to monitor the nature of neuronal–glial interactions during PNS development. The outgrowth of TM-MFas II-positive axons in many regions preceded the arrival of GPI-MFas II-expressing glial processes that enwrapped them. In a few key locations, however, GPI-MFas II-positive glial cells differentiated before the arrival of the first axons and prefigured their subsequent trajectories. Prior inhibition of GPI-MFas II expression disrupted the subsequent outgrowth of axons at these locations but not elsewhere in the PNS. Our results suggest that the two isoforms of MFas II play distinct roles with respect to cellular motility and nerve formation.
发育中的哺乳动物大脑和脊髓中线的胶质细胞-神经元相互作用。
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