Effects of Embryo Transfer on Emotional Behaviors in C57BL/6 Mice.

Microbiologic standardization plays a key role in the management of animal facilities because contamination of stock could affect the health status and wellbeing of animals and thereby induce artifacts in biomedical research. One common method to avoid the dissemination of pathogens is embryo transfer (ET). Although disturbances in the perinatal environment may cause long-lasting effects on the behavior and physiology of mouse offspring, the influences of ET during this sensitive phase have not yet been addressed. Our study investigated the effects of various components of ET (anesthesia, surgery, recipient strain) on the behavior of dams (exploration, nest-building) and offspring (nest-building, exploration, anxiety, and social and depressive-like behaviors). For ET, the donor strain C57BL/6N and a standard protocol were used. Whereas treatment with anesthesia-analgesia did not affect maternal behavior, female offspring demonstrated overall effects on weight gain and corticosterone levels. Compared with naturally delivered female offspring, dams obtained through ET demonstrated decreased exploration and nest-building. In addition, female ET-derived offspring had enhanced levels of anxiety and increased social interest. Furthermore, ET-derived dams obtained by using NMRI as the recipient strain showed increased exploratory behavior compared with that of dams obtained by using C57 mice as recipients. Compared with using C57 as recipients, both sexes of offspring transferred into NMRI recipients weighed more, and female mice showed a depressive-like phenotype. Our findings suggest that ET, now considered to be a routine procedure in animal husbandry, bears the risk of introducing artifacts.

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