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1.
Psychol Men Masc ; 24(3): 261-268, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38044977

RESUMO

Objectives: Participation in sports can increase young adults' risk for heavy alcohol use and related consequences. Among student-athletes, more men report heavy drinking than women. These gender differences may reflect men's expression of masculinity which can encompass excessive consumption. While a growing body of research indicates that general masculine norms are positively associated with alcohol use and consequences among men, the extent to which alcohol-specific masculine norms can increase student-athletes' risk for elevated drinking and related outcomes is not yet known. Thus, we examined how masculine drinking norms are associated with alcohol use and related consequences while accounting for demographics and multiple dimensions of general masculine norms. Methods: 1,825 NCAA student-athletes (White=79%, Mage=20.1/SDage=1.3; 50 colleges/universities) completed a confidential online survey which included questions regarding masculine drinking norms of excess and control and conformity to general masculine norms. Results: We created latent constructs and tested a path model in SEM. Results indicated that, after accounting for demographics and multiple dimensions of general masculine norms, the masculine drinking norm of excess was positively associated with alcohol use and consequences. Conversely, control was negatively related to alcohol use but unrelated to consequences. Compared to control and other dimensions of general masculine norms, excess was most strongly related to alcohol use and consequences. Conclusions: A move from assessing general masculine norms toward alcohol-specific masculine norms can further researchers' and practitioners' knowledge of masculine norms and their link to drinking behaviors, and enhance the application of masculine norms in alcohol intervention and prevention programs.

2.
Subst Use Misuse ; 57(6): 886-896, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35321617

RESUMO

BackgroundDespite the known negative consequences of exercise addiction and preliminary evidence suggesting that it may co-occur with other health risk behaviors, no studies to date have examined exercise addiction among college students in conjunction with disordered eating behaviors and alcohol use. The aim of this study was to describe which college students are most at-risk for co-occurring health risk behaviors to enhance the efficiency of health risk prevention efforts. Method: Guided by multidimensional theories of impulsivity and substance use models of comorbidity, this study used latent profile analysis to examine whether separate, conceptually meaningful profiles of risk for exercise addiction, disordered eating behaviors, and alcohol use would emerge among 503 college students from a large public university. Results: The best-fitting model supported three profiles. MANOVA results revealed significant profile differences based on exercise addiction, binge eating, purging, laxative/pill/diuretic use, exercising longer than 60 minutes, negative urgency, and problematic alcohol use. Profile 3 students (n = 29), labeled the Affect Driven Health Risk-Takers, demonstrated the highest levels of impulsivity (i.e., negative urgency, lack of premeditation, lack of perseverance, and sensation seeking) and the most risk behaviors compared to the other two profiles. Profile membership was associated with distinct levels of negative urgency, exercise addiction, disordered eating behaviors, and problematic alcohol use. A small proportion of undergraduates demonstrated co-occurring exercise addiction, disordered eating behaviors, and problematic alcohol use. Profile membership also predicted the health outcomes of clinically significant exercise addiction and hazardous alcohol use. Conclusions: Findings illuminated how patterns of risk behavior engagement were associated with clinically significant exercise addiction and hazardous alcohol use and will inform prevention efforts and clinical interventions with at-risk college students.


Assuntos
Transtornos da Alimentação e da Ingestão de Alimentos , Comportamento Impulsivo , Consumo de Bebidas Alcoólicas/epidemiologia , Transtornos da Alimentação e da Ingestão de Alimentos/epidemiologia , Humanos , Estudantes , Universidades
3.
Subst Use Misuse ; 55(5): 796-805, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-31876218

RESUMO

Background: The present study proposed a moderated mediation model of relations among negative urgency, sensation seeking, alcohol use, self-esteem, and casual sexual behavior among college students. We hypothesized students' alcohol use would mediate a positive relation between two facets of impulsivity, negative urgency and sensation seeking, with casual sexual behavior. We also examined the influence of self-esteem on alcohol use and casual sexual behavior to determine if self-esteem may serve as a point of intervention. We hypothesized that self-esteem might moderate the relation between casual sexual behavior and alcohol use, such that students who report high alcohol use in addition to low self-esteem would engage in more casual sexual behavior than individuals who report relatively higher levels of self-esteem. Methods: Data were collected in 2015 from 413 undergraduate students at a large Northeastern public university. Structural equation modeling tested the moderated mediation model. Results: Contrary to hypotheses, the theorized model demonstrated an inadequate fit to the data when self-esteem was included. A second structural model was calculated to test alcohol use as a mediator of associations between negative urgency and sensation seeking, and casual sexual behavior. As hypothesized, students' alcohol use was found to be a mediator of the positive associations between negative urgency and casual sexual behavior and sensation seeking and casual sexual behavior. Conclusions: Findings suggest that alcohol use, negative urgency, and sensation seeking may serve as points of intervention to address casual sexual behavior, as appropriate, among college student populations.


Assuntos
Consumo de Bebidas Alcoólicas , Autoimagem , Comportamento Sexual , Estudantes , Humanos , Comportamento Impulsivo , Sensação , Universidades
4.
J Ethn Subst Abuse ; 19(2): 253-270, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-30540548

RESUMO

Relations among gender, ethnicity, athlete seasonal status, alcohol consumption, and protective behavioral strategies were examined among student-athletes. The national sample (N = 670, Mage = 18.90) included Black (n = 199), Hispanic (n = 236), and White (n = 235) college student-athletes who use alcohol. There were significant gender and ethnic differences in alcohol consumption as well as gender differences in use of protective behavioral strategies. Within-group gender differences in alcohol use and PBS were present for White and Hispanic but not Black student-athletes. Implications for tailored prevention/intervention efforts and future directions are discussed.


Assuntos
Consumo de Álcool na Faculdade/etnologia , Alcoolismo/etnologia , Atletas/estatística & dados numéricos , Negro ou Afro-Americano/etnologia , Comportamentos Relacionados com a Saúde/etnologia , Hispânico ou Latino/estatística & dados numéricos , Comportamento de Redução do Risco , População Branca/etnologia , Adolescente , Adulto , Feminino , Humanos , Masculino , Estudantes/estatística & dados numéricos , Universidades/estatística & dados numéricos , Adulto Jovem
5.
J Ethn Subst Abuse ; : 1-19, 2020 Nov 18.
Artigo em Inglês | MEDLINE | ID: mdl-33208047

RESUMO

Hispanic college students at the U.S.-Mexico border are at higher risk for alcohol use and negative drinking consequences relative to their counterparts in non-border areas. Hispanic students at the U.S.-Mexico border (N = 219, Mage = 20.14; 71.2% women) completed an online survey. U.S. orientation was negatively associated with alcohol consumption. Enhancement motives predicted alcohol consumption, whereas coping and conformity motives predicted negative drinking-related consequences. Cultural orientations did not moderate the relations between social motives and alcohol use outcomes. Results highlight the need to consider alcohol-related cognition and to better contextualize U.S. and heritage cultural orientations among Hispanics in the U.S.-Mexico areas.

6.
J Virol ; 92(14)2018 07 15.
Artigo em Inglês | MEDLINE | ID: mdl-29695435

RESUMO

The retroviral Gag protein is the main structural protein responsible for virus particle assembly and release. Like human immunodeficiency virus type 1 (HIV-1) Gag, human T-cell leukemia virus type 1 (HTLV-1) has a structurally conserved capsid (CA) domain, including a ß-hairpin turn and a centralized coiled-coil-like structure of six α helices in the CA amino-terminal domain (NTD), as well as four α-helices in the CA carboxy-terminal domain (CTD). CA drives Gag oligomerization, which is critical for both immature Gag lattice formation and particle production. The HIV-1 CA CTD has previously been shown to be a primary determinant for CA-CA interactions, and while both the HTLV-1 CA NTD and CTD have been implicated in Gag-Gag interactions, our recent observations have implicated the HTLV-1 CA NTD as encoding key determinants that dictate particle morphology. Here, we have conducted alanine-scanning mutagenesis in the HTLV-1 CA NTD nucleotide-encoding sequences spanning the loop regions and amino acids at the beginning and ends of α-helices due to their structural dissimilarity from the HIV-1 CA NTD structure. We analyzed both Gag subcellular distribution and efficiency of particle production for these mutants. We discovered several important residues (i.e., M17, Q47/F48, and Y61). Modeling implicated that these residues reside at the dimer interface (i.e., M17 and Y61) or at the trimer interface (i.e., Q47/F48). Taken together, these observations highlight the critical role of the HTLV-1 CA NTD in Gag-Gag interactions and particle assembly, which is, to the best of our knowledge, in contrast to HIV-1 and other retroviruses.IMPORTANCE Retrovirus particle assembly and release from infected cells is driven by the Gag structural protein. Gag-Gag interactions, which form an oligomeric lattice structure at a particle budding site, are essential to the biogenesis of an infectious virus particle. The CA domain of Gag is generally thought to possess the key determinants for Gag-Gag interactions, and the present study has discovered several critical amino acid residues in the CA domain of HTLV-1 Gag, an important cancer-causing human retrovirus, which are distinct from that of HIV-1 as well as other retroviruses studied to date. Altogether, our results provide important new insights into a poorly understood aspect of HTLV-1 replication that significantly enhances our understanding of the molecular nature of Gag-Gag interaction determinants crucial for virus particle assembly.


Assuntos
Proteínas do Capsídeo/metabolismo , Capsídeo/metabolismo , Produtos do Gene gag/química , Produtos do Gene gag/metabolismo , Infecções por HTLV-I/virologia , Vírion/patogenicidade , Montagem de Vírus , Capsídeo/química , Proteínas do Capsídeo/química , Produtos do Gene gag/genética , Infecções por HTLV-I/metabolismo , Células HeLa , Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Humanos , Modelos Moleculares , Mutação , Domínios Proteicos , Produtos do Gene gag do Vírus da Imunodeficiência Humana
7.
PLoS Pathog ; 13(12): e1006800, 2017 12.
Artigo em Inglês | MEDLINE | ID: mdl-29281741

RESUMO

Intracellular infection and multi-organ colonization by the protozoan parasite, Trypanosoma cruzi, underlie the complex etiology of human Chagas disease. While T. cruzi can establish cytosolic residence in a broad range of mammalian cell types, the molecular mechanisms governing this process remain poorly understood. Despite the anticipated capacity for fatty acid synthesis in this parasite, recent observations suggest that intracellular T. cruzi amastigotes may rely on host fatty acid metabolism to support infection. To investigate this prediction, it was necessary to establish baseline lipidome information for the mammalian-infective stages of T. cruzi and their mammalian host cells. An unbiased, quantitative mass spectrometric analysis of lipid fractions was performed with the identification of 1079 lipids within 30 classes. From these profiles we deduced that T. cruzi amastigotes maintain an overall lipid identity that is distinguishable from mammalian host cells. A deeper analysis of the fatty acid moiety distributions within each lipid subclass facilitated the high confidence assignment of host- and parasite-like lipid signatures. This analysis unexpectedly revealed a strong host lipid signature in the parasite lipidome, most notably within its glycerolipid fraction. The near complete overlap of fatty acid moiety distributions observed for host and parasite triacylglycerols suggested that T. cruzi amastigotes acquired a significant portion of their lipidome from host triacylglycerol pools. Metabolic tracer studies confirmed long-chain fatty acid scavenging by intracellular T. cruzi amastigotes, a capacity that was significantly diminished in host cells deficient for de novo triacylglycerol synthesis via the diacylglycerol acyltransferases (DGAT1/2). Reduced T. cruzi amastigote proliferation in DGAT1/2-deficient fibroblasts further underscored the importance of parasite coupling to host triacylglycerol pools during the intracellular infection cycle. Thus, our comprehensive lipidomic dataset provides a substantially enhanced view of T. cruzi infection biology highlighting the interplay between host and parasite lipid metabolism with potential bearing on future therapeutic intervention strategies.


Assuntos
Interações Hospedeiro-Parasita/fisiologia , Metabolismo dos Lipídeos , Triglicerídeos/metabolismo , Trypanosoma cruzi/crescimento & desenvolvimento , Trypanosoma cruzi/metabolismo , Animais , Células Cultivadas , Doença de Chagas/metabolismo , Doença de Chagas/parasitologia , Diacilglicerol O-Aciltransferase/metabolismo , Ácidos Graxos/metabolismo , Humanos , Metaboloma , Camundongos , Trypanosoma cruzi/patogenicidade
8.
J Couns Psychol ; 66(6): 678-689, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31204835

RESUMO

Little is known about what predicts student service members' and veterans' (SSM/V) adjustment to college. In qualitative research, SSM/V report feeling they do not belong and are misunderstood by college communities, a phenomenon that counseling psychologists call cultural incongruity. The goal of the current study was to quantitatively examine the relationship between cultural incongruity and adjustment to college. We surveyed 814 SSM/V about their adjustment to college using the Student Adaptation to College Questionnaire. Cultural incongruity was operationalized in two ways: feelings of not belonging were measured via direct report and the association with adjustment to college assessed with regression. Feelings of being misunderstood about academic barriers were assessed by comparing SSM/V's perceptions of academic barriers and SSM/V's perceptions of how others view the SSM/V's academic barriers and the association with adjustment was assessed using polynomial regression and response surface analysis. Cultural incongruity predicted adjustment to college. After controlling for other known predictors, feelings of not belonging accounted for 18% of the variance in adjustment to college. Polynomial regression showed that feeling understood about academic barriers protected against the negative impact of the barrier on adjustment to college. Cultural incongruity predicts adjustment to college for SSM/V. Helping SSM/V feel their unique barriers to college adjustment are understood may blunt the impact of these barriers. (PsycINFO Database Record (c) 2019 APA, all rights reserved).


Assuntos
Características Culturais , Motivação , Autorrelato , Estudantes/psicologia , Universidades , Veteranos/psicologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Estudos Transversais , Emoções/fisiologia , Feminino , Previsões , Humanos , Pessoa de Meia-Idade , Motivação/fisiologia , Apoio Social , Adulto Jovem
9.
Psychol Men Masc ; 20(2): 238-251, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31592191

RESUMO

From 2010 to 2014, HIV diagnoses among Latino men who have sex with other men (LMSM) have increased by 14%, while diagnoses declined by 11% among white, non-Latino MSM. This health disparity is in part due to exposure to other LMSM with undiagnosed HIV infections. To effectively engage LMSM who are unaware of their serostatus, profiles of men differing in theorized determinants of HIV testing must be considered. In this retrospective study, we examined data from 546 LMSM to investigate whether hypothesized individual- (traditional masculine gender role conformity; sexual identity development status; alcohol and illicit drug use; sexual risk behaviors; perceived HIV susceptibility; and HIV stigma) and community-based (HIV prevention programming, access to health care, social support, neighborhood collective efficacy) factors were associated with differences in HIV testing. Latent profile analysis was used to identify profiles of men, and subsequent analyses examined whether profiles exhibited differential proportions of HIV testing. Four latent profiles were observed. One profile (50.3% tested) differed markedly from all other profiles (5.1 to 11% tested) in HIV testing. Characteristics of participants in this unique profile included reporting lower levels of heterosexual self-presentation, sexual identity uncertainty (and high levels of sexual identity commitment), condom use, HIV stigma, education, and perceived HIV susceptibility than all other profiles. Findings could improve HIV testing rates among LMSM by specifying ways in which public health advertisements/campaigns and community-based testing outreach efforts could be tailored to men most at-risk for transmitting HIV due to unknown serostatus.

10.
J Virol ; 91(14)2017 07 15.
Artigo em Inglês | MEDLINE | ID: mdl-28446667

RESUMO

The capsid domain (CA) of the retroviral Gag protein is a primary determinant of Gag oligomerization, which is a critical step for immature Gag lattice formation and virus particle budding. Although the human immunodeficiency virus type 1 (HIV-1) CA carboxy-terminal domain (CTD) is essential for CA-CA interactions, the CA CTD has been suggested to be largely dispensable for human T-cell leukemia virus type 1 (HTLV-1) particle biogenesis. To more clearly define the roles of the HTLV-1 CA amino-terminal domain (NTD) and CA CTD in particle biogenesis, we generated and analyzed a panel of Gag proteins with chimeric HIV-1/HTLV-1 CA domains. Subcellular distribution and protein expression levels indicated that Gag proteins with a chimeric HIV-1 CA NTD/HTLV-1 CA CTD did not result in Gag oligomerization regardless of the parent Gag background. Furthermore, chimeric Gag proteins with the HTLV-1 CA NTD produced particles phenotypically similar to HTLV-1 immature particles, highlighting the importance of the HTLV-1 CA NTD in HTLV-1 immature particle morphology. Taken together, these observations support the conclusion that the HTLV-1 CA NTD can functionally replace the HIV-1 CA CTD, but the HIV-1 CA NTD cannot replace the HTLV-1 CA CTD, indicating that the HTLV-1 CA subdomains provide distinct contributions to Gag-Gag oligomerization, particle morphology, and biogenesis. Furthermore, we have shown for the first time that HIV-1 and HTLV-1 Gag domains outside the CA (e.g., matrix and nucleocapsid) impact Gag oligomerization as well as immature particle size and morphology.IMPORTANCE A key aspect in virus replication is virus particle assembly, which is a poorly understood process for most viruses. For retroviruses, the Gag structural protein is the primary driver of virus particle biogenesis, and the CA CTD is the primary determinant of Gag-Gag interactions for HIV-1. In this study, the HTLV-1 capsid amino-terminal domain was found to provide distinct contributions to Gag-Gag oligomerization, particle morphology, and biogenesis. This study provides information that will aid efforts for discovery of therapeutic targets for intervention.


Assuntos
Proteínas do Capsídeo/metabolismo , Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Multimerização Proteica , Montagem de Vírus , Produtos do Gene gag do Vírus da Imunodeficiência Humana/metabolismo , Proteínas do Capsídeo/genética , Linhagem Celular , Humanos , Domínios Proteicos , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo , Produtos do Gene gag do Vírus da Imunodeficiência Humana/genética
11.
Mol Microbiol ; 101(2): 299-313, 2016 07.
Artigo em Inglês | MEDLINE | ID: mdl-27062185

RESUMO

Purine salvage by Leishmania is an obligatory nutritional process that impacts both cell viability and growth. Previously, we have demonstrated that the removal of purines in culture provokes significant metabolic changes that enable Leishmania to survive prolonged periods of purine starvation. In order to understand how Leishmania sense and respond to changes in their purine environment, we have exploited several purine pathway mutants, some in which adenine and guanine nucleotide metabolism is uncoupled. While wild type parasites grow in any one of a variety of naturally occurring purines, the proliferation of these purine pathway mutants requires specific types or combinations of exogenous purines. By culturing purine pathway mutants in high levels of extracellular purines that are either permissive or non-permissive for growth and monitoring for previously defined markers of the adaptive response to purine starvation, we determined that adaptation arises from a surveillance of intracellular purine nucleotide pools rather than from a direct sensing of the extracellular purine content of the environment. Specifically, our data suggest that perturbation of intracellular adenine-containing nucleotide pools provides a crucial signal for inducing the metabolic changes necessary for the long-term survival of Leishmania in a purine-scarce environment.


Assuntos
Nucleotídeos de Adenina/metabolismo , Leishmania donovani/metabolismo , Purinas/metabolismo , Adenina/metabolismo , Guanina/metabolismo , Nucleotídeos de Guanina/metabolismo , Nucleotídeos de Purina/metabolismo , Purinas/química , Inanição
12.
J Virol ; 90(18): 8074-84, 2016 09 15.
Artigo em Inglês | MEDLINE | ID: mdl-27356903

RESUMO

UNLABELLED: The Gag protein is the main retroviral structural protein, and its expression alone is usually sufficient for production of virus-like particles (VLPs). In this study, we sought to investigate-in parallel comparative analyses-Gag cellular distribution, VLP size, and basic morphological features using Gag expression constructs (Gag or Gag-YFP, where YFP is yellow fluorescent protein) created from all representative retroviral genera: Alpharetrovirus, Betaretrovirus, Deltaretrovirus, Epsilonretrovirus, Gammaretrovirus, Lentivirus, and Spumavirus. We analyzed Gag cellular distribution by confocal microscopy, VLP budding by thin-section transmission electron microscopy (TEM), and general morphological features of the VLPs by cryogenic transmission electron microscopy (cryo-TEM). Punctate Gag was observed near the plasma membrane for all Gag constructs tested except for the representative Beta- and Epsilonretrovirus Gag proteins. This is the first report of Epsilonretrovirus Gag localizing to the nucleus of HeLa cells. While VLPs were not produced by the representative Beta- and Epsilonretrovirus Gag proteins, the other Gag proteins produced VLPs as confirmed by TEM, and morphological differences were observed by cryo-TEM. In particular, we observed Deltaretrovirus-like particles with flat regions of electron density that did not follow viral membrane curvature, Lentivirus-like particles with a narrow range and consistent electron density, suggesting a tightly packed Gag lattice, and Spumavirus-like particles with large envelope protein spikes and no visible electron density associated with a Gag lattice. Taken together, these parallel comparative analyses demonstrate for the first time the distinct morphological features that exist among retrovirus-like particles. Investigation of these differences will provide greater insights into the retroviral assembly pathway. IMPORTANCE: Comparative analysis among retroviruses has been critically important in enhancing our understanding of retroviral replication and pathogenesis, including that of important human pathogens such as human T-cell leukemia virus type 1 (HTLV-1) and HIV-1. In this study, parallel comparative analyses have been used to study Gag expression and virus-like particle morphology among representative retroviruses in the known retroviral genera. Distinct differences were observed, which enhances current knowledge of the retroviral assembly pathway.


Assuntos
Produtos do Gene gag/metabolismo , Produtos do Gene gag/ultraestrutura , Retroviridae/genética , Virossomos/metabolismo , Virossomos/ultraestrutura , Membrana Celular/química , Núcleo Celular/química , Microscopia Crioeletrônica , Produtos do Gene gag/genética , Células HeLa , Humanos , Microscopia Confocal , Microscopia Eletrônica de Transmissão , Virossomos/genética
13.
PLoS Pathog ; 10(2): e1003938, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24586154

RESUMO

The ability of Leishmania to survive in their insect or mammalian host is dependent upon an ability to sense and adapt to changes in the microenvironment. However, little is known about the molecular mechanisms underlying the parasite response to environmental changes, such as nutrient availability. To elucidate nutrient stress response pathways in Leishmania donovani, we have used purine starvation as the paradigm. The salvage of purines from the host milieu is obligatory for parasite replication; nevertheless, purine-starved parasites can persist in culture without supplementary purine for over three months, indicating that the response to purine starvation is robust and engenders parasite survival under conditions of extreme scarcity. To understand metabolic reprogramming during purine starvation we have employed global approaches. Whole proteome comparisons between purine-starved and purine-replete parasites over a 6-48 h span have revealed a temporal and coordinated response to purine starvation. Purine transporters and enzymes involved in acquisition at the cell surface are upregulated within a few hours of purine removal from the media, while other key purine salvage components are upregulated later in the time-course and more modestly. After 48 h, the proteome of purine-starved parasites is extensively remodeled and adaptations to purine stress appear tailored to deal with both purine deprivation and general stress. To probe the molecular mechanisms affecting proteome remodeling in response to purine starvation, comparative RNA-seq analyses, qRT-PCR, and luciferase reporter assays were performed on purine-starved versus purine-replete parasites. While the regulation of a minority of proteins tracked with changes at the mRNA level, for many regulated proteins it appears that proteome remodeling during purine stress occurs primarily via translational and/or post-translational mechanisms.


Assuntos
Leishmania donovani/genética , Leishmania donovani/metabolismo , Proteoma/metabolismo , Estresse Fisiológico/fisiologia , Cromatografia Líquida , Humanos , Purinas/metabolismo , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Espectrometria de Massas em Tandem
14.
J Hered ; 106(3): 315-21, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25779972

RESUMO

Iguana delicatissima is an endangered endemic of the Lesser Antilles in the Caribbean. Phylogeographic analyses for many terrestrial vertebrate species in the Caribbean, particularly lizards, suggest ancient divergence times. Often, the closest relatives of species are found on the same island, indicating that colonization rates are so low that speciation on islands is often more likely to generate biodiversity than subsequent colonization events. Mitochondrial sequence analysis of the region spanning ND4 was performed on I. delicatissima individuals from islands across the species' range to estimate genetic divergence among geographically isolated populations. Five unique haplotypes were recovered from 46 individuals. The majority of animals carry a single common haplotype. Two of the haplotypes were only present in individuals classified as hybrids from Îles des Saintes. The final 2 haplotypes, single nucleotide substitutions, were present in animals from Îlet Chancel of Martinique and Saint Barthélemy, respectively. Despite the great distances between islands and habitat heterogeneity within islands, this species is characterized by low haplotype diversity. The low mtDNA variation of I. delicatissima suggests a single colonization coupled with rapid range expansion, potentially hastened by human-mediated dispersal.


Assuntos
Variação Genética , Genética Populacional , Iguanas/genética , Animais , Região do Caribe , Conservação dos Recursos Naturais , DNA Mitocondrial/genética , Espécies em Perigo de Extinção , Evolução Molecular , Haplótipos , Ilhas , Filogeografia , Análise de Sequência de DNA
15.
J Stud Alcohol Drugs ; 2024 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-38497402

RESUMO

OBJECTIVE: University students who experience more discrimination typically report more negative consequences from alcohol use. The study aimed to assess whether drinking to cope and protective behavioral strategies for alcohol use would help explain the relationship between everyday discrimination and alcohol-related consequences among university student drinkers. METHOD: Data were collected in Fall 2020 and the sample included 707 undergraduate and graduate students from a large public institution in the northeast who reported consuming alcohol in the past month. Participants identified predominantly as women (71.7%; 24.6% men) and White (65.1%; 7.9% Black/African American; 7.2% Asian/Asian American; 7.1% Hispanic/Latinx). A cross-sectional serial mediation analysis using structural equation modeling was conducted using Mplus. RESULTS: Controlling for alcohol use, results supported a serial partial mediation model. More experiences of discrimination predicted a significant increase in alcohol-related consequences, above and beyond the increase attributed to drinking to cope. More frequent use of protective behavioral strategies significantly increased the odds of reporting no alcohol-related consequences. CONCLUSIONS: Drinking to cope and protective behavioral strategies for alcohol use may help explain why university students who report frequent discrimination are more likely to experience alcohol-related consequences, independent of how much alcohol they consume. Findings can inform clinical and prevention practice, advocacy, and training.

16.
Bioorg Med Chem ; 21(22): 7222-8, 2013 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-24120088

RESUMO

The nucleoside analog 5,6-dihydro-5-aza-2'-deoxycytidine (KP-1212) has been investigated as a first-in-class lethal mutagen of human immunodeficiency virus type-1 (HIV-1). Since a prodrug monotherapy did not reduce viral loads in Phase II clinical trials, we tested if ribonucleotide reductase inhibitors (RNRIs) combined with KP-1212 would improve antiviral activity. KP-1212 potentiated the activity of gemcitabine and resveratrol and simultaneously increased the viral mutant frequency. G-to-C mutations predominated with the KP-1212-resveratrol combination. These observations represent the first demonstration of a mild anti-HIV-1 mutagen potentiating the antiretroviral activity of RNRIs and encourage the clinical translation of enhanced viral mutagenesis in treating HIV-1 infection.


Assuntos
Fármacos Anti-HIV/química , Fármacos Anti-HIV/farmacologia , Desoxicitidina/análogos & derivados , Inibidores Enzimáticos/química , Inibidores Enzimáticos/farmacologia , HIV-1/efeitos dos fármacos , Ribonucleotídeo Redutases/antagonistas & inibidores , Proteínas Virais/antagonistas & inibidores , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Desoxicitidina/química , Desoxicitidina/farmacologia , Genes Reporter/genética , Proteínas de Fluorescência Verde/genética , Proteínas de Fluorescência Verde/metabolismo , HIV-1/enzimologia , HIV-1/genética , Humanos , Proteínas Luminescentes/genética , Proteínas Luminescentes/metabolismo , Mutação , Resveratrol , Ribonucleotídeo Redutases/metabolismo , Estilbenos/química , Estilbenos/farmacologia , Proteínas Virais/metabolismo , Proteína Vermelha Fluorescente
17.
J Am Coll Health ; : 1-5, 2023 May 09.
Artigo em Inglês | MEDLINE | ID: mdl-37159923

RESUMO

Objective: Drinking more and drinking to cope increase undergraduates' likelihood of experiencing alcohol-related problems (ARP; e.g., driving intoxicated). In accordance with stress-coping models of addiction, anxiety about COVID-19 may motivate undergraduates to drink to cope, leading them to experience more ARP. However, this hypothesis has not been tested. Participants and methods: During fall 2020, 358 undergraduate drinkers (Mage = 21.18; 69.80% cis-women; 62.30% White) provided data regarding COVID-anxiety, alcohol consumption, drinking to cope, and ARP during an annual student survey. Results: Mediation analysis controlling for alcohol consumption revealed greater COVID-anxiety predicted higher levels of drinking to cope; in turn, higher levels of drinking to cope were associated with more ARP. Additionally, the positive relationship between greater COVID-anxiety and experiencing more ARP was explained entirely by higher levels of drinking to cope. Conclusion: During the pandemic and beyond, university prevention and intervention initiatives should target coping motives for alcohol use to help students avoid ARP.

18.
J Am Coll Health ; 71(4): 1250-1258, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-34242533

RESUMO

Objective: Athletic involvement is linked to increased risk for heavy alcohol use among college students. We examined whether student-athletes from diverse racial/ethnic backgrounds differ with respect to heavy drinking and related consequences. Method: Participants were 15,135 student-athlete drinkers (50.7% female) from 170 NCAA member institutions who participated in an online study. Results: Findings from our hierarchical linear models indicated that being a male student-athlete was associated with an increased likelihood of high intensity drinking (10/8 + drinks/per sitting for males/females) for White, Asian American/Pacific Islander, and Black student-athletes, but not for Hispanic student-athletes. Additionally, being a female student-athlete was associated with higher levels of negative alcohol-related consequences across all racial/ethnic groups. Finally, at similar drink quantities, compared to being a White student-athlete, being an Asian American/Pacific Islander student-athlete was associated with higher levels of alcohol-related consequences. Conclusions: Student-athlete drinkers are not homogeneous with respect to heavy drinking and related consequences.


Assuntos
Consumo de Bebidas Alcoólicas , Estudantes , Humanos , Masculino , Feminino , Consumo de Bebidas Alcoólicas/epidemiologia , Caracteres Sexuais , Universidades , Atletas , Etanol
19.
Psychol Addict Behav ; 36(6): 741-747, 2022 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-35797167

RESUMO

OBJECTIVE: Despite findings indicating that college students' alcohol use remains a significant problem across institutions of higher education, the support for a strong link between excessive drinking and risk for suicide and other psychiatric comorbidities, and associations between excessive drinking and stopping out or dropping out of college, there continue to be barriers to the routine, consistent, and timely implementation of efficacious brief alcohol interventions by mental health practitioners working in college- and university-based clinical service settings. This commentary will focus on the identification of infrastructure, attitudinal, and training-related barriers to the uptake of evidence-based strategies within higher education clinical intervention settings and opportunities to address them. Barriers discussed include compromises to intervention fidelity, limited staffing and multiple and competing service demands, stigma and a lack of understanding concerning the link between alcohol use and psychiatric symptomology, and scarcity of training, professional development, and funding opportunities specifically aimed at the promotion of evidence-based practices addressing risky and excessive drinking among college students. CONCLUSIONS: Alcohol researchers can play a key role in promoting effective, consistent, and timely implementation of efficacious brief interventions in campus-based clinical service settings through strategic engagement with college and university mental health professionals and senior-level decision-makers using a system-focused lens. Both institutional and national-level collaboration and advocacy for translational research opportunities are critical to encourage dissemination, implementation, and sustainability of efficacious brief intervention practices. (PsycInfo Database Record (c) 2022 APA, all rights reserved).


Assuntos
Intervenção em Crise , Estudantes , Consumo de Bebidas Alcoólicas/prevenção & controle , Consumo de Bebidas Alcoólicas/psicologia , Pessoal de Saúde , Humanos , Estudantes/psicologia , Universidades , Adulto Jovem
20.
J Prev Health Promot ; 3(1): 68-96, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-35450297

RESUMO

Sexism and objectification present major challenges for mental and physical health among women. Scholars have called for research to identify mechanisms that underlie these associations as well as to delineate factors to target in prevention and intervention efforts. This study aimed to build on central tenets of objectification theory through its examination of sexist experiences in relation to body surveillance, body shame, depressive symptoms, and the health risk behaviors of substance use (i.e., alcohol and drug misuse) and sexual risk (i.e., condom use and number of sexual partners) among a large sample of college student women. We also examined whether body surveillance, body shame, and depressive symptoms would mediate theorized pathways extended to substance use and sexual risk. A sample of 505 full-time college student women ages 18-26 completed an online survey that assessed their health and behaviors. We used structural equation modeling to test mediation hypotheses. Results largely supported hypotheses, extended objectification theory to sexual risk, and expanded upon past research on objectification in relation to substance use. Notably, results of this study provided a more nuanced knowledge of how objectification may lead to increases in sexual risk when assessed by number of sexual partners (but not condom use). Further research is warranted to understand potential explanatory pathways between sexism, objectification, and sexual risk. Findings can inform prevention and intervention efforts to target body surveillance, body shame, and depressive symptoms to attempt to reduce the burden of sexist experiences on women's health.

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