Developmental fluoxetine exposure normalizes the long-term effects of maternal stress on post-operative pain in Sprague-Dawley rat offspring

PLoS One. 2013;8(2):e57608. doi: 10.1371/journal.pone.0057608. Epub 2013 Feb 21.

Abstract

Early life events can significantly alter the development of the nociceptive circuit. In fact, clinical work has shown that maternal adversity, in the form of depression, and concomitant selective serotonin reuptake inhibitor (SSRI) treatment influence nociception in infants. The combined effects of maternal adversity and SSRI exposure on offspring nociception may be due to their effects on the developing hypothalamic-pituitary-adrenal (HPA) system. Therefore, the present study investigated long-term effects of maternal adversity and/or SSRI medication use on nociception of adult Sprague-Dawley rat offspring, taking into account involvement of the HPA system. Dams were subject to stress during gestation and were treated with fluoxetine (2×/5 mg/kg/day) prior to parturition and throughout lactation. Four groups of adult male offspring were used: 1. Control+Vehicle, 2. Control+Fluoxetine, 3. Prenatal Stress+Vehicle, 4. Prenatal Stress+Fluoxetine. Results show that post-operative pain, measured as hypersensitivity to mechanical stimuli after hind paw incision, was decreased in adult offspring subject to prenatal stress alone and increased in offspring developmentally exposed to fluoxetine alone. Moreover, post-operative pain was normalized in prenatally stressed offspring exposed to fluoxetine. This was paralleled by a decrease in corticosteroid binding globulin (CBG) levels in prenatally stressed offspring and a normalization of serum CBG levels in prenatally stressed offspring developmentally exposed to fluoxetine. Thus, developmental fluoxetine exposure normalizes the long-term effects of maternal adversity on post-operative pain in offspring and these effects may be due, in part, to the involvement of the HPA system.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Age Factors
  • Animals
  • Animals, Newborn
  • Antidepressive Agents / pharmacology*
  • Depression / drug therapy*
  • Depression / metabolism
  • Female
  • Fluoxetine / pharmacology*
  • Hypothalamo-Hypophyseal System / drug effects
  • Hypothalamo-Hypophyseal System / growth & development
  • Hypothalamo-Hypophyseal System / metabolism
  • Nociception / drug effects*
  • Pain Measurement
  • Pain, Postoperative / metabolism
  • Pain, Postoperative / prevention & control*
  • Pituitary-Adrenal System / drug effects
  • Pituitary-Adrenal System / growth & development
  • Pituitary-Adrenal System / metabolism
  • Pregnancy
  • Rats
  • Rats, Sprague-Dawley
  • Selective Serotonin Reuptake Inhibitors / pharmacology*
  • Stress, Physiological / drug effects
  • Time
  • Transcortin / metabolism

Substances

  • Antidepressive Agents
  • Serotonin Uptake Inhibitors
  • Serpina6 protein, rat
  • Fluoxetine
  • Transcortin

Grants and funding

This research was funded by a Charge de recherché and Apirant grants from Fonds de la Recherche Scientifique-FNRS, Belgium (to JLP and VH) and by the Pain Knowledge Centers of Maastricht and Rotterdam (to LK). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.