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Assessment of Perigenital Sensitivity and Prostatic Mast Cell Activation in a Mouse Model of Neonatal Maternal Separation
Published on: August 13, 2015
Sensitive windows, sensitive outcomes: Early or late-postnatal maternal separation differentially impacts puberty and
Angarika Balakrishnan1, Prabarna Ganguly1, Sheta Roy1
1Northeastern University, 125 Nightingale Hall, Boston, MA, 02115, USA.
Insights
Early life stress impacts development differently based on timing and sex. Maternal separation (MS) in rats shows distinct effects on puberty, memory, and behavior depending on the postnatal window of exposure and the animal's sex.
Area of Science:
- Neuroscience
- Developmental Psychology
- Behavioral Biology
Background:
- Early-life adversity disrupts neurodevelopment, affecting cognitive and emotional regulation.
- Maternal separation (MS) is a rodent model for studying early-life stress.
- Sex and developmental timing are critical but underexplored factors in MS outcomes.
Purpose of the Study:
- To investigate sex-specific effects of early, late, or prolonged MS on pubertal maturation, spatial memory, and anxiety-like behavior in rats.
- To determine how the timing of MS during specific postnatal windows influences these outcomes.
- To highlight developmental timing and sex as key determinants of early-life stress.
Main Methods:
- Rats underwent maternal separation (MS) during early (P2-P10), late (P11-P20), or prolonged (P2-P20) periods.
- Pubertal development was monitored daily.
- Spatial memory was assessed using the delayed win-shift task.
- Anxiety-like behavior and social interaction were evaluated using light-enhanced startle (LES) and dyadic social interaction tests.
Main Results:
- Females exposed to early or prolonged MS showed earlier puberty; males were unaffected.
- Spatial memory was impaired by prolonged MS in females and early MS in males.
- Social behavior was altered by early/late MS in females and late MS in males.
- Males exhibited reduced LES after late MS; females showed enhanced LES after early MS.
Conclusions:
- Maternal separation exerts distinct, sex- and window-dependent effects on pubertal development, cognition, and behavior.
- Developmental timing and sex are crucial factors influencing the consequences of early-life stress.
- Distinguishing postnatal periods is essential for understanding early caregiving disruption impacts.
Abstract:
Early-life adversity disrupts the maturation of neuroendocrine, cognitive, and emotional regulatory systems, yet outcomes likely depend on both the timing of development and sex. Maternal separation (MS) in rodents is a widely used model for studying these effects, yet the sex-specific consequences of distinct postnatal MS windows remain underexplored. Here, we investigated how early [postnatal day (P)2-P10], late (P11-P20), or prolonged MS (P2-P20) influences pubertal maturation, spatial memory, and anxiety-like behavior in male and female Sprague-Dawley rats. Pubertal development was assessed through daily visual inspection. Affective behavior was evaluated using dyadic social interaction and light-enhanced startle (LES), and spatial memory was evaluated in the delayed win-shift task during adolescence. Both postnatal timing of adversity exposure and sex influenced the measured outcomes. Females exposed to prolonged or early MS exhibited significantly earlier pubertal initiation, with no effect of MS on pubertal onset in males. Prolonged or early MS exposure also impaired spatial memory, with females affected by prolonged MS and males affected by early MS. Affective measures in males and females were differentially affected by early and late MS exposure. While only late MS exposure yielded more social approach-avoidance behavior in males, females exhibited approach-avoidance changes after both early and late MS. We replicated previous findings that PMS-exposed males display a blunted light-enhanced startle, and now show that late, but not early MS, yields reduced LES in males. Female adolescents, however, responded to early MS with enhanced LES. Together, these findings demonstrate that MS exerts distinct, sex-specific effects on pubertal maturation and behavior depending on the developmental window of adversity. By demonstrating window and sex-dependent effects on pubertal development, anxiety-like behavior, social interaction, and cognition, this work highlights developmental timing and sex as key determinants of early-life stress outcomes and underscores the importance of distinguishing discrete postnatal periods when modeling the consequences of early caregiving disruption.
