Author: Jessica.F

Kavanagh, E. L.; Lindsay, S.; Halasz, M.; Gubbins, L. C.; Weiner-Gorzel, K.; Guang, M. H. Z.; McGoldrick, A.; Collins, E.; Henry, M.; Blanco-Fernandez, A.; Gorman, P. O.; Fitzpatrick, P.; Higgins, M. J.; Dowling, P.; McCann, A. published the artcile< Protein and chemotherapy profiling of extracellular vesicles harvested from therapeutic induced senescent triple negative breast cancer cells>, Related Products of 6823-69-4, the main research area is chemotherapy extracellular vesicle therapeutic induced senescent breast cancer.

Triple neg. breast cancer (TNBC) is an aggressive subtype with relatively poor clin. outcomes and limited treatment options. Chemotherapy, while killing cancer cells, can result in the generation of highly chemo resistant therapeutic induced senescent (TIS) cells that potentially form stem cell niches resulting in metastases. Intriguingly, senescent cells release significantly more extracellular vesicles (EVs) than non-senescent cells. Our aim was to profile EVs harvested from TIS TNBC cells compared with control cells to identify a potential mechanism by which TIS TNBC cells maintain survival in the face of chemotherapy. TIS was induced and confirmed in Cal51 TNBC cells using the chemotherapeutic paclitaxel (PTX) (Taxol). Mass spectrometry (MS) anal. of EVs harvested from TIS compared with control Cal51 cells was performed using Ingenuity Pathway Anal. and InnateDB programs. We demonstrate that TIS Cal51 cells treated with 75 nm PTX for 7 days became senescent (senescence-associated β-galactosidase (SA-β-Gal) pos., Ki67-neg., increased p21 and p16, G2/M cell cycle arrest) and released significantly more EVs (P = 0.0002) and exosomes (P = 0.0007) than non-senescent control cells. Moreover, TIS cells displayed an increased expression of the multidrug resistance protein 1/p-glycoprotein. MS anal. demonstrated that EVs derived from senescent Cal51 cells contained 142 proteins with a significant increased fold change compared with control EVs. Key proteins included ATPases, annexins, tubulins, integrins, Rabs and insoluble senescence-associated secretory phenotype (SASP) factors. A fluorescent analog of PTX (Flutax-2) allowed appreciation of the removal of chemotherapy in EVs from senescent cells. Treatment of TIS cells with the exosome biogenesis inhibitor GW4869 resulted in reduced SA-β-Gal staining (P = 0.04). In summary, this study demonstrates that TIS cells release significantly more EVs compared with control cells, containing chemotherapy and key proteins involved in cell proliferation, ATP depletion, apoptosis and the SASP. These findings may partially explain why cancer senescent cells remain viable despite chemo therapeutic challenge.

Oncogenesis published new progress about Annexins Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 6823-69-4 belongs to class imidazoles-derivatives, and the molecular formula is C30H30Cl2N6O2, Related Products of 6823-69-4.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Beckmann, Udo; Sueslueyan, Diyana; Kunz, PeterC. published the artcile< Is the 1JPSe Coupling Constant a Reliable Probe for the Basicity of Phosphines? A 31P NMR Study>, Recommanded Product: 5-Bromo-1-methyl-1H-imidazole, the main research area is coupling constant phosphine basicity probe.

The influence of different heteroaryl and functionalized aryl substituents on the electron-donating ability and basicity of the phosphorus atoms in heteroaryl phosphines and diphosphines has been determined by the use of the direct 1JPSe coupling constants of the corresponding selenides. The generality of the use of 31P-77Se spin-spin coupling constants as probe for the basicity of phosphines is discussed as well as the scope and limits of this concept.

Phosphorus, Sulfur and Silicon and the Related Elements published new progress about Basicity (Broensted). 1003-21-0 belongs to class imidazoles-derivatives, and the molecular formula is C4H5BrN2, Recommanded Product: 5-Bromo-1-methyl-1H-imidazole.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Daghlavi, Amneh; Kowsari, Elaheh; Abdouss, Majid; Ghasemi, Mohammad Hadi; Asadi, Elham published the artcile< Catalytic synthesis of thiazolidines by the reaction of Nef-isocyanide reaction>, COA of Formula: C7H12N2S, the main research area is phosphoric acid graphene oxide catalyst preparation thiazolidine Nef isocyanide.

A practical and efficient method for the synthesis of thiazolidine derivatives via Nef-isocyanide three-component reaction using supported phosphoric acid on graphene oxide (GO-H2PO4) is described. A relatively simple method starting with cyclic and acyclic thiourea was employed. The catalyst was characterized using FTIR, SEM, energy-dispersive x-ray spectroscopy, and X-ray diffraction techniques. Using a combination of acetonitrile as solvent and GO-H2PO4 as a catalytic system, the best results were obtained. All products were characterized using m.p., FTIR, MASS, 1H NMR, and 13C NMR techniques. The use of com. available chems., reusability of the catalyst, high yields, decreased environmental hazards, with no need for the separation of stereoisomers, and, consequently, a reduced number of overall steps are the advantages of this approach that make it an appropriate choice at an increased scale.

Research on Chemical Intermediates published new progress about Imidazoles Role: SPN (Synthetic Preparation), PREP (Preparation). 30086-64-7 belongs to class imidazoles-derivatives, and the molecular formula is C7H12N2S, COA of Formula: C7H12N2S.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Chen, Shuai; Graceffa, Russell F.; Boezio, Alessandro A. published the artcile< Direct, Regioselective N-Alkylation of 1,3-Azoles>, COA of Formula: C4H5BrN2, the main research area is regioselective alkylation azole purine organomagnesium reagent.

Regioselective N-alkylation of 1,3-azoles is a valuable transformation. Organomagnesium reagents were discovered to be competent bases to affect regioselective alkylation of various 1,3-azoles. Counterintuitively, substitution selectively occurred at the more sterically hindered nitrogen atom. Numerous examples are provided, on varying 1,3-azole scaffolds, with yields ranging from 25 to 95%.

Organic Letters published new progress about Alkylation, regioselective. 1003-21-0 belongs to class imidazoles-derivatives, and the molecular formula is C4H5BrN2, COA of Formula: C4H5BrN2.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Donate, Paula B.; de Lima, Kalil Alves; Peres, Raphael S.; Almeida, Fausto; Fukada, Sandra Y.; Silva, Tarcilia A.; Nascimento, Daniele C.; Cecilio, Nerry T.; Talbot, Jhimmy; Oliveira, Rene D.; Passos, Geraldo A.; Alves-Filho, Jose Carlos; Cunha, Thiago M.; Louzada-Junior, Paulo; Liew, Foo Y.; Cunha, Fernando Q. published the artcile< Cigarette smoke induces miR-132 in Th17 cells that enhance osteoclastogenesis in inflammatory arthritis>, Electric Literature of 6823-69-4, the main research area is rheumatoid arthritis osteoclastogenesis microRNA132 Th17 cell cigarette smoke; Th17; cigarette smoke; exosomes; osteoclastogenesis; rheumatoid arthritis.

Rheumatoid arthritis (RA) is a chronic inflammatory disease characterized by joint destruction and severe morbidity. Cigarette smoking (CS) can exacerbate the incidence and severity of RA. Although Th17 cells and the Aryl hydrocarbon receptor (AhR) have been implicated, the mechanism by which CS induces RA development remains unclear. Here, using transcriptomic anal., we show that microRNA-132 is specifically induced in Th17 cells in the presence of either AhR agonist or CS-enriched medium. miRNA-132 thus induced is packaged into extracellular vesicles produced by Th17 and acts as a proinflammatory mediator increasing osteoclastogenesis through the down-regulation of COX2. In vivo, articular knockdown of miR-132 in murine arthritis models reduces the number of osteoclasts in the joints. Clin., RA patients express higher levels of miR-132 than do healthy individuals. This increase is further elevated by cigarette smoking. Together, these results reveal a hitherto unrecognized mechanism by which CS could exacerbate RA and further advance understanding of the impact of environmental factors on the pathogenesis of chronic inflammatory diseases.

Proceedings of the National Academy of Sciences of the United States of America published new progress about Argonaute proteins Role: BSU (Biological Study, Unclassified), BIOL (Biological Study) (2). 6823-69-4 belongs to class imidazoles-derivatives, and the molecular formula is C30H30Cl2N6O2, Electric Literature of 6823-69-4.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Ilnytska, Olga; Jeziorek, Maciej; Lai, Kimberly; Altan-Bonnet, Nihal; Dobrowolski, Radek; Storch, Judith published the artcile< Lysobisphosphatidic acid (LBPA) enrichment promotes cholesterol egress via exosomes in Niemann Pick type C1 deficient cells>, Recommanded Product: p-Benzenediacrylanilide, 4′,4′′-di-2-imidazolin-2-yl-, dihydrochloride, the main research area is NPC1 exosome cholesterol egress lysobisphosphatidic acid; Bis(monoacylglycero)phosphate; Cholesterol; Exosomes; Extracellular vesicles; Lysobisphosphatidic acid; Niemann-Pick C disease; Phosphatidylglycerol.

This article demonstrate that NPC1-independent cholesterol egress in PG/LBPA enriched cells occurs, at least in part, via increased exosomal secretion. We probed Western blots of exosome-enriched preparations from the culture supernatants of untreated and PG-treated human primary NPC1 fibroblasts (GM03123), and found that 24 h PG treatment increased the amount of three classical exosomal markers, Alix, Flotillin-1, and CD63, in the exosome fraction by approx. 2- to 5-fold in FBS-free medium. Immunofluorescent imaging of luminal LAMP1, a marker of the endo-lysosomal compartment, in non-permeabilized NPC1 mutant fibroblasts, revealed a 6 to 10-fold increase in LAMP1-pos. organelles near the cell surface at 3 and 6 h of PG incubation, suggesting their exocytosis at early time points after treatment. We also found that the amount of cholesterol is reduced in exosomes released from cells that were first pretreated with GW4869 for 12 h and then incubated with PG in the presence of GW4869 for an addnl. 24 h, relative to cells incubated with PG but not treated with the compound Increase in C18:1,22:6 LBPA species in PG-treated cells may contribute to the formation of ILV, leading to increased exosome secretion and, hence, increased cholesterol secretion. The author concluded that PG treatment of NPC1 deficient cells leads to a reduction in LE/LY cholesterol accumulation, at least in part via exosomal egress.

Biochimica et Biophysica Acta, Molecular and Cell Biology of Lipids published new progress about Animal gene Role: BSU (Biological Study, Unclassified), BIOL (Biological Study) (Alix). 6823-69-4 belongs to class imidazoles-derivatives, and the molecular formula is C30H30Cl2N6O2, Recommanded Product: p-Benzenediacrylanilide, 4′,4′′-di-2-imidazolin-2-yl-, dihydrochloride.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Kimura, Satoshi; Fujisaka, Aki; Obika, Satoshi published the artcile< Nucleobase derivatives induce in-source decay of oligonucleotides as new matrix-assisted laser desorption/ionization matrices>, Product Details of C5H5N5, the main research area is nucleobase derivative oligonucleotide decay MALDITOF mass spectrometry.

Rationale : For quality control of oligonucleotide therapeutics, accurate and efficient structural characterization using mass spectrometry techniques, such as liquid chromatog./mass spectrometry (LC/MS) and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), is essential. In MALDI MS anal., matrix selection is critical and a new matrix could enable more efficient and rapid structural anal. Methods : We hypothesized that nucleobase derivatives could act as matrixes more efficiently than the currently used matrixes for oligonucleotides because of structural similarity, which leads to close contact with the analyte. To evaluate their suitability as matrixes, 16 nucleobase derivatives were selected and tested as matrix candidates for oligonucleotide anal. Results : Six of the 16 nucleobase derivatives acted as matrixes for oligonucleotides. Particularly, 6-thioguanine (TG) performed well and induced clear in-source decay fragmentation. When TG or 2-amino-6-chloropurine was used as the matrix, oligonucleotides were ionized, and mainly the w and d fragment ions were observed Conclusions : Herein we demonstrate that a 10-mer RNA or DNA sequence can be successfully characterized using TG as matrix and suggest the possibility of using nucleobase derivatives as novel matrixes in oligonucleotide sequencing.

Rapid Communications in Mass Spectrometry published new progress about DNA Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study) (6-mer, 10-mer, phosphorothioate 6-mer). 452-06-2 belongs to class imidazoles-derivatives, and the molecular formula is C5H5N5, Product Details of C5H5N5.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Shi, Qin; Wang, Di; Ding, Xiaoying; Yang, Xiaoqing; Zhang, Yuquan published the artcile< Exosome-shuttled miR-7162-3p from human umbilical cord derived mesenchymal stem cells repair endometrial stromal cell injury by restricting APOL6>, Recommanded Product: p-Benzenediacrylanilide, 4′,4′′-di-2-imidazolin-2-yl-, dihydrochloride, the main research area is microRNA APOL exosome UCMSC endometrial stromal cell injury human; Endometrial injury; Exosome; Human umbilical cord mesenchymal stem cell; Repair; miR-7162-3p.

Recent studies have shown that exosomes (Exos) derived from stem cells can be used as paracrine factors to regenerate cells and tissues via shuttling miRNAs. Exos derived from human umbilical cord derived mesenchymal stem cells (UCMSCs) have been found to alleviate mifepristone-induced endometrial stromal cell (ESC) injury in vitro. Information on the functions and mechanisms of Exos from UCMSC-induced endometrial repair is limited and requires more study. UCMSC-Exos were isolated and identified by Transmission Electron Microscopy, Nanoparticle Tracking Anal. software, and western blot assays. The damaged-ESC model and the UCMSC co-culture system were established, while GW4869, a noncompetitive neutral sphingomyelinase (N-SMase) inhibitor, was used to investigate the effects of UCMSC-Exos on mifepristone-induced ESC injury. Cell apoptosis of damaged ESCs treated with UCMSCs was detected using the TUNEL assay and flow cytometry anal. Then, miRNA microarrays were performed to detect differentially expressed miRNA profiles in both UCMSCs and ESCs after coculturing. A subset of upregulated miRNAs was validated by qRT-PCR, and miRNA mimics/inhibitor were used to investigate the functions of miR-7162-3p. The miRNA-mRNA interactions were predicted by Targetscan software, while the miRNA binding sites were predicted by miRcode software. Moreover, dual-luciferase reporter, western blot assays and qPCR were conducted to identify the regulatory mechanisms between miR-7162- 3p and APOL6. UCMSCs attenuated mifepristone-induced endometrial stromal cell apoptosis by Exos, while three miRNAs (miR-6831-5p, miR-4669, and miR-7162-3p) were both upregulated in UCMSCs and ESCs after coculture, and were candidate effectors of UCMSC-Exos-mediated endometrial repair. We showed that miR7162-3p was shuttled by Exos from UCMSCs and regulated the expression of APOL6 by targeting its 3′-UTR in ESCs. These results showed UCMSC-Exos protected ESCs from mifepristone-induced apoptosis and played an active role in repairing the damaged ESCs by in vitro shuttling of miR-7162-3p. The miR-7162-3p overexpressed UCMSC-Exos may therefore be used in cell-free therapy of endometrial injury.

Archives of Biochemistry and Biophysics published new progress about 3′-Untranslated region Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 6823-69-4 belongs to class imidazoles-derivatives, and the molecular formula is C30H30Cl2N6O2, Recommanded Product: p-Benzenediacrylanilide, 4′,4′′-di-2-imidazolin-2-yl-, dihydrochloride.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Tavakoli Dargani, Zahra; Singla, Reetu; Johnson, Taylor; Kukreja, Rakesh; Singla, Dinender K. published the artcile< Exosomes derived from embryonic stem cells inhibit doxorubicin and inflammation-induced pyroptosis in muscle cells>, Synthetic Route of 6823-69-4, the main research area is muscle exosome embryonic stem cell doxorubicin inflammation pyroptosis; doxorubicin; doxorubicine; inflammation; muscle; pyroptose; pyroptosis.

Doxorubicin (Dox) is an effective anticancer drug. Unfortunately, it causes cardiac and muscle toxicity due to increased oxidative stress and inflammation; however, it remains unknown whether Dox induces “”pyroptosis”” – an inflammation-mediated cell death. We investigated whether Dox induces pyroptosis in mouse soleus muscle (Sol 8) cells in vitro and to show the protective effect of embryonic stem cell exosomes (ES-exos) on pyroptosis. Dox and inflammation-induced in vitro model was generated. Pyroptosis was confirmed using immunohistochem. (with putative markers caspase-1, IL-1β, and pro-inflammatory cytokine IL-18) and Western blotting of caspase-1 and IL-1β. The results show significant increase in the expression of caspase-1, IL-1β, and IL-18 following treatment with Dox, which was inhibited by ES-exos but not mouse embryonic fibroblast exosomes. Moreover, GW4869 compound inhibited functional activity of ES-exos, suggesting these vesicles are key players in the inhibition of pyroptosis. These results suggest that Dox induces inflammatory pyroptosis in Sol 8 cells, which is attenuated by ES-exos in vitro.

Canadian Journal of Physiology and Pharmacology published new progress about Embryonic fibroblast. 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

Salerno, Domenico; Marrano, Claudia Adriana; Cassina, Valeria; Cristofalo, Matteo; Shao, Qing; Finzi, Laura; Mantegazza, Francesco; Dunlap, David published the artcile< Nanomechanics of negatively supercoiled diaminopurine-substituted DNA>, Related Products of 452-06-2, the main research area is diaminopurine DNA conformation nanomechanics.

Single mol. experiments have demonstrated a progressive transition from a B- to an L-form helix as DNA is gently stretched and progressively unwound. The particular sequence of a DNA segment defines both base stacking and hydrogen bonding that affect the partitioning and conformations of the two phases. Naturally or artificially modified bases alter H-bonds and base stacking and DNA with diaminopurine (DAP) replacing adenine was synthesized to produce linear fragments with triply hydrogen-bonded DAP:T base pairs. Both unmodified and DAP-substituted DNA transitioned from a B- to an L-helix under physiol. conditions of mild tension and unwinding. This transition avoids writhing and the ease of this transition may prevent cumbersome topol. rearrangements in genomic DNA that would require topoisomerase activity to resolve. L-DNA displayed about tenfold lower persistence length than B-DNA. However, left-handed DAP-substituted DNA was twice as stiff as unmodified L-DNA. Unmodified DNA and DAP-substituted DNA have very distinct mech. characteristics at physiol. levels of neg. supercoiling and tension.

Nucleic Acids Research published new progress about Electrostatic potential. 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