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Rostral Ventromedial Medulla (RVM) Projects to the Lateral Hypothalamic Area (LHA) to Drive Aversion and Anxiety.

Mousmi Rani1, Devanshi Piyush Shah1, Smriti Koul1

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A newly discovered neural pathway from the rostral ventromedial medulla (RVM) to the lateral hypothalamic area (LHA) drives anxiety-like behaviors in mice. This pathway converts stress and pain into anxiety without affecting pain perception.

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Stress and Anxiety Research

Background:

  • Neurons in the lateral hypothalamic area (LHA) are crucial for stress responses.
  • The specific inputs driving LHA activity during stress are not fully understood.
  • The rostral ventromedial medulla (RVM) is traditionally linked to pain modulation.

Purpose of the Study:

  • To investigate the role of excitatory projections from the RVM to the LHA in stress and anxiety.
  • To identify the neural mechanisms connecting pain/stress experiences to anxiety-like behaviors.

Main Methods:

  • Utilized intersectional viral genetics, optogenetics, chemogenetics, and fiber photometry in mice.
  • Investigated the function of RVM-to-LHA projections.
  • Assessed anxiety-like behaviors and nociceptive thresholds.

Main Results:

  • Excitatory RVM projections to the LHA drive anxiety-like behaviors in both male and female mice.
  • Activation of RVM-inputted LHA neurons induces anxiety without altering pain thresholds.
  • RVM-LHA pathway activation is recruited by acute restraint stress and noxious thermal stimuli.

Conclusions:

  • A novel ascending circuit from the RVM to the LHA is identified as a key driver of anxiety-like behaviors.
  • This pathway mediates aversion and anxiety without influencing nociception, offering new insights into pain-anxiety links.
  • Findings challenge the traditional view of the RVM, highlighting its role in anxiety beyond pain modulation.