...Divya Anchan; Amber Gafur; Kazuhiro Sano; Sonoko Ogawa; Nandini Vasudevan Background/Aims: Estrogens are important effectors of reproduction and are critical for upregulating female reproductive behavior or lordosis in females. In addition to the importance of transcriptional regulation of genes...

... preoptic nucleus (MPN). Estradiol rapidly activates these neurons to release β-endorphin that activates MPN μ-opioid receptors (MOP) to inhibit lordosis. Lordosis is facilitated by the subsequent action of progesterone that deactivates the estradiol-induced MPN MOP activation. Orphanin FQ (OFQ/N; also...

... membrane estrogen receptor, to activate sexually receptive behavior in the female rat. Infusions of STX into the arcuate nucleus of the hypothalamus resulted in the activation and internalization of μ-opioid receptors in the medial preoptic nucleus, an action that is required for lordosis behavior. Indeed...

...), and then vaginal opening and vaginal smears were examined. On day 60, their ovaries were removed and lordosis behavior was observed after subcutaneous implantation of a silicon tube containing E 2 . As a result, in most PPT and all E 2 rats, vaginal opening was advanced and an irregular estrous cycle was observed...

.... Lordosis Proceptivity Sexual motivation Estrogen receptor α Ventromedial nucleus of the hypothalamus Medial posterodorsal amygdala National Institutes of Health (NIH) 10.13039/100000002 Female rodent reproductive behaviors are strictly dependent on ovarian hormones acting within...

... the direct or indirect activation of progesterone receptor (PR) which has two isoforms with different function and regulation: PR-A and PR-B. The contribution of each PR isoform to the regulation of lordosis in rats is unknown. We explored the role of PR isoforms in lordosis display induced by progesterone...

.... This finding suggests an anatomical substrate for interactions between SP and estradiol-sensitive neurons in the midbrain. Such interactions may underlie the effects of SP on female sexual behavior. 5 11 1996 11 03 1996 9 4 2008 Periaqueductal gray Sex behavior Lordosis Gonadal...

... by the ERKO females, which was not seen in wild-type animals. Aggression toward other females was increased. Female-typical lordosis behavior was reduced for at least two reasons: less response to somatosensory stimuli on the hindquarters, as well as the fact that ERKO females were immediately treated...

...Karl F. Malik; Joan I. Morrell; Harvey H. Feder In ovariectomized (OVX) female guinea pigs sequential administration of estradiol and then progesterone (P) is usually necessary to induce the sexually receptive lordosis posture. Systemic administration of alpha-adrenergic agonists can induce...

...Gabriela González-Mariscal; Angel I. Melo; Carlos Beyer In experiment I we studied the capacity of progesterone (P) and two nonsteroidal agents that activate lordosis, but do not bind to the progestin receptor (PR), i.e. luteinizing hormone-releasing hormone (LHRH) and prostaglandin E 2 (PGE 2...

... and proestrus in rats. Lordosis, sexual behavior, was exhibited only by proestrous females at 19.30 h. The content of monoamines and/or metabolites changed from afternoon to early evening of diestrus in a number of brain regions. On proestrus, during the time when females became sexually receptive, additional...

...(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements. c-fos Estrogen FOS Lordosis Oxytocin Paraventricular nucleus Progesterone Ventromedial hypothalamus Original...

... little or no homology to known mRNAs. OTR antisense oligo infusion significantly reduced lordosis frequency and intensity in females primed with estrogen. There was also a significantly greater number of rejection behaviors exhibited by antisense-oligo-infused estrogen-treated females versus controls...

... in the latter group. αMSH (100 ng/side/rat) and NA (20, 200 and 2,000 ng/side/rat) were injected into the VMN of ovariectomised-adrenalectomised rats primed with 1 µg OB. Both agents stimulated lordosis in non-receptive animals with a peak activity at 60 min. The effect of αMSH declined over the next 2 h...

... affected, 94% responded with excitation. This predominant stimulatory action of OT is consistent with its lordosis-facilitating effect, because increases in the activity of VMN neurons are generally associated with the facilitation of lordosis. Pharmacological analyses with selective OT agonists...

...-primed ovariectomised rats that exhibited a low level of lordosis in a pre-lesion test and had no effect in receptive animals. Turnover rates (TR) of DA, noradrenaline (NA) and adrenaline were measured in the ZI, preoptic area (POA), arcuate nucleus (ARC), median eminence (ME) and ventromedial nucleus...

...Margaret M. McCarthy; David B. Masters; Jeannie M. Fiber; Ana-Maria López-Colomé; Carlos Beyer; Barry R. Komisaruk; Harvey H. Feder GABAergic neurotransmission has been implicated in the control of the steroid-dependent behavior, lordosis. GABA has dual effects on lordosis: it facilitates lordosis...

.... Alpha-melanocyte-stimulating hormone Dopamine Estrogen Lordosis Ventromedial nucleus Zona incerta Neuroendocrinology 19 9 1;54:14 22 © 1991 S. Karger AG, Basel 0028-3835/91/0541-0014 S 2.75/0 Interaction of Estradiol, Alpha-Melanocyte-Stimulating Hormone, and Dopamine in the Regulation of Sexual...

... or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements. Vomeronasal organ Sexual receptivity Luteinizing hormone Lordosis Neuroendocrinology I990;52: 368-372 Role of the Vomeronasal Organ in the Male-Induced Enhancement of Sexual...

...Michael D. Havens; James D. Rose During the induction of lordosis responses in golden hamsters, the joint actions of estradiol (E) and progesterone (P) have been found to produce major changes in the activity levels, sensory responsiveness and movement-related firing of neurons in the dorsal...