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Project description:Accidental or iatrogenic ionizing radiation exposure precipitates acute and chronic radiation injuries. The traditional paradigm of mitigating radiotherapy-associated adverse side effects has ignored the gender-specific dimorphism of patients' divergent responses. Here, the effects of sexual dimorphism on curative efficiencies of therapeutic agents is examined in murine models of irradiation injury. Oral gavage of simvastatin ameliorates radiation-induced hematopoietic injury and gastrointestinal tract dysfunction in male mice, but adversely deteriorates these radiation syndromes in female animals. In a sharp contrast, feeding animals with high-fat diet (HFD) elicites explicitly contrary results. High-throughput sequencing of microbial 16S rRNA, host miRNA, and mRNA shows that simvastatin or HFD administration preventes radiation-altered enteric bacterial taxonomic structure, preserves miRNA expression profile, and reprogrammes the spectrum of mRNA expression in small intestines of male or female mice, respectively. Notably, faecal microbiota transplantation of gut microbes from opposite sexual donors abrogates the curative effects of simvastatin or HFD in respective genders of animals. Together, these findings demonstrate that curative efficiencies of therapeutic strategies mitigating radiation toxicity might be dependent on the gender of patients, thus simvastatin or HFD might be specifically useful for fighting against radiation toxicity in a sex-dependent fashion partly based on sex-distinct gut microbiota composition in preclinical settings.
| S-EPMC6839645 | biostudies-literature
Project description:Accidental or iatrogenic ionizing radiation exposure precipitates acute and chronic radiation injuries. Traditional paradigm of mitigating radiotherapy-associated side effects has ignored the gender-specific dimorphism of patients. Here we examined the effects of sexual dimorphism on therapeutic agent efficiencies in murine models. High-throughput sequencing showed that different treatments preserved miRNA expression profile in small intestines of male or female mice, respectively. Collectively, our observations demonstrate that therapeutic strategy efficiencies for radiation toxicity might be dependent on the gender of patients. We aim to uncover the underlying mechanisms by which simvastatin or high fat diet fights against radiotherapy-induced gastrointestinal tract toxicity for male or female mice. The mice were exposed to 12 Gy total abdominal irradiation (TAI), then treated with simvastatin for male mice or fed with high fat diet for female mice. The small intestine tissues were extracted from male mice without TAI, exposed to TAI only, and exposed to TAI combined with simvastatin treatment as one cohort, and from female mice without TAI, exposed to TAI only, and exposed to TAI combined with high fat diet feeding as the other cohort.
2020-01-25 | GSE126506 | GEO
Project description:Accidental or iatrogenic ionizing radiation exposure precipitates acute and chronic radiation injuries. Traditional paradigm of mitigating radiotherapy-associated side effects has ignored the gender-specific dimorphism of patients. Here we examined the effects of sexual dimorphism on therapeutic agent efficiencies in murine models. High-throughput sequencing of host mRNA showed that different treatments reprogrammed the spectrum of mRNA expression in small intestines of male or female mice, respectively. Collectively, our observations demonstrate that therapeutic strategy efficiencies for radiation toxicity might be dependent on the gender of patients. We aim to uncover the underlying mechanisms by which simvastatin or high fat diet fights against radiotherapy-induced gastrointestinal tract toxicity for male or female mice. The mice were exposed to 12 Gy total abdominal irradiation (TAI), then treated with simvastatin for male mice or fed with high fat diet for female mice. The small intestine tissues were extracted from male mice without TAI, exposed to TAI only, and exposed to TAI combined with simvastatin treatment as one cohort, and from female mice without TAI, exposed to TAI only, and exposed to TAI combined with high fat diet feeding as the other cohort.
2020-01-25 | GSE126507 | GEO
Project description:Sexual dimorphism of gut microbiota dictates therapeutics efficacy of radiation injuries
| PRJNA522239 | ENA
Project description:Sexual dimorphism of gut microbiota dictates therapeutics efficacy of radiation injuries [RNA-seq]
| PRJNA522242 | ENA
Project description:Sexual dimorphism of gut microbiota dictates therapeutics efficacy of radiation injuries [miRNA-seq]
| PRJNA522243 | ENA
Project description:IntroductionWith the mounting number of cancer survivors, the complications following cancer treatment become novel conundrums and starve for countermeasures. Intravenous immunoglobulin (IVIg) is a purified preparation for immune-deficient and autoimmune conditions.ObjectivesHere, we investigated whether IVIg could be employed to fight against radiation injuries and explored the underlying mechanism.MethodsHematopoietic or gastrointestinal (GI) tract toxicity was induced by total body or abdominal local irradiation. High-throughput sequencing was performed to analyze the gut microbiota configurations and gene expression profile of small intestine. The untargeted metabolomics of gut microbiome was assessed by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) analyses. Hydrodynamic-based gene delivery was used to knockdown the target genes in vivo.ResultsIntravenous injection of IVIg protected against radiation-induced hematopoietic and GI tract toxicity in female mice but not in males. IVIg structured sex-characteristic gut microbiota configurations in abdominal irradiated mice. The irradiation enriched gut Lachnospiraceae in female mice but reduced those in males. IVIg injection combined with oral gavage of Lachnospiraceae or its metabolite hypoxanthine, alleviated radiation toxicity in male mice however, Lachnospiraceae or hypoxanthine alone failed to ameliorate the injuries. Abdominal local irradiation drove sex-distinct gene expression signatures in small intestine. Mechanistic investigation showed that replenishment of Lachnospiraceae or hypoxanthine offset abdominal radiation-reduced PLD1 expression in male mice. In females, irradiation elevated PLD1 expression. Deletion of PLD1 in GI tract of female mice erased the radioprotective effects of IVIg.ConclusionIVIg battles against radiation injuries in a sex-specific, gut microbiome-dependent way through Lachnospiraceae/hypoxanthine/PLD1 axis. Our findings provide a sex-precise therapeutic avenue to improve the prognosis of cancer patients with radiotherapy in pre-clinical settings.
| S-EPMC10105085 | biostudies-literature
Project description:BackgroundAccumulating evidence infer that gut microbiome-host relations are key mediators or modulators driving the observed sexual dimorphism in some disease onset and progression. To date, the sex-differences of gut microbiota at different pubertal status have not been reported.ObjectiveTo determine the characteristics of gut microbiota of both genders at different pubertal status.MethodsGut microbiota was analyzed in 89 Chinese participants aged 5-15 years. Participants were divided into pre-puberty and puberty groups for both male and female. The composition of gut microbiota was investigated by 16S rRNA-based metagenomics. Ecological representations of microbial communities were computed. The prediction of metagenomic functional content from 16S rRNA gene surveys was conducted.ResultsThere were 49 males (9.76 ± 2.15 years) and 40 females (9.74 ± 1.63 years); 21 males and 26 females were at puberty. At genus level, Alistipes, Megamonas, Oscillospira and Parabacteroides were more prevalent in girls than in boys (p < 0.05). There were no significantly differences of alpha-diversity between genders, which was independent of pubertal status. The beta-diversity was significantly different in pubertal subjects between genders. Using statistical analyses, we assigned genera Dorea, Megamonas, Bilophila, Parabacteroides and Phascolarctobacterium as microbial markers for pubertal subjects. The predicted metabolic profiles differ in both pubertal and pre-pubertal groups between genders.ConclusionThis cross-sectional study revealed that sex differences in the gut microbiota composition and predicted metabolic profiles exist before puberty, which become more significant at puberty. The identification of novel puberty bacterial markers may disclose a potential effects of gender-related microbiota profiles on puberty onset.
| S-EPMC7390191 | biostudies-literature
Project description:BackgroundGonadal steroid hormones have been suggested as the underlying mechanism responsible for the sexual dimorphism observed in metabolic diseases. Animal studies have also evidenced a causal role of the gut microbiome and metabolic health. However, the role of sexual dimorphism in the gut microbiota and the potential role of the microbiome in influencing sex steroid hormones and shaping sexually dimorphic susceptibility to disease have been largely overlooked. Although there is some evidence of sex-specific differences in the gut microbiota diversity, composition, and functionality, the results are inconsistent. Importantly, most of these studies have not taken into account the gonadal steroid status. Therefore, we investigated the gut microbiome composition and functionality in relation to sex, menopausal status, and circulating sex steroids.ResultsNo significant differences were found in alpha diversity indices among pre- and post-menopausal women and men, but beta diversity differed among groups. The gut microbiota from post-menopausal women was more similar to men than to pre-menopausal women. Metagenome functional analyses revealed no significant differences between post-menopausal women and men. Gonadal steroids were specifically associated with these differences. Hence, the gut microbiota of pre-menopausal women was more enriched in genes from the steroid biosynthesis and degradation pathways, with the former having the strongest fold change among all associated pathways. Microbial steroid pathways also had significant associations with the plasma levels of testosterone and progesterone. In addition, a specific microbiome signature was able to predict the circulating testosterone levels at baseline and after 1-year follow-up. In addition, this microbiome signature could be transmitted from humans to antibiotic-induced microbiome-depleted male mice, being able to predict donor's testosterone levels 4 weeks later, implying that the microbiota profile of the recipient mouse was influenced by the donor's gender. Finally, obesity eliminated most of the differences observed among non-obese pre-menopausal women, post-menopausal women, and men in the gut microbiota composition (Bray-Curtis and weighted unifrac beta diversity), functionality, and the gonadal steroid status.ConclusionsThe present findings evidence clear differences in the gut microbial composition and functionality between men and women, which is eliminated by both menopausal and obesity status. We also reveal a tight link between the gut microbiota composition and the circulating levels of gonadal steroids, particularly testosterone. Video Abstract.
| S-EPMC7504665 | biostudies-literature
Project description:The gut microbiota forms a complex microecosystem in vertebrates and is affected by various factors. As a key intrinsic factor, sex has a persistent impact on the formation and development of gut microbiota. Few studies have analyzed sexual dimorphism of gut microbiota, particularly in wild animals. We used 16S rRNA gene sequencing to analyze the gut microbiota of juvenile and adult Chinese alligators, and untargeted metabolomics to study serum metabolomes of adult alligators. We observed significant sexual differences in the community diversity in juvenile, but not adult, alligators. In terms of taxonomic composition, the phylum Fusobacteriota and genus Cetobacterium were highly abundant in adult alligators, similar to those present in carnivorous fishes, whereas the gut microbiota composition in juvenile alligators resembled that in terrestrial reptiles, indicating that adults are affected by their wild aquatic environment and lack sex dimorphism in gut microbiota. The correlation analysis revealed that the gut microbiota of adults was also affected by cyanobacteria in the external environment, and this effect was sex-biased and mediated by sex hormones. Overall, this study reveals sexual differences in the gut microbiota of crocodilians and their convergence in the external environment, while also providing insights into host-microbiota interactions in wildlife.
| S-EPMC9603114 | biostudies-literature