Mesoporous silica nanoparticles SBA-15 loaded with emodin upregulate the antioxidative defense of Euproctis chrysorrhoea (L.) larvae

The study presented here aims to elucidate the effects of emodin (EO = 1,3,8-trihydroxy-6-methylanthraquinone) in its free form and when loaded into a mesoporous silica nanocarrier SBA-15 (→ SBA-15|EO) on the activities of the main antioxidative enzymes, superoxide dismutase, catalase, glutathione S-transferase, and glutathione reductase, in larvae of a polyphagous insect pest, the browntail moth Euproctis chrysorrhoea (L.). The results show that only SBA-15|EO upregulates the activities of the tested antioxidative enzymes. These results point to significant differences in the effectiveness of the compound in the free versus the loaded form

Ti-SLActive and TiZr-SLActive Dental Implant Surfaces Promote Fast Osteoblast Differentiation

A primary goal in modern surface modification technology of dental implants is to achieve biocompatible surfaces with rapid but controlled healing which also allow health and longevity of implants. In order to realize all, understanding of osseointegration phenomena is crucial. Although Ti-SLA, Ti-SLActive and TiZr-SLActive surfaces have been successfully used in clinical implantology and were shown to notably reduce the primary healing time, available in vitro studies are sparse and do not concern or explore the mechanism(s) involved in human osteoblast behavior on these surfaces. Ti-SLA, Ti-SLActive, TiZr-SLActive, Ti cp, Ticer and Cercon surfaces were used. Osteoblast proliferation, cell cluster formation, morphological changes, induction of autophagy, nitric oxide (NO), reactive oxygen species/reactive nitrogen species (ROS/RNS) formation, osteocalcin (OC), bone sialoprotein (BSP) and collagen type I (Col-1) affected by various surfaces were analyzed. These surfaces induced formation of mature osteoblasts caused by elevated oxidative stress (ROS) followed by overexpression of osteoblast maturation key molecule (NO), with different intensity however. These mature osteoblasts induced upregulation of OC, BSP and Col-1, activating PI3/Akt signalling pathway resulting in autophagy, known as an important process in differentiation of osteoblast cells. Additional distinctive subpopulation identified on Ticer, Ti-SLA (after 5 days), Ti-SLActive and TiZr-SLActive surfaces (after 2 days) were forming cell clusters, essential for bone noduli formation and mineralisation. The results suggest that Ti- and TiZr-SLActive possess advanced properties in comparison with Ticer and Ti-SLA manifested as accelerated osteoblast differentiation. These effects could explain already known fast osseointegration of these surfaces in vivo

SBA-15 mesoporous silica particles loaded with cisplatin induce senescence in B16F10 cells

The anticancer drug cisplatin (CP) is loaded into SBA-15 mesoporous silica (SBA-15 vertical bar CP) and its release from the nanomaterial is studied. The CP-loaded SBA-15 is tested against four tumor cell lines: mouse malignant melanoma B16F10, human adenocarcinoma HeLa, colon HT-29 and prostate PC3. Most importantly, the superiority of this novel material in comparison to CP arises from the fact that the CP-grafted nanomaterial SBA-15 (-> SBA-15 vertical bar CP) is enhancing cessation of proliferation along with induction of senescence in B16F10 in approximately 3.5 times lower concentration. The control material loaded with therapeutically inactive K-2[PtCl4] (-> SBA-15 vertical bar TC) showed no antitumor activity. To a large extent, SBA15| CP-induced senescence might present a safe approach in tumor treatment. Such cells can be cleared by immune cells resulting in efficient tumor regression. So far only apoptotic agents are being exploited in clinics, thus an understanding of the chemotherapeutic-induced senescence will allow oncologists to explore this essential tumor suppressor mechanism

Traceable platinum(II) complexes with alkylene diamine-derived ligands: synthesis, characterization and <i>in vitro</i> studies

<p>Diiodido- (<b>6a</b>/<b>6b</b>) and dichloridoplatinum(II) complexes (<b>7a</b>/<b>7b</b>) with fluorescent ligands 2-[(2-aminoethyl)amino]ethyl-2-(methylamino)benzoate (<b>5a</b>) and 2-amino-1-(aminoethyl)ethyl-2-(methylamino)benzoate (<b>5b</b>) were prepared and characterized by elemental analysis, ESI-MS analysis, fluorescence spectrometry, as well as ¹H, ¹³C, and ¹⁹⁵Pt NMR spectroscopy. All compounds have been tested against A2780 ovarian cancer, A549 lung carcinoma, and HT-29 colon cancer cell lines using sulforhodamine-B assay. The activity increased from ligand precursors, diiodido- to dichloridoplatinum(II) complexes, except against HT-29 cell line where diiodido and dichlorido expressed similar activity. These compounds enter the tumor cells and emit a bright fluorescence at <i>ca.</i> 470 nm, mainly targeting nuclei.</p

Synthesis and spectroscopic properties of large single-crystals of Pb(II), Hg(II) and Sr(II) methanesulfonato 1D coordination polymers

Three new 1D coordination polymers, [Pb-2(CH3SO3)(4)(H2O)(2)](n), [Hg(CH3SO3)(2)(H2O)(2)](n) and [Sr(CH3SO3)(2)(H2O)](n), were synthesized as large single crystals. The crystals were analyzed and characterized by the means of X-ray analysis, IR and NMR spectroscopy, elemental analysis and solid state UV-Vis spectroscopy. The formation of 1D polymeric chains in the crystal structures of the title compounds is affected by the various bonding modes of the bridging methanesulfonate groups. The studied compounds showed no decomposition in the air. (C) 2014 Elsevier Ltd. All rights reserved

Improved in vitro antitumor potential of (O,O'-Diisobutyl-ethylenediamine-N,N'-di-3-propionate)tetrachloridoplati num(IV) complex under normoxic and hypoxic conditions

(O,O'-Diisobutyl-ethylenediamine-N,N'-di-3-propionate)tetrachloridoplati num(IV), {[}PtCl4(iBu(2)eddp)]. shows an improved pharmacological profile in comparison to cisplatin. This is manifested through accelerated dying process led by necrotic cell death, reflected through mitochondrial collapse, strong ATP depletion and reactive oxygen species production. Loss of mitochondrial potential was further followed with intensive apoptosis that finalized with DNA fragmentation. Different dynamic of tumoricidal action could be partly ascribed to less affected repair mechanisms in comparison to cisplatin. Importantly, {[}PtCl4(iBu(2)eddp)] did not induce necrosis in primary fibroblasts suggesting different intracellular response of normal vs. tumor cells. This selectivity toward malignant phenotype is further confirmed by retained tumoricidal potential in hypoxic conditions, while cisplatin became completely inefficient. (C) 2015 Published by Elsevier B.V.Ministry of Science and Technological Development of the Republic of Serbia {[}173013, 173020, 172035]; SMWK {[}33707045]; SAB (ESF) {[}100147954]; Free State of Saxony {[}100099597