Modeling of Benign Prostatic Hyperplasia in Rats with a High Dose of Testosterone.

In order to optimize the testosterone model of benign prostatic hyperplasia, we studied the effect of castration and different doses of testosterone on the induction of the proliferative process in the prostate of Wistar rats. It was shown that 4-week subcutaneous administration of testosterone propionate in a dose of 20 mg/kg causes pronounced proliferative and hemodynamic disorders in the dorsolateral gland morphologically similar in castrated and non-castrated males. Administration of testosterone in a dose of 3 mg/kg had no significant effect on the dynamics of the pathological process in non-operated rats and normalized the structure of the gland in castrated animals. Morphological study showed that castration of males provides no visible advantages in reproducing the testosterone model of benign prostatic hyperplasia. The proposed non-traumatic modification of the model with a high dose of testosterone has good reproducibility and sensitivity to therapeutic agents, as shown by the example of finasteride.

Prostatotropic Action of Glycyrrhizic Acid Disodium Salt in Benign Prostatic Hyperplasia Models.

The prostatotropic activity of glycyrrhizic acid disodium salt (Na2GA) was studied in the models of benign prostatic hyperplasia (BPH) induced by chronic injection of sulpiride (40 mg/kg intraperitoneally for 8 weeks) or testosterone propionate (20 mg/kg subcutaneously for 4 weeks) in the Wistar rats. The oral administration of Na2GA in a dose of 100 mg/kg produced a moderate antiproliferative effect in both BPH models resulting in reduced volume density of prostatic epithelium (in the testosterone model) and increased volume density of the glandular lumen (in both models). The observed prostatotropic effects of Na2GA were similar to those of Permixon and finasteride, but they were less pronounced as confirmed by smaller drops in epithelial volume density and epithelial-to-stromal ratio compared to the effects of both reference drugs.

Morphological Assessment of Prostatotropic Activity of (3,5-Dimethyl-4-Hydroxy)Benzyl Thiododecane on a Model of Benign Prostatic Hyperplasia in Rats.

Prostatotropic activity of (3,5-dimethyl-4-hydroxy)benzyl thiododecane (T-DD) was evaluated on a model of benign prostatic hyperplasia induced in Wistar rats by chronic (2 months) intraperitoneal administration of sulpiride (40 mg/kg). Morphometric analysis of the dorsolateral lobe of the prostate showed that after the 2-month course of intragastric T-DD (100 mg/kg) administered in parallel with sulpiride, the volume density of glandular epithelium decreased by 1.7 times, while the volume density of prostate stroma increased by 2 times. After administration of the reference drug Permixon at a dose of 50 mg/kg, the volume densities of epithelium decreased by 1.3 times and stromal volume density increased by 1.5 times. The observed effects are presumably related to suppression of 5α-reductase activity and modulation of estrogen receptors in the prostate.

Specific Features of Progression of the Parasitic Invasion, caused by Opisthorchis felineus, in Golden Hamsters.

The influence of Opisthorchis felineus invasion on the development of pathological changes in the hepatobiliary system was studied in 120 golden hamsters in a long-term experiment (42 weeks) after single infection per os in the dose of 50 metacercariae per animal. The animals were sacrificed on weeks 4, 8, 12, 16, 28 and 42. Chronic experimental infestation with O. felineus triggered a cascade of morphogenetic processes in both extrahepatic and intrahepatic biliary systems. At the early stages of the experiment, polyps and strictures of bile ducts were formed in the lobar bile ducts; in portal tracts, hyperplasia and adenomatous transformation of the newly formed epithelial structures were observed. At the later stages, third-degree biliary intraepithelial neoplasia developed in the lobar bile ducts; in the intrahepatic bile ducts, increased epitheliocyte hyperplasia and invasive growth of cell cords were observed, that impaired tissue architectonics. Progressing cell atypia can be classified as cholangiocellular cancer.

[Role of opisthorchis felineus on induction of bile duct cancer].

Opisthorchis felineus (Trematoda) is widespread in the Russian Federation, especially in Siberia, and other countries of Europe. Infestation of endemic area population with O. felineus reaches 80%. On animal models of the infection of closely related Opisthorchis viverrini combined with the nitrosamines' intake it has been shown that the parasite induces cholangiocarcinoma. However carcinogenic potential of O. felineus is still poorly studied. The present study is aimed to investigate the role of O. felineus in cholangiocarcinoma carcinogenesis in hamster treated additionally by dimethylnitrosamine (DMN). Golden hamsters were divided into 4 groups (15 specimens in the control group and 20 for other groups): (I) untreated control, (II) 12.5 ppm DMN solution intake, (III) infected with 50 metacercariae of O. felineus and (IV) infected with 50 metacercariae of O. felineus and 12.5 ppm DMN solution intake. According to the histological data, in the. O. felineus-infested group significant hyperplastic and dysplastic biliary changes were found considered as a precancerogenic state. Such pathological changes of bile ducts were more severe in group treated with both factors, with cholangiocarcinoma being found out at 18th week in all the animals of this group. These results demonstrate that O. felineus could play promoting role in two-step model in cholangiocarcinoma carcinogenesis and may be used to define the O.felineus group in the International Agency for Research on Cancer classification of agents, mixtures and exposures (IARC categories).

PT/Y Mice Are Sensitive to the Inhibitory Effect of o-Aminoazotoluene on Glucocorticoid Induction of Tyrosine Aminotransferase and Its Hepatocarcinogenic Effect.

PT/Y mice used for studies of the effects of mutagens are characterized by the absence of spontaneous tumors of the liver, but often develop these tumors in response to chronic oaminoazotoluene treatment. The level of glucocorticoid induction of adaptive hepatic enzyme tyrosine aminotransferase decreases by more than 70% 24 h after acute injection of o-aminoazotoluene to these animals. These mice can serve as a model for studies of the relationship between the effect of carcinogens on the regulation of activity of adaptive hepatic enzymes and their capacity to induce the development of liver tumors.

Hepatoprotective properties of betulonic acid amide and heptral in toxic liver injury induced by carbon tetrachloride in combination with ethanol.

Toxic liver injury with the development of fibrosis and cirrhosis was modeled in Wistar rats by intragastric administration of 0.1 ml/kg CCl4 in combination with 5% ethanol with glucose 3 times a week for 6 weeks. The animals were treated with betulonic acid amide (50 mg/kg in Tween aqueous solution) and heptral (6 mg/kg) as hepatoprotective compounds. It was found that betulonic acid amide stimulated the regenerative response in hepatocytes under conditions of combined toxic exposure and promoted recovery of their qualitative and quantitative characteristics, which was accompanied by a significant decrease in the severity of liver fibrosis and the absence of cirrhotic transformation of the liver.

[Antitumor activity of dihydrobetulonic acid amides in vitro and in vivo].

Amides with homopiperidinic and piperazinic cycles were synthesized from dihydrobetulonic acid which was obtained by dihydrobetulin oxidation. All substances have shown high antitumor activity (CCID50 3.5-36.2 microM) in vitro in lymphoid (CEM-13, U-937) and monocytic (MT-4) human cell lines. Amides with methyl- and ethyl-piperazinic residues don't influence viability of Lung Lewis Carcinoma cell in culture and haven't any significant effect to its transplantates in C57BL/6 mice. But such amides inhibit efficiently the metastatic elaboration in lung of these mice. The antimetastatic activity increases followed by the change of aliphatic residue length in piperazinic cycle from methyl to ethyl.

Correction of drug-induced hepatotoxicity with new triterpene derivatives in transplanted RLS lymphoma.

The hepatoprotective effects of new triterpene derivatives, betulin 3ß,28-di-O-nicotinate (of3) and 3,20-dioximino-29-norlup-28-ic acid methyl ester (of15), were studied in CBA/Lac mice with transplanted RLS lymphoma receiving polychemotherapy and without it. Injection of of3 and of15 agents to animals with tumors receiving polychemotherapy reduced the severity of toxic involvement of the liver, reduced mitotic activity of tumor cells in the primary node in animals receiving and not polychemotherapy, and produced a moderate antitumor effect. These effects were more pronounced for of15 agent. In addition, injection of agents of3 and of5 to animals with transplanted RLS lymphoma reduced the intensity of alterations associated with the total systems and local effects of the neoplastic process.

[Synthesis of aminopropylaminoderivatives of betulinic and oleanolic acids].

On the basis of betulinic and oleanolic acids triterpenoids with different with different amine fragments: (3-aminopropoxy)-, 3-acetyl-(3-aminopropyl)amino-, 6-[bis(3-aminopropyl)amino]hexylamino-, (3-aminopropyl)-4-aminosulfonyl-4-phenylamino- at positions C3 and C28 were synthesized. It is shown that betulonic acid amide with 4,4'-diaminodiphenylsulfonic substituent don't render antitumor effect in mice with transplantable Lewis lung carcinoma, but possess significant anti-inflammatory activity.

[Hepatoprotective activity of betulonic acid amides containing a piperidine or pyrrolidine nitroxide moiety].

Betulonic acid amides containing a nitroxyl radical moiety possess antiholestatic effects in mice. Introduction ofpiperidine nitroxide moiety into lupan core increases its hepatoprotective activity. Oral administration of piperidine nitroxide derivative in dose 50 mg/kg doesn't stimulate transplanted tumor growth and raises a lifespan of mice.

Effect of triterpene derivatives on the total hepatocyte count in the liver of rats with toxic hepatitis.

We studied hepatoprotective activity of betulonic acid and its alaninamide on the model of combined CCl(4)- and ethanol-induced toxic liver damage in rats. The test substances, especially betulonic acid alaninamide, considerably reduced the elevated biochemical parameters in animals with toxic liver damage. Betulonic acid alaninamide also stimulated reparative processes in the liver (activated hepatocyte proliferation). Heptral (reference drug) produced no appreciable effects on the reparative processes. Our findings suggest that betulin derivatives exhibit pronounced protective properties.

[Comparative proteomic characteristic of Mycoplasmas (Mollycutes)].

Saturating proteome identification and the study of post-translational protein modifications of Acholeplasma laidlawii using combination of single- and two-dimension gel electrophoresis followed by mass-spectrometry analysis have been carried out. Results were compared to the earlier identified proteome of Mycoplasma gallisepticum. It was found that M. gallisepticum and A. laidlawii express 61 and 58% of the annotated ORFs respectively. All subunits of DNA-polymerase III were identified during our study which indicates that our methods can detect single copies of a given protein per cell. Metabolic pathways of the respective mycoplasmas were compared further in this work.

Structure of the liver in mice with transplanted Lewis carcinoma during polychemotherapy and correction with betulonic acid and its derivatives.

Morphological and morphometric studies of the liver with transplanted Lewis carcinoma were performed after polychemotherapy and correction with betulonic and [3-oxo-20(29)-lupene-28-oil]-3-aminopropionic acids and their methyl esters. It was demonstrated than betulonic and [3-oxo-20(29)-lupene-28-oil]-3-aminopropionic acids reduced the degree of degenerative changes and volume density of necrotic changes in hepatocytes after polychemotherapy. Methyl esters of these acids little changed the severity and spreading of destructive and necrotic changes in the liver caused by complex cytostatic therapy. It was also shown that all studied triterpenoids exhibited more pronounced antimetastatic effect (evaluated by the decrease in volume density of liver metastases) compared to polychemotherapy.

Proteome analysis of chloroplasts from the moss Physcomitrella patens (Hedw.) B.S.G.

Intact chloroplasts were prepared from protoplasts of the moss Physcomitrella patens according to an especially developed method. They were additionally separated into stroma and thylakoid fractions. The proteomes of intact plastids, stroma, and thylakoids were analyzed by 1D-electrophoresis under denaturing conditions followed by protein digestion and nano-LC-ESI-MS/MS of tryptic peptides from gel bands. A total of 624 unique proteins were identified, 434 of which were annotated as chloroplast resident proteins. The majority of proteins belonged to a photosynthetic group (21.3%) and to the group of proteins implicated in protein degradation, posttranslational modification, folding, and import (20.6%). Among proteins assigned to chloroplasts, the following groups are prominent combining proteins implicated in metabolism of: amino acids (6.9%), nucleotides (2.5%), lipids (2.2%), carbohydrates (2.4%), hormones (1.5%), isoprenoids (1.25%), vitamins and cofactors (1%), sulfur (1.25%), and nitrogen (1%); as well as proteins involved in the pentose-phosphate cycle (1.75%), tetrapyrrole synthesis (3.7%), and redox processes (3.6%). The data can be used in physiological and photobiological studies as well as in further studies of P. patens chloroplast proteome including structural and functional specifics of plant protein localization in organelles.

Antiulcer activity of preparations containing ultralow doses of antibodies in modeled chronic ulcer in rats.

Screening of three potential antiulcer preparations containing ultralow doses of antibodies to endogenous regulators of ulcer formation (gastrin, histamine, and H2 histamine receptors) on the model of acetic acid-induced gastric ulcer in rats revealed pronounced antiulcer effect of ultralow doses of antibodies to histamine. The dynamics of regeneration of the ulcer focus by morphological and histological characteristics was similar during treatment with ultralow doses of antibodies to histamine and with famotidine.

Hepatocarcinoma-29, a metastasizing transplantable mouse tumor inducing cachexia.

Here we describe an experimental tumor, hepatocarcinoma-29: transplantable strain of this tumor is maintained in an ascitic form in CBA/LacYIcgn mice in Institute of Cytology and Genetics of SD of RAS. After inoculation into the thigh muscles, the tumor induces anorexia, progressing loss of fat and muscle tissues, and physiological changes specific for cachexia: leukocytosis, hypoglycemia, and hypercorticism. The tumor metastasizes to all vital viscera and leads to animal death from renal failure.

Evaluation of magnetic resonance imaging characteristics of new nitroxyl radicals on the model of RLS lymphoma.

Toxic and magnetic resonance contrast characteristics of new nitroxyl radicals Fur-135 and Fur-176 were studied in experiments on mice. The test compounds exhibited low toxicity and allowed us to increase contrasting of transplanted RLS lymphoma. Fur-135 differs by the type of contrasting from Gd(3+)-containing preparation omniscan and locates the tumor focus with high precision.

Cardiomyocyte count in rat myocardium under the effect of antitumor agents cyclophosphamide and triterpenoids.

Structural reorganization of the myocardium in response to antitumor agents (cyclophosphamide, betulonic acid and its amide) was studied. Cardiotoxic effects of these chemicals manifested in cardiomyocyte contracture and lytic injuries and by significant hemodynamic disorders. The most pronounced lytic and necrobiotic changes in cardiomyocytes were detected after injection of cyclophosphamide followed by betulonic amide; this led to a more pronounced decrease in heart weight as a result of a decrease in total cardiomyocyte count. Antitumor drugs differently changed the ratio of mono- to binuclear cardiomyocytes, which differ by their regeneratory and compensatory adaptive potential.