Publications by authors named "Juan M Vargas-Morales"

7 Publications

  • Page 1 of 1

A preliminary study on health impacts of Mexican mercury mining workers in a context of precarious employment.

J Trace Elem Med Biol 2022 Jan 6;71:126925. Epub 2022 Jan 6.

Coordination for the Innovation and Application of Science and Technology (CIACYT), Autonomous University of San Luis Potosi, San Luis Potosi, Mexico. Electronic address:

Mercury mining is one of the main sources of mercury (Hg) release into the environment, causing serious impacts on human health and the environment. Workers in these mines are employed informally and precariously and therefore lack labor rights such as social security. The objective of the study is to make visible the exposure to environmental contaminants and the health of workers in mercury mines. An environmental assessment was conducted to determine workers' exposure to contaminants; urine samples were obtained to measure exposure to mercury and arsenic, and blood samples were obtained for lead and cadmium. Clinical parameters were also evaluated. Concentrations of Hg, As and Pb were determined in soil, 279.4 mg/kg (24.4-788.5), 14.7 mg/kg (9.5-20.3) and 1.4 mg/kg (1-2.8), respectively. The exposure results for mercury were 551 μg/g creatinine, for arsenic 50 μg/L and for lead 4.7 μg/dL. Cd-B was not found. In addition, 17.6 % of the workers had diabetes and 17.6 % had renal disorders. Principal Component Regression was performed obtaining an r of 0.86 for glomerular filtration rate and 0.54 for albumin creatinine ratio using clinical, occupational, and metal exposure variables. Exposure to Hg in this type of mine is not exclusive, so there is a cumulative risk of chronic exposure to different environmental pollutants directly impacting the health of workers. It is necessary to implement health strategies and different work opportunities for these workers.
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http://dx.doi.org/10.1016/j.jtemb.2022.126925DOI Listing
January 2022

Association of BCAT2 and BCKDH polymorphisms with clinical, anthropometric and biochemical parameters in young adults.

Nutr Metab Cardiovasc Dis 2021 10 24;31(11):3210-3218. Epub 2021 Jul 24.

Departamento de Fisiología de la Nutrición, Mexico. Electronic address:

Background And Aim: Circulating amino acids are modified by sex, body mass index (BMI) and insulin resistance (IR). However, whether the presence of genetic variants in branched-chain amino acid (BCAA) catabolic enzymes modifies circulating amino acids is still unknown. Thus, we determined the frequency of two genetic variants, one in the branched-chain aminotransferase 2 (BCAT2) gene (rs11548193), and one in the branched-chain ketoacid dehydrogenase (BCKDH) gene (rs45500792), and elucidated their impact on circulating amino acid levels together with clinical, anthropometric and biochemical parameters.

Methods And Results: We performed a cross-sectional comparative study in which we recruited 1612 young adults (749 women and 863 men) aged 19.7 ± 2.1 years and with a BMI of 24.9 ± 4.7 kg/m. Participants underwent clinical evaluation and provided blood samples for DNA extraction and biochemical analysis. The single nucleotide polymorphisms (SNPs) were determined by allelic discrimination using real-time polymerase chain reaction (PCR). The frequencies of the less common alleles were 15.2 % for BCAT2 and 9.83 % for BCKDH. The subjects with either the BCAT2 or BCKDH SNPs displayed no differences in the evaluated parameters compared with subjects homozygotes for the most common allele at each SNP. However, subjects with both SNPs had higher body weight, BMI, blood pressure, glucose, and circulating levels of aspartate, isoleucine, methionine, and proline than the subjects homozygotes for the most common allele (P < 0.05, One-way ANOVA).

Conclusion: Our findings suggest that the joint presence of both the BCAT2 rs11548193 and BCKDH rs45500792 SNPs induces metabolic alterations that are not observed in subjects without either SNP.
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http://dx.doi.org/10.1016/j.numecd.2021.07.011DOI Listing
October 2021

Bioremoval of Cobalt(II) from Aqueous Solution by Three Different and Resistant Fungal Biomasses.

Bioinorg Chem Appl 2019 17;2019:8757149. Epub 2019 Apr 17.

Unidad Académica Multidisciplinaria Zona Media, Universidad Autónoma de San Luis Potosí, Carretera San Ciro de Acosta Km. 4.0, Ejido Puente del Carmen, C.P. 79617 Río Verde, San Luis Potosí, Mexico.

The biosorption of Co(II) on three fungal biomasses: sp., sp., and , was studied in this work. The fungal biomass of sp. showed the best results, since it removes 93% at 24 h of incubation, while the biomasses of sp. and are less efficient, since they remove the metal 77.5% and 70%, respectively, in the same time of incubation, with an optimum pH of removal for the three analyzed biomasses of 5.0 ± 0.2 at 28°C. Regarding the temperature of incubation, the most efficient biomass was that of sp., since it removes 100%, at 50°C, while the biomasses of sp. and remove 97.1% and 94.1%, at the same temperature, in 24 hours of incubation. On the contrary, if the concentration of the metal is increased, the removal capacity for the three analyzed biomasses decreases; if the concentration of the bioadsorbent is increased, the removal of the metal also increases. It was observed that, after 4 and 7 days of incubation, 100%, 100%, and 96.4% of Co(II) present in naturally contaminated water were removed, respectively.
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http://dx.doi.org/10.1155/2019/8757149DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6501274PMC
April 2019

Expression of CD73 and A2A receptors in cells from subjects with obesity and type 2 diabetes mellitus.

Immunobiology 2015 Aug 26;220(8):976-84. Epub 2015 Feb 26.

Laboratory of Immunology and Cellular and Molecular Biology, Faculty of Chemical Sciences, UASLP, San Luis Potosí, S.L.P., Mexico. Electronic address:

Regulatory T cells have various mechanisms to suppress the inflammatory response, among these, the modulation of the microenvironment through adenosine and with the participation of CD39, CD73 and A2A. The aim of this study was to assess the expression of CD73 and A2A in immune cells and the effect of activation of A2A by an adenosine analogue on apoptosis in patients with obesity and type 2 diabetes mellitus (T2D). CD73 and A2A expression were analyzed by flow cytometry in lymphocyte subpopulations from patients with obesity (n = 22), T2D (n = 22), and healthy subjects (n = 20). Lymphocytes were treated with the selective A2A antagonist (ZM241385) or the selective A2A agonist (CGS21680), and apoptotic cells were detected by Annexin V. We found an increased expression of CD39 coupled to a decrease in CD73 in the patient groups with obesity and T2D compared to the control group in the different studied lymphocyte subpopulations. A2A expression was found to be increased in different subpopulations of lymphocytes from T2D patients. We also detected positive correlations between CD39+ cells and age and BMI. Meanwhile, CD73+ cells showed negative correlations with age, WHR, BMI, FPG, HbAc1, triglycerides and cholesterol. Moreover, an increase in the percentage of apoptotic cells from T2D patients with regard to the groups with obesity and control was observed. In addition, the CD8+ T cells of patients with T2D exhibited decreased apoptosis when treated with the A2A agonist. In conclusion, our data suggest a possible role for CD73 and A2A in inflammation observed in patients with T2D and obesity mediated via apoptosis.
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http://dx.doi.org/10.1016/j.imbio.2015.02.007DOI Listing
August 2015

[Causes of diabetic patients' indifference towards treatment, diet and monitoring and possible factors associated with such disease].

Rev Salud Publica (Bogota) 2013 May-Jun;15(3):478-85

Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, México,

Objectives: Analyze the causes of detachment to diet and treatment of patients with diabetes and factors associated with disease such as family history of diabetes and hypertension, in patients from one municipality of San Luis Potosi, Mexico, and surrounding areas.

Methods: Descriptive study of variables such as age, sex, schooling level, occupation, family history of diabetes and hypertension, causes of detachment to diet and treatment; analytic for groups in terms of the risk of diabetes according to socio demographic and family history.

Results: Of the 156 patients included main causes of detachment or abandonment of the indicated treatment and/or were the oblivion and insistence on restricted food intake. Patients with a family history of hypertension in both parents had 5.8 times the risk of Diabetes Mellitus, compared to those without this history (p<0.01). Those patients with a maternal history of diabetes had 4.76 times the risk of suffering it too, compared to those with only paternal history (p<0.001). For patients with a history of obesity, they had 2.4 times higher risk of developing diabetes than those who had not (p<0.05).

Conclusions: Main causes, reported by patients, for detachment to treatment and diet were the oblivion and the insistence on restricted food intake, and the degree of association of Diabetes Mellitus with family history of this disease and hypertension is 2.4 to 5.8 times, with p<0.05.
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November 2015

Atherogenic indices and prehypertension in obese and non-obese children.

Diab Vasc Dis Res 2013 Jan 21;10(1):17-24. Epub 2012 Mar 21.

Biomedical Research Unit, Mexican Social Security Institute, Predio Canoas 100, Siqueiros 225 esq./Castañeda, Col. Silvestre Dorador, 34067 Durango, Mexico.

We evaluate the relationship between different lipoproteins and atherogenic indices with pre-hypertension in 297 obese and 942 non-obese children with Tanner stage 1 enrolled in a multicentre, community-based cross-sectional study. Height, weight, fasting glucose and insulin levels, total cholesterol, triglycerides, high-density lipoprotein cholesterol (HDL-c), low-density lipoprotein cholesterol (LDL-c), non-HDL-c, LDL/HDL-c, triglycerides/cholesterol and total cholesterol/HDL-c ratios were measured. Mean age was 8.4 ± 1.2 years; pre-hypertension was identified in 104 (8.4%) participants, 46 (15.5%) obese and 58 (6.1%) non-obese children. The pre-hypertensive non-obese children show a high proportion of family history of hypertension (41.6 and 24.7%, p = 0.002) and elevation of insulin at a relatively low body mass index. The triglycerides:HDL-c ratio, but not other lipoproteins or atherogenic indices, was associated with pre-hypertension in obese (1.15, 95% confidence intervals 1.06-1.26) and non-obese children (1.38 95% confidence intervals 1.22-1.57). The triglycerides:HDL-c ratio is related to pre-hypertension in children; the family history of hypertension seems to be a risk factor in developing pre-hypertension.
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http://dx.doi.org/10.1177/1479164112440713DOI Listing
January 2013

Expression and function of P2X(7) receptor and CD39/Entpd1 in patients with type 2 diabetes and their association with biochemical parameters.

Cell Immunol 2011 13;269(2):135-43. Epub 2011 Apr 13.

Laboratorio de Inmunología y Biología Celular y Molecular, Facultad de Ciencias Químicas, UASLP, San Luis Potosí, SLP, Mexico.

Chronic inflammation is an important contributor to the insulin resistance observed in type 2 diabetes (T2D). We evaluated the expression and function of the P2X(7) receptor and CD39/Entpd1, molecules involved in the cellular regulation of inflammation, in peripheral blood mononuclear cells from T2D patients, and their correlation with the concentration of HbA1c in blood. T2D patients with deficient metabolic control (DC) showed increased proportion of P2X(7)(+) cells compared with healthy individuals; T2D-DC subjects also displayed higher proportion of CD14(+), CD4(+) and CD19(+) subpopulations of P2X(7)(+) cells when compared with T2D patients with acceptable metabolic control. A significant association was observed between the proportion of P2X(7)(+)CD14(+) cells and blood concentration of LDL-c. In addition, the percentages of CD39(+) cells and CD39(+)CD19(+) cells were significantly associated with HbA1c and fasting plasma glucose levels. No changes were observed in the function of P2X(7)(+) cells from T2D patients; however, enhanced CD39/Entpd1 enzyme activity and low serum levels of IL-17 were detected. Therefore, CD39(+) cells could have a balancing regulatory role in the inflammatory process observed in patients with T2D.
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http://dx.doi.org/10.1016/j.cellimm.2011.03.022DOI Listing
August 2011
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