Visualization of newly formed synapses with unprecedented resolution

Visualization of newly formed synapses with unprecedented resolution

The formation of excitatory and inhibitory synapses between neurons during early development gives rise to the neuronal networks that enable sensory and cognitive functions in humans. Inhibitory synapses decrease the likelihood of the firing action potential of a cell, while excitatory synapses increase its likelihood. Remarkably, both excitatory and inhibitory synapses are formed on dendrites of cortical neurons with high temporal and spatial precision, and it is believed that the spatial arrangement of synapses determines the functional consequences of excitation and inhibition of neuronal activities. However, studying the general mechanisms of synapse formation and distribution in dendrites has been challenging due to a lack of reliable methods that trigger and monitor synapse formation.

In their August publication in Science, MPFI researchers Won Chan Oh, Ph.D. and Hyung-Bae Kwon, Ph.D. describe how they precisely induced and visualized the formation of new synapses in real time in live animals. By using fine-scale optical techniques, they demonstrated that the local release of the , GABA, induces both inhibitory and excitatory synapse formation in the developing mouse cortex. The induction of synapses required signaling through GABAA receptors and voltage-gated calcium channels and the newly formed synaptic structures rapidly gain functions.

Future directions

The scientists optimized a spatiotemporally controlled method that induces and visualizes the formation of inhibitory and in cortical neurons in vitro and in vivo. According to Dr. Oh, these findings suggest a model in which GABA is the common molecule that sets the balance between inhibitory and excitatory synaptic contacts in early postnatal stages. "Given that abnormal synapse formation causes various neurodevelopmental diseases such as autism spectrum disorders and epilepsy, understanding activity-dependent mechanisms of initial will be important for developing new therapeutic strategies for these conditions," explained Dr. Kwon.

MPFI scientists optimized a spatiotemporally controlled method that induces and visualizes the formation of inhibitory and excitatory synapses in cortical neurons. Credit: Max Planck Florida Institute for Neuroscience

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Protein family linked to autism suppresses the development of inhibitory synapses

More information: Science, August 11 2016, DOI: 10.1126/science.aaf5206
Journal information: Science

Provided by Max Planck Society
Citation: Visualization of newly formed synapses with unprecedented resolution (2016, August 11) retrieved 16 June 2019 from https://medicalxpress.com/news/2016-08-visualization-newly-synapses-unprecedented-resolution.html
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