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PubMed2005

Relationship between ethinylestradiol-mediated changes in endocrine function and reproductive impairment in Japanese medaka (Oryzias latipes).

Many biochemical endpoints currently are used to describe endocrine function in fish; however, the sensitivity of these parameters as biomarkers of impaired reproduction or sexual development is not well understood. In the present study, adult Japanese medaka (Oryzias latipes) were assessed for reproductive output and endocrine function, including circulating steroid concentrations, ex vivo steroidogenesis from the gonads, aromatase activity, hepatic estrogen receptor (ER), and plasma vitellogenin (VTG) after exposure to 0, 0.2, 5, 500, and 2,000 ng/L of 17alpha-ethinylestradiol (EE) for 14 d. The EE altered these biochemical responses at various sites along the hypothalamus-pituitary-gonadal axis at concentrations as low as 0.2 ng/L, but it only depressed reproductive function at concentrations of 500 ng/L or greater. Offspring also had reduced ability to hatch at 500 ng/L of EE, but this concentration did not produce any other observed changes in development or sexual phenotype. The reproductive parameters correlated well with VTG, ER, and gonadosomatic index (GSI) in both sexes of adult medaka, which could be indicative of the ER-mediated mode of action for EE. Vitellogenin and ER were elevated at higher concentrations of EE in both sexes, whereas GSI was decreased. Overall, most biochemical endpoints were more sensitive than reproduction or development to exposure, indicating that reproductive function may be relatively protected.

Animals↗
PubMed2002

Lost in translation? The hazards of applying social constructionism to quantitative research on sexual orientation development.

This article explores the hazards faced by social constructionists who attempt to conduct quantitative research on sexual orientation development. By critically reviewing two quantitative research studies, this article explores the ways in which the very nature of social constructionist arguments may be incongruous with the methodological requirements of quantitative studies. I suggest this conflict is a result of the differing natures of these two modes of scholarly inquiry. While research requires the acceptance of certain analytical categories, the strength of social constructionism comes from its reflexive scrutiny and problematization of those very categories. Ultimately, social constructionists who try to apply their theories/perspectives must necessarily conform to the methodological constraints of quantitative research. The intent of this article is not to suggest that it is futile or self-contradictory for social constructionists to attempt empirical research, but that these are two distinct modes of scholarly inquiry which can, and should, co-exist in a dialectical relationship to each other.

Human Development↗
PubMed1985

Delayed female sexual maturation. How to approach differential diagnosis.

Delayed sexual development is present when an adolescent girl fails to experience, at an age that is beyond the average for her peers, those pubertal events that are indexes of gonadal function. Adolescent girls whose sexual development is delayed can be divided into three groups: (1) those who have not menstruated but have well-developed secondary sexual characteristics, indicating that they have a functioning hypothalamic-pituitary-ovarian mechanism, (2) those with poorly developed secondary sexual characteristics whose hypothalamus and pituitary are functional but who have ovarian failure, as indicated by high levels of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) (hypergonadotropic hypogonadism), and (3) those with poorly developed secondary sexual characteristics whose normal ovaries are not functioning because of a hypothalamic or pituitary disorder, as indicated by low or low normal serum FSH/LH levels (hypogonadotropic hypogonadism). There are, in addition, individuals with a female habitus and external female genitalia who were reared as females but have an XY karyotype and come to the physician with a complaint of delayed female sexual maturation.

Adolescent↗
PubMed1982

Sexual life of women with the Küstner-Rokitansky syndrome.

The sexual development and sex life of 12 women with the Küstner-Rokitansky syndrome, in whom the developmental anomaly (vaginal agenesis) was corrected through surgery, were examined through structured interviews and by means of questionnaires. The comparison group was 22 women who had regular menses and a functional sex life. All differences between the groups were statistically nonsignificant. Only in one questionnaire was there a slight trend toward retarded heterosexual development in the patient sample.

Adult↗
PubMed1994

Familial testotoxicosis in a Chinese family.

We report two cases of 'familial testotoxicosis' in a family of Southern Chinese descent. The proband, an 8-year 4-month-old boy and his 35-year-old father both presented with early sexual development. In both cases the testicular volume was only 6 ml despite fully developed secondary sexual characteristics. Both patients had adult testosterone concentrations but a suppressed gonadotrophin response to gonadotrophin-releasing hormone. The suppressed gonadotrophin response to gonadotrophin-releasing hormone in the father suggests that autonomous gonadal production of sex steroid by the testes can persist well into adult life in some patients with familial testotoxicosis.

Adult↗
PubMed2005

Sex on television and its impact on american youth: background and results from the RAND Television and Adolescent Sexuality study.

Many policy makers and parents have called for stricter regulation of television, fearing that the sexual content in this medium spurs adolescent sexual activity. Media theory and research over the last few decades are consistent with this notion but fall short of answering the question of whether television content is causally related to adolescent sexual behavior. This article briefly reviews this earlier work and discusses the results of several new studies based on the RAND Television and Adolescent Sexuality data set. Practitioners should discuss television use and television portrayals of sex with adolescents, and help youth to identity and avoid any adverse effects the media might have on their sexual development and sexual behavior.

Adolescent↗
PubMed2001

Growth hormone treatment in adults: is there a true gender difference?

The importance of growth hormone (GH) deficiency in adults became evident at the end of the 1980s, when the first clinical studies on GH replacement therapy in adults were published. Since then, accumulated experience has shown a great individual variability in the response to GH replacement, including a potential difference in responsiveness between genders. The aim of this paper is to review the data regarding the effects of gender differences on GH pharmacokinetics, pharmacodynamics, and efficacy of replacement. In addition, we start with a short review of the possible role of GH in sexual development and sexual life.

Adult↗
PubMedDate not supplied

Low sexual desire in midlife and older women: personality factors, psychosocial development, present sexuality.

OBJECTIVE: Recent population-based surveys indicate that the prevalence of sexual dysfunction, particularly low sexual desire and arousal disorders, is increasing with age. However, there seems to be greater variability of the sexual experience and functioning in midlife and older women, suggesting a higher dependence on basic conditions like general well-being, physical and mental health, quality of relationship, and life situation. DESIGN: A series of studies was conducted in the authors' Female Sexual Dysfunction research group to assess differences in (1) determinants of sexual satisfaction, (2) personality factors, and (3) present sexuality between younger and older women in both patient and nonpatient populations. RESULTS: The results of these studies highlight that in comparison with functional women, patients with hypoactive sexual desire are generally characterized by a vulnerable self-system with several rather inadequate self-regulatory mechanisms. The results of the brief sexual function questionnaire indicate that the present sexuality of women seeking professional help for low sexual desire is significantly different from the sexuality of a control group of nonpatients. These between-group effects proved to be far more important than any age effects within both groups and showed that all domains of sexuality were negatively affected and overshadowed by the sexual dysfunction. CONCLUSIONS: These results are supportive of the growing evidence against a simple model of midlife sexuality that depicts women as victims of their bodily and hormonal changes. Instead, life stressors, contextual factors, past sexuality, and mental health problems are more significant predictors of midlife women's sexual interest than menopause status itself. Evaluation and treatment approaches require consideration of the full range of contextual factors, including relationship quality, personality factors, past experience, and mental and physical health.

Aged↗
PubMed1977

Reproductive ability of an adult female with Silver-Russell syndrome.

An adult female with typical features of Silver-Russell dwarfism gave birth to a viable infant. Despite the abnormalities in sexual development that may be associated with the Silver-Russell syndrome, fertility is not necessarily impaired, at least in females. The growth and development of children with the Silver-Russell syndrome have been studied (Silver, 1964; Tanner et al., 1975). There is, however, virtually no information available about adult patients with this syndrome. It is known that both male and female Silver-Russell dwarfs develop secondary sexual characteristics (Rimoin, 1969; McDowell and Sproles, 1973) but fertility of these patients has not been described previously.

Adult↗
PubMed1986

Male gender identity: early developmental roots.

The purpose of this paper has been to bring together a wide variety of ideas about male gender and sexual development into a broader and updated view. Toward that end, I have suggested that we view the concept of gender identity along three intertwining strands; core gender identity, gender role identity, and choice of love object. I have also suggested some important contributions made to each of these strands at various phases of development. I have concentrated upon the early childhood roots of gender identity, particularly as the earliest years are the time when important internal structures are established and consolidated. Later manifestations, although not the same as the early ones, have their roots in the early childhood configurations. However, the contributions to an overall broad sense of gender identity made during the latency and adolescent years must not be overlooked. The final outcome of any position along any of the strands is not finally consolidated until the end of adolescence. Indeed, adult experiences may also make important contributions.

Adult↗
PubMed1987

Schoolgirl pregnancies in Libode, Transkei.

Thirty rural black schoolgirls were interviewed after they had given birth to determine the factors predisposing to pregnancy, which was unplanned in all except 1 and had disrupted schooling and caused parental distress. Twenty of the girls knew how conception occurs and 24 knew about modern methods of contraception, although none was used; many of them were misinformed. There was evidence of neglect by parents and society to counsel and educate young people about sexual development, conception, sexual relationships and appropriate use of contraceptives. The schoolgirls drifted, with a lack of mature decision-making, into sexual relationships. This study indicates that more extensive research is needed among rural black schoolgirls to determine the incidence of pregnancies and whether intervention is justified.

Adolescent↗
PubMedDate not supplied

[Genes, hormones and the risk factors in the development of the male phenotype].

The onset of the expression of Sry and other sex-determining genes such as SF-1, DAX-1, WT-1 and SOX family initiates the testis organogenesis from the bipotential primordium. The fetal testis produces anti-Mullerian hormone and testosterone. These two hormones play essential role in the further development of the male phenotype. The bases for the activity of the sexual function and behavior are created within frames of these processes. Interindividual differences in these characters may achieve high degrees. Alleles of the sex-determining genes and the genes of the other genetic systems which participate in regulation of reproduction may be responsible for this variability. For example, the inherited variations in testosterone levels in the blood are negatively correlated to the alpha2-adrenergic receptor densities in the hypothalamus in males of mouse strains. Testosterone level in the fetal blood during critical period of sexual differentiation is one of the key points through which genetic and ontogenetic factors affect male sexual development. We have found nearly twofold interstrain differences in testosterone levels in the blood of male rat fetuses of 2 strains. The rats with higher testosterone levels during intrauterine development have higher rates of sexual maturation and sexual activity in future life. Genetic differences were also found in sensitivity of fetal testosterone to disruptive influences. These differences may be the reason for the strain-specific effects of prenatal stress or glucocorticoid treatment on the male sexual development in rats and mice. Substances and treatments which are capable of changing testosterone levels and/or interaction of these hormones with their receptors: ionizing radiation, pesticides, xenoestrogenes, drugs, alcohol, various stressors are the risk factors of the male sexual development.

Animals↗
PubMed1997

The effect of prepubertal immunization against gonadotropin-releasing hormone on the development of sexual and social behavior of bulls.

To determine the effect of prepubertal immunization against GnRH on the development of sexual and social behavior of Friesian bulls, 90 calves were randomly assigned to five treatments: 1) I2, immunized against GnRH at 2 and boosted at 2.5, 4, and 7.5 mo of age, n = 2 x 10; 2) I4, immunized against GnRH at 4 and boosted at 4.5 and 7.5 mo of age, n = 2 x 10; 3) I7.5, immunized against GnRH at 7.5 and boosted at 8 mo of age n = 2 x 10; 4) S, steers castrated at 2 mo of age, n = 10; and 5) B, intact bulls, n = 2 x 10. Blood samples were collected initially every 2, then every 3 wk. Plasma was analyzed for anti-GnRH titers and plasma testosterone concentration. Sexual and agonistic behavior, male-male mounting, and damage to paddocks was assessed throughout the experiment. All immunized calves developed antibodies against GnRH (32.3 +/- 2.0% bound at a 1:10 plasma:PBS-BSA dilution, 14 d after first boost). Plasma testosterone concentrations were < 1 ng/mL for all immunized animals until 11 mo of age, when they increased to levels found in intact bulls at 14 mo of age. At slaughter, testes and seminal vesicle weights were 38.3 and 31.6% lighter, respectively, for all immunized treatments compared to B. There were no significant differences between I2, I4, and I7.5 in any of the sexual or agonistic behavior tests. Bulls scored higher than steers in all sexual behavior tests. Immunized bulls scored lower than bulls in sexual behavior tests from 10 to 17 mo of age. The proportion of immunized animals that serviced an estrous cow was lower than the proportion of intact bulls at 10, 12.5, 14, and 17 mo of age. Immunized animals scored lower than bulls in bull challenge tests at 8.5, 11.5, 13, 14.5, and 17 mo of age. Paddock damage by animals on the three immunization treatments was lower than that by bulls from 7 to 14.5 mo of age, as were leg were scores (an indicator of male-male mounting behavior) from 9 to 14 mo of age. There was no difference in sexual behavior between immunized bulls (I2, I4, and I7.5) and bulls while held in lairage pens for 16 h before slaughter, but all treatment groups scored higher than steers. There was a similar trend for agonistic behavior, although I4 bulls were no different from steers. Prepubertal immunization against GnRH at 2, 4, and 7.5 mo of age impaired testes function and affected the development of social and sexual behavior of young bulls.

Aging↗
PubMed1986

Effect of male presence and of photoperiod on the sexual maturation of the field vole (Microtus agrestis).

The effect of mature males on the sexual development of young female and male field voles, reared in either long (stimulating) or short (inhibiting) photoperiods, was examined. Females reared in the presence of a mature male had a more advanced state of sexual maturation (as indicated by uterine weight) than did females reared in isolation from males, in long and short photoperiods (P less than 0.01). No interaction between photoperiod and male presence was found. Augmented uterine growth occurred not only when young females were separated from mature males by a wire mesh or solid metal screen but also when they were merely exposed to bedding previously used by mature males. Castrated males had no effect on the sexual development of females. The effect of mature males on the sexual development of young males was less clear, although there was some indication that the presence of adult males inhibited their sexual development in long and short photoperiods. For males and females, growth rate was stimulated by long photoperiod, but no effect of male presence on growth rate was found.

Animals↗
PubMed1993

The regulation of GTP-binding proteins during fertilization and zygote differentiation in Dictyostelium discoideum.

The development changes in GTP-binding proteins and the regulation of their appearance by calcium ions were investigated during early sexual development in Dictyostelium discoideum. GTP gamma S strongly inhibited gamete cell fusion, while GDP beta S slightly augmented it, suggesting that G-proteins have a critical role in cell fusion. A 52-kDa protein recognized by an anti-GTP-binding site-specific immune serum, was abundant during calcium-dependent early sexual development but decreased in amount concomitant with cell fusion. This protein remained at high levels in Ca(2+)-deficient cultures, suggesting that its down-regulation is linked to the events of sexual development. Analysis of substrates for cholera and pertussis toxin-mediated [32P]ADP-ribosylation in D. discoideum extracts determined that the 52-kDa protein is a G-alpha subunit similar to mammalian Gs. The 52-kDa protein was also detected in vegetative, asexual amoebae, but diminished rapidly within the first 2 h of starvation. Together these data indicate that the 52-kDa protein functions during the growth phase and is lost upon entry into either the sexual or asexual developmental programs. The amounts of several lower molecular weight GTP-binding proteins, ranging from 21- to 28 kDa, increased during the stage of zygote differentiation and their increases were calcium dependent. These data provide the first analysis of G-proteins during sexual development of D. discoideum and lay the foundation for continued analysis of the signal transduction events mediating cell fusion and zygote differentiation.

Adenosine Diphosphate Ribose↗
PubMed2005

The induction of the mating program in the phytopathogen Ustilago maydis is controlled by a G1 cyclin.

Our understanding of how cell cycle regulation and virulence are coordinated during the induction of fungal pathogenesis is limited. In the maize smut fungus Ustilago maydis, pathogenesis and sexual development are intricately interconnected. Furthermore, the first step in the infection process is mating, and this is linked to the cell cycle. In this study, we have identified a new G1 cyclin gene from U. maydis that we have named cln1. We investigated the roles of Cln1 in growth and differentiation in U. maydis and found that although not essential for growth, its absence produces dramatic morphological defects. We provide results that are consistent with Cln1 playing a conserved role in regulating the length of G1 and cell size, but also additional morphological functions. We also present experiments indicating that the cyclin Cln1 controls sexual development in U. maydis. Overexpression of cln1 blocks sexual development, while its absence enables the cell to express sexual determinants in conditions where wild-type cells were unable to initiate this developmental program. We conclude that Cln1 contributes to negative regulation of the timing of sexual development, and we propose the existence of a negative crosstalk between mating program and vegetative growth that may help explain why these two developmental options are incompatible in U. maydis.

Cyclic AMP-Dependent Protein Kinases↗
PubMed1998

The development of sexual risk taking in adolescence.

This chapter reviews literature from 1985 to the present that is focused on the development of sexual behaviors in adolescents, decision making about sexual behavior, and sexual risk-taking behaviors. Results show that sexual behavior is part of most people's lives from childhood through adulthood, and that the majority of adolescents begin to engage in sexual behaviors in their teenage years. Synthesis of this large body of research reveals a lack of theoretical frameworks to guide research in sexual risk taking, resulting in an incomplete understanding of the predictors of sexual risk-taking behavior in adolescents. New and broader approaches in the study of sexual risk taking are needed that include consideration of the social and developmental context from which adolescents make decisions about sexual behavior.

Adolescent↗
PubMed2002

Child sexual abuse: associations with the sexual functioning of adolescents and adults.

As we move into the 21st century, information about sex is widespread and more accessible to the general public than ever before. This interest in sex also increases the focus on symptoms and patterns associated with sexual problems. However, the etiology of sexual dysfunction is multifaceted and poorly understood. One factor that has received growing attention is the role that early sexual abuse plays in sexual development and later sexual functioning, and how these associations differ between males and females. Despite high prevalence rates of child sexual abuse (CSA), which occurs to approximately 1 in 3 females and 1 in 10 males under the age of 18, we do not completely understand the complexities of how and to what extent CSA affects sexual functioning. Nonetheless, the research highlights the need to recognize the potentially powerful influence that abusive childhood experiences contribute to sexual health, performance, and satisfaction. We review research on the relationship between CSA and adolescent and adult sexual functioning. We use a developmental framework to guide our understanding of the effects of CSA, as well as gender and ethnic differences, on the sexual functioning of male and female survivors.

Adaptation, Psychological↗