DOCSLIB.ORG

Occurrence of Lordosis-Like Posture in Male and Female Mice Given Manual Stimulation During the Early Period of Anesthesia

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Occurrence of Lordosis-Like Posture in Male and Female Mice Given Manual Stimulation During the Early Period of Anesthesia Endocrinol. Japon. 1983 30, (1) 29-33 Occurrence of Lordosis-like Posture in Male and Female Mice Given Manual Stimulation During the Early Period of Anesthesia NOBORUTAKASUGI, MASAMITANAKA* AND HIDEO KATO Department of Biology, Yokohama City University, Seto 22-2, Kanazawa-ku, Yokohama 236 Abstract Normal estrous or diestrous female, ovariectomized female and estrogen plus progestin-primed, ovariectomized female mice of the ICR/JCL strain adopted a lordosis- like posture (LLP) in response to manual stimulation of the dorsal rump when they stood at the initiation of barbiturate anesthesia. Normal and castrated male mice also adopted a LLP following manual stimulation at the commencement of barbiturate anesthesia. In contrast, approximately 60% of anesthetized female mice at day 14 of gestation showed LLP without any tactile stimulation. In these pregnant mice, manual stimulation never brought about any change in the LLP incidence at the initiation of barbiturate anesthesia. Lordosis, the most characteristic posture although incidence of the posture increases in female sexual behavior, is induced in slightly following treatment of castrated laboratory rodents during the periovulatory males with estrogen or estrogen plus proges- period either by mounting of the males tin (Davidson, 1969; Ward, 1974; Yama- (Lisk, 1962) or by manual stimulation of nouchi and Arai, 1976). the dorsal rump (Beach, 1966; Pfaff and On the other hand, Gorski (1971) and Sakuma, 1979a). The lordosis posture con- Arai et al. (1978) have demonstrated that sists of head elevation, rump elevation, the estrogen-progestin treatment induces downward back-arching and tail bending a high incidence of lordosis in adult male (for review, see Arai et al., 1978). Ovari- rats whose testes were removed within a ectomy abolishes the occurrence of lordosis few days after birth. Female rats treated in sexually mature female rats. Treatment neonatally with androgen, however, hardly with estrogen or estrogen plus progestin display any lordosis as adults. It has been results in the resumption of lordosis in considered, therefore, that both endogenous ovariectomized rats (Beach, 1967). Lordosis and exogenous androgen suppresses the has therefore been considered a hormone- development of female sexual behavior in sensitive reflexive response to tactile stimu- the brain of neonatal rats, and activates lation (Komisaruk, 1974). Normal male the programming of male sexual behavior. rats exhibit lordosis only on rare occasions, In the present study, the lordosis-like pos- ture was found in male and female mice Received September 30, 1982. at the initiation of barbiturate anesthesia, *Present address: Department of Pharmacology, the results being reported herein. St. Marianna University School of Medicine, Miya- mae-Ku, Kawasaki 213, Japan. Endocrinol. Japon. 30 TAKASUGI et al. February 1983 by stroking the back at the initiation of barbiturate anesthesia. The LLP-assuming Materials and Methods mice (LLP mice) elevated their heads at an angle of 30•‹ to 120•‹, and lifted their rumps Two-month-old, male and female mice of the slightly. Of the female LLP mice, 27% ICR/JCL strain were purchased from Clea Japan Inc., were estrous and the remaining diestrous. Tokyo. The mice, ranging from 25-30g in body Six of 28 ovariectomized, anesthetized mice weight, were kept in our laboratory vivarium for about one month at a temperature of 23-25•Ž under also adopted the LLP in response to manual a LD 12h:12h schedule. They were given food stimulation (Table 1, Fig. 1). In both pellets (Clea's CA-1) and tap water ad libitum. groups, however, the females were unable Gonadectomy was performed at ca. 2 months of to maintain the LLP for more than 10 age, and used for experiments one month later. Sodium pentobarbital (K & K Lab., Plainview, minutes from the start of the posture. New York), 500mg, was dissolved in 100ml aqueous solution containing 20% propylene glycol and 10% LLP under barbiturate anesthesia in ovariec- ethanol. Mice were anesthetized by intraperitoneal tomized mice receiving injections of estrogen injection of the barbiturate in a dose of 40mg/kg body weight. When the barbiturate-injected mice and progestin became incapable of showing the righting reflex in Eight ovariectomized female mice given response to tail pinching, it was decided that the 3 daily injections of 0.4ƒÊg EB and a single animals started to fall into anesthesia. In all anes- thetized mice, except for one of two groups of injection of 0.1mg P successively were pregnant mice, the experimenter stroked the dorsal mounted by sexually experienced males. rump with his finger starting within 30seconds after Seven of them (87.5%) displayed typical the initiation of anesthesia. Female mice were lordosis, indicating that the dose of EB and mated by the males, and the day when a vaginal P was enough to induce lordosis. plug was found in the female was regarded as day 0 of gestation. The females at day 14 of gestation Fifty-seven ovariectomized mice which were used for experiments. Three daily s. c. injec- received similar injections of EB and P tions of 0.4ƒÊg estradiol benzoate (EB, Sigma Co., were anesthetized with the barbiturate 6h St. Louis)/0.2ml sesame oil and a single s.c. injection of 0.1mg progesterone (P, Sigma Co.)/0.2ml oil on after P injection, and 23 of them showed the following day were given to ovariectomized mice. LLP in respone to manual stimulation. The hormone-primed mice were anesthetized with There was no statistically significant diffe- the barbiturate 6h after P injection. rence in LLP incidence between ovariecto- Vaginal smears were observed daily in all normal and ovariectomized females. In mice adopting the mized, anesthetized mice and those treated lordosis-like posture, the angle of elevation of the with EB and P (Table 1). The hormone- head was measured. It was impossible to measure treated mice never showed LLP over 8 the angle of elevation of the rump since the rump was slightly lifted. The lordosis-like posture, con- minutes. sisting of rump elevation, downward arching of the back and head elevation at an angle of more than LLP in normal and castrated male mice 30•‹, was determined as a positive response. Duration under barbiturate anesthesia of the posture was also measured with a stopwatch. Twenty-eight of 54 normal male mice anesthetized with the barbiturate displayed LLP following manual stimulation (Fig. 2). Results In 4 of 14 castrated male mice, LLP was induced by manual stimulation under bar- Lordosis-like posture (LLP) in normal female, biturate anesthesia (Table 1). The duration and ovariectomized mice under barbiturate time of LLP was 10-120seconds in both anesthesia groups of the males. Twenty-two of 53 normal female mice adopted a LLP in response to stimulation Vol.30, No.1 LORDOSIS-LIKE POSTURE IN ANESTHETIZED MICE 31 Fig. 1. An ovariectomized female mouse adopting a lordosis-like posture (LLP) at the initiation of barbiturate anesthesia. Fig. 2. A normal male mouse exhibiting LLP under bar- biturate anesthesia. Table 1. Occurrence of lordosis-like posture (LLP) in mice given manual stimulation (MS) at the initiation of barbiturate anesthesia. *E: Estrus , D: Diestrus; **EB: Estradiol benzoate, P: Progesterone; Incidence of LLP (ƒÔ2 test): a vs b 0.01<P<0.02; b vs c, d vs e 0.05<P<0.1 Endocrinol. Japon. 32 TAKASUGI et al. February 1983 LLP in pregnant mice under barbiturate stage. It is likely, therefore, that LLP anesthesia found in the present investigation is iden- Seventeen mice at day 14 of gestation tical to the lordosis posture in female were anesthetized with the barbiturate. sexual behavior. Ten of them displayed LLP without any An electroencephalographic study by tactile stimulation. In another group of 14 Margherita et al. (1965) indicated that in mice at the same gestation day, the dorsal rats, a characteristic activation pattern rump was stroked by the experimenter at appears in the ventromedial hypothalamus the initiation of anesthesia. Eight of the (VMH) and basolateral amygdala (BLA) in pregnant, anesthetized mice exhibited LLP a particular light stage of barbiturate anes- when given manual stimulation (Table 1). thesia. Accordingly, it seems probable There is no significant difference in LLP that VMH and/or BLA is related to the incidence between the anesthetized pregnant occurrence of LLP in mice at the initiation mice and those given the tactile stimulation. of barbiturate anesthesia. Yamanouchi and Arai (1975) demonstrated that castrated male rats receiving injections of estrogen Discussion and progestin display lordosis when dorsal afferent neurons to the preoptic and an- Normal estrous female and ovariecto- terior hypothalamic areas were surgically mized, estrogen- or estrogen plus progestin- interrupted. A further study revealed that primed female rats and guinea pigs display the anterolateral fibers connected with the lordosis in response to mounting of the medial basal hypothalamus may function males or to manual stimulation (Beach, in facilitating lordosis in estrogen plus 1966; Pfaff and Sakuma, 1979a). In con- progestin-primed rats (Yamanouchi and trast, normal male, normal diestrous female, Arai, 1979). Pfaff and Sakuma (1979a, and gonadectomized rats of both sexes b) also reported that electrical stimulation hardly adopted the lordosis posture at all of the ventromedial nucleus (VMN) facili- (Gorski, 1971; Arai et al., 1978). The present tates lordosis triggered either by male study, however, revealed that the lordosis- mounting or by manual stimulation in like posture (LLP) is induced by manual ovariectomized, estrogen plus progestin- stimulation in male and female mice of primed rats, and that electrolytic lesions of the ICR/JCL strain despite the presence the VMN induce a gradual decline in the or absence of their gonads as well as in the reflex. According to Beach's studies (1943, diestrous state when the animals stood at 1944), injury to the brain cortices resulted the initiation of barbiturate anesthesia.
Load more

Recommended publications
  • Table 1); Two in for Several Hours (Boccia Et Al., 2007)
    Hormones and Behavior 57 (2010) 255–262 Contents lists available at ScienceDirect Hormones and Behavior journal homepage: www.elsevier.com/locate/yhbeh Manipulation of the oxytocin system alters social behavior and attraction in pair-bonding primates, Callithrix penicillata Adam S. Smith a,⁎, Anders Ågmo b, Andrew K. Birnie a, Jeffrey A. French a,c a Department of Psychology and Callitrichid Research Facility, University of Nebraska at Omaha, Omaha, Nebraska, USA b Department of Psychology, University of Tromsø, Norway c Department of Biology, University of Nebraska at Omaha, Omaha, Nebraska, USA article info abstract Article history: The establishment and maintenance of stable, long-term male-female relationships, or pair-bonds, are Received 12 August 2009 marked by high levels of mutual attraction, selective preference for the partner, and high rates of sociosexual Revised 3 December 2009 behavior. Central oxytocin (OT) affects social preference and partner-directed social behavior in rodents, but Accepted 8 December 2009 the role of this neuropeptide has yet to be studied in heterosexual primate relationships. The present study Available online 16 December 2009 evaluated whether the OT system plays a role in the dynamics of social behavior and partner preference during the first 3 weeks of cohabitation in male and female marmosets, Callithrix penicillata. OT activity was Keywords: Central oxytocin activity stimulated by intranasal administration of OT, and inhibited by oral administration of a non-peptide OT- Pair-bonding behavior receptor antagonist (L-368,899; Merck). Social behavior throughout the pairing varied as a function of OT Sexual behavior treatment. Compared to controls, marmosets initiated huddling with their social partner more often after OT Partner preference treatments but reduced proximity and huddling after OT antagonist treatments.
    [Show full text]
  • This Article Was Originally Published in Hormones, Brain and Behavior 2Nd
    This article was originally published in Hormones, Brain and Behavior 2nd edition, published by Elsevier, and the attached copy is provided by Elsevier for the author's benefit and for the benefit of the author's institution, for non- commercial research and educational use including without limitation use in instruction at your institution, sending it to specific colleagues who you know, and providing a copy to your institution’s administrator. All other uses, reproduction and distribution, including without limitation commercial reprints, selling or licensing copies or access, or posting on open internet sites, your personal or institution’s website or repository, are prohibited. For exceptions, permission may be sought for such use through Elsevier's permissions site at: http://www.elsevier.com/locate/permissionusematerial Gore A C and Crews D Environmental Endocrine Disruption of Brain and Behavior. In: Donald W. Pfaff, Arthur P. Arnold, Anne M. Etgen, Susan E. Fahrbach and Robert T. Rubin, editors. Hormones, Brain and Behavior, 2nd edition, Vol 3. San Diego: Academic Press; 2009. pp. 1789-1816. Author's personal copy 56 Environmental Endocrine Disruption of Brain and Behavior A C Gore and D Crews, University of Texas at Austin, Austin, TX, USA ß 2009 Elsevier Inc. All rights reserved. Chapter Outline 56.1 Introduction to Endocrine Disruption 1790 56.1.1 Critical Issues about Endocrine Disruption 1791 56.1.1.1 Life stage and timing 1791 56.1.1.2 Latency of effects 1791 56.1.1.3 Sensitivity to EDCs 1792 56.1.1.4 Degradation and metabolism,
    [Show full text]
  • Steinach and Young, Discoverers of the Effects of Estrogen on Male Sexual Behavior and the “Male Brain”1,2
    History of Neuroscience History, Teaching, and Public Awareness Steinach and Young, Discoverers of the Effects of Estrogen on Male Sexual Behavior and the “Male Brain”1,2 Per Södersten DOI:http://dx.doi.org/10.1523/ENEURO.0058-15.2015 Section of Applied Neuroendocrinology, Karolinska Institutet, S-141 04 Huddinge, Sweden Abstract In the 1930s, Eugen Steinach’s group found that estradiol induces lordosis in castrated rats and reduces the threshold dose of testosterone that is necessary for the induction of ejaculation, and that estradiol-treated intact rats display lordosis as well as mounting and ejaculation. The bisexual, estrogen-sensitive male had been demonstrated. Another major, albeit contrasting, discovery was made in the 1950s, when William Young’s group reported that male guinea pigs and prenatally testosterone-treated female guinea pigs are relatively insensitive to estrogen when tested for lordosis as adults. Reduced estrogen sensitivity was part of the new concept of organization of the neural tissues mediating the sexual behavior of females into tissues similar to those of males. The importance of neural organization by early androgen stimulation was realized immediately and led to the discovery of a variety of sex differences in the brains of adult animals. By contrast, the importance of the metabolism of testosterone into estrogen in the male was recognized only after a delay. While the finding that males are sensitive to estrogen was based on Bernhard Zondek’s discovery in 1934 that testosterone is metabolized into estrogen in males, the finding that males are insensitive to estrogen was based on the hypothesis that testosterone–male sexual behavior is the typical relationship in the male.
    [Show full text]
  • Spring 2017 – Epigenetics and Systems Biology Discussion Session (Epigenetics and Evolutionary Biology) Michael K
    Spring 2017 – Epigenetics and Systems Biology Discussion Session (Epigenetics and Evolutionary Biology) Michael K. Skinner – Biol 476/576 Week 16 (April 27) Epigenetics and Evolutionary Biology Primary Papers 1. Soyer and O’Malley (2013) Bioessays 35:696-705 2. Skinner, et al. (2014) BMC Genomics 15:377 3. Skinner (2015) GBE 7:1296-1302 Discussion Student 32 – Ref #1 above • What is the evolutionary systems biology referred to? • How can systems biology help understand evolution? Student 36 – Ref #2 above • What is sexual selection? • How did epigenetic transgenerational inheritance change mate preference? • Does this provide evidence for environmental induction of epigenetic transgenerational inheritance and a role in evolutionary biology? Student __ – Ref #3 above • What are the neo-Lamarckian concepts and role of environmental epigenetics? • What are the neo-Darwinian concepts and role phenotypic variation? • What is the integration involved in the unified theory of evolution and role of epigenetics? Prospects & Overviews Evolutionary systems biology: What it is and why it matters Review essays Orkun S. Soyer1) and Maureen A. O’Malley2) Evolutionary systems biology (ESB) is a rapidly growing The emergence of ESB integrative approach that has the core aim of generating mechanistic and evolutionary understanding of geno- At its most basic, evolutionary systems biology (ESB) is the type-phenotype relationships at multiple levels. ESB’s synthesis of system-level approaches to biological function more specific objectives include extending knowledge with evolutionary explanations of multilevel properties. “System” in this context refers to dynamically interacting gained from model organisms to non-model organisms, components that produce behavior not revealed by analyses predicting the effects of mutations, and defining the core of isolated components.
    [Show full text]
  • The Neuroendocrinology of Reproduction: an Overview1
    BIOLOGY OF REPRODUCTION 20, 111-127 (1979) The Neuroendocrinology of Reproduction: An Overview1 ROGER A. GORSKI Department of Anatomy and Brain Research Institute, UCLA School of Medicine, Los Angeles, California 90024 Downloaded from https://academic.oup.com/biolreprod/article/20/1/111/4559056 by guest on 27 September 2021 INTRODUCTION isms, it may be useful to divide the reproductive Each of the preceding speakers in this process into several distinct phases (Table symposium has already reviewed one important 1). A very early step in the reproductive process facet of the neuroendocrinology of reproduc­ is the differentiation of the two individuals tion. Therefore, it is clearly unnecessary to which will eventually be capable of reproducing present a thorough review of this entire field when mature. Although the concept of the and my approach will be to attempt to present sexual differentiation of the reproductive one overall perspective of the role of the brain system is well-known for the internal reproduc­ in the reproductive process while attempting to tive organs and the external genitalia (Wilson, emphasize that which has not already been dis­ 1978), this same concept applies to brain cussed. At best, this discussion will complement function as well. With respect to the peripheral the other presentations, which together do reproductive system, remember that for a form a rather complete overview of the neuro­ period during development, the male and endocrinology of reproduction. To begin with, female are morphologically indistinguishable. it will be helpful to consider the role of the After subsequent differntiation of the gonadal brain in the reproductive process in very anlage into testis or ovary, the secretory activity general terms.
    [Show full text]
  • Female Songbirds the Unsung Drivers of Courtship Behavior and Its
    Behavioural Processes 163 (2019) 60–70 Contents lists available at ScienceDirect Behavioural Processes journal homepage: www.elsevier.com/locate/behavproc Female Songbirds: The unsung drivers of courtship behavior and its neural substrates T ⁎ Ammon Perkesa, David Whiteb, J. Martin Wildc, Marc Schmidta, a University of Pennsylvania, Department of Biology, 433 S University Ave, Philadelphia, PA 19104, United States b Wilfrid Laurier University, Department of Psychology, 75 University Avenue West, Waterloo, Ontario N2011, Canada c University of Auckland, Department of Anatomy and Medical Imaging, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Grafton 1023, Auckland, New Zealand ARTICLE INFO ABSTRACT Keywords: Songbirds hold a prominent role in the fields of neurobiology, evolution, and social behavior. Many of these Copulation solicitation display fields have assumed that females lacked the ability to produce song and have therefore treated song as a male- Mating posture specific behavior. Consequently, much of our understanding regarding the evolution and neural control of song Mating preference behavior has been driven by these assumptions. Here we review literature from diverse fields to provide a Birdsong broader perspective of the role of females in vocal communication and courtship. Recent evidence indicates that song evolved in both males and females and instances of female song are still common. The specialized neural circuit known as the “song system,” which is necessary for singing in males, is also present in females, including those that do not sing, implying broader functions that include evaluating male song and controlling courtship behavior. In addition to having flexible, individualized preferences, females actively shape their social network through their interactions with males, females, and juveniles.
    [Show full text]
  • Download the Course Book (PDF)
    SHORT COURSE 1: Sex Differences in the Brain: Balancing Sex in Preclinical Research Organized by Jill Becker, PhD, and Jessica Tollkuhn, PhDNEW COVER TK Short Course 1 Sex Differences in the Brain: Balancing Sex in Preclinical Research Organized by Jill Becker, PhD, and Jessica Tollkuhn, PhD Please cite articles using the model: [AUTHOR’S LAST NAME, AUTHOR’S FIRST & MIDDLE INITIALS] (2018) [CHAPTER TITLE] Sex Differences in the Brain: Balancing Sex in Preclinical Research. (Becker J, Tollkuhn J, eds) pp. [xx-xx]. Washington, DC : Society for Neuroscience. All articles and their graphics are under the copyright of their respective authors. Cover graphics and design © 2018 Society for Neuroscience. SHORT COURSE 1 Sex Differences in the Brain: Balancing Sex in Preclinical Research Organized by Jill Becker, PhD and Jessica Tollkuhn, PhD Friday, November 2, 2018 8 a.m.–6 p.m. Location: San Diego Convention Center • Room: 6B TIME TOPIC SPEAKER 7:30–8 a.m. CHECK-IN Jill Becker, PhD • University of Michigan 8–8:10 a.m. Opening Remarks Jessica Tollkuhn, PhD • Cold Spring Harbor Laboratory 8:10–9 a.m. Developmental Origins of Sex Differences in the Brain Margaret M. McCarthy, PhD • University of Maryland 9–9:30 a.m. The Stress Response: Sex-Specific Neural Mechanisms Debra Bangasser, PhD • Temple University 9:30–10 a.m. Behavior Paradigms I: Sex-Specific Responses Rebecca Shansky, PhD • Northeastern University 10–10:30 a.m. BREAK 10:30–11:20 a.m. Sex-Dependent Mechanisms of Synaptic Modulation Catherine Woolley, PhD • Northwestern University 11:20–11:50 a.m. Behavior Paradigms II: Reward and Affective Behaviors Laura O’Dell, PhD • University of Texas, El Paso 11:50 a.m.–12:20 p.m.
    [Show full text]
  • The Development of Female Sexual Behavior Requires Prepubertal Estradiol
    5574 • The Journal of Neuroscience, April 13, 2011 • 31(15):5574–5578 Brief Communications The Development of Female Sexual Behavior Requires Prepubertal Estradiol Olivier Brock,1,3 Michael J. Baum,2 and Julie Bakker1,3,4 1Groupe Interdisciplinaire de Ge´noprote´omique Applique´e (GIGA)-Neurosciences, University of Liege, 4000 Liege, Belgium, 2Department of Biology, Boston University, Boston, Massachusetts 02215, 3Netherlands Institute for Neuroscience (NIN), 1105 BA Amsterdam, The Netherlands, and 4Medical Psychology, Vrije Universiteit Medical Center, 1007 MB Amsterdam, The Netherlands The classic view of brain and behavioral sexual differentiation holds that the neural mechanisms controlling sexual behavior in female rodents develop in the absence of ovarian sex hormone actions. However, in a previous study, female aromatase knock-out (ArKO) mice, which cannot convert testosterone to estradiol, showed deficient male-oriented partner preference and lordosis behaviors in response to adult ovarian hormones, raising the possibility that estradiol may contribute to the development of these female sexual behaviors. In the present experiments, administering estradiol prepubertally [between postnatal day 15 (P15) and P25] significantly enhanced the ability of ArKO female mice to display lordosis behavior in response to ovarian hormones administered later in adulthood, whereas treatment with estradiol over an earlier postnatal period (P5–P15) had no such effect. Treatment of ArKO females with estradiol between P15 and P25 also rescued their later preference to approach distal cues from an intact male over an estrous female. ArKO females also displayed significantly less female-directed (male-typical) mounting behavior than wild-type control females when treated with testosterone in adulthood. Prepubertal estradiol treatment failed to reverse this deficit in ArKO females, whereas earlier postnatal estradiol augmented later mounting in both genotypes.
    [Show full text]
  • Steinach and Young, Discoverers of the Effects of Estrogen on Male Sexual Behavior and the “Male Brain”
    This Accepted Manuscript has not been copyedited and formatted. The final version may differ from this version. Research Article: History of Neuroscience | History, Teaching, and Public Awareness Steinach and Young, discoverers of the effects of estrogen on male sexual behavior and the “male brain” History of estrogen and the male brain Per Södersten Section of Applied Neuroendocrinology, Karolinska Institutet, S-141 04 Huddinge, Sweden DOI: 10.1523/ENEURO.0058-15.2015 Received: 30 May 2015 Revised: 16 October 2015 Accepted: 20 October 2015 Published: 2 November 2015 Author contributions: P.S. wrote the paper. Conflict of Interest: Authors report no conflict of interest. Correspondence should be addressed to either Karolinska Institutet, Section of Applied Neuroendocrinology, S-141 04 Huddinge, Sweden, Email: [email protected] Cite as: eNeuro 2015; 10.1523/ENEURO.0058-15.2015 Alerts: Sign up at eneuro.org/alerts to receive customized email alerts when the fully formatted version of this article is published. Accepted manuscripts are peer-reviewed but have not been through the copyediting, formatting, or proofreading process. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed. Copyright © 2015 Society for Neuroscience eNeuro http://eneuro.msubmit.net eN-HON-0058-15R2 Steinach and Young, discoverers of the effects of estrogen on male sexual behavior and the "male brain" This is a confidential document and must not be discussed with others, forwarded in any form, or posted on websites without the express written consent of eNeuro.
    [Show full text]
  • The Nitric Oxide Synthase Inhibitor L-NAME Suppresses Androgen-Induced Male-Like Pseudocopulatory Behavior in Whiptail Lizards
    Brain Research 1052 (2005) 236 – 239 www.elsevier.com/locate/brainres Short Communication The nitric oxide synthase inhibitor l-NAME suppresses androgen-induced male-like pseudocopulatory behavior in whiptail lizards Nicholas S.R. Sanderson, Erik Weissler, David Crews* Institute for Neuroscience, University of Texas at Austin, Austin, TX 78712, USA Accepted 5 June 2005 Available online 14 July 2005 Abstract The synthesis of nitric oxide by the enzyme nitric oxide synthase (NOS) is involved in the androgen-dependent gating of male-typical copulatory behavior, both centrally, particularly in the preoptic area, and peripherally, notably through its role in penile erection. In the all- female whiptail lizard species Cnemidophorus uniparens, individuals display copulatory behaviors indistinguishable from males of similar species if gonadectomized and treated with testosterone. In this experiment, androgenized individuals were treated with a NOS inhibitor, which eliminated male-like behavior in half the individuals, suggesting that the central role of nitric oxide synthesis is conserved in this species. The deficit was principally in mounting, suggesting that sexual motivational systems were affected, rather than consummatory mechanisms. D 2005 Elsevier B.V. All rights reserved. Theme: Neural basis of behavior Topic: Hormonal control of reproductive behavior Keywords: Testosterone; NOS; Nitric oxide; l-NAME; Lizard; Pseudocopulation Male mammals in breeding condition will, in response to suggested that it might be involved in the neural control of a receptive female, display a series of stereotyped behaviors the unusual male-like copulatory behavior observed in culminating in intromission and ejaculation, while animals Cnemidophorus uniparens, an all-female lizard species. C. deprived of androgens by castration will not.
    [Show full text]
  • Hormonal and Genetic Influences on Arousal – Sexual and Otherwise
    Review TRENDS in Neurosciences Vol.25 No.1 January 2002 45 55 Azeh, I. et al. (1998) Experimental pneumococcal 64 Stringaris, A.K. et al. (1997) Increased glutamine (ROS)-dependent fashion and can operate as a meningitis in rabbits: the increase of matrix synthetase immunoreactivity in experimental ROS scavenger and as a respiratory substrate in metalloproteinase-9 in cerebrospinal fluid pneumococcal meningitis. Acta Neuropathol. 93, cerebellar neurons undergoing excitotoxic death. correlates with leucocyte invasion. Neurosci. Lett. 215–218 J. Biol. Chem. 275, 37159–37166 256, 127–130 65 Tumani, H. et al. (2000) Inhibition of glutamine 73 Dirnagl, U. et al. (1999) Pathobiology of ischemic 56 Leib, S.L. et al. (2000) Matrix metalloproteinases synthetase in rabbit pneumococcal meningitis is stroke: an integrated view. Trends Neurosci. 22, contribute to brain damage in experimental associated with neuronal apoptosis in the dentate 391–397 pneumococcal meningitis. Infect. Immun. 68, gyrus. Glia 30, 11–18 74 Lankiewicz, S. et al. (2000) Activation of calpain I 615–620 66 Sastry, P.S. and Rao, K.S. (2000) Apoptosis and converts excitotoxic neuron death into a caspase- 57 Pfister, H.W. et al. (1992) Cerebrovascular the nervous system. J. Neurochem. 74, 1–20 independent cell death. J. Biol. Chem. 275, complications of bacterial meningitis in adults. 67 Haviv, R. and Stein, R. (1998) The intracellular 17064–17071 Neurology 42, 1497–1504 domain of p55 tumor necrosis factor receptor 75 Denecker, G. et al. (2001) Apoptotic and necrotic 58 Pfister, L.A. et al. (2000) Endothelin inhibition induces apoptosis which requires different cell death induced by death domain receptors.
    [Show full text]
  • Smith, Danielle
    Table of Contents Acknowledgements------------------------------------------------------------------------------------------------3 Abstract-------------------------------------------------------------------------------------------------------------4 Introduction--------------------------------------------------------------------------------------------------------5 Methods-----------------------------------------------------------------------------------------------------------13 Results-------------------------------------------------------------------------------------------------------------17 Discussion---------------------------------------------------------------------------------------------------------23 References---------------------------------------------------------------------------------------------------------27 Table of Tables Table 1: Ethogram of male-female interactions, including those which were friendly and those which were unfriendly----------------------------------------------------------------------------------------14 Table 2: Enrichment condition for each week of observation----------------------------------------------16 Table of Figures Figure 1: Enrichment Devices----------------------------------------------------------------------------------16 Figure 2: Mean Duration of Friendly and Unfriendly Behaviors With Enrichment vs. No Enrichment-------------------------------------------------------------------------------------------------18 Figure 3: Mean Duration of each Behavior With Enrichment vs. No Enrichment-----------------------19
    [Show full text]