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Multiple origins of secretagogin expressing cortical GABAergic neuron precursors in the early human fetal telencephalon

Lookup NU author(s): Dr Ayman Alzu'bi, Dr Gavin Clowry

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Secretagogin (SCGN) which acts as a calcium signaling sensor, has previously been shown to be expressed by a substantial population of cortical GABAergic neurons at mid-gestation in humans but not in mice. The present study traced SCGN expression in cortical GABAergic neurons in human fetal forebrain from earlier stages than previously studied. Multiple potential origins of SCGN-expressing neurons were identified in the caudal ganglionic eminence (CGE) lateral ganglionic eminence (LGE) septum and preoptic area; these cells largely co-expressed SP8 but not the medial ganglionic eminence marker LHX6. They followed various migration routes to reach their target regions in the neocortex, insular and olfactory cortex (OC) and olfactory bulbs. A robust increase in the number of SCGN-expressing GABAergic cortical neurons was observed in the midgestational period; 58% of DLX2+ neurons expressed SCGN in the cortical wall at 19 post-conceptional weeks (PCW), a higher proportion than expressed calretinin, a marker for GABAergic neurons of LGE/CGE origin. Furthermore, although most SCGN+ neurons co-expressed calretinin in the cortical plate (CP) and deeper layers, in the marginal zone (MZ) SCGN+ and calretinin+ cells formed separate populations. In the adult mouse, it has previously been shown that in the rostral migratory stream (RMS), SCGN, annexin V (ANXA5), and matrix metalloprotease 2 (MMP2) are co-expressed forming a functioning complex that exocytoses MMP2 in response to calcium. In the present study, ANXA5 showed widespread expression throughout the cortical wall, although MMP2 expression was very largely limited to the CP. We found co-expression of these proteins in some SCGN+ neurons in the subventricular zones (SVZ) suggesting a limited role for these cells in remodeling the extracellular matrix, perhaps during cell migration.


Publication metadata

Author(s): Alzu'bi A, Clowry GJ

Publication type: Article

Publication status: Published

Journal: Frontiers in Neuroanatomy

Year: 2020

Volume: 14

Online publication date: 02/09/2020

Acceptance date: 10/08/2020

Date deposited: 26/10/2020

ISSN (electronic): 1662-5129

Publisher: Frontiers

URL: https://doi.org/10.3389/fnana.2020.00061

DOI: 10.3389/fnana.2020.00061


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