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1.
Environ Res ; 252(Pt 1): 118797, 2024 Mar 28.
Artigo em Inglês | MEDLINE | ID: mdl-38555084

RESUMO

BACKGROUND: Prenatal air pollution exposure has been associated with individual inflammatory, cardiovascular, and metabolic biomarkers in mothers and neonates. However, studies of air pollution and a comprehensive panel of biomarkers across maternal and cord blood samples remain limited. Few studies used data-driven methods to identify biomarker groupings that converge biomarkers from multiple biological pathways. This study aims to investigate the impacts of prenatal air pollution on groups of biomarkers in maternal and cord blood samples. METHODS: In the Maternal And Developmental Risks from Environmental and Social Stressors (MADRES) cohort, 87 biomarkers were quantified from 45 trimester 1 maternal blood and 55 cord blood samples. Pregnancy and trimester 1-averaged concentrations of particulate matter ≤2.5 µm and ≤10 µm in diameter (PM2.5 and PM10), nitrogen dioxide (NO2), and ozone (O3) were estimated, using inverse distance squared weighted spatial interpolation from regulatory air monitoring stations. Traffic-related NOx was assessed using California Line Source Dispersion Model: freeway/highway roads, non-freeway major roads, non-freeway minor roads, and their sum as total NOx. Elastic Net (EN) regression within the rexposome R package was used to group biomarkers and assess their associations with air pollution. RESULTS: In maternal samples, trimester 1-averaged PM10 was associated with elevated inflammation biomarkers and lowered cardiovascular biomarkers. NO2 exhibited positive associations with cardiovascular and inflammation markers. O3 was inversely associated with inflammation, metabolic, and cardiovascular biomarkers. In cord blood, pregnancy-averaged PM2.5 was associated with higher cardiovascular biomarkers and lower metabolic biomarkers. PM10 was associated with lower inflammation and higher cardiovascular biomarkers. Total and major road NOx was associated with lower cardiovascular biomarkers. CONCLUSION: Prenatal air pollution exposure was associated with changes in biomarkers related to inflammation, cardiovascular, metabolic, cancer, and neurological function in both mothers and neonates. This study shed light on mechanisms by which air pollution can influence biological function during pregnancy.

2.
Transl Psychiatry ; 14(1): 89, 2024 Feb 12.
Artigo em Inglês | MEDLINE | ID: mdl-38342906

RESUMO

In this study, the effect of cumulative ACEs experienced on human maternal DNA methylation (DNAm) was estimated while accounting for interaction with domains of ACEs in prenatal peripheral blood mononuclear cell samples from the Maternal and Developmental Risks from Environmental Stressors (MADRES) pregnancy cohort. The intergenerational transmission of ACE-associated DNAm was also explored used paired maternal (N = 120) and neonatal cord blood (N = 69) samples. Replication in buccal samples was explored in the Children's Health Study (CHS) among adult parental (N = 31) and pediatric (N = 114) samples. We used a four-level categorical indicator variable for ACEs exposure: none (0 ACEs), low (1-3 ACEs), moderate (4-6 ACEs), and high (>6 ACEs). Effects of ACEs on maternal DNAm (N = 240) were estimated using linear models. To evaluate evidence for intergenerational transmission, mediation analysis (N = 60 mother-child pairs) was used. Analysis of maternal samples displayed some shared but mostly distinct effects of ACEs on DNAm across low, moderate, and high ACEs categories. CLCN7 and PTPRN2 was associated with maternal DNAm in the low ACE group and this association replicated in the CHS. CLCN7 was also nominally significant in the gene expression correlation analysis among maternal profiles (N = 35), along with 11 other genes. ACE-associated methylation was observed in maternal and neonatal profiles in the COMT promoter region, with some evidence of mediation by maternal COMT methylation. Specific genomic loci exhibited mutually exclusive maternal ACE effects on DNAm in either maternal or neonatal population. There is some evidence for an intergenerational effect of ACEs, supported by shared DNAm signatures in the COMT gene across maternal-neonatal paired samples.


Assuntos
Experiências Adversas da Infância , Feminino , Adulto , Recém-Nascido , Gravidez , Humanos , Criança , Metilação de DNA , Mucosa Bucal , Leucócitos Mononucleares , Mães , Pais , Canais de Cloreto
3.
Environ Pollut ; 342: 123131, 2024 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-38092343

RESUMO

Organophosphate esters (OPEs) are increasingly considered neurotoxicants which may impact gross and fine motor development. We evaluated associations between prenatal OPE exposures and infant motor development. Third trimester urinary concentrations of nine OPE metabolites were measured in 329 mother-infant dyads participating in the Maternal And Developmental Risks from Environmental and Social Stressors (MADRES) cohort. Child gross and fine motor development at 6, 9, 12, and 18-months were assessed with the Ages and Stages Questionnaire-3 (ASQ-3) and operationalized in models using dichotomous instrument-specific cutoffs for typical motor development. Five OPE metabolites with >60% detection were specific-gravity-adjusted, natural log-transformed, and modeled continuously, while four metabolites with <60% detection were modeled dichotomously (detected/not-detected). We fit mixed effects logistic regression between OPE metabolites and fine/gross motor development and assessed sex-specific effects using a statistical interaction term and sex-stratified models. Among children, 31% and 23% had gross and fine motor scores, respectively, below the ASQ-3 at-risk cutoffs at least once across infancy. A doubling in prenatal diphenyl phosphate (DPHP) exposure was associated with 26% increased odds of potential fine motor delays (ORfine = 1.26, 95% CI: 1.02, 1.57, p = 0.04). We also observed significant interactions by infant sex for associations of detected dipropyl phosphate (DPRP) with gross motor development (pinteraction = 0.048) and detected bis(1-chloro-2-propyl) phosphate (BCIPP) with fine motor development (pinteraction = 0.02). Females had greater odds of potential motor delays for both detected DPRP (females vs males ORgross (95% CI) = 1.48 (0.71, 3.09), p = 0.30 vs 0.27 (0.06, 1.29), p = 0.10) and detected BCIPP (females vs males ORfine (95% CI) = 2.72 (1.27, 5.85), p = 0.01 vs 0.76 (0.31, 1.90), p = 0.56). There were no other significant associations between other metabolites and motor development, despite similar patterns. We found evidence of adverse effects of prenatal OPE exposures on infant motor development with greater adverse effects among female infants with some OPE metabolites.


Assuntos
Retardadores de Chama , Efeitos Tardios da Exposição Pré-Natal , Masculino , Criança , Lactente , Gravidez , Humanos , Feminino , Ésteres/urina , Organofosfatos/metabolismo , Fosfatos , Retardadores de Chama/metabolismo
4.
Environ Health ; 22(1): 66, 2023 09 22.
Artigo em Inglês | MEDLINE | ID: mdl-37737180

RESUMO

BACKGROUND: Evidence suggests organophosphate esters (OPEs) are neurotoxic; however, the epidemiological literature remains scarce. We investigated whether prenatal exposures to OPEs were associated with child neurobehavior in the MADRES cohort. METHODS: We measured nine OPE metabolites in 204 maternal urine samples (gestational age at collection: 31.4 ± 1.8 weeks). Neurobehavior problems were assessed among 36-month-old children using the Child Behavior Checklist's (CBCL) three composite scales [internalizing, externalizing, and total problems]. We examined associations between tertiles of prenatal OPE metabolites (> 50% detection) and detect/non-detect categories (< 50% detection) and CBCL composite scales using linear regression and generalized additive models. We also examined mixtures for widely detected OPEs (n = 5) using Bayesian kernel machine regression. RESULTS: Maternal participants with detectable versus non-detectable levels of bis(2-methylphenyl) phosphate (BMPP) had children with 42% (95% CI: 4%, 96%) higher externalizing, 45% (-2%, 114%) higher internalizing, and 35% (3%, 78%) higher total problems. Participants in the second versus first tertile of bis(butoxethyl) phosphate (BBOEP) had children with 43% (-1%, 109%) higher externalizing scores. Bis(1-chloro-2-propyl) phosphate (BCIPP) and child sex had a statistically significant interaction in internalizing (p = 0.02) and total problems (p = 0.03) models, with 120% (23%, 295%) and 57% (6%, 134%) higher scores in the third versus first BCIPP tertile among males. Among females, detectable vs non-detectable levels of prenatal BMPP were associated with 69% higher externalizing scores (5%, 170%) while the third versus first tertile of prenatal BBOEP was associated with 45% lower total problems (-68%, -6%). Although the metabolite mixture and each CBCL outcome had null associations, we observed marginal associations between di-n-butyl phosphate and di-isobutyl phosphate (DNBP + DIBP) and higher internalizing scores (0.15; 95% CrI: -0.02, 0.32), holding other metabolites at their median. CONCLUSIONS: Our results generally suggest adverse and sex-specific effects of prenatal exposure to previously understudied OPEs on neurobehavioral outcomes in 36-month children, providing evidence of potential OPE neurotoxicity.


Assuntos
Síndromes Neurotóxicas , Efeitos Tardios da Exposição Pré-Natal , Feminino , Masculino , Gravidez , Criança , Humanos , Lactente , Pré-Escolar , Teorema de Bayes , Efeitos Tardios da Exposição Pré-Natal/induzido quimicamente , Efeitos Tardios da Exposição Pré-Natal/epidemiologia , Fosfatos , Organofosfatos , Ésteres
5.
Res Sq ; 2023 Jun 26.
Artigo em Inglês | MEDLINE | ID: mdl-37461498

RESUMO

Adverse Childhood Experiences (ACEs) are events that occur before a child turns 18 years old that may cause trauma. In this study, the effect of cumulative ACEs experienced on human maternal DNA methylation (DNAm) was estimated while accounting for interaction with domains of ACEs in prenatal peripheral blood mononuclear cell samples from the Maternal and Developmental Risks from Environmental Stressors (MADRES) pregnancy cohort. The intergenerational transmission of ACE-associated DNAm was also explored used paired maternal and neonatal cord blood samples. Replication in buccal samples was explored in the Children's Health Study (CHS). We used a four-level categorical indicator variable for ACEs exposure: none (0 ACEs), low (1-3 ACEs), moderate (4-6 ACEs), and high (> 6 ACEs). Effects of ACEs on maternal DNAm (N = 240) were estimated using linear models. To evaluate evidence for intergenerational transmission, mediation analysis was used. Analysis of maternal samples displayed some shared but mostly distinct effects of ACEs on DNAm across low, moderate, and high ACEs categories. CLCN7 and PTPRN2 was associated with maternal DNAm in the low ACE group and this association replicated in the CHS. ACE-associated methylation was observed in maternal and neonatal profiles in the COMT promoter region, with some evidence of mediation by maternal COMT methylation. Specific genomic loci exhibited mutually exclusive maternal ACE effects on DNAm in either maternal or neonatal population. There is some evidence for an intergenerational effect of ACEs, supported by shared DNAm signatures in the COMT gene across maternal-neonatal paired samples.

6.
Environ Res ; 226: 115703, 2023 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-36934865

RESUMO

BACKGROUND: Organophosphate esters (OPEs) are used as flame retardants and plasticizers in various consumer products. Limited prior research suggests sex-specific effects of prenatal OPE exposures on fetal development. We evaluated overall and sex-specific associations between prenatal OPE exposures and gestational age (GA) at birth and birthweight for gestational age (BW for GA) z-scores among the predominately low-income, Hispanic MADRES cohort. METHODS: Nine OPE metabolite concentrations were measured in 421 maternal urine samples collected during a third trimester visit (GA = 31.5 ± 2.0 weeks). We examined associations between single urinary OPE metabolites and GA at birth and BW for GA z-scores using linear regression models and Generalized Additive Models (GAMs) and effects from OPE mixtures using Bayesian Kernel Machine Regression (BKMR). We also assessed sex-specific differences in single metabolite analyses by evaluating statistical interactions and stratifying by sex. RESULTS: We did not find significant associations between individual OPE metabolites and birth outcomes in the full infant sample; however, we found that higher bis(1,3-dichloro-2-propyl) phosphate (BDCIPP) was associated with earlier GA at birth among male infants (p = 0.04), and a nonlinear, inverted U-shape association between the sum of dibutyl phosphate and di-isobutyl phosphate (DNBP + DIBP) and GA at birth among female infants (p = 0.03). In mixtures analysis, higher OPE metabolite mixture exposures was associated with lower GA at birth, which was primarily driven by female infants. No associations were observed between OPE mixtures and BW for GA z-scores. CONCLUSION: Higher BDCIPP and DNBP + DIBP concentrations were associated with earlier GA at birth among male and female infants, respectively. Higher exposure to OPE mixtures was associated with earlier GA at birth, particularly among female infants. However, we saw no associations between prenatal OPEs and BW for GA. Our results suggest sex-specific impacts of prenatal OPE exposures on GA at birth.


Assuntos
Retardadores de Chama , Organofosfatos , Gravidez , Recém-Nascido , Humanos , Masculino , Lactente , Feminino , Teorema de Bayes , Organofosfatos/toxicidade , Organofosfatos/urina , Fosfatos , Retardadores de Chama/toxicidade , Ésteres
7.
J Affect Disord ; 323: 799-808, 2023 02 15.
Artigo em Inglês | MEDLINE | ID: mdl-36563790

RESUMO

BACKGROUND: MicroRNA (miRNA) circulating in plasma has been proposed as biomarkers for a variety of diseases and stress measures, including depression, stress, and trauma. However, few studies have examined the relationship between stress and miRNA during pregnancy. METHODS: In this study, we examined associations between measures of stress and depression during pregnancy with miRNA in early and late pregnancy from the MADRES cohort of primarily low-income Hispanic women based in Los Angeles, California. Extracellular-vesicle- (EV-) associated miRNA were isolated from maternal plasma and quantified using the Nanostring nCounter platform. Correlations for stress-associated miRNA were also calculated for 89 matching cord blood samples. RESULTS: Fifty miRNA were nominally associated with depression, perceived stress, and prenatal distress (raw p < 0.05) with 17 miRNA shared between two or more stress measures. Two miRNA (miR-150-5p and miR-148b-3p) remained marginally significant after FDR adjustment (p < 0.10). Fifteen PANTHER pathways were enriched for predicted gene targets of the 50 miRNA associated with stress. Clusters of maternal and neonate miRNA expression suggest a link between maternal and child profiles. LIMITATIONS: The study evaluated 142 miRNA and was not an exhaustive analysis of all discovered miRNA. Evaluations for stress, depression and trauma were based on self-reported instruments, rather than diagnostic tools. CONCLUSIONS: Depression and stress during pregnancy are associated with some circulating EV miRNA. Given that EV miRNA play important roles in maternal-fetal communication, this may have downstream consequences for maternal and child health, and underscore the importance of addressing mental health during pregnancy, especially in health disparities populations.


Assuntos
MicroRNA Circulante , MicroRNAs , Criança , Feminino , Humanos , Recém-Nascido , Gravidez , Depressão/genética , Família , Estresse Psicológico/genética , Vesículas Extracelulares
8.
Epigenetics ; 17(10): 1128-1142, 2022 10.
Artigo em Inglês | MEDLINE | ID: mdl-34696694

RESUMO

Exposure to metals increases risk for pregnancy complications. Extracellular vesicle (EV) miRNA contribute to maternal-foetal communication and are dysregulated in pregnancy complications. However, metal impacts on maternal circulating EV miRNA during pregnancy are unknown. Our objective was to investigate the impact of multiple metal exposures on EV miRNA in maternal circulation during pregnancy in the MADRES Study. Associations between urinary concentrations of nine metals and 106 EV miRNA in maternal plasma during pregnancy were investigated using robust linear regression (N = 231). Primary analyses focused on metal-miRNA associations in early pregnancy (median: 12.3 weeks gestation). In secondary analyses, we investigated associations with late pregnancy miRNA counts (median: 31.8 weeks gestation) in a subset of participants (N = 184) with paired measures. MiRNA associated with three or more metals (PFDR<0.05) were further investigated using Bayesian Kernel Machine Regression (BKMR), an environmental mixture method. Thirty-five miRNA were associated (PFDR<0.05) with at least one metal in early pregnancy. One association (an inverse association between cobalt and miR-150-5p) remained statistically significant when evaluating late pregnancy miRNA counts. Eight miRNA (miR-302b-3p, miR-199a-5p, miR-188-5p, miR-138-5p, miR-212-3p, miR-608, miR-1272, miR-19b-3p) were associated with three metals (barium, mercury, and thallium) in early pregnancy, and their predicted target genes were enriched in pathways important for placental development. Results were consistent when using BKMR. Early pregnancy exposure to barium, mercury, and thallium may have short-term impacts on a common set of EV miRNA which target pathways important for placental development.


Assuntos
MicroRNA Circulante , Vesículas Extracelulares , Mercúrio , MicroRNAs , Complicações na Gravidez , Bário/metabolismo , Teorema de Bayes , MicroRNA Circulante/metabolismo , Cobalto/metabolismo , Metilação de DNA , Vesículas Extracelulares/genética , Vesículas Extracelulares/metabolismo , Feminino , Humanos , Mercúrio/metabolismo , Metais , MicroRNAs/metabolismo , Placenta/metabolismo , Gravidez , Complicações na Gravidez/genética , Tálio/metabolismo
9.
Epigenetics ; 17(3): 269-285, 2022 03.
Artigo em Inglês | MEDLINE | ID: mdl-33734019

RESUMO

Circulating miRNA may contribute to the development of adverse birth outcomes. However, few studies have investigated extracellular vesicle (EV) miRNA, which play important roles in intercellular communication, or compared miRNA at multiple time points in pregnancy. In the current study, 800 miRNA were profiled for EVs from maternal plasma collected in early (median: 12.5 weeks) and late (median: 31.8 weeks) pregnancy from 156 participants in the MADRES Study, a health disparity pregnancy cohort. Associations between miRNA and birth weight, birth weight for gestational age (GA), and GA at birth were examined using covariate-adjusted robust linear regression. Differences by infant sex and maternal BMI were also investigated. Late pregnancy measures of 13 miRNA were associated with GA at birth (PFDR<0.050). Negative associations were observed for eight miRNA (miR-4454+ miR-7975, miR-4516, let-7b-5p, miR-126-3p, miR-29b-3p, miR-15a-5p, miR-15b-5p, miR-19b-3p) and positive associations for five miRNA (miR-212-3p, miR-584-5p, miR-608, miR-210-3p, miR-188-5p). Predicted target genes were enriched (PFDR<0.050) in pathways involved in organogenesis and placental development. An additional miRNA (miR-107), measured in late pregnancy, was positively associated with GA at birth in infants born to obese women (PFDR for BMI interaction = 0.011). In primary analyses, the associations between early pregnancy miRNA and birth outcomes were not statistically significant (PFDR≥0.05). However, sex-specific associations were observed for early pregnancy measures of 37 miRNA and GA at birth (PFDR for interactions<0.050). None of the miRNA were associated with fetal growth measures (PFDR≥0.050). Our findings suggest that EV miRNA in both early and late pregnancy may influence gestational duration.


Assuntos
Vesículas Extracelulares , MicroRNAs , Complicações na Gravidez , Gravidez , Metilação de DNA , Vesículas Extracelulares/genética , Vesículas Extracelulares/metabolismo , Feminino , Humanos , Recém-Nascido , Masculino , MicroRNAs/sangue , MicroRNAs/metabolismo , Placenta/metabolismo , Placentação , Gravidez/genética , Gravidez/metabolismo , Complicações na Gravidez/genética , Complicações na Gravidez/metabolismo
10.
PLoS One ; 16(5): e0251259, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33979365

RESUMO

MicroRNA (miRNA) circulating in plasma have been proposed as biomarkers for a variety of conditions and diseases, including complications during pregnancy. During pregnancy, about 15-25% of maternal plasma exosomes, a small size-class of EVs, are hypothesized to originate in the placenta, and may play a role in communication between the fetus and mother. However, few studies have addressed changes in miRNA over the course of pregnancy with repeated measures, nor focused on diverse populations. We describe changes in miRNA in early and late pregnancy from the MADRES cohort of primarily low-income Hispanic women based in Los Angeles, CA. miRNA derived from extracellular-vesicles (EVs) were isolated from maternal blood plasma samples collected in early and late pregnancy. In this study, we identified 64 of 130 detectable miRNA which significantly increased with gestational age at the time of collection (GA), and 26 which decreased with GA. Possible fetal sex-specific associations were observed for 30 of these 90 significant miRNA. Predicted gene targets for miRNA significantly associated with GA were identified using MirDIP and were found to be enriched for Gene Ontology categories that included energetic and metabolic processes but were underrepresented in immune-related categories. Circulating EV-associated miRNA during pregnancy are likely important for maternal-fetal communication, and may play roles in supporting and maintaining a healthy pregnancy, given the changing needs of the fetus.


Assuntos
Vesículas Extracelulares/genética , MicroRNAs/genética , Gravidez/genética , Adulto , Biomarcadores/metabolismo , Estudos de Coortes , Exossomos/metabolismo , Vesículas Extracelulares/metabolismo , Feminino , Expressão Gênica/genética , Idade Gestacional , Humanos , Los Angeles , MicroRNAs/sangue , Pessoa de Meia-Idade , Placenta/metabolismo , Transcriptoma/genética
11.
J Hosp Palliat Nurs ; 21(6): E1-E8, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31033646

RESUMO

It is estimated that 11.1 million people in the United States are living with serious illness, and most people with serious illness need palliative care. Quality palliative care incorporates culturally sensitive care, and with the increasing diversity in the United States, it has become even more critical that nurses and health care professionals be prepared to meet the unique needs of those living within the diverse and underserved populations of this country. Advocating for access to palliative care for the seriously ill, culturally respectful care at the end of life, and honoring values, practices, and beliefs are essential roles of the nurse. This article presents 4 examples of individuals from diverse and potentially vulnerable US populations who face unique challenges as they deal with their life-limiting diseases and face end of life.


Assuntos
Competência Cultural/psicologia , Enfermagem de Cuidados Paliativos na Terminalidade da Vida/normas , Populações Vulneráveis/estatística & dados numéricos , Adulto , Idoso , Feminino , Saúde Global , Enfermagem de Cuidados Paliativos na Terminalidade da Vida/tendências , Humanos , Masculino , Pessoa de Meia-Idade , Estados Unidos
12.
Exp Gerontol ; 119: 146-156, 2019 05.
Artigo em Inglês | MEDLINE | ID: mdl-30738921

RESUMO

Because stress tolerance and longevity are mechanistically and phenotypically linked, the sex with higher acute stress tolerance might be expected to also live longer. On the other hand, the association between stress tolerance and lifespan may be complicated by tradeoffs between acute tolerance and long-term survival. Here we use the copepod Tigriopus californicus to test for sex differences in stress resistance, proteolytic activity and longevity. Unlike many model organisms, this species does not have sex chromosomes. However, substantial sex differences were still observed. Females were found to have superior tolerance to a range of acute stressors (high temperature, high salinity, low salinity, copper and bisphenol A (BPA)) across a variety of treatments including different populations, pure vs. hybrid crosses, and different shading environments. Upregulation of proteolytic capacity - one molecular mechanism for responding to acute stress - was also found to be sexually dimorphic. In the combined stress treatment of chronic copper exposure followed by acute heat exposure, proteolytic capacity was suppressed for males. Females, however, maintained a robust proteolytic stress response. While females consistently showed greater tolerance to short-term stress, lifespan was largely equivalent between the two sexes under both benign conditions and mild thermal stress. Our findings indicate that short-term stress tolerance does not predict long-term survival under relatively mild conditions.


Assuntos
Copépodes/fisiologia , Animais , Compostos Benzidrílicos/toxicidade , Copépodes/efeitos dos fármacos , Copépodes/genética , Cobre/toxicidade , Feminino , Hibridização Genética , Longevidade/fisiologia , Masculino , Fenóis/toxicidade , Proteólise , Tolerância ao Sal , Caracteres Sexuais , Razão de Masculinidade , Estresse Fisiológico , Termotolerância
13.
Environ Sci Pollut Res Int ; 25(4): 3183-3192, 2018 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29019110

RESUMO

Organismal chemical tolerance is often used to assess ecological risk and monitor water quality, yet tolerance can differ between field- and lab-raised organisms. In this study, we examined how tolerance to copper (Cu) and tributyltin oxide (TBTO) in two species of marine copepods, Tigriopus japonicus and T. californicus, changed across generations under benign laboratory culture (in the absence of pre-exposure to chemicals). Both copepod species exhibited similar chemical-specific changes in tolerance, with laboratory maintenance resulting in increased Cu tolerance and decreased TBTO tolerance. To assess potential factors underlying these patterns, chemical tolerance was measured in conjunction with candidate environmental variables (temperature, UV radiation, diet type, and starvation). The largest chemical-specific effect was found for starvation, which decreased TBTO tolerance but had no effect on Cu tolerance. Understanding how chemical-specific tolerance can change in the laboratory will be critical in strengthening bioassays and their applications for environmental protection and chemical management.


Assuntos
Copépodes/efeitos dos fármacos , Tolerância a Medicamentos , Exposição Ambiental , Poluentes Químicos da Água/toxicidade , Animais , Bioensaio , Cobre/farmacologia , Cobre/toxicidade , Compostos de Trialquitina/toxicidade , Qualidade da Água/normas
14.
Environ Sci Pollut Res Int ; 22(20): 16143-52, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-26070741

RESUMO

Geographical variation in chemical tolerance within a species can significantly influence results of whole animal bioassays, yet a literature survey showed that the majority of articles using bioassays did not provide detail on the original field collection site of their test specimens confounding the ability for accurate replication and comparison of results. Biological variation as a result of population-specific tolerance, if not addressed, can be misinterpreted as experimental error. Our studies of two marine copepod species, Tigriopus japonicus and Tigriopus californicus, found significant intra- and inter-specific variation in tolerance to copper and tributyltin. Because both species tolerate copper concentrations orders of magnitude higher than those found in coastal waters, difference in copper tolerance may be a by-product of adaptation to other stressors such as high temperature. Controlling for inter-population tolerance variation will greatly strengthen the application of bioassays in chemical toxicity tests.


Assuntos
Copépodes/efeitos dos fármacos , Cobre/toxicidade , Tolerância a Medicamentos , Compostos de Trialquitina/toxicidade , Poluentes Químicos da Água/toxicidade , Aclimatação , Animais , Bioensaio , California , Substâncias Perigosas/toxicidade , Hong Kong , Temperatura Alta , Testes de Toxicidade/métodos , Testes de Toxicidade Aguda
15.
Chemosphere ; 112: 465-71, 2014 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25048941

RESUMO

Establishing water quality criteria using bioassays is complicated by variation in chemical tolerance between populations. Two major contributors to this variation are acclimation and adaptation, which are both linked to exposure history, but differ in how long their effects are maintained. Our study examines how tolerance changes over multiple generations of exposure to two common marine pollutants, copper (Cu) and tributyltin oxide (TBTO), in a sexually reproducing marine copepod, Tigriopus californicus. Lines of T. californicus were chronically exposed to sub-lethal levels of Cu and TBTO for 12 generations followed by a recovery period of 3 generations in seawater control conditions. At each generation, the average number of offspring produced and survived to 28 d was determined and used as the metric of tolerance. Lines exposed to Cu and TBTO showed an overall increase in tolerance over time. Increased Cu tolerance arose by generation 3 in the chronically exposed lines and was lost after 3 generations in seawater control conditions. Increased TBTO tolerance was detected at generation 7 and was maintained even after 3 generations in seawater control conditions. It was concluded from this study that tolerance to Cu is consistent with acclimation, a quick gain and loss of tolerance. In contrast, TBTO tolerance is consistent with adaptation, in which onset of tolerance was delayed relative to an acclimation response and maintained in the absence of exposure. These findings illustrate that consideration of exposure history is necessary when using bioassays to measure chemical tolerance.


Assuntos
Aclimatação/efeitos dos fármacos , Bioensaio , Copépodes/efeitos dos fármacos , Copépodes/fisiologia , Cobre/toxicidade , Água do Mar/química , Compostos de Trialquitina/toxicidade , Poluentes Químicos da Água/toxicidade , Animais , Interpretação Estatística de Dados , Fatores de Tempo , Qualidade da Água
16.
J Am Geriatr Soc ; 57 Suppl 2: S293-5, 2009 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-20122032

RESUMO

OBJECTIVES: To determine whether age or stage of cancer can be used to identify caregivers at high risk for excessive burden or distress. DESIGN: Descriptive data collected as part of a psychosocial research registry, comparing younger caregivers with older and caregivers of early-stage patients with those of later stage. PARTICIPANTS: Caregivers of newly diagnosed adult cancer patients. MEASUREMENTS: Caregiver Reaction Assessment (CRA), the Profile of Mood States (POMS), single-item indicators from the Patient Reported Outcome Measurement Information System set, and the Medical Outcomes Study Social Support (MOS-SS) Scale. Patient information was obtained from the medical record. RESULTS: Younger caregivers and caregivers of patients with Stage I and II cancer identified a greater lack of family support than older caregivers and caregivers of patients with Stage III and IV cancer. Significant regression models were found for three CRA subscales (Disrupted Schedule, Lack of Family Support, and Health Problems), as well as for the POMS depression and fatigue scales. Caregiver social support (MOS-SS) made the only significant contribution to the models. There were significant differences between caregivers with high and low levels of social support on almost all measures of well-being. CONCLUSION: Incorporating formal assessment of social support may be useful in identifying at-risk caregivers. In addition, there is a need to further investigate which dimensions of social support are most strongly related to measures of well-being.


Assuntos
Cuidadores/psicologia , Efeitos Psicossociais da Doença , Neoplasias/psicologia , Estresse Psicológico/epidemiologia , Adulto , Fatores Etários , Idoso , Estudos de Coortes , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Determinação de Necessidades de Cuidados de Saúde , Estadiamento de Neoplasias , Neoplasias/patologia , Neoplasias/terapia , Fatores de Risco , Apoio Social
17.
Psychooncology ; 16(4): 358-64, 2007 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-16986173

RESUMO

Research focused on the psychosocial aspects of the experience of persons with cancer and their family caregivers is hampered by the methodological challenges inherent in quality of life research. A data registry offers a potential solution to many of these problems in providing a large, comprehensive database, using standardized instruments. We report here our preliminary experience with establishing a Psychosocial Registry designed to advance research in the psychological, social, and spiritual aspects of quality of life of newly diagnosed cancer patients and their family caregivers. The first six months of enrollment demonstrated that the majority of newly diagnosed patients approached for consent (68%) and their primary family caregiver (92%) were willing to participate in the registry; of these, 80% also agreed to be contacted in the future for additional studies. Face-to-face interview was the preferred method of data collection. Our preliminary experience suggests that continuation of the registry with the current modest level of resources would generate a sample of approximately 1000 patients in three years. The long-range goal is to establish a national psychosocial data registry that will enroll patients at diagnosis and follow them through the entire cancer experience, including end of life or survivorship.


Assuntos
Neoplasias/psicologia , Qualidade de Vida/psicologia , Sistema de Registros , Projetos de Pesquisa , Facilitação Social , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Psicologia , Inquéritos e Questionários
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