Deficient BDNF signaling has been associated with extinction failure and with a poor response to extinction- based therapies for PTSD. Deficient hippocampal-prefrontal connectivity has been correlated with PTSD severity. Our recent work in rats suggests that BDNF signaling from the ventral hippocampus (vHPC) to the infralimbic prefrontal cortex (IL) modulates fear extinction. Much of what we understand about the emotional regulation related to PTSD comes from experimental fear conditioning and extinction, which model the hyperarousal and re-experiencing of symptoms of PTSD. Much less is known, however, about excessive avoidance seen in PTSD.
In Aim 1, we will investigate the role of BDNF signaling in extinction of avoidance.
In Aim 2, we will improve BDNF signaling to facilitate extinction in rats unable to extinguish avoidance responses.

Public Health Relevance

This research will explore the role of BDNF circuitry in the extinction of avoidance behaviors. Understanding the mechanisms underlying extinction of avoidance will help us understand the circuits of excessive avoidance in PTSD. The knowledge derived from the proposed experiments will contribute to improvement of exposure- based therapies for refractory PTSD. Furthermore, our findings will help develop novel therapeutic approaches for mental disorders characterized by excessive avoidance.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Dissertation Award (R36)
Project #
1R36MH106332-01
Application #
8841097
Study Section
Special Emphasis Panel (ZMH1-ERB-B (05))
Program Officer
Rosemond, Erica K
Project Start
2014-09-15
Project End
2016-08-31
Budget Start
2014-09-15
Budget End
2015-08-31
Support Year
1
Fiscal Year
2014
Total Cost
$40,450
Indirect Cost
$2,974
Name
University of Puerto Rico Med Sciences
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
948108063
City
San Juan
State
PR
Country
United States
Zip Code
00936