Universität zu Köln

Radonjic, Nevena V., Ortega, Juan A., Memi, Fani, Dionne, Krista, Jakovcevski, Igor ORCID: 0000-0001-7673-9600 and Zecevic, Nada (2014). The complexity of the calretinin-expressing progenitors in the human cerebral cortex. Front. Neuroanat., 8. LAUSANNE: FRONTIERS MEDIA SA. ISSN 1662-5129

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Abstract

The complex structure and function of the cerebral cortex critically depend on the balance of excitation and inhibition provided by the pyramidal projection neurons and GABAergic interneurons, respectively. The calretinin-expressing (CaIR+) cell is a subtype of GABAergic cortical interneurons that is more prevalent in humans than in rodents. In rodents, CaIR+ interneurons originate in the caudal ganglionic eminence (CGE) from Gsx2(+) progenitors, but in humans it has been suggested that a subpopulation of CaIR+ cells can also be generated in the cortical ventricular/subventricular zone (VZ/SVZ). The progenitors for cortically generated CaIR+ subpopulation in primates are not yet characterized. Hence, the aim of this study was to identify patterns of expression of the transcription factors (TFs) that commit cortical stem cells to the CaIR fate, with a focus on Gsx2. First, we studied the expression of Gsx2 and its downstream effectors, Ascl1 and Sp8 in the cortical regions of the fetal human forebrain at midgestation. Next, we established that a subpopulation of cells expressing these TFs are proliferating in the cortical SVZ, and can be co-labeled with CalR. The presence and proliferation of Gsx2(+) cells, not only in the ventral telencephalon (GE) as previously reported, but also in the cerebral cortex suggests cortical origin of a subpopulation of CaIR+ neurons in humans. In vitro treatment of human cortical progenitors with Sonic hedgehog (Shh), an important morphogen in the specification of interneurons, decreased levels of Ascl1 and Sp8 proteins, but did not affect Gsx2 levels. Taken together, our ex-vivo and in vitro results on human fetal brain suggest complex endogenous and exogenous regulation of TFs implied in the specification of different subtypes of CaIR+ cortical interneurons.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Radonjic, Nevena V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ortega, Juan A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Memi, Fani UNSPECIFIED UNSPECIFIED UNSPECIFIED Dionne, Krista UNSPECIFIED UNSPECIFIED UNSPECIFIED Jakovcevski, Igor UNSPECIFIED orcid.org/0000-0001-7673-9600 UNSPECIFIED Zecevic, Nada UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-432006
DOI:	10.3389/fnana.2014.00082
Journal or Publication Title:	Front. Neuroanat.
Volume:	8
Date:	2014
Publisher:	FRONTIERS MEDIA SA
Place of Publication:	LAUSANNE
ISSN:	1662-5129
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CAUDAL GANGLIONIC EMINENCE; CALCIUM-BINDING PROTEINS; EARLY FETAL-DEVELOPMENT; CORTICAL INTERNEURONS; POSTNATAL-DEVELOPMENT; GABAERGIC NEURONS; NEOCORTICAL INTERNEURONS; SUBVENTRICULAR ZONE; PREFRONTAL CORTEX; CHANDELIER CELLS Multiple languages Anatomy & Morphology; Neurosciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43200