TY - JOUR
T1 - Abnormalities in cortical interneuron subtypes in ephrin-B mutant mice
AU - Talebian, Asghar
AU - Britton, Rachel
AU - Henkemeyer, Mark
N1 - Funding Information:
We thank the following for providing/generating specific mouse lines: Philippe Soriano and Alice Davy for Efnb1loxP, David Anderson for Efnb2loxP, John Rubenstein for Dlx1/2. Cre (I12b), Hongkui Zeng for Rosa26-STOP-tdTomato (Ai9), Nobuaki Tamamaki for GAD67-GFP and Gábor Szabó for GAD65-GFP. We also thank Francis Sprouse for help with genotyping and cardiac perfusions. This research was supported by the NIH (MH066332) to M.H.
Publisher Copyright:
© 2018 Federation of European Neuroscience Societies and John Wiley & Sons Ltd
PY - 2018/7
Y1 - 2018/7
N2 - To explore roles for ephrin-B/EphB signaling in cortical interneurons, we previously generated ephrin-B (Efnb1/b2/b3) conditional triple mutant (TMlz) mice using a Dlx1/2.Cre inhibitory neuron driver and green fluorescent protein (GFP) reporters for the two main inhibitory interneuron groups distinguished by expression of either glutamic acid decarboxylase 1 (GAD1; GAD67-GFP) or 2 (GAD2; GAD65-GFP). This work showed a general involvement of ephrin-B in migration and population of interneurons into the embryonic neocortex. We now determined whether specific interneurons are selectively affected in the adult brains of TMlz.Cre mice by immunostaining with antibodies that identify the different subtypes. The results indicate that GAD67-GFP-expressing interneurons that also express parvalbumin (PV), calretinin (CR) and, to a lesser extent, somatostatin (SST) and Reelin (Rln) were significantly reduced in the cortex and hippocampal CA1 region in TMlz.Cre mutant mice. Neuropeptide Y (NPY) interneurons that also express GAD67-GFP were reduced in the hippocampal CA1 region, but much less so in the cortex, although these cells exhibited abnormal cortical layering. In GAD65-GFP-expressing interneurons, CR subtypes were reduced in both cortex and hippocampal CA1 region, whereas Rln interneurons were reduced exclusively in hippocampus, and the numbers of NPY and vasoactive intestinal polypeptide (VIP) subtypes appeared normal. PV and CR subtype interneurons in TMlz.Cre mice also exhibited reductions in their perisomatic area, suggesting abnormalities in dendritic/axonal complexity. Altogether, our data indicate that ephrin-B expression within forebrain interneurons is required in specific subtypes for their normal population, cortical layering and elaboration of cell processes.
AB - To explore roles for ephrin-B/EphB signaling in cortical interneurons, we previously generated ephrin-B (Efnb1/b2/b3) conditional triple mutant (TMlz) mice using a Dlx1/2.Cre inhibitory neuron driver and green fluorescent protein (GFP) reporters for the two main inhibitory interneuron groups distinguished by expression of either glutamic acid decarboxylase 1 (GAD1; GAD67-GFP) or 2 (GAD2; GAD65-GFP). This work showed a general involvement of ephrin-B in migration and population of interneurons into the embryonic neocortex. We now determined whether specific interneurons are selectively affected in the adult brains of TMlz.Cre mice by immunostaining with antibodies that identify the different subtypes. The results indicate that GAD67-GFP-expressing interneurons that also express parvalbumin (PV), calretinin (CR) and, to a lesser extent, somatostatin (SST) and Reelin (Rln) were significantly reduced in the cortex and hippocampal CA1 region in TMlz.Cre mutant mice. Neuropeptide Y (NPY) interneurons that also express GAD67-GFP were reduced in the hippocampal CA1 region, but much less so in the cortex, although these cells exhibited abnormal cortical layering. In GAD65-GFP-expressing interneurons, CR subtypes were reduced in both cortex and hippocampal CA1 region, whereas Rln interneurons were reduced exclusively in hippocampus, and the numbers of NPY and vasoactive intestinal polypeptide (VIP) subtypes appeared normal. PV and CR subtype interneurons in TMlz.Cre mice also exhibited reductions in their perisomatic area, suggesting abnormalities in dendritic/axonal complexity. Altogether, our data indicate that ephrin-B expression within forebrain interneurons is required in specific subtypes for their normal population, cortical layering and elaboration of cell processes.
KW - CA1
KW - Eph-Ephrin bidirectional signaling
KW - cortex
KW - hippocampus
KW - interneuron subtypes
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U2 - 10.1111/ejn.14022
DO - 10.1111/ejn.14022
M3 - Article
C2 - 29904965
AN - SCOPUS:85050869006
SN - 0953-816X
VL - 48
SP - 1803
EP - 1817
JO - European Journal of Neuroscience
JF - European Journal of Neuroscience
IS - 2
ER -