Recombinant Adeno-associated Viral Vectors Serotypes 6 and 9 are Able to Transduce Human Tracheal Epithelial Cells but Not Human Induced Pluripotent Stem Cells

Recombinant adeno-associated viruses (rAAVs) may be useful for the development of gene therapy for hereditary diseases. Patient-specific human induced pluripotent stem cells (hiPSCs) can be differentiated into a variety of cells which are difficult or impossible to obtain by biopsy. To date, few research on the efficiency of rAAV transduction of hiPSCs has been published, but the obtained data are very contradictory and do not answer the actual question: how effective are rAAVs for the delivery of transgenes into hiPSCs. In this work, we used rAAV serotypes 5, 6, and 9 carrying the GFP transgene. The transduction efficiency of rAAV2/9-GFP and rAAV2/6-GFP for the immortalized tracheal epithelial cell line derived from a patient with cystic fibrosis (CFTE29o-) was relatively high. At the same time, the efficiency of transduction of iPSCs from a healthy donor and a cystic fibrosis (CF) donor was extremely low. Thus, our results show that the efficiency of hiPSC transduction by rAAV serotypes 5, 6, and 9 is not suitable for the delivery of transgenes.

ANTIOXIDATIVE EFFICACY OF NEUROPROTECTIVE THERAPY IN PATIENTS WITH CHRONIC CEREBRAL ISCHEMIA

The aim of the research is to estimate the molecular and biochemical efficacy of Tiocetam administration to patients with ChCI, with regard of the state of glutathione system in plasma and of erythrocytes hemolysate. 60 patients with ChCI, averagely aged 54,70±7,71 years, were examined and divided into two groups of 30 people each, depending on the treatment regimen. The patients from the control group were intravenously administered infusions of Tiocetam with the dosage of 20 ml (for 10 days, then changed for Tiocetam forte (400 mg of Piracetam and 100 mg of Tiotriazoline) with the dosage of 1 pill thrice a day during 30 days. The patients of the experimental group were taking basic treatment, without administration of neuroprotective drugs. Concentration of renewed glutathione (RG) in blood plasma and erythrocytes hemolysate of patients was defined according to the reaction with ortho-phthalic anhydride; the contents of SH-group thioles in blood plasma, the activity of glutathione-dependent enzymes were defined spectrophotometrically. Treating patients with ChCI with Tiocetam has revealed probable (by Friedman test) decreased activity of glutathione transferase (GT) (p=0,003), and increased activity of glutathione reductase (GR) (p=0,002) and glutathione peroxidase (GPx) (p=0,002) in blood plasma, as well as decreased activity of GT (p=0,004), increased activity of GR (p=0,007) and GPx (p<0,001), as well as an increase of RG (p<0,001) in erythrocytes hemolysate of the patients with ChCI. Obtained results prove pathogenetically substantiated administration of Tiocetam for patients with ChCI, due to its positive impact on the condition of glutathione antioxidative system in blood plasma and erythrocytes hemolysate, by means of suppression of main mechanisms of oxidative stress, which make preconditions for clinical manifestations of ChCI.

Tuning the conductivity type in a room temperature magnetic oxide: Ni-doped Ga0.6Fe1.4O3 thin films

The mechanism responsible for conduction in pulsed laser deposited thin films of room temperature ferrimagnetic Ga_0.6Fe_1.4O₃ is fully elucidated. The conduction type can be tuned from n to p through doping with bivalent Ni ions.

Incorporation of cobalt ions into magnetoelectric gallium ferrite epitaxial films: tuning of conductivity and magnetization

Doping Ga0.6Fe1.4O3 thin films with magnetic Co²⁺ ions leads to a strong reduction in the charge conduction and does not lead to any modification of the ferrimagnetic transition. This is absolutely comparable to that observed with Mg-doping.

Antibody immobilisation on the metal and silicon surfaces. The use of self-assembled layers and specific receptors

The use of Staphylococcal protein A and lectins as intermediate immobilising agents allows operators to orient antibodies (Ab) towards the solution due to the presence of a specific binding sites of immunoglobulin (Ig) molecules. Antibodies of different species of animals have unequal affinities to individual lectins. The effective thickness of immobilised Ab's depends on the type of substrates used and increases in the following sequence: bare gold or silicon surface, the surface treated with self-assembled polyelectrolytes (PESA) or with protein A or some lectins deposited on the preliminary formed polyelectrolyte layer. The glycolysated protein of jp51 may be selectively immobilised from the mixture of retroviral proteins (p24 and jp51), if it is necessary to distinguish infected animals from preliminarily immunised ones by means of a vaccine based on p24 protein. It was shown that the use of Staphylococcal protein A, instead of some lectins as intermediate layer for the Ab immobilisation, does not lead to a more sensitive determination of such low-weight toxins as 2,4-dichlorophenoxyacetic acid (2,4-D). The above-mentioned results were obtained with surface plasmon resonance (SPR) technique.

Neutral fluorescence probe with strong ratiometric response to surface charge of phospholipid membranes

We report on dramatic differences in fluorescence spectra of 4'-dimethylamino-3-hydroxyflavone (probe F) studied in phospholipid membranes of different charge (phosphatidyl glycerol, phosphatidylcholine (PC), their mixture and the mixture of PC with a cationic lipid). The effect consists in variations of relative intensities at two well-separated band maxima at 520 and 570 nm belonging to normal (N*) and tautomer (T*) excited states of flavone chromophore. Based on these studies we propose a new approach to measure electrostatic potential at the surface layer of phospholipid membranes, which is based on potential-dependent changes of bilayer hydration and involves very sensitive and convenient ratiometric measurements in fluorescence emission.