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Involvement of the dopamine system in paternal behavior induc
saline/clozapine-N-oxide
Wenqi Cai, Huan Ma, Yufeng Xun, Wenjuan Hou, Limin Wang, Xueni Zhang, Yufeng Ran, Wei Yuan, Qianqian Guo, Jing Zhang, Laifu Li, Yang Yang, Yitong Li, Zijian Lv, Zhixiong He, Rui Jia, Fadao Tai
Pub Date: 2021-08-10, DOI: 10.1016/j.bbr.2021.113519, Email: [email protected]
Like mothers, fathers play a vital role in the development of the brain and behavior of offspring in mammals with biparental care. Unlike mothers, fathers do not experience the physiological processes of pregnancy, parturition, or lactation before their first contact with offspring. Whether pup exposure can induce the onset of paternal behavior and the underlying neural mechanisms remains unclear. By using Slc:ICR male mice exhibiting maternal-like parental care, the present study found that repeated exposure to pups for six days significantly increased the total duration of paternal behavior and shortened the latency to retrieve and care for pups. Repeated pup exposure increased c-Fos-positive neurons and the levels of dopamine- and TH-positive neurons in the nucleus accumbens (NAc). In addition, inhibition of dopamine projections from the ventral tegmental area to the NAc using chemogenetic methods reduced paternal care induced by repeated pup exposure. In conclusion, paternal behavior in virgin male ICR mice can be initiated by repeated pup exposure via sensitization, and the dopamine system may be involved in this process.

Figure 1. Injection and expression of virus.
In the present study, the authors further explored whether pup exposure could facilitate paternal behavior in virgin male ICR mice and investigated how the mesolimbic DA system is involved in this process. In conclusion, paternal behavior in virgin male ICR mice can be initiated by repeated pup exposure via sensitization, and the dopamine system may be involved in this process.
 
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