SAT-722 Structure-Based Discovery of Hydraulic Fracturing Chemicals as Novel Androgen Receptor Antagonists

Hydraulic fracturing (HF) technology is increasingly utilized for oil and gas extraction operations. The widespread use of HF has led to concerns of potential negative impacts on both the environment and human health. Indeed, the potential endocrine disrupting impacts of HF chemicals is one such knowledge gap. Herein, we used structure-based molecular docking to assess the binding affinities of 60 HF chemicals used in California to the human androgen receptor (AR). Five HF chemicals had relatively high AR binding affinity, suggesting the potential to disrupt AR effects. We next assessed androgenic and antiandrogenic activities of these chemicals in vitro. Of the five candidate AR ligands, only Genapol^® X–100 was found to significantly reduce the AR transactivation by 22%. To better understand the structural effect of Genapol^® X–100 on the potency of receptor inhibition, we compared the antiandrogenic activity of Genapol^® X–100 with that of its structurally similar chemical, Genapol^® X–080. Interestingly, both Genapol^® X–100 and Genapol^® X–080 elicited a significant antagonistic effect with 20% relative inhibitory concentrations (RIC₂₀) of 0.43 and 0.89 μM, respectively. This indicated that Genapol^® X–100 was more potent in inhibiting AR than Genapol^® X–080, consistent with longer Genapol^® X–100 chain length causing greater potency of AR activity inhibition. Furthermore, we investigated the mechanism of AR inhibition of these two chemicals in vitro. The result revealed that both Genapol^® X–100 and Genapol^® X–080 inhibited AR through noncompetitive binding mechanism. The effects of these two chemicals on the expression of AR responsive genes such as PSA, KLK2, and AR were also investigated. Genapol^® X–100 and Genapol^® X–080 notably altered the expression of these genes at relatively low concentrations of 0.5 µM to 1 µM. Using these integrated in vitro and in silico approaches, we identified HF chemicals as novel noncompetitive AR antagonists. Our findings heighten awareness of endocrine disruption by HF chemicals and provide evidence that noncompetitive antiandrogenic Genapol^® X–100 could possibly cause adverse endocrine health effects in humans.

Using fMRI connectivity to define a treatment-resistant form of post-traumatic stress disorder

A mechanistic understanding of the pathology of psychiatric disorders has been hampered by extensive heterogeneity in biology, symptoms, and behavior within diagnostic categories that are defined subjectively. We investigated whether leveraging individual differences in information-processing impairments in patients with post-traumatic stress disorder (PTSD) could reveal phenotypes within the disorder. We found that a subgroup of patients with PTSD from two independent cohorts displayed both aberrant functional connectivity within the ventral attention network (VAN) as revealed by functional magnetic resonance imaging (fMRI) neuroimaging and impaired verbal memory on a word list learning task. This combined phenotype was not associated with differences in symptoms or comorbidities, but nonetheless could be used to predict a poor response to psychotherapy, the best-validated treatment for PTSD. Using concurrent focal noninvasive transcranial magnetic stimulation and electroencephalography, we then identified alterations in neural signal flow in the VAN that were evoked by direct stimulation of that network. These alterations were associated with individual differences in functional fMRI connectivity within the VAN. Our findings define specific neurobiological mechanisms in a subgroup of patients with PTSD that could contribute to the poor response to psychotherapy.

Enlargement of thalamic nuclei in Tourette syndrome

CONTEXT

The basal ganglia and thalamus together connect in parallel closed-loop circuits with the cortex. Previous imaging studies have shown modifications of the basal ganglia and cortical targets in individuals with Tourette syndrome (TS), but less is known regarding the role of the thalamus in TS pathogenesis.

OBJECTIVE

To study the morphological features of the thalamus in children and adults with TS.

DESIGN

A cross-sectional, case-control study using anatomical magnetic resonance imaging.

SETTING

University research center.

PARTICIPANTS

The 283 participants included 149 with TS and 134 normal control individuals aged 6 to 63 years.

MAIN OUTCOME MEASURES

Conventional volumes and measures of surface morphology of the thalamus.

RESULTS

Analyses of conventional volumes and surface morphology were consistent in demonstrating an enlargement in TS-affected thalami. Overall volumes were 5% larger in the group composed of children and adults with TS. Statistical maps of surface contour demonstrated enlargement over the lateral thalamus. Post hoc testing indicated that differences in IQ, comorbid illnesses, and medication use did not account for these findings.

CONCLUSIONS

Morphological abnormalities in the thalamus, together with the disturbances reported in the sensorimotor cortex, striatum, and globus pallidus, support the hypothesis of a circuitwide disorder within motor pathways in TS. The connectivity and function of the numerous and diverse thalamic nuclei within cortical-subcortical circuits constitute an anatomical crossroad wherein enlargement of motor nuclei may represent activity-dependent hypertrophy within this component of cortical-subcortical motor circuits, or an adaptive response within a larger putative compensatory system that could thereby directly modulate activity in motor circuits to attenuate the severity of tics.

Basal ganglia surface morphology and the effects of stimulant medications in youth with attention deficit hyperactivity disorder

OBJECTIVE

Disturbances in the basal ganglia portions of cortico-striato-thalamo-cortical circuits likely contribute to the symptoms of attention deficit hyperactivity disorder (ADHD). The authors examined the morphologic features of the basal ganglia nuclei (caudate, putamen, and globus pallidus) in children with ADHD.

METHOD

A total of 104 individuals (combined-type ADHD patients: N=47; healthy comparison subjects: N=57), aged 7 to 18 years, were examined in a cross-sectional case-control study using anatomical magnetic resonance imaging. Conventional volumes and the surface morphology for the basal ganglia were measured.

RESULTS

Overall volumes were significantly smaller only in the putamen. Analysis of the morphological surfaces revealed significant inward deformations in each of the three nuclei, localized primarily in portions of these nuclei that are components of limbic, associative, and sensorimotor pathways in the cortico-striato-thalamo-cortical circuits in which these nuclei reside. The more prominent these inward deformations were in the patient group, the more severe the ADHD symptoms. Surface analyses also demonstrated significant outward deformations of all basal ganglia nuclei in the ADHD children treated with stimulants compared with those ADHD youth who were untreated. These stimulant-associated enlargements were in locations similar to the reduced volumes detected in the ADHD group relative to the comparison group. The outward deformations associated with stimulant medications attenuated the statistical effects of the primary group comparisons.

CONCLUSIONS

These findings potentially represent evidence of anatomical dysregulation in the circuitry of the basal ganglia in children with ADHD and suggest that stimulants may normalize morphological features of the basal ganglia in children with the disorder.

Morphological abnormalities of the thalamus in youths with attention deficit hyperactivity disorder

OBJECTIVE

The role of the thalamus in the genesis of attention deficit hyperactivity disorder (ADHD) remains poorly understood. The authors used anatomical MRI to examine the morphology of the thalamus in youths with ADHD and healthy comparison youths.

METHOD

The authors examined 46 youths with ADHD and 59 comparison youths 8-18 years of age in a cross-sectional case-control study. Conventional volumes and measures of surface morphology of the thalamus served as the main outcome measures.

RESULTS

A mixed-effects model comparing whole thalamic volumes revealed no significant differences between groups. Maps of the thalamic surface revealed significantly smaller regional volumes bilaterally in the pulvinar in youths with ADHD relative to comparison subjects. Post hoc analyses showed that ADHD patients who received stimulants (N=31) had larger conventional thalamic volumes than untreated youths with ADHD, and maps of the thalamic surface showed enlargement over the pulvinar in those receiving stimulants. Smaller regional volumes in the right lateral and left posterior thalamic surfaces were associated with more severe hyperactivity symptoms, whereas larger regional volumes in the right medial thalamic surfaces were associated with more severe symptoms of inattention.

CONCLUSION

These findings demonstrate reduced pulvinar volumes in youths with ADHD and indicate that this same area is relatively enlarged in patients treated with stimulants compared to those untreated. Associations of hyperactivity scores with smaller regional volumes on the lateral thalamic surface and inattention scores with larger regional volumes on the medial thalamic surface suggest the differential involvement of thalamic subcircuits in the pathogenesis of differing ADHD symptoms.

Changes in Mental Health in Adolescents with a History of Specific Language Impairment

Little is known about long-term mental health outcomes as individuals with specific language impairment (SLI) approach adulthood.

Aims:

This longitudinal study examined anxiety (Child Manifest Anxiety Scale; CMAS) and depression (Moods and Feelings Questionnaire; MFQ) during the critical period when adolescents finish compulsory education and then embark upon their chosen course of study or employment.

Method:

Eighty-nine adolescents with SLI and 90 typically developing (TD) peers were assessed during their final year of compulsory schooling (16 years) and one year later.

Results:

At 16 years, there is a greater risk of both anxiety and depression in adolescents with SLI compared to their peers. Group scores for adolescents with SLI were significantly higher on both the CMAS (p< .001) and the MFQ (p< .01). However, while this finding is replicated at 17 years for anxiety symptoms (p< .01), there is a significant decrease in depressive symptoms for adolescents with SLI across time such that risk of depression is comparable to TD peers at 17 years. Scores for TD adolescents remain remarkably stable across this period. Poor mental health symptoms were not related to measures of nonverbal IQ, language, literacy or sociability but were associated with higher levels of shyness.

Conclusion:

Notwithstanding a sustained, elevated risk of anxiety symptoms, there is an encouraging trend for a decrease in depressive symptoms as adolescents with SLI complete compulsory education. The findings are interpreted within a developmental psychopathology framework, focusing on the changing structure of intrapersonal and environmental processes that influence internalizing symptoms during mid-adolescence.

A 4,103 marker integrated physical and comparative map of the horse genome

A comprehensive second-generation whole genome radiation hybrid (RH II), cytogenetic and comparative map of the horse genome (2n = 64) has been developed using the 5000rad horse x hamster radiation hybrid panel and fluorescence in situ hybridization (FISH). The map contains 4,103 markers (3,816 RH; 1,144 FISH) assigned to all 31 pairs of autosomes and the X chromosome. The RH maps of individual chromosomes are anchored and oriented using 857 cytogenetic markers. The overall resolution of the map is one marker per 775 kilobase pairs (kb), which represents a more than five-fold improvement over the first-generation map. The RH II incorporates 920 markers shared jointly with the two recently reported meiotic maps. Consequently the two maps were aligned with the RH II maps of individual autosomes and the X chromosome. Additionally, a comparative map of the horse genome was generated by connecting 1,904 loci on the horse map with genome sequences available for eight diverse vertebrates to highlight regions of evolutionarily conserved syntenies, linkages, and chromosomal breakpoints. The integrated map thus obtained presents the most comprehensive information on the physical and comparative organization of the equine genome and will assist future assemblies of whole genome BAC fingerprint maps and the genome sequence. It will also serve as a tool to identify genes governing health, disease and performance traits in horses and assist us in understanding the evolution of the equine genome in relation to other species.

Hippocampus and amygdala morphology in attention-deficit/hyperactivity disorder

CONTEXT

Limbic structures are implicated in the genesis of attention-deficit/hyperactivity disorder (ADHD) by the presence of mood and cognitive disturbances in affected individuals and by elevated rates of mood disorders in family members of probands with ADHD.

OBJECTIVE

To study the morphology of the hippocampus and amygdala in children with ADHD.

DESIGN

A cross-sectional case-control study of the hippocampus and amygdala using anatomical magnetic resonance imaging.

SETTINGS

University research institute.

PATIENTS

One hundred fourteen individuals aged 6 to 18 years, 51 with combined-type ADHD and 63 healthy controls.

MAIN OUTCOME MEASURES

Volumes and measures of surface morphology for the hippocampus and amygdala.

RESULTS

The hippocampus was larger bilaterally in the ADHD group than in the control group (t = 3.35; P < .002). Detailed surface analyses of the hippocampus further localized these differences to an enlarged head of the hippocampus in the ADHD group. Although conventional measures did not detect significant differences in amygdalar volumes, surface analyses indicated the presence of reduced size bilaterally over the area of the basolateral complex. Correlations with prefrontal measures suggested abnormal connectivity between the amygdala and prefrontal cortex in the ADHD group. Enlarged subregions of the hippocampus tended to accompany fewer symptoms.

CONCLUSIONS

The enlarged hippocampus in children and adolescents with ADHD may represent a compensatory response to the presence of disturbances in the perception of time, temporal processing (eg, delay aversion), and stimulus seeking associated with ADHD. Disrupted connections between the amygdala and orbitofrontal cortex may contribute to behavioral disinhibition. Our findings suggest involvement of the limbic system in the pathophysiology of ADHD.

Construction of a medium-density horse gene map

A medium-density map of the horse genome (Equus caballus) was constructed using genes evenly distributed over the human genome. Three hundred and twenty-three exonic primer pairs were used to screen the INRA and the CHORI-241 equine BAC libraries by polymerase chain reaction and by filter hybridization respectively. Two hundred and thirty-seven BACs containing equine gene orthologues, confirmed by sequencing, were isolated. The BACs were localized to horse chromosomes by fluorescent in situ hybridization (FISH). Overall, 165 genes were assigned to the equine genomic map by radiation hybrid (RH) (using an equine RH(5000) panel) and/or by FISH mapping. A comparison of localizations of 713 genes mapped on the horse genome and on the human genome revealed 59 homologous segments and 131 conserved segments. Two of these homologies (ECA27/HSA8 and ECA12p/HSA11p) had not been previously identified. An enhanced resolution of conserved and rearranged chromosomal segments presented in this study provides clarification of chromosome evolution history.

Age, rapid-cycling, and pharmacotherapy effects on ventral prefrontal cortex in bipolar disorder: a cross-sectional study

BACKGROUND

Neuroimaging data suggest that deficits in ventral prefrontal cortex (VPFC) function in bipolar disorder (BD) progress during adolescence and young adulthood. However, the developmental trajectory of VPFC morphological abnormalities in BD is unknown. This study investigated potential age-dependent volume abnormalities in VPFC in BD.

METHODS

Thirty-seven individuals diagnosed with BD I (14 adolescents, 10 young adults and 13 older adults) and 56 healthy comparison subjects (HC) participated in imaging. Gray and white matter volumes of VPFC were measured using high-resolution structural magnetic resonance imaging (MRI). We used a mixed model, repeated measures analysis to examine VPFC volumes across age groups while co-varying for total brain volume. Potential effects of illness features including rapid-cycling and medication were explored.

RESULTS

VPFC volumes declined with age (p < .001). The diagnosis-by-age group interaction was significant (p = .01). Relative to HC subjects, VPFC gray and white matter volumes were significantly smaller in BD patients only in young adulthood (p = .04). In participants with BD, VPFC volumes were significantly smaller in participants with rapid-cycling than participants without rapid-cycling (p = .02). Conversely, current use of medication was associated with larger VPFC gray matter volumes (p = .005), independent of age.

CONCLUSIONS

These preliminary findings suggest the presence of a more rapid initial decline in VPFC volumes with age in adolescents and young adults with BD than HC. These findings also suggest that the rapid-cycling subtype of BD is associated with larger VPFC volume deficits than the non-rapid-cycling subtype, and that pharmacotherapy may have trophic or protective effects on VPFC volumes in BD patients.

A critical review of the validity of ego development theory and its measurement

Loevinger's (1976) theory of ego development represents an important and original approach to understanding personality development. More than 20 years have elapsed since the last substantial critical review of the validity of the theory and its measurement (Loevinger, 1979). Our article provides an updated critical review of the theory by reviewing the considerable body of research that has accumulated over the past 20 years. This review addresses the construct, predictive, and discriminant validity of ego development theory and the Washington University Sentence Completion Test (WUSCT; Loevinger & Wessler, 1970; Loevinger, Wessler, & Redmore, 1970) as its measurement. We conclude that there is substantial empirical support for the conceptual soundness of ego development theory and the WUSCT.

Novel adenosine A1 receptor antagonists. Synthesis and structure-activity relationships of a novel series of 3-(2-cyclohexenyl-3-oxo-2,3-dihydropyridazin-6-yl)-2-phenylpyrazolo[1,5 -a]pyridines

A novel series of 3-(2-cyclohexenyl-3-oxo-2,3-dihydropyridazin-6-yl)-2-phenylpyrazol o[1,5-a]pyridines was synthesized and evaluated for in vitro adenosine A1 and A2A receptor binding activities. Most of the cyclohexenyl derivatives (7a-e, 8a-s) were found to be potent adenosine A1 receptor antagonists. In a series of analogues of FR166124 (3a), alcohol 7c, nitrile 7e and amide derivatives (7d, 8c, 8r) were found to be more potent A1 antagonists with higher A2A/A1 selectivity than FR166124. Amongst them, 8r showed considerable water solubility (33.3 mg/mL), but lower than that of the sodium salt of FR166124 (> 200 mg/mL). Additionally, FR166124 had strong diuretic activity by both p.o. and iv administration in rats (minimum effective dose=0.1 and 0.032 mg/kg, respectively).

Discovery of FR166124, a novel water-soluble pyrazolo-[1,5-a]pyridine adenosine A1 receptor antagonist

Novel 3-(2-cycloalkyl and cycloalkenyl-3-oxo-2,3-dihydropyridazin-6-yl)-2-phenylpyrazo lo [1,5-a]-pyridines were synthesized and evaluated for their adenosine A1 receptor binding activities. In this series, FR166124 (3) was found to be the most potent and selective adenosine A1 receptor antagonist, and the double bond of the cyclohexenyl acetic acid group was essential for selectivity of A1 receptor binding. Furthermore, the solubility in water of the sodium salt of FR 166124 was high.

Adolescent reputation enhancement: differentiating delinquent, nondelinquent, and at-risk youths

This research reports the findings of two studies conducted to measure and then investigate differences between delinquent, nondelinquent, and at-risk youths' orientations towards reputation enhancement. In the first study, concerning item selection and scale development, the factor structure and content validity of a potential Reputation Enhancement Scale were tested by examining the item responses of the scale completed by 230 high-school students. In the second study, the scale was validated by comparing the item responses of 80 delinquent, 90 at-risk, and 90 nondelinquent adolescents with the responses of the original students. The instrument was found to be reliable (alphas from .64 to .92), indicating that the factors are dependable across different samples, and the coefficients of congruence were sufficiently high to investigate meaningful group differences. Three second-order factors (Conforming Reputation, Nonconforming Reputation, Self-presentation) were derived from the 15 first-order factors. Although multivariate analyses revealed significant differences between the reputational orientations of delinquent, at-risk, and nondelinquent participants, the self-presentation second-order factor did not differentiate the three groups.

Belief term development in children with autism, Asperger syndrome, specific language impairment, and normal development: links to theory of mind development

This study examined the relationship between the development of theory of mind and the development of the belief terms think, know, and guess. Children with autism and Asperger syndrome, matched to children with specific language impairment and normal development, completed false belief, belief term comprehension, and belief term expression tasks. The autistic group's performance on the false belief, belief term comprehension, and belief term expression tasks was significantly poorer than that of the Asperger, language impaired, and normal groups. Across groups an association was found between false belief and belief term performance. Results support a growing body of literature demonstrating links between the development of theory of mind and communicative competence.

Amateur tattooing practices and beliefs among high school adolescents

PURPOSE

The objective of this research was to investigate the reasons, experiences, methods, and perceived health consequences of obtaining tattoos among a sample of Western Australian high school adolescents.

METHODS

Information pertaining to levels of health awareness and school social behavior were obtained. Data were gathered in two phases using a questionnaire and follow-up interviews.

RESULTS

Findings revealed that over 13% of participants had acquired tattoos and that the majority had been self-administered with crude implements. Some participants identified possible methods of removal, with a small number having attempted removal, again using crude implements.

CONCLUSIONS

Statistical analyses revealed a number of significant main effects for gender, age, and tattoo status on the dependent variables for health awareness and school social behavior.

Public health aspects of tattooing among Australian adults

Medical, criminological and psychiatric literatures have pointed to risks associated with tattooing, but most of this work has been conducted with samples which have other known risk factors or disturbances. This paper investigates the reasons, experiences, methods, and perceived consequences of obtaining tattoos among a sample of Australian adults. The findings complement, extend and in some respects contrast with earlier research. Like other researchers, we found that most people acquire tattoos when they are relatively young. Unlike earlier research, we did not find widespread dissatisfaction and regret. Sex differences emerged in location and design of tattoos. A majority of tattooed people report awareness of others' negative stereotypes of them.

Television and sex-role acquisition. 1: Content

Television has earned considerable public and academic criticism in recent years for the alleged bias in its sex-role content. A fundamental concern of many critics is with the representation of male and female roles that confronts children. This paper reviews the evidence accumulating from numerous content analyses of both adult and children's television. Overall, the evidence confirms that there are marked differences in the ways the medium presents the sexes. These differences are both quantitative and qualitative but the general pattern at either level is to present males as dominant and females as nurturant and complementary. Some qualifications, exceptions and gaps in the literature are discussed. The paper is the first of a three-part review series of television and sex-role acquisition: the subsequent papers will review respectively the effects of sex-stereotyped TV content upon children and the prospects for counter-stereotyped programmes aiming to modify young viewers' beliefs and attitudes.

An improved technique for the study of lymph nodes in surgical specimens

The importance of the meticulous study by pathologists of the lymph nodes in surgical specimens is emphasized. Most pathologists identify only a small proportion of the lymph nodes in these specimens and valuable prognostic information is lost. Data illustrating the evolution in the Columbia Laboratory of surgical pathology of methods used to study surgical lymph node specimens over a 44-year period (1935--1979) are reviewed. An improved method of clearing the specimens of axillary dissections in radical mastectomy finds more lymph nodes and more metastases, and greatly shortens the time required for clearing. The importance of identifying metastases in the interpectoral nodes is emphasized. In a special study with our new clearing technique metastases were found in the interpectoral nodes in 19% of the radical mastectomy specimens. These nodes are not removed in the modified operation, which does not include resection of the pectoral muscles. The opportunity to cure a substantial proportion of patients is thus lost.