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Functional Interrogation of Adult Hypothalamic Neurogenesis with Focal Radiological Inhibition
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Published on: November 14, 2013

Chronic melatonin administration mitigates behavioral dysfunction induced by γ-irradiation.

Seenu Haridas1, Mayank Kumar, Kailash Manda

  • 1NeuroBehavior Laboratory, Division of Radiation Biosciences, Institute of Nuclear Medicine and Allied Sciences, Delhi, India.

Hormones and Behavior
|October 3, 2012
PubMed
Summary
This summary is machine-generated.

Chronic melatonin administration mitigated radiation-induced behavioral changes in mice. Melatonin reduced anxiety and depression-like behaviors following gamma-ray exposure, offering a potential therapeutic strategy.

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Area of Science:

  • Neuroscience
  • Radiation Biology
  • Behavioral Pharmacology

Background:

  • Melatonin, the 'hormone of darkness,' influences reproduction, circadian rhythms, sleep, and neural function.
  • Previous research indicated melatonin's prophylactic effects against radiation-induced neurocognitive deficits.
  • The impact of chronic melatonin on radiation-induced behavioral alterations remained largely uninvestigated.

Purpose of the Study:

  • To investigate the mitigating effects of chronic melatonin administration on radiation-induced behavioral changes.
  • To assess the impact of both continuous (CMA) and nighttime (CNMA) melatonin administration on radiation-affected behaviors in mice.

Main Methods:

  • C57BL/6 mice received chronic melatonin (whole day or night-time) in drinking water for 2 weeks or 1 month post-6 Gy gamma radiation.
  • Behavioral assessments included locomotor activity, gross behavior, anxiety levels (open field test), and depressive tendencies (forced swim test).
  • Various behavioral endpoints were scored at multiple time points following radiation exposure and melatonin treatment.

Main Results:

  • Gamma radiation exposure significantly impaired gross behavioral traits, including exploratory activity and risk-taking behavior.
  • Both continuous (CMA) and night-time (CNMA) melatonin administration significantly ameliorated radiation-induced deficits in exploratory tendencies, rearing, and grooming.
  • Melatonin exhibited anxiolytic effects, improving center exploration, and inhibited radiation-induced depression-like behaviors by reducing immobility time.

Conclusions:

  • Chronic melatonin administration effectively mitigates radiation-induced affective disorders in mice.
  • Both continuous and night-time melatonin administration demonstrate therapeutic potential against radiation-induced behavioral impairments.
  • Melatonin represents a promising agent for managing behavioral consequences of radiation exposure.