Name: modeling neuronal death and degeneration in mouse primary cerebellar granule neurons
Uploaded: 2017-11-06T16:30:00
Description: Watch this Scientific Journal Video about Modeling Neuronal Death and Degeneration in Mouse Primary Cerebellar Granule Neurons at JoVE.com

This work is supported by Natural Sciences and Engineering Research Council of Canada and the Canadian Institutes of Health Research grants to A.J.-A.

This protocol is based on modifications of procedures that have been described previously 18,24,25,26,27. This protocol is approved by the Animal Care Committee at McGill University.
1. Experimental Preparation
NOTE: The following stock solutions can be prepared and maintained until use.
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Here we provide a simple method for the culturing of primary mouse cerebellar granule neurons (CGNs), loss and gain of function studies, and modeling different mechanisms of cell death. Several factors affect the reproducibility of the results using this procedure which require close monitoring. These include the purity of the culture including the elimination of glial cells in the culture, the confluence of the culture, and maintaining healthy cells. Introducing variability in these factors can bias the results and chal...

Cerebellar granule neurons (CGNs) are well characterized in culture and have served as an effective model to study neuronal death and development 1,2,3,4,5,6. The early expression of N-methyl-D-aspartate (NMDA) receptors in CGN cultures in vitro makes them an attractive model to study NMDA-induced signalling. Activation of these receptors with NMDA in conjunction with membrane depolarization is used to model physiological neuronal activity stimulation, and has allowed for research into the mechanisms of synaptic plasticity 7,8. On the contrary, over-stimulation of these receptors by NMDA ligand can be used to model excitotoxicity, a major mechanism of neuronal loss in acute brain damage and neurodegenerative diseases 9. One mechanism for the induction of excitotoxicity is through ATP starvation with reduced oxygen, as seen with acute neuronal injury. This results in membrane depolarization and elevated levels of glutamate release at the synapse. The subsequent overstimulation of the NMDA receptor by elevated glutamate results in excessive Ca2+ influx via these receptors, which in turn activates several pathways including Ca2+-activated proteases, phospholipases, and endonucleases, resulting in the uncontrolled degradation of critical cellular components and cell death. Additionally, high intracellular Ca2+ leads to the generation of oxygen free radicals and mitochondrial damage 10,11.
While the majority of neuronal loss following NMDA-induced neuronal excitotoxicity is due to calcium influx and is Bax/Bak independent, other mechanisms of cell death cannot be excluded from this model. The appearance of both necrotic and apoptotic like cell death due to excitotoxicity is partially due to the generation of reactive oxygen species (ROS) and DNA damage caused by high intracellular Ca2+ levels 12. DNA damage results in neuronal death through apoptotic mechanisms, being correlated with hallmarks of apoptotic cell death, such as the appearance of chromatin masses and apoptotic bodies. Induction of apoptosis is mediated through the release of cytochrome c from the mitochondria, and has been shown to be dependent on Bax/Bak oligomerization 13. Bax/Bak oligomerization promotes pore formation in the outer mitochondrial membrane, resulting in cytochrome c release and the activation of pro-apoptotic regulators as seen with mild ischemic injury 14.
Generation of ROS is a significant issue in the brain due to the low endogenous levels of antioxidants, coupled with the large oxygen requirement for neuronal functioning 15. When exposed to an ischemic event, nitric oxide synthase is upregulated , producing nitric oxide and increasing reactive oxygen species 14. The increased concentration of oxygen radicals can result in DNA damage and indirectly cause energy starvation. High levels of DNA double-stranded breaks are remedied by the activation of poly ADP-ribose polymerase-1 (PARP-1), an eukaryotic chromatin-bound protein responsible for catalyzing the transfer of ADP-ribose units from NAD+, a process integral to DNA repair 16. However, with excessive damage due to oxidative stress, PARP-1 activation can cause energy starvation due to the increased drain on NAD+, a necessary substrate for ATP production through oxidative phosphorylation. Ultimately, oxidative stress will trigger apoptosis in a Bax/Bak dependant manner leading to mitochondrial cytochrome c release, and has been shown to induce mitochondrial remodelling in CGNs 17.
Finally, changes in concentration of potassium chloride (KCl) in CGN cultures can be used to model low potassium/depolarization mediated apoptosis 18,19,20. When exposed to low levels of K+, CGNs undergo distinct physiological changes, resulting in reductions of both mitochondrial respiration and glycolysis, attributed to decreased cellular demand 21, as well as reduction in levels of nuclear factor-&#954;B (NF&#954;B) which regulates activities including inflammation and synaptic transmission 22. This model is of particular interest for the study of cell death during neuronal development. The low K+ environment more closely resembles physiological conditions, and causes hallmarks of cell death seen during neuronal development 23.
In summary, CGNs provide a longstanding model to investigate the underlying molecular mechanisms of neuronal death and degeneration. The following protocol will allow isolation and culturing of CGNs, expression or repression of a particular genetic pathway using viruses and the induction of neuronal death via different mechanisms representing neuronal injury and degeneration.

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modeling neuronal death and degeneration in mouse primary cerebellar granule neurons

Cerebellar granule neurons (CGNs) are a commonly used neuronal model, forming an abundant homogeneous population in the cerebellum. In light of their post-natal development, abundance, and accessibility, CGNs are an ideal model to study neuronal processes, including neuronal development, neuronal migration, and physiological neuronal activity stimulation. In addition, CGN cultures provide an excellent model for studying different modes of cell death including excitotoxicity and apoptosis. Within a week in culture, CGNs express N-methyl-D-aspartate (NMDA) receptors, a specific ionotropic glutamate receptor with many critical functions in neuronal health and disease. The addition of low concentrations of NMDA in conjunction with membrane depolarization to rodent primary CGN cultures has been used to model physiological neuronal activity stimulation while the addition of high concentrations of NMDA can be employed to model excitotoxic neuronal injury. Here, a method of isolation and culturing of CGNs from 6 day old pups as well as genetic manipulation of CGNs by adenoviruses and lentiviruses are described. We also present optimized protocols on how to stimulate NMDA-induced excitotoxicity, low-potassium-induced apoptosis, oxidative stress and DNA damage following transduction of these neurons.

With careful dissection, the intact brain should be removed with minimal damage as seen in Figure 1A-B. Effort should be taken to minimize damage to the brain during removal, particularly damage to the cerebellum. Damaging the cerebellum makes for more difficult identification and complete removal of the meninges, and increases the likelihood of contamination of the neuronal culture. Once the meninges have been removed, the cerebellum can be ...

Watch this Scientific Journal Video about Modeling Neuronal Death and Degeneration in Mouse Primary Cerebellar Granule Neurons at JoVE.com

Modeling Neuronal Death and Degeneration in Mouse Primary Cerebellar Granule Neurons

This protocol describes a simple method for isolating and culturing primary mouse cerebral granule neurons (CGNs) from 6-7 day old pups, efficient transduction of CGNs for loss and gain of function studies, and modelling NMDA-induced neuronal excitotoxicity, low-potassium-induced cell death, DNA-damage, and oxidative stress using the same culture model.

Cerebellar granule neurons (CGNs) are a commonly used neuronal model, forming an abundant homogeneous population in the cerebellum. In light of their ...

The overall goal of this procedure is to produce healthy pure populations of cerebellar granule neurons and to genetically manipulate them and model different mechanisms of neuronal injury in the primary culture in vitro. This method can help answer key questions in the field of neuronal injury. We use this protocol to investigate the underlying molecular mechanisms of neural injuries following acute brain damage and neuro-generative diseases.The main advantage of this protocol is that we can model different mechanisms of cell death such as excitotoxicty, oxidative stress, DNA damage, and developmental event using the culture system. Although this method can provide insights into neuronal injury it can also be used with rat's cerebellar neurons to study neuronal activity and morphogenesis in response to growth factors and side events. To extract the brain of a six to seven day old mouse, use a pair of forceps to grasp a head, and with micro-dissection scissors, cut the skin anteriorly towards the head.Push back the skin to reveal the skull. Next, penetrate the skull with the tip of the scissors and cut anteriorly and laterally. Taking care not to damage the cerebellum, and facilitate identification and removal of meninges, then use forceps to peel back the skull exposing the brain.With a pair of forceps or spatula, gently tease out the brain into cool dissection solution. To isolate the cerebellum, place the brain in the dissection solution supplemented with magnesium sulfate and keep the solution and the brain on ice. Under the dissection microscope, remove the meninges by using fine forceps, then dissect out the cerebellum from the brain in magnesium sulfate supplemented dissection solution.This helps in peeling off the remaining meninges and allows one to go in between layers to clean the cerebellar folds. The presence of meninges is neuronal culture results in unhealthy cells and eventual cell death. As such, it's important to ensure complete removal of meninges before proceeding with culture.After that, turn the cerebellum to its ventral side and ensure the removal of the choroid plexus. Next, pull the cerebella into a 35 millimeter dish containing one milliliter of magnesium sulfate supplemented dissection solution. Chop the tissues into small pieces and transfer them into a 50 milliliter tube containing 30 milliliters of magnesium sulfate buffered dissection solution.In this step, centrifuge the 15 milliliter tube containing the chopped cerebral tissue for five minutes at 644 times g, and four degrees Celsius. After that remove the supernatant, and add 10 milliliters of trypsin dissection solution. Then shake the table at high speed for 15 minutes at 37 degrees Celsius.Add two milliliters of trypsin inhibitor solution one to the tube and rock gently for two minutes. Subsequently, centrifuge the tube for five minutes at 644 times g and four degrees Celsius. After five minutes, remove the supernatant, and add two milliliters of trypsin inhibitors solution two before transferring it to a 15 milliliter tube.Then triturate the tissue in the 15 milliliter tube until the solution becomes murky. Let it settle for five minutes. Then remove the clear supernatant and transfer it to a new tube containing one milliliter of calcium chloride supplemented dissection solution.Add another two milliliters of trypsin inhibitor solution two to the bottom of the tube containing the pellet. Triturate it again and let it settle for five minutes. Remove the supernatant and add it to the tube containing supernatant from the previous step.Repeat this process until most of the tissue is mechanically dissociated. Add 0.3 milliliters of calcium chloride supplemented dissection solution to the supernatant collection for every milliliter of supernatant. Mix the contents of the tube and then centrifuged for five minutes at 644 times G at room temperature.Following that, remove the supernatant. Add 10 milliliters of fresh media to the pellet and mix. Then count the live cells and dilute them to a concentration of 1.5 times 10 to the six cells per milliliter.Plate the cells on the previously prepared poly D-lysine plates. For four well plates, plate 0.5 millimiters of the sample giving 7.5 times 10 to the fifth cells per well. For 35 millimeter dishes, plate four milliliters of the sample, giving six times 10 to the sixth cells per plate.For cover slips, plate 0.5 milliliters giving 7.5 times 10 to the fifth cells per well. After 24 hours, add AraC to the plates to reduce glial contamination. If the cells are to be maintained for seven to eight days, repeat this treatment on day three and maintain the cultures in a 5%CO2 incubator at 37 degrees celsius.For the cultures maintained longer than five days feed the culture with glucose every two days starting on day five. To induce neuronal excitotoxicity with NMDA, following seven days in vitro, treat the cerebellar granule neurons with 100 micromolar NMDA and 10 micromolar glycine for one hour. Then, replace the medium with conditioned medium from the parallel cultures with no treatment.This concentration results in 50%cell death at 24 hours post treatment. For ROS induced cell death, treat the neurons with hydrogen peroxide at 75 to 100 micromolar for five minutes. After five minutes, switch it to the conditioned media from parallel cultures.Due to the instability of hydrogen peroxide, the concentration must be optimized to a level that induces between 50 and 70%cell death after 24 hours. This concentration in usually between 75 and 100 micromolar. To induce cell death by DNA damage, treat the cerebellar granule neurons with 10 micromolar camptothecin to induce more than 50%cell death within 24 hours.For low potassium induced neuronal apoptosis in cerebellar granule neurons, change the media containing 25 millimolar potassium to low potassium medium with five millimolar potassium following seven days in vitro. Neurons were transduced with lentivirus for RFP at MOI of three at the time of plating. Fixed and stained at seven days in vitro.The co-localization of RFP signal MAP2 and Hoechst is shown to demonstrate healthy neurons that are fully transduced by lentiviruses. The images shown here represent live-dead assay analyses of neurons infected with different MOI of adenovirus to measure toxicity. Cerebellar granule neurons infected with adenovirus expressing LacZ at an MOI between 25 and 50 allows for maximal efficiency while maintaining minimal toxicity.Less than a 1%difference in cell survival compared to control is seen when infecting at this MOI. These figures show the Hoechst staining of control cerebellar granule neurons and cerebellar granule neurons treated with NMDA to induce cell death. Note the formation of pyknotic nuclei with NMDA treatment.This is an indication of cell death and can be seen in approximately 50%of the culture 24 hours after treatment with 100 micromolar NMDA and 10 micromolar glycine. Once mastered, this technique can be performed in two and a half hours with six mouse pops, if performed properly. When performing this technique, it's important to use aseptic technique and chained surgical instruments as required in order to minimize risk of culture contamination.After its development, this technique paved the way for researchers in the field of neuroscience to study neuronal development and neuronal injury in primary mouse neurons. After watching this video, you should be able to culture cerebellar granular neurons, genetically manipulate them using viruses and induce varying mechanisms of neural injury. Following this procedure, other methods like immunofluorescence or cell viability assays can be performed to answer questions like whether a gene of interest enhances cell survival in response to excitotoxicity, oxidative stress, or DNA damage.

Research

JoVE Journal

Neuroscience

In utero Electroporation followed by Primary Neuronal Culture for Studying Gene Function in Subset of Cortical Neurons

In utero Electroporation followed by Primary Neuronal Culture for Studying Gene Function in Subset of Cortical Neurons

In vitro study of primary neuronal cultures allows for quantitative analyses of neurite outgrowth. In order to study how genetic alterations affect ...

Nucleofection and Primary Culture of Embryonic Mouse Hippocampal and Cortical Neurons

Hippocampal and cortical neurons have been used extensively to study central nervous system (CNS) neuronal polarization, axon/dendrite outgrowth, and ...

Quantitative Analysis of Synaptic Vesicle Pool Replenishment in Cultured Cerebellar Granule Neurons using FM Dyes

After neurotransmitter release in central nerve terminals, SVs are rapidly retrieved by endocytosis.  Retrieved SVs are then refilled with ...

Genetic Manipulation of Cerebellar Granule Neurons In Vitro and In Vivo to Study Neuronal Morphology and Migration

Genetic Manipulation of Cerebellar Granule Neurons In Vitro and In Vivo to Study Neuronal Morphology and Migration

Developmental events in the brain including neuronal morphogenesis and migration are highly orchestrated processes. In vitro and in vivo analyses allow ...

Primary Culture of Mouse Dopaminergic Neurons

Dopaminergic neurons represent less than 1% of the total number of neurons in the brain. This low amount of neurons regulates important brain functions ...

Ex Vivo Imaging of Postnatal Cerebellar Granule Cell Migration Using Confocal Macroscopy

Ex Vivo Imaging of Postnatal Cerebellar Granule Cell Migration Using Confocal Macroscopy

During postnatal development, immature granule cells (excitatory interneurons) exhibit tangential migration in the external granular layer, and then ...

Selective Depletion of Microglia from Cerebellar Granule Cell Cultures Using L-leucine Methyl Ester

Microglia, the resident immunocompetent cells of the CNS, play multifaceted roles in modulating and controlling neuronal function, as well as mediating ...

Assessment of Neuronal Viability Using Fluorescein Diacetate-Propidium Iodide Double Staining in Cerebellar Granule Neuron Culture

Primary cultured Cerebellar Granule Neurons (CGNs) have been widely used as an in vitro model in neuroscience and neuropharmacology research. However, the ...

Modeling Charcot-Marie-Tooth Disease In Vitro by Transfecting Mouse Primary Motoneurons

Modeling Charcot-Marie-Tooth Disease In Vitro by Transfecting Mouse Primary Motoneurons

Neurodegeneration of spinal motoneurons (MNs) is implicated in a large spectrum of neurological disorders including amyotrophic lateral sclerosis, ...

Ballistic Labeling of Pyramidal Neurons in Brain Slices and in Primary Cell Culture

It has been reported that the size and shape of dendritic spines is related to their structural plasticity. To identify the morphological structure of ...