Effects of mitochondria-targeted plastoquinone derivative antioxidant (SkQ1) on demography of free-breeding Campbell dwarf hamsters (Phodopus campbelli) kept in outdoor conditions. Reproduction and lifespan: Explanation in the framework of ultimate loads
Rogovin K.A.,RAS Severtsov Institute of Ecology |
Khrushcheva A.M.,RAS Severtsov Institute of Ecology |
Shekarova O.N.,RAS Severtsov Institute of Ecology |
Ushakova M.V.,RAS Severtsov Institute of Ecology |
And 3 more authors.
Biochemistry (Moscow) | Year: 2014
We studied demographic effects of the mitochondria-targeted antioxidant SkQ1 on free-breeding Campbell dwarf hamsters (Phodopus campbelli, Thomas, 1905, Rodentia, Cricetidae) in an outdoor vivarium with seasonally varying day length and temperatures. The animals were kept in pairs from their young age. We removed litters from parental cages at their age of 25 days. Experimental hamsters received daily 50 nmol/kg SkQ1 with water by oral dosing, whereas control animals received water. SkQ1 had no effect on the lifespan of either males or females in reproductive pairs. Mortality among females was higher than among males irrespective of SkQ1 treatment, this being related to higher costs of reproduction in females. However, SkQ1 accelerated breeding in pairs in the first half of the reproductive period of a year. Although there were no statistical differences in body mass of males and females between experimental and control animals during most of their life, SkQ1-receiving males had higher body mass at the end of their life. The opposite tendency was characteristic for old females. One-year-old males and females of the experimental and control groups showed no difference in intensity of immune response to sheep red blood cells. The dermal hypersensitivity response to phytohemagglutinin (test for T-cell immunity) was significantly higher in SkQ1-treated 1- and 1.5-year-old males. This was not true for females. There was a tendency toward increased density of the neutrophil population in blood in 1-year-old SkQ1-treated males. However, experimental males showed no difference from control males in the activity of the "peroxidase-endogenous hydrogen peroxide system" of neutrophils. The background level of stress estimated by the concentration of cortisol in blood serum was significantly lower in the SkQ1-treated males during autumn adaptive adjustment of the organism. A similar trend was also observed during the January frosts, when the background level of stress was rather high. We observed no differences between cortisol concentration in experimental and control animals during the reproductive period in early spring and mid-summer. We tend to interpret the absence of geroprotective effect of SkQ1 on free-breeding dwarf hamsters by its ability to intensify breeding. We previously demonstrated the ability of SkQ1 to increase the lifespan of non-breeding females. © Pleiades Publishing, Ltd., 2014.
Komlev V.S.,RAS Institute of Metallurgy |
Barinov S.M.,RAS Institute of Metallurgy |
Bozo I.I.,Human Stem Cells Institute |
Deev R.V.,Human Stem Cells Institute |
And 11 more authors.
ACS Applied Materials and Interfaces | Year: 2014
Bioceramics are used to treat bone defects but in general do not induce formation of new bone, which is essential for regeneration process. Many aspects related to bioceramics synthesis, properties and biological response that are still unknown and, there is a great need for further development. In the most recent research efforts were aimed on creation of materials from biological precursors of apatite formation in humans. One possible precursor is octacalcium phosphate (OCP), which is believed to not only exhibit osteoconductivity but possess osteoinductive quality, the ability to induce bone formation. Here we propose a relatively simple route for OCP ceramics preparation with a specifically designed microstructure. Comprehensive study for OCP ceramics including biodegradation, osteogenic properties in ortopic and heterotopic models and limited clinical trials were performed that demonstrated enhanced biological behavior. Our results provide a possible new concept for the clinical applications of OCP ceramics. © 2014 American Chemical Society.
Pliyev B.K.,Institute of Immunology |
Shepelev A.V.,National Hematology Research Center |
Ivanova A.V.,Institute of Immunology
European Journal of Haematology | Year: 2013
The interaction of platelets with neutrophils plays an important role in inflammation and thrombosis and is coordinated by multiple adhesive interactions. The adhesion molecule CD99 is a key mediator of neutrophil migration across the endothelium but whether it is involved in platelet-neutrophil adhesive interactions has not previously been addressed. We found that platelet CD99 is predominantly localized on the cell surface and is not shed following platelet activation. Blocking of either platelet or neutrophil CD99 significantly diminished neutrophil migration across surface-adherent activated platelets in a quantitatively equivalent manner. In contrast, the blocking of CD99 affected neither neutrophil adhesion to surface-adherent activated platelets nor formation of circulating platelet-neutrophil conjugates. Thus, homophilic CD99 interaction mediates neutrophil transplatelet migration but is not involved or is redundant in neutrophil adhesion to surface-adherent or circulating platelets. © 2013 John Wiley & Sons A/S.
Galstyan G.,National Hematology Research Center |
Bychinin M.,National Hematology Research Center |
Alexanyan M.,National Hematology Research Center |
Gorodetsky V.,National Hematology Research Center
Intensive Care Medicine | Year: 2010
Purpose: To compare cardiac output (CO) and blood volumes measured by COstatus® (Transonic Systems Inc., NY, USA) versus PiCCO (Philips IntelliVue MP40 with PiCCO-technology module M3012A#10, Netherlands) in adult ICU patients. Methods: This was a prospective single-center study. Each of the 30 patients studied received a 5-Fr Pulsiocath femoral arterial and a standard central venous catheter. Twenty ml of iced 5% dextrose solution was injected for PiCCO measurements. For COstatus measurements, an extracorporeal arteriovenous loop, with two sensors placed on it, was connected between the Pulsiocath femoral arterial and central venous catheters. Blood was circulated through this loop at 12 ml/min for 5-8 min using a pump. Twenty ml of warm saline was injected into the venous side for measurements. For each method, three injections were averaged for comparison. Results: A good agreement for measured CO (range 3.65-16.3 l/min) with a percentage error of 20% was observed, with r = 0.95, bias = -0.037 l/min. PiCCO's global end-diastolic volume (GEDV) was 2.5 times larger than the analogous COstatus's total end-diastolic volume (TEDV) [TEDV = 0.28 × GEDV + 176 ml]. PiCCO's intrathoracic blood volume (ITBV) was larger than the analogous COstatus's central blood volume (CBV) [CBV = 0.73 × (ITBV) +78 ml]. Conclusions: CO measured by COstatus was found to be equivalent and hence interchangeable with PiCCO in this study population. COstatus blood volumes were found to be within the expected physiological range whilst PiCCO blood volumes were significantly higher, which was also observed in other studies. Future studies using 3D echo/MRI are required to validate these blood volumes. © 2010 Copyright jointly held by Springer and ESICM.
Sidorova J.V.,National Hematology Research Center |
Biderman B.V.,National Hematology Research Center |
Nikulina E.E.,National Hematology Research Center |
Sudarikov A.B.,National Hematology Research Center
Experimental Dermatology | Year: 2012
PCR-based clonality assay of rearranged T-cell receptor genes gamma and beta (TCRG and TCRB) in a number of cases could be essential to discriminate between cutaneous T-cell lymphomas and reactive lymphoproliferative lesions in the skin. However, extraction of good-quality DNA from skin specimens (especially formalin-fixed paraffin-embedded) remains a challenge. Common procedures, being labour-intensive and time-consuming and requiring toxic solvents such as phenol and chloroform, still may end up with DNA sample of insufficient quality. We herewith present a simple and efficient method for DNA isolation based on ammonia extraction of tissue, followed by neutralization and simultaneous salting out of proteins with acetic acid. We have analysed 30 samples - 24 fresh (16 skin, two spleen and six lymph node) and six paraffin-embedded. Standard procedure (proteinase K digestion, followed by phenol/chloroform extraction) has been carried out simultaneously. We observed good PCR signal for TCRG rearrangements in 30 samples processed with the new protocol and only in 20 extracted with proteinase K/phenol/chloroform. For TCRB, the success rate was 29 of 30 with the new protocol, compared to 11 of 30 with conventional protocol. The proposed method of DNA extraction should improve the value of T-cell clonality assay, because insufficient DNA quality and quantity may bias analysis towards monoclonality and therefore cause false-positive results. © 2011 John Wiley & Sons A/S.