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Topic: Lordosis behavior

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	Lordosis - Wikipedia, the free encyclopedia
		Lordosis is a term used to describe the direction of the curvature of the five lumbar and seven cervical vertebrae of the vertebral column.
		Loss of lordosis is sometimes seen with painful spinal conditions.
		Lordosis also refers to the position that some mammals (cats, mice, etc) display when they are ready to mate.
	en.wikipedia.org /wiki/Lordosis (247 words)

	The Psychopharmacology of Sexual Behavior
		The behavior of a rat in the operant and place preference procedures may, therefore, be controlled by the same mechanisms that underlie unconditioned appetitive or preparatory responses, and these appear not to reside within the mPOA, because lesions of the structure are also without effect on these parameters (19, 20).
		Similarly, icv infusions increase lordosis behavior in rats treated chronically with estrogen or treated with estrogen and progesterone, suggesting that progesterone may exert a permissive effect on the actions of exogenous oxytocin (11).
		Dopamine transmission increased comparably in both regions during sexual behavior, although the effect in the nucleus accumbens seemed to be related to the incentive quality of the stimulus male, whereas the effect in the striatum seemed to be related to the ability of the female to pace the copulatory contact (50).
	www.acnp.org /g4/GN401000071/CH071.html (8765 words)

	Subchronic Administration of Fluoxetine Impairs Estrous Behavior in Intact Female Rats (Site not responding. Last check: 2007-10-18)
		A lordosis quotient was computed by dividing the number of lordosis (dorsiflexion of the back in response to a mount) with the total number of mounts and multiplying this ratio with 100.
		The concept that serotonin is a factor of importance for cycle-related changes in behavior lends support from a recent study showing that cycle-related differences in stress induced by swimming in rats is abolished by the administration of the strong (but nonselective) SRI clomipramine (Marvan et al.
		The effect of fluoxetine on estrous behavior, on receptive behavior, and on lordosis was, hence, increased as a function of time; whereas, the effect on motivation was fast in onset and transient.
	www.nature.com /cgi-taf/dynapage.taf?file=/npp/journal/v19/n6/full/1395223a.html (3759 words)

	Role of hormones in sexual behaviour (Site not responding. Last check: 2007-10-18)
		Lordosis refers to a characteristic posture in which the female rodent arches her back and moves her tail to permit penetration by the male.
		The behavioural measure was the lordosis score, that is, the percentage of trials on which the female showed a lordosis response when the male attempted to mount her.
		The lordosis score measures this by expressing the number of times a female emits the lordosis posture as a percentage of the number of times she is mounted by a sexually experienced and vigorous male.
	salmon.psy.plym.ac.uk /year1/psy128sexual_behaviour/sexbehav.htm (4889 words)

	Journal Abstract (Site not responding. Last check: 2007-10-18)
		Plasma levels of dihydrotestosterone in the cycling rat: implications for the regulation of lordosis behavior.
		Exogenously administered dihydrotestosterone (DHT) is a potent inhibitor of sexual behavior in ovariectomized, estrogen-primed rats and endogenous DHT has been implicated as an inhibitor of sexual behavior in cycling rats.
		To determine the temporal relationship between DHT levels and the expression of sexual behavior, females were tested at midnight of each day of the 4-day estrous cycle for lordosis response to male mounts and subsequently bled.
	www.trincoll.edu /~kdunlap/abstracts/plasma.htm (164 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		Specifically, we are investigating the effects of the hormone estrogen on areas of the brain controlling rat female reproductive behavior, i.e., lordosis.
		Lordosis is a steroid-dependent mating behavior that requires estrogen action in a specific group of cells within the ventromedial nucleus (VMN) of the rat hypothalamus.
		Cohen, R.S. and Pfaff, D.W. Ventromedial hypothalamic neurons in the mediation of long-lasting effects of estrogen on lordosis behavior.
	www.uic.edu /depts/mcbtp/rcohen.htm (472 words)

	baillement-lordosis (Site not responding. Last check: 2007-10-18)
		Genetic influences on lordosis, a mammalian social behavior, are amenable for study because of the relative simplicity of both stimuli and response.
		The neural circuit for lordosis involves a supraspinal loop, which is controlled by an estrogen- and progesterone-dependent signal from the medial hypothalamus and results in heightened sexual motivation.
		Lordosis is the vertebral dorsiflexion performed by female quadrupeds in response to adequate stimuli from a reproductively competent male.
	perso.easynet.fr /baillement/lordosis-pfaff.html (751 words)

	Female Sexual Behavior (Site not responding. Last check: 2007-10-18)
		The post oluvatory decrease in sexual behavior may be an indication that estrogen increases sexual desire and progesterone decreases it.
		Characteristic behavior of the proceptive female rats include engaging in flirting behaviors: wiggling their ears, hopping around ridgedly or play "tag" with the male.
		One possible reason for her behavior is that it's not good for the female to invest all her energy in having the offspring when the new male will probably kill them.
	soma.npa.uiuc.edu /labs/greenough/statements/rswain/hormones/022196.html (1727 words)

	The 26S Proteasome Participates in the Sequential Inhibition of Estrous Behavior Induced by Progesterone in Rats -- ...
		the expression of estrous behavior in ovariectomized, estrogen-primed
		Effect of PSI on the facilitation and sequential inhibition of lordosis induced by P. OVX animals, treated as described in Materials and Methods, were assessed for lordosis behavior (n = 8/group).
		Effect of the proteasome inhibitor TLCK on the facilitation and sequential inhibition of lordosis induced by P. OVX animals, treated as described in Materials and Methods, were assessed for lordosis behavior (n = 6–7/group).
	endo.endojournals.org /cgi/content/full/145/5/2328 (4223 words)

	Anne M. Etgen Ph.D., Selected References
		Inhibition of lordosis behavior by intrahypothalamic infusion of a protein kinase G antagonist.
		Dilute estradiol implants and progestin receptor induction in the ventromedial nucleus of the hypothalamus: correlation with receptive behavior in female rats.
		Antagonism of female sexual behavior with intracerebral implants of antiprogestin RU 38486: correlation with binding to neural progestin receptors.
	www.aecom.yu.edu /home/psychiatry/BasicResearchLabs/etgen (1658 words)

	[No title]
		Female sexual behavior depends on the presence of estrogen.
		Animals were also given esýÿÿÿ‘’“”•—— ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎþÿÿÿû'ÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúþÿÿÿþÿÿÿýÿÿÿþÿtrogen and tested for lordosis every 7 days during the experiment (males received less estrogen than females).
		T and P alone did not inhibit lordosis.¡¯¯ó ¨ Future Study¡ ¨ÝT+ P result was a new finding so it is important to replicate the experiment in order to confirm the finding.
	www.neiu.edu /~lruecker/psychogios.ppt (253 words)

	Research Projects in the Vasudevan Laboratory
		Behavioral phenomena such as feeding, social interactions and reproductive behaviors are integral part of our lives. However, little is known about the different ways in which the behavior can be controlled.
		To study complex phenomena such as behavior, we must have a good model system where a stimulus is tightly coupled to an easily observable behavior. Such a stimulus-response coupled system is the estrogen induction of sex behavior or lordosis in female rodents.
		Thyroid hormone reduces reproductive behavior in several species including birds, mammals via an unknown central mechanism. The thyroid hormone receptor (TR), also a member of the nuclear receptor superfamily, exists as four isoforms, a1, a2, b1 and b2.
	www.bio.psu.edu /people/faculty/vasudevan (660 words)

	Ovarian Hormone Dependence of alpha 1-Adrenoceptor Activation of the Nitric Oxide-cGMP Pathway: Relevance for Hormonal ...
		Facilitation of lordosis behavior by 8-br-cGMP and 8-br-cGMP reversal of prazosin inhibition of lordosis behavior.
		Chu HP, Etgen AM (1997) A potential role of cyclic GMP in the regulation of lordosis behavior of female rats.
		Fernandez-Guasti A, Rodriguez-Manzo G, Beyer C (1983) Effect of guanine derivatives on lordosis behavior in estrogen-primed rats.
	www.jneurosci.org /cgi/content/full/19/16/7191 (4604 words)

	Disinhibition of female sexual behavior by a CRH receptor antagonist in Syrian hamsters -- Jones et al. 283 (3): 591 -- ...
		infusion of CRH or urocortin inhibited estrous behavior in ovariectomized
		of NPY inhibits estrous behavior in rats and hamsters (4, 5).
		Anti-sexual and anxiogenic behavioral consequences of corticotropin-releasing factor overexpression are centrally mediated.
	ajpregu.physiology.org /cgi/content/full/283/3/R591 (4538 words)

	PUBS (Site not responding. Last check: 2007-10-18)
		Bloch, G.J., Dornan, W.A., Babcock, A.M., Gorski, R.A., and Micevych, P.E. Effects of site-specific CNS microinjection of cholecystokinin on lordosis behavior in the male rat.
		Babcock, A.M., Barton, J.C., Bloch, G.J., and Micevych, P.E. Vagotomy blocks the peripheral effects of CCK-8 on lordosis behavior in the rat.
		Bloch, G.J., Dornan, W.A., Babcock, A.M., Gorski, R.A., and Micevych, P.E. Lordosis response to site-specific cholecystokinin in the male.
	www.montana.edu:8181 /wwwpy/Faculty/babcock/pubs.htm (1296 words)

	Web Home Page
		Scopolamine fails to inhibit lordosis in female rats with septal lesions.
		The cholinergic facilitation of sexual behavior in intact, cycling female rats during proestrus.
		Behavioral, intellectual, and developmental effects on learning in first grade children of low socioeconomic status.
	www.ucs.louisiana.edu /~csm5689 (1454 words)

	Neuroendocrine Interactions
		Illustrative examples include the coordination by gonadal hormones of reproductive processes with reproductive behavior during reproductive cycles that are synchronized to diurnal or seasonal rhythms, and the synchronization by adrenal steroids of energy metabolism with food-seeking behavior and cognitive alertness during the diurnal sleep-wake cycle.
		with the time of behavioral sexual receptivity and preparation of the reproductive tract for pregnancy is the function of circulating estradiol and progesterone.
		brain is the integrative center for coordinating the behavioral and neuroendocrine responses (hormonal, autonomic) to challenges, some of which qualify as “stressful” but others of which are related to the diurnal rhythm and its ability to coordinate waking and sleeping functions with the environment.
	www.acnp.org /g4/GN401000068/CH.html (7962 words)

	ABSTRACTS AND PAPERS PRESENTED AT SCIENTIFIC MEETINGS
		Marrone, B.L., Rodriguez-Sierra, J. and Feder, H.H. Inhibition of lordosis by intracranial implants of progesterone in the female rat.
		Hagley, M.T. and Rodriguez-Sierra, J. Serotonergic and non‑serotonergic neurons of the septum inhibit lordosis in the female rat.
		Rosa-Molinar, E. and Rodriguez-Sierra, J. Behavioral correlates to gonadal status in the mosquitofish Gambusia affinis affinis, (Cyprinodontiformes: Poeciliidae).
	www.unmc.edu /faculty/rodriguez/abstracts.htm (3079 words)

	Demitra Psychogios
		Title: Effects of hormones on sexual behavior in rodents.
		Inhibition of Lordosis Behavior in Male and Female Rats by Androgens and Progesterone.
		T+P and DHT inhibited lordosis behavior in Gx males and not females.
	www.neiu.edu /~lruecker/psychogios.htm (339 words)

	Estrogen and Thyroid Hormone Receptor Interactions: Physiological Flexibility by Molecular Specificity -- Vasudevan et ...
		Estrogens are necessary for the induction of the primary female-typical sexual behavior lordosis (91) in several species.
		Normal gene expression for ER is required for normal lordosis behavior (128, 132).
		Reproductive and affiliative behaviors are differentially affected according to which of the ERs is deleted in mice.
	physrev.physiology.org /cgi/content/full/82/4/923 (8625 words)

	Brain and Behavior (IPHY 3730), University of Colorado at Boulder (Site not responding. Last check: 2007-10-18)
		Female sexual behavior (e.g., lordosis behavior) is regulated in part by the Ventromedial hypothalamus (VMH) and the AMG.
		Sniffing and rubbing behaviors by the male 2.
		You observe that male hamsters exhibit a lot of marking behavior once they passed through puberty, and you wonder if this behavior is regulated by male steroid hormone(s).
	www.colorado.edu /epob/epob3730rlynch/11reproduction.html (1420 words)

	Lordosis behavior -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-18)
		Lordosis behavior -- Facts, Info, and Encyclopedia article
		Since these afferent neurons are also part of a (The neural path of a reflex) reflex arc, lordosis can also be triggered (An automatic instinctive unlearned reaction to a stimulus) reflexively.
		(An abnormal inward (forward) curvature of the vertebral column) Lordosis
	www.absoluteastronomy.com /encyclopedia/l/lo/lordosis_behavior.htm (127 words)

	PUBLICATIONS
		Rodriguez-Sierra, J. Naggar, A. and Komisaruk, B. Monoaminergic mediation of masculine and feminine copulatory behavior in female rats.
		Rodriguez-Sierra, J. Crowley, W. and Komisaruk, B. Induction of lordosis responsiveness by vaginal stimulation is independent of anterior or posterior pituitary hormones.
		and Feder, H. Differential effects of prostaglandins on lordosis behavior in the female guinea pigs and rats.
	www.unmc.edu /faculty/rodriguez/publications.htm (1685 words)

	Ventromedial Nucleus of the Hypothalamus (Site not responding. Last check: 2007-10-18)
		estrogen and progesterone act at the VMH to activate female sex behavior
		if you give estrogen for 2 days followed by a single injection of progesterone, lordosis behavior will be shown 4 hours later
		if you implant estrogen capsules within the VMH and administer progesterone systemically, lordosis behavior will be shown (estrogen acts specifically within VMH to stimulate lordosis; this is also true for progesterone)
	www.umich.edu /~psycours/531/female_sex_behavior/tsld012.htm (190 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		decrease lordosis behavior D. increase lordosis behavior 23) The male red-sided garter snake mates A.
		A. the olfactory system; lesions eliminate sexual behavior B. the amygdala; lesions eliminate sexual behavior C. the spinal cord; transection eliminates erections and ejaculations D.
		A. progesterone levels are high and this may decrease female attractiveness B. progesterone levels are high and this may inhibit female sexual desire C. women who desire children may limit sexual activity during this period because they are less fertile D.
	soma.npa.uiuc.edu /labs/greenough/statements/rswain/hormones/exam2/EXAM2B.html (1577 words)

	A Critical Role for the Evolutionarily Conserved Gonadotropin-Releasing Hormone II: Mediation of Energy Status and ...
		Females displayed increasing sexual behavior with increasing experience; FD significantly reduced mating behavior on trial 5.
		Moss RL, Foreman MM 1976 Potentiation of lordosis behavior by intrahypothalamic infusion of synthetic luteinizing hormone releasing hormone.
		Moss RL, McCann SM 1973 Induction of mating behavior in rats by luteinizing hormone releasing factor.
	endo.endojournals.org /cgi/content/full/145/8/3639 (5640 words)

	Pituitary Adenylate Cyclase-Activating Peptide: A Pivotal Modulator of Steroid-Induced Reproductive Behavior in Female ...
		Serotonin (50 ng icv) was used to demonstrate an intact pathway for receptivity in PRKO mice because those females with targeted disruption of PR fail to display P-facilitated lordosis (14).
		as lordosis quotient (LQ)] behaviors in response to mounting
		behavior paradigm for rats was used (3, 4, 5, 7).
	mend.endojournals.org /cgi/content/full/18/1/173 (5741 words)

	Functional Interactions between Estrogen and Insulin-Like Growth Factor-I in the Regulation of alpha 1B-Adrenoceptors ...
		Barfield RJ, Chen JJ (1977) Activation of estrous behavior in ovariectomized rats by intracerebral implants of estradiol benzoate.
		Fernandez-Galaz MC, Naftolin F, Garcia-Segura LM (1999) Phasic synaptic remodeling of the rat arcuate nucleus during the estrous cycle depends on insulin-like growth factor-I receptor activation.
		-adrenergic agonists act on the ventromedial hypothalamus to cause neuronal excitation and lordosis facilitation: electrophysiological and behavioral evidence.
	www.jneurosci.org /cgi/content/full/22/6/2401 (5049 words)

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