Abstract:
:To examine the effects of dibutyl phthalate (DBP) on gonadal sex differentiation, genetically male tadpoles of Rana rugosa were exposed to dilute solutions of DBP at concentrations of 0.1, 1, or 10 microM during days 19-23 after fertilization, which is the critical period of gonadal sex differentiation in R. rugosa. Tadpoles were necropsied on day 40. The genetically male tadpoles were produced from crossings between males (ZZ) of one local population, in which females are the heterogametic sex, and females (XX) of another local population, in which males are the heterogametic sex. As positive control groups, tadpoles were exposed to dilute solutions of 17beta-estradiol (E(2)) at concentrations of 0. 01, 0.1, or 1 microM during the same period. The internal structure of the gonads was histologically examined in a total of 30 control tadpoles, 86 E(2)-treated tadpoles, and 90 DBP-treated tadpoles. The gonads of the control tadpoles all showed the typical structure of testes. In contrast, 0.01, 0.1, and 1 microM E(2) treatments caused the undifferentiated gonads of 18, 63, and 100% of the tadpoles, respectively, to develop into gonads of complete or partial ovarian structure. After 0.1, 1, and 10 microM DBP treatment, 0, 7, and 17% of tadpoles, respectively, were similarly affected. These findings suggest that DBP was about 1,000-fold less potent than E(2). Nevertheless, DBP is an environmentally dangerous hormone that disrupts the pathways of testicular differentiation in genetically male animals.
journal_name
Environ Health Perspectjournal_title
Environmental health perspectivesauthors
Ohtani H,Miura I,Ichikawa Ydoi
10.1289/ehp.001081189subject
Has Abstractpub_date
2000-12-01 00:00:00pages
1189-93issue
12eissn
0091-6765issn
1552-9924pii
sc271_5_1835journal_volume
108pub_type
杂志文章abstract::An estimated 8000 children 0 to 14 years of age are diagnosed annually with cancer in the United States. Leukemia and brain tumors are the most common childhood malignancies, accounting for 30 and 20% of newly diagnosed cases, respectively. From 1975 to 1978 to 1987 to 1990, cancer among white children increased sligh...
journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.95103s6177
更新日期:1995-09-01 00:00:00
abstract::We present a model of the distribution of noise annoyance with the mean varying as a function of the noise exposure. Day-night level (DNL) and day-evening-night level (DENL) were used as noise descriptors. Because the entire annoyance distribution has been modeled, any annoyance measure that summarizes this distributi...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.01109409
更新日期:2001-04-01 00:00:00
abstract::Metallothionein from livers of mice was isolated by gel chromatography and isoelectric focusing. One of two forms thus obtained contained 32 percent cysteine. This form, labeled in vitro with 109Cd, was injected intravenously in mice, and the distribution of 109Cd was studied. Animals killed after 4 hrs had over 80 pe...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.7512103
更新日期:1975-12-01 00:00:00
abstract:BACKGROUND:In the United States, most of the treated sewage sludge (biosolids) is applied to farmland as a soil amendment. Critics suggest that rules regulating sewage sludge treatment and land application may be insufficient to protect public health and the environment. Neighbors of land application sites report illne...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1205470
更新日期:2013-05-01 00:00:00
abstract:BACKGROUND:Exceptional aging, defined as reaching age 85 years, shows geographic inequalities that may depend on local environmental conditions. Links between particulate pollution-a well-recognized environmental risk factor-and exceptional aging have not been investigated. OBJECTIVES:We conducted a nationwide analysi...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/EHP197
更新日期:2016-11-01 00:00:00
abstract::Naturally occurring radon is a relatively ubiquitous environmental carcinogen to which large numbers of people can be exposed over their lifetimes. The accumulation of radon in homes, therefore, has led to a large program to determine the effects of the densely ionizing alpha particles that are produced when radon dec...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.93101s373
更新日期:1993-10-01 00:00:00
abstract::Flavone and isoflavone phytoestrogens are plant chemicals and are known to be competitive inhibitors of cytochrome P450 aromatase with respect to the androgen substrate. Aromatase is the enzyme that converts androgen to estrogen; therefore, these plant chemicals are thought to be capable of modifying the estrogen leve...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.9810685
更新日期:1998-02-01 00:00:00
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journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.97105850
更新日期:1997-08-01 00:00:00
abstract::The presence of mycotoxins in grains is well documented. Workers in grain handling occupations are commonly exposed to grain dust aerosols. Work in our laboratory has shown that T-2 toxin is highly toxic to rat alveolar macrophages in vitro, causing loss of viability, release of radiolabeled chromium, inhibition of ma...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.866645
更新日期:1986-04-01 00:00:00
abstract:BACKGROUND:There is general concern that persistent organic pollutants (POPs) found in the environment, wildlife, food, water, house dust, human tissues, and fluids may alter normal human physiologic activities (e.g., fetal development, immune and endocrine systems). Although the levels of some POPs [polychlorinated bi...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.0800205
更新日期:2009-04-01 00:00:00
abstract::Biological markers of intermediate health outcomes sometimes provide a superior alternative to traditional measures of pollutant-related disease. Some opportunities and methodologic issues associated with using markers are discussed in the context of exposures to four complex mixtures: environmental tobacco smoke and ...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.93101s4193
更新日期:1993-12-01 00:00:00
abstract::The significance of the environment for health is increasingly being recognized. There is a need for systematic approaches to assessment of environmental factors most relevant to health, health outcomes most influenced by the environment, and the relationships between them, as well as for approaches to representing th...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.8321
更新日期:2006-03-01 00:00:00
abstract::In August 1997 we performed a follow-up survey of 146 lead-poisoned children from a community near a previously active auto battery recycling smelter in Haina near Santo Domingo, Dominican Republic. Our follow-up survey confirmed a severe incidence of elevated blood lead (BPb) and erythrocyte protoporphyrin/zinc proto...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.99107917
更新日期:1999-11-01 00:00:00
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journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1306925
更新日期:2014-05-01 00:00:00
abstract::During 1992 and 1993 the Wisconsin Division of Health investigated five cases in which copper-contaminated drinking water was suspected of causing gastrointestinal upsets. Each of these case studies was conducted after our office was notified of high copper levels in drinking water or notified of unexplained illnesses...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.94102958
更新日期:1994-11-01 00:00:00
abstract::The knowledge of specific problems of occupational cancer in Spain is scarce. The environment of the workplace has improved over the last few years after a long period distinguished by bad working conditions, incomplete legislation, and insufficient safety measures and control. It has been estimated that 3,083,479 wor...
journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.107-1566267
更新日期:1999-05-01 00:00:00
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journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.99107s5679
更新日期:1999-10-01 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:BACKGROUND:Recent findings suggest that maternal smoking during pregnancy may play a role in the development of metabolic alterations in offspring during childhood. However, whether such exposure increases the risk of developing similar metabolic alterations during adulthood is uncertain. OBJECTIVE:We evaluated the as...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1104563
更新日期:2012-11-01 00:00:00
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journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1003348
更新日期:2011-11-01 00:00:00
abstract::Scaling of the quantified dispositional parameters of xenobiotics from animals to man is of interest from the standpoint of toxicology (e.g., poisoning and risk assessment). Scaling is also important from the standpoint of therapeutics because it represents a strategy for predicting first-use-in-human doses in clinica...
journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.96104400
更新日期:1996-04-01 00:00:00
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journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/EHP39
更新日期:2017-04-01 00:00:00
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journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.834943
更新日期:1983-03-01 00:00:00
abstract::Short articles on the following topics: *NIEHS Strategic Plan: New Frontiers in Environmental Sciences and Human Health; Beyond the Bench: Environmental Health Nursing: Putting Knowledge into Practice; Headliners: Inhibition of RLIP76 Causes Complete Regression of Melanoma in Mice. ...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:
更新日期:2006-05-01 00:00:00
abstract::Soil ingestion estimates play an important role in risk assessment of contaminated sites, and estimates of soil ingestion in children are of special interest. Current estimates of soil ingestion are trace-element specific and vary widely among elements. Although expressed as daily estimates, the actual estimates have ...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.95103276
更新日期:1995-03-01 00:00:00
abstract::The chlorinated hydrocarbons chloroform (CHCl3), 1,1-dichlorethane (1,1-DCE) and 1,2-dichloroethane (1,2-DCE) have been detected in finished drinking water. When administered to B6C3F1 mice by gavage in corn oil, these compounds have been shown to induce hepatic tumors. The present study examines the effect on liver t...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.866989
更新日期:1986-11-01 00:00:00
abstract:BACKGROUND:Prostaglandins (PGs) play key roles in development and maintenance of homeostasis of the adult body. Despite these important roles, it remains unclear whether the PG pathway is a target for endocrine disruption. However, several known endocrine-disrupting compounds (EDCs) share a high degree of structural si...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1002635
更新日期:2011-04-01 00:00:00
abstract:BACKGROUND:Polybrominated diphenyl ethers (PBDEs) are persistent chemicals that have been widely used as flame retardants in furniture, carpet padding, car seats, and other consumer products during the past three decades. OBJECTIVE:We examined whether in utero exposure to PBDEs is associated with child cognitive funct...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1307562
更新日期:2014-08-01 00:00:00
abstract:BACKGROUND:Studies estimating health effects of long-term air pollution exposure often use a two-stage approach: building exposure models to assign individual-level exposures, which are then used in regression analyses. This requires accurate exposure modeling and careful treatment of exposure measurement error. OBJEC...
journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.1206010
更新日期:2013-09-01 00:00:00
abstract::The findings of studies investigating whether exposures to ionizing radiation before birth, either pre- or post-conception, increase the risk of childhood cancer have provoked much scientific controversy. An epidemiological association between the abdominal exposure of pregnant women to diagnostic X-rays and childhood...
journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
doi:10.1289/ehp.951031018
更新日期:1995-11-01 00:00:00