Zubarev, I. | Search bioRxiv

bioRxiv2020

Magnetocontrolled protein membranes for cell cultures co-cultivation

Investigation of cells and tissues in vitro systems is an attempt to simplify the very complex interactions between the various cell types from multicellular organisms. Monolayer cell cultures with single cell type do not allow to show all the possible paracrine interactions between various types of cells. To analyze intercellular inter-actions, it is possible to use systems that co-cultivate several cell types. This article proposes a new cell co-cultivation system based on levitation in the magnetic field in the culture medium of a magnetic protein membrane with cells. The developed system of co-cultivation of cells can be made in any laboratory of available reagents and have a low manufacturing cost.

bioengineering↗

bioRxiv2020

Heterogeneous somatostatin-expressing neuron population in mouse ventral tegmental area

The cellular architecture of the ventral tegmental area (VTA), the main hub of the brain reward system, remains only partially characterized. To extend the characterization to inhibitory neurons, we have identified three distinct subtypes of somatostatin (Sst)-expressing neurons in the mouse VTA. These neurons differ in their electrophysiological and morphological properties, anatomical localization, as well as mRNA expression profiles. Importantly, similar to cortical Sst-containing interneurons, most VTA Sst neurons express GABAergic inhibitory markers, but some of them also express glutamatergic excitatory markers and a subpopulation even express dopaminergic markers. Furthermore, only some of the proposed marker genes for cortical Sst neurons were expressed in the VTA Sst neurons. Physiologically, one of the VTA Sst neuron subtypes locally inhibited neighboring dopamine neurons. Overall, our results demonstrate the remarkable complexity and heterogeneity of VTA Sst neurons and suggest that these cells are multifunctional players in the midbrain reward circuitry.

neuroscience↗