Two types of somatostatin-expressing GABAergic interneurons in the superficial layers of the mouse cingulate cortex

PloS One
Therese RiedemannBernd Sutor

Abstract

Somatostatin-expressing (SOM+), inhibitory interneurons represent a heterogeneous group of cells and given their remarkable diversity, classification of SOM+ interneurons remains a challenging task. Electrophysiological, morphological and neurochemical classes of SOM+ interneurons have been proposed in the past but it remains unclear as to what extent these classes are congruent. We performed whole-cell patch-clamp recordings from 127 GFP-labeled SOM+ interneurons ('GIN') of the superficial cingulate cortex with subsequent biocytin-filling and immunocytochemical labeling. Principal component analysis followed by k-means clustering predicted two putative subtypes of SOM+ interneurons, which we designated as group I and group II GIN. A key finding of our study is the fact that these electrophysiologically and morphologically distinct groups of SOM+ interneurons can be correlated with two neurochemical subtypes of SOM+ interneurons described recently in our laboratory. In particular, all SOM+ interneurons expressing calbindin but no calretinin could be classified as group I GIN, whereas all but one neuropeptide Y- and calretinin-positive interneurons were found in group II.

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Citations

Mar 9, 2019·The Journal of Comparative Neurology·Sophie RiedemannTherese Riedemann
Jun 11, 2019·Frontiers in Physiology·Maryam ArdalanCarina Mallard
Jun 20, 2019·International Journal of Molecular Sciences·Therese Riedemann
Mar 21, 2021·Experimental & Molecular Medicine·You-Hyang SongSeung-Hee Lee

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