Next generation probiotics: an overview of the most promising candidates.

Research in the field of human microbiota and its impact on human health has opened new possibilities for the diagnosis, prevention or treatment of certain pathological conditions. A negative change in the composition of the intestinal microbiota, dysbiosis, is associated with diseases such as inflammatory bowel diseases, obesity, diabetes mellitus, or Clostridium difficile infections. For the use of human microbiota or its biologically active products in clinical practice, it is necessary to thoroughly identify and characterize properties that may be beneficial to human health. The use of the latest technology enables such research to be carried out, and we are already aware of several potential candidates for the so-called probiotics of the next generation. The aim of this article is to summarize available information on the bacteria Akkermansia muciniphila, Bacteroides fragilis, and Faecalibacterium prausnitzii, which are among the most promising and studied candidates.

Identification and biological activity of potential probiotic bacterium isolated from the stomach mucus of breast-fed lamb

The lactic acid bacterium E isolated from the stomach mucus of breast-fed lamb was identified by sequencing of 16S rDNA fragment and species-specific PCR as Lactobacillus reuteri. Its potential antimicrobial activity and ability to modulate immune system in vitro and in vivo was determined. The growth inhibition of potential pathogens decreased from Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella enterica ser. Minnesota to Escherichia coli. The lowest inhibition activity was observed in the case of Candida albicans. The ability of L. reuteri E to modulate biological activities of human and mouse mononuclear cells was estimated in vitro and in vivo, respectively. The production of IL-1 by monocytes in vitro was significantly induced by L. reuteri E (relative activity 2.47). The ability to modulate biological activities of mononuclear cells by living L. reuteri E cells in vitro in comparison to disintegrated L. reuteri E cells in vivo differed. For example lysozyme activity in vitro was inhibited while in vivo was stimulated (relative activities 0.30 and 1.83, respectively). The peroxidase activity in vitro was stimulated while in vivo was inhibited (relative activities 1.53 and 0.17, respectively). Obtained results indicate that L. reuteri E is potential candidate to be used in probiotic preparations for animals and/or human.

Identification and biological activity of potential probiotic bacterium isolated from the stomach mucus of breast-fed lamb

The lactic acid bacterium E isolated from the stomach mucus of breast-fed lamb was identified by sequencing of 16S rDNA fragment and species-specific PCR as Lactobacillus reuteri. Its potential antimicrobial activity and ability to modulate immune system in vitro and in vivo was determined. The growth inhibition of potential pathogens decreased from Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella enterica ser. Minnesota to Escherichia coli. The lowest inhibition activity was observed in the case of Candida albicans. The ability of L. reuteri E to modulate biological activities of human and mouse mononuclear cells was estimated in vitro and in vivo, respectively. The production of IL-1β by monocytes in vitro was significantly induced by L. reuteri E (relative activity 2.47). The ability to modulate biological activities of mononuclear cells by living L. reuteri E cells in vitro in comparison to disintegrated L. reuteri E cells in vivo differed. For example lysozyme activity in vitro was inhibited while in vivo was stimulated (relative activities 0.30 and 1.83, respectively). The peroxidase activity in vitro was stimulated while in vivo was inhibited (relative activities 1.53 and 0.17, respectively). Obtained results indicate that L. reuteri E is potential candidate to be used in probiotic preparations for animals and/or human.

Identification and biological activity of potential probiotic bacterium isolated from the stomach mucus of breast-fed lamb.

The lactic acid bacterium E isolated from the stomach mucus of breast-fed lamb was identified by sequencing of 16S rDNA fragment and species-specific PCR as Lactobacillus reuteri. Its potential antimicrobial activity and ability to modulate immune system in vitro and in vivo was determined. The growth inhibition of potential pathogens decreased from Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella enterica ser. Minnesota to Escherichia coli. The lowest inhibition activity was observed in the case of Candida albicans. The ability of L. reuteri E to modulate biological activities of human and mouse mononuclear cells was estimated in vitro and in vivo, respectively. The production of IL-1ß by monocytes in vitro was significantly induced by L. reuteri E (relative activity 2.47). The ability to modulate biological activities of mononuclear cells by living L. reuteri E cells in vitro in comparison to disintegrated L. reuteri E cells in vivo differed. For example lysozyme activity in vitro was inhibited while in vivo was stimulated (relative activities 0.30 and 1.83, respectively). The peroxidase activity in vitro was stimulated while in vivo was inhibited (relative activities 1.53 and 0.17, respectively). Obtained results indicate that L. reuteri E is potential candidate to be used in probiotic preparations for animals and/or human.

PCBs in samples from the environment of the Southern Moravia Region, Czech Republic.

The determination of polychlorinated biphenyls (PCBs) in water, sediment and fish samples from the Czech Republic was carried out using high resolution gas chromatography with electron capture detection. PCBs concentrations in water and sediment samples were rather low and corresponded with the findings from some prior studies. On the other hand, investigated samples of fish tissue were highly contaminated (on average 1.3-266 ng/g fat for individual PCBs), thus, a continuing contamination of fish species with PCBs was proved.

[Lactobacilli and their probiotic properties]. / Laktobacily a ich probiotické vlastnosti.

Lactobacilli rank among lactic acid bacteria, fermenting saccharides to produce lactic acid. The individual species and strains differ by the profiles of fermented saccharides, but this property is not sufficient for the identification at the species level. The species and strains differ in the 16S rDNA sequence and in the intergenic space between 16S and 23S rDNA, which make their differentiation and identification possible. Some representatives of the genus Lactobacillus are included in probiotic preparations with regard to their beneficial health effects on the human and animal organisms. For example, they are able to interact with the immune system and stimulate it positively, to reduce the manifestations of lactose intolerance by consuming fermented milk products, and to shorten postantibiotic and travellers' diarrhoea. Lactobacilli also produce bacteriocins, antimicrobially active substances.

[Characterization of polyphenoloxidase from the latex of greater celandine (Chelidonium majus L.)]. / Charakterizácia polyfenoloxidázy z latexu lastovidníka väcseho (Chelidonium majus L.).

Greater celandine, similarly as other plants of the family Papaveraceae, produces benzylisoquinoline alkaloids, primarily benzophenanthridines. Polyphenoloxidase (PPO) is most probably involved in the formation of dopamine, which is one of the precursors of norcoclaurine, the first intermediate with the benzylisoquinoline structure. This study has revealed that PPO present in the latex of greater celandine is localized in the organelles, which serve to store alkaloids (the so-called 1000 g organelles). The enzyme was purified by means of affinity chromatography into electrophoretic homogeneity. It possesses a relative molecular mass of approximately 65 kDa and exerts two activities, the monophenolase and diphenolase ones. With the use of a polymerase chain reaction, it was possible to amplify a part of the PPO gene from the region of the active site.

[Enzymology of production of benzylisoquinoline alkaloids]. / Enzymológia tvorby benzylizochinolínových alkaloidov.

This review paper summarizes the current knowledge of enzymes participating in the production of benzylisoquinoline alkaloids. This group of alkaloids comprises, e.g., morphine, codeine, thebaine, and sanginarine, which have an irreplaceable position in pharmaceutical practice. For the time being, chemists have not managed to prepare them synthetically with sufficient efficacy, and therefore the study of the enzymology of their formation remains a topical problem. The paper pays particular attention to the knowledge of individual enzymes on the molecular, or gene level. This very knowledge is essential for possible introduction of molecular-genetic approaches to the cultivation of plants producing therapeutically interesting benzylisoquinoline alkaloids.

[Role of amine oxidase in the biosynthesis of alkaloids]. / Uloha aminooxidázy v biosyntéze alkaloidov.

The review paper deals with the contemporary theoretical knowledge about the role of Cu-aminooxidase in the biosynthesis of alkaloids in plants. In the biosynthesis of tropane and piperidine alkaloids, aminooxidase participates in the conversion of amines into aldehydes which are the first important intermediates in the biosynthesis of these alkaloids. Norkoklaurine, the precursor of benzylisoquinoline alkaloids, is formed by condensation of dopamine and tyral. In the biosynthesis of benzylisoquinoline alkaloids of protoberberine and berberine type, tyral, the aldehyde condensation unit, is produced by the action of aminooxidase. In morphinan alkaloids, the catalytic role of aminooxidase in the formation of tyral have not been demonstrated yet. The paper pays special attention to the mechanism of the aminooxidase-catalyzed reaction, the structure of the active site of the enzyme, and the molecular-biological properties of Cu-aminooxidases.

Expression of the LFA-1 beta molecule on peripheral blood leukocytes of patients with early-onset periodontitis: effects of dental plaque microbes.

The effect of dental plaque bacteria on LFA-1 beta expression on peripheral blood leukocytes was studied in 20 patients with early-onset periodontitis and in 10 healthy controls. Stimulation of PMN with selected dental plaque bacteria which play a role in the pathogeny of periodontitis significantly increased the expression of LFA-1 beta in the group of patients as compared with the controls.

[Metazosin tablets (Kenosin) in the treatment of chronic congestive heart failure]. / Metazosin tabl. (Kenosin), pri lécbe chronického mestnavého srdecního selhávání.

BACKGROUND: Postsynaptic alpha 1 adrenoceptor blockers are considered suitable drugs for modern vasodilatatory treatment of chronic heart failure. Therefore new analogues of these substances with more favourable characteristics than those of their main representative, prazosin are sought. The objective of the present work was to evaluate the therapeutic effect and tolerance of the original alpha 1-adrenoceptor blocker metazosin developed in the Research Institute for Pharmacy and Biochemistry (VUFB). METHODS AND RESULTS: In a multicentre clinical trial metazosin (tablets à 10 mg), 10-20 mg/day, were added to standard treatment of 56 patients of both sexes suffering from chronic congestive heart failure, for a period of eight weeks. The administration of metazosin led to rapid improvement of subjective complaints (in particular dyspnoea) as well as objective symptoms of peripheral congestion, to a significant (p < 0.05) regression of X-ray signs of pulmonary congestion and a slight (but statistically significant--p < 0.05) increase of the ejection fraction and cardiac output. After two months treatment the functional degree of severity of insufficiency according to the NYHA classification decreased from 2.7 to 2.2. Metazosin did not induce tachycardia and was well tolerated by the patients. CONCLUSIONS: Metazosin (Kenosin) tablets is a suitable supporting drug in the comprehensive treatment of chronic cardiac failure, in particular if refractory to treatment.