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1.
Artigo em Inglês | MEDLINE | ID: mdl-33923240

RESUMO

Foreign body giant cell (FBGC) reaction to silicone material in the lymph nodes of patients with silicone breast implants has been documented in the literature, with a number of case reports dating back to 1978. Many of these case reports describe histologic features of silicone lymphadenopathy in regional lymph nodes from patients with multiple sets of different types of implants, including single lumen smooth surface gel, single lumen textured surface gel, single lumen with polyethylene terephthalate patch, single lumen with polyurethane coating, and double lumen smooth surface. Only one other case report described a patient with highly-cohesive breast implants and silicone granulomas of the skin. In this article, we describe a patient with a clinical presentation of systemic sarcoidosis following highly cohesive breast implant placement. Histopathologic analysis and Confocal Laser Raman Microprobe (CLRM) examination were used to confirm the presence of silicone in the axillary lymph node and capsular tissues. This is the first report where chemical spectroscopic mapping has been used to establish and identify the coexistence of Schaumann bodies, consisting of calcium oxalate and calcium phosphate minerals, together with silicone implant material.


Assuntos
Implante Mamário , Implantes de Mama , Implantes de Mama/efeitos adversos , Granuloma , Humanos , Lasers , Géis de Silicone/efeitos adversos
2.
Appl Spectrosc ; 75(6): 661-673, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33231488

RESUMO

Many medical devices contain metals that interface with the body. Additionally, embedded metal fragments from military wounds are typically not removed, to avoid the risk of morbidity associated with invasive surgery. The long-term health consequences of many of these materials are not thoroughly understood. To this end, we have exposed rats for up to one year to implanted single-element metal pellets of any one of Al, Co, Cu, Fe, Ni, Pb, Ta, or W. Various tissues were harvested and flash frozen for analysis of their metal distribution. We discuss approaches to most thoroughly and reliably evaluate the distribution of metal in these tissues. The path to the most appropriate analytical technique took us through extensive examination of the tissues using scanning electron microscopy with energy dispersive X-ray spectroscopy (XPS), X-ray photoelectron spectroscopy (XPS), and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Though any one of these methods is highly relied upon in surface chemistry analysis, LA-ICP-MS alone showed presence of metal in the tissue. This information will help build robust methods to bridge the gap in our understanding of biosolubility and distribution of embedded metal throughout the body.


Assuntos
Terapia a Laser , Metais , Animais , Microscopia Eletrônica de Varredura , Ratos , Análise Espectral
3.
Biol Trace Elem Res ; 190(1): 45-51, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-30293130

RESUMO

Environmental metal exposure, as well as dietary metals, may adversely affect semen quality even as others play an essential role in normal spermatogenesis and fertility. Measures of seminal fluid metals have therefore been of high interest in the last several decades but have shown inconsistent results in correlations with some semen quality parameters. As well, environmental metal measures across various body fluid matrices have not been consistently correlated contrary to what one might hypothesize based on a systemic body burden of metal. This may be due to the body fluid matrices assessed and to other differences in laboratory methods and sample preparation. Measures of uranium, a potentially toxic metal in humans, have not previously been reported in the semen of environmentally metal-exposed populations. We report here uranium seminal fluid results and the high correlation of uranium concentrations across several body fluid matrices in a cohort of military veterans exposed to depleted uranium in combat events during the Iraqi Gulf War. These results inform the risk communication conversation for exposed populations and broaden the public health assessments from various exposure scenarios.


Assuntos
Sêmen/metabolismo , Urânio/sangue , Líquidos Corporais/química , Estudos de Coortes , Exposição Ambiental/efeitos adversos , Guerra do Golfo , Humanos , Masculino , Exposição Ocupacional/efeitos adversos , Análise do Sêmen/métodos , Veteranos
4.
Mol Ther Methods Clin Dev ; 10: 165-178, 2018 Sep 21.
Artigo em Inglês | MEDLINE | ID: mdl-30090842

RESUMO

Menkes disease is a lethal neurodegenerative disorder of copper metabolism caused by mutations in an evolutionarily conserved copper transporter, ATP7A. Based on our prior clinical and animal studies, we seek to develop a therapeutic approach suitable for application in affected human subjects, using the mottled-brindled (mo-br) mouse model that closely mimics the Menkes disease biochemical and clinical phenotypes. Here, we evaluate the efficacy of low-, intermediate-, and high-dose recombinant adeno-associated virus serotype 9 (rAAV9)-ATP7A delivered to the cerebrospinal fluid (CSF), in combination with subcutaneous administration of clinical-grade copper histidinate (sc CuHis, IND #34,166). Mutant mice that received high-dose (1.6 × 1010 vg) cerebrospinal fluid-directed rAAV9-rsATP7A plus sc copper histidinate showed 53.3% long-term (≥300-day) survival compared to 0% without treatment or with either treatment alone. The high-dose rAAV9-rsATP7A plus sc copper histidinate-treated mutant mice showed increased brain copper levels, normalized brain neurochemical levels, improvement of brain mitochondrial abnormalities, and normal growth and neurobehavioral outcomes. This synergistic treatment effect represents the most successful rescue to date of the mo-br mouse model. Based on these findings, and the absence of a large animal model, we propose cerebrospinal fluid-directed rAAV9-rsATP7A gene therapy plus subcutaneous copper histidinate as a potential therapeutic approach to cure or ameliorate Menkes disease.

5.
Neuromodulation ; 21(2): 117-125, 2018 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28782181

RESUMO

OBJECTIVE: The Shannon model is often used to define an expected boundary between non-damaging and damaging modes of electrical neurostimulation. Numerous preclinical studies have been performed by manufacturers of neuromodulation devices using different animal models and a broad range of stimulation parameters while developing devices for clinical use. These studies are mostly absent from peer-reviewed literature, which may lead to this information being overlooked by the scientific community. We aimed to locate summaries of these studies accessible via public regulatory databases and to add them to a body of knowledge available to a broad scientific community. METHODS: We employed web search terms describing device type, intended use, neural target, therapeutic application, company name, and submission number to identify summaries for premarket approval (PMA) devices and 510(k) devices. We filtered these records to a subset of entries that have sufficient technical information relevant to safety of neurostimulation. RESULTS: We identified 13 product codes for 8 types of neuromodulation devices. These led us to devices that have 22 PMAs and 154 510(k)s and six transcripts of public panel meetings. We found one PMA for a brain, peripheral nerve, and spinal cord stimulator and five 510(k) spinal cord stimulators with enough information to plot in Shannon coordinates of charge and charge density per phase. CONCLUSIONS: Analysis of relevant entries from public regulatory databases reveals use of pig, sheep, monkey, dog, and goat animal models with deep brain, peripheral nerve, muscle and spinal cord electrode placement with a variety of stimulation durations (hours to years); frequencies (10-10,000 Hz) and magnitudes (Shannon k from below zero to 4.47). Data from located entries indicate that a feline cortical model that employs acute stimulation might have limitations for assessing tissue damage in diverse anatomical locations, particularly for peripheral nerve and spinal cord simulation.


Assuntos
Bases de Dados Factuais/normas , Aprovação de Equipamentos/legislação & jurisprudência , Aprovação de Equipamentos/normas , Terapia por Estimulação Elétrica , Neurotransmissores , Animais , Encéfalo/fisiologia , Bases de Dados Factuais/legislação & jurisprudência , Terapia por Estimulação Elétrica/instrumentação , Terapia por Estimulação Elétrica/métodos , Terapia por Estimulação Elétrica/normas , Humanos
6.
J Occup Environ Med ; 59(11): 1056-1062, 2017 11.
Artigo em Inglês | MEDLINE | ID: mdl-28759480

RESUMO

OBJECTIVE: To characterize systemic metal exposures from retained fragments in a cohort of war-injured US Veterans enrolled in the Department of Veterans Affairs' Embedded Fragment Registry. METHODS: Five hundred seventy nine registry-enrolled Veterans submitted an exposure questionnaire and urine sample for analyses of 14 metals often found in fragments. Urine metal results were compared with reference values of unexposed populations to identify elevations. RESULTS: 55% of Veterans had normal urine metal values. When observed, tungsten and zinc were the metals most frequently elevated, followed by cobalt; however, cobalt levels were not associated with a fragment source, but with surgical implants present. CONCLUSIONS: Though most metal elevations observed are not significantly outside the normal range, on-going accrual of metal burdens in these Veterans over time recommends continued surveillance which may inform future medical management.


Assuntos
Corpos Estranhos/urina , Metais/urina , Vigilância da População , Veteranos , Lesões Relacionadas à Guerra/urina , Ferimentos Penetrantes/urina , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Sistema de Registros , Inquéritos e Questionários , Tungstênio/urina , Estados Unidos , Adulto Jovem , Zinco/urina
7.
Environ Res ; 152: 175-184, 2017 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-27792941

RESUMO

BACKGROUND: A small group of Gulf War I veterans wounded in depleted uranium (DU) friendly-fire incidents have been monitored for health changes in a clinical surveillance program at the Veterans Affairs Medical Center, Baltimore since 1994. METHODS: During the spring of 2015, an in-patient clinical surveillance protocol was performed on 36 members of the cohort, including exposure monitoring for total and isotopic uranium concentrations in urine and a comprehensive assessment of health outcomes. RESULTS: On-going mobilization of U from embedded fragments is evidenced by elevated urine U concentrations. The DU isotopic signature is observed principally in participants possessing embedded fragments. Those with only an inhalation exposure have lower urine U concentration and a natural isotopic signature. CONCLUSIONS: At 25 years since first exposure to DU, an aging cohort of military veterans continues to show no U-related health effects in known target organs of U toxicity. As U body burden continues to accrue from in-situ mobilization from metal fragment depots, and increases with exposure duration, critical tissue-specific U concentration thresholds may be reached, thus recommending on-going surveillance of this veteran cohort.


Assuntos
Guerra do Golfo , Militares/estatística & dados numéricos , Exposição Ocupacional , Urânio/toxicidade , Veteranos/estatística & dados numéricos , Baltimore , Estudos Longitudinais
8.
Mil Med ; 181(6): e625-9, 2016 06.
Artigo em Inglês | MEDLINE | ID: mdl-27244078

RESUMO

A frequent comorbidity of traumatic injury due to a blast or explosion, commonly reported in Iraq and Afghanistan veterans, is that of retained embedded fragments typically of unknown content. Because of concerns over both local and systemic health effects related to both the physical presence of and mobilization of materials from embedded fragments, the Department of Veterans Affairs established a surveillance program for this group of veterans. We present here the case of a surveillance-enrolled veteran who submitted: (1) three surgically removed fragments for content analyses, (2) tissue adhered to the fragments for histology and metal concentration evaluation, and (3) pre- and postfragment removal urine samples to assess concentrations of various metals often found in fragments. Results indicate that removed fragments were aluminum-copper alloys. Surrounding tissue analyses revealed elevated concentrations of these metals and evidence of chronic inflammation, but no neoplastic changes. Urine aluminum concentrations, initially elevated compared to normal population values, decreased significantly after fragment removal, illustrating the utility of urine biomonitoring to provide insight into fragment composition. A medical surveillance program integrating fragment composition data, tissue analyses, and repeat urine biomonitoring can help inform the patient-specific medical management of both the local and systemic effects of retained metal fragments.


Assuntos
Traumatismos por Explosões/complicações , Corpos Estranhos/cirurgia , Alumínio/urina , Cobre/urina , Monitoramento Ambiental/métodos , Corpos Estranhos/complicações , Humanos , Guerra do Iraque 2003-2011 , Masculino , Espectrometria de Massas/métodos , Exposição Ocupacional/efeitos adversos , Inquéritos e Questionários , Estados Unidos , Veteranos , Adulto Jovem
9.
Am J Ind Med ; 58(6): 583-94, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25907888

RESUMO

BACKGROUND: A small group of Gulf War I veterans wounded in depleted uranium (DU) friendly fire incidents have been monitored in a clinical surveillance program at the Veterans Affairs Medical Center, Baltimore since 1994. METHODS: An in-patient clinical surveillance protocol was performed on 35 members of the cohort, including exposure monitoring for total and isotopic uranium concentrations in urine and a comprehensive assessment of health outcomes. RESULTS: Although urine U concentrations continue to be elevated in this group, illustrating on-going in situ mobilization of U from embedded fragments, no consistent U-related health effects have been observed. CONCLUSIONS: Now more than 20 years since first exposure to DU, an aging cohort of military veterans continues to show no U-related health effects in known target organs of U toxicity. As tissue concentrations continue to accrue with exposure duration, critical tissue-specific U concentration thresholds may be reached, thus recommending on-going surveillance of this veteran cohort.


Assuntos
Monitoramento Ambiental/estatística & dados numéricos , Vigilância da População/métodos , Urânio/urina , Veteranos/estatística & dados numéricos , Exposição à Guerra/efeitos adversos , Adulto , Biomarcadores/análise , Biomarcadores/urina , Osso e Ossos/metabolismo , Guerra do Golfo , Humanos , Isótopos/toxicidade , Isótopos/urina , Testes de Função Renal , Estudos Longitudinais , Pulmão/efeitos da radiação , Metais/urina , Pessoa de Meia-Idade , Estados Unidos , United States Department of Veterans Affairs , Urânio/toxicidade
10.
Mol Genet Metab ; 113(4): 294-300, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25456742

RESUMO

Mottled-dappled (Mo-dp) is a mouse model of Menkes disease caused by a large, previously uncharacterized deletion in the 5' region of Atp7a, the mouse ortholog of ATP7A. Affected mutants die in utero at embryonic day 17, and show bending and thickening of the ribs and distortion of the pectoral and pelvic girdles and limbs. To characterize this allele, we designed a custom 4x180K microarray on the mouse X chromosome and performed comparative genomic hybridization using extracted DNA from normal and carrier Mo-dp females, and identified an approximately 9 kb deletion. We used PCR to fine-map the breakpoints and amplify a junction fragment of 630 bp. Sequencing of the junction fragment disclosed the exact breakpoint locations and that the Mo-dp deletion is precisely 8990 bp, including approximately 2 kb in the promoter region of Atp7a. Western blot analysis of Mo-dp heterozygous brains showed diminished amounts of Atp7a protein, consistent with reduced expression due to the promoter region deletion on one allele. In heterozygous females, brain copper levels tended to be lower compared to wild type whereas neurochemical analyses revealed higher dihydroxyphenylacetic acid:dihydroxyphenylglycol (DOPAC:DHPG) and dopamine:norepinephrine (DA:NE) ratios compared to normal (P=0.002 and 0.029, respectively), consistent with partial deficiency of dopamine-beta-hydroxylase, a copper-dependent enzyme. Heterozygous females showed no significant differences in body weight compared to wild type females. Our results delineate the molecular details of the Mo-dp mutation for the first time and define novel biochemical findings in heterozygous female carriers of this allele.


Assuntos
Adenosina Trifosfatases/genética , Proteínas de Transporte de Cátions/genética , Modelos Animais de Doenças , Síndrome dos Cabelos Torcidos/genética , Alelos , Animais , Western Blotting , Peso Corporal , Encéfalo/metabolismo , Hibridização Genômica Comparativa , Cobre/metabolismo , ATPases Transportadoras de Cobre , Dopamina beta-Hidroxilase/metabolismo , Feminino , Heterozigoto , Humanos , Síndrome dos Cabelos Torcidos/metabolismo , Camundongos , Análise de Sequência com Séries de Oligonucleotídeos , Fenótipo , Reação em Cadeia da Polimerase , Análise de Sequência de DNA , Deleção de Sequência , Cromossomo X/genética
11.
Annu Rev Nurs Res ; 32: 63-78, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25222538

RESUMO

The continued evolution of military munitions and armor on the battlefield, as well as the insurgent use of improvised explosive devices, has led to embedded fragment wounds containing metal and metal mixtures whose long-term toxicologic and carcinogenic properties are not as yet known. Advances in medical care have greatly increased the survival from these types of injuries. Standard surgical guidelines suggest leaving embedded fragments in place, thus individuals may carry these retained metal fragments for the rest of their lives. Nursing professionals will be at the forefront in caring for these wounded individuals, both immediately after the trauma and during the healing and rehabilitation process. Therefore, an understanding of the potential health effects of embedded metal fragment wounds is essential. This review will explore the history of embedded fragment wounds, current research in the field, and Department of Defense and Department of Veterans Affairs guidelines for the identification and long-term monitoring of individuals with embedded fragments.


Assuntos
Corpos Estranhos/diagnóstico , Corpos Estranhos/enfermagem , Metais , Enfermagem Militar/normas , Guias de Prática Clínica como Assunto , Ferimentos por Arma de Fogo/diagnóstico , Ferimentos por Arma de Fogo/enfermagem , Humanos , Militares , Estados Unidos , United States Department of Defense , United States Department of Veterans Affairs
12.
Int J Environ Res Public Health ; 11(2): 1261-78, 2014 Jan 23.
Artigo em Inglês | MEDLINE | ID: mdl-24464236

RESUMO

BACKGROUND: The majority of modern war wounds are characterized by high-energy blast injuries containing a wide range of retained foreign materials of a metallic or composite nature. Health effects of retained fragments range from local or systemic toxicities to foreign body reactions or malignancies, and dependent on the chemical composition and corrosiveness of the fragments in vivo. Information obtained by chemical analysis of excised fragments can be used to guide clinical decisions regarding the need for fragment removal, to develop therapeutic interventions, and to better anticipate future medical problems from retained fragment related injuries. In response to this need, a new U.S Department of Defense (DoD) directive has been issued requiring characterization of all removed fragments to provide a database of fragment types occurring in combat injuries. OBJECTIVES: The objective of this study is to determine the chemical composition of retained embedded fragments removed from injured military personnel, and to relate results to histological findings in tissue adjacent to fragment material. METHODS: We describe an approach for the chemical analysis and characterization of retained fragments and adjacent tissues, and include case examples describing fragments containing depleted uranium (DU), tungsten (W), lead (Pb), and non-metal foreign bodies composed of natural and composite materials. Fragments obtained from four patients with penetrating blast wounds to the limbs were studied employing a wide range of chemical and microscopy techniques. Available adjacent tissues from three of the cases were histologically, microscopically, and chemically examined. The physical and compositional properties of the removed foreign material surfaces were examined with energy dispersive x-ray fluorescence spectrometry (EDXRF), scanning electron microscopy (SEM), laser ablation inductively-coupled plasma mass-spectrometry (LA-ICP-MS), and confocal laser Raman microspectroscopy (CLRM). Quantitative chemical analysis of both fragments and available tissues was conducted employing ICP-MS. RESULTS: Over 800 fragments have been characterized and included as part of the Joint Pathology Center Embedded Fragment Registry. Most fragments were obtained from penetrating wounds sustained to the extremities, particularly soft tissue injuries. The majority of the fragments were primarily composed of a single metal such as iron, copper, or aluminum with traces of antimony, titanium, uranium, and lead. One case demonstrated tungsten in both the fragment and the connected tissue, together with lead. Capsular tissue and fragments from a case from the 1991 Kuwait conflict showed evidence of uranium that was further characterized by uranium isotopic ratios analysis to contain depleted uranium. CONCLUSIONS: The present study provides a systematic approach for obtaining a full chemical characterization of retained embedded fragments. Given the vast number of combat casualties with retained fragments, it is expected that fragment analysis will have significant implications for the optimal short and long-term care of wounded service members.


Assuntos
Corpos Estranhos/patologia , Militares , Sistema de Registros , Urânio/análise , Ferimentos Penetrantes/patologia , Adulto , Humanos , Chumbo/análise , Masculino , Tungstênio/análise , Adulto Jovem
13.
Inhal Toxicol ; 25(7): 405-16, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23796017

RESUMO

The health consequences of sand particle inhalation are incompletely understood. This project evaluated the respiratory toxicity of sand particles collected at military bases near Fort Irwin USA, in Iraq (Camp Victory, Taji and Talil), and Khost Afghanistan. Our primary focus was on assessing the role of soluble metals in the respiratory toxicity of the sand particles using in vitro and in vivo methods. Replicating rat type II alveolar cell cultures (RLE-6TN) were exposed to sand extracts or vehicle control in serum-free media for ≤24 h. Cytotoxicity was determined using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay and assessment of lactate dehydrogenase leakage. The relative in vitro cytotoxicity of the sand extracts was Taji ≈ Talil > Afghanistan > Camp Victory ≈ Fort Irwin. We also assessed extracts of Camp Victory, Afghanistan, and Taji sand for acute and delayed pulmonary toxicity in rats following intratracheal administration. Assessments included biochemical analysis of bronchoalveolar lavage fluid (BALF) and lung histopathology. The in vitro cytotoxicity assay results were partially predictive of in vivo responses. The more cytotoxic Taji sand extract induced an acute irritant response in rats following intratracheal administration. Rats given the less cytotoxic Camp Victory sand extract had minimal biochemical or cytological BALF changes whereas rats given either the Afghanistan or Taji sand extracts demonstrated BALF changes that were suggestive of mild lung inflammation. Unexpectedly, we observed similar lung pathology in all extract-exposed rats. The results of our study can be used to prioritize future particle inhalation studies or guide epidemiological study design.


Assuntos
Poeira , Pulmão/efeitos dos fármacos , Dióxido de Silício/toxicidade , Administração por Inalação , Afeganistão , Animais , Arsênio/análise , Arsênio/toxicidade , Líquido da Lavagem Broncoalveolar/química , Líquido da Lavagem Broncoalveolar/citologia , Contagem de Células , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Citocinas/metabolismo , Poeira/análise , Endotoxinas/análise , Endotoxinas/toxicidade , Geografia , Iraque , L-Lactato Desidrogenase/metabolismo , Pulmão/metabolismo , Pulmão/patologia , Masculino , Metais/análise , Metais/toxicidade , Ratos , Dióxido de Silício/análise , Estados Unidos
14.
Health Phys ; 104(4): 347-61, 2013 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23439138

RESUMO

During the 1991 GulfWar, U.S. service members were exposed to depleted uranium (DU) through friendly-fire incidents involving DU munitions and vehicles protected by DU armor. Routes of exposure to DU involved inhalation of soluble and insoluble DU oxide particles, wound contamination, and retained embedded DU metal fragments that continue to oxidize in situ and release DU to the systemic circulation. A biennial health surveillance program established for this group of Veterans by the U.S. Department of Veterans Affairs has shown continuously elevated urine DU concentrations in the subset of veterans with embedded fragments for over 20 years. While the 2011 assessment was comprehensive, few clinically significant U-related health effects were observed. This report is focused on health outcomes associated with two primary target organs of concern for long term effects of this combat-related exposure to DU. Renal biomarkers showed minimal DU-related effects on proximal tubule function and cytotoxicity, but significant biomarker results were observed when urine concentrations of multiple metals also found in fragments were examined together. Pulmonary tests and questionnaire results indicate that pulmonary function after 20 y remains within the clinical normal range. Imaging of DU embedded fragment-associated tissue for signs of inflammatory or proliferative reactions possibly associated with foreign body transformation or with local alpha emissions from DU was also conducted using PET-CT and ultrasound. These imaging tools may be helpful in guiding decisions regarding removal of fragments.


Assuntos
Biomarcadores/urina , Guerra do Golfo , Metais/urina , Exposição Ocupacional/efeitos adversos , Urânio/toxicidade , Estudos de Coortes , Diagnóstico por Imagem , Humanos , Sistema Imunitário , Testes de Função Renal , Masculino , Pessoa de Meia-Idade , Testes de Função Respiratória , Urânio/urina , Veteranos
15.
J Trace Elem Med Biol ; 27(1): 2-6, 2013 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-22944582

RESUMO

In this study we report uranium analysis for human semen samples. Uranium quantification was performed by inductively coupled plasma mass spectrometry. No additives, such as chymotrypsin or bovine serum albumin, were used for semen liquefaction, as they showed significant uranium content. For method validation we spiked 2g aliquots of pooled control semen at three different levels of uranium: low at 5 pg/g, medium at 50 pg/g, and high at 1000 pg/g. The detection limit was determined to be 0.8 pg/g uranium in human semen. The data reproduced within 1.4-7% RSD and spike recoveries were 97-100%. The uranium level of the unspiked, pooled control semen was 2.9 pg/g of semen (n=10). In addition six semen samples from a cohort of Veterans exposed to depleted uranium (DU) in the 1991 Gulf War were analyzed with no knowledge of their exposure history. Uranium levels in the Veterans' semen samples ranged from undetectable (<0.8 pg/g) to 3350 pg/g. This wide concentration range for uranium in semen is consistent with known differences in current DU body burdens in these individuals, some of whom have retained embedded DU fragments.


Assuntos
Espectrometria de Massas/métodos , Sêmen/química , Urânio/análise , Humanos , Masculino
16.
Microchem J ; 105: 101-107, 2012 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-23175155

RESUMO

Arsenic (As) is a well documented human carcinogen. However, its mechanisms of toxic action and carcinogenic potential in animals have not been conclusive. In this research, we investigated the biochemical and genotoxic effects of As and studied its distribution in selected tissues of Sprague-Dawley rats. Four groups of six male rats, each weighing approximately 60 ± 2 g, were injected intraperitoneally, once a day for 5 days with doses of 5, 10, 15, 20 mg/kg bw of arsenic trioxide. A control group was also made of 6 animals injected with distilled water. Following anaesthetization, blood was collected and enzyme analysis was performed by spectrophotometry following standard protocols. At the end of experimentation, the animals were sacrificed, and the lung, liver, brain and kidney were collected 24 h after the fifth day treatment. Chromosome and micronuclei preparation was obtained from bone marrow cells. Arsenic exposure significantly increased (p<0.05) the activities of plasma alanine aminotransferase-glutamate pyruvate transaminase (ALT/GPT), and aspartate aminotransferase-glutamate oxaloacetate transaminase (AST/GOT), as well as the number of structural chromosomal aberrations (SCA) and frequency of micronuclei (MN) in the bone marrow cells. In contrast, the mitotic index in these cells was significantly reduced (p<0.05). These findings indicate that aminotransferases are candidate biomarkers for arsenic-induced hepatotoxicity. Our results also demonstrate that As has a strong genotoxic potential, as measured by the bone marrow SCA and MN tests in Sprague-Dawley rats. Total arsenic concentrations in tissues were measured by inductively coupled plasma mass spectrometry (ICP-MS). A dynamic reaction cell (DRC) with hydrogen gas was used to eliminate the ArCl interference at mass 75, in the measurement of total As. Total As doses in tissues tended to correlate with specific exposure levels.

17.
Mol Genet Metab ; 107(1-2): 222-8, 2012 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-22695177

RESUMO

Menkes disease is a lethal X-linked recessive neurodegenerative disorder of copper transport caused by mutations in ATP7A, which encodes a copper-transporting ATPase. Early postnatal treatment with copper injections often improves clinical outcomes in affected infants. While Menkes disease newborns appear normal neurologically, analyses of fetal tissues including placenta indicate abnormal copper distribution and suggest a prenatal onset of the metal transport defect. In an affected fetus whose parents found termination unacceptable and who understood the associated risks, we began in utero copper histidine treatment at 31.5 weeks gestational age. Copper histidine (900 µg per dose) was administered directly to the fetus by intramuscular injection (fetal quadriceps or gluteus) under ultrasound guidance. Percutaneous umbilical blood sampling enabled serial measurement of fetal copper and ceruloplasmin levels that were used to guide therapy over a four-week period. Fetal copper levels rose from 17 µg/dL prior to treatment to 45 µg/dL, and ceruloplasmin levels from 39 mg/L to 122 mg/L. After pulmonary maturity was confirmed biochemically, the baby was delivered at 35.5 weeks and daily copper histidine therapy (250 µg sc b.i.d.) was begun. Despite this very early intervention with copper, the infant showed hypotonia, developmental delay, and electroencephalographic abnormalities and died of respiratory failure at 5.5 months of age. The patient's ATP7A mutation (Q724H), which severely disrupted mRNA splicing, resulted in complete absence of ATP7A protein on Western blots. These investigations suggest that prenatally initiated copper replacement is inadequate to correct Menkes disease caused by severe loss-of-function mutations, and that postnatal ATP7A gene addition represents a rational approach in such circumstances.


Assuntos
Adenosina Trifosfatases/genética , Proteínas de Transporte de Cátions/genética , Feto/efeitos dos fármacos , Histidina/análogos & derivados , Síndrome dos Cabelos Torcidos/tratamento farmacológico , Síndrome dos Cabelos Torcidos/genética , Mutação , Compostos Organometálicos/uso terapêutico , Catecóis/sangue , Ceruloplasmina/metabolismo , Cobre/sangue , ATPases Transportadoras de Cobre , Feminino , Morte Fetal/patologia , Histidina/administração & dosagem , Histidina/uso terapêutico , Humanos , Compostos Organometálicos/administração & dosagem , Placenta/metabolismo , Placenta/patologia , Gravidez , Natimorto
18.
J Occup Environ Med ; 54(6): 724-32, 2012 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22544161

RESUMO

OBJECTIVE: To ensure that all veterans with retained embedded fragments are properly monitored for potential health effects of embedded materials. METHODS: Urine biomonitoring and health surveillance programs were developed to gather information about health risks associated with chemicals released from embedded fragments. RESULTS: Elevated systemic exposure to depleted uranium (DU) that continues to occur in veterans with DU fragments remains a concern, although no clinically significant DU-related health effects have been observed to date. Other metals and local tissue reactions to embedded fragments are also of concern. CONCLUSIONS: Knowledge gained from these programs will help to develop guidelines for surgical removal of tissue-embedded fragments.


Assuntos
Inquéritos Epidemiológicos/estatística & dados numéricos , Doenças Profissionais/epidemiologia , Exposição Ocupacional , Vigilância da População/métodos , Urânio/toxicidade , Urânio/urina , Veteranos/estatística & dados numéricos , Adulto , Campanha Afegã de 2001- , Estudos de Coortes , Feminino , Substâncias Perigosas/toxicidade , Substâncias Perigosas/urina , Humanos , Guerra do Iraque 2003-2011 , Masculino , Pessoa de Meia-Idade , Doenças Profissionais/urina , Tempo , Ferimentos por Arma de Fogo/epidemiologia , Ferimentos por Arma de Fogo/urina
19.
Environ Geochem Health ; 34(5): 563-74, 2012 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22580621

RESUMO

Drinking of arsenic (As)-contaminated groundwater has adverse effects on health of millions of people worldwide. This study aimed to determine the degree of severity of As exposure from drinking water in peri-urban Moyna and Ardebok villages, West Bengal, India. Arsenic concentrations in hair, nail and urine samp les of the individuals were determined. Arsenical dermatosis, keratosis and melanosis were investigated through medical evaluation. We have evaluated the association between As exposure from drinking water, and keratosis and melanosis outcomes. The results showed that 82.7 % of the sampled tube wells contain As concentrations above 10 µg/L, while 57.7 % contain As concentrations above 50 µg/L. The hair, nail and urine As concentrations were positively correlated with As concentrations in drinking water. In our study population, we observed a strong association between As concentrations ranging 51-99 µg/L and keratosis and melanosis outcomes, although the probability decreases at higher concentration ranges perhaps due to switching away from the use of As-contaminated tube wells for drinking and cooking purposes. High As concentrations in hair, nail and urine were observed to be associated with the age of the study population. The level of As concentrations in hair, nail and urine samples of the study population indicated the degree of severity of As exposure in the study region.


Assuntos
Arsênio/toxicidade , Exposição Ambiental , Água Subterrânea/análise , Ceratose/induzido quimicamente , Melanose/induzido quimicamente , Dermatopatias/induzido quimicamente , Poluentes Químicos da Água/toxicidade , Adolescente , Adulto , Arsênio/análise , Arsênio/urina , Água Potável/análise , Monitoramento Ambiental , Feminino , Fluorescência , Cabelo/química , Humanos , Índia/epidemiologia , Ceratose/epidemiologia , Masculino , Melanose/epidemiologia , Pessoa de Meia-Idade , Unhas/química , Dermatopatias/epidemiologia , Poluentes Químicos da Água/análise , Poluentes Químicos da Água/urina
20.
Inhal Toxicol ; 24(2): 109-24, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22283445

RESUMO

Respiratory symptoms are frequently reported in personnel deployed to the Middle East. This project characterized the respiratory toxicity of inhaled Iraqi sand (IS). Adult rats underwent a 6-wk inhalation to air or mainstream cigarette smoke (MSCS) (3 h/d, 5 d/wk) that included exposure to IS or crystalline silica (1 mg/m(3), 19 h/d, 7 d/wk) or air during the last 2 weeks. Assessments included motor activity, whole-body plethysmography, cytological and biochemical analysis of bronchoalveolar lavage fluid, lung metal burden, nasal and lung pathology, and changes in lung protein and gene expression. A number of metals including nickel, manganese, vanadium, and chromium were detected in IS. Elevated lung parenchyma aluminum, silica, barium, manganese, and vanadium concentrations were seen in IS-exposed rats, suggesting that several metals present in IS are bioavailable. Rats exposed to IS only developed mild inflammation in the anterior nose and lung. Silica inhalation was associated with some pulmonary responses that were not seen in IS-exposed rats, such as mild laryngeal and tracheal inflammation, mild tracheal epithelial hyperplasia, and elevated lung silica concentrations. MSCS inhalation with or without co-exposure to either IS or silica resulted in changes consistent with pulmonary inflammation and stress response. Rats exposed to MSCS and silica had more widespread airway lesions when compared with rats exposed to MSCS only. Silica-exposed rats had more robust pulmonary gene expression and proteomic responses than that seen in IS-exposed rat. Our studies show that the respiratory toxicity of IS is qualitatively similar to or less than that seen following short-term silica exposure.


Assuntos
Poluentes Atmosféricos/toxicidade , Poeira , Metais/toxicidade , Dióxido de Silício/toxicidade , Poluição por Fumaça de Tabaco/efeitos adversos , Administração por Inalação , Animais , Comportamento Animal/efeitos dos fármacos , Testes de Provocação Brônquica , Líquido da Lavagem Broncoalveolar/química , Líquido da Lavagem Broncoalveolar/citologia , Poeira/análise , Expressão Gênica/efeitos dos fármacos , Força da Mão , Iraque , Laringe/efeitos dos fármacos , Laringe/patologia , Pulmão/efeitos dos fármacos , Pulmão/patologia , Pulmão/fisiologia , Masculino , Metais/análise , Atividade Motora/efeitos dos fármacos , Análise de Sequência com Séries de Oligonucleotídeos , Ratos , Ratos Sprague-Dawley , Testes de Função Respiratória , Mucosa Respiratória/efeitos dos fármacos , Mucosa Respiratória/patologia , Dióxido de Silício/análise , Traqueia/efeitos dos fármacos , Traqueia/patologia
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