Evaluation of carboxylic acid-derivatized corroles as novel gram-positive antibacterial agents under non-photodynamic inactivation conditions.

Herein, we report the synthesis and evaluation of carboxylic acid corroles bearing either one, two, three of four carboxylic groups as gram-positive antibacterial agents against two strains of S. aureus, one methicillin-sensible (MSSA) and the other methicillin-resistant (MRSA). Lead compounds 5 and 6 show low minimum inhibitory concentrations (MICs) of 0.

Solvent and Anion Effects on the Electrochemistry of Manganese Dipyrrin-Bisphenols.

A series of "NO-type" manganese dipyrrin-bisphenols (DPP), formulated as (Ar)DPPMn, where Ar = pentafluorophenyl (FPh), phenyl (Ph), or mesityl (Mes), were electrochemically and spectroscopically characterized in nonaqueous media with and without added anions in the form of tetrabutylammonium salts (TBAX where X = ClO, PF, BF, F, Cl, OH, or CN). Two major one-electron reductions are observed under most solution conditions, the first of which is assigned as a Mn process and the second as electron addition to the π-ring system as confirmed by spectroelectrochemistry. Each Mn complex also exhibits one or two one-electron oxidations, the exact number depending upon the positive potential limit of the electrochemical solvent.

Ligand Noninnocence in Cobalt Dipyrrin-Bisphenols: Spectroscopic, Electrochemical, and Theoretical Insights Indicating an Emerging Analogy with Corroles.

Three cobalt dipyrrin-bisphenol (DPPCo) complexes with different meso-aryl groups (pentafluorophenyl, phenyl, and mesityl) were synthesized and characterized based on their electrochemistry and spectroscopic properties in nonaqueous media. Each DPPCo undergoes multiple oxidations and reductions with the potentials, reversibility, and number of processes depending on the specific solution conditions, the specific macrocyclic substituents, and the type and number of axially coordinated ligands on the central cobalt ion. Theoretical calculations of the compounds with different coordination numbers are given in the current study in order to elucidate the cobalt-ion oxidation state and the innocence or noninnocence of the macrocyclic ligand as a function of the changes in the solvent properties and degree of axial coordination.

Easy access to heterobimetallic complexes for medical imaging applications via microwave-enhanced cycloaddition.

The Cu(I)-catalysed Huisgen cycloaddition, known as "click" reaction, has been applied to the synthesis of a range of triazole-linked porphyrin/corrole to DOTA/NOTA derivatives. Microwave irradiation significantly accelerates the reaction. The synthesis of heterobimetallic complexes was easily achieved in up to 60% isolated yield.

Inhibitory action of NoxA1 on dual oxidase activity in airway cells.

Imbalance between pro- and antioxidant mechanisms in the lungs can compromise pulmonary functions, including blood oxygenation, host defense, and maintenance of an anti-inflammatory environment. Thus, tight regulatory control of reactive oxygen species is critical for proper lung function. Increasing evidence supports a role for the NADPH oxidase dual oxidase (Duox) as an important source for regulated H2O2 production in the respiratory tract epithelium.

Cross-talk between IRAK-4 and the NADPH oxidase.

Exposure of neutrophils to LPS (lipopolysaccharide) triggers their oxidative response. However, the relationship between the signalling downstream of TLR4 (Toll-like receptor 4) after LPS stimulation and the activation of the oxidase remains elusive. Phosphorylation of the cytosolic factor p47phox is essential for activation of the NADPH oxidase.

Akt regulates the subcellular localization of the Rab27a-binding protein JFC1 by phosphorylation.

Here, we show that the Rab27a-binding protein JFC1/Slp1 (synaptotagmin-like protein) is regulated by Akt-mediated phosphorylation. Using the phosphatase and tensin homolog-null LNCaP cells and the phosphatidylinositol 3-kinase inhibitor LY294002, we show that the phosphorylation of endogenous JFC1 is dependent on the phosphatidylinositol 3-kinase/Akt pathway. JFC1 was phosphorylated in cells expressing a constitutively active Akt, confirming that it is an Akt substrate in vivo.

Interleukin 17, a nitric oxide-producing cytokine with a peroxynitrite-independent inhibitory effect on proteoglycan synthesis.

Objective: To compare the potency of 2 cytokines, interleukin 17 (IL-17) and IL-1beta, on rat cartilage proteoglycan synthesis with special attention to nitric oxide (NO) and peroxynitrite formation.

Methods: Chondrocytes in alginate beads were stimulated with human recombinant (rh) IL-17 (0.03 to 300.