Como funciona el adn yahoo dating

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como funciona el adn yahoo dating

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The aim of this cross-sectional study was to compare plasma homocysteine levels and polymorphism CT MTHFR with this score to determine the utility of these new biomarkers in clinical practice. Coronary heart disease risk augmented with an increase in the quartile of plasma homocysteine. The present study demonstrated an association between plasma homocysteine levels and the severity of coronary heart disease estimated with the Framingham coronary risk score, and this association appeared to be independent on the genotype of MTHFR.

We postulate that plasma homocysteine is effective enough, considered even in isolation. Numerous studies have identified hyperhomocysteinemia as an independent risk factor for coronary artery disease CAD.

Furthermore, influences of polymorphism of methylenetetrahydrofolate reductase MTHFR on homocysteine levels tHcy are documented. Nevertheless, in Argentina, there is little published work although CAD is extremely common. We performed a cross-sectional study on subjects 15 recruited in three health centers located in Buenos Aires city. The diagnosis of hypertension was ascertained on the basis of a long-term antihypertensive treatment.

The study group included subjects 59 males and females aged between 18 and 87 years. Smoking habits, history ofvascular disease, diabetes, and tHcy were significantly associated with T allele as hypertension risk factors. In fact, the differences observed on sex and age could be the result of endocrine activity, as hormonal status may modify the phenotypic expression of this genetic variant.

Betaine-homocysteine S-methyltransferase BHMT is an enzyme that converts homocysteine Hcy to methionine using betaine as a methyl donor. Betaine also acts as osmolyte in kidney medulla, protecting cells from high extracellular osmolarity.

Hepatic BHMT expression is regulated by salt intake. Hormones, particularly corticosteroids, also regulate BHMT expression in rat liver. We investigated to know whether the corticoadrenal activity plays a role in kidney BHMT expression. BHMT activity in rat kidneys is several orders of magnitude lower than in rat livers and only restricted to the renal cortex.

This study confirms that corticosteroids stimulate BHMT activity in the liver and, for the first time in an animal model, also up-regulate the BHMT gene expression. Besides, unlike the liver, corticosteroids in rat kidney down-regulate BHMT expression and activity.

Given that the classical effect of adrenocortical activity on the kidney is associated with sodium and water re-absorption by the distal tubule leading to volume expansion, by promoting lesser use of betaine as a methyl donor, corticosteroids would preserve betaine for its other role as osmoprotectant against changes in the extracellular osmotic conditions.

We conclude that corticosteroids are, at least in part, responsible for the inhibition of BHMT expression and activity in rat kidneys. Smoking habits, history of vascular disease, diabetes, and tHcy were significantly associated with T allele as hypertension risk factors. Homocysteine, a non-protein amino acid, important risk factor for atherosclerosis and thrombosis, causes dysfunction of vascular endothelial cells traduced in inadequate vasodilatation mechanism, is pro-inflammatory and induces endoplasmic reticulum stress.

The more reactive conformation is the homocysteine thiolactone HcyTproduct to the nonspecific action of methionyl-tRNA synthetase, which is incorporated into proteins by disulfide bonds S-homocysteinilation or amide bonds N-homocysteinilation affecting protein structure and function leading to cell toxicity, autoimmune responses and atherogenesis.

The enzyme paraoxonase-1 PON1part of high density lipoprotein HDLhad been studied only for its ability to hydrolyze organophosphate derivatives. But, more recently it has been attributed other important role. The enzyme activities are involving in protecting against the development of atherosclerosis, by preventing oxidation of lipoproteins and hydrolyze HcyT. There is growing evidence about the protective role of PON1 in vascular disease.

Genetic factors polymorphisms of the PON1environmental and lifestyle influence their concentration and biological activity, but drugs used as cardioprotectives and lipid-lowering or others, such as antibiotics and steroids, are also important modulators. This review is an updated of the most prominent information on clinical and experimental studies for understanding the role of the PON-1 in the protection against development of atherosclerosis.

Abstract The substitution of cytosine C by thymine T at nucleotide of the methylenetetrahydrofolate reductase MTHFR gene, which converts an alanine to a valine residue, is a frequent polymorphism with reduced specific activity, associated with moderate increase in plasma homocysteine levels tHcy and risk of vascular diseases.

This study was designed to investigate an association of this polymorphism with tHcy and vascular risk factors. We used a cross-sectional study on subjects affiliated to three health centers from Buenos Aires city.

The diagnosis of hypertension was ascertained by patients' clinical history. Only subjects under long-term antihypertensive treatment were included. Samples from physically active individuals 44 men and 94 women randomly selected were included. There was no significant difference regarding the risk of hypertension between NT and HT groups in the overall sample.

MTHFR CT mutation may contribute to hypertension or affect the development of hypertension through hyperhomocysteinemia. Antonio Prieto Gonzalez, mail elio. The test is also used to evaluate DNA damage related to chronic inflammation or preneoplastic and neoplastic conditions. The cells more frequently assessed in comet assay in humans are the peripheral blood lymphocytes, but there are other cell types that have been considered for that purpose.

Among those, buccal cells have received attention for its suitability for comet assay, but there have been relatively few studies on comet assay in buccal epithelial cells.

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However, there are technical difficulties related to comet assay in buccal epithelial cells that justifies the attempts to develop or optimize protocols that could contribute to standardize the test allowing more widespread use of buccal cells in biomonitoring or clinical trials.

In the present work, we compared three protocols: We introduced modifications in the protocols related to, a device utilized to scrape the cells from the mucosa, the place and volume of sample enzymatic digestion, trypsin concentration, and also, the times for lysis incubation and unwinding.

This modified protocol is a contribution to the optimization of comet assay for buccal cells and contributes to its utilization in biomonitoring human DNA damage. Repair kinetics during min showed a good correlation with clinical features in both XP patients. Journal of Medicine and Medical Science Vol. In addition, emphasis has been placed on the gradual variation in preventive paradigms, where identification of susceptible groups of population is of interest.

We have evaluated the differences in the repair of oxidative induced DNA damage between pre-menopausal breast tumors patients, and healthy women.

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Comet assay was chosen as a feasible technique to evaluate DNA repair. Results showed that basal DNA damage in patients was not higher than in controls. The amount of DNA repaired at minutes was Rate of DNA repair was determined in two zones of the curve: We conclude that comet assay is able to discriminate DNA repair efficiency between breast cancer patients and healthy women.

Coelomocyte biomarkers in the earthworm Eisenia fetida exposed to 2,4,6-trinitrotoluene TNT. Epub May Abstract Contamination by 2,4,6-trinitrotoluene TNT is a global environmental problem at sites of former explosive production, handling, or storage, and could have deleterious consequences for human and ecological health.

We investigated its sublethal effects to Eisenia fetida, using two nonspecific biomarkers. In coelomocytes of earthworms exposed 24, 48, or 72 h, we evaluated DNA damage comet assay and neutral red retention time NRRTusing the filter paper contact test. Along exposure time, two different patterns were observed. At the lower TNT concentrations 0. This decrease could be attributed to activation of the DNA repair system. At higher concentrations 1. Analysis of NRRT results showed a significant interaction between time and treatment.

After 48 h, a significant decrease was observed at 4. After 72 h, NRRT presented a concentration-dependent decrease, significantly different with respect to control at 0. The two assayed methods, performed on the same sample, showed clear responses to sublethal TNT exposure in E.

Serum malonyldialdehide levels, catalase and superoxide dismutase activity were also evaluated. Malonyldildehide decreased in all amifostine treatments with respect to cisplatin while antioxidant enzyme activities remained unchanged.

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However, DNA migration increased with the highest amifostine dose; in fact highest dose of amifostine did no protect damage caused by cisplatin this result have implications on amifostine treatment schedules in clinical practice.

Dra Alicia G Fuchs, mail Alicia. Epub Sep Abstract The taeniid tapeworm Echinococcus granulosus is the causative agent of echinococcal disease, a major zoonosis with worldwide distribution.

Several efforts to establish an in vitro model of E.

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In the present study, we have described and characterized a stable cell line obtained from E. Growth characterization, morphology by light, fluorescent and electronic microscopy, and karyotyping were carried out. Cell culture origin was confirmed by immunofluorescent detection of AgB4 antigen and by PCR for the mitochondrial cytochrome c-oxidase subunit 1 DCO1 gene. Cells seeded in agarose biphasic culture resembled a cystic structure, similar to the one formed in secondary hosts.

This cell line could be a useful tool to research equinococcal behavior, allowing additional physiological and pharmacological studies, such as the effect of growth factors, nutrients, and antiparasitic drugs on cell viability and growth and on cyst formation.

Journal of Helminthology vol. Abstract Bisphosphonates have been proposed as pharmacological agents against parasite and cancer cell growth. The effect of these compounds on helminthic cell viability and acellular compartment morphology, however, has not yet been studied.

Proline decreased calcium storage and increased colony formation. Changes in calcium storage may be associated with degenerative changes of the cysts, as shown in the in vitro colony model and linked to an adenosine triphosphate ATP decrease. In conclusion, bisphosphonates could be suitable tempering drugs to treat cestode infections. The addition of glycerol to the culture medium exacerbated the phenotype by blocking the endogenous generation and excretion of UQ9.

TbSPPS is inhibited by 1-[ n-octylamino ethyl] 1,1-bisphosphonic acid, and treatment with this compound was lethal for the cells.

Caso de Hidatidosiscistica causada por metacestodes larva de Echinococus granulosus. Diabetes is associated with metabolic and functional alterations in the gut. Male rats were divided into normal control, diabetic and insulin treated diabetic groups during 4 and 9 weeks. Sirius red staining showed marked increase in the extracellular matrix deposition in diabetic mucosa.

Ulcer size may be associated to slow healing. If this association is true, it could help with diagnosis and subsequent treatment of chronic venous ulcer CVU. The aim of this work was to study the relationship of ulcer size of CVU patients with the healing potential contained in their serum. These factors are responsible for revascularization, fibroblast proliferation and collagen deposition.

Further, the effect of serum on proliferation and collagen deposition was evaluated in vitro cultures. The results of the in vitro experiment highlighted the isolated effects of homolateral venous serum factors on Vero cells line not undergoing any inflammation.

Ulcer size did not influence the characteristics of sera from CVU patients. In the discussion our results are evaluated in the context of recent research regarding ulcer sizes.

como funciona el adn yahoo dating

The primary objective of this study was to estimate the prevalence of this disease in women of childbearing age and children treated at health centres in underserviced areas of the city of Buenos Aires.

Demographic and Chagas disease status data were collected. Samples for Chagas disease serology were obtained on filter paper and the reactive results were confirmed with conventional samples.

A total of 1, subjects were screened and 73 positive screening results were obtained: The Trypanosoma cruzi infection risk was greater in those individuals who had relatives with Chagas disease, who remember seeing kissing bugs, who were of Bolivian nationality or were born in the Argentine province of Santiago del Estero. The overall prevalence of Chagas disease was 4. Due to migration, Chagas disease is currently predominantly urban.

The observed prevalence requires health programme activities that are aimed at urban children and their mothers. Most children were infected congenitally, which reinforces the need for Chagas disease screening of all pregnant women and their babies in Argentina. The active search for new cases is important because the appropriate treatment in children has a high cure rate. Epub Nov Abstract Serum from asymptomatic or symptomatic with cardiovascular manifestations chagasic patients depleted of the complement system displayed an antiproliferative effect on Trypanosoma cruzi epimastigotes, RA strain, when added to the growth medium.

This effect was also observed when patient's serum was depleted of specific antibodies. The antiproliferative effect was both time and concentration dependent. It was confined to the non-dialyzable, high molecular weight, fraction of the serum. This effect was abrogated by allopurinol and catalase, and enhanced by N-ethylmaleimide.

Xanthine oxidoreductase and xanthine oxidase activities were increased in the chagasic sera, while catalase activity remained unchanged. Our data provides evidence to support the idea that the antiproliferative activity observed in sera from chagasic patients may be due, at least partially, to a direct effect of hydrogen peroxide on the epimastigotes of T. The increase of hydrogen peroxide to antiproliferative levels might result from an increase in xanthine oxidase activity in the serum of patients infected with the parasite.

Epub Nov 4. Abstract Hexachlorobenzene HCB is a lipophilic chemical compound that is widely distributed in the environment. HCB is known to cause liver tumors in experimental animals. In the present study the in vivo effect of HCB treatment on ornithine decarboxylase ODC and protein tyrosine kinase PTK activities, free polyamine content, and c-Myc, c-Fos, and c-Jun protein levels in rat liver were investigated.

The time-course of c-Myc, c-Fos, and c-Jun protein levels was different for each proto-oncogene. They were all elevated at the second day of treatment, while only c-Fos and c-Jun remained elevated after 10 days of HCB exposure.

These data jointly suggest that the increase in ODC activity may be the consequence of proto-oncogene induction. These results may be relevant to the early molecular events involved in HCB tumor promoter activity in rat liver. Mice were infected with Nicaragua T. We assessed survival rate, IgG levels, histopathological studies and quantified parasitaemia. Allopurinol administered immediately after benznidazole treatment was able to reduce parasitaemia and attenuate tissue damage by reducing inflammation.

The addition of allopurinol during the chronic phase showed the highest beneficial effect, not only by reducing parasitaemia but also by lowering the degree of inflammation and fibrosis. Biological characterization of a isolate from an endemic area and its susceptibility to conventional drugs Noelia L. Grosso, Jacqueline BuaAlina E. Bustos, Miriam Postan, Laura E.

Abstract We describe some biological and molecular characteristics of a Trypanosoma cruzi isolate derived from aTriatomine captured in Nicaragua. Nicaragua infected culture cells were treated with allopurinol, showing different behavior according to the cellular compartment, being cardiomyocyte primary cultures more resistant to this drug. The course of the infection in a mice experimental model and its susceptibility to benznidazole and allopurinol was analyzed.

In this work we show that T. Dr Jose Burdman mail: Epub Jan 9. Patients were evaluated clinically and by magnetic nuclear resonance to classify the adenoma according to their size. Hormonal concentrations in sera were determined by radioimmunoassay. Immunohistochemistry of the pituitary hormones was performed in the tumors. Tumors were obtained at surgery and immediately frozen in ice, transported to the laboratory and stored at degrees C.

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Reverse transcription was performed with purified RNA from the tumors. They were present in different histological specimens, the tumors were grades according to their size, and there was no relationship between the size of the tumor and the presence of T3 receptor RNAs.

The post-surgical evolution of the patient was mostly dependent on the size and not on the presence of T3 receptors. The presence of thyroid hormone receptors in pituitary tumors is in line with two important characteristics of these tumors: Epub Apr 9.