• Top page
  • Timetable
  • Per session
  • Per presentation
  • How to
  • Meeting Planner



Motivation and Emotion

開催日 2014/9/11
時間 16:00 - 17:00
会場 Poster / Exhibition(Event Hall B)

Social Isolation Induces Parental Behavior in Sexually Naive Male Mice

  • P1-222
  • 折笠 千登世 / Chitose Orikasa:1,2 永岡 謙太郎 / Kentaro Nagaoka:2 近藤 保彦 / Yasuhiko Kondo:3 佐久間 康夫 / Yasuo Sakuma:4 南 史郎 / Shiro Minami:1 
  • 1:日本医科大学老人病研究所 / Inst. of Development and Aging Science, Nippon Med.Sch. 2:東京農工大学大学院 / Tokyo Univ. Agri, and Tech., Tokyo ,Japan  3:帝京科学大学 / Teikyo Univ. of Sci., Tokyo, Japan 4:東京医療学院大学 / Univ. Tokyo Health Sci., Tokyo, Japan 

Maternal care is an indispensable element of reproduction in mammalian species that feed offspring by lactation. When pups are present, lactating females immediately initiate maternal cares, such as licking around anogenital area, pup retrieving to the nest, and crouching over pups. These behaviors are female specific and are considered as one of sexually dimorphic behavior. In male mammals, parental care was not so spontaneous. Indifference or overt aggression towards pups is mostly common in most strains of laboratory male mice. It has been reported in males that experience of mating followed by cohabitation with the gestated females suppresses infanticide and provokes males to be parental similar to lactating mother.
Here, we report that sexually naive male mice show parental behavior toward pups after social isolation. The isolation for 3 weeks, but not sufficient for a week, made male mice parental. The effect of social isolation was not restricted to adolescence of the aged 5-8 weeks old. It was also induced by that of postpubertal 8-11 weeks old. The effect of social isolation was blocked by social odors derived from an adjacent chamber, suggesting that olfactory cues of male conspecifics plays a key role in isolation-induced parental behavior in male mice. When virgin male mice encountered with pups at first sight, the males occasionally showed infanticide, no matter whether they were parental. Thus, such social isolation does not affect incidence of infanticide.
This is the first demonstration of the facilitatory effect of social isolation on parental paternal behavior in sexually inexperienced male mice. We also showed a key role of olfactory cues that may develop a disinhibition of brain circuits regulating parental care in the male mice.

Copyright © Neuroscience2014. All Right Reserved.