Author: Jessica.F

Xia, Chengjie; Xu, Weiming; Ai, Xin; Zhu, Yingqi; Geng, Ping; Niu, Yijun; Zhu, Haiyan; Zhou, Wei; Huang, Hai; Shi, Xunlong published the artcile< Autophagy and exosome coordinately enhance macrophage M1 polarization and recruitment in influenza A virus infection>, SDS of cas: 6823-69-4, the main research area is influenza A virus infection autophagy exosome macrophage M1 polarization; CD63; LC3; influenza; macrophage; polarization.

Influenza A virus infection results in viral pneumonia, which is often accompanied by the infiltration and recruitment of macrophages, overactivation of inflammatory responses, and obvious cell autophagy and exosome production However, little is known about the roles of autophagy and exosome production in these inflammatory responses. In this study, multiple methods, such as flow cytometry, real-time quant. reverse transcription-polymerase chain reaction, immune-fluorescence technol., and western blot, were applied to explore the possible effects of autophagy and exosome production by H1N1-infected host cells. It was observed that a high number of polarized macrophages (CD11b+/F4/80+/ CD86+) were recruited to the lung tissues of infected mice, which could be mimicked by tracking the movement of macrophages to H1N1-infected cells in vitro (transwell assays). Furthermore, there was some coordinated upregulation of M1 polarization signs (iNOS/Arg-1 bias) as well as autophagy (LC3) and exosome (CD63) biomarkers in the infected macrophages and epithelial cells. Moreover, exosomes extracted from the supernatant of virus-infected cells were shown to promote the recruitment and polarization of more peritoneal macrophages than the normal group. The fluorescence colocalization of LC3-CD63 and the inhibition of autophagy and exosome signaling pathway further revealed that H1N1 infection seemed to sequentially activate the M1 polarization and recruitment of macrophages via autophagy-exosome dependent pathway. Autophagy and exosome production coordinately enhance the M1 polarization and recruitment of macrophages in influenza virus infection, which also provides potential therapeutic targets.

Frontiers in Immunology published new progress about Adhesion G protein-coupled receptor E1 Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 6823-69-4 belongs to class imidazoles-derivatives, and the molecular formula is C30H30Cl2N6O2, SDS of cas: 6823-69-4.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Li, Yuqing; Liu, Juewen published the artcile< Highly Specific Recognition of Guanosine Using Engineered Base-Excised Aptamers>, Related Products of 452-06-2, the main research area is guanosine base excised aptamers sodium secondary structure; DNA structures; aptamers; biosensors; fluorescence; nucleobases.

Purines and their derivatives are highly important mols. in biol. for nucleic acid synthesis, energy storage, and signaling. Although many DNA aptamers have been obtained for binding adenine derivatives such as adenosine, adenosine monophosphate, and ATP, success for the specific binding of guanosine has been limited. Instead of performing new aptamer selections, we report herein a base-excision strategy to engineer existing aptamers to bind guanosine. Both a Na+-binding aptamer and the classical adenosine aptamer have been manipulated as base-excising scaffolds. A total of seven guanosine aptamers were designed, of which the G16-deleted Na+ aptamer showed the highest bindng specificity and affinity for guanosine with an apparent dissociation constant of 0.78 mM. Single monophosphate difference in the target mol. was also recognizable. The generality of both the aptamer scaffold and excised site were systematically studied. Overall, this work provides a few guanosine binding aptamers by using a non-SELEX method. It also provides deeper insights into the engineering of aptamers for mol. recognition.

Chemistry – A European Journal published new progress about DNA aptamers Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 452-06-2 belongs to class imidazoles-derivatives, and the molecular formula is C5H5N5, Related Products of 452-06-2.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Young, Simon A.; Smith, Terry K. published the artcile< The essential neutral sphingomyelinase is involved in the trafficking of the variant surface glycoprotein in the bloodstream form of Trypanosoma brucei>, Synthetic Route of 6823-69-4, the main research area is neutral sphingomyelinase trafficking variant surface glycoprotein Trypanosoma drug target.

Sphingomyelin is the main sphingolipid in Trypanosoma brucei, the causative agent of African sleeping sickness. In vitro and in vivo characterization of the T. brucei neutral sphingomyelinase demonstrates that it is directly involved in sphingomyelin catabolism. Gene knockout studies in the bloodstream form of the parasite indicate that the neutral sphingomyelinase is essential for growth and survival, thus highlighting that the de novo biosynthesis of ceramide is unable to compensate for the loss of sphingomyelin catabolism. The phenotype of the conditional knockout has given new insights into the highly active endocytic and exocytic pathways in the bloodstream form of T. brucei. Hence, the formation of ceramide in the endoplasmic reticulum affects post-Golgi sorting and rate of deposition of newly synthesized GPI-anchored variant surface glycoprotein on the cell surface. This directly influences the corresponding rate of endocytosis, via the recycling endosomes, of pre-existing cell surface variant surface glycoprotein. The trypanosomes use this coupled endocytic and exocytic mechanism to maintain the cell d. of its crucial variant surface glycoprotein protective coat. TbnSMase is therefore genetically validated as a drug target against African trypanosomes, and suggests that interfering with the endocytic transport of variant surface glycoprotein is a highly desirable strategy for drug development against African trypanosomasis.

Molecular Microbiology published new progress about Biological transport. 6823-69-4 belongs to class imidazoles-derivatives, and the molecular formula is C30H30Cl2N6O2, Synthetic Route of 6823-69-4.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Bethel, Paul A.; Campbell, Andrew D.; Goldberg, Frederick W.; Kemmitt, Paul D.; Lamont, Gillian M.; Suleman, Abid published the artcile< Optimized scale up of 3-pyrimidinylpyrazolo[1,5-a]pyridine via Suzuki coupling; a general method of accessing a range of 3-(hetero)arylpyrazolo[1,5-a]pyridines>, Computed Properties of 1003-21-0, the main research area is Suzuki coupling pyrazolopyridine boronic ester; pyrazolopyridine heteroaryl aryl preparation.

We have developed an improved synthesis of 3-(hetero)aryl pyrazolo[1,5-a]pyridines [such as 3-(2,5-dichloropyrimidin-4-yl)pyrazolo[1,5-a]pyridine (I)] via an optimized synthesis and Suzuki coupling of 3-pyrazolo[1,5-a]pyridine boronic ester (II). These conditions are applicable to both high throughput chem. and large scale synthesis of these medicinally important compounds The scope of this chem. has been further extended to include the synthesis and coupling of a novel boronic ester, 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazine.

Tetrahedron published new progress about Heterocyclic compounds Role: RCT (Reactant), RACT (Reactant or Reagent) (halo). 1003-21-0 belongs to class imidazoles-derivatives, and the molecular formula is C4H5BrN2, Computed Properties of 1003-21-0.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Nejad, Maryam Imani; Price, Nathan E.; Haldar, Tuhin; Lewis, Calvin; Wang, Yinsheng; Gates, Kent S. published the artcile< Interstrand DNA cross-links derived from reaction of a 2-aminopurine residue with an abasic site>, Electric Literature of 452-06-2, the main research area is interstrand DNA crosslink derived reaction aminopurine abasic.

Efficient methods for the site-specific installation of structurally-defined interstrand crosslinks in duplex DNA may be useful in a wide variety of fields. The work described here developed a high-yield synthesis of chem. stable interstrand crosslinks resulting from a reductive amination reaction between an abasic site and the noncanonical nucleobase 2-aminopurine in duplex DNA. Results from footprinting, LC-MS, and stability studies support the formation of an N2-alkylamine attachment between the 2-aminopurine residue and the Ap site. The reaction performs best when the 2-aminopurine residue on the opposing strand is offset 1 nt to the 5′-side of the abasic site. The crosslink confers substantial resistance to thermal denaturation (melting). The crosslinking reaction is fast (complete in 4 h), employs only com. available reagents, and can be used to generate crosslinked duplexes in sufficient quantities for biophys., structural, and DNA repair studies.

ACS Chemical Biology published new progress about DNA damage. 452-06-2 belongs to class imidazoles-derivatives, and the molecular formula is C5H5N5, Electric Literature of 452-06-2.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Czernecki, Dariusz; Legrand, Pierre; Tekpinar, Mustafa; Rosario, Sandrine; Kaminski, Pierre-Alexandre; Delarue, Marc published the artcile< How cyanophage S-2L rejects adenine and incorporates 2-aminoadenine to saturate hydrogen bonding in its DNA>, Recommanded Product: 7H-Purin-2-amine, the main research area is .

Abstract: Bacteriophages have long been known to use modified bases in their DNA to prevent cleavage by the host′s restriction endonucleases. Among them, cyanophage S-2L is unique because its genome has all its adenines (A) systematically replaced by 2-aminoadenines (Z). Here, we identify a member of the PrimPol family as the sole possible polymerase of S-2L and we find it can incorporate both A and Z in front of a T. Its crystal structure at 1.5 Å resolution confirms that there is no structural element in the active site that could lead to the rejection of A in front of T. To resolve this contradiction, we show that a nearby gene is a triphosphohydolase specific of dATP (DatZ), that leaves intact all other dNTPs, including dZTP. This explains the absence of A in S-2L genome. Crystal structures of DatZ with various ligands, including one at sub-angstrom resolution, allow to describe its mechanism as a typical two-metal-ion mechanism and to set the stage for its engineering.

Nature Communications published new progress about 452-06-2. 452-06-2 belongs to class imidazoles-derivatives, and the molecular formula is C5H5N5, Recommanded Product: 7H-Purin-2-amine.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Iddon, Brian; Lim, Bee Lan published the artcile< Metal-halogen exchange reactions of mono- and polyhaloimidazoles>, Application In Synthesis of 1003-21-0, the main research area is exchange lithium halogen haloimidazole; haloimidazole lithiation alkylation; imidazole halo lithiation alkylation; ethoxymethylation lithiation haloimidazole; sulfuration lithiation haloimidazole; alkylhaloimidazole; methylthiophenylthioimidazole; phenylthioimidazole.

Treatment of 4(5)-bromoimidazole with 1-2 equiv BuLi in Et2O or THF followed by reaction with Me2SO4 gave 46-63% of a 1:1-3 mixture of 4- and 5-bromo-1-methylimidazole, resp. 5-Iodo- and 2,4,5-tribromo-1-methylimidazole were similarly prepared N-1-alkylation of tribromoimidazole with ClCH2OEt in C6H6 containing Et3N gave 2,4,5-tribromo-1-(ethoxymethyl)imidazole (I). Similar reaction of 2,4,5-triiodoimidazole required NaOMe in dioxane and gave mainly 1-ethoxymethyl-4,5-diiodoimidazole. Treatment of I with BuLi followed by (PhS)2 gave 67% 4,5-dibromo-1-(ethoxymethyl)-2-phenylthioimidazole, which on further treatment with BuLi followed by (MeS)2 gave 63% 4-bromo-1-(ethoxymethyl)-5-methylthio-2-phenylthioimidazole.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about Alkylation. 1003-21-0 belongs to class imidazoles-derivatives, and the molecular formula is C4H5BrN2, Application In Synthesis of 1003-21-0.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Ma, Wenqiang; Xu, Shuangping; Jia, Hongge; Xu, Jingyu; Liu, Da; Zhang, Mingyu; Qu, Yanqing; Zhou, Hailiang; Zhang, Yushu; Wang, Xintian; Zhao, Wenwen published the artcile< Preparation of Butadiene-Bridged Polymethylsiloxane/Ethylcellulose/1-Carboxymethyl-3-methylimidazolium Chloride Ternary Composite Membranes for Gas Separation>, Related Products of 700370-07-6, the main research area is butadiene bridged polymethylsiloxane ethylcellulose composite membrane.

Excessive CO2 emissions have resulted in global warming and are a serious threat to the life of people, various strategies have been implemented to cut carbon emissions, and one of them is the use of a gas separation membrane to capture CO2 effectively. In this experiment, the butadiene-bridged polymethylsiloxane (BBPMS)/ethyl cellulose (EC)/ionic liquid (IL) ternary composite membranes were prepared by EC as a substrate, BBPMS, and IL as additives in THF under high-speed stirring and coated on the membrane. The membrane structure was characterized by a Fourier transform IR spectrometer and scanning electron microscope, and the membrane properties were tested by a membrane tensile strength tester, thermal weight loss analyzer, and gas permeability meter. The results show that the surface of the ternary composite membrane is dense and flat with a uniform distribution, and the membrane formation, heat resistance, and mech. properties are good. The permeability coefficient of the ternary composite membrane for CO2 reached 1806.03 Barrer, which is 20.00 times higher than that of the EC/IL hybrid matrix membrane. The permeability coefficient of O2 reached 321.01 Barrer, which is 19.21 times higher than that of the EC/IL membrane. When the doping amount of BBPMS is 70-80%, the O2/N2 gas permeation separation of the BBPMS/EC/IL ternary composite membrane is close to the Robertson 2008 curve. It is always known that in the gas separation process the membrane material is the most crucial factor. The success of this experiment points to a new direction for the preparation of new membrane materials.

ACS Omega published new progress about Air pollution, carbon dioxide. 700370-07-6 belongs to class imidazoles-derivatives, and the molecular formula is C6H9ClN2O2, Related Products of 700370-07-6.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Szabla, Rafał; Zdrowowicz, Magdalena; Spisz, Paulina; Green, Nicholas J; Stadlbauer, Petr; Kruse, Holger; Šponer, Jiří; Rak, Janusz published the artcile< 2,6-diaminopurine promotes repair of DNA lesions under prebiotic conditions.>, Electric Literature of 452-06-2, the main research area is .

High-yielding and selective prebiotic syntheses of RNA and DNA nucleotides involve UV irradiation to promote the key reaction steps and eradicate biologically irrelevant isomers. While these syntheses were likely enabled by UV-rich prebiotic environment, UV-induced formation of photodamages in polymeric nucleic acids, such as cyclobutane pyrimidine dimers (CPDs), remains the key unresolved issue for the origins of RNA and DNA on Earth. Here, we demonstrate that substitution of adenine with 2,6-diaminopurine enables repair of CPDs with yields reaching 92%. This substantial self-repairing activity originates from excellent electron donating properties of 2,6-diaminopurine in nucleic acid strands. We also show that the deoxyribonucleosides of 2,6-diaminopurine and adenine can be formed under the same prebiotic conditions. Considering that 2,6-diaminopurine was previously shown to increase the rate of nonenzymatic RNA replication, this nucleobase could have played critical roles in the formation of functional and photostable RNA/DNA oligomers in UV-rich prebiotic environments.

Nature communications published new progress about 452-06-2. 452-06-2 belongs to class imidazoles-derivatives, and the molecular formula is C5H5N5, Electric Literature of 452-06-2.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Yue, Kang-Yi; Zhang, Pei-Ran; Zheng, Min-Hua; Cao, Xiu-Li; Cao, Yuan; Zhang, Yi-Zhe; Zhang, Yu-Fei; Wu, Hai-Ning; Lu, Zhi-Hong; Liang, Liang; Jiang, Xiao-Fan; Han, Hua published the artcile< Neurons can upregulate Cav-1 to increase intake of endothelial cells-derived extracellular vesicles that attenuate apoptosis via miR-1290>, Synthetic Route of 6823-69-4, the main research area is caveolin apoptosis exosome microRNA human neuron.

Extracellular vesicles (EVs) including exosomes can serve as mediators of cell-cell communication under physiol. and pathol. conditions. However, cargo mols. carried by EVs to exert their functions, as well as mechanisms for their regulated release and intake, have been poorly understood. In this study, we examined the effects of endothelial cells-derived EVs on neurons suffering from oxygen-glucose deprivation (OGD), which mimics neuronal ischemia-reperfusion injury in human diseases. In a human umbilical endothelial cell (HUVEC)-neuron coculture assay, we found that HUVECs reduced apoptosis of neurons under OGD, and this effect was compromised by GW4869, a blocker of exosome release. Purified EVs could be internalized by neurons and alleviate neuronal apoptosis under OGD. A miRNA, miR-1290, was highly enriched in HUVECs-derived EVs and was responsible for EV-mediated neuronal protection under OGD. Interestingly, we found that OGD enhanced intake of EVs by neurons cultured in-vitro. We examined the expression of several potential receptors for EV intake and found that caveolin-1 (Cav-1) was upregulated in OGD-treated neurons and mice suffering from middle cerebral artery occlusion (MCAO). Knock-down of Cav-1 in neurons reduced EV intake, and canceled EV-mediated neuronal protection under OGD. HUVEC-derived EVs alleviated MCAO-induced neuronal apoptosis in-vivo. These findings suggested that ischemia likely upregulates Cav-1 expression in neurons to increase EV intake, which protects neurons by attenuating apoptosis via miR-1290.

Cell Death & Disease published new progress about Apoptosis. 6823-69-4 belongs to class imidazoles-derivatives, and the molecular formula is C30H30Cl2N6O2, Synthetic Route of 6823-69-4.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem