The effect of apolipoprotein E4 on synchronous neural interactions in brain cultures

• Published in: Experimental brain research 2015-06, Vol.233 (6), p.1977-1982
• Main Authors: Christopoulos, Vassilios, Georgopoulos, Angeliki, Georgopoulos, Apostolos P.
• Format: Article
• Language: English
• Subjects: Action Potentials - drug effects; Action Potentials - genetics; Alzheimer's disease; Analysis of Variance; Animals; Apolipoprotein E4 - genetics; Apolipoprotein E4 - pharmacology; Apolipoproteins; Biomedical and Life Sciences; Biomedicine; Brain; Cell Communication - drug effects; Cell culture; Cells, Cultured; Cerebral Cortex - cytology; Dose-Response Relationship, Drug; Electrodes; Embryo, Mammalian; Genotype; Human subjects; Humans; Lipoproteins; Lipoproteins - pharmacology; Medical research; Mice; Neural circuitry; Neural networks; Neuroblastoma; Neuroblastoma - pathology; Neurology; Neurons - drug effects; Neurons - physiology; Neurosciences; Physiological aspects; Plasma; Post traumatic stress disorder; Rats; Research Article; Veterans
• ISSN: 0014-4819; 1432-1106
• DOI: 10.1007/s00221-015-4270-4

In a previous study, we assessed the synchronous neural interactions (SNI) in a developing neural network in brain cultures on multielectrode arrays (Christopoulos et al. in J Neural Eng 9:046008, 2012 ). Here, we report on the effects of apolipoprotein E4 (apoE4) on these neural interactions. We carried out six experiments (five using rodent brain cultures and one using neuroblastoma cultures) in which we recorded local field potentials (LFP) from 59 sites for several days in vitro under the following conditions. In one experiment, we added to the culture media triglyceride (TG)-rich lipoproteins from a human subject with the apoE4/4 genotype, whereas in the other experiments, we added recombinant human apoE4. We found that SNI in the apoE4-treated cultures had higher coefficient of SNI variation, as compared to control cultures. These findings further document the role of SNI as a fundamental aspect of the dynamic organization of neural networks (Langheim et al. in Proc Natl Acad Sci USA 103:455–459, 2006 . doi: 10.1073/pnas.0509623102 ; Georgopoulos et al. in J Neural Eng 4:349–355, 2007 ) and extend the effect of apoE4 on SNI (Leuthold et al. in Exp Brain Res 226:525–536, 2013 ) across different brain species (human, rodents), apoE source (TG-rich lipoproteins, recombinant), neural signals (MEG, LFP), and brain network (intact brain, developing brain in vitro). To our knowledge, this is the first study of the effects of apoE4 on neural network function in vitro.