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Defensive Behaviors Driven by a Hypothalamic-Ventral Midbrain Circuit.

Leandra R Mangieri1,2, Zhiying Jiang1, Yungang Lu1

  • 1Brown Foundation Institute of Molecular Medicine of McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030.

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|July 24, 2019
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Summary
This summary is machine-generated.

The paraventricular hypothalamus (PVH) drives defensive behaviors, including escape jumping, by activating a circuit to the ventral midbrain (vMB). This newly discovered pathway is crucial for stress responses and defensive states.

Keywords:
PVHfeedingglutamategroomingjumpingmidbrain

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Area of Science:

  • Neuroscience
  • Behavioral Biology

Background:

  • The paraventricular hypothalamus (PVH) is known to regulate homeostatic processes like stress and feeding.
  • Its role in driving active defensive states, however, has remained largely unexplored.

Purpose of the Study:

  • To investigate whether the PVH can drive defensive behaviors.
  • To identify and characterize the neural circuits through which the PVH mediates these behaviors.

Main Methods:

  • Optogenetic stimulation of PVH neurons in mice.
  • Circuit mapping of PVH outputs to the ventral midbrain (vMB).
  • Electrophysiological recordings and in vivo chemogenetics to assess circuit function.

Main Results:

  • Photostimulation of PVH neurons induced escape jumping, a key defensive behavior.
  • Activation of the PVH→vMB circuit elicited a range of defensive behaviors, including escape, hiding, and aversion.
  • Glutamatergic transmission within the PVH→vMB pathway was essential for these behavioral outputs.
  • Midbrain glutamatergic neurons partially mediate PVH-driven escape and hiding.

Conclusions:

  • A novel hypothalamic-midbrain circuit (PVH→vMB) is identified as a driver of defensive states.
  • This circuit plays a significant role in mediating behavioral responses to stress.
  • The findings provide new insights into the neural underpinnings of defensive behaviors and stress-related disorders.