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https://www.readbyqxmd.com/read/28428279/interaction-between-tumor-cell-surface-receptor-rage-and-proteinase-3-mediates-prostate-cancer-metastasis-to-bone
#1
Mikhail G Kolonin, Anna Sergeeva, Daniela I Staquicini, Tracey L Smith, Christy A Tarleton, Jeffrey J Molldrem, Richard L Sidman, Serena Marchiò, Renata Pasqualini, Wadih Arap
Human prostate cancer often metastasizes to bone, but the biological basis for such site-specific tropism remains largely unresolved. Recent work led us to hypothesize that this tropism may reflect pathogenic interactions between RAGE, a cell surface receptor expressed on malignant cells in advanced prostate cancer, and proteinase 3 (PR3), a serine protease present in inflammatory neutrophils and hematopoietic cells within the bone marrow microenvironment. In this study, we establish that RAGE-PR3 interaction mediates homing of prostate cancer cells to the bone marrow...
April 20, 2017: Cancer Research
https://www.readbyqxmd.com/read/28413238/formation-of-gold-iii-alkyls-from-gold-alkoxide-complexes
#2
Isabelle Chambrier, Dragoş-Adrian Roşca, Julio Fernandez-Cestau, David L Hughes, Peter H M Budzelaar, Manfred Bochmann
The gold(III) methoxide complex (C(∧)N(∧)C)AuOMe (1) reacts with tris(p-tolyl)phosphine in benzene at room temperature under O abstraction to give the methylgold product (C(∧)N(∧)C)AuMe (2) together with O=P(p-tol)3 ((C(∧)N(∧)C) = [2,6-(C6H3(t) Bu-4)2pyridine](2-)). Calculations show that this reaction is energetically favorable (ΔG = -32.3 kcal mol(-1)). The side products in this reaction, the Au(II) complex [Au(C(∧)N(∧)C)]2 (3) and the phosphorane (p-tol)3P(OMe)2, suggest that at least two reaction pathways may operate, including one involving (C(∧)N(∧)C)Au(•) radicals...
April 10, 2017: Organometallics
https://www.readbyqxmd.com/read/28406290/cooperative-catalysis-at-metal-sulfur-bonds
#3
Lukas Omann, C David F Königs, Hendrik F T Klare, Martin Oestreich
Cooperative catalysis has attracted tremendous attention in recent years, emerging as a key strategy for the development of novel atom-economic and environmentally more benign catalytic processes. In particular, Noyori-type complexes with metal-nitrogen bonds have been extensively studied and evolved as privileged catalysts in hydrogenation chemistry. In contrast, catalysts containing metal-sulfur bonds as the reactive site are out of the ordinary, despite their abundance in living systems, where they are assumed to play a key role in biologically relevant processes...
April 13, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28391334/complement-activation-in-pauci-immune-necrotizing-and-crescentic-glomerulonephritis-results-of-a-proteomic-analysis
#4
Sanjeev Sethi, Ladan Zand, An S De Vriese, Ulrich Specks, Julie A Vrana, Siddak Kanwar, Paul Kurtin, Jason D Theis, Andrea Angioi, Lynn Cornell, Fernando C Fervenza
Background: Complement activation plays an important role in the pathophysiology of anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV), although it remains unclear which pathway is activated. Whether pauci-immune necrotizing crescentic glomerulonephritis (pauci-immune GN) with negative ANCA serology is part of the spectrum of AAV or a different disease entity is essentially unknown. Methods: We used proteomic analysis to delineate the complement profile in a series of 13 kidney biopsies of patients with pauci-immune GN, with either proteinase 3 (PR3) (five patients) or myeloperoxidase (MPO) antibodies (four patients) or with consistently negative ANCA serology (four patients)...
January 1, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28368595/-fe4-and-fe6-hydride-clusters-supported-by-phosphines-synthesis-characterization-and-application-in-n2-reduction
#5
Ryoichi Araake, Kazuki Sakadani, Mizuki Tada, Yoichi Sakai, Yasuhiro Ohki
Multiple iron atoms bridged by hydrides is a common structural feature of the active species that have been postulated in the biological and industrial reduction of N2. In this study, the reactions of an Fe(II) amide complex with pinacolborane in the presence/absence of phosphines afforded a series of hydride-supported [Fe4] and [Fe6] clusters Fe4(μ-H)4(μ3-H)2{N(SiMe3)2}2(PR3)4 (PR3 = PMe3 (2a), PMe2Ph (2b), PEt3 (2c)), Fe6(μ-H)10(μ3-H)2(PMe3)10 (3), and (η(6)-C7H8)Fe4(μ-H)2{μ-N(SiMe3)2}2{N(SiMe3)2}2 (4), which were characterized crystallographically and spectroscopically...
April 10, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28361331/anca-associated-vasculitis-pathogenesis-a-commentary
#6
REVIEW
Eric J Gapud, Philip Seo, Brendan Antiochos
PURPOSE OF REVIEW: The ANCA-associated vasculitides are a group of small vessel vasculitides characterized by autoantibodies recognizing the neutrophil cytoplasmic antigens PR3 and MPO. We examine the current clinical and molecular immunology understanding of ANCA-associated vasculitides and discuss the current needs in our understanding of the pathogenic mechanisms of these rare diseases. RECENT FINDINGS: The majority of efforts to understand the pathogenesis of these diseases have focused on dissecting neutrophil biology because the neutrophil is the primary expressor of ANCA autoantigens...
April 2017: Current Rheumatology Reports
https://www.readbyqxmd.com/read/28339364/clinical-and-prognostic-features-of-korean-patients-with-mpo-anca-pr3-anca-and-anca-negative-vasculitis
#7
Juyoung Yoo, Ho Jae Kim, Sung Soo Ahn, Seung Min Jung, Jason Jungsik Song, Yong-Beom Park, Sang-Won Lee
OBJECTIVES: We reclassified Korean patients with antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) into 3 categories of AAV including MPO-ANCA, PR3-ANCA and ANCA negative vasculitis, and investigated clinical and prognostic features. METHODS: We reviewed the medical records of 133 patients with microscopic polyangiitis (MPA), granulomatosis with polyangiitis (GPA) and eosinophilic GPA (EGPA), who had having either myeloperoxidase (MPO)-ANCA, proteinase 3 (PR3)-ANCA or no ANCA, and who had ever achieved the first remission...
March 23, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28319294/activation-of-sf6-at-platinum-complexes-formation-of-sf3-derivatives-and-their-application-in-deoxyfluorination-reactions
#8
Claudia Berg, Thomas Braun, Mike Ahrens, Philipp Wittwer, Roy Herrmann
The activation of SF6 at [Pt(PR3 )2 ] R=Cy, iPr complexes in the presence of PR3 led selectively and in an unprecedented reaction route to the generation of the SF3 complexes trans-[Pt(F)(SF3 )(PR3 )2 ]. These can also be synthesized from SF4 and the SF2 derivative trans-[Pt(F)(SF2 )(PCy3 )2 ][BF4 ] was characterized by X-ray crystallography. trans-[Pt(F)(SF3 )(PR3 )2 ] complexes are useful tools for deoxyfluorination reactions and novel fluorido complexes bearing a SOF ligand are formed. Based on these studies a process for the deoxyfluorination of ketones was developed with SF6 as fluorinating agent...
April 3, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28291538/-pyoderma-gangrenosum-associated-with-anti-proteinase-3%C3%A2-antineutrophil-cytoplasmic-antibodies-pr3-anca-induced-by-propylthiouracil
#9
A Coster, J-L Dargent, N de Visscher, P Levecque, P-P Roquet-Gravy
BACKGROUND: Synthetic antithyroid drugs are often used in the treatment of hyperthyroidism, regardless of aetiology. They may cause various side effects, including the development of anti-neutrophil cytoplasmic antibodies (ANCA), ANCA-associated vasculitis, and neutrophilic dermatoses. Propylthiouracil (PTU) is the antithyroid drug most frequently implicated in ANCA-associated diseases specifically involving anti-myeloperoxidase ANCA (MPO-ANCA). To our knowledge, there are no clinical reports describing the association of pyoderma gangrenosum (PG) and anti-proteinase3-ANCA (PR3-ANCA) induced by PTU, with ANCA levels decreasing after antithyroid drug withdrawal...
March 10, 2017: Annales de Dermatologie et de Vénéréologie
https://www.readbyqxmd.com/read/28276554/1-8-bis-silylamido-naphthalene-complexes-of-magnesium-and-zinc-synthesised-through-alkane-elimination-reactions
#10
Mark A Bradley, Chris Birchall, Alexander J Blake, William Lewis, Graeme J Moxey, Deborah L Kays
The reactions between magnesium or zinc alkyls and 1,8-bis(triorganosilyl)diaminonaphthalenes afford the 1,8-bis(triorganosilyl)diamidonaphthalene complexes with elimination of alkanes. The reaction between 1,8-C10H6(NSiMePh2H)2 and one or two equivalents of Mg(n)Bu2 affords two complexes with differing coordination environments for the magnesium; the reaction between 1,8-C10H6(NSiMePh2H)2 and Mg(n)Bu2 in a 1 : 1 ratio affords 1,8-C10H6(NSiMePh2)2{Mg(THF)2} (1), which features a single magnesium centre bridging both ligand nitrogen donors, whilst treatment of 1,8-C10H6(NSiR3H)2 (R3 = MePh2, (i)Pr3) with two equivalents of Mg(n)Bu2 affords the bimetallic complexes 1,8-C10H6(NSiR3)2{(n)BuMg(THF)}2 (R3 = MePh22, R3 = (i)Pr33), which feature four-membered Mg2N2 rings...
March 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28266666/monodentate-phosphine-substitution-in-pd-%C3%AE%C2%BA-3-dppf-pr3-bf4-2-dppf-1-1-bis-diphenylphosphino-ferrocene-compounds
#11
K D Cabrera, A T Rowland, J M Szarko, P L Diaconescu, M W Bezpalko, W S Kassel, C Nataro
The ligand 1,1'-bis(diphenylphosphino)ferrocene (dppf) is commonly employed in a variety of catalytic systems. There are a variety of coordination modes known for dppf, the least studied being the κ(3) coordination mode, in which both phosphorus atoms and the iron atom of dppf interact with another metal center. One such compound is the previously reported [Pd(κ(3)-dppf)(PPh3)](2+). A series of related compounds, [Pd(κ(3)-dppf)(P(p-C6H4R)3)](2+) (R = OCH3, CH3, F and CF3), has been synthesized and characterized...
March 7, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28263574/mechanistic-studies-on-a-cooperative-nhc-organocatalysis-palladium-catalysis-system-uncovering-significant-lessons-for-mixed-chiral-pd-nhc-pr3-catalyst-design
#12
Chang Guo, Daniel Janssen-Müller, Mirco Fleige, Andreas Lerchen, Constantin G Daniliuc, Frank Glorius
A comprehensive investigation of the mechanism of the highly enantioselective Pd(PPh3)4/NHC-catalyzed annulation of vinyl benzoxazinanones and enals has been conducted. A study of reaction orders supports the postulated cooperative catalysis. Interestingly, a detailed investigation of the catalytically active palladium species pointed toward a dual role of the NHC acting as an organocatalyst and forming a novel mixed ligand Pd/NHC/phosphine complex. The catalytically active Pd/NHC/phosphine complex represents a new class of chiral palladium catalyst...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28261989/five-factor-score-more-than-1-is-associated-with-relapse-during-the-first-2-year-follow-up-in-patients-with-eosinophilic-granulomatosis-with-polyangiitis
#13
Dae Sik Kim, Jason Jungsik Song, Yong-Beom Park, Sang-Won Lee
AIM: We investigated what variables at diagnosis might be associated with the relapse of eosinophilic granulomatosis with polyangiitis (EGPA) and whether five factor score (FFS) at diagnosis might predict it. METHODS: We reviewed the medical records of 30 patients with EGPA having results of myeloperoxidase (MPO)-antineutrophil cytoplasmic antibodies (ANCA) and proteinase 3 (PR3)-ANCA and having achieved remission during the first therapeutic regimen administration within follow-up duration for at least more than 2 years...
March 5, 2017: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/28251013/antiproteinase-3-positive-eosinophilic-granulomatosis-with-polyangiitis-presenting-with-heart-failure-and-intraventricular-thrombosis
#14
Dan Zhu, Yiming Luo, Xiangyuan Liu, Lingyun Zu
Eosinophilic granulomatosis with polyangiitis (EGPA) is a rare systemic vasculitis commonly with cardiac complications. We describe a case of anti-PR3 ANCA-positive EGPA complicated by congestive heart failure and intraventricular thrombosis. Interestingly, the thrombus was resolved rapidly with steroid and cyclophosphamide in the setting of interrupted anticoagulation. To the best of our knowledge, we report the first case of anti-PR3 positive EGPA with extensive cardiac involvement. Our patient had overlapping features with previously studied ANCA-positive and ANCA-negative EGPA cases...
2017: Case Reports in Rheumatology
https://www.readbyqxmd.com/read/28240246/characterization-of-the-cd177-interaction-with-the-anca-antigen-proteinase-3
#15
Uwe Jerke, Stephen F Marino, Oliver Daumke, Ralph Kettritz
Proteinase 3 is a serine protease found in neutrophil granules and on the extracellular neutrophil membrane (mPR3). mPR3 is a major antigen for anti-neutrophil cytoplasmic antibodies (PR3-ANCAs), autoantibodies causing fatal autoimmune diseases. In most individuals, a subpopulation of neutrophils also produce CD177, proposed to present additional PR3 on the surface, resulting in CD177(neg)/mPR3(low) and CD177(pos)/mPR3(high) neutrophil subsets. A positive correlation has been shown between mPR3 abundance, disease incidence, and clinical outcome...
February 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28225490/clinical-characteristics-and-outcome-of-spanish-patients-with-anca-associated-vasculitides-impact-of-the-vasculitis-type-anca-specificity-and-treatment-on-mortality-and-morbidity
#16
MULTICENTER STUDY
Roser Solans-Laqué, Guadalupe Fraile, Monica Rodriguez-Carballeira, Luis Caminal, Maria J Castillo, Ferran Martínez-Valle, Luis Sáez, Juan J Rios, Xavier Solanich, Joaquim Oristrell, Francisco Pasquau, Eva Fonseca, Monica Zamora, Jose L Callejas, Begoña Frutos, Monica Abdilla, Patricia Fanlo, Isabel García-Sánchez, Miguel López-Dupla, Bernardo Sopeña, Almudena Pérez-Iglesias, Josep A Bosch
The aim of this study was to describe the clinical characteristics of ANCA-associated vasculitides (AAV) at presentation, in a wide cohort of Spanish patients, and to analyze the impact of the vasculitis type, ANCA specificity, prognostic factors, and treatments administered at diagnosis, in the outcome.A total of 450 patients diagnosed between January 1990 and January 2014 in 20 Hospitals from Spain were included. Altogether, 40.9% had granulomatosis with polyangiitis (GPA), 37.1% microscopic polyangiitis (MPA), and 22% eosinophilic granulomatosis with polyangiitis (EGPA)...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28220286/characteristics-of-hypertrophic-pachymeningitis-in-patients-with-granulomatosis-with-polyangiitis
#17
Hyun Ah Choi, Mi Ji Lee, Chin-Sang Chung
Hypertrophic pachymeningitis (HP) is an important neurologic complication of granulomatosis with polyangiitis (GPA, formerly Wegener's granulomatosis). The aim of this study is to investigate the clinical features, radiological findings, and diagnostic pitfalls of GPA-related HP. A retrospective chart review was performed to screen patients diagnosed with GPA at Samsung Medical Center between 1997 and 2016. Neurologic manifestation, laboratory findings, neuroimaging data, and clinical course were evaluated in all patients...
April 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28192517/neutrophils-and-neutrophil-serine-proteases-are-increased-in-the-spleens-of-estrogen-treated-c57bl-6-mice-and-several-strains-of-spontaneous-lupus-prone-mice
#18
Rujuan Dai, Catharine Cowan, Bettina Heid, Deena Khan, Zhihong Liang, Christine T N Pham, S Ansar Ahmed
Estrogen, a natural immunomodulator, regulates the development and function of diverse immune cell types. There is now renewed attention on neutrophils and neutrophil serine proteases (NSPs) such as neutrophil elastase (NE), proteinase 3 (PR3), and cathepsin G (CG) in inflammation and autoimmunity. In this study, we found that although estrogen treatment significantly reduced total splenocytes number, it markedly increased the splenic neutrophil absolute numbers in estrogen-treated C57BL/6 (B6) mice when compared to placebo controls...
2017: PloS One
https://www.readbyqxmd.com/read/28172776/p291-proteinase-3-antineutrophil-cytoplasmic-antibodies-pr3-anca-would-be-a-predictive-biomarker-for-the-clinical-course-of-ulcerative-colitis
#19
M Sono, T Yoshino, S Yazumi
No abstract text is available yet for this article.
February 1, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28169190/galactosylation-and-sialylation-levels-of-igg-predict-relapse-in-patients-with-pr3-anca-associated-vasculitis
#20
Michael J Kemna, Rosina Plomp, Pieter van Paassen, Carolien A M Koeleman, Bas C Jansen, Jan G M C Damoiseaux, Jan Willem Cohen Tervaert, Manfred Wuhrer
OBJECTIVE: The objective of our study is to investigate the Fc glycosylation profiles of both antigen-specific IgG targeted against proteinase 3 (PR3-ANCA) and total IgG as prognostic markers of relapse in patients with Granulomatosis with Polyangiitis (GPA). METHODS: Seventy-five patients with GPA and a PR3-ANCA rise during follow-up were included, of whom 43 patients relapsed within a median period of 8 (2-16) months. The N-glycan at Asn297 of affinity-purified and denatured total IgG and PR3-ANCA was determined by mass spectrometry of glycopeptides in samples obtained at the time of the PR3-ANCA rise and at the time of the relapse or time-matched during remission...
March 2017: EBioMedicine
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