Microbiome and radiotherapy represent bidirectionally interacting entities. The human microbiome has emerged as a pivotal modulator of the efficacy and toxicity of radiotherapy; however, a reciprocal effect of radiotherapy on microbiome composition alterations has also been observed. This review explores the relationship between the microbiome and extracranial solid tumors, particularly focusing on the bidirectional impact of radiotherapy on organ-specific microbiome. This article aims to provide a systematic review on the radiotherapy-induced microbial alteration in-field as well as in distant microbiomes. In this review, particular focus is directed to the oral and gut microbiome, its role in the development and progression of cancer, and how it is altered throughout radiotherapy. This review concludes with recommendations for future research, such as exploring microbiome modification to optimize radiotherapy-induced toxicities or enhance its anti-cancer effects.
Mikrobiom střeva hraje klíčovou roli v dlouhodobém fyzickém i psychickém zdraví člověka. Jeho vhodné složení během počáteční kolonizace gastrointestinálního traktu novorozenců s dostatečným zastoupením taxonů s komenzálním či probiotickým potenciálem je zásadní pro obranu před infekcemi a správný vývoj imunitního systému. Enterobakterie tvoří nedílnou součást střevní mikrobioty a mají klíčovou úlohu v počáteční kolonizaci střeva novorozence. Zároveň se jedná o potenciální patogeny, které mohou způsobovat závažné infekce. V článku jsou popsány funkce enterobakterií v mikrobiotě kojenců, rizika spojená s jejich nadměrnou přítomností a strategie prevence infekcí. Dále jsou diskutovány faktory ovlivňující formování mikrobioty u dětí, včetně způsobu porodu a vlivu antibiotik. Výzkumy ukazují, že podpora přirozeného porodu, kojení a použití probiotik mohou pozitivně ovlivnit střevní mikrobiotu a eliminovat potenciální rizika spojená s enterobakteriemi. Článek poskytuje přehled současných poznatků o enterobakteriích v mikrobiotě kojenců a zdůrazňuje potřebu dalšího výzkumu a sdílení nových poznatků v klinické praxi, aby byl zajištěn zdravý vývoj dětí.
The gut microbiome plays a key role in a person's long-term physical and psychological health. Its appropriate composition during the initial colonization of the gastrointestinal tract of newborns with the sufficient representation of the taxa with commensal or probiotic potential is essential for defence against infections and proper development of the immune system. Enterobacteria form an integral part of the intestinal microbiota and play a vital role in the initial colonization of the newborn gut. At the same time, these are potential pathogens that can cause serious infections. This article describes the functions of enterobacteria in the microbiota of infants, the risks associated with their excessive presence, and strategies for preventing infections. Furthermore, factors affecting microbiota formation in children are discussed, including the delivery method and the effect of antibiotics. Research shows that promoting natural childbirth, breastfeeding, and probiotic use can positively influence the gut microbiota and eliminate potential risks associated with enterobacteria. The article provides an overview of current knowledge about enterobacteria in the microbiota of infants and highlights the need for further research and the sharing of new knowledge in clinical practice to ensure the healthy development of children.
- Klíčová slova
- granadaene,
- MeSH
- bakteriální zoonózy etiologie MeSH
- brouci mikrobiologie patogenita MeSH
- feces mikrobiologie MeSH
- grampozitivní koky * chemie izolace a purifikace patogenita MeSH
- jedlý hmyz * mikrobiologie patogenita MeSH
- Lactococcus chemie izolace a purifikace patogenita MeSH
- Leontopithecus mikrobiologie MeSH
- riziko MeSH
- střevní mikroflóra MeSH
- Publikační typ
- přehledy MeSH
Často se přehlíží nepostradatelná úloha oligosacharidů obsažených v mateřském mléce pro správný vývoj novorozence. Mateřské mléko obsahuje více než 200 dosud identifikovaných struktur oligosacharidů s rozmanitými vlastnostmi. Prospěšné funkce oligosacharidů jsou reprezentovány jejich prebiotickým efektem, antiadhezivním a antimikrobiálním účinkem či vlivem na vývoj nervové soustavy a imunity dítěte. Cílem práce bylo sumarizovat a zmapovat poznatky budoucích matek pomocí dotazníkového šetření o prospěšnosti kojení, mateřského mléka, a především jeho oligosacharidů. Tento dotazník obsahoval celkem 15 otázek a rovněž informační pasáže, které edukovaly respondentky v rámci této problematiky. Dotazník vyplnilo 861 respondentek a při následném zpracování získaných informací bylo zjištěno s jakými informacemi maminky disponují před nástupem laktace či v jejím průběhu.
Human milk is a vital source of over 200 oligosaccharide structures contributing significantly to newborn development. Despite their essential role, these oligosaccharides often go unnoticed. Human milk oligosaccharides offer several benefits, including prebiotic, antiadhesive, and antimicrobial properties. They also play a crucial role in developing of a child's nervous system and immunity. The aim of the study was to summarize and map the knowledge of prospective mothers through a questionnaire survey on the benefits of breastfeeding, breast milk, and especially its oligosaccharides. The survey included 15 questions with educational passages. Eight hundred sixty-one female respondents provided several valuable insights into breast milk oligosaccharides' benefits before the onset of lactation or during it.
- MeSH
- dospělí MeSH
- kojení MeSH
- lidé středního věku MeSH
- lidé MeSH
- mateřské mléko * MeSH
- mladiství MeSH
- oligosacharidy * MeSH
- průzkumy a dotazníky MeSH
- těhotné ženy MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladiství MeSH
- ženské pohlaví MeSH
- Publikační typ
- práce podpořená grantem MeSH
- přehledy MeSH
BACKGROUND: Only a few studies dealt with the occurrence of endospore-forming clostridia in the microbiota of infants without obvious health complications. METHODS: A methodology pipeline was developed to determine the occurrence of endospore formers in infant feces. Twenty-four fecal samples (FS) were collected from one infant in monthly intervals and were subjected to variable chemical and heat treatment in combination with culture-dependent analysis. Isolates were identified by MALDI-TOF mass spectrometry, 16S rRNA gene sequencing, and characterized with biochemical assays. RESULTS: More than 800 isolates were obtained, and a total of 21 Eubacteriales taxa belonging to the Clostridiaceae, Lachnospiraceae, Oscillospiraceae, and Peptostreptococcaceae families were detected. Clostridium perfringens, C. paraputrificum, C. tertium, C. symbiosum, C. butyricum, and C. ramosum were the most frequently identified species compared to the rarely detected Enterocloster bolteae, C. baratii, and C. jeddahense. Furthermore, the methodology enabled the subsequent cultivation of less frequently detectable gut taxa such as Flavonifractor plautii, Intestinibacter bartlettii, Eisenbergiella tayi, and Eubacterium tenue. The isolates showed phenotypic variability regarding enzymatic activity, fermentation profiles, and butyrate production. CONCLUSIONS: Taken together, this approach suggests and challenges a cultivation-based pipeline that allows the investigation of the population of endospore formers in complex ecosystems such as the human gastrointestinal tract.
- MeSH
- Clostridium * genetika MeSH
- feces mikrobiologie MeSH
- Firmicutes genetika MeSH
- kojenec MeSH
- lidé MeSH
- mikrobiota * MeSH
- RNA ribozomální 16S genetika MeSH
- Check Tag
- kojenec MeSH
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Lactulose is commonly used in pharmacy for constipation and hepatic encephalopathy treatment. The prebiotic effect of lactulose is also often mentioned. However, its cryoprotective effect in combination with lecithin on the main representatives of probiotics has not been tested yet. The 12 taxa of bifidobacteria and Lactobacillaceae members were used for the purpose. These were mixed in a ratio of 1:1 with lactulose + lecithin (finally 5.0% and 1.25%, respectively; LL). The 25% glycerol (G+) solution and cultures themselves were applied as positive and negative controls, respectively. Bacterial suspensions were stored at a mild freezing temperature (-20°C) until the end of the experiment (210th day). The LL solution had a comparable (insignificant difference at the P-value = 0.05) cryoprotective effect as the positive control in five of six bifidobacteria and in three of six representatives of Lactobacillaceae. The better cryoprotective effect was revealed in other Lactobacillaceae. At the end of the experiment, the generally accepted therapeutic minimum (>107 Colony Forming Units/mL) was determined in LL solution in five bifidobacteria and four Lactobacillaceae strains. The presented results improve knowledge about long-term mild cryopreservation of the most commonly used probiotics and could contribute to developing new forms of (nutri)synbiotics.
A balanced microbiota is a main prerequisite for the host's health. The aim of the present work was to develop defined pig microbiota (DPM) with the potential ability to protect piglets against infection with Salmonella Typhimurium, which causes enterocolitis. A total of 284 bacterial strains were isolated from the colon and fecal samples of wild and domestic pigs or piglets using selective and nonselective cultivation media. Isolates belonging to 47 species from 11 different genera were identified by MALDI-TOF mass spectrometry (MALDI-TOF MS). The bacterial strains for the DPM were selected for anti-Salmonella activity, ability to aggregate, adherence to epithelial cells, and to be bile and acid tolerant. The selected combination of 9 strains was identified by sequencing of the 16S rRNA gene as Bacillus sp., Bifidobacterium animalis subsp. lactis, B. porcinum, Clostridium sporogenes, Lactobacillus amylovorus, L. paracasei subsp. tolerans, Limosilactobacillus reuteri subsp. suis, and Limosilactobacillus reuteri (two strains) did not show mutual inhibition, and the mixture was stable under freezing for at least 6 months. Moreover, strains were classified as safe without pathogenic phenotype and resistance to antibiotics. Future experiments with Salmonella-infected piglets are needed to test the protective effect of the developed DPM.
- Publikační typ
- časopisecké články MeSH
Bifidobacteria, which commonly inhabit the primate gut, are beneficial contributors to host wellbeing. Anatomical differences and natural habitat allow an arrangement of primates into two main parvorders; New World monkeys (NWM) and Old World monkeys (OWM). The number of newly described bifidobacterial species is clearly elevated in NWM. This corresponds to our finding that bifidobacteria were the dominant group of cultivated gut anaerobes in NWM, while their numbers halved in OWM and were often replaced by Clostridiaceae with sarcina morphology. We examined an extended MALDI-TOF MS database as a potential identification tool for rapid screening of bifidobacterial distribution in captive primates. Bifidobacterial isolates of NWM were assigned mainly to species of primate origin, while OWM possessed typically multi-host bifidobacteria. Moreover, bifidobacterial counts reflected the feed specialization of captive primates decreasing from frugivore-insectivores, gummivore-insectivores, frugivore-folivores to frugivore-omnivores. Amplicon sequencing analysis supported this trend with regards to the inverse ratio of Actinobacteria and Firmicutes. In addition, a significantly higher diversity of the bacterial population in OWM was found. The evolution specialization of primates seems to be responsible for Bifidobacterium abundance and species occurrence. Balanced microbiota of captive primates could be supported by optimized prebiotic and probiotic stimulation based on the primate host.
- MeSH
- Bifidobacterium genetika izolace a purifikace MeSH
- feces mikrobiologie MeSH
- mikrobiota * MeSH
- primáti mikrobiologie MeSH
- probiotika MeSH
- RNA ribozomální 16S genetika MeSH
- spektrometrie hmotnostní - ionizace laserem za účasti matrice MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Clostridium ventriculi (syn. Sarcina ventriculi) is a Gram-positive opportunistic pathogen with sarcina morphology. In the case of gastrointestinal disorders, the treatment is often empirical. Due to the common occurrence in primates and the potential risk of dysbiosis; the antibiotic susceptibility screening of C. ventriculi strains isolated from guenon monkeys and crested gibbons to 58 antibiotics was performed to reduce potentially ineffective antibiotic use in case of disease. Isolates were found to be susceptible to the majority of the tested antibiotics, mainly to (fluoro)quinolones, macrolides, penicillins, and tetracyclines. The susceptibility profiles were similar despite the hosts. Tested strains showed also natural resistance to a few antibiotics on the genus level. Detected in vitro antibiotic efficiency is consistent with documented human treatment cases.
- MeSH
- antibakteriální látky terapeutické užití MeSH
- Clostridium účinky léků genetika MeSH
- genetická variace MeSH
- genotyp MeSH
- Haplorrhini mikrobiologie MeSH
- Hylobates mikrobiologie MeSH
- klostridiové infekce diagnóza farmakoterapie MeSH
- primáti mikrobiologie MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- srovnávací studie MeSH
