keyword
MENU ▼
Read by QxMD icon Read
search

Developmental Toxicity

keyword
https://www.readbyqxmd.com/read/29329878/course-dose-and-stage-dependent-toxic-effects-of-prenatal-dexamethasone-exposure-on-fetal-articular-cartilage-development
#1
Ze Chen, Zhe Zhao, Yunzepeng Li, Xingyu Zhang, Bin Li, Liaobin Chen, Hui Wang
Dexamethasone, a synthetic long-acting glucocorticoid, is routinely used for treating mothers at risk for preterm delivery. However, intrauterine overexposure to glucocorticoids induces low birth weight and cartilage dysplasia in offspring. Also, the "critical window" and safe dose of this treatment are largely unknown. This study investigated the course-, dose-, and stage-dependent toxic effects and the possible mechanisms of prenatal dexamethasone exposure (PDE) on fetal development and articular cartilage development...
January 9, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29325971/incorporation-of-fetal-and-child-pfoa-dosimetry-in-the-derivation-of-health-based-toxicity-values
#2
Kyra Kimberly Kieskamp, Rachel Rogers Worley, Eva D McLanahan, Marc-André Verner
BACKGROUND: Multiple agencies have developed health-based toxicity values for exposure to perfluorooctanoic acid (PFOA). Although PFOA exposure occurs in utero and through breastfeeding, current health-based toxicity values have not been derived using fetal or child dosimetry. Therefore, current values may underestimate the potential risks to fetuses and nursing infants. OBJECTIVE: Using fetal and child dosimetry, we aimed to calculate PFOA maternal human equivalent doses (HEDs), corresponding to a developmental mouse study lowest observed adverse effect level (LOAEL, 1mg/kg/day)...
December 23, 2017: Environment International
https://www.readbyqxmd.com/read/29325626/fragile-x-syndrome-and-fragile-x-associated-tremor-ataxia-syndrome
#3
Deborah A Hall, Elizabeth Berry-Kravis
Fragile X-associated disorders encompass several conditions, which are caused by expansion mutations in the fragile X mental retardation 1 (FMR1) gene. Fragile X syndrome is the most common inherited etiology of intellectual disability and results from a full mutation or >200 CGG repeats in FMR1. It is associated with developmental delay, autism spectrum disorder, and seizures. Fragile X-associated tremor/ataxia syndrome is a progressive neurodegenerative disease that occurs in premutation carriers of 55-200 CGG repeats in FMR1 and is characterized by kinetic tremor, gait ataxia, parkinsonism, executive dysfunction, and neuropathy...
2018: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/29324453/developmental-origins-of-health-span-and-life-span-a-mini-review
#4
Joshua D Preston, Leryn J Reynolds, Kevin J Pearson
BACKGROUND: A vast body of research has demonstrated that disease susceptibility and offspring health can be influenced by perinatal factors, which include both paternal and maternal behavior and environment. Offspring disease risk has the potential to affect the health span and life span of offspring. KEY FINDINGS: Various maternal factors, such as environmental toxicant exposure, diet, stress, exercise, age at conception, and longevity have the potential to influence age-associated diseases such as cardiovascular disease, obesity, diabetes, and cancer risk in offspring...
January 12, 2018: Gerontology
https://www.readbyqxmd.com/read/29323882/quantitative-shotgun-proteomics-associates-molecular-level-cadmium-toxicity-responses-with-compromised-growth-and-reproduction-in-a-marine-copepod-under-multigenerational-exposure
#5
Minghua Wang, Chen Zhang, Jae-Seong Lee
In this study, the copepod Tigriopus japonicus was exposed to different cadmium (Cd) treatments (0, 2.5, 5, 10 and 50 µg/L in seawater) for five generations (F0-F4), followed by a two-generation (F5-F6) recovery period in clean seawater. Six life-history traits (survival, developmental time of nauplius phase, developmental time to maturation, number of clutches, number of nauplii/clutch, and fecundity) were examined for each generation. Metal accumulation was also analyzed for generations F0-F6. Additionally, proteome profiling was performed for the control and 50 µg/L Cd-treated F4 copepods...
January 11, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29322640/conserved-roles-of-osiris-genes-in-insect-development-polymorphism-and-protection
#6
Chris R Smith, Claire Morandin, Moataz Noureddine, Swati Pant
Much of the variation among insects is derived from the different ways that chitin has been molded to form rigid structures, both internal and external. In this study, we identify a highly conserved expression pattern in an insect-only gene family, the Osiris genes, that is essential for development, but also plays a significant role in phenotypic plasticity and in immunity/toxicity responses. The majority of Osiris genes exist in a highly syntenic cluster, and the cluster itself appears to have arisen very early in the evolution of insects...
January 10, 2018: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/29321347/identification-of-housekeeping-genes-as-references-for-quantitative-real-time-rt-pcr-analysis-in-misgurnus-anguillicaudatus
#7
Xiaohua Xia, Weiran Huo, Ruyan Wan, Xiaopei Xia, Qiyan Du, Zhongjie Chang
Quantitative real-time reverse transcription-polymerase chain reaction (qRT-PCR) is a well-known method to quantify gene expression by comparing with the reference genes. Generally, housekeeping genes were set as references, as for their stable expression in varying conditions. Here, we try to evaluate few of such genes to identify suitable housekeeping genes as references for qRT-PCR analysis of gene expression in Misgurnus anguillicaudatus. This study evaluated the expression of four commonly used housekeeping genes, i...
December 2017: Journal of Genetics
https://www.readbyqxmd.com/read/29316351/gestational-triphenyl-phosphate-exposure-in-c57bl-6-mice-perturbs-expression-of-insulin-like-growth-factor-signaling-genes-in-maternal-and-fetal-liver
#8
Nicola A Philbrook, Victoria E Restivo, Christine L Belanger, Louise M Winn
Triphenyl phosphate (TPhP) is an organophosphorus flame retardant and plasticizer that has been added to numerous consumer products in recent years. TPhP is not overtly toxic, however recent studies have suggested that it may have metabolic disrupting effects following developmental exposure. The present study aimed to investigate the developmental and potential metabolic effects of TPhP in a murine model. C57Bl/6 dams were exposed on gestational days (GD) 8, 10, 12, and 14 to 0, 5, 25, or 50 mg/kg TPhP via intraperitoneal injection...
January 8, 2018: Birth Defects Research
https://www.readbyqxmd.com/read/29313347/identification-of-metabolism-and-excretion-differences-of-procymidone-between-rats-and-humans-using-chimeric-mice-implications-for-differential-developmental-toxicity
#9
Jun Abe, Yoshitaka Tomigahara, Hirokazu Tarui, Rie Omori, Satoshi Kawamura
A metabolite of procymidone, Hydroxylated-PCM, causes rat-specific developmental toxicity due to higher exposure to it in rats than in rabbits or monkeys. When procymidone was administered to chimeric mice with rat or human hepatocytes, the plasma level of Hydroxylated-PCM was higher than that of procymidone in rat chimeric mice, and the metabolic profile of procymidone in intact rats was well reproduced in rat chimeric mice. In human chimeric mice, the plasma level of Hydroxylated-PCM was less, resulting in a much lower exposure...
January 9, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29313302/combined-effects-of-insecticide-exposure-and-predation-risk-on-freshwater-detritivores
#10
Andreia C M Rodrigues, Maria D Bordalo, Oksana Golovko, Olga Koba, Carlos Barata, Amadeu M V M Soares, João L T Pestana
Insecticides usually present in low concentrations in streams are known to impair behaviour and development of non-target freshwater invertebrates. Moreover, there is growing awareness that the presence of natural stressors, such as predation risk may magnify the negative effects of pesticides. This is because perception of predation risk can by itself lead to changes on behaviour and physiology of prey species. To evaluate the potential combined effects of both stressors on freshwater detritivores we studied the behavioural and developmental responses of Chironomus riparius to chlorantraniliprole (CAP) exposure under predation risk...
January 8, 2018: Ecotoxicology
https://www.readbyqxmd.com/read/29310433/occurrence-and-tissue-distribution-of-novel-perfluoroether-carboxylic-and-sulfonic-acids-and-legacy-per-polyfluoroalkyl-substances-in-black-spotted-frog-pelophylax-nigromaculatus
#11
Qianqian Cui, Yitao Pan, Hongxia Zhang, Nan Sheng, Jianshe Wang, Yong Guo, Jiayin Dai
Research on perfluoroalkyl substances (PFASs) continues to grow. However, very little is known about these substances in amphibians. Here we report for the first time on the occurrence, tissue distribution, and bioaccumulation of two novel PFASs, chlorinated polyfluorinated ether sulfonic acid (6:2 Cl-PFESA) and hexafluoropropylene oxide trimer acid (HFPO-TA), in the black-spotted frog (Pelophylax nigromaculatus) from China. Frogs from cities with large-scale fluorochemical industries had significantly greater liver ΣPFAS levels (mean 54...
January 9, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29305948/determination-of-developmental-toxicity-of-zebrafish-exposed-to-propyl-gallate-dosed-lower-than-adi-acceptable-daily-intake
#12
Alper Baran, Mine Köktürk, Muhammed Atamanalp, Saltuk Buğrahan Ceyhun
Propyl gallate (PG) is an antioxidant substance widely used in cosmetics, pharmaceutical and food industries. The aim of this study was to evaluate the potential toxic effect of PG injected to zebrafish embryos. To this end, zebrafish embryos were exposed to PG with 0, 1, 10 and 50 ppm concentrations which are lower than ADI and were monitored at 24, 48, 72 and 96 hpf. Survival rate, hatching rate and malformations were evaluated during this period. Moreover, it has been detected the accumulation of fluorescence signal of ROS and apoptotic cell in whole body at the end of 96 hpf...
January 3, 2018: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/29304412/developmental-toxicity-and-potential-mechanisms-of-pyraoxystrobin-to-zebrafish-danio-rerio
#13
Hui Li, Song Yu, Fangjie Cao, Chengju Wang, Mingqi Zheng, Xuefeng Li, Lihong Qiu
As a newly developed, highly efficient strobilurin fungicide, pyraoxystrobin has been reported to be highly toxic to some aquatic organisms. However, the toxicity of pyraoxystrobin to different life stages of fish and the potential underlying mechanisms are still unknown. Hence, in the present study, the acute toxicity of pyraoxystrobin to different life stages of zebrafish (embryo, larva, and adult) was assessed. The developmental toxicity of pyraoxystrobin to zebrafish embryos and its effects on gene transcription in the embryo were also investigated...
January 2, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29296563/single-repeated-dose-toxicity-and-genotoxicity-assessment-of-herb-formula-kiom2012h
#14
Hwayong Park, Youn-Hwan Hwang, Jin Yeul Ma
Background: Traditional medicine and herbal prescriptions are becoming more popular, and they account for a large share of the world's healthcare research studies, developments, and market demands. Increasing scientific evidence of the substantive efficacies such as preventive health keeping pharmaceutical materials and dietary supplements can be found elsewhere. Above all, safety should be the critical premise for considering developmental materials such as pharmaceuticals without side effects and toxicity...
December 2017: Integrative Medicine Research
https://www.readbyqxmd.com/read/29287281/comparative-analysis-of-the-transcriptome-responses-of-zebrafish-embryos-after-exposure-to-low-concentrations-of-cadmium-cobalt-and-copper
#15
Laura Sonnack, Thorsten Klawonn, Ralf Kriehuber, Henner Hollert, Christoph Schäfers, Martina Fenske
Metal toxicity is a global environmental challenge. Fish are particularly prone to metal exposure, which can be lethal or cause sublethal physiological impairments. The objective of this study was to investigate how adverse effects of chronic exposure to non-toxic levels of essential and non-essential metals in early life stage zebrafish may be explained by changes in the transcriptome. We therefore studied the effects of three different metals at low concentrations in zebrafish embryos by transcriptomics analysis...
December 15, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/29287174/effects-of-triphenyl-phosphate-on-growth-reproduction-and-transcription-of-genes-of-daphnia-magna
#16
Siliang Yuan, Han Li, Yao Dang, Chunsheng Liu
The additive flame retardant triphenyl phosphate (TPHP) has been frequently detected in environments and biota. Evidences indicate that TPHP has potential risks to aquatic organisms. Seldom has been reported about its chronic effects to aquatic organism at low trophic levels, such as Cladocera. In the present study, <12 h old Daphnia magna (D. magna) were exposed to 0, 5, 50 or 500 μg/L TPHP for 21 days to investigate the chronic effects of TPHP on body length, fecundity and survival. Meanwhile, D...
December 23, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29280981/%C3%AE-n-methylamino-l-alanine-bmaa-toxicity-is-gender-and-exposure-age-dependent-in-rats
#17
Laura Louise Scott, Timothy Grant Downing
Cyanobacterial β-N-methylamino-L-alanine (BMAA) has been suggested as a causative or contributory factor in the development of several neurodegenerative diseases. However, no BMAA animal model has adequately shown clinical or behavioral symptoms that correspond to those seen in either Alzheimer's Disease (AD), Amyotrophic Lateral Sclerosis (ALS) or Parkinson's Disease (PD). We present here the first data that show that when neonatal rats were exposed to BMAA on postnatal days 3, 4 and 5, but not on gestational day 14 or postnatally on days 7 or 10, several AD and/or PD-related behavioral, locomotor and cognitive deficits developed...
December 27, 2017: Toxins
https://www.readbyqxmd.com/read/29280155/nanosecond-pulsed-electric-field-incorporation-technique-to-predict-molecular-mechanisms-of-teratogenicity-and-developmental-toxicity-of-estradiol-17%C3%AE-on-medaka-embryos
#18
Akemi Yamaguchi, Hiroshi Ishibashi, Susumu Kono, Midori Iida, Masaya Uchida, Koji Arizono, Nobuaki Tominaga
Herein, we propose using a nanosecond pulsed electric field (nsPEF) technique to assess teratogenicity and embryonic developmental toxicity of estradiol-17β (E2 ) and predict the molecular mechanisms of teratogenicity and embryonic developmental defects caused by E2 on medaka (Oryzias latipes). The 5 hour post-fertilization embryos were exposed to co-treatment with 10 μm E2 and nsPEF for 2 hours and then continuously cultured under non-E2 and nsPEF conditions until hatching. Results documented that the time to hatching of embryos was significantly delayed in comparison to the control group and that typical abnormal embryo development, such as the delay of blood vessel formation, was observed...
December 27, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29278994/regulatory-forum-opinion-piece-effective-brain-trimming-for-regulatory-type-nonclinical-toxicity-studies
#19
Brad Bolon
Regulatory guidances for nonclinical toxicity testing require brain evaluation but do not require a specific analytical strategy. The Society of Toxicologic Pathology (STP) has produced "best practice" recommendations for brain sampling and processing in general toxicity (GT) studies in adult rodents and nonrodents as well as developmental neurotoxicity (DNT) studies in rodents. This article explains acceptable brain trimming strategies as described in these 2 STP documents. Figures in the DNT and GT "best practices" illustrate coronal brain trimming at specific levels as defined by discrete external and internal anatomic landmarks...
January 1, 2017: Toxicologic Pathology
https://www.readbyqxmd.com/read/29278699/perinatal-development-of-bitter-taste-avoidance-behavior-in-mice-is-associated-with-actin-dependent-localization-of-bitter-taste-receptors-to-the-microvilli-of-taste-cells
#20
Atsuko Yamashita, Kaori Kondo, Yoshimi Kunishima, Sachiko Iseki, Takashi Kondo, Masato S Ota
Bitter taste avoidance behavior (BAB) plays a fundamental role in the avoidance of toxic substances with a bitter taste. However, the molecular basis underlying the development of BAB is unknown. To study critical developmental events by which taste buds turn into functional organs with BAB, we investigated the early phase development of BAB in postnatal mice in response to bitter-tasting compounds, such as quinine and thiamine. Postnatal mice started to exhibit BAB for thiamine and quinine at postnatal day 5 (PD5) and PD7, respectively...
December 23, 2017: Biochemical and Biophysical Research Communications
keyword
keyword
111805
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"