The N-ethylmaleimide-sensitive factor and dysbindin interact to modulate synaptic plasticity

• Published in: The Journal of neuroscience 2015-05, Vol.35 (19), p.7643-7653
• Main Authors: Gokhale, Avanti, Mullin, Ariana P, Zlatic, Stephanie A, Easley, 4th, Charles A, Merritt, Megan E, Raj, Nisha, Larimore, Jennifer, Gordon, David E, Peden, Andrew A, Sanyal, Subhabrata, Faundez, Victor
• Format: Article
• Language: English
• Subjects: Animals; Animals, Genetically Modified; Cell Line, Tumor; Drosophila; Drosophila Proteins - genetics; Drosophila Proteins - metabolism; Dysbindin; Dystrophin-Associated Proteins - genetics; Dystrophin-Associated Proteins - metabolism; Gene Expression Regulation - genetics; Gene Expression Regulation - physiology; Humans; Melanoma - pathology; N-Ethylmaleimide-Sensitive Proteins - genetics; N-Ethylmaleimide-Sensitive Proteins - metabolism; Nerve Net - physiology; Nerve Tissue Proteins - genetics; Nerve Tissue Proteins - metabolism; Neuroblastoma - pathology; Neuromuscular Junction - genetics; Neuromuscular Junction - metabolism; Neuronal Plasticity - drug effects; Neuronal Plasticity - genetics; Neuronal Plasticity - physiology; SNARE Proteins - metabolism; Synapses - genetics; Synapses - physiology; Synaptic Vesicles - genetics; Synaptic Vesicles - metabolism
• ISSN: 0270-6474; 1529-2401
• DOI: 10.1523/JNEUROSCI.4724-14.2015

Dysbindin is a schizophrenia susceptibility factor and subunit of the biogenesis of lysosome-related organelles complex 1 (BLOC-1) required for lysosome-related organelle biogenesis, and in neurons, synaptic vesicle assembly, neurotransmission, and plasticity. Protein networks, or interactomes, downstream of dysbindin/BLOC-1 remain partially explored despite their potential to illuminate neurodevelopmental disorder mechanisms. Here, we conducted a proteome-wide search for polypeptides whose cellular content is sensitive to dysbindin/BLOC-1 loss of function. We identified components of the vesicle fusion machinery as factors downregulated in dysbindin/BLOC-1 deficiency in neuroectodermal cells and iPSC-derived human neurons, among them the N-ethylmaleimide-sensitive factor (NSF). Human dysbindin/BLOC-1 coprecipitates with NSF and vice versa, and both proteins colocalized in a Drosophila model synapse. To test the hypothesis that NSF and dysbindin/BLOC-1 participate in a pathway-regulating synaptic function, we examined the role for NSF in dysbindin/BLOC-1-dependent synaptic homeostatic plasticity in Drosophila. As previously described, we found that mutations in dysbindin precluded homeostatic synaptic plasticity elicited by acute blockage of postsynaptic receptors. This dysbindin mutant phenotype is fully rescued by presynaptic expression of either dysbindin or Drosophila NSF. However, neither reduction of NSF alone or in combination with dysbindin haploinsufficiency impaired homeostatic synaptic plasticity. Our results demonstrate that dysbindin/BLOC-1 expression defects result in altered cellular content of proteins of the vesicle fusion apparatus and therefore influence synaptic plasticity.