, 2006, Morley-Fletcher et al., 2003a, Morley-Fletcher et al., 2003b and Weinstock, 1997). These this website changes, that have been claimed to result from the exposure to high levels of corticosterone (Catalani et al., 2000, Maccari et al., 2003 and Zagron and Weinstock, 2006), include low birth weight, delay in growth and motor development and behavioral impairment in novel situations (Burlet et al., 2005, Drago et al., 1999, Emack et al., 2008, Hauser et al., 2006, Patin et al., 2004 and Secoli and Teixeira, 1998). Corticosterone secretion can be modulated by nutritional factors, provided either
pre- or post-natally. Thus, the 10 day-old offspring of dams fed with fat-rich diets secrete less corticosterone after ether stress (Trottier et al., 1998), whereas adult rats fed with the same type of diet secrete more corticosterone than regular chow fed rats (Tannenbaum et al., 1997). Polyunsaturated fatty acids (PUFAs) are cell membrane constituents essential for the proper functioning and cell response to various stimuli. They are essential fatty acids, e.g., obtained only from diet, and their precursors are linoleic acid or omega-6 (18:2n-6) and alpha-linolenic see more acid or omega-3 (18:3n-3) (Spector, 1999 and Yehuda, 2003). The main omega-3 PUFA metabolites
are the eicosapentaenoic acid (20:5n-3) and docosahexaenoic acid (22:6n-3), while the main metabolite of omega-6 is arachidonic acid (20:4n-6). PUFAs are transferred from the mother to the fetus through the placenta and to the offspring through the milk, in such a way that plasma or cellular levels reflect maternal diet (Amusquivar et al., 2000, Carlson,
2009, Innis, 2008, McNamara and Carlson, 2006, Trottier et al., 1998 and van Goor et al., 2008). Administration of omega-3 during pregnancy, lactation and/or Tolmetin weaning, reduces immobility time in the forced swimming test in the adult offspring, suggesting an anti-depressant effect (Ferraz et al., 2008 and Naliwaiko et al., 2004); this same effect is observed when supplementation takes place only in adulthood (Carlezon et al., 2005, Huang et al., 2008 and Venna et al., 2009). Furthermore, omega-3 supplemented diets significantly reverse anxiety-like behavior, corticosterone secretion and inflammatory responses induced by central administration of the cytokine IL-1β (Song et al., 2003). Taking into consideration that PNS induces depressive-like behavioral changes and that intake of omega-3 inversely correlates with incidence of depression (Alonso et al., 1991, Hibbeln, 1998, Morley-Fletcher et al., 2003a and Morley-Fletcher et al., 2004), the purpose of the present study was to examine the long-term impact of the interaction between omega-3 treatment during pregnancy/lactation and prenatal stress in regards to depressive-like behavior and corticosterone secretion in the adult male offspring. Body weight (Fig. 1): Analysis of body weight in the first day of life showed a main effect of PNS [F(1,140) = 7.19; p = 0.008], but no effect of diet [F(2,140) = 1.
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