Congratulation to all
participants of the symposium for giving great presentation, with special congratulations
to the winners:
1st place: Marko
Ilievski
2nd place: Rachael
Chan
3rd place: Zach
Wanner
Honourable mention: Hannah
Scott
Abstracts
PATERNAL HEALTH
AND DEVELOPMENT
1.
The effect of preconception paternal alcohol
consumption on offspring social play
Corbin Chenger, Allona Harker, Sarah Raza, Robbin Gibb
The
effects of maternal experience on offspring development are well known. However, there is less awareness on the
effects of preconception paternal experience. Most people are aware of
quantitative effects on sperm in terms of fertility, but few are aware of
qualitative effects that likely occur through epigenetic mechanisms. Recent
research in our lab has shown that paternal alcohol does affect neuroanatomy
and behavior. As such, we decided to analyze play behavior in rats sired by
alcohol-exposed fathers. The findings from this study could be utilized to communicate
the importance of preconception paternal health.
2.
Paternal exposure to fluoxetine: Effects on brain, behavior, and the
epigenome of offspring
Ana J.C. Carvalho, Allona Harker, Brian Kolb, Robbin
Gibb
Fluoxetine (SSRI) is one of the most prescribed antidepressants
in the world. Recent studies have shown the influence of fluoxetine in the
spermatogenesis of adult male rats, which may lead to reproductive problems. Recently,
paternal preconception experience is a topic that has been in the spotlight, as
paternal genes have been shown to greatly influence placenta formation. This
study proposes to examine the effects of father exposure to fluoxetine on the
epigenetic, anatomical, and functional outcomes of the offspring.
3.
Stereological analysis of brain tissue derived from animals with preconception
exposure to alcohol
Lindsay Amatto, Marisa Lelekach, Allonna Harker, Sarah
Raza, Bryan Kolb, Robbin Gibb
The effect of maternal experience on the prenatal
environment is well researched. However, comprehensive examination of father
experience is lacking. We examined the effects of paternal preconception
alcohol exposure on their offspring through stereological analysis of the AID
and Cg3 areas of the prefrontal cortex. We determined that significant
differences were noted in the AID areas but no significant findings were
observed in the Cg3 areas. These results suggest that paternal alcohol exposure
alters brain anatomy in offspring.
TRANSGENERATIONAL
PROGRAMMING and NEURODEVELOPMENT
4.
Maternal inflammation and prenatal stress: Allostatic load
during pregnancy may program offspring behaviour
Amanda Weiler, J. Keiko
McCreary, Erin A. Falkenberg, Ashlee Matkin, Janet Poplawski, David M. Olson,
Gerlinde A.S. Metz
Activation of the
maternal immune system and psychological stress during pregnancy both can cause
long-term health outcomes in offspring. We hypothesized that combined immune
and psychological stressors represent two “hits” and synergistically increase
allostatic load and behavioural impairments in offspring. Adult female rats
were stressed on gestational days 12 to 18 and administered IL-1B daily from
gestational day 17 until delivery. Offspring from different treatment groups
(no stress/saline; no stress/IL-1B; stress/saline; stress/IL-1B) were tested in
sensorimotor tasks. Prenatal stress and IL-1B treatments caused delays in
sensorimotor development. Offspring born to stress/IL-1B mothers displayed the
most severe. The observations support the two-hit hypothesis in the offspring
and reflect cumulative allostatic load by combined maternal immune and
psychological stress. The results provide insights into possible causes of
neurodevelopmental disorders.
5.
Enriched environment reduces allostatic load caused by
ancestral stress
Teddi Reynolds, J.
Keiko McCreary, Gerlinde A.S. Metz
Allostatic load
(AL) is the cumulative burden of stress. AL is manifested in the physiological
dysregulation across multiple systems that are involved in coping with stress.
Here we developed an allostatic load index (AI) as a method to visualize the
extent of stress-induced dysregulation across multiple systems. We used the AI
to quantify the physiological burden caused by ancestral stress in rats, and we
determined that enriched environment can offset the adverse health outcomes
linked to AL. The use of an AI may represent a clinically valid method to
evaluate biomarkers of chronic stress and to predict stress-associated disease
risk.
6.
Testing the “two-hit” hypothesis: Do stress and inflammation
result in a synergistic effect on maternal health outcomes?
Janet Poplawski,
J. Keiko McCreary, Erin A. Falkenberg, Ashlee Matkin, Amanda Weiler, David M.
Olson, Gerlinde A.S. Metz
Exposure to stress during pregnancy can lead to
negative maternal health outcomes. Studies have linked prenatal stress to
increased risk of preterm birth, gestational diabetes, and maladaptive maternal
behaviours. However, little is known about the effects of allostatic load (AL),
or multiple hits by stress, on maternal health. In this study, pregnant rats
were exposed to multiple stressors to determine whether gestational AL had
synergistic effects on maternal health and pregnancy outcomes. We found that while
AL induced certain physiological changes, others were associated with specific
types of stress. This research provides insights into risk factors of adverse
maternal health.
7.
Like great-grandmother, like daughter: Mechanisms that promote stress resilience
across generations
Hannah Scott, J. Keiko McCreary, Zachary
T. Erickson, Gerlinde A.S. Metz
Transgenerational prenatal stress has been found to
affect the behaviour and health of an individual. This project examined the
effects of ancestral prenatal stress (APS) on adult hippocampal neurogenesis
and functionality in the F4 generation. The protein brain-derived neurotrophic
factor (BDNF) was chosen as an indicator of hippocampal plasticity, and was
examined via Western blotting. Hippocampal integrity was evaluated by tests of
learning and memory, including the water maze task. Although no effects of
transgenerational stress on learning and memory were found, the results
revealed that APS increased BDNF expression. These findings suggest transgenerationally
programmed compensatory mechanisms to promote neural plasticity.
DISEASE MODELS, STRESS and ADDICTION
8.
Prenatal exposure to a ‘double dose’ of valproic acid alters dendritic morphology
in a rodent model of autism
Claire Niehaus, Sarah Raza, Allona
Harker, Bryan Kolb, Robbin Gibb
Autism Spectrum Disorder (ASD) is a heterogeneous
neurodevelopmental disorder ranging from mild to severe symptomology. With most
research examining only high functioning ASD, the present study focused on the
development of a viable rat model of low-functioning ASD. This was accomplished
through an extension of the valproic acid (VPA) rodent model, whereby a single
dose of VPA (800mg/kg) produces behavioural and neuroanatomical correlates
similar to ASD in humans. To simulate low-functioning ASD, the dosage was
increased from a single dose to a double dose of VPA (800mg/kg X 2).
Neuroanatomical (Golgi) analyses of the affected offspring were conducted,
including spine density, dendritic complexity, and dendritic ength of the Cg3
region of the brain.
9.
Using experimental autoimmune encephalomyelitis as a mouse model of multiple
sclerosis
Stella Babatunde, Rachael Chan, Vaibhav Singh, Brian
Ficiur, V.Wee Yong, Gerlinde A.S. Metz
Multiple Sclerosis (MS) is an inflammatory
demyelinating disease with high prevalence in Alberta. Studies have used
experimental autoimmune encephalomyelitis (EAE) in mice to model the pathology
of MS. The purpose of this study was to determine a dose-response relationship
between EAE-inducing reagents and the severity of symptoms. All treated animals
showed EAE symptoms, however, the severity and course of EAE did not correlate
with the reagent concentration. In addition, some animals displayed a multiphasic
course of EAE. This model may therefore provide a useful tool for studies of
relapsing-remitting MS.
10.
Sit back, relax, and enjoy the trip? The impact of
shipping stress on behavioural testing
Rachael Chan,
Stella Babatunde, Brian Ficiur, Grace Forster, Gerlinde A.S. Metz
Stress impacts behavioural attributes and shipping
stress is no exception. Our investigation sought to find if shipping stress has
an adverse effect on behavioral test outcomes in mice, and if it affects
response to an additional stressor. Male and female mice shipped from
Charles-Rivers (CR) were compared to animals bred in-house (IH). The results
suggest that shipping stress increased anxious behaviours compared to a non-stressed
analogue. In post-stress tests, the CR mice displayed less motor movement and
more anxiety than the IH mice. Thus, the source of animals represents a
critical variable in neurobehavioural studies and stress research.
11.
Everyone loves road trips (except mice): The effects of shipment stress
on motor function in adult mice
Grace Forster, Brian Ficiur, Stella Babatunde, Rachael
Chan, Gerlinde A.S. Metz
Exposure to stress can lead to a number of adverse health
outcomes. Uncontrollable stress may therefore change the results in biomedical studies.
Here we proposed that shipment of animals from an external breeder induces stress
that affects the results of neurobehavioural experiments. The motor abilities
of adult mice shipped from a breeder were compared to those of animals bred
in-house using footprint analysis. We found that an important parameter
differed between the two groups of animals. These results indicate that
shipment stress is a confounding variable and should be considered when
evaluating the results of behavioural tests.
MEMORY & DECISION-MAKING
12. & 13.
Targeted memory reactivation quickens procedural skill
learning
Cormac Southam,
Jeremy Sloan, Masami Tatsuno
Targeted memory reactivation (TMR) is the process by
which an unconditioned stimulus is associated with a memory and used to bias
replay of that memory. TMR has been shown to increase the performance of
explicit memory tasks; however, little work has been done on implicit memory.
We tested if an auditory cue would increase the success rate of rats performing
a reaching task. Although the success rate
for both groups plateaued at the same level, the learning speed of the task was
increased. We propose that TMR may be able to increase the rate of implicit
memory learning.
14.
The effects of acute THC on
reinforcement-driven decision-making
Sienna Randolph,
Aaron Gruber
Dopamine release from midbrain
structures is central to reinforcement learning as it provides a reward
prediction error that enables us to make future choices leading to favourable
outcomes, while avoiding those with adverse outcomes. Many drugs of abuse influence
dopamine levels, altering our ability to learn from previous outcomes. Tetrahydrocannabinol (THC), the principal psychoactive constituent of cannabis
for example, acts to increase dopamine levels in the striatum. The
effects of acute THC on reinforcement-driven response adaption in rats in a
binary decision-making task are currently being studied in the Gruber lab. By
understanding how THC alters flexible decision making, we can more fully
understand the behavioural effects as they relate to addiction.
15.
Better
by Surprise: The role of prediction in gambling addiction
Kyler Fisher, Catherine
Laskowski, Hannah Wilson, David Euston
In a fixed-ratio (FR) schedule of reinforcement, reward is delivered for
every fixed number of responses. In a random-ratio (RR) schedule of
reinforcement, a reward is given after an average number of responses but the
actual number of responses in a given trial varies unpredictably. The
random-ratio schedule resembles slot-machine style gambling and as such might
be a useful model of gambling. RR schedules differ from FR schedules primarily
by reward delivery being unpredictable. We asked whether rats trained on RR
would differ from rats trained on FR in operant chambers working for food
pellet reward given that both groups were receiving equal quantities of reward
for their responses across trials. Both groups are then to be tested on
measures of addiction and we expected to find that the RR group will display
more addictive behavior.
NEW METHODS AND TECHNOLOGIES
16.
Establishing a collection process for in vivo metabolomics
Zach Wanner, Tony Montina, Gerlinde A.S. Metz
Nuclear magnetic resonance (NMR) spectroscopy of in vivo microdialysis offers a unique
potential to identify and quantify metabolites within the extracellular fluid
of specific brain regions. Here we used microdialysis at different probe
lengths and multiple buffer flow rates to collect samples for the analysis of
extracelullar metabolomic profiles in mice. This technique may provide a
promising new tool to identify real-time metabolic profiles linked to altered
affective state and neurological disease in animal models.
17.
Adult-born neurons
in the dentate gyrus lack AAV induced DREADD expression
Kate Chua, Justin Lee, Robert Surtherland, Robert
McDonald
Designer Receptors
Exclusively Activated by Designer Drugs (DREADDs) are chemogenetic tools used
to manipulate neural activity. DREADDs are often expressed using
adeno-associated viruses (AAV) with cell-selective promoters. Until now AAVs 2 and 8 have not been used to characterize the
expression of DREADDs in the rat hippocampus. Here, hippocampal injections
of AAV 2 and 8 with neuron-specific promoters cause expression of DREADDs in
the dentate gyrus (DG), but expression is not observed in new-born neurons in
the DG subgranular zone. This may be useful in studies aiming to dissociate
contributions of mature and newborn neurons in the DG.
18.
A CRISPR tool for genome editing: blocking the biosynthesis
of histidine in bacterial cells
Bryant Young, David Cahana, Neal Melvin
Type II Clustered, Regularly, Interspaced
Short Palindromic Repeats (CRISPR) nucleases for genome editing provides an
easily modifiable nuclease via single-guide (sg)RNA that is flexible,
efficient, low cost and sequence-specific. However, reprogramming of Cas9 in
bacterial genomes induces cell death by chromosomal lesions. To circumvent this
bias, Jian et al., (2013) developed a
genome editing approach in bacteria using Cas9 as a marker-less selection
catalyst in combination with Red Recombineering. This technique relies on
reprogramming Cas9 to kill wild-type cells and using Red phage genes (gam,
exo, bet) in order to introduce a site-specific mutations. Here I
attempt to knockout the biosynthesis of histidine via the introduction of a
stop codon (5’-TAA-3’) at positions 2,092,510 and 2,092,808 of the hisC gene
– responsible for the synthesis of imidazole acetol phosphate aminotransferase
– using CRISPR-Cas9 and Red Recombineering. This
protein is a co-catalyst in the conversion of imidazolyacetolphosphate to
L-histidinol phosphate, a key step in the biosynthesis of histidine. Histidine
deficient bacteria are used to indirectly measure the mutagenic properties of
chemical compounds. Initial round of editing recovered 0% of mutant colonies
suggesting that optimization is in this approach is needed.
19.
Exploration of face
detection with the use of artificial retinas
Marko Ilievski, Arren Glover, Chiara Bartolozzi,
Matthew Tata
Humans are able to detect other human faces at an alarmingly fast rate,
however this task has proven to be much more changing and time consuming for
computers with the use of traditional cameras. This presentation will discuss
the development within the new neuromorphic cameras and how these new cameras
can be used to detect faces with a hopeful increase in speed.