Interaction of nectin-2α with the auxiliary protein of the voltage-gated A-type K+ channel Kv4.2 dipeptidyl aminopeptidase-like protein at the boundary between the adjacent somata of clustered cholinergic neurons in the medial habenula

Publication date: Available online 5 November 2018Source: Molecular and Cellular NeuroscienceAuthor(s): Hajime Shiotani, Muneaki Miyata, Kiyohito Mizutani, Shujie Wang, Akira Mizoguchi, Hideki Mochizuki, Kenji Mandai, Yoshimi TakaiAbstractThe medial habenula (MHb) receives septal inputs and sends efferents to the interpeduncular nucleus and is implicated in stress, depression, memory, and nicotine withdrawal syndrome. We previously showed by immunofluorescence microscopy that the cell adhesion molecule nectin-2α is expressed in the cholinergic neurons in the developing and adult mouse MHbs and localized at the boundary between the adjacent somata of clustered cholinergic neurons where the voltage-gated A-type K+ channel Kv4.2 is localized. We further showed by immunoelectron microscopy that Kv4.2 is localized at the membrane specializations (MSs) whereas nectin-2α is localized mostly outside of these MSs. In addition, we showed that genetic ablation of nectin-2 delays the localization of Kv4.2 at the MSs in the developing MHb. We investigated here how nectin-2α regulates this localization of Kv4.2 at the MSs. In vitro biochemical analysis revealed that nectin-2α interacted with the auxiliary protein of Kv4.2 dipeptidyl aminopeptidase-like protein 6 (DPP6), but not with Kv4.2 or another auxiliary protein Kv channel interacting protein 1 (KChIP1). Immunofluorescence microscopy analysis showed that DPP6 was colocalized with nectin-2α at the boundary between the adjacent som...
Source: Molecular and Cellular Neuroscience - Category: Neuroscience Source Type: research