Congratulation to all participants
of the symposium for giving great presentations,
with special congratulations
to the winners:
1st place:
Erik Fraunberger
2nd place:
Douglas Kiss
3rd place:
Melissa Bexte
4th place:
Scott Wong
============================================================
Abstracts
TRANSGENERATIONAL
PROGRAMMING and NEURODEVELOPMENT
1.
Mechanisms of
Transgenerational Programming by Stress: The Expression Profiles of Hippocampal
Glucocorticoid Receptors
Laise Vieira, Yongxin Hao, Gerlinde Metz
Hippocampal
glucocorticoid receptors (GRs) are considered to be a crucial part of the
negative feedback control for terminating a stress response. Early life stress
may permanently disrupt the ability of hippocampal GRs to negatively regulate
the stress response axis. The present study investigated the transgenerational
effects of prenatal stress on endocrine parameters by immunohistochemical and
stereological analysis of GR density in hippocampal subfields of male and
female F3 generation rats born to stressed great-grandmothers. Our findings
show that transgenerational stress reduced GR density in dentate gyrus and
CA1-2 in sex-specific patterns. These findings indicate that a family history
of stress can permanently alter stress responses by downregulating GR
expression even in remote generations.
2.
Exposure to Ancestral Stress Promotes Sexually
Dimorphic Behavioural Traits
Amanda Weiler, Mirela Ambeskovic, Jamshid Faraji,
Gerlinde A. Metz
Prenatal stress
(PS) has sexually dimorphic effects on anxiety levels in adulthood. Here we
investigated if ancestral exposure to PS in previous generations will affect
anxiety-like behaviour in adult rats. Anxiety-like behaviour was assessed in
the adult male and female F4 rat offspring born to transgenerationally or
multigenerationally stressed mothers, and controls. The results revealed that
the effects of ancestral PS on anxiety-like behaviours in the elevated plus
maze were limited to male offspring. Transgenerational PS exacerbated
anxiety-like behaviours in comparison to multigenerationally stressed and
non-stressed animals. These findings support the notion that males respond more
strongly to PS than females. This behavioural trait has potential adaptive benefits.
Multigenerational stress, by contrast, may promote habituation through repeated
exposure.
3.
Transgenerational Programming of Social Behaviour:
Survival of the Fittest?
Adrielle P. Souza Lira, Zachary T. Erickson, Sergio M.
Pellis, Gerlinde A. Metz
Prenatal and
transgenerational programming by stress may prepare offspring for survival in a
hostile environment by altering social behaviours. Here we investigated the
impact of transgenerational stress on social behaviour, cooperation and
aggression in rats. Groups of adult rats with a family history of stress and
controls were tested for patterns of sharing or competing in a water
competition task. Time at the water spout revealed that stress reduced enhanced
competitive and aggressive behaviours. By contrast, stressed animals exposed to
environmental enrichment were more willing to share access to the water spout
and animals generally became more cooperative. These observations show that
ancestral stress enhances dominant behaviours, which are attenuated by
environmental intervention.
4.
Preconception Paternal Alcohol Exposure Impacts
Offspring Neurodevelopment
Melissa Bexte, Allonna Harker, Robbin Gibb
Though it is
well known that the prenatal environment can be adversely affected by maternal experience,
there is limited examination of the influence of father experience in
maturation of offspring. We examined consequences of paternal alcohol exposure
prior to conception on the developing brain and behavior of the offspring. A
subset of paternal alcohol offspring were sacrificed on postnatal day 21 for
anatomical analysis, the remaining offspring underwent behavioral testing in
adulthood. These rats were sacrificed on postnatal day 160 for anatomical
analysis. Anatomical findings suggest changes in cortical thickness,
demonstrating possible effects of paternal alcohol exposure.
5.
Effects of Bystander Stress on Early Behaviour and
Adolescent Nicotine Sensitization
Erik Fraunberger, Bryan Kolb, Robbin Gibb
Research related
to neural plasticity in the developing brain in response to stress and
psychoactive drugs has provided valuable insights into how the brain works to
compensate for or adapt to changing environmental pressures or stressors. The
goals of this project are to investigate the effect of a novel bystander stress
paradigm on offspring behavior and medial prefrontal cortex structure as well
as its influence on adolescent sensitization to nicotine.
6.
Prenatal Exposure to a ‘Double Dose’ of Valproic Acid
Alters Behaviour and Neuroanatomy in a Rodent Model of Autism
Claire Niehaus, Sarah Raza, Bryan Kolb, Robbin Gibb
Autism is a
heterogeneous neurodevelopmental disorder ranging from mild to severe
symptomology. While current animal research has focused primarily on simulating
high-functioning autism, cases of severe or low-functioning autism are less
explored. The main objective of this study is to simulate low-functioning
autism through the use of the valproic acid (VPA) rodent model of autism. The
VPA rodent model of autism is a viable model given the behavioural and
neuroanatomical correlates to autism in humans.
ADVERSITY and
BRAIN FUNCTION
7.
The effects of chronic amphetamine administration on
network communication in the limbic system
Cecilia Badenhorst, Aaron Gruber
Amphetamine is a
highly abused stimulant used recreationally. Evidence suggests that the
repeated use of amphetamine alters network connections in various regions in
the brain. The Gruber lab is currently investigating these alterations in the
limbic system, which is involved in reward processing and addiction. To model
this, rats were given a schedule of chronic amphetamine and EEG signals were
recorded. Results of this study demonstrate that chronic amphetamine alters
coherence patterns in these brain regions. By understanding the altered neural
communication associated with repeated amphetamine administration, we can more
fully understand the behavioral effects of amphetamine abuse.
8.
The effect of acute
amphetamine on flexible decision making
Alicia Briggs, Aaron Gruber
Previous research in both
animals and humans has shown that dopamine is central to our ability to make
choices that lead to good outcomes, while avoiding those that lead to adverse
outcomes. Amphetamine acts to increase extracellular dopamine levels by
competitive re-uptake inhibition, among other mechanisms. Currently, the Gruber
lab is studying the effect of amphetamine on the reinforcement-driven response
adaptation in the Matching Pennies task in rats. The sensitivity of this task to
behavioral flexibility allows the results to be applicable to addiction, ADHD,
and other impulse control disorders as well as dopamine disorders such as
Parkinson’s disease.
9.
Behavioral and EEG analyses of Long Term Recordings of
Rats with Epileptic Seizures
Sisay Yimenu, Adam Neumann, Robrecht Raedt, Bruce
McNaughton, Artur Luczak
Behavioural and
Electroencephalogram (EEG) analyses of rodent models of epilepsy have been
studied extensively and found to be crucial for determining the behaviours that
could give valuable insight into predicting the oncoming seizure. Although a
great deal of interest focuses on finding the underlying cause of epilepsy, an
endeavour to predict a seizure is important in order to minimize the danger
during and post seizure as well. Therefore, a considerable effort was given to
classify EEG and behavioural similarities among epileptic rat models to
understand the triggering factors to predict a seizure and finding possible
treatment in the future.
MEMORY and
FORAGING BEHAVIOUR
10.
Mapping context-specific behaviour using immediate
early genes
Kelsey O'Brien, Tine Gulbrandsen, Rob Sutherland
Previous studies
have shown that the brain can store and retrieve context memories independent
of the hippocampus (HPC). In the present
study, we used a catDISH method to spatially and temporally map neural
ensembles of behaving rats. We located a
region outside of the HPC, which distinguishes between two different contexts
during memory retrieval, and may be involved in non-HPC memory.
11.
Real World Morris Task Performance in Adult Men and
Women
McKinley Pawlak, Mashal Fida, Iasmim Montechiare, Erin
Zelinski, Rob Sutherland
The Morris Water
Task (MWT) is used to assess spatial abilities, though it has mostly been used
in rodents or as a virtual or tabletop task in humans. We adapted the MWT for
human subjects in the real world. Participants locomoted through a grassy field
until given an auditory cue signaling that they had reached a single random,
visually unmarked target location. Number of trials to criterion, trial
duration, and recall of target location were analyzed in young men and women
(ages 19-25). Our results indicate that humans and rats use similar strategies
to solve Morris water-like tasks.
12.
Wild hummingbirds (Selasphorus rufus) use featural information
rather than geometrical cues when foraging for food in both vertical
and horizontal planes
Becky Friesen, T. Andrew Hurly
Within a
laboratory setting, many species have demonstrated use of geometrical information
in spatial orientation when foraging for food, however subjects have rarely
been tested in the wild. Fourteen wild rufous hummingbirds were trained to use
a featural cue to locate a rewarded flower in a rectangular array of four
artificial flowers, then tested when the cue was removed. Each bird was trained
and tested in horizontal and vertical orientations. Birds chose all four
flowers equally in both orientations, suggesting that they did not encode the
geometry of the array but relied on featural information to locate the reward.
13.
The Influence of
Social Threat on Foraging Behaviour
Erica Nordin,
David Euston
Rodent
foraging behaviours can be manipulated by changing environmental features. The
purpose of this experiment was to determine whether the threat of food theft by
a larger adult male conspecific influenced a rat’s decision to carry food
pellets back to a shelter. The foraging behaviour of rats was observed in two
conditions: with a conspecific present and absent. Preliminary results of the
pilot indicate a mild increase in carrying when the conspecific is present;
however, this result is insignificant. A more thorough understanding of rodent
foraging behaviour is important to establish consistency in experiments which
use food as a motivator.
MOTOR CONTROL
and REACHING
14.
Hand Maps and Graspable Capabilities
Giovanna Zaninelli, Lara Coelho, Claudia Gonzalez
The perception
of our hands is known to be greatly distorted with an overestimation of its
size. If hand perception is inaccurate, how is it possible to produce precise
reach-to-grasp movements? Is the perception of our hands influenced by
external, ecologically-relevant stimuli? To investigate this last question we
presented a big (apple) and a small (grape) graspable object near the hand
while participants reported perceived hand size. Results showed that object
size influenced hand perception but only for the right hand. Results are
discussed in relation to relevant literature on the effects of perception on
action and hemispheric differences for reach-to-grasp actions.
15.
Everybody Loves
Trains: A New Assessment of Motor Deficits in Rats
Brian Ficiur, Jamshid
Faraji, Gerlinde Metz
Skilled walking provides a sensitive measure of motor function in animal
models of nervous system disease. Here we developed the new Parallel Beam Task
to assess limb coordination and placement accuracy of fore- and hind limbs.
Rats were trained to walk across an elevated track of two parallel metal rails.
Four aspects of skilled walking were scored for each limb using video analysis.
Scoring multiple limb placement components enhances the sensitivity of the PBT
to identify subtle deficits in skilled walking patterns. Findings from lesion
studies suggest that the PBT may be useful for assessing loss and recovery of
function in pre-clinical animal models of nervous system damage.
NEW METHODS AND
TECHNOLOGIES
16.
Metabonomics of
Stress
Douglas Kiss, Tony Montina,
Gerlinde Metz
Physiological changes within an organism alter metabolic activity. The
field of qualitatively analysing these changes is called metabonomics. It has
previously been shown that stress alters behavior and that these alterations
can be progressively transmitted across generations to offspring. Using a
trans-generational stress model we implemented 1H NMR spectroscopy of urine to
analyse the metabolic change that accompanies stress.
17.
Characterising
the Expression and Distribution of Myelin Transcription Factor 1-like (MYT1L)
in the Brain of the Laboratory Rat
Janet Poplawski, Youli Yao,
Igor Kovalchuk, Gerlinde A. Metz
Myelin transcription factor 1-like (MYT1L), a gene belonging to the
myelin transcription factor 1 gene family, has been implicated in a variety of
diseases and health conditions. However, the expression and distribution of
MYT1L in the normal, healthy brain has yet to be examined. Here, we explored
these properties of MYT1L to further clarify its function in the nervous
system. Our results indicated that, although MYT1L was expressed in nearly all
brain regions, its distribution was highly heterogeneous. The findings support
the proposed functions of MYT1L and also suggest novel roles of this gene in
the nervous system.
18.
Development of a Model of Multiple Carotid
Micro-Emboli Injections
Richard Kline, Sunny Wang & Majid Mohajerani
Previous
research has suggested that micro-infracts caused by micro-emboli, or ‘silent
strokes’, may be linked to cognitive decline. These micro-infracts vary in
size, and can occur at multiple times in humans. Nevertheless, past research
has been focused on looking at single injections of micro-emboli, with single
sizes of micro-emboli per specimen. Here, we test a model of multiple carotid
injections using 15 and 20 µm fluorescent micro-emboli targeted to
embed within the penetrating arterioles of the brain. Brain tissue was then
analyzed for vessel blockage, micro-infracts, and hypoxia using fluorescent
Dextran, TTC, H&E, and Pimonidazole.
19.
Real Time EEG
Joshua Pepneck, Matthew Tata
EEG is a common
method for understanding the brains electrical activity in response to an
event. It is however quite limited in it’s portability and real time
applications. We have been working towards using a portable EEG recorder to
analyze raw EEG data while it is being acquired to enable for real time
classification of an event, as well as the ability to then recognize that event
during post training.
20.
A Novel Method for the Semi-Automated Quantification
of Dendritic Spines
Scott Wong, Aaron Gruber
Research has
demonstrated that dendritic spines are dynamic structures exhibiting plastic
changes in response to various stimuli. These alterations have been implicated
in cellular processes such as memory, learning, and addiction. Of particular
interest in the Gruber lab are the changes manifesting in the neurons of the
limbic system as a result of repeated drug administration. This presentation
will showcase a new method being developed to analyze altered spine morphology
in this network of brain regions as a result of optogenetic stimulation or
amphetamine administration.
21.
The effects of
transcranial direct current stimulation on sleep in rats
Eric Paxman, Henrique Ellwanger, LeAnna Kalvi, Karim
Ali, Michael Eckert, Masami Tatsuno
Studies in humans and
rodents have shown that transcranial direct current stimulation during sleep
(sleep-tDCS) can alter endogenous brain oscillations and enhance memory
retention. However, the effect of sleep-tDCS has not yet been
investigated systematically. In this pilot study, tDCS was administered to rats
during SWS or REM sleep. Preliminary analyses suggest that although many
aspects of sleep are robust, it is possible to alter certain sleep features,
depending on the sleep state in which tDCS is administered. We have also
investigated timing relationship between hippocampal sharp waves-ripples and
cortical K-complexes. We found that tDCS did not affect their timing.