作者: Lockridge, Oksana ; Dafferner, Alicia J. ; Johnson, Rudolph C. ; Cashman, John R. ; Blake, Thomas A. ; Xiao, Gaoping ; Yerramalla, Udaya ; Schopfer, Lawrence M.

Nerve agents and organophosphorus pesticides make a covalent bond with the active site serine of acetylcholinesterase (AChE), resulting in inhibition of AChE activity and toxic symptoms. AChE in red blood cells (RBCs) serves as a surrogate for AChE in the nervous system. Mass spectrometry analysis of adducts on RBC AChE could provide evidence of exposure. Our goal was to develop a method of immunopurifying human RBC AChE in quantities adequate for detecting exposure by mass spectrometry. For this purpose, we immobilized 3 commercially available anti-human acetylcholinesterase monoclonal antibodies (AE-1, AE-2, and HR2) plus 3 new monoclonal antibodies. The monoclonal antibodies were characterized for binding affinity, epitope mapping by pairing analysis, and nucleotide and amino acid sequences. AChE was solubilized from frozen RBCs with 1% (v/v) Triton X-100. A 16 mL sample containing 5.8 μg of RBC AChE was treated with a quantity of soman model compound that inhibited 50% of the AChE activity. Native and soman-inhibited RBC AChE samples were immunopurified on antibody-Sepharose beads. The immunopurified RBC AChE was digested with pepsin and analyzed by liquid chromatography tandem mass spectrometry on a 6600 Triple-TOF mass spectrometer. The aged soman-modified PheGlyGluSerAlaGlyAlaAlaSer (FGESAGAAS) peptide was detected using a targeted analysis method. It was concluded that all 6 monoclonal antibodies could be used to immunopurify RBC AChE and that exposure to nerve agents could be detected as adducts on the active site serine of RBC AChE.

2013-01-01·European Journal of Pharmacology3区 · 医学

In vivo profile of the anticoagulant effect of 17ß-amino-1,3,5(10)estratrien-3-ol

3区 · 医学

Article

作者: María Estela Avila ; Ana Elena Lemus ; Martha Medina ; Cristina Lemini ; Yanira Franco ; Ruth Jaimez ; Consuelo Rubio-Póo

The anticoagulant activity of 17ß-amino-1,3,5(10)estratrien-3-ol (AE(2)) was established for the first time. Experiment 1: mice groups were treated with a single subcutaneous (s.c.) AE(2) injection (0.5, 1, 2, 4, and 8 mg/100 g BW) or vehicle (propylenglycol; 0.5 ml/100 g). After 24 h, AE(2) produced dose-dependent blood clotting time increases related to control, Emax=+121% (P<0.01) finishing the sixth day. Experiment 2: four groups received a single s.c. administration of AE(2) (4 or 8 mg/100g BW) or 17ß-estradiol (E(2); 3mg/100g BW) or vehicle. After 24 and 48 h post-administration, the times of blood clotting, prothrombin, thrombin, and activated partial thromboplastin and fibrinogen concentrations were assessed. Both AE(2) doses increased blood clotting and fibrinogen similarly, blood clotting time: 64, 94%; fibrinogen: 71, 107% (P<0.01). Prothrombin, activated partial thromboplastin and thrombin times, increased 13-15%, 27-55%, and 15-29%, respectively (P<0.01). Meanwhile E(2) decreased blood clotting 20% (P<0.01) and thrombin 23% (P<0.01) after 48 h. Experiment 3: for five consecutive days, mice received AE(2) or E(2) (0.1, 1, 10, 100, and 1000 μg/kg/day), or vehicle. Blood clotting time was assessed at 1, 2, 3, 4, 5, 8, and 11 days after treatment. AE(2) at all doses were anticoagulant for 2-3 days after administration whereas E(2) was procoagulant for 8-11 days. These opposite effects were: AE(2) Emax=+29%; E(2) Emax=-30%; (P<0.01). AE(2) is the parent compound of the 17ß-aminoestrogens, with the largest and longest anticoagulant effect until now reported.

2002-01-01·Pharmaceutical Research3区 · 医学

Transdermal delivery of highly lipophilic drugs: in vitro fluxes of antiestrogens, permeation enhancers, and solvents from liquid formulations.

3区 · 医学

Article

作者: Roman Schiller ; Clemens Günther ; Ralph Lipp ; Adrian P. Funke ; Hans W. Motzkus ; Rainer H. Müller

PURPOSEHighly lipophilic basic drugs, the antiestrogens AE 1 (log P = 5.82) and AE 2 (log P = 7.8) shall be delivered transdermally.METHODSTransdermal permeation of drugs, enhancers, and solvents from various fluid formulations were characterized by in-vitro permeation studies through excised skin of hairless mice. Furthermore, differential scanning calorimetry (DSC) measurements of skin lipid phase transition temperatures were conducted.RESULTSTransdermal flux of highly lipophilic drugs was extraordinarily enhanced by the unique permeation enhancer combination propylene glycol-lauric acid (9 + 1): steady-state fluxes of AE 1 and AE 2 were as high as 5.8 microg x cm(-2) x h(-1) and 3.2 microg x cm(-2) x h(-1), respectively. This dual enhancer formulation also resulted in a marked increase in the transdermal fluxes of the enhancers. Furthermore, skin lipid phase transition temperatures were significantly reduced by treatment with this formulation.CONCLUSIONTransdermal delivery of highly lipophilic drugs can be realized by using the permeation enhancer combination propylene glycol-lauric acid. The extraordinary permeation enhancement for highly lipophilic drugs by this formulation is due to mutual permeation enhancement of these two enhancers and their synergistic lipid-fluidising activity in the stratum corneum.

100 项与 AE-002 相关的药物交易

登录后查看更多信息