Sinteza, in vitro antitumorsko ispitivanje i radiosenzitirajuće vrednovanje novih derivata 4-[3-(supstituiranih)tioureido]-N-(kinoksalin-2-il)benzensulfonamida

Sulfonamides and quinoxaline derivatives possess many types of biological activities and have been recently reported to show substantial antitumor activity. This paper reports the synthesis of novel thioureidosulfaquinoxaline derivatives. All the newly synthesized compounds were evaluated for their in vitro anticancer activity against a human liver cell line (HEPG2) and showed higher activity than the reference drug doxorubicin. 4-(3-(4-Ethylbenzoate)thioureido)-N-(quinoxalin-2-yl)benzenesulfonamide (9) (IC50 = 15.6 µmol L1), N-(pyridin-2-yl)-4-(3-(4-(N-quinoxalin-2-yl-sulfamoyl)phenyl)thioureido)benzene-sulfonamide (10) (IC50 = 26.8 µmol L1) and N-(quinoxalin-2-yl)-4-(3-(4-(N-thiazol-2-ylsulfamoyl)phenyl)thioureido)benzenesulfonamide (11) (IC50 = 24.4 µmol L1) were the most potent compared to doxorubicin (IC50 = 71.8 µmol L1). The most potent compounds 9, 10 and 11 were evaluated as radiosensitizing agents by subjecting the compounds to γ-irradiation (8 kGy).Derivati sulfonamida i kinoksalina imaju raznoliko biološko djelovanje, između ostalog i antitumorsko djelovanje. U radu je opisana sinteza novih derivata tioureido sulfakinoksalina. Svim novim spojevima ispitano je antitumorsko djelovanje in vitro na humanoj staničnoj liniji jetre (HEPG 2). Svi ispitani spojevi pokazuju jači učinak nego referentni lijek doksorubicin. Najjači učinak imali su 4-(3-(4-etilbenzoat)tioureido)-N-(kinoksalin-2-il)benzen-sulfonamid (9) (IC50 = 15,6 µmol L1), N-(piridin-2-il)-4-(3-(4-(N-kinoksalin-2-il-sulfamoil)fenil)tioureido)-benzen-sulfonamid (10) (IC50 = 26,8 µmol L1) i N-(kinoksalin-2-il)-4-(3-(4-(N-tiazol-2-ilsulfamoil)fenil)tioureido)benzen-sulfonamid (11) (IC50 = 24,4 µmol L1), dok je IC50 vrijednost bila 71,8 µmol L1. Najaktivniji spojevi 9, 10 i 11 evaluirani su kao radziosenzitirajuća sredstva nakon izlaganja spojeva γ-zračenju (8 kGy)

Sinteza i protuupalno, analgetsko i ulcerogeno djelovanje derivata tieno[2,3-d]pirimidina

5-Methyl-6-phenyl-2-thioxothieno[2,3-d]pyrimidone derivative (2) reacted with hydrazonoyl chloride derivatives to afford triazolothienopyrimidones 4a-f. Also, acetone-1-(2-amino-5-isopropyl-thiophene-3-carbonitrile) (3) reacted with functional and bifunctional groups to yield the corresponding compounds 5-11. The new products showed anti-inflammatory, analgesic, and ulcerogenic activities comparable to that of indomethacin and acetylsalicylic acid, respectively.Reakcijom derivata 5-metil-6-fenil-2-tioksotieno[2,3-d]pirimidona (2) s hidrazonoil kloridima dobiveni su triazolotienopirimidoni 4a-f, a reakcijom aceton-1-(2-amino-5-izopropil-tiopen-3-karbonitrila (3) s funkcionalnim i bifunkcionalnim spojevima dobiveni su produkti 511. Novi spojevi imaju slično protuupalno, analgetsko i ulcerogeno djelovanje kao i indometacin, odnosno acetilsalicilna kiselina

MHC class I A region diversity and polymorphism in macaque species

The HLA-A locus represents a single copy gene that displays abundant allelic polymorphism in the human population, whereas, in contrast, a nonhuman primate species such as the rhesus macaque (Macaca mulatta) possesses multiple HLA-A-like (Mamu-A) genes, which parade varying degrees of polymorphism. The number and combination of transcribed Mamu-A genes present per chromosome display diversity in a population of Indian animals. At present, it is not clearly understood whether these different A region configurations are evolutionarily stable entities. To shed light on this issue, rhesus macaques from a Chinese population and a panel of cynomolgus monkeys (Macaca fascicularis) were screened for various A region-linked variations. Comparisons demonstrated that most A region configurations are old entities predating macaque speciation, whereas most allelic variation (>95%) is of more recent origin. The latter situation contrasts the observations of the major histocompatibility complex class II genes in rhesus and cynomolgus macaques, which share a high number of identical alleles (>30%) as defined by exon 2 sequencing

Scientific assessment of the use of sugars as cigarette tobacco ingredients: A review of published and other publicly available studies

Sugars, such as sucrose or invert sugar, have been used as tobacco ingredients in American-blend cigarettes to replenish the sugars lost during curing of the Burley component of the blended tobacco in order to maintain a balanced flavor. Chemical-analytical studies of the mainstream smoke of research cigarettes with various sugar application levels revealed that most of the smoke constituents determined did not show any sugar-related changes in yields (per mg nicotine), while ten constituents were found to either increase (formaldehyde, acrolein, 2-butanone, isoprene, benzene, toluene, benzo[k]fluoranthene) or decrease (4-aminobiphenyl, N-nitrosodimethylamine, N-nitrosonornicotine) in a statistically significant manner with increasing sugar application levels. Such constituent yields were modeled into constituent uptake distributions using simulations of nicotine uptake distributions generated on the basis of published nicotine biomonitoring data, which were multiplied by the constituent/nicotine ratios determined in the current analysis. These simulations revealed extensive overlaps for the constituent uptake distributions with and without sugar application. Moreover, the differences in smoke composition did not lead to relevant changes in the activity in in vitro or in vivo assays. The potential impact of using sugars as tobacco ingredients was further assessed in an indirect manner by comparing published data from markets with predominantly American-blend or Virginia-type (no added sugars) cigarettes. No relevant difference was found between these markets for smoking prevalence, intensity, some markers of dependence, nicotine uptake, or mortality from smoking-related lung cancer and chronic obstructive pulmonary disease. In conclusion, thorough examination of the data available suggests that the use of sugars as ingredients in cigarette tobacco does not increase the inherent risk and harm of cigarette smoking

The genetic architecture of the human cerebral cortex

The cerebral cortex underlies our complex cognitive capabilities, yet little is known about the specific genetic loci that influence human cortical structure. To identify genetic variants that affect cortical structure, we conducted a genome-wide association meta-analysis of brain magnetic resonance imaging data from 51,665 individuals. We analyzed the surface area and average thickness of the whole cortex and 34 regions with known functional specializations. We identified 199 significant loci and found significant enrichment for loci influencing total surface area within regulatory elements that are active during prenatal cortical development, supporting the radial unit hypothesis. Loci that affect regional surface area cluster near genes in Wnt signaling pathways, which influence progenitor expansion and areal identity. Variation in cortical structure is genetically correlated with cognitive function, Parkinson's disease, insomnia, depression, neuroticism, and attention deficit hyperactivity disorder

Some reactions with quinoxaline-2,3-dicarboxylic acid anhydride: Novel synthesis of thieno[2,3-<i>d</i>]pyrimidines and pyrrolo [3,4-<i>b</i>]quinoxalines as antimicrobial agents

1486-1491The reactivity of quinoxaline-2,3-dicarboxylic anhydride 1 towards some heterocyclic amines as nitrogen nucleophiles has been investigated. Cyclic anhydride 1 on treatment with 2-aminobenzo[b]thiophenes 2a-c in refluxing ethanol, gives novel substituted quinoxalines 3a-c. On the other hand, fusion of compound 1 and 2b,c furnishes the corresponding quinoxalines 4a,b. Double cyclization occurs when compound 3b is refluxed with hydrazine hydrate to furnis polyheterocyclic system 6. Pyrroloquinoxalines 7a,b are obtained by refluxing compounds 3a,b in acetic anhydride. Dicarboxamides 8a-c are produced by fusion of 7b with aromatic amines. Thieno[2,3-d]pyrimidine 9 is obtained by refluxing the compound 4a or 4b with hydrazine hydrate. Condensation of compound 9 with aromatic aldehydes furnishes the corresponding Schiff bases 10a-c. Finally, refluxing of compound 9 with acetic anhydride yields the acetamido derivative 11

Some nucleophilic reactions with 6-benzoyl-2,3-dichloroquinoxaline: Synthesis of tetrazolo[l ,5-<i>a</i>]quinoxline, 2-methylidene-1,3-dithiolo[4,5-<i>b</i>]quinoxalines, quinoxalino[2,3-<i>b</i> ] quinoxalines and pyrazolo[1',5':1,2] imidazolo[4,5-<i>b</i>]quinoxalines

195-200The starting material 6-benzoyl-2, 3-dichloroquinoxaline 1 is subjected to some nucleophilic reagents to study the effect of benzoyl group on the reactivity of the two chlorine atoms

Activated nitriles in heterocyclic chemistry: Facile synthesis and antimicrobial activity of some pyrimidine, pyrazolopyrimidine and pyrazolotriazine derivatives containing sulfonamido moiety

2203-2211Novel pyrimidine, pyrazolopyrimidine and pyrazolotriazine derivatives containing sulfonyl moiety have been prepared using 4-(piperidin-l-sulfonyl)phenyl hydrazone 2 as a starting material. The antimicrobial activity of the prepared compounds is discussed and some of them are found to be active