Susceptibility to oxidative stress, insulin resistance, and insulin secretory response in the development of diabetes from obesity

Background/Aim. Oxidative stress plays a critical role in the pathogenesis of various diseases. Recent reports indicate that obesity may induce systemic oxidative stress. The aim of the study was to potentiate oxidative stress as a factor which may aggravate peripheral insulin sensitivity and insulinsecretory response in obesity in this way to potentiate development of diabetes. The aim of the study was also to establish whether insulin-secretory response after glucagonstimulated insulin secretion is susceptible to prooxidant/ antioxidant homeostasis status, as well as to determine the extent of these changes. Methods. A mathematical model of glucose/insulin interactions and C-peptide was used to indicate the degree of insulin resistance and to assess their possible relationship with altered antioxidant/prooxidant homeostasis. The study included 24 obese healthy and 16 obese newly diagnozed non-insulin dependent diabetic patients (NIDDM) as well as 20 control healthy subjects, matched in age. Results. Total plasma antioxidative capacity, erythrocyte and plasma reduced glutathione level were significantly decreased in obese diabetic patients, but also in obese healthy subjects, compared to the values in controls. The plasma lipid peroxidation products and protein carbonyl groups were significantly higher in obese diabetics, more than in obese healthy subjects, compared to the control healthy subjects. The increase of erythrocyte lipid peroxidation at basal state was shown to be more pronounced in obese daibetics, but the apparent difference was obtained in both the obese healthy subjects and obese diabetics, compared to the control values, after exposing of erythrocytes to oxidative stress induced by H2O2. Positive correlation was found between the malondialdehyde (MDA) level and index of insulin sensitivity (FIRI). Conclusion. Increased oxidative stress together with the decreased antioxidative defence seems to contribute to decreased insulin sensitivity and impaired insulin secretory response in obese diabetics, and may be hypothesized to favour the development of diabetes during obesity

NUTRITION AND PATIENTS WITH HIV/AIDS

Immune status of an individual depends on the organism’s nutritional status as well as on the choice of nutrients that enter the body. Malnutrition and HIV progression are closely linked and require an active cooperation between infectious disease physicians and nutritionist. It has been noticed that patients with HIV that receive antiretroviral therapy have a significantly greater loss of body weight, and therefore need an adequate diet modification. Oxidative stress represents an important etiological factor in diseases of immune deficiency, so that antioxidant agents (Vitamin A, Vitamin E, Vitamin B12 and certain minerals, such as zinc and selenium) are crucial factors in HIV dietotherapy. Polyphenols from cocoa beans as well as from green and black tea (catechins and teaflavins) have an important role in disease progress modification as well as disease transmission prevention. The patients also need their probiotic intestinal flora to be encouraged to grow properly in order to prevent opportunistic infections. All of these nutrition elements are already in use in prevention, therapy and alleviation of HIV symptoms, and further science development will make a personal diet modification for each patient possible

Effect of spice extracts on the growth of penicillium species

The inhibitory effect of various concentrations (0, 0.1, 0.5, I and 2%) of caraway, garlic and oregano extracts on growth of four species of PeniciUium were investigated. Among the spices used, caraway showed the strongest effect on all moulds. It completely inhibited growth of P. aurantiogriseum at the level of 0.5% extract and P. commune. P. griseofulvum and P. corylophilum at the level of 1%. The garlic extract completely inhibited the growth only of P. aurantiogriseum, but was ineffective against P. commune and P. griseofulvum. Oregano showed partial effect in inhibition of all four species, with significant growth reduction at concentration of 2%

Malondialdehid kao nezavisan prediktor indeksa telesne mase kod adolescentkinja

Background: Given the fact that the studies that examined oxidative stress in relation to obesity that included late adolescents are scarce and show inconclusive results we aimed to investigate a wide spectrum of nitro-oxidative stress biomarkers i.e., malondialdehyde (MDA), xanthine oxidase (XO), xanthine oxidoreductase (XOD), xanthine dehydrogenase (XDH), advanced oxidation protein products (AOPP) and nitric oxide products (NOx), as well as an antioxidative enzyme, i.e., catalase (CAT) in relation with obesity in the cohort of adolescent girls ages between 16 and 19 years old. Methods: A total of 59 teenage girls were included in this cross-sectional study. Binary logistic regression analysis was performed to examine possible associations between bio- chemical and nitro-oxidative stress markers and body mass index (BMI). Results: There were not significant differences between oxidative stress markers between normal weight and overweight/obese girls (i.e., AOPP, XOD, XO, XDH) and CAT, except for MDA (p<0.001) and NOx (p=0.010) concentrations which were significantly higher in overweight/obese adolescent girls. Positive associations were evident between BMI and high sensitivity C-reactive protein (hsCRP) (OR=2.495), BMI and uric acid (OR=1.024) and BMI and MDA (OR=1.062). Multivariable binary regression analysis demonstrated sig- nificant independent associations of BMI and hsCRP (OR=2.150) and BMI and MDA (OR=1.105). Even 76.3% of the variation in BMI could be explained with this Model. Conclusions: Inflammation (as measured with hsCRP) and oxidative stress (as determined with MDA) independently correlated with BMI in teenage girls.Uvod: Imajući u vidu činjenicu da je malo studija koje su ispitivale povezanost oksidativnog stresa i gojaznosti kod adolescenata i da iste pokazuju oprečne rezultate, cilj istraživanja je bio da se ispita povezanost širokog spektra biomarkera nitro-oksidativnog stresa tj. malondialdehida (MDA), ksantin oksidaze (XO), ksantin oksidoreduktaze (XOD), ksantin dehidrogenaze (XDH), produkata uznapredovale oksidacije proteina (AOPP) i produkata azot-monoksida (NOx), kao i enzima antioksidativne zaštite, tj. katalaze (CAT) i gojaznosti u kohorti adolescentkinja starosne dobi izme|u 16 i 19 godina. Metode: Ukupno 59 tinejdžerki je uključeno u ovu studiju preseka. Binarna logistička regresija je primenjena u cilju ispitivanja potencijalne povezanosti između biohemijskih markera i markera nitro-oksidativnog stresa i indeksa telesne mase (ITM). Rezultati: Nije uočena razlika u biomarkerima oksidativnog stresa između normalno uhranjenih i predgojaznih/gojaznih adolescentkinja (odnosno AOPP, XOD, XO, XDH) i CAT, osim u vrednostima MDA (p<0,001) i NOx (p=0,010) koje su bile značajno veće kod predgojaznih/gojaznih adolescentkinja. Pozitivna korelacija je utvrđena izme|u ITM-a i visokosenzitivnog C-reaktivnog proteina (hsCRP) (OR=2,495), ITM-a i mokraćne kiseline (OR=1,024) i ITM-a i MDA (OR=1,062). Multivarijanta binarna regresija je pokazala nezavisnu povezanost ITM-a i hsCRP (OR=2,150), kao i ITM-a i MDA (OR=1,105). Čak 76,3% varijabiliteta ITM-a može biti objašnjeno ovim modelom. Zaključak: Inflamacija (merena hsCRP-om) i oksidativni stres (meren malondialdehidom) nezavisno koreliraju sa ITM kod adolescentkinja

High-density cervical ureaplasma urealyticum colonization in pregnant women

Background/aim: Ureaplasma urealyticum, a common commensal of the female lower genital tract, has been observed as an important opportunistic pathogen during pregnancy. The aims of this study were to determine the degree of cervical colonization with U. urealyticum in pregnant women with risk pregnancy and in pregnant women with normal term delivery and to evaluate the correlation between high-density cervical U. urealyticum colonization and premature rupture of membranes (PROM) as well. Methods. This research was conducted on the samples comprising 130 hospitalized pregnant women with threatening preterm delivery and premature rupture of membranes. The control group consisted of 39 pregnant women with term delivery without PROM. In addition to standard bacteriological examination and performing direct immunofluorescence test to detect Chlamydia trachomatis, cervical swabs were also examined for the presence of U. urealyticum and Mycoplasma hominis by commercially available Mycofast Evolution 2 test (International Microbio, France). Results. The number of findings with isolated high-density U. urealyticum in the target group was 69 (53.08%), while in the control group was 14 (35.90%). Premature rupture of membranes (PROM) occurred in 43 (33.08%) examinees: 29 were pPROM, and 14 were PROM. The finding of U.urealyticum ≥104 was determined in 25 (58.14%) pregnant women with rupture, 17 were pPROM, and 8 were PROM. There was statistically significant difference in the finding of high-density U. urealyticum between the pregnant women with PROM and the control group (χ² = 4.06, p &lt; 0.05). U. urealyticum was predominant bacterial species found in 62.79% of isolates in the PROM cases, while in 32.56% it was isolated alone. Among the 49 pregnant women with preterm delivery, pPROM occurred in 29 (59.18%) examinees, and in 70.83% of pregnant women with findings of high-density U. urealyticum pPROM was observed. Conclusion. Cervical colonization with U. urealyticum ≥ 104 is more frequent in pregnant women with risk pregnancy than in pregnant women with normal term delivery. High-density cervical U. urealyticum colonization should be observed as a possible etiological factor for PROM

Mesenchymal stem cell properties of dental pulp cells from deciduous teeth

In the present study we have isolated and identified mesenchymal stem cells (MSCs) from the exfoliated deciduous teeth dental pulp (DP-MSCs), as plastic-adherent, spindle-shaped cells with a high proliferative potential. Immunophenotype analyses revealed that DP-MSCs were positive for mesenchymal cell markers (CD90, CD44, CD105, STRO-1, vimentin and α-SMA), and negative for hematopoietic stem cell markers (CD11b, CD33, CD34, CD45, CD235a). DPMSCs were also capable of differentiating into adipogenic, chondrogenic, myogenic and osteogenic lineages, fulfilling the functional criterion for their characterization. These results demonstrate that DP-MSCs offer a valuable, readily accessible source to obtain and store adult stem cells for future use

EFFECTS OF CADMIUM, AN ENVIRONMENTAL AND OCCUPATIONAL POLLUTANT, ON LIPID PEROXIDATION IN RAT PANCREATIC TISSUE

Technological development, industrialization and economic development have improved living standards, but also increased toxic metal emissions in the living and working environment. The aim of this study is the monitoring of lipid peroxidation in case of acute intoxication by heavy metal cadmium and the protective role of α-lipoic acid. In this study, we used healthy albino Wistar female rats, two or three months old. Based on the results obtained in this study, we note that cadmium-induced intoxication increases the level of malondialdehyde (MDA) in the pancreatic tissue homogenate. MDA is a direct indication of lipid peroxidation. Alpha-lipoic acid suggests reduction and correction of the toxic effect of cadmium after its exposure.

Presence of Listeria species in fresh meats from retail markets in Serbia

Listeria spp. are Gram positive, short, non-sporing rods, microaerophilic. Of the six species currently recognized, Listeria monocytogenes is the most important as it causes a range of infections in humans and animals. The organism can be found in a wide variety of habitats including the soil, food processing environments and raw foods. The ability of the organism to grow at refrigeration temperatures is of major importance in food production. This study examines the presence of Listeria species in fresh meat. 29 samples (chicken, pork and beef) meat. This bacteria was found in 82.7% of analyzed samples; 7 L. innocua, 8 L. monocytogenes and 9 L. welshimeri (of all isolates). L. innocua prevailed in pork meat (40%), L. monocytogenes in chicken and pork meat (30%), and L. welshimeri in beef meat (44.4%)

Nitric oxide products are not associated with metabolic syndrome

Background: Nitric oxide (NO) is oxidative stress biomarker which is regarded as one of the key determinants of energy metabolism and vascular tone. Considering the controversial reports on the association between nitric oxide products (NOx) and metabolic syndrome (MetS), the aim of the current study was to examine that potential relationship. Additionally, we aimed to evaluate a broad spectrum of other oxidative stress biomarkers [i.e., malondialdehyde (MDA), advanced oxidation protein products (AOPP), xanthine oxidoreductase (XOD), xanthine oxidase (XO) xanthine dehydrogenase (XDH)] in relation with MetS. Methods: A total of 109 volunteers (46.8% of them with MetS) were included in this cross-sectional study. Biohemical and anthropometric parameters, as well as blood pressure, were obtained. The MetS was diagnosed according to the International Diabetes Federation criteria. Results: Multivariate logistic regression analysis showed that XOD (OR=1.011; 95% CI 1.002-1.019; p=0.016), XO (OR=1.014; 95% CI 1.003-1.026; p=0.016), MDA (OR=1.113; 95% CI 1.038-1.192; p=0.003) and AOPP (OR=1.022; 95% CI 1.005-1.039; p=0.012) were the independent predictors of MetS, whereas no association between NOx and MetS was found. As XOD rose for 1 U/L, XO for 1 U/L, MDA for 1 mu mol/L and AOPP for 1 T/L, probability for MetS rose for 1.1%, 1.4%, 11.3% and 2.2%, respectively. Adjusted R-2 for the Model was 0.531, which means that 53.1% of variation in MetS could be explained with this Model. Conclusions: Unlike XOD, MDA and AOPP, NOx is not associated with MetS

Supporting information for: "Deoxyribonuclease I Inhibitory Properties, Molecular Docking and Molecular Dynamics Simulations of 1-(Pyrrolidin-2-yl)propan-2-one Derivatives"

Experimental Section: 1.1. Chemicals. 1.2. Compounds. 1.3. Evaluation of deoxyribonuclease I inhibition. 1.4. In silico molecular and ADMET properties. 1.5. In silico PAINS and promiscuity assessment. 1.6. Molecular docking. 1.6.1. Ligand preparation. 1.6.2. Receptor preparation 1.6.3. Binding site selection 1.6.4. Docking protocol 1.7. Molecular dynamics simulation . Table S1. Summary of the top five inhibitor-binding sites in DNase I. Additional references.Supporting information for: Ilić, B. S., Gajić, M., Bondžić, B. P., Džambaski, z., Kocić, G.,& Šmelcerović, A. A. (2021). Deoxyribonuclease I Inhibitory Properties, Molecular Docking and Molecular Dynamics Simulations of 1-(Pyrrolidin-2-yl)propan-2-one Derivatives. Chemistry and Biodisversity, Wiley, 18(3), e2000996. [https://doi.org/10.1002/cbdv.202000996]Published version of the article: [https://cer.ihtm.bg.ac.rs/handle/123456789/4498]Animation of molecular dynamics simulations - Inhibitor 1/DNase I: [https://cer.ihtm.bg.ac.rs/handle/123456789/4500]Animation of molecular dynamics simulations - Inhibitor 2/DNase I: [https://cer.ihtm.bg.ac.rs/handle/123456789/4501