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Biomedical subjects

N A Smirnova

Publications and source records attributed to N A Smirnova.

At least 19 recordsLinked to original sources
PubMed2006

Microarray analysis of differentially expressed genes after exposure of normal human fibroblasts to ionizing radiation from an external source and from DNA-incorporated iodine-125 radionuclide.

Exposure of cells to ionizing radiation (IR) produces changes in the expression level of a large number of genes. However, less is known of gene-expression changes caused by local radiation exposure from radionuclides within cells. We studied changes in the genome-wide gene expression induced by decay of 125I incorporated into DNA as [125I]-iododeoxyuridine (125I-IUdR) in normal IMR-90 human lung fibroblasts and compared them with the changes produced by external gamma-radiation delivered at high (HDR) or low (LDR) dose rate. We found that more than 2000 genes were consistently up- or down-regulated following HDR and LDR gamma-radiation. The profiles of differentially expressed genes following HDR and LDR shared about 64% (up) and 74% (down) genes in common, with many genes identified as radiation-responsive for the first time. In contrast, in all only 206 genes changed their expression level in the 125I-IUdR-treated cells, even though the total number of DNA double-strand breaks (DSB) produced by 125I-IUdR exceeded that produced by the gamma-radiation. With few exceptions, the expression levels of 125I-IUdR-responsive genes were also altered following gamma-irradiation. Therefore, nuclear DNA-localized decays of 125I produce 10 times fewer differentially expressed genes than whole-cell exposure to gamma-radiation of comparable dose. These results suggest that the effect of IR on the changes in global gene expression depends on the distribution of energy depositions within the cell. In contrast to cell survival, DNA DSB may not be the major factor modulating changes in gene expression following irradiation.

Cell Line↗
PubMed2004

Unambiguous identification of three beta-decaying isomers in 70Cu.

Using resonant laser ionization, beta-decay studies, and for the first time mass measurements, three beta-decaying states have been unambiguously identified in 70Cu. A mass excess of -62 976.1(1.6) keV and a half-life of 44.5(2) s for the (6-) ground state have been determined. The level energies of the (3-) isomer at 101.1(3) keV with T(1/2)=33(2) s and the 1+ isomer at 242.4(3) keV with T(1/2)=6.6(2) s are confirmed by high-precision mass measurements. The low-lying levels of 70Cu populated in the decay of 70Ni and in transfer reactions compare well with large-scale shell-model calculations, and the wave functions appear to be dominated by one proton-one neutron configurations outside the closed Z=28 shell and N=40 subshell. This does not apply to the 1+ state at 1980 keV which exhibits a particular feeding and deexcitation pattern not reproduced by the shell-model calculations.

Journal Article↗
PubMed1999

[Zenker's diverticulum].

An experience with treatment of 14 women and 15 men aged from 41 to 83 years with Zenker's diverticulum was analyzed. Most liable to the disease were people at the age from 50 to 70 years. The average duration of the disease was 3-4 years. All the patients were subjected to improved surgical interventions: resection of the diverticulum (11 patients), operations under the control of the endoscopic technique (18 patients). Resections of the diverticulum were combined with cryopharyngeal myotomy. No complications were noted. There were no lethal outcomes. So, wider indications to operative treatment in patients with Zenker's diverticulum, endoscopic methods used at all stages of treatment as well as improved methods of performing the operation enabled the authors to obtain good immediate and long-term results.

Adult↗
PubMed1992

[The significance of haptoglobin in the differential diagnosis of tuberculosis of the female genital organs].

Study included 115 women with suspicion of genital tuberculosis. Combined clinical, X-ray and laboratory examination made it possible to classify patients into 3 groups: group 1 included 44 patients with active genital tuberculosis, group 2 32 women with clinically cured tuberculosis of internal genitalia and group 3 39 women with nonspecific genital diseases. The haptoglobin-tuberculin test was given to all patients. High haptoglobin parameters before or 72 h after tuberculin administration were found only in the group of patients with active genital tuberculosis. In groups 2 and 3 the haptoglobin level did not exceed normal values both before and after tuberculin administration in a dose of 50 TU. The informative value of serum haptoglobin parameters in patients with active tuberculosis of internal genitalia constituted 88.6%.

Adult↗
PubMed1992

[Biochemical mechanisms of neurotoxic reactions to antibacterial preparations in patients with pulmonary tuberculosis].

Examination comprising the electrophysiologic method and study of the biochemical parameters of the antioxidant/lipid peroxidation system and metabolism of biologic amines in 163 patients with infiltrative pulmonary tuberculosis has revealed a clear interaction existing between the functional changes of the CNS state, the state of antioxidative defense (alpha-tocopherol) and serotonin. This allows an assumption that the antioxidant/lipid peroxidation system and serotoninergic system actively participate in the pathogenesis of development of neurotoxic reactions to antibacterial preparations in the clinical picture of tuberculosis.

Antioxidants↗
PubMed1991

[The effect of sodium oxybutyrate on various regulatory mechanisms of pulmonary hemodynamics in experimental tuberculosis in dogs].

The role of cyclic nucleotides and prostaglandins E1 and F2 alpha in pulmonary hypertension formation was elucidated in experimental tuberculosis in dogs and the mechanism of a hypotensive action of sodium oxybutyrate specified with consideration of its influence on the non-gas exchange pulmonary function. The level of the above compounds was studied in the blood taken from the pulmonary artery and aorta in comparison with pulmonary artery pressure prior to and after intravenous injection of sodium oxybutyrate, an antihypoxant. Pulmonary vessel tone was found to depend on the cGMP content and synthesis in the lungs both in health and in tuberculosis and pulmonary hypertension in tuberculosis was associated with a deranged level and correlation of cAMP, cGMP and prostaglandins E1 and F2 alpha in pulmonary circulation. It has been demonstrated that the hypotensive effect of sodium oxybutyrate is associated with its influence on these biochemical parameters in plasma.

Alprostadil↗
PubMed1991

[Functional state of the hypothalamo-hypophyseal-ovarian system in female patients with tuberculosis of the genital organs].

Blood concentrations of LH, FSH, estradiol, prolactin, growth hormone, cortisol, testosterone and progesterone have been examined in 76 patients with active tuberculosis of the internal genitalia (group 1), 18 patients with longterm sequelae of clinically asymptomatic tuberculosis (group 2) and 41 patients with nontuberculous diseases of the internal genitalia. Abnormalities were identified in 56.5% of group 1 patients, 33% of group 2 and 46.4% of group 3 patients. The patients with active tuberculosis characteristically had a low gonadotropin and estradiol secretion. High prolactin levels were related to pituitary adenoma or tuberculous infection; polycystic ovaries were a cause of testosterone and stress of examination of cortisol elevation.

Adult↗
PubMed1990

[The pro-fibrotic and pro-oxidant action of isoniazid].

As a result of experimental research on rats with destructive pulmonary tuberculosis, oxidative action of isoniazid in a dose of 50 mg per kg body weight, corresponding to the mean therapeutic dose of 10 mg/kg in man, was clearly defined. Fibrotic action of the drug was also shown. It manifested itself by a sharp rise of insoluble collagen levels in the lung tissue tuberculous lesion focus of the treated animals and in the formation of mature connective tissue. Two mechanisms of isoniazid's pro-fibrotic action are presented.

Animals↗
PubMed1990

[Dynamics of biochemical indices in a favorable course of sarcoidosis of the respiratory organs].

Sarcoidosis ran a favourable course in 166 out of 179 patients. The active phase of sarcoidosis was characterized by dysproteinemia, high content of histamine, STH and beta-lipoproteins together with a decrease of HPI and total protein. More remarkable shifts were observed in patients afflicted with sarcoidosis of the intrathoracic lymph nodes and of the lungs. In the phase of regression, there was a unidirectional change in the majority of the parameters, which correlated with the process liability to the reverse development. It may be recommended that the content of histamine, HPI and beta-lipoproteins should be measured along with other parameters to estimate the process activity in patients with respiratory sarcoidosis.

Adolescent↗
PubMed1989

[Closed thoracic trauma and concomitant diseases].

Examined were 340 patients with closed thoracic trauma and posttraumatic pneumonia. Often, this complication was revealed in the elderly and senile. Chronic non-specific diseases of the lungs, pneumothorax predisposed to occurrence of posttraumatic pneumonia. The methods for treatment of a given complication have been developed. Diseases of the heart, vascular system in thoracic trauma can cause the aggravation of a patient's state up to lethal outcome.

Aged↗
PubMed1989

[Clinico-endoscopic evaluation of the effectiveness of the treatment of uncomplicated gastroduodenal ulcers after local administration of solcoseryl and aevit].

The complex of conservative measures for noncomplicated peptic ulcers included curative endoscopy in 105 patients, in 61 of them Aevitum was used as an application with additional injections of Solcoseryl around the ulcers. In 44 patients Aevitum was used along with Solcoseryl which was injected into the submucous layer around the pathological focus of the stomach and duodenum. The results obtained gave a convincing evidence of advantages of interstitial administration of Aevitum allowing to considerably shorten time of treatment (up to 10-12 days) of noncomplicated ulcers of the stomach and duodenum.

Actihaemyl↗
PubMed1989

[Mechanism of the hypotensive effect of sodium oxybutyrate in pulmonary hypertension in experimental tuberculosis in dogs].

The mechanism of sodium oxybutyrate effect on the lung vessels under normal conditions and under conditions of experimental tuberculosis in dogs was studied by the time course of pressure in the pulmonary artery and the content of serotonin, histamine and adenosine in blood of the aorta and pulmonary artery after the drug intravenous administration. To confirm the antihypoxic effect of sodium oxybutyrate, the levels of lactate, pyruvate, ATP, ADP and AMP were investigated. The levels of adenosine were judged indirectly by the activity of 5-nucleotidase, adenosine desaminase and AMP. It was shown that the decrease in pressure in the pulmonary artery after the use of sodium oxybutyrate was connected with the drug antihypoxic effect which led to lower levels of histamine in the aorta blood under the normal conditions and to higher levels of adenosine under the conditions of tuberculosis.

Animals↗