In mammals, estrogens have a multiplicity of effects in all known neural ce
lls. We review here some of the mechanisms enabling estrogens to differenti
ate their influence on neural targets, in view of the potential interest in
the use of estrogens in the therapy of several pathologies of the nervous
system, we have proposed the use of a reductionist approach for the systema
tic understanding of estrogen activities in each specific type of target ce
ll. We have therefore generated a model system in which to study the activa
tion of one of the known estrogen receptors: estrogen receptor alpha. This
system allowed us to identify a number of novel genes, the expression of wh
ich may be influenced following the activation of this receptor subtype by
estradiol. We here report on preliminary data obtained by the study of one
of these target genes, nip2, which encodes a proapoptotic protein product.
We hypothesize that Nip2 might be an important molecular determinant for es
trogen anti-apoptotic activity in cells of neural origin.