Dissociation As a Mechanism of Risk for Interpersonal Victimization Among Adolescent Girls

Childhood interpersonal violence exposure (IVE) is associated with repeated victimization in adolescence and adulthood. Research suggests dissociation, a psychological phenomenon characterized by alterations and disruptions to consciousness, memory, and perceptions of the environment, and out-of-body experiences, increases the risk of revictimization. Self-report data from a longitudinal study of 92 violence-exposed adolescent girls from a large, urban area were analyzed to assess whether dissociation predicts polyvictimization or exposure to multiple types of interpersonal violence across adolescence. Participants' mental and interpersonal health was assessed at four in-person laboratory visits scheduled across 3.5 years (i.e., T1-T4). IVE included direct or indirect victimization experienced at home, school, the neighborhood, or town, such as child maltreatment, domestic violence, peer victimization, dating aggression, and community violence. Polyvictimization was operationalized as a composite score of the different types of IVE endorsed by the participant or caregiver. A random-intercept cross-lagged panel model was used to test the bidirectional relationships between dissociation and polyvictimization longitudinally. Cross-lagged regressions were analyzed to determine whether dissociation and polyvictimization predicted subsequent dissociation symptoms and polyvictimization. Concurrent and previous dissociation significantly accounted for polyvictimization at T2, T3, and T4. Polyvictimization did not significantly predict future dissociation symptoms. The results from this study provide support for dissociation's unique contribution to polyvictimization among violence-exposed girls, making it an important target for clinical assessment and treatment.

Psychometric Properties of the Sexual Subjectivity Inventory among Lesbian, Gay, and Bisexual Emerging Adults

Research highlights the significance of positive sexual self-perceptions for general and sexual health. Yet, most research on the sexuality of lesbian, gay, and bisexual (LGB) individuals has been risk-oriented, leaving a critical gap in knowledge about normative and healthy sexuality among sexual minorities. In part, this gap is due to a lack of sexual health measures with established psychometric properties for LGB individuals. The current study examined the factor structure, reliability, factorial invariance, and validity of the Sexual Subjectivity Inventory (SSI) in a sample of 746 lesbian (n = 123), gay (n = 204), and bisexual (n _females = 234; n _males = 185) emerging adults (M_age = 23.4 years). Factor analyses revealed the same five-factor structure found in similar aged heterosexual samples and strict factorial invariance by sexual and cisgender identities. Factor scores were internally consistent and associated with indicators of sexual well-being (i.e., safe sex self-efficacy, internalized homonegativity) and general well-being (life satisfaction, identity achievement) in theoretically meaningful ways. Sexual subjectivity was largely unrelated to health risk behavior. Results support the use of the SSI with LGB emerging adults for advancing holistic perspectives on LGB sexuality.

Romantic Conflict Narratives in Emerging Adult Couples: Viewpoint and Gender Matter

Healthy romantic relationships entail understanding the needs of the self and other when interpreting conflict events. Yet how couples make meaning around specific conflicts and their capacity to reflect on their own and their partners' unmet needs is understudied. Using narratives, we examined destructive (e.g., extreme anger and break-up anxiety) and constructive (e.g., perspective taking) interpretations of past romantic conflicts in 80 emerging adult heterosexual couples and the extent to which such interpretations varied by viewpoint and gender. Couple members were interviewed separately about two conflict episodes in which their partner did not meet their needs (victim viewpoint) and two episodes in which they did not meet their partners' needs (perpetrator viewpoint). As anticipated, destructive interpretations were more evident in the victim viewpoint and for female couple members. In contrast, within constructive interpretations, the use of insight was greater in the perpetrator than the victim viewpoint. Although perspective taking was expected to be more common in the perpetrator viewpoint and in female narratives, this was not the case, as this type of constructive interpretation was infrequent in narratives about conflict. The findings revealed aspects of meaning making that might be useful to mental health professionals concerned with building skills to improve romantic competence in emerging adult couples.

Caregivers as gatekeepers: Professional mental health service use among urban minority adolescents

Mental illness among adolescents frequently goes untreated, especially among low income and ethnic minority families. We sought to examine parent and adolescent psychological factors influencing mental health service use among 120 urban adolescents (82% African American, Age 13-18 years, M = 14.29, SD = 1.52) who had access to mental health treatment through their community primary care setting. We utilized structural equation modeling (SEM) to explore the independent and combined associations among parent and adolescent variables hypothesized to be associated with the youth's engagement in mental health treatment. Results showed that more than half (63.6%) of youth with clinically significant levels of symptoms were not currently engaged in treatment or seeking mental health services. One latent variable emerged: caregivers' perceptions of adolescent mental health problems (consisted of youth psychological symptoms, youth functional impairment, and strain on caregiver). Together with caregivers' attitude toward professional help, these two caregiver-reported variables, but not adolescents' attitude, were associated with higher likelihood of service utilization among adolescents. Findings suggest caregivers functioned as the "gatekeepers" to mental health services. We discuss findings' implications for engaging youth in mental health services as well as study limitations and future directions. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Onset Trajectories of Sexting and Other Sexual Behaviors Across High School: A Longitudinal Growth Mixture Modeling Approach

Sexting is receiving substantial scholarly attention and is now considered commonplace in adolescence. Little is known, however, about the normative contexts and the development of adolescent sexting behavior, including the initiation of sexting in relation to other sexual behaviors. In this study, we used growth mixture modeling to identify classes of onset trajectories for sexual behaviors across high school. Participants included 429 high school students (54% female) who completed annual assessments of sexual behavior over a three-year period. We identified four distinct classes: postponement (9%) with no behaviors other than hand-holding and kissing initiated by Grade 11, gradual onset (44%) with sexting and other sexual behaviors emerging incrementally across high school, continuous onset (32%) with sexting and other sexual behaviors within the first three years of high school, early onset (15%) with initiation of sexting and all other sexual behaviors prior to or by the end of Grade 9. Boys were more likely than girls to be members of the postponement versus gradual onset class, while Black students were more likely than White students to be members of the early versus gradual onset class. Sexting behavior appears to be common in adolescence and co-emerges with genital contact behavior across varying trajectories of sexual development. These findings provide the foundation for contextualizing sexting within normative sexual development. Further, this information can inform efforts to promote sexual health.

A Dyadic Perspective on Sexual Subjectivity and Romantic Relationship Functioning

Sexual subjectivity is a central feature of healthy sexuality that is believed to shape and be shaped by relationship experiences. However, no studies have examined sexual subjectivity within a dyadic context. The current study examined partner similarity in sexual subjectivity within 75 heterosexual couples and associations with sexual relationship functioning using actor-partner interdependence models. Within couples, partners' scores were significantly correlated on three of five elements of sexual subjectivity and showed similar mean levels on four of the five elements. Men's and women's sexual self-efficacy were positively associated with their own sexual communication. Other associations varied by gender. Men's sexual body esteem and entitlement to self-pleasure predicted their reports of sexual relationship functioning, and women's entitlement to pleasure from partners and sexual reflection predicted their reports of relationship functioning. Few partner effects were observed. Findings suggest that partners' sexual subjectivity is relevant for dyadic functioning in emerging adulthood. Longitudinal research is needed to examine how experiences within and across relationships contribute to the development of sexual self-concepts and sexual functioning.

Longitudinal Relations Between Childhood Maltreatment, Maltreatment-Specific Shame, and Postpartum Psychopathology

The persistence of shame-based reactions to child maltreatment (CM) has been associated with poor posttraumatic adjustment. Despite evidence that the postpartum period is a vulnerable time for women with CM histories, little is known about the consequences of maltreatment-specific (MS) shame for postpartum functioning. The current study examined individual differences in MS shame among a sample of women during the postpartum period ( n = 100) as well as prospective relations from MS shame to postpartum psychopathology at 6-, 12-, 15-, and 18-month postpartum. Linear growth curve (LGC) analyses showed that MS shame predicted higher levels of depression symptoms but not post-traumatic stress disorder (PTSD) symptoms at all time points whereas path analyses showed that shame mediated the relations from multi-maltreatment to both depression and PTSD symptoms at all time points. Results point to the long-term consequences of MS shame during postpartum and the importance of attending to shame in clinical care of maltreatment survivors who present with postpartum psychopathology.

Caregivers' abuse stigmatization and their views of mental health treatment following child sexual abuse

Many families do not utilize mental health services after the discovery of child sexual abuse (CSA), even when trauma-focused treatments are offered at low or no cost. Non-offending caregivers frequently serve as gatekeepers to youths' treatment, and their reactions to CSA may figure into decisions about treatment engagement. The current study examined caregivers' abuse stigmatization (i.e., self-blame and shame about their children's CSA) and associations with two factors predictive of treatment engagement (motivation, obstacles). Participants were recruited from a Child Advocacy Center where they received forensic interviews and were offered services following CSA discovery. Participating caregiver-child dyads included 52 non-offending caregivers (83% biological parents) and their children (69% girls; M_age=10.94, SD_age=2.62). Caregiver abuse stigmatization was associated with higher motivation for treatment but also more obstacles to treatment. Further, abuse stigmatization moderated associations between children's PTSD symptoms and perceived obstacles to treatment with medium effect sizes (M f²=0.287). Among caregivers experiencing high abuse stigmatization, greater child PTSD symptoms were associated with more obstacles to treatment. Among caregivers experiencing low stigmatization, child PTSD was either associated with fewer treatment obstacles or was unrelated to treatment obstacles. Results highlight the potential significance of reducing parents' abuse stigmatization for increasing mental health service utilization following CSA discovery, especially for more symptomatic youth.

Attentional Bias for Sexual Threat Among Sexual Victimization Survivors: A Meta-Analytic Review

The current meta-analysis examined the effects of sexual victimization (SV) on attentional bias for sexual threat. This relationship was also examined among victims of SV with and without a current diagnosis of post-traumatic stress disorder (PTSD). The broader aim was to elucidate potential mechanisms operating between SV and negative health outcomes. As hypothesized, the findings supported a positive relationship between SV and attentional bias toward sexual threat stimuli, and subanalyses indicated that PTSD symptomatology significantly contributed to this association.

Perceptions of general and parenting-specific posttraumatic change among postpartum mothers with histories of childhood maltreatment

Although adaptive meanings of childhood maltreatment (CM) are critical to posttraumatic adaptation, little is known about perceptions of posttraumatic change (PTC) during the vulnerable postpartum period. PTC may be positive or negative as well as global or situational. This study examined general and parenting-specific PTC among 100 postpartum women with CM histories (Mage=29.5 years). All reported general and 83% reported parenting PTC. General PTC were more likely to include negative and positive changes; parenting PTC were more likely to be exclusively positive. Indicators of more severe CM (parent perpetrator, more CM experiences) were related to parenting but not general PTC. Concurrent demographic risk moderated associations between number of CM experiences and positive parenting PTC such that among mothers with more CM experiences, demographic risk was associated with stronger positive parenting PTC. Results highlight the significance of valence and specificity of PTC for understanding meanings made of CM experiences.

Early Stigmatization, PTSD, and Perceived Negative Reactions of Others Predict Subsequent Strategies for Processing Child Sexual Abuse

OBJECTIVE

Trauma processing is central to healthy recovery, but few studies examine how youth process experiences of child sexual abuse (CSA). The current study builds on our prior work identifying individual differences in CSA processing strategies (i.e., Constructive, Absorbed, Avoidant) to examine whether abuse stigmatization, PTSD symptoms, and negative reactions from others experienced during the year after abuse discovery were associated with subsequent CSA processing strategies.

METHOD

Participants included 160 ethnically diverse youth (8-15 years, 73% female) with confirmed cases of CSA. Predictors were measured at abuse discovery (T1) and 1 year later (T2). Individual differences in CSA processing strategies were assessed 6 years after discovery (T3) from participants' abuse narratives.

RESULTS

The persistence of abuse stigmatization from T1 to T2 significantly increased the odds of using either an Avoidant or Absorbed (vs. Constructive) strategy at T3. Higher levels of PTSD symptoms at T1 as well as their persistence from T1 to T2 each significantly increased the odds of having an Absorbed versus Constructive strategy. The persistence of perceived negative reactions from others from T1 to T2 increased the odds of an Absorbed versus Avoidant strategy. Effect sizes ranged from medium to large (M d = 0.636).

CONCLUSIONS

Results further validate prior work identifying distinct CSA processing strategies and suggest the persistence of abuse-specific disruptions over the year after abuse discovery may be associated with subsequent problems processing CSA experiences.

Positive and Negative Posttraumatic Change Following Childhood Sexual Abuse Are Associated With Youths' Adjustment

Meanings made of childhood sexual abuse (CSA) experiences are important to psychosocial adjustment. The current study examined adolescents' and young adults' perceptions of posttraumatic change (PTC) in the self, relationships, sexuality, and worldviews attributed to prior CSA experiences. We sought to document the prevalence of positive and negative PTC and examine their unique and joint associations with psychosocial adjustment. Participants included 160 youth with confirmed cases of CSA (73% female; 8-14 years at abuse discovery) who were part of a longitudinal study of the long-term effects of CSA. Six years after discovery, youth were interviewed about their abuse experiences. Interviews were coded for the valence and strength of PTC. The majority of youth reported PTC, and negative changes were more frequent and stronger than positive changes. Controlling for age, gender, abuse severity, and negative PTC, positive PTC was associated with lower abuse stigmatization for all youth. Controlling for age, gender, abuse severity, and positive PTC, negative PTC was associated with greater abuse stigmatization, post-traumatic stress disorder, sexual problems, and dating aggression for all youth. Relations of positive PTC with depression and support from friends and romantic partner were moderated by negative PTC, such that positive PTC was associated with better adjustment for youth with low versus high levels of negative PTC. Results highlight the importance of both negative and positive PTC for understanding meanings made of CSA experiences and their implications for psychosocial adjustment and intervention.

Naturalistically observed conflict and youth asthma symptoms

OBJECTIVE

To investigate the links between naturalistically observed conflict, self-reported caregiver-youth conflict, and youth asthma symptoms.

METHOD

Fifty-four youth with asthma (age range: 10-17 years) wore the Electronically Activated Recorder (EAR) for a 4-day period to assess interpersonal conflict and caregiver-youth conflict as they occur in daily life. Conflict also was assessed with baseline self-report questionnaires and daily diaries completed by youth participants and their caregivers. Asthma symptoms were assessed using daily diaries, baseline self-reports, and wheezing, as coded from the EAR.

RESULTS

EAR-observed measures of conflict were strongly associated with self-reported asthma symptoms (both baseline and daily diaries) and wheezing coded from the EAR. Further, when entered together in regression analyses, youth daily reports of negative caregiver-youth interactions and EAR-observed conflict uniquely predicted asthma symptoms; only EAR-observed conflict was associated with EAR-observed wheezing.

CONCLUSION

These findings demonstrate the potential impact of daily conflict on youth asthma symptoms and the importance of assessing conflict as it occurs in everyday life. More broadly, they point to the importance of formulating a clear picture of family interactions outside of the lab, which is essential for understanding how family relationships "get under the skin" to affect youth health.

Negative life events and non-suicidal self-injury in an adolescent inpatient sample

Although life stressors have been implicated in the aetiology of various forms of psychopathology related to non-suicidal self-injury (NSSI), particularly depression and suicidal behavior, they have rarely been examined in relation with NSSI. The objective of the current study was to assess the association between life stressors and NSSI in adolescent inpatients. Adolescent inpatients (n = 110) completed measures of life events, NSSI, and depressive symptoms at 3 time-points over a 9-month period. Higher rates of life stressors were significantly associated with greater NSSI. This finding held even after covarying concurrent depressive symptoms and gender. Life stressors may have a unique role in the pathogenesis of NSSI. Directions for future research and clinical implications are discussed.

Potential pathways from stigmatization and externalizing behavior to anger and dating aggression in sexually abused youth

Although experiencing childhood sexual abuse (CSA) puts youth at risk for involvement in relationship violence, research is limited on the potential pathways from CSA to subsequent dating aggression. The current study examined prospective pathways from externalizing behavior problems and stigmatization (abuse-specific shame and self-blame attributions) to anger and dating aggression. One hundred sixty youth (73% female, 69% ethnic/racial minorities) with confirmed CSA histories were interviewed at the time of abuse discovery (T1, when they were 8-15 years of age), and again 1 and 6 years later (T2 and T3). Externalizing behavior and abuse-specific stigmatization were assessed at T1 and T2. Anger and dating aggression were assessed at T3. The structural equation model findings supported the proposed relations from stigmatization following the abuse to subsequent dating aggression through anger. Only externalizing behavior at T1 was related to later dating aggression, and externalizing was not related to subsequent anger. This longitudinal research suggests that clinical interventions for victims of CSA be sensitive to the different pathways by which youth come to experience destructive conflict behavior in their romantic relationships.

Temporal relationship between substance use and delinquent behavior among young psychiatrically hospitalized adolescents

There is considerable evidence linking substance use and delinquent behavior among adolescents. However, the nature and temporal ordering of this relationship remain uncertain, particularly among early adolescents and those with significant psychopathology. This study examined the temporal ordering of substance use and delinquent behavior in a sample of psychiatrically hospitalized early adolescents. Youth (N = 108) between the ages of 12 and 15 years completed three assessments over 18 months following hospitalization. Separate cross-lagged panel models examined the reciprocal relationship between delinquent behavior and two types of substance use (e.g., alcohol and marijuana). Results provided evidence of cross-lagged effects for marijuana: Delinquent behavior at 9 months predicted marijuana use at 18 months. No predictive effects were found between alcohol use and delinquent behavior over time. Findings demonstrate the stability of delinquent behavior and substance use among young adolescents with psychiatric concerns. Furthermore, results highlight the value of examining alcohol and marijuana use outcomes separately to better understand the complex pathways between substance use and delinquent behavior among early adolescents.

Romantic partner selection and socialization of young adolescents' substance use and behavior problems

This study examined romantic partner selection and socialization of substance use (cigarettes, alcohol) and behavior problems among a sample of 78 young adolescents (6th-8th graders) over eleven months. Adolescent and romantic partner behaviors were assessed before and after relationships were initiated via school records and self-report. Most selection and socialization effects were apparent for the eighth grade adolescents (at Time 1). Prior to their relationship, eighth graders and romantic partners were alike on alcohol use. In contrast, romantic socialization effects emerged for eighth graders' cigarette use and behavior problems. The nature of the partner socialization effects depended on the combination of adolescents' and partners' pre-relationship behaviors. Eighth graders who dated partners with fewer problems showed the greatest instability in their behavior problems and partner behavior predicted greater decreased in problem behaviors among adolescents with more problems. The implications of these findings are discussed within the broader context of adolescent peer relationships.

Making meaning of traumatic events: youths' strategies for processing childhood sexual abuse are associated with psychosocial adjustment

The need to make meaning of childhood sexual abuse (CSA) is common and often persists long after the abuse ends. Although believed to be essential for healthy recovery, there is a paucity of research on how youth process their CSA experiences. The current study identified individual differences in the ways youth process their CSA and examined associations with psychosocial adjustment. A sample of 108 youth with confirmed abuse histories enrolled in the study within 8 weeks of abuse discovery, when they were between 8 and 15 years old. Six years later, they participated in interviews about their CSA experiences, reactions, and perceived effects. Using a coding system developed for this study, youths' CSA narratives were reliably classified with one of three processing strategies: Constructive (13.9%), Absorbed (50%), or Avoidant (36.1%). Absorbed youth reported the highest levels of psychopathological symptoms, sexual problems, and abuse-specific stigmatization, whereas Constructive youth tended to report the fewest problems. Avoidant youth showed significantly more problems than Constructive youth in some but not all areas. Interventions that build healthy processing skills may promote positive recovery by providing tools for constructing adaptive meanings of the abuse, both in its immediate aftermath and over time.

Abuse-specific self-schemas and self-functioning: a prospective study of sexually abused youth

Potential pathways from childhood sexual abuse (CSA) to negative self-schemas to subsequent dissociative symptoms and low global self-esteem were examined in a prospective longitudinal study of 160 ethnically diverse youth with confirmed CSA histories. Participants were interviewed at the time of abuse discovery, when they were 8 to 15 years of age, and again 1 and 6 years later. Abuse-specific indicators of stigmatization, in particular the combination of shame and self-blame more than general self-blame attributions for everyday events, explained which youth with CSA histories experienced more dissociative symptoms and clinically significant levels of dissociation. Abuse-specific stigmatization was found to operate as a prospective mechanism for subsequent dissociative symptoms but not self-esteem.

Interparental Conflict and Adolescents' Romantic Relationship Conflict

This study examined associations between interparental conflict and adolescents' romantic relationship conflict. High school seniors (N=183) who lived with married parents completed questionnaires about their parents' marriage and their own romantic relationships. A subset of 88 adolescents was also observed interacting with their romantic partners. Adolescents' perceptions and appraisals of interparental conflict were related to the amount of conflict in romantic relationship and adolescents' conflict styles. Adolescents' appraisals of interparental conflict (i.e., self-blame, perceived threat) moderated many of the associations between interparental conflict and conflict behavior with romantic partners. The patterns of moderated effects differed by gender. These findings suggest that the meanings boys and girls ascribe to interparental conflict are important for understanding how family experiences contribute to the development of romantic relationships.

Childhood sexual abuse, stigmatization, internalizing symptoms, and the development of sexual difficulties and dating aggression

Potential pathways from childhood sexual abuse (CSA) to subsequent romantic intimacy problems were examined in a prospective longitudinal study of 160 ethnically diverse youth with confirmed CSA histories. Participants were interviewed at the time of abuse discovery, when they were 8-15 years of age, and again 1-6 years later. Stigmatization (abuse-specific shame and self-blame) and internalizing symptoms (posttraumatic stress and depressive symptoms), more than abuse severity, explained which youth with CSA histories experienced more sexual difficulties and dating aggression. Stigmatization was found to operate as a predictive mechanism for subsequent sexual difficulties. Internalizing symptoms were not predictive of romantic intimacy problems, although they did show correlational relations with sexual difficulties and dating aggression. Early interventions such as trauma-focused cognitive-behavioral therapy that target stigmatization may be important for preventing the development of sexual difficulties in CSA youth.

Romantic partner selection and socialization during early adolescence

This prospective study examined romantic partner selection and socialization among a sample of 78 young adolescents (6th-8th graders). Independent assessments of adolescent and romantic partner adjustment were collected before and after relationships initiated via peer nomination and self-report. Prior to their relationship, adolescents and partners were significantly alike on popularity, physical attraction, and depressive symptoms. Controlling for initial similarity, partners' popularity, depressive symptoms, relational aggression, and relational victimization significantly predicted changes in adolescents' functioning in these areas over time. However, the magnitude and direction of change varied according to adolescents' and partners' prerelationship functioning. In general, adolescents who dated high-functioning partners changed more than those who dated low-functioning partners, and partner characteristics predicted greater change among low- versus high-functioning adolescents. Results were consistent even when controlling for best friend characteristics. The current findings are among the first to demonstrate unique contributions of romantic partner characteristics to adolescents' psychosocial functioning.

Sexual anxiety and eroticism predict the development of sexual problems in youth with a history of sexual abuse

Youth with confirmed histories of sexual abuse (N = 118) were followed longitudinally to examine associations between their initial sexual reactions to abuse and subsequent sexual functioning. Participants were interviewed at abuse discovery (ages 8 through 15) and again 1 and 6 years later. Eroticism and sexual anxiety emerged as distinct indices of abuse-specific sexual reactions and predicted subsequent sexual functioning. Eroticism was associated with indicators of heightened sexuality, including more sexual risk behavior and views of sexual intimacy focused on partners' needs. Sexual anxiety was associated with indicators of diminished sexuality, including few sexual partners and avoidant views of sexual intimacy. Age at abuse discovery moderated some associations, suggesting that the timing of abuse-specific reactions affects trajectories of sexual development. Findings point to the need for a developmental approach to understanding how abuse-specific sexual reactions disrupt sexual development and the need for early interventions promoting healthy sexual development.

Actor and partner effects of adolescents' romantic working models and styles on interactions with romantic partners

The present study examined how adolescents' and their romantic partners' romantic working models and relational styles were related to their interactions with each other. Sixty-five couples (M age = 18.1 years) were observed interacting. Romantic working models were assessed in interviews about their romantic experiences; romantic styles were assessed by self-report. Data were analyzed using the Actor Partner Interdependence Model. Working models of romantic relationships, especially girls' models, were predictive of their behavior, the partners' behavior, and the dyads' behavior. Fewer links were found between relational styles and observed behavior. The present study extends past work by showing that representations of romantic relationships influence or are influenced by romantic interactions, even as these representations and relationships are just developing.

Adolescent girls' interpersonal vulnerability to depressive symptoms: a longitudinal examination of reassurance-seeking and peer relationships

A transactional, interpersonal framework involving adolescents' reassurance-seeking and peer experiences may be useful for understanding the emergence of gender differences in depression prevalence during the adolescent transition. Sociometric nominations of peer acceptance/rejection and ratings of friendship quality provided by adolescents and their friends were used to measure peer experiences among 6th-8th-grade adolescents (N=520) over 3 annual time points. After controlling for age and pubertal development, significant but small prospective effects offered mixed support for hypotheses: (a) depressive symptoms and negative peer relations predicted increasing levels of girls' reassurance-seeking; (b) initial levels of reassurance-seeking and depressive symptoms predicted deteriorating friendship quality among girls and low friendship stability, respectively; and (c) reassurance-seeking combined with poor peer experiences predicted increases in girls' depressive symptoms.

Concordance in attachment states of mind and styles with respect to fathers and mothers

It is believed that by adulthood, independent attachments to the mother and the father coalesce into a single state of mind with respect to attachment. If true, states of mind with respect to mothers and fathers should be concordant. Fifty-six young adults were administered two versions of the Adult Attachment Interview, each of which asked about their relationship with one parent. State of mind with respect to the father was significantly related to state of mind with respect to the mother, as were attachment styles regarding the two parents. Perceptions of attachment styles were not very related to corresponding states of mind but were related to inferred loving from a parent.

Adolescents' working models and styles for relationships with parents, friends, and romantic partners

This study examined the links among adolescents' representations of their relationships with parents, friends, and romantic partners. Sixty-eight adolescents were interviewed three times to assess their working models for each of these types of relationships. Working models of friendships were related to working models of relationships with parents and romantic partners. Working models of relationships with parents and romantic partners were inconsistently related. A similar pattern of results was obtained for self-report measures of relational styles for the three types of relationships. Perceived experiences were also related. Specifically, support in relationships with parents tended to be related to support in romantic relationships and friendships, but the latter two were unrelated. On the other hand, self and other controlling behaviors in friendships were related to corresponding behaviors in romantic relationships. Negative interactions in the three types of relationships also tended to be related. Taken together, the findings indicate that the representations of the three types of relationships are distinct, yet related. Discussion focuses on the nature of the links among the three.

Contrasting effects oft10,c12- andc9,t11-conjugated linoleic acid isomers on the fatty acid profiles of mouse liver lipids

The purpose of this study was to examine the effects of two purified isomers of CLA (c9,t11-CLA and t10,c12-CLA) on the weights and FA compositions of hepatic TG, phospholipids, cholesterol esters, and FFA. Eight-week-old female mice (n = 6/group) were fed either a control diet or diets supplemented with 0.5% c9,t11-CLA or t10,c12-CLA isomers for 8 wk. Weights of liver total lipids and those of individual lipid fractions did not differ between the control and the c9,t11-CLA groups. Livers from animals fed the t10, c12-CLA diet contained four times more lipids than those of the control group; this was mainly due to an increase in the TG fractions (fivefold), but cholesterol (threefold), cholesterol esters (threefold), and FFA (twofold) were also significantly increased. Although c9,t11-CLA did not significantly alter the weights of liver lipids when compared with the control group, its intake was associated with significant reductions in the weight percentage (wt% of total FAME) of 18:1n-9 and 18:1n-7 in the TG fraction and with significant increases in the weight percentage of 18:2n-6 in the TG, cholesterol ester, and phospholipid fractions. On the other hand, t10,c12-CLA intake was linked with a significant increase in the weight percentage of 18:1n-9 and a decrease in that of 18:2n-6 in all lipid fractions. These changes may be the result of alterations in the activity of delta9-desaturase (stearoyl CoA desaturase) and the enzymes involved in the metabolism of 18:2n-6. Thus, the two isomers differed not only in their effects on the weights of total liver lipids and lipid fractions but also on the FA profile of the lipid fractions.

Trans-10,cis-12 CLA increases liver and decreases adipose tissue lipids in mice: possible roles of specific lipid metabolism genes

Although consumption of CLA mixtures has been associated with several health effects, less is known about the actions of specific CLA isomers. There is evidence that the t10,c12-CLA isomer is associated with alterations in body and organ weights in animals fed CLA, but the mechanisms leading to these changes are unclear. The purpose of this study was to determine the effects of two commonly occurring isomers of CLA on body composition and the transcription of genes associated with lipid metabolism. Eight-week-old female mice (n = 11 or 12/group) were fed either a control diet or diets supplemented with 0.5% c9,t11-CLA or t10,c12-CLA isomers or 0.2% of the peroxisome proliferator-activated receptor alpha (PPARalpha) agonist fenofibrate for 8 wk. Body and retroperitoneal adipose tissue weights were significantly lower (6-10 and 50%, respectively), and liver weights were significantly greater (100%) in the t10,c12-CLA and the fenofibrate groups compared with those in the control group; body and tissue weights in the c9,t11-CLA group did not differ from those in the control group. Livers from animals in the t10,c12-CLA group contained five times more lipids than in the control group, whereas the lipid content of the fenofibrate group did not differ from that in the control group. Although fenofibrate increased the mRNA for PPARalpha, t10,c12-CLA decreased it. These results suggest that PPARalpha did not mediate the effects of t10,c12-CLA on body composition. The CLA isomers and fenofibrate altered mRNA levels for several proteins involved in lipid metabolism, but the most striking difference was the reduction of mRNA for leptin and adiponectin in the t10,c12-CLA group. These initial results suggest that changes associated with energy homeostasis and insulin action may mediate the effects of t10,c12-CLA on lipid metabolism.

Similar effects of c9,t11-CLA and t10,c12-CLA on immune cell functions in mice

Published results regarding the effects of CLA on immune cell functions have ranged from stimulation to inhibition. In those studies, a mixture of CLA isomers were used, and food intake was not controlled. We have examined whether the discrepancies in the results of earlier studies may be due to the lack of controlled feeding and whether the two isomers of CLA may differ in their effects on immune cell functions. Three groups of C57BL/6 female mice were fed either a control, c9,t11-CLA-, or t10,c12-CLA (0.5 wt%)-supplemented diet, 5 g/d, for 56 d. At the end of the study, the number of immune cells in spleens, bone marrows, or in circulation; proliferation of splenocytes in response to T and B cell mitogens; and prostaglandin secretion in vitro did not differ among the three groups. Both CLA isomers significantly increased in vitro tumor necrosis factor alpha and interleukin (IL)-6 secretion and decreased IL-4 secretion by splenocytes compared to those in the control group. Thus, the two CLA isomers had similar effects on all response variables tested. The discrepancies among the results from previous studies did not seem to be caused by the differences in the isomer composition of CLA used.

Dietary supplementation with conjugated linoleic acid increased its concentration in human peripheral blood mononuclear cells, but did not alter their function

The purpose of this study was to examine if conjugated linoleic acid (CLA) supplementation of diets would alter fatty acid (FA) composition and function of peripheral blood mononuclear cells (PBMC). Seventeen women, 20-41 yr, participated in a 93-d study conducted at the Metabolic Research Unit. The same diet (19, 30, and 51% energy from protein, fat, and carbohydrate, respectively) was fed to all subjects throughout the study. Seven subjects (control group) supplemented their diet with six daily capsules (1 g each) of placebo oil (sunflower) for 93 d. For the other 10 subjects (CLA group), the supplement was changed to an equivalent amount of Tonalin capsules for the last 63 d of the study. Tonalin provided 3.9 g/d of a mixture of CLA isomers (trans-10,cis-12, 22.6%; cis-11,trans-13, 23.6%; cis-9,trans-11, 17.6%; trans-8,cis-10, 16.6%; other isomers 19.6%), and 2.1 g/d of other FA. PBMC isolated on study days 30 and 90 were used to assess intracellular cytokines by flow cytometry, secreted cytokines, and eicosanoid by enzyme-linked immonosorbent assay, and FA composition by gas-liquid chromatography. After supplementation, total CLA concentration increased from 0.012 to 0.97% (P < 0.0001) in PBMC lipids, but it did not significantly alter the concentration of other FA. CLA supplementation did not alter the in vitro secretion of prostaglandin E2, leukotriene B4, interleukin-1beta (IL-1beta), or tumor necrosis factor alpha (TNFalpha) by PBMC simulated with lipopolysaccharide, and the secretion of IL-2 by PBMC stimulated with phytohemagglutinin. Nor did it alter the percentage T cells producing IL-2, interferon gamma, and percentage of monocytes producing TNFalpha. The intracellular concentration of these cytokines was also not altered. None of the variables tested changed in the control group. Our results show that CLA supplementation increased its concentration in PBMC lipids, but did not alter their functions.

Determination of serum levels of thirteen human immunodeficiency virus-suppressing drugs by high-performance liquid chromatography

Two high-performance liquid chromatographic methods using UV detection are presented for the determination of two different groups (A and B) of drugs used in the suppression of human immunodeficiency virus (HIV). Group A is comprised of six nucleosidic reverse transcriptase inhibitors, viz. zalcitabine, lamivudine, stavudine, didanosine, zidovudine and ziagen. Group B consists of seven drugs four of which are protease inhibitors (PIs) and three of which are non-nucleosidic reverse transcriptase inhibitors (NNRTIs). The PIs are: indinavir, nelfinavir, saquinavir and ritonavir. The NNRTIs are: nevirapine, delavirdine and efavirenz. Groups A and B require separate aliquots of serum for extraction and must be chromatographed separately.

Amiodarone-associated changes in human neutrophils

Amiodarone and its major metabolite, desethylamiodarone, were measured in the plasma, white blood cells (WBCs) and red blood cells (RBCs) of 14 patients receiving chronic amiodarone therapy. The mean plasma concentrations (+/- standard error of the mean) of amiodarone and desethylamiodarone were 2.4 +/- 0.6 and 1.6 +/- 0.4 microgram/ml, respectively. The drug level in the WBCs was 62 +/- 12 micrograms/g protein during the early loading phase and 106 +/- 33 micrograms/g protein during maintenance phase of amiodarone therapy. Desethylamiodarone concentration in the WBCs was 42 +/- 18 and 190 +/- 33 micrograms/g protein during the loading and maintenance phases, respectively. Although a trend in WBC to plasma concentration was seen, there was no linear correlation between these levels. In 1 patient with severe neuropathy, biopsy of the nerve and muscle showed high concentrations of both amiodarone and desethylamiodarone. Although there was a decrease in tissue drug levels, proportionately high tissue:plasma drug levels were detected at the time of necropsy approximately 6.5 months after amiodarone was discontinued in this patient. Neutrophils from all patients receiving chronic amiodarone therapy showed multiple myelin-like polymorphic inclusion bodies (onionoid bodies) upon electron microscopic examination. Our observations suggest that WBC drug concentrations and electron microscopic changes may provide a means of correlating tissue concentrations and of following patients receiving chronic amiodarone therapy.

Pharmacokinetics, antiarrhythmic effects, and tissue concentrations of amiodarone and desethylamiodarone in dogs with acute coronary artery occlusion

A single bolus of 5 or 40 mg/Kg of amiodarone was injected 24 hours after inducing coronary artery occlusion in the closed-chest dog preparation. Plasma pharmacokinetic profile was determined and the calculated t1/2 beta of 3.5 +/- 2.8 and 3.2 +/- 0.6 hour after 5 or 40 mg/Kg dose, respectively, were obtained. The major metabolite, desethylamiodarone, was detected within 15 minutes of the single bolus of amiodarone. At 6 hours after amiodarone administration, the animals were killed and tissue concentrations of amiodarone and desethylamiodarone were measured. Two additional peaks in the HPLC chromatograms were observed in plasma and tissue samples of most dogs given 40 mg/Kg I.V. amiodarone and these most likely are due to unidentified metabolites of the drug. The highest drug concentration was found in the lungs. Tissue to plasma drug rations suggested that accumulation of amiodarone and perhaps desethylamiodarone was different for different tissues. Ventricular arrhythmias were not abolished by either of the two doses of amiodarone; however, there was a gradual and statistically significant decrease in the number of ventricular premature beats and ventricular tachycardia beats over the six-hour period after a single 40 mg/Kg I.V. bolus. At the time of reduction in the arrhythmia frequency, tissue levels of both amiodarone and desethylamiodarone in the border and infarct zone of the myocardium were approximately 50% as high as in the normal zone. Plasma drug levels did not correlate well with tissue concentrations. However, there was an excellent correlation between drug levels in WBCs and various tissues except the lung. It is concluded that amiodarone is rapidly metabolized into desethylamiodarone and at least two other unidentified compounds; a large dose of amiodarone is necessary to produce some decrease in ventricular arrhythmias associated with acute coronary artery occlusion; tissue concentrations may be better correlated with drug levels in WBCs than in plasma, and coronary artery occlusion does not affect acute pharmacokinetic profile of the drug.