Rachel Bergman, Eileen Gongon, David Handsman, Saheela Ibraheem, Eileen Jiang, Nikhil Keny, Wendy Wei, Caresse Yan, Annie Yang, Sabrina Zeller, Allen Zheng,

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Presentation transcript:

Rachel Bergman, Eileen Gongon, David Handsman, Saheela Ibraheem, Eileen Jiang, Nikhil Keny, Wendy Wei, Caresse Yan, Annie Yang, Sabrina Zeller, Allen Zheng, Linda Zhong New Jersey Governor’s School of Sciences 2010 Q: How Many Rats does it take to screw in a light bulb?

Why Does Anxiety Research Matter? Anxiety disorders are the MOST common mental illness in the US 18% of those 18 yrs or older (40 million) $42 Billion/yr in medical costs Advancing knowledge on anxiety Animal model [source: Anxiety Disorder Association of America]

Fear vs. Anxiety Fear o Response to immediate danger o Short duration Anxiety o Response to potential danger o Long duration

Acoustic Startle Response Response to intense auditory stimuli Well documented pathways Characterized by spontaneous muscle contraction

Three Separate Experiments OFPS Conditioned stimulus (CS): neutral stimulus paired with an unconditioned stimulus (US), which automatically triggers a response Davis, Walker, and Paschall experiment 1. Odor (CS) 2. Shock (US) LES Good model of anxiety Bright light is naturally aversive to rats Long duration stimulus No conditioning needed APS Pheromones- detected by same species Allomones- detected by another species Trigger anxiety response in rats Increase neural activity in medial nucleus and AOB

0.5mm La Ce sensory input rapidly-developing, phasic fear response: “conditioned fear” Source: Pitkanen et al. (2001)

0.5mm La Ce slowly-developing, sustained fear response: “anxiety” BNST sensory input rapidly-developing, phasic fear response: “conditioned fear” Source: Pitkanen et al. (2001)

0.5mm La Ce slowly-developing, sustained fear response: “anxiety” BNST sensory input Me rapidly-developing, phasic fear response: “conditioned fear” Source: Pitkanen et al. (2001)

0.5mm La Ce slowly-developing, sustained fear response: “anxiety” BNST sensory input Me pheromone/ allomone input rapidly-developing, phasic fear response: “conditioned fear” Source: Pitkanen et al. (2001)

Hypothesis Lesions in the medial nuclei would be expected to result in: o decrease in startle response in the experiments involving oFPS, LES, and APS La Ce slowly-developing, sustained fear response: “anxiety” BNST sensory input Me pheromone/ allomone input rapidly-developing, phasic fear response: “conditioned fear”

Experimental Process Medial Amygdala Surgery One Week Recovery Olfactory Fear Potentiated Startle Light Enhanced Startle Allomone Potentiated Startle

Subjects Twenty male rats, g Unlimited access to standard rat chow and water Housed individually in clear plastic cages 3 groups: control, sham, and lesion

Startle Chamber Apparatus

Olfactory Fear Potentiated Startle Procedures Day 5: Startle Test Session Day 4: Conditioning with Odor-Shock Pairings Day 3: Baseline Day 2: Baseline Day 1: Baseline EXPERIMENT 1

Analysis: Olfactory Fear Potentiated Startle Rats’ percent potentiation during odor pulses relative to trailing no odor pulses

Light-Enhanced Startle Procedures Part 1: 5 min no sound, followed by 41 random pulses every 30 sec  complete darkness Part 2: Repeat  complete darkness Part 3: 46 Random pulses every 30 sec  complete darkness Part 2: Repeat with Light EXPERIMENT 2

Light-Enhanced Startle was Achieved

AMe Lesions Disrupted LES Sham Rats Lesion Rats Startle Amplitude Change is higher during DLD testing than in DDD testing for sham rats. Suggests that sham rats also experience light-enhanced startle. Lesion rat data suggest medial amygdala lesions decrease anxiety-related startle L-D D-D % Potentiation

Freezing Behavior Empty Gauze- Filled Container Empty Cat Hair Filled Container Empty Gauze- Filled Container EXPERIMENT 3

Freezing Behavior Apparatus

Cat Hair Induced Sustained Freezing Behavior

Allomone Potentiated Acoustic Startle Nothing Cat Hair ControlExperimental *Setup was identical to that of baseline testing

Very Strange Results Cat hair is anxiogenic, but does not potentiate startle Possible causes -Ventilation -Different triggers/pathways in the nervous system More testing is needed to produce a larger sample size and decrease the standard error Sham Rats: n = 2 Lesioned Rats: n = 4

Conclusion Medial amygdala may play a role in anxiety pathways as shown by LES; unclear from APS Medial amygdala plays no role in OFPS To confirm  more test subjects and histology Consistent with hypothesis and some other studies - This year: study showing lesions enhance startle response

Acknowledgements Dr. Graham Cousens Zack Vogel Lab Assistants: Francesco Laterza, Amanda Kearns, Jaime Ballesteros Tama the cat The Red Cross, Drew University, NJGSS ‘10, Bristol-Myers Squibb, Bayer HealthCare THANK YOU!

QUESTIONS? A: None. Rats prefer to be in the dark.