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The PROK2/PROKR2 signaling pathway is required for the migration of most olfactory bulb interneurons.

J Comp Neurol. 2019 Dec 15;527(18):2931-2947. doi:10.1002/cne.24719. Epub 2019 Jun 13
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摘要


Neural stem cells in the subventricular zone (SVZ) of the lateral ventricle generate new interneurons, which migrate tangentially through the rostral migratory stream (RMS) to the olfactory bulb (OB). The PROK2 (prokineticin 2) and PROKR2 (prokineticin receptor 2) signaling pathway has been identified to cause human Kallmann syndrome, a developmental disease that associates hypogonadism with anosmia (OB developmental defects). However, the identities and properties of PROK2+ and PROKR2+ cells in the SVZ-RMS-OB remain largely unknown. Here we examine the expression patterns of Prok2 and Prokr2 in the SVZ-RMS-OB using Prok2EGFP transgenic and Prokr2LacZ/+ knockin mice. Our results show that Prokr2 is expressed in postmitotic immature interneurons in the SVZ-RMS-OB. Prok2 is not expressed in the SVZ, but a few PROK2+ cells are found in the medial part of the RMS; they are not neural progenitors or migrating neuroblasts. In the OB, Prok2 is expressed in a subset of granule cells and tufted cells, but no coexpression of Prok2 and Prokr2 in the OB cells is observed. In Prok2 and Prokr2 mutant mice, severe tangential and radial migration defects of neuroblasts in the SVZ-RMS-OB result in loss of ~75% of GABAergic interneurons in the OB. These analyses demonstrate that PROK2/PROKR2 signaling is crucial for the tangential and radial migration of OB interneurons.

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