The membrane actions of estrogens can potentiate their lordosis behavior-facilitating genomic actions.
The membrane actions of estrogens can facilitate their genomic actions. To determine whether this facilitation bears on CNS mechanisms for estrogen-dependent behaviors, ovariectomized rats were subjected to a two-pulse treatment of estrogen directly in the hypothalamic ventromedial nucleus. Two days later, each rat was given progesterone and then tested for lordosis behavior, the induction of which requires the genomic actions of estrogen. When estrogen was given in both pulses (15 min to 2 h duration, and 5 h apart) lordosis was induced. Based on results from studies on neuroblastoma cells, we hypothesized that the membrane actions of estrogen in the first pulse would potentiate the genomic actions of estrogen in the second. This hypothesis was confirmed with the use of a membrane-impermeable estrogen. However, surprisingly, the order of the pulses could be reversed and still achieve lordosis behavior induction. Finally, activators of protein kinase A or PKC were effective substitutes for the membrane-limited pulse of estrogen. Thus, estrogen-induced membrane actions in the hypothalamus can potentiate its lordosis-inducing genomic actions on behavior and may be mediated by signaling pathways involving the activation of protein kinase A and PKC.
Laboratory of Neurobiology and Behavior, The Rockefeller University, New York, NY 10021, USA. kowl@mail.rockefeller.edu
Lee-Ming
LM
Kow
Donald W
DW
Pfaff
D000818:Animals; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D004789:Enzyme Activation; D004958:Estradiol / Q000008:administration & dosage*; D005260:Female; D016678:Genome; D008297:Male; D008566:Membranes / Q000187:drug effects; D011187:Posture; D011374:Progesterone / Q000008:administration & dosage; D011493:Protein Kinase C / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D012710:Serum Albumin, Bovine / Q000008:administration & dosage; D012726:Sexual Behavior, Animal / Q000502:physiology*; D014697:Ventromedial Hypothalamic Nucleus / Q000187:drug effects / Q000502:physiology
C043090:estradiol-bovine serum albumin; D012710:Serum Albumin, Bovine; D011374:Progesterone; D004958:Estradiol; D017868:Cyclic AMP-Dependent Protein Kinases; D011493:Protein Kinase C