Abstract:
:Previous studies in our laboratory demonstrated that high-performance liquid chromatography (HPLC) analysis of ground corncob bedding extracts characterized two components (peak I and peak II) that disrupted endocrine function in male and female rats and stimulated breast and prostate cancer cell proliferation in vitro and in vivo. The active substances in peak I were identified as an isomeric mixture of 9,12-oxy-10,13-dihydroxyoctadecanoic acid and 10,13-oxy-9,12-dihydroxyoctadecanoic acid, collectively designated tetrahydrofurandiols (THF-diols). Studies presented here describe the purification and identification of the HPLC peak II component as 9,10-dihydroxy-12-octadecenoic acid (leukotoxin diol; LTX-diol), a well-known leukotoxin. A synthetic mixture of LTX-diol and 12,13-dihydroxy-9-octadecenoic acid (iso-leukotoxin diol; i-LTX-diol) isomers was separated by HPLC, and each isomer stimulated (p < 0.001) MCF-7 cell proliferation in an equivalent fashion. The LTX-diol isomers failed to compete for [3H]estradiol binding to the estrogen receptor or nuclear type II sites, even though oral administration of very low doses of these compounds (> 0.8 mg/kg body weight/day) disrupted estrous cyclicity in female rats. The LTX-diols did not disrupt male sexual behavior, suggesting that sex differences exist in response to these endocrine-disruptive agents.
journal_name
Environ Health Perspectjournal_title
Environmental health perspectivesauthors
Markaverich BM,Crowley JR,Alejandro MA,Shoulars K,Casajuna N,Mani S,Reyna A,Sharp Jdoi
10.1289/ehp.8231subject
Has Abstractpub_date
2005-12-01 00:00:00pages
1698-704issue
12eissn
0091-6765issn
1552-9924journal_volume
113pub_type
杂志文章abstract:BACKGROUND:Recent policies attempting to reduce adverse effects of methylmercury exposure from fish consumption in the United States have targeted reductions in anthropogenic emissions from U.S. sources. OBJECTIVES:To analyze the prospects for future North American and international emissions controls, we assessed the...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.0900811
更新日期:2010-01-01 00:00:00
abstract::The objective of this study was to provide a basis for effectively protecting nonsmokers from acute sensory impacts and for preventing deterioration of indoor air quality caused by environmental tobacco smoke (ETS) emissions. With an olfactory experiment we determined odor detection thresholds (OT) of sidestream ETS (...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.011091045
更新日期:2001-10-01 00:00:00
abstract::Between 1966 and 1986, the childhood leukemia rate in Woburn, Massachusetts, was 4-fold higher than the national average. A multidisciplinary research team from MIT, which is being supported by the NIEHS Superfund Basic Research Program, has explored the possible importance of a temporal correlation between the period...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.95103s693
更新日期:1995-09-01 00:00:00
abstract:BACKGROUND:Increasing evidence suggests a proatherogenic role for lipoprotein-associated phospholipase A₂ (Lp-PLA2). A meta-analysis of published cohorts has shown that Lp-PLA2 is an independent predictor of coronary heart disease events and stroke. OBJECTIVE:In this study, we investigated whether the association betw...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1002681
更新日期:2011-07-01 00:00:00
abstract:BACKGROUND:Preterm birth (PTB), a leading cause of infant mortality and morbidity, has a complex etiology with a multitude of interacting causes and risk factors. The role of environmental contaminants, particularly bisphenol A (BPA), is understudied with regard to PTB. OBJECTIVES:In the present study we examined the ...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1408126
更新日期:2015-09-01 00:00:00
abstract::During a 2-year chronic inhalation study on methylene chloride (2000 or 0 ppm; 6 hr/day, 5 days/week), gas-uptake pharmacokinetic studies and tissue partition coefficient determinations were conducted on female B6C3F1, mice after 1 day, 1 month, 1 year, and 2 years of exposure. Using physiologically based pharmacokine...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.96104858
更新日期:1996-08-01 00:00:00
abstract::The role of lime in the formation of reactive oxygen species (ROS), i.e., O2-., H2O2, and OH., from betel-quid components (extracts of areca nut and catechu) was investigated in vitro using a chemiluminescence technique and an assay for oxidative DNA damage involving analysis of 8-hydroxy-2'-deoxyguanosine. Of the var...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.9298203
更新日期:1992-11-01 00:00:00
abstract::Isoflavonoids and related compounds such as coumestrol have classically been categorized as phytoestrogens because these environmentally derived substances bind to the estrogen receptor (ER) and increase uterine wet weight in immature rats and mice. Assessment of the binding affinities of isoflavonoids for ER and subs...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.95103574
更新日期:1995-06-01 00:00:00
abstract::Although press reports indicate that the leakage of methyl isocyanate (MIC) on December 3, 1984, in Bhopal has led to an increase in spontaneous abortions, stillbirths, infant mortality, and fetal abnormalities, no clinical or experimental studies on the reproductive toxicity of MIC were reported in scientific journal...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.8772153
更新日期:1987-06-01 00:00:00
abstract::In this study we investigated the risk of hearing loss among workers exposed to both toluene and noise. We recruited 58 workers at an adhesive materials manufacturing plant who were exposured to both toluene and noise [78.6-87.1 A-weighted decibels; dB(A)], 58 workers exposed to noise only [83.5-90.1 dB(A)], and 58 ad...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.8959
更新日期:2006-08-01 00:00:00
abstract::Numerous publications and reports have expressed health and safety concerns about the production and use of nanoparticles, especially in areas of exposure monitoring, personal use, and environmental fate and transport. We suggest that stable isotopic tracers, which have been used widely in the earth sciences and in me...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.9277
更新日期:2006-10-01 00:00:00
abstract::Stable associations of syntrophic fermentative organisms and populations that consume fermentation products play key roles in the anaerobic biodegradation of chlorinated organic contaminants. The involvement of these syntrophic populations is essential for mineralization of chlorinated aromatic compounds under methano...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.6933
更新日期:2005-03-01 00:00:00
abstract::Polychlorinated biphenyls (PCBs) are important environmental contaminants, and their toxicity to wildlife and humans are of major concern. PCBs form persistent and abundant metabolites, PCB methyl sulfones, that accumulate in biota. We now report that certain hydroxylated PCB metabolites show a strong and selective ac...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.94102464
更新日期:1994-05-01 00:00:00
abstract::Granular activated carbon (GAC), in the presence of dilute aqueous hypochlorite solutions typical of those used in water treatment, was converted to a reagent capable of carrying out free-radical coupling reactions and other oxidations of dilute aqueous solutions of phenols. The products included biphenyls with chlori...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.866997
更新日期:1986-11-01 00:00:00
abstract::The articles in this monograph focus on the mechanisms whereby ambient particulate matter (PM) and co-pollutants deposited in the respiratory tract cause cardiovascular and systemic effects, especially in persons with preexisting conditions such as allergic hyperresponsiveness and pulmonary, cardiac, and vascular dise...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.01109s4479
更新日期:2001-08-01 00:00:00
abstract:BACKGROUND:World Trade Center (WTC) rescue and recovery workers were exposed to a complex mix of pollutants and carcinogens. OBJECTIVE:The purpose of this investigation was to evaluate cancer incidence in responders during the first 7 years after 11 September 2001. METHODS:Cancers among 20,984 consented participants ...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1205894
更新日期:2013-06-01 00:00:00
abstract::For workers in the nuclear industry, the primary route for the entry of radioactive materials into the body is by inhalation, and the rate of clearance of particles from the pulmonary region of the lung is an important factor in determining radiation dose. It is the function of alveolar macrophages (AM) to maintain th...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.929769
更新日期:1992-07-01 00:00:00
abstract::During the last three decades, the use of modern organic synthetic pesticides has increased about 40-fold. Total U.S. production, for domestic and expert use, in 1976 was about 1.4 million pounds. Crops receiving the most intensive application of various pesticides were cotton for insecticides, corn for herbicides, an...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.7827103
更新日期:1978-12-01 00:00:00
abstract::According to current data, the capacity to cause nonprogrammed or unscheduled cell proliferation in target tissues, a common characteristic of chemical carcinogens, may play a more important role in the development of tumors than does genotoxicity. This paper provides strong support for the validity of this conclusion...
journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.9610440
更新日期:1996-01-01 00:00:00
abstract:BACKGROUND:Arsenic is metabolized through a series of oxidative methylation reactions by arsenic (3) methyltransferase (As3MT) to yield methylated intermediates. Although arsenic exposure is known to increase the risk of atherosclerosis, the contribution of arsenic methylation and As3MT remains undefined. OBJECTIVES:O...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/EHP806
更新日期:2017-07-05 00:00:00
abstract::We developed a sensitive and accurate analytical method for quantifying methyleugenol (ME) in human serum. Our method uses a simple solid-phase extraction followed by a highly specific analysis using isotope dilution gas chromatography-high resolution mass spectrometry. Our method is very accurate; its limit of detect...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.00108323
更新日期:2000-04-01 00:00:00
abstract::Metabolic enzymes involved in benzene activation or detoxification, including NAD(P)H, quinone oxidoreductase 1 (NQO1), cytochrome P450 2E1 (CYP2E1), myeloperoxidase (MPO), glutathione-S-transferase mu-1 (GSTM1), and glutathione-S-transferase theta-1 (GSTT1), were studied for their roles in human susceptibility to ben...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.021101213
更新日期:2002-12-01 00:00:00
abstract::This cross-sectional study examined the association between environmental lead measurements surrounding a Los Angeles County battery recycling facility and the blood lead levels of the children living nearby. Environmental lead measurements and blood lead levels of young children living in a community adjacent to a st...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.96104314
更新日期:1996-03-01 00:00:00
abstract::We report on findings from a 2-year follow-up study of immigrants originating from exposed areas around the site of the 1986 Chernobyl accident matched with comparison subjects emigrating from other republics in the Confederation of Independent States. In the initial study of 708 immigrants, the samples were matched b...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.97105s61545
更新日期:1997-12-01 00:00:00
abstract:OBJECTIVE:We reviewed the scientific background for the current health-based World Health Organization (WHO) guideline value for manganese in drinking water. DATA SOURCES AND EXTRACTION:The initial starting point was the background document for the development of the WHO's guideline value for manganese in drinking wat...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.10316
更新日期:2007-11-01 00:00:00
abstract::A potential connection exists between exposure to organochlorine chemicals and the increasing prevalence of endometriosis. Evidence shows that dioxin (2,3,7,8-tetrachlorodibenzo-p-dioxin) can increase the incidence and severity of the disease in monkeys and can promote the growth or survival of endometrial tissue impl...
journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.0211015
更新日期:2002-01-01 00:00:00
abstract::Many naturally occurring and man-made chemicals present in the environment possess estrogenic activity. Examples include plant and fungal products, pesticides, plasticizers, and other agricultural and industrial chemicals. These environmental estrogens as well as endogenous ovarian estrogens are thought to initiate th...
journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.95103s729
更新日期:1995-10-01 00:00:00
abstract::Methylcobalamin (methyl-B12) has been implicated in the biomethylation of the heavy metals (mercury, tin, platinum, gold, and thallium) as well as the metalloids (arsenic, selenium, tellurium and sulfur). In addition, methylcobalamin has been shown to react with lead, but the lead-alkyl product is unstable in water. D...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.771943
更新日期:1977-08-01 00:00:00
abstract:BACKGROUND:Most studies on endocrine-disrupting chemicals and breast cancer have focused on single compounds and have produced inconclusive findings. OBJECTIVES:We assessed the combined estrogenic effects of mixtures of xenoestrogens in serum and their relationship to breast cancer risk. METHODS:A total of 186 incide...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/EHP157
更新日期:2016-10-01 00:00:00
abstract::A wide variety of behavioral methods has been employed with animals to assess visual changes induced by drugs or toxicants. The methods range from simple to complex, from broad screening devices to narrowly focused techniques. Their relative advantages for the environmental toxicologist are discussed. Manipulation of ...
journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.782653
更新日期:1978-10-01 00:00:00