Synthesis and biological evaluation of novel salicylidene uracils: Cytotoxic activity on human cancer cell lines and inhibitory action on enzymatic activity.

A series of salicylidene uracil (1-18) derived from 5-aminouracil and substituted salicylaldehydes were analyzed for cytotoxic activity and enzyme inhibitory potency. Nine out of eighteen derivatives (6-8, 10, 12-15, 18) are novel molecules synthesized for the first time in this work, and other derivatives were previously synthesized by our group. The compounds were characterized by Proton nuclear magnetic resonance, carbon nuclear magnetic resonance, fourier transform infrared spectroscopy, and elemental analysis. All compounds were tested for their in vitro cytotoxicity against PC-3 (human prostate adenocarcinoma), A549 (human alveolar adenocarcinoma), and SHSY-5Y (human neuroblastoma) cancer cell lines and the nontumorigenic HEK293 (human embryonic kidney cells) cell line. The 3,5-di-tert-butylsalicylaldehyde derived compound (8) was toxic to PC-3 human prostate adenocarcinoma cells, showing a promising IC50 value at 7.05 ± 0.76 µM. The present study also aimed to evaluate the inhibitory effects of the compounds against several key enzymes, namely carbonic anhydrase I and II (CA I and CA II), acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and glutathione reductase (GR), which are implicated in various global disorders, such as Alzheimer's disease, epilepsy, cancer, malaria, diabetes, and glaucoma. The inhibitory profiles of the tested compounds were assessed by determining their Ki values, which ranged from 2.96 to 9.24 nM for AChE, 3.78 to 12.57 nM for BChE, 8.42 to 25.74 nM for CA I, 7.24 to 19.74 nM for CA II, and 0.541 to 1.124 µM for GR. Molecular docking studies were also performed for all compounds. Most derivatives exhibited much more effective inhibitory action compared with clinically used standards. Thus, our findings indicate that the salicylidene derivatives presented in this study are promising drug candidates that need further evaluation.

To what extent are orally ingested nanoplastics toxic to the hippocampus in young adult rats?

As the use of plastic-containing materials in our daily lives becomes increasingly common, exposure to nanoplastics accordingly becomes inevitable. Micro and nanoplastics released from large amounts of plastic waste constitute a serious environmental problem. Therefore, this study aimed to examine the effects of polystyrene nanoplastic (PS-NP) on the hippocampus. MATERIAL AND METHOD: Thirty Wistar albino rats, 15 male and 15 female, aged 6-8 weeks, were used in the research. These were randomly divided into three groups of five males and five females each. A five-minute open field test was applied to all rats on the first and last days of the study. Three groups of rats (Control, NP1 and NP2) received the standard chow and water. Additionally, rats in the first neoplastic group (NP1) received 25 mg/kg PS-NP and rats in the second nanoplastic group (NP2) received 50 mg/kg PS-NP, at the same time each day by oral gavage. The rats were sacrificed under deep anesthesia at the end of four weeks. The hippocampi were removed and subjected to histopathological and biochemical analyses. RESULTS: Green fluorescent dots were detected in the hippocampi of both dose groups receiving nanoplastics (NPs) administered orally to female and male rats. Histopathological examination revealed neuronal degeneration in the hippocampi of male and female rats from both dose groups. However, while no significant difference was observed among the groups in terms of changes in antioxidant enzyme values and open-field test data in male rats, significant differences in peroxidase (POD) and glutathione S-transferase (GST) values and fecal boli and grooming numbers were determined in female rats exposed to NPs. In conclusion, exposure to NP substances extend as far as the hippocampus, causing neuronal damage and behavioral problems.

Chronic hypoxia and hyperoxia alter tissue-specific fatty acid profile and FD6D and elongase gene expression levels in rainbow trout (Oncorhynchus mykiss).

Commercially important trout species, especially rainbow trout, are under great threat due to several negative factors affecting oxygen levels in water such as global warming and eutrophication. In our study, rainbow trout (Oncorhynchus mykiss) was exposed to chronic (for 28 days) hypoxia (4.0 ± 0.5 mg/L) and hyperoxia (12 ± 1.2 mg/L) in order to evaluate the alteration of fatty acid profiles in muscle, liver and gill tissues. In addition, delta-6-desaturase and elongase gene expression profiles were measured in liver, kidney and gill tissues. The amount of saturated fatty acids increased by oxygen applications in the liver, while it decreased in the muscle and gill tissues compared to normoxia (p < 0.05). Monounsaturated fatty acids levels increased in muscle and gill (p < 0.05). Although n-3 polyunsaturated fatty acid (PUFA) decreased in muscle tissue, n-6 PUFA increased (p < 0.05). The n-3/n-6 ratio decreased in muscle tissue in response to the both exposures (p < 0.05) as well as eicosapentaenoic acid/docosahexaenoic acid ratio (p < 0.05). Hypoxia exposure generally increased delta-6-desaturase and elongase mRNA levels in all tissues (p < 0.05). However, gene expression profiles were variable in fish exposed to hyperoxia. As a result of oxygen exposures, the lipid profile of muscle tissue, which stores dense fat, was negatively affected more than that of liver and gill tissues. We determined that the change in expression levels was tissue specific.

The effect of subclinical hypothyroidism on ovarian volume in prepubertal girls.

OBJECTIVE: Enlargement and cystic changes in ovaries of patients with long-standing overt hypothyroidism have been described in numerous case reports. However, there are limited data about the effect of subclinical hypothyroidism (SH) on ovarian volume. The aim of the study is to evaluate the relationship between serum thyroid stimulating hormone (TSH) level and ovarian volume in prepubertal girls with SH. METHODS: Patients who were aged between 6 and 10 years and diagnosed with SH and age-matched healthy euthyroid controls were enrolled in the study. All subjects were prepubertal. RESULTS: Thirty-five children with SH (mean age; 7.6±1.0 years) and 50 euthyroid healthy girls (mean age; 7.7±1.2 years) were enrolled in the study. TSH and LH levels and both ovarian volumes were significantly higher in SH group than controls (p<0.05). In addition, TSH was positively correlated with ovarian volumes and LH in patients with SH (p<0.05). CONCLUSION: The results of this study showed that ovarian volumes of prepubertal girls with SH were significantly greater than those with normal thyroid function. Although ovarian enlargement and cyst formation is well recognized in long-standing overt hypothyroidism, it has been shown for the 1st time in patients with SH.

Inhibitory effects of sulfenimides on human and bovine carbonic anhydrase enzymes.

A series of sulfenimide derivatives (1a-i) were investigated as inhibitors of human (hCA-I, hCA-II) and bovine (bCA) carbonic anhydrase enzymes. The compounds were synthesised by the reaction of substituted thiophenols with phthalimide by means of an effective, simple and eco-friendly method and the structures were confirmed by IR, 1H NMR, 13C NMR, MS and elemental analysis. All derivatives except for the methyl derivative (1b) exhibited effective inhibitory action at low micromolar concentrations on human isoforms, but only four derivatives (1e, 1f, 1h, 1i) inhibited the bovine enzyme. The bromo derivative (1f) was found to be strongest inhibitor of all three enzymes with KI values of 0.023, 0.044 and 20.57 µM for hCA-I, hCA-II and bCA, respectively. Results of our study will make valuable contributions to carbonic anhydrase inhibition studies for further investigations since inhibitors of this enzyme are important molecules for medicinal chemistry.

Partial Purification of Glutathione S-transferase Enzyme From the Seed of Mallow (Malva Slyvestris L.) and Investigation of the Inhibition Kinetics of Some Heavy Metals.

Glutathione S-Transferase (GST) enzyme is abundant in mammals, insects, fish and microorganisms, as well as in various tissues of these species, particularly in tissues exposed to xenobiotics from the environment. As a result, the enzyme execute detoxifying function by scavenging a diverse range of xenobiotics, such as chemotherapeutic medicines, environmental carcinogens and endogenous compounds. In this study, GST enzyme was partially purified from mallow (Malva slyvestris L.) seed for the first time and the kinetic parameters were determined. The optimum ionic intensity was found in 400 mM Tris-Buffer, optimum pH: 7.0, and optimum substrate concentration was determined as 0.2 mM. One of the biggest reasons for deterioration of ecological balance in nature is heavy metal accumulation in soil, air and water which becomes a major threat to the vital activities of living things. In this study, inhibitory effects of Cd+ 2, Ag+, Zn+ 2 and Fe+ 3 heavy metals, which are common in nature, on mallow seed glutathione S-transferase enzyme were investigated. Each heavy metal showed micromolar inhibitory effects on enzyme activity. IC50 values of the metals were calculated as 60.93, 74.602, 178.22 and 369 µM, respectively.

Extraction and Characterization of Protein Concentrates from Limpets (Patella vulgata) and Peptide Release Following Gastrointestinal Digestion.

This study investigated the characterization of proteins from the Irish limpet (Patella vulgata) and assessed the in vitro biological activities of hydrolysates obtained following gastrointestinal digestion (INFOGEST) of a limpet protein concentrate (LPC). The physicochemical properties and the digestibility of the LPC were investigated, along with the angiotensin-converting enzyme (ACE) inhibition and antioxidant activities of the LPC-digested samples. All the digested samples examined outperformed the LPC in terms of activity. Peptides were identified using LC-MS/MS after digestion. A total of 38 and 19 peptides were identified in LPC-G and LPC-GI, respectively, using a database search and a de novo approach. Most of the identified peptides had hydrophobic amino acids, which may contribute to their antioxidant and ACE inhibitory activities. The findings of this study showed that LPC has high nutritional quality with good digestibility and could serve as a potential source of antioxidative and ACE inhibitory peptides following gastrointestinal digestion.

Effects of hypoxia and hyperoxia on growth parameters and transcription levels of growth, immune system and stress related genes in rainbow trout.

Hypoxia and hyperoxia are disparate stressors which can have destructive influences on fish growth and physiology. It is yet to be determined if hypoxia and hyperoxia have a cumulative effect in aquatic ecosystems that affect biological parameters in fish, and to understand if this is associated with gene expression. Here we address whether growth performance and expressions of growth, immune system and stress related genes were affected by hypoxia and hyperoxia in fish. Rainbow trout was chosen as the study organism due to its excellent service as biomonitor. After an acclimatization period, fish were exposed to hypoxia (4.0 ± 0.5 ppm O2), normoxia (7.5 ± 0.5 ppm O2) and hyperoxia (12 ± 1.2 ppm O2) for 28 days. At 6 h, 12 h, 24 h, 48 h, 72 h and 28 days, samples were collected. Hypoxia and hyperoxia negatively affected weight gain (WG), specific growth rate (SGR), survival rate (SR) and feed conversion ratio (FCR). The best WG, SGR, SR and FCR values occurred in fish exposed to normoxia, whereas hypoxia was most suppressive on growth and hyperoxia showed intermediate suppression of these parameters. Gene expression analyses were performed in liver and results revealed that long term exposure caused reduced growth hormone-I (GH-I) and insulin like growth factor I-II (IGF I-II) levels in both hypoxia and hyperoxia-treated fish. Heat shock protein (HSP70) levels increased in both hypoxia and hyperoxia treatment, and both exposures caused elevation of leptin (LEP) expression in long-term exposure. Overall data indicate that both hypoxia and hyperoxia cause stress in rainbow trout and negatively affects growth parameters.

Dietary inclusion of royal jelly modulates gene expression and activity of oxidative stress enzymes in zebrafish.

Here we investigated the effects of different levels of royal jelly in zebrafish (Danio rerio) diets [0.0% (D1); 0.1% (D2); 0.4% (D3); 1.6% (D4) vs 6.4% (D5)] on the activity and expression profiles of superoxide dismutase, catalase, glutathione reductase, glutathione peroxidase and glutathione S-transferase. Muscle, liver and kidney tissue samples were obtained from fish fed during 8 weeks. In these tissues, enzyme activity was determined by means of spectrophotometer and gene expression by quantitative real-time PCR. mRNA levels of the enzymes were elevated in almost all diet groups compared to the control (D1). It was determined that enzyme activities were also increased in general by supplementation of royal jelly although some decreases were also observed. However, the significant correlation between gene expression and enzyme activity was not observed in all tissues. It was concluded that main regulation occurs with post-translational modifications although effects at transcriptomic level demonstrated a snap variation.

Investigation of pesticides on honey bee carbonic anhydrase inhibition.

Carbonic anhydrase (CA, EC 4.2.1.1) plays crucial physiological roles in many different organisms, such as in pH regulation, ion transport, and metabolic processes. CA was isolated from the European bee Apis mellifera (AmCA) spermatheca and inhibitory effects of pesticides belonging to various classes, such as carbamates, thiophosphates, and pyrethroids, were investigated herein. The inhibitory effects of methomyl, oxamyl, deltamethrin, cypermethrin, dichlorodiphenyltrichloroethane (DDT) and diazinon on AmCA were analysed. These pesticides showed effective in vitro inhibition of the enzyme, at sub-micromolar levels. The IC50 values for these pesticides ranged between of 0.0023 and 0.0385 µM. The CA inhibition mechanism with these compounds is unknown at the moment, but most of them contain ester functionalities which may be hydrolysed by the enzyme with the formation of intermediates that can either react with amino acid residues or bid to the zinc ion from the active site.

Conventional Cytogenetics and Interphase Fluorescence In Situ Hybridization Results in Multiple Myeloma: A Turkey Laboratory Analysis of 381 Cases.

Multiple myeloma (MM) is an uncontrolled proliferation of plasma cells and these cells play an important role in the immune system. In this research, we retrospectively analyzed cytogenetic abnormalities in 381 patients with MM. Conventional cytogenetic analysis was successful in 354 patients (92.9%). Chromosomal abnormalities were detected in 31.9% (113/354) and 45.8% (116/253) of patients screened with conventional cytogenetics and FISH, respectively. Of 113 patients with chromosomal abnormalities, 31 patients (27.4%) had hyperdiploid and 26 of 31 patients with hyperdiploidy had both numerical and structural anomalies. On the other hand, non-hyperdiploidy was observed in 62 patients (54.8%). The most common gains of chromosomes were 15, 9, 19 followed by 3, 5, 11, and 21. Whole chromosome losses were also frequent involving Y, 13 and 22 chromosomes. In our patients, 1q gain was determined in a total of 25 patients (22%), including 7 structural abnormalities and 19 unbalanced translocations causing complete or partial duplication of the long arm of chromosome 1. Although the breakpoints were different, t(1;5) balanced translocation and unbalanced translocations of t(1;2), t(1;3), t(1;7), t(1;16) and t(1;19) were observed twice. The most common structural abnormality was the deletion of the short arm of chromosome 13 (13q) or monosomy of chromosome 13 (-13) (24.1%, 61/253) in patients evaluated by FISH. Deletion involving chromosome 17p (del 17p) or monosomy of chromosome 17 (-17) were found in 31 (12.3%) patients. Translocations involving IgH regions were as follows: t(11;14)(q13;q32.33) in 22 (8.7%), t(4;14)(p16.3;q32.33) in 22 (8.7%) and t(14;16)(q32.33;q23.1) in 2 (0.8%) patients. In addition, t(14;17)(q32;q21) translocation was detected in a multiple myeloma patient for the first time in this study. There are a limited number of large study groups including both cytogenetic and FISH findings in MM patients. As the number of these studies increases, it is thought that new cytogenetic data can be guiding especially in clinical risk determination.

Synthesis and characterization of some new pyrazolines and their inhibitory potencies against carbonic anhydrases.

The inhibition of the two human cytosolic carbonic anhydrase (hCA; EC 4.2.1.1) isozymes I and II with some new pyrazoline derivatives was investigated for the first time. The structures of the newly synthesized pyrazoline derivatives were characterized by Fourier transform-infrared spectroscopy, 1 H-/13 C-nuclear magnetic resonance, and mass spectrometry, and elemental analysis. Compounds 1-6 showed Ki values in the range of 16.4-205.9 nM for hCA I and of 6.08-93.21 nM against hCA II. These hydroxyl and amino group-containing compounds generally were competitive inhibitors. The compounds investigated here showed effective hCA I and II inhibitory effects, in the same range as the clinically used acetazolamide, and might be used as leads for generating enzyme inhibitors, possibly targeting other CA isoforms that have not yet been assayed for their interactions with such agents.

Design, synthesis and molecular modelling studies of some pyrazole derivatives as carbonic anhydrase inhibitors.

In this study, newly synthesised compounds 6, 8, 10 and other compounds (1-5, 7 and 9) and their inhibitory properties against the human isoforms hCA I and hCA II were reported for the first time. Compounds 1-10 showed effective inhibition profiles with KI values in the range of 5.13-16.9 nM for hCA I and of 11.77-67.39 nM against hCA II, respectively. Molecular docking studies were also performed with Glide XP to get insight into the inhibitory activity and to evaluate the binding modes of the synthesised compounds to hCA I and II. More rigorous binding energy calculations using MM-GBSA protocol which agreed well with observed activities were then performed to improve the docking scores. Results of in silico calculations showed that all compounds obey drug likeness properties. The new compounds reported here might be promising lead compounds for the development of new potent inhibitors as alternatives to classical hCA inhibitors.

Inhibition of acetylcholinesterase and butyrylcholinesterase with uracil derivatives: kinetic and computational studies.

Acetylcholinesterase (AChE) and Butyrylcholinesterase (BuChE) inhibitors are interesting compounds for different therapeutic applications, among which Alzheimer's disease. Here, we investigated the inhibition of these cholinesterases with uracil derivatives. The mechanism of inhibition of these enzymes was observed to be due to obstruction of the active site entrance by the inhibitors scaffold. Molecular docking and molecular dynamics (MD) simulations demonstrated the possible key interactions between the studied ligands and amino acid residues at different regions of the active sites of AChE and BuChE. Being diverse of the classical AChE and BuChE inhibitors, the investigated uracil derivatives may be used as lead molecules for designing new therapeutically effective enzyme inhibitors.

Determination of the inhibitory effects of N-methylpyrrole derivatives on glutathione reductase enzyme.

Glutathione reductase (GR) is a crucial antioxidant enzyme which is responsible for the maintenance of antioxidant GSH molecule. Antimalarial effects of some chemical molecules are attributed to their inhibition of GR, thus inhibitors of this enzyme are expected to be promising candidates for the treatment of malaria. In this work, GR inhibitory properties of N-Methylpyrrole derivatives are reported. It was found that all compounds have better inhibitory activity than the strong GR inhibitor N,N-bis(2-chloroethyl)-N-nitrosourea, especially three molecules, 8 m, 8 n, and 8 q, were determined to be the most powerful among them. Findings of our study indicates that these Schiff base derivatives are strong GR inhibitors which can be used as leads for designation of novel antimalarial candidates.

Comparison of blood carbonic anhydrase activity of athletes performing interval and continuous running exercise at high altitude.

The effects of high-intensity interval and continuous exercise on erythrocytes carbonic anhydrase (CA, EC 4.2.1.1) activity levels were scarcely investigated up until now. Here we present a study focused on the CA activity from erythrocytes of athletes experiencing interval and continuous training for 6 weeks, during cold weather and at high altitude (> 1600 m). We observed a 50% increase in the blood CA activity at the second week after initiation of the training in both interval and continuos running groups, whereas the control group did not experience any variation in the enzyme activity levels. In the trained individuals a mild decrease in their body mass, BMI and an increased [Formula: see text] were also observed. The CA activity returned at the basal values after 4-6 weeks after the training started, probably proving that a metabolic compensation occurred without the need of an enhanced enzyme activity. The unexpected 50% rise of activity for an enzyme which acts as a very efficient catalyst for CO2 hydration/bicarbonate dehydration, such as the blood CA, deserves further investigations for better understanding the physiologic basis of this phenomenon.

Effects of Feeding Honey Bees (Hymenoptera: Apidae) With Industrial Sugars Produced by Plants Using Different Photosynthetic Cycles (Carbon C3 and C4) on the Colony Wintering Ability, Lifespan, and Forage Behavior.

In the study, 130 honey bee colonies fed with different levels (5, 20, and 100 liters/colony) of various industrial commercial sugars, including High-Fructose Corn 85 (Fructose-85), High-Fructose Corn 55 (Fructose-55), Glucose Monohydrate (Glucose), Bee feed, and Sucrose syrups, for 2 mo were compared with colonies fed with no sugar (control) in terms of their colony development of worker bee population, hive weight, wax production, wintering ability, foraging behavior, and lifespan of worker bee. Utilization of industrial sugars by honey bee colonies showed differences in terms of colony performance and behavior parameters. Honey bees did not use Glucose heavily, resulting in 4% increase in worker bee loss in winter and 46% decrease in marked worker bee numbers over time when compared to the control. Sucrose syrup had a positive effect on wintering ability, wax production, and hive weight. While Sucrose had a positive effect (3-4%) on wintering ability, the 100 liters/colony sugar syrups of all other sugars had negative effects (6-15%). Sugars containing high levels of monosaccharide were not used effectively by honey bee colonies, whereas the sugars containing fructose and glucose at rates of 40 and 30% (Bee feed and Fructose-55), were utilized effectively. The lifespan of worker bees decreased over time in the 100 liters/colony of all sugars syrup. In conclusion, except Glucose, other industrial sugars can be used for promoting colonies at the beginning of the season (in spring). Industrial sugars except sucrose should not be used in order to meet carbohydrate needs of the colonies in winter.

Carbonic anhydrase inhibitory properties of some uracil derivatives.

Inhibitors of carbonic anhydrase (CA) have been carried out in many therapeutic applications, especially antiglaucoma activity. In this study, we investigated some uracil derivatives (4-12) to inhibit human CA I (hCA I) and II (hCA II) isoenzymes. The KI values of the compounds 4-12 are in the range of 0.085-428 µM for hCA I and of 0.1715-645 µM against hCA II, respectively. It is concluded from the kinetic investigations, all compounds used in the study act as competitive inhibitors with substrate, 4-NPA. Uracil derivatives are emerging agents for the inhibiton of carbonic anhydrase which could be used in biomedicine.

Carbonic anhydrase from Apis mellifera: purification and inhibition by pesticides.

Carbonic anhydrase (CA) enzymes have been shown to play an important role in ion transport and in pH regulation in several organisms. Despite this information and the wealth of knowledge regarding the significance of CA enzymes, few studies have been reported about bee CA enzymes and the hazardous effects of chemicals. Using Apis mellifera as a model, this study aimed to determine the risk of pesticides on Apis mellifera Carbonic anhydrase enzyme (Am CA). CA was initially purified from Apis mellifera spermatheca for the first time in the literature. The enzyme was purified with an overall purification of ∼35-fold with a molecular weight of ∼32 kDa. The enzyme was then exposed to pesticides, including tebuconazole, propoxur, carbaryl, carbofuran, simazine and atrazine. The six pesticides dose-dependently inhibited in vitro AmCA activity at low micromolar concentrations. IC50 values for the pesticides were 0.0030, 0.0321, 0.0031, 0.0087, 0.0273 and 0.0165 µM, respectively. The AmCA inhibition mechanism of these compounds is unknown at this moment.

Synthesis and Biological Evaluation of Novel Bischalcone Derivatives as Carbonic Anhydrase Inhibitors.

Design and synthesis of a new type of bischalcones as an alternative to natural and synthetic bischalcones are reported for the first time. Key steps involved the solvent-free Claisen-Schmidt condensation of chalcones, and the successful first application of the diazotization-diazocoupling reaction in the synthesis of CNNC-linked bischalcones by simple structural modification of p-aminoacetophenone. The structures of all compounds were confirmed by means of FT-IR, (1) H and (13) C NMR, ESI/MS, and elemental analysis. In addition, the newly synthesized compounds were screened for carbonic anhydrase inhibition activities. Almost all bischalcones exhibited moderate-to-good inhibitory activities.