JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
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Sex differences in brain-derived neurotrophic factor signaling and functions.

Brain-derived neurotrophic factor (BDNF) is a member of the neurotrophin family that plays a critical role in numerous neuronal activities. Recent studies have indicated that some functions or action mechanisms of BDNF vary in a sex-dependent manner. In particular, BDNF content in some brain parts and the tendency to develop BDNF deficiency-related diseases such as depression are greater in female animals. With the support of relevant studies, it has been suggested that sex hormones or steroids can modulate the activities of BDNF, which may account for its functional discrepancy in different sexes. Indeed, the cross-talk between BDNF and sex steroids has been detected for decades, and some sex steroids, such as estrogen, have a positive regulatory effect on BDNF expression and signaling. Thus, the sex of animal models that are used in studying the functions of BDNF is critical. This Mini-Review summarizes our current findings on the differences in expression, signaling, and functions of BDNF between sexes. We also discuss the potential mechanisms for mediating these differential responses, with a specific emphasis on sex steroids. By presenting and discussing these findings, we seek to encourage researchers to take sex influences into consideration when designing experiments, interpreting results, and drawing conclusions. © 2016 Wiley Periodicals, Inc.

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