131 Nonetheless, there have been several therapeutic trials of ERT in perimenopausal and postmenopausal women with depression.

Controlled studies employing synthetic forms of estrogen in the treatment of depression have yielded mixed results. Estrogen has been reported to improve mood (albeit inconsistently)132-134 in the following samples: (i) perimenopausal and postmenopausal women reporting depressive symptoms135-137; (ii) postmenopausal women with depression unresponsive Inhibitors,research,lifescience,medical to traditional antidepressant therapy138; and (iii) nondeprcssed menopausal women not experiencing hot flushes.139 We examined the therapeutic efficacy of estradiol replacement in 34 women (approximately half of whom had no prior history of depression) with perimenopausal depression under double-blind, placebo-controlled conditions.129 After 3 weeks of estradiol, depression rating scale scores were significantly decreased compared with baseline scores and significantly lower than scores in the

women receiving placebo. A full or partial Inhibitors,research,lifescience,medical therapeutic response was seen in 80% of subjects on estradiol and in 22% of those Inhibitors,research,lifescience,medical on placebo, consistent with the observed PFI-2 solubility dmso effect size in a recent meta-analysis of studies examining estrogen’s effects on mood.140 The therapeutic response to estrogen was observed in both major and minor depression as well as in women with and without hot flushes. Finally, neither baseline nor posttreatment

estradiol levels predicted therapeutic response. These data suggest that estrogen’s effect on depression is not solely a product of its ability to reduce the distress of hot flushes. Our findings are consistent with data from Montgomery et al135 Inhibitors,research,lifescience,medical and Saletu et al136 suggesting the Inhibitors,research,lifescience,medical beneficial effects of estrogen on mood in perimenopausal women reporting depressive symptoms. Two recent studies, by Scares et al130 and Morrison et al (personal communication) have extended these observations. First, Scares et al reported a significant and beneficial effect of ERT compared with placebo in women with perimenopause related major depression (as defined by the Primary Care Evaluation of Mental Disorders [PRIME-MD])141 and, additionally, reported that baseline plasma estradiol levels did not predict response to estrogen treatment.130 Second, Morrison et al observed that estrogen Thymidine kinase was no more effective than placebo in postmenopausal depressed women in contrast to previous results in perimenopausal women. These data emphasize that the stage of reproductive senescence may predict response to estrogen, as originally reported by Appleby et al.142 Thus, perimenopausal women who are undergoing changes in reproductive function may be more responsive to estrogen than postmenopausal women whose hormonal changes have long since stabilized.