1. Hydrogen sulphide (H₂S), one of three signalling gasotransmitters, plays an important role in oxidative stress and apoptosis. However, the effects of H₂S on oxidative stress-induced apoptosis in focal cerebral ischaemic injury in rats have not been clarified. 2. In the present study, sodium hydrosulphide (NaHS) was used as the H₂S donor. Eighty-four Sprague-Dawley rats were randomly divided into six groups: sham, sham + low-dose (2.8 mg/kg) NaHS, sham + high-dose (11.2 mg/kg) NaHS, infarct, infarct + low-dose NaHS and infarct + high-dose NaHS. The focal cerebral ischaemic model was created by cranially inserting a nylon thread with a rounded tip into an internal carotid artery. Rats were killed 21 h after administration of NaHS. 3. In the infarct + low-dose NaHS compared with infarct group, infarct volume was significantly decreased and injury to the mitochondria in nerve cells was mitigated. Furthermore, significant increases were seen in mitochondrial superoxide dismutase and glutathione peroxidase activity and neuronal bcl-2 protein levels, whereas mitochondrial malondialdehyde content and neuronal bax and caspase 3 protein levels were significantly decreased, in the infarct + low-dose NaHS compared with infarct group. The effects seen in the infarct group were significantly aggravated in the infarct + high-dose NaHS group. 4. The findings of the present study provide novel evidence for the dual effects of H₂S on focal cerebral ischaemic injury via modulation of oxidative stress-induced apoptosis.
Reaction of the rigid ligand 2,4,5,6-tetrachloro-1,3-benzenedicarboxylic acid (1,3-H 2 BDC-Cl 4 ) with copper(II) nitrate in different solvent systems afforded two new complexes (2), which were fully characterized by elemental analysis, IR spectroscopy, as well as single crystal and powder Xray diffiraction techniques. Single-crystal X-ray diffraction reveals that complexes 1 and 2 crystallize in different space groups P2 1 /m and Pbca, respectivly. Compound 1 shows a two-dimensional (2D) (4,6)connected layered network constructed by the connectivity between one-dimensional (1D) [-Cu-DMF-COO-] n chains and tetrachlorinated
In the title compound, C18H12F4N2S2, a bis-thiophenyl Schiff base ligand with a perifluorinated aromatic core, the complete molecule is generated by crystallographic inversion symmetry. The thiophene and tetrafluorinated benzene rings are oriented at a dihedral angle of 77.38 (4)°. The crystal structure exhibits C—H⋯F hydrogen bonds, resulting in supramolecular chains along the c-axis direction.
The title compound, C20H16F4N2S2, is a flexible bisthiophene-type Schiff base ligand with a perfluorinated backbone. The terminal thiophene rings are almost normal to one another with a dihedral angle of 83.8 (2)°, and they are tilted to the central tetrafluorinated benzene ring with dihedral angles of 61.2 (2) and 77.7 (1)°. In the crystal, there are π–π interactions involving the benzene ring and the thiophene ring of a symmetry-related molecule with a centroid–centroid separation of 3.699 (3) Å.
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