Synthesis, Structural Properties and Biological Activities of Novel Hydrazones of 2-, 3-, 4-Iodobenzoic Acid.

Nowadays, searching for novel antimicrobial agents is crucial due to the increasing number of resistant bacterial strains. Moreover, cancer therapy is a major challenge for modern medicine. Currently used cytostatics have a large number of side effects and insufficient therapeutic effects. Due to the above-mentioned facts, we undertook research to synthesize novel compounds from the acylhydrazone group aimed at obtaining potential antimicrobial and anticancer agents. As a starting material, we employed hydrazides of 2-, 3- or 4-iodobenzoic acid, which gave three series of acylhydrazones in the condensation reaction with various aldehydes. The chemical structure of all obtained compounds was confirmed by IR, 1H NMR, and 13C NMR. The structure of selected compounds was determined by single-crystal X-ray diffraction analysis. Additionally, all samples were characterized using powder X-ray diffraction. The other issue in this research was to examine the possibility of the solvent-free synthesis of compounds using mechanochemical methods. The biological screening results revealed that some of the newly synthesized compounds indicated a beneficial antimicrobial effect even against MRSA-the methicillin-resistant Staphylococcus aureus ATCC 43300 strain. In many cases, the antibacterial activity of synthesized acylhydrazones was equal to or better than that of commercially available antibacterial agents that were used as reference substances in this research. Significantly, the tested compounds do not show toxicity to normal cell lines either.

Antiproliferative Properties of Triterpenoids by ECIS Method-A New Promising Approach in Anticancer Studies?

Electric cell-substrate impedance sensing is an advanced in vitro impedance measuring system which uses alternating current to determine behavior of cells in physiological conditions. In this study, we used the abovementioned method for checking the anticancer activities of betulin and betulinic acid, which are some of the most commonly found triterpenes in nature. In our experiment, the threshold concentrations of betulin required to elicit antiproliferative effects, verified by MTT and LDH release methods, were 7.8 µM for breast cancer (T47D), 9.5 µM for lung carcinoma (A549), and 21.3 µM for normal epithelial cells (Vero). The ECIS results revealed the great potential of betulin and betulinic acid's antitumor properties and their maintenance of cytotoxic substances to the breast cancer T47D line. Moreover, both substances showed a negligible toxic effect on healthy epithelial cells (Vero). Our investigation showed that the ECIS method is a proper alternative to the currently used assay for testing in vitro anticancer activity of compounds, and that it should thus be introduced in cellular routine research. It is also a valuable tool for live-monitoring changes in the morphology and physiology of cells, which translates into the accurate development of anticancer therapies.

Evaluation of Antioxidative Mechanisms In Vitro and Triterpenes Composition of Extracts from Silver Birch (Betula pendula Roth) and Black Birch (Betula obscura Kotula) Barks by FT-IR and HPLC-PDA.

Silver birch, Betula pendula Roth, is one of the most common trees in Europe. Due to its content of many biologically active substances, it has long been used in medicine and cosmetics, unlike the rare black birch, Betula obscura Kotula. The aim of the study was therefore to compare the antioxidant properties of extracts from the inner and outer bark layers of both birch trees towards the L929 line treated with acetaldehyde. Based on the lactate dehydrogenase test and the MTT test, 10 and 25% concentrations of extracts were selected for the antioxidant evaluation. All extracts at tested concentrations reduced the production of hydrogen peroxide, superoxide anion radical, and 25% extract decreased malonic aldehyde formation in acetaldehyde-treated cells. The chemical composition of bark extracts was accessed by IR and HPLC-PDA methods and surprisingly, revealed a high content of betulin and lupeol in the inner bark extract of B. obscura. Furthermore, IR analysis revealed differences in the chemical composition of the outer bark between black and silver birch extracts, indicating that black birch may be a valuable source of numerous biologically active substances. Further experiments are required to evaluate their potential against neuroinflammation, cancer, viral infections, as well as their usefulness in cosmetology.

Intense remodeling of extracellular matrix within the varicose vein: the role of gelatinases and vascular endothelial growth factor.

BACKGROUND: Increased blood pressure in the varicose veins (VV) can contribute to the overexpression of matrix metalloproteinases (MMPs), affecting the endothelium, smooth muscle, and extracellular matrix of the vein wall. Gelatinases (MMP-2 and MMP-9), hypoxia, and inflammation occurring in the VV wall contribute to the increased expression of vascular endothelial growth factor (VEGF). AIMS: Our objective was to analyze the concentration of gelatinases and VEGF in the great saphenous VV wall and plasma of patients. METHODS: In total, 65 patients (2nd degree according to clinical state classification, etiology, anatomy, and pathophysiology-CEAP classification) aged 22 to 70 were enrolled. Control veins (n = 10) were collected from the patients who underwent coronary artery bypass graft surgery. Control plasma (n = 20) was obtained from healthy individuals. Gelatinases and VEGF levels were measured with the usage of ELISA method. RESULTS: A significant increase in MMP-9 (11.2 vs. 9.98 ng/mg of protein) and VEGF (41.06 vs. 26 ng/g of protein) concentration in VV wall compared with control veins was observed. A positive correlation between VEGF versus MMP-2 (p = 0.03, r = 0.27) was found in the VV wall. However, no correlation was found between the concentration of VEGF and MMP-9 (p = 0.4, r = 0.11) in the VV wall. In addition, no statistical differences between MMP-9, MMP-2, and VEGF levels in plasma of VV patients compared with controls were noticed. CONCLUSIONS: The results of the present study confirm that VV's patients have altered expression of MMPs and VEGF. Overexpression of MMP-9 and VEGF in the VV wall may contribute to the spreading of inflammatory process and suggests the intense remodeling of extracellular tissue within the VV wall.

Novel 3-Acetyl-2,5-disubstituted-1,3,4-oxadiazolines: Synthesis and Biological Activity.

The aim of our study was the two-stage synthesis of 1,3,4-oxadiazole derivatives. The first step was the synthesis of hydrazide-hydrazones from 3-methyl-4-nitrobenzhydrazide and the corresponding substituted aromatic aldehydes. Then, the synthesized hydrazide-hydrazones were cyclized with acetic anhydride to obtain new 3-acetyl-2,3-disubstituted-1,3,4-oxadiazolines. All of obtained compounds were tested in in vitro assays to establish their potential antimicrobial activity and cytotoxicity. Our results indicated that few of the newly synthesized compounds had some antimicrobial activity, mainly compounds 20 and 37 towards all used reference bacterial strains (except Klebsiella pneumoniae, Proteus mirabilis, and Pseudomonas aeruginosa) and fungi. These substances showed a strong or powerful bactericidal effect, especially against Staphylococcus spp. belonging to Gram-positive bacteria. Compound 37 was active against Staphylococcus epidermidis at minimal inhibitory concentration (MIC) = 0.48 µg/mL and was characterized by low cytotoxicity. This compound possessed quinolin-4-yl substituent in the second position of 1,3,4-oxadiazole ring and 3-methyl-4-nitrophenyl in position 5. High effectiveness and safety of these derivatives make them promising candidates as antimicrobial agents. Whereas the compound 20 with the 5-iodofurane substituent in position 2 of the 1,3,4-oxadiazole ring showed the greatest activity against S. epidermidis at MIC = 1.95 µg/mL.

Antioxidative mechanism in the course of varicose veins.

Objective Our objective was to evaluate the state of oxidative stress in the great saphenous varicose vein wall and blood of varicose vein patients taken from the antecubital vein. Methods The superoxide dismutase, reduced glutathione (GSH) and total antioxidant status were measured with commercially available colorimetric kits in erythrocytes, plasma and varicose vein wall of 65 patients (second degree of clinical state classification, etiology, anatomy and pathophysiology) aged 22-70 (49 women, 16 men) in comparison to normal great saphenous vein walls collected from 10 patients who underwent coronary artery bypass graft and blood collected from 20 healthy individuals. Results A statistically significant decrease (p < 0.001) in superoxide dismutase activity in erythrocytes and the increase (p < 0.05) in superoxide dismutase activity in varicose vein has been observed. There have been no significant changes in the concentration of GSH in plasma and in varicose vein. The decreased concentration of total antioxidant status in plasma (p < 0.001) and in varicose vein wall (p < 0.05) in comparison to the control has been noticed. Conclusion The varicose vein patients are affected by oxidative stress. Our results indicate impaired antioxidant defense mechanism in the blood of varicose vein patients. In contrast to the blood, an increased process of antioxidant defense in the varicose vein wall was noticed.

Adipokine Profile in Patients with Type 2 Diabetes Depends on Degree of Obesity.

BACKGROUND The fast pace of life, promoting fast food consumption and low physical activity, has resulted in obesity and/or diabetes as being serious social problems. The aim of the present study was to evaluate concentrations of selected adipokines (leptin, adiponectin, resistin, and visfatin) and to assess the leptin/adiponectin ratio in plasma of type 2 diabetes (T2D) patients in relation to degree of obesity. MATERIAL AND METHODS The study comprised 92 T2D subjects divided into 4 groups according to BMI value - I (normal body weight), II (overweight), III (obesity), and IV (severe obesity) - and 20 healthy volunteers (control group). Each group was divided into male and female subgroups. Plasma concentrations of adipokines were determined by enzyme-linked immunosorbent assay. RESULTS In women, leptin concentration was significantly higher in group IV, whereas in men it was higher in groups III and IV than in the control group and groups I and II. Irrespective of sex, a significant decrease in adiponectin level was observed in group III vs. CONTROL: There was no significant difference in resistin levels. In women visfatin was markedly enhanced in group III, whereas in men in groups II, III and IV vs. CONTROL: Leptin/adiponectin ratio was increased in groups III and IV vs. control in women, whereas in men vs. both control and group I. CONCLUSIONS The obese type 2 diabetic patients presented a disturbed adipokine profile, which seems to be an important link between obesity and T2D. The future studies concerning the question if regulating of adipokines' concentrations could be a promising approach for managing metabolic disorders seem to be well-grounded.

Novel synthesis scheme and in vitro antimicrobial evaluation of a panel of (E)-2-aryl-1-cyano-1-nitroethenes.

Drug resistance has become a major concern in the field of infection management, therefore searching for new antibacterial agents is getting more challenging. Our study presents an optimized and eco-friendly synthesis scheme for a panel of nitroalkenes bearing various functional groups in the aromatic moiety and bromine or cyano substituents in 1 position of nitrovinyl moiety. The presence of nitrolefine group outside the ring minimalizes genotoxic properties while conjugation of aryl group with nitrovinyl moiety increases stability of the compounds. Then our research focused on evaluation of biological properties of such obtained (E)-2-aryl-1-cyano-1-nitroethenes. As they exhibit strong bacteriostatic and bactericidal activities against reference bacteria and yeast species with no detectable cytotoxicity towards cultured human HepG2 and HaCaT cells, they could be promising candidates for the replacement of traditional nitrofurane-containing antibacterial drugs. Nevertheless, validation of the obtained data in an in vivo model and additional safety studies on mutagenicity are still required.

Characteristics of hematopoietic stem cells of umbilical cord blood.

Umbilical cord blood collected from the postpartum placenta and cord is a rich source of hematopoietic stem cells (HSCs) and is an alternative to bone marrow transplantation. In this review we wanted to describe the differences (in phenotype, cytokine production, quantity and quality of cells) between stem cells from umbilical cord blood, bone marrow and peripheral blood. HSCs present in cord blood are more primitive than their counterparts in bone marrow or peripheral blood, and have several advantages including high proliferation. With using proper cytokine combination, HSCs can be effectively developed into different cell lines. This process is used in medicine, especially in hematology.

Synthesis, antiproliferative and antimicrobial activity of new Mannich bases bearing 1,2,4-triazole moiety.

Abstract This study presents the synthesis, antiproliferative and antimicrobial evaluation of a new series of Mannich base derivatives containing 1,2,4-triazole system. New compounds were prepared by the reaction of 4,5-disubstituted 1,2,4-triazole-3-thiones with formaldehyde and various amines. The structures of the prepared compounds were confirmed by means of (1)H NMR, (13)C NMR and elemental analyses. Twelve compounds were evaluated for their in vitro antiproliferative activities against six chosen cancer cell lines. All synthesized compounds were screened for their in vitro antimicrobial activity by using the agar dilution technique. For 17 potentially active compounds, their antibacterial activity was confirmed on the basis of MIC (minimal inhibitory concentration) by broth microdilution method using the reference Gram-positive and Gram-negative bacterial strains.

Possible new organoselenium supplement--evaluation of its influence on the kidneys in comparison with inorganic sodium selenite.

The aim of this work was to evaluate the possibility of using of the new selenoorganic ring compound, 3-(o-chlorobenzoylamino)-2-(o-tolylimino)-4-methyl-4-selenazoline, as a selenium supplement by investigating the influence of its short-term administration on Se accumulation and antioxidant status in kidney. For 10 days, adolescent male Wistar rats were treated with saline (control group), Na(2)SeO(3) (Se-IN group) or the studied compound (Se-ORG group) (5 x 10(-4) mg Se/g of once a day) via a stomach tube. The selenium concentration, total antioxidant status (TAS), activities of the antioxidant enzymes superoxide dismutase (SOD) and glutathione peroxidase (GPx), concentrations of ascorbic acid (AA) and reduced glutathione (GSH) and concentration of malonyldialdehyde (MDA) were determined in the kidney homogenates. TAS was significantly reduced in the Se-ORG group compared to the control. Reduced glutathione was markedly decreased in Se-treated animals compared to the control and in the Se-ORG group compared to the Se-IN group. Malonyldialdehyde was significantly increased in the Se-supplemented groups compared to the control group but considerably less so in the Se-ORG group. All other studied parameters displayed no significant differences. No increase in the accumulation of selenium and the partial impairment of the antioxidant status and enhancement of lipid peroxidation in the kidneys resulting from Se treatment could suggest that in the first period of administration, excess selenium was excreted with urine, leading to a disturbance of kidney functions. Comparison of the effect of our compound with that exerted by inorganic Na(2)SeO(3) suggests that the studied compound could be considered as a possible supplement after further investigations, including determination of selenium excretion with urine, as well as repetition of this study using a wide range of doses and periods of supplementation.