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Am J Physiol Regul Integr Comp Physiol (September 12, 2007). doi:10.1152/ajpregu.00371.2007
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Submitted on May 25, 2007
Accepted on September 12, 2007

Social stress and recovery: Implications for body weight and body composition

Kellie L. K. Tamashiro1, Mary M. N. Nguyen1, Michelle M. Ostrander2, Stacy R. Gardner2, Li Yun Ma2, Stephen C. Woods2, and Randall R. Sakai3*

1 Neuroscience Program, University of Cincinnati, Cincinnati, Ohio, United States; Psychiatry, University of Cincinnati, Cincinnati, Ohio, United States
2 Psychiatry, University of Cincinnati, Cincinnati, Ohio, United States
3 Department of Psychiatry, University of Cincinnati, Cincinnati, Ohio, United States

* To whom correspondence should be addressed. E-mail: sakairr{at}ucmail.uc.edu.

Social stress resulting from dominant-subordinate relationships is associated with body weight loss and altered body composition in subordinate (SUB) male rats. Here we extend these findings to determine whether stress-induced changes in energy homeostasis persist when the social stress is removed and the animal is allowed to recover. We examined body weight (BW), body composition, and relevant endocrine measures after 1 or 2 cycles of 14 days of social stress, each followed by 21 days of recovery in each rats individual home cage. SUB lost significantly more BW during social housing in a visible burrow system (VBS) compared to dominant (DOM) animals. Weight loss during social stress was attributable to a decrease in adipose tissue in DOM and SUB, with an additional loss of lean tissue in SUB. During both 21-day recovery periods, DOM and SUB regained lost BW but only SUB were hyperphagic. Following recovery, SUB had a relatively larger increase in adipose tissue and plasma leptin compared to DOM, indicating that body composition changes were dependent on social status. Control animals that were weight matched to SUB or male rats exposed to the VBS environment without females, and which did not form a social hierarchy, did not exhibit changes in body composition like SUB in the VBS. Therefore, chronic social stress causes social status-dependent changes in body weight, composition and endocrine measures that persist after repeated stress and recovery cycles and that may ultimately lead to metabolic disorders and obesity.







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