Press

2019.10.25
NEW

Arm movements induced by noninvasive optogenetic stimulation of the motor cortex in the common marmoset

We improved a method of optogenetic cortical stimulation and induced overt forelimb movements in the common marmoset, a New World monkey. Our results open doors for noninvasive interrogation of motor circuits in behaving nonhuman primates to address which brain area drives hand/arm movements after learning or brain injury.

2019.09.24

A Bayesian psychophysics model of sense of agency

Sense of agency (SoA) refers to the experience that one's own actions caused an external event. Here, the authors present a model of SoA in terms of optimal Bayesian cue integration taking into account reliability of action and outcome sensory signals and judging if the action caused the outcome.

2019.08.20

Parkinson’s disease is a type of amyloidosis featuring accumulation of amyloid fibrils of α-synuclein

We confirmed, for the first time, that Lewy bodies contained amyloid fibrils using autopsied brains of Parkinson's disease patients. Collaborative research with the large-scale synchrotron radiation facility, SPring-8, enabled ultrastructural analysis of aggregates in brain sections. These new findings are expected to be applied to the development of diagnostic and therapeutic approaches for Parkinson's disease.

2019.06.13

Alzheimer’s disease protein links plaques to cell death in mice

A new protein involved in Alzheimer’s disease (AD) has been identified by researchers at the RIKEN Center for Brain Science (CBS). CAPON may facilitate the connection between the two most well-known AD culprits, amyloid plaques and tau pathology, whose interactions cause brain cell death and symptoms of dementia. This latest finding from the Takaomi Saido group at RIKEN CBS uses a novel mouse model of AD.
The study was published in Nature Communications on June 3.

2019.06.13

Rational Engineering of XCaMPs, a Multicolor GECI Suite for In Vivo Imaging of Complex Brain Circuit Dynamics

We here developed a multicolor GECI suite, "XCaMP", which enables to image high-frequency firing patterns, non-invasively measure hippocampal CA1 dynamics, and simultaneously record pre- and postsynaptic firing, or co-image neuronal activities in 4 distinct celltypes. XCaMPs will be useful for elucidating complex brain circuit dynamics in health and neuropsychiatric diseases.

2018.09.03

Super-wide-field two-photon imaging with a micro-optical device moving in post-objective space

Recording the activity of neurons over large brain regions requires expanding the field of view of the optics without losing on spatial and temporal resolution. Here, this team reports a micro-opto-mechanical device that enables two-photon imaging across distant cortical areas around 6 mm apart in the mouse.

DOI: 10.1038/s41467-018-06058-8

2018.08.24

Monitoring and Updating of Action Selection for Goal-Directed Behavior through the Striatal Direct and Indirect Pathways

It remains unclear how direct and indirect pathways of the basal ganglia signal functional information for a goal-directed adaptive behavior. Combining electrophysiology and optogenetics in behaving rats, we found the direct pathway neurons reselect the same action after reward outcome, whereas indirect pathway neurons switch to the other action after no-reward outcome.

2018.08.22

Calcium Transient Dynamics of Neural Ensembles in the Primary Motor Cortex of Naturally Behaving Monkeys

The research team led by Hideyuki Okano and Junichi Ushiba (Keio University) demonstrate calcium imaging from neuronal populations using a miniature fluorescence microscope in naturally behaving non-human primates (NHPs), common marmosets. This technique marks an advance beyond methods using fixed head positioning, which limits the study of complex, self-determined behaviors such as social interactions or fear/anxiety.

2018.08.16

Ser46-Phosphorylated MARCKS Is a Marker of Neurite Degeneration at the Pre-Aggregation Stage in PD/DLB Pathology

MARCKS Phosphorylation at Ser46 reflects neurite degeneration and is a candidate marker for presymptomatic and preaggretaion pathology of Alzheimer’s disease. Here, we demonstrate the similar change in Parkinson’s disease and Dementia with Lewy body prior to alpha-synuclein aggregation, and suggest an ultra-early stage pathology shared by different groups of neurodegenerative diseases.
DOI: https://doi.org/10.1523/ENEURO.0217-18.2018

2018.07.30

Anatomical templates of the midbrain ventral tegmental area and
substantia nigra for Asian populations

The ventral tegmental area (VTA) and substantia nigra (SN) are involved in dopaminergic brain functions. Given that there are no VTA or SN anatomical MRI templates for Asian people, we created these templates and showed suitability for Asian brains using anatomical and resting state functional MRI data.

2018.07.19

Single-cell trajectory analysis of human homogenous neurons carrying a rare RELN variant

The research team led by Profs. Norio Ozaki (Nagoya University) and Hideyuki Okano (Keio University) revealed that a rare RELN variant, initially identified in a schizophrenic patient, causes a loss of directional stability during neuronal migration using human iPSCs generated from the patient. These findings are expected to contribute to understanding the molecular pathophysiology and/or developing drugs for mental disorders.

Authors;
Arioka Y, Shishido E, Kubo H, Kushima I, Yoshimi A, Kimura H, Ishizuka K, Aleksic B, Maeda T, Ishikawa M, Kuzumaki N, Okano H, Mori D, Ozaki N: Single-cell trajectory analysis of human homogenous neurons carrying a rare RELN variant. Transl Psychiatry 8 (1):129, 2018

2018.06.28

Intellectual deterioration may play a key role in work disturbances in patients with schizophrenia.(in Japanese only)

Intellectual deterioration may play a key role in work disturbances in patients with schizophrenia. The study demonstrated probabilistic models to estimate work status in patients with schizophrenia based on relevant factors including intellectual deterioration. Feedback on work status would support social rehabilitation in patients with schizophrenia.

2018.06.08

Tau steal the motivation in patients with Alzheimer’s disease.

The present study demonstrated that tau pathology in orbitofrontal cortex (OFC) may provoke focal neurotoxicity in OFC and the following disruption of the OFC-uncinate fasciculus network, leading to the emergence and progression of apathy in Alzheimer’s disease. The current data also raise the possibility that emerging antitau drugs would be efficacious for suppressing apathy.

2018.06.04

In vivo wide-field calcium imaging of mouse thalamocortical synapses
with an 8K ultra-high-definition camera

By combining an 8K ultra-high-definition camera with spinning-disk one-photon confocal microscopy, we succeeded in imaging of activity of presynaptic axonal boutons of neurons projecting to the motor cortex in a behaving mouse. We detected axonal boutons with highly correlated activity over the 1 mm2 field.

2018.05.07

A spherical aberration-free microscopy system for live brain imaging

This article was published in "Biochemical and Biophysical Research Communications, Volume 500, Issue 2".

2018.04.06

CRMP2-binding compound, edonerpic maleate, accelerates motor function recovery from brain damage

Brain damage such as stroke is a devastating neurological condition, which may severely compromise patient quality of life. No effective medication-mediated intervention to accelerate rehabilitation has been established. We found that a small compound, edonerpic-maleate, facilitated experience-driven synaptic glutamate AMPAreceptor delivery and resulted in the acceleration of motor function recovery after brain damage in a training-dependent manner.

2018.02.23

Single-cell bioluminescence imaging of deep tissue in freely moving animals.

Bioluminescence is a natural light source based on luciferase catalysis of its substrate luciferin. We performed directed evolution on firefly luciferase using a red-shifted and highly deliverable luciferin analog to establish AkaBLI, an all-engineered bioluminescence in vivo imaging system.
This research result was published in "Science 23 Feb 2018".

2018.01.30

Targeting Tyro3 ameliorates a model of PGRN-mutant FTLD-TDP via tau-mediated synaptic pathology.

Mutations in the progranulin (PGRN) gene cause a tau pathology-negative and TDP43 pathology-positive form of frontotemporal lobar degeneration (FTLD-TDP). We generated a knock-in mouse harboring the R504X mutation (PGRN-KI).
This research result was published on Nature Communications, 30 January 2018.

2018.01.19

Role of subcortical structures on cognitive and social function in schizophrenia

Subcortical regions have a pivotal role in cognitive, affective, and social functions in humans, and the structural and functional abnormalities of the regions have been associated with various psychiatric disorders.
This research result was published on Scientific Reports, volume 8, 19 January 2018.

2016.03.22

Press Release Calcium imaging reveals glial involvement in transcranial direct current stimulation-induced plasticity in mouse brain

Researchers at the RIKEN Brain Science Institute and collaborative project have discovered that the benefits of stimulating the brain with direct current come from its effects on astrocytes — not neurons — in the mouse brain. Published in Nature Communications, the work shows that applying direct current to the head releases synchronized waves of calcium from astrocytes that can reduce depressive symptoms and lead to a general increase in neural plasticity — the ability of neuronal connections to change when we try to learn or form memories.

2016.02.09

Press Release Territories of heterologous inputs onto Purkinje cell dendrites are segregated by mGluR1-dependent parallel fiber synapse elimination

In cerebellar Purkinje cells (PCs), dendritic territories by climbing and parallel fiber (PF) innervations are segregated. Here, we show that the segregation of territories occurs as a result of elimination of PF synapses from the proximal dendrites, and that PF synapse elimination is controlled by the type 1 metabotropic glutamate receptor to protein kinase Cg signaling pathway in PCs.

2015.12.10

Press Release Mirror Neurons in a New World Monkey, Common Marmoset

The research team including researchers from NCNP and RIKEN BSI found neurons in the ventrolateral frontal cortex with characteristic “mirror” properties quite similar to those in macaques. This finding suggests that mirror neurons occur in a common ancestor of New and Old World monkeys and its common properties are preserved during the course of primate evolution.

2015.11.20

Press Release Long-term two-photon calcium imaging of neuronal populations with subcellular resolution in adult non-human primate

Researchers at the RIKEN Brain Science Institute in Japan have developed a new system for imaging the activity of individual neurons in the marmoset brain. Published in Cell Reports, the study shows how amplifying genetically encoded fluorescent signals with TET-inducible gene expression allows hundreds of individual neurons in the primate brain to be imaged simultaneously over a period of several months.

2015.10.06

Press Release Two-photon fluorescence lifetime imaging of primed SNARE complexes in presynaptic terminals and β cells

It remains unclear how readiness for Ca2+ -dependent exocytosis depends on varying degrees of SNARE complex assembly. We demonstrated the SNARE assembly using fluorescence lifetime imaging (FLIM) of Forster resonance energy transfer (FRET) between three pairs of neuronal SNAREs in presynaptic boutons and pancreatic beta cells in the islets of Langerhans.

2015.09.15

Press Release In vivo two-photon imaging of dendritic spines in marmoset neocortex

The research team including researchers from RIKEN BSI and NIPS established a new method to visualize dendritic spines in the living marmoset brain. The method that utilizes two-photon microscopy in combination with virus vectors to enhance the expression of fluorescent signals makes it possible to study neural circuits in primate brains.

2015.09.15

Press Release Real x-ray vision: see-through brains ready for study

Researchers at the RIKEN Brain Science Institute in Japan have developed a new technique for creating transparent tissue that can be used to illuminate 3D brain anatomy at very high resolutions. Published in Nature Neuroscience, the work showcases the new technology and its practical importance in clinical science by showing how it has given new insights into Alzheimer’s disease plaques.

2015.07.14

Fasting activates macroautophagy in neurons of Alzheimer’s disease mouse model but is insufficient to degrade amyloid-beta
Hitoshi Okazawa

The research team led by Prof. Okazawa (Tokyo Medical and Dental University) developed a new technique for observation
of autophagy in the brain in vivo, and revealed unexpected roles of autophagy in Alzheimer's disease
including the increase of intracellular Amyloid beta by starvation and circadian rhythm of neuronal autophagy activity.

2015.05.06
2015.04.06

Brain/MINDS: brain-mapping project in Japan- Philosophical Transactions B
Hideyuki Okano, Atsushi Miyawaki, Kiyoto Kasai

2014.09.27