RESUMEN
BACKGROUND: At present, a number of clinical trials have been carried out on GLP-1 receptor agonist liraglutide in the treatment of polycystic ovary syndrome (PCOS). However, the effect of liraglutide on follicle development and its specific mechanism are still unclear. METHODS: RNA sequencing was used to explore the molecular characteristics of granulosa cells from patients with PCOS treated with liraglutide. The levels of C-X-C motif chemokine ligand 10 (CXCL10) in follicular fluid were detected by ELISA, the expression levels of ovulation related genes and inflammatory factor genes in follicles and granulosa cells were detected by qPCR and the protein levels of connexin 43 (Cx43), Janus Kinase 2 (JAK2) and phosphorylated JAK2 were detected by Western blot. The mouse ovarian follicles culture system in vitro was used to detect the status of follicle development and ovulation. RESULTS: In the present study, we found that liraglutide inhibited the secretion of inflammatory factors in PCOS granulosa cells, among which CXCL10 was the most significant. In addition, CXCL10 was significantly higher in granulosa cells and follicular fluid in PCOS patients than in non-PCOS patients. We applied in vitro follicle culture and other techniques to carry out the mechanism exploration which revealed that CXCL10 disrupted the homeostasis of gap junction protein alpha 1 (GJA1) between oocyte and granulosa cells before physiological ovulation, thus inhibiting follicular development and ovulation. Liraglutide inhibited CXCL10 secretion in PCOS granulosa cells by inhibiting the JAK signaling pathway and can improved dehydroepiandrosterone (DHEA)-induced follicle development disorders, which is reversed by CXCL10 supplementation. CONCLUSIONS: The present study suggests that liraglutide inhibits CXCL10 secretion in granulosa cells through JAK signaling pathway, thereby improving the homeostasis of GJA1 between oocyte and granulosa cells before physiological ovulation and ultimately improving the follicular development and ovulation of PCOS, which provides more supportive evidence for the clinical application of liraglutide in the treatment of ovulatory disorders in PCOS. TRIAL REGISTRATION: Not applicable.
Asunto(s)
Quimiocina CXCL10 , Células de la Granulosa , Liraglutida , Folículo Ovárico , Síndrome del Ovario Poliquístico , Síndrome del Ovario Poliquístico/metabolismo , Síndrome del Ovario Poliquístico/tratamiento farmacológico , Femenino , Liraglutida/farmacología , Liraglutida/uso terapéutico , Quimiocina CXCL10/metabolismo , Quimiocina CXCL10/genética , Humanos , Folículo Ovárico/efectos de los fármacos , Folículo Ovárico/metabolismo , Animales , Ratones , Células de la Granulosa/efectos de los fármacos , Células de la Granulosa/metabolismo , Adulto , Ovulación/efectos de los fármacos , Líquido Folicular/metabolismo , Células Cultivadas , Hipoglucemiantes/farmacología , Hipoglucemiantes/uso terapéuticoRESUMEN
Non-alcoholic steatohepatitis (NASH) is a severe type of the non-alcoholic fatty liver disease (NAFLD). NASH is a growing global health concern due to its increasing morbidity, lack of well-defined biomarkers and lack of clinically effective treatments. Using metabolomic analysis, the most significantly changed active lipid sphingosine d18:1 [So(d18:1)] is selected from NASH patients. So(d18:1) inhibits macrophage HIF-2α as a direct inhibitor and promotes the inflammatory factors secretion. Male macrophage-specific HIF-2α knockout and overexpression mice verified the protective effect of HIF-2α on NASH progression. Importantly, the HIF-2α stabilizer FG-4592 alleviates liver inflammation and fibrosis in NASH, which indicated that macrophage HIF-2α is a potential drug target for NASH treatment. Overall, this study confirms that So(d18:1) promotes NASH and clarifies that So(d18:1) inhibits the transcriptional activity of HIF-2α in liver macrophages by suppressing the interaction of HIF-2α with ARNT, suggesting that macrophage HIF-2α may be a potential target for the treatment of NASH.
Asunto(s)
Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico , Macrófagos , Ratones Noqueados , Enfermedad del Hígado Graso no Alcohólico , Esfingosina , Enfermedad del Hígado Graso no Alcohólico/metabolismo , Enfermedad del Hígado Graso no Alcohólico/tratamiento farmacológico , Enfermedad del Hígado Graso no Alcohólico/patología , Enfermedad del Hígado Graso no Alcohólico/genética , Animales , Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico/metabolismo , Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico/genética , Masculino , Macrófagos/metabolismo , Macrófagos/efectos de los fármacos , Humanos , Ratones , Esfingosina/análogos & derivados , Esfingosina/metabolismo , Hígado/metabolismo , Hígado/patología , Hígado/efectos de los fármacos , Ratones Endogámicos C57BL , Translocador Nuclear del Receptor de Aril Hidrocarburo/metabolismo , Translocador Nuclear del Receptor de Aril Hidrocarburo/genética , Cirrosis Hepática/metabolismo , Cirrosis Hepática/tratamiento farmacológico , Cirrosis Hepática/patología , Cirrosis Hepática/genética , Modelos Animales de EnfermedadRESUMEN
Polycystic ovary syndrome (PCOS), an endocrine disorder afflicting 6-20% of women of reproductive age globally, has been linked to alterations in the gut microbiome. We previously showed that in PCOS, elevation of Bacteroides vulgatus in the gut microbiome was associated with altered bile acid metabolism. Here we show that B. vulgatus also induces a PCOS-like phenotype in female mice via an alternate mechanism independent of bile acids. We find that B. vulgatus contributes to PCOS-like symptoms through its metabolite agmatine, which is derived from arginine by arginine decarboxylase. Mechanistically, agmatine activates the farnesoid X receptor (FXR) pathway to subsequently inhibit glucagon-like peptide-1 (GLP-1) secretion by L cells, which leads to insulin resistance and ovarian dysfunction. Critically, the GLP-1 receptor agonist liraglutide and the arginine decarboxylase inhibitor difluoromethylarginine ameliorate ovarian dysfunction in a PCOS-like mouse model. These findings reveal that agmatine-FXR-GLP-1 signalling contributes to ovarian dysfunction, presenting a potential therapeutic target for PCOS management.
Asunto(s)
Agmatina , Microbioma Gastrointestinal , Síndrome del Ovario Poliquístico , Receptores Citoplasmáticos y Nucleares , Síndrome del Ovario Poliquístico/tratamiento farmacológico , Síndrome del Ovario Poliquístico/metabolismo , Animales , Femenino , Ratones , Agmatina/farmacología , Agmatina/metabolismo , Agmatina/uso terapéutico , Receptores Citoplasmáticos y Nucleares/agonistas , Receptores Citoplasmáticos y Nucleares/metabolismo , Microbioma Gastrointestinal/efectos de los fármacos , Péptido 1 Similar al Glucagón/metabolismo , Transducción de Señal/efectos de los fármacos , Modelos Animales de Enfermedad , Resistencia a la Insulina , Bacteroides/efectos de los fármacos , Humanos , Carboxiliasas/metabolismoRESUMEN
The gut microbiota is closely linked to atherosclerosis. However, the role of intestinal fungi, essential members of the complex microbial community, in atherosclerosis is poorly understood. Herein, we show that gut fungi dysbiosis is implicated in patients with dyslipidemia, characterized by higher levels of Candida albicans (C. albicans), which are positively correlated with plasma total cholesterol and low-density lipoprotein-cholesterol (LDL-C) levels. Furthermore, C. albicans colonization aggravates atherosclerosis progression in a mouse model of the disease. Through gain- and loss-of-function studies, we show that an intestinal hypoxia-inducible factor 2α (HIF-2α)-ceramide pathway mediates the effect of C. albicans. Mechanistically, formyl-methionine, a metabolite of C. albicans, activates intestinal HIF-2α signaling, which drives increased ceramide synthesis to accelerate atherosclerosis. Administration of the HIF-2α selective antagonist PT2385 alleviates atherosclerosis in mice by reducing ceramide levels. Our findings identify a role for intestinal fungi in atherosclerosis progression and highlight the intestinal HIF-2α-ceramide pathway as a target for atherosclerosis treatment.
Asunto(s)
Aterosclerosis , Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico , Candida albicans , Ceramidas , Transducción de Señal , Animales , Candida albicans/metabolismo , Aterosclerosis/microbiología , Aterosclerosis/metabolismo , Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico/metabolismo , Ratones , Humanos , Ceramidas/metabolismo , Modelos Animales de Enfermedad , Ratones Endogámicos C57BL , Masculino , Microbioma Gastrointestinal/fisiología , Intestinos/microbiología , Intestinos/patología , Disbiosis/microbiología , Femenino , Candidiasis/microbiología , Candidiasis/metabolismoRESUMEN
BACKGROUND: Polycystic ovary syndrome (PCOS) is a reproductive endocrine disorder with multiple metabolic abnormalities. Most PCOS patients have concomitant metabolic syndromes such as insulin resistance and obesity, which often lead to the development of type II diabetes and cardiovascular disease with serious consequences. Current treatment of PCOS with symptomatic treatments such as hormone replacement, which has many side effects. Research on its origin and pathogenesis is urgently needed. Although improving the metabolic status of the body can alleviate reproductive function in some patients, there is still a subset of patients with metabolically normal PCOS that lacks therapeutic tools to address ovarian etiology. METHODS: The effect of IL-22 on PCOS ovarian function was verified in a non-metabolic PCOS mouse model induced by dehydroepiandrosterone (DHEA) and rosiglitazone, as well as granulosa cell -specific STAT3 knockout (Fshrcre+Stat3f/f) mice (10 groups totally and n = 5 per group). Mice were maintained under controlled temperature and lighting conditions with free access to food and water in a specific pathogen-free (SPF) facility. Secondary follicles separated from Fshrcre+Stat3f/f mice were cultured in vitro with DHEA to mimic the hyperandrogenic environment in PCOS ovaries (4 groups and n = 7 per group) and then were treated with IL-22 to investigate the specific role of IL-22 on ovarian function. RESULTS: We developed a non-metabolic mice model with rosiglitazone superimposed on DHEA. This model has normal metabolic function as evidenced by normal glucose tolerance without insulin resistance and PCOS-like ovarian function as evidenced by irregular estrous cycle, polycystic ovarian morphology (PCOM), abnormalities in sex hormone level. Supplementation with IL-22 improved these ovarian functions in non-metabolic PCOS mice. Application of DHEA in an in vitro follicular culture system to simulate PCOS follicular developmental block and ovulation impairment. Follicles from Fshrcre+Stat3f/f did not show improvement in POCS follicle development with the addition of IL-22. In DHEA-induced PCOS mice, selective ablation of STAT3 in granulosa cells significantly reversed the ameliorative effect of IL-22 on ovarian function. CONCLUSION: IL-22 can improve non-metabolic PCOS mice ovarian function. Granulosa cells deficient in STAT3 reverses the role of IL-22 in alleviating ovary dysfunction in non-metabolic PCOS mice.
Asunto(s)
Modelos Animales de Enfermedad , Interleucina-22 , Ovario , Síndrome del Ovario Poliquístico , Animales , Femenino , Ratones , Deshidroepiandrosterona/farmacología , Células de la Granulosa/metabolismo , Interleucina-22/farmacología , Interleucinas/metabolismo , Interleucinas/genética , Ratones Noqueados , Ovario/efectos de los fármacos , Ovario/metabolismo , Ovario/patología , Síndrome del Ovario Poliquístico/tratamiento farmacológico , Síndrome del Ovario Poliquístico/metabolismo , Rosiglitazona/farmacología , Rosiglitazona/uso terapéutico , Factor de Transcripción STAT3/metabolismoRESUMEN
A strong correlation between gut microbes and host health has been observed in numerous gut metagenomic cohort studies. However, the underlying mechanisms governing host-microbe interactions in the gut remain largely unknown. Here we report that the gut commensal Christensenella minuta modulates host metabolism by generating a previously undescribed class of secondary bile acids with 3-O-acylation substitution that inhibit the intestinal farnesoid X receptor. Administration of C. minuta alleviated features of metabolic disease in high fat diet-induced obese mice associated with a significant increase in these acylated bile acids, which we refer to as 3-O-acyl-cholic acids. Specific knockout of intestinal farnesoid X receptor in mice counteracted the beneficial effects observed in their wild-type counterparts. Finally, we showed that 3-O-acyl-CAs were prevalent in healthy humans but significantly depleted in patients with type 2 diabetes. Our findings indicate a role for C. minuta and acylated bile acids in metabolic diseases.
Asunto(s)
Ácidos y Sales Biliares , Diabetes Mellitus Tipo 2 , Humanos , Animales , Ratones , Clostridiales , Dieta Alta en GrasaRESUMEN
A mechanistic understanding of how microbial proteins affect the host could yield deeper insights into gut microbiota-host cross-talk. We developed an enzyme activity-screening platform to investigate how gut microbiota-derived enzymes might influence host physiology. We discovered that dipeptidyl peptidase 4 (DPP4) is expressed by specific bacterial taxa of the microbiota. Microbial DPP4 was able to decrease the active glucagon like peptide-1 (GLP-1) and disrupt glucose metabolism in mice with a leaky gut. Furthermore, the current drugs targeting human DPP4, including sitagliptin, had little effect on microbial DPP4. Using high-throughput screening, we identified daurisoline-d4 (Dau-d4) as a selective microbial DPP4 inhibitor that improves glucose tolerance in diabetic mice.
Asunto(s)
Bacteroides , Diabetes Mellitus Tipo 2 , Dipeptidil Peptidasa 4 , Inhibidores de la Dipeptidil-Peptidasa IV , Microbioma Gastrointestinal , Interacciones Microbiota-Huesped , Hipoglucemiantes , Animales , Humanos , Ratones , Bacteroides/efectos de los fármacos , Bacteroides/enzimología , Bacteroides/genética , Diabetes Mellitus Tipo 2/enzimología , Diabetes Mellitus Tipo 2/microbiología , Dipeptidil Peptidasa 4/metabolismo , Inhibidores de la Dipeptidil-Peptidasa IV/farmacología , Inhibidores de la Dipeptidil-Peptidasa IV/uso terapéutico , Heces/microbiología , Péptido 1 Similar al Glucagón/metabolismo , Glucosa/metabolismo , Isoenzimas/metabolismo , Fosfato de Sitagliptina/farmacología , Fosfato de Sitagliptina/uso terapéutico , Hipoglucemiantes/farmacología , Hipoglucemiantes/uso terapéuticoRESUMEN
Thyroid hormones (TH) regulate systemic glucose metabolism through incompletely understood mechanisms. Here, we show that improved glucose metabolism in hypothyroid mice after T3 treatment is accompanied with increased glucagon-like peptide-1 (GLP-1) production and insulin secretion, while co-treatment with a GLP-1 receptor antagonist attenuates the effects of T3 on insulin and glucose levels. By using mice lacking hepatic TH receptor ß (TRß) and a liver-specific TRß-selective agonist, we demonstrate that TRß-mediated hepatic TH signalling is required for both the regulation of GLP-1 production and the insulinotropic and glucose-lowering effects of T3. Moreover, administration of a liver-targeted TRß-selective agonist increases GLP-1 and insulin levels and alleviates hyperglycemia in diet-induced obesity. Mechanistically, T3 suppresses Cyp8b1 expression, resulting in increased the levels of Farnesoid X receptor (FXR)-antagonistic bile acids, thereby potentiating GLP-1 production and insulin secretion by repressing intestinal FXR signalling. T3 correlates with both plasma GLP-1 and fecal FXR-antagonistic bile acid levels in people with normal thyroid function. Thus, our study reveals a role for hepatic TH signalling in glucose homeostasis through the regulation of GLP-1 production via bile acid-mediated FXR antagonism.
Asunto(s)
Ácidos y Sales Biliares , Péptido 1 Similar al Glucagón , Animales , Ratones , Péptido 1 Similar al Glucagón/metabolismo , Glucosa , Homeostasis , Insulina , Hígado/metabolismo , Ratones Endogámicos C57BL , Receptores Citoplasmáticos y Nucleares , Receptores Acoplados a Proteínas G/metabolismo , Hormonas Tiroideas , Proteína de la Discapacidad Intelectual del Síndrome del Cromosoma X Frágil/antagonistas & inhibidoresRESUMEN
Polycystic ovary syndrome (PCOS) is a common reproductive endocrine disease in women of reproductive age. Ovarian dysfunction including abnormal steroid hormone synthesis and follicular arrest play a vital role in PCOS pathogenesis. Hyperandrogenemia is one of the important characteristics of PCOS. However, the mechanism of regulation and interaction between hyperandrogenism and ovulation abnormalities are not clear. To investigate androgen-related metabolic state in granulosa cells of PCOS patients, we identified the transcriptome characteristics of PCOS granulosa cells by RNA-seq. Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis of differentially expressed genes (DEGs) revealed that genes enriched in lipid metabolism pathway, fatty acid biosynthetic process and ovarian steroidogenesis pathway were abnormally expressed in PCOS granulosa cells in comparison with that in control. There are close interactions among these three pathways as identified by analysis of the protein-protein interaction (PPI) network of DEGs. Furthermore, in vitro mouse follicle culture system was established to explore the effect of high androgen and its related metabolic dysfunction on follicular growth and ovulation. RT-qPCR results showed that follicles cultured with dehydroepiandrosterone (DHEA) exhibited decreased expression levels of cumulus expansion-related genes (Has2, Ptx3, Tnfaip6 and Adamts1) and oocyte maturation-related genes (Gdf9 and Bmp15), which may be caused by impaired steroid hormone synthesis and lipid metabolism, thus inhibited follicular development and ovulation. Furthermore, the inhibition effect of DHEA on follicle development and ovulation was ameliorated by flutamide, an androgen receptor (AR) antagonist, suggesting the involvement of AR signaling. In summary, our study offers new insights into understanding the role of androgen excess induced granulosa cell metabolic disorder in ovarian dysfunction of PCOS patients.
Asunto(s)
Andrógenos , Síndrome del Ovario Poliquístico , Andrógenos/farmacología , Animales , Deshidroepiandrosterona , Femenino , Células de la Granulosa , Humanos , Ratones , Síndrome del Ovario Poliquístico/metabolismo , EsteroidesRESUMEN
The interrelation between hypoxia and immune response has pivotal roles in the pathogenesis of chronic metabolic diseases. However, the role of macrophage HIF-2α in NLRP3 inflammasome activation remains unclear. Here, we show that deficiency of HIF-2α in macrophages results in excessive activation of the NLRP3 inflammasome in a manner dependent on CPT1A-mediated enhancement of fatty acid oxidation (FAO). Mechanistically, HIF-2α binds directly to the Cpt1a promoter and is involved in the regulation of H3K27me3 methylation during NLRP3 inflammasome activation. Myeloid-specific Hif2α knockout mice exhibit exacerbated insulin resistance and increased activation of NLRP3 inflammasome in macrophages. Overexpression of the Hif2α gene or stabilization of the protein by FG-4592 ameliorates insulin resistance and reduces NLRP3 inflammasome activation in macrophages. Taken together, our results suggest that macrophage HIF-2α inhibits FAO-mediated activation of the NLRP3 inflammasome and alleviates insulin resistance.
Asunto(s)
Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico/metabolismo , Inflamasomas/metabolismo , Resistencia a la Insulina/fisiología , Macrófagos/metabolismo , Proteína con Dominio Pirina 3 de la Familia NLR/metabolismo , Animales , Humanos , Metabolismo de los Lípidos/fisiología , RatonesRESUMEN
Intestinal farnesoid X receptor (FXR) signaling is involved in the development of obesity, fatty liver disease, and type 2 diabetes. However, the role of intestinal FXR in atherosclerosis and its potential as a target for clinical treatment have not been explored. The serum levels of fibroblast growth factor 19 (FGF19), which is encoded by an FXR target gene, were much higher in patients with hypercholesterolemia than in control subjects and were positively related to circulating ceramide levels, indicating a link between intestinal FXR, ceramide metabolism, and atherosclerosis. Among ApoE-/- mice fed a high-cholesterol diet (HCD), intestinal FXR deficiency (in FxrΔIE ApoE-/- mice) or direct FXR inhibition (via treatment with the FXR antagonist glycoursodeoxycholic acid [GUDCA]) decreased atherosclerosis and reduced the levels of circulating ceramides and cholesterol. Sphingomyelin phosphodiesterase 3 (SMPD3), which is involved in ceramide synthesis in the intestine, was identified as an FXR target gene. SMPD3 overexpression or C16:0 ceramide supplementation eliminated the improvements in atherosclerosis in FxrΔIE ApoE-/- mice. Administration of GUDCA or GW4869, an SMPD3 inhibitor, elicited therapeutic effects on established atherosclerosis in ApoE-/- mice by decreasing circulating ceramide levels. This study identified an intestinal FXR/SMPD3 axis that is a potential target for atherosclerosis therapy.
Asunto(s)
Aterosclerosis , Ceramidas/biosíntesis , Mucosa Intestinal/metabolismo , Receptores Citoplasmáticos y Nucleares/metabolismo , Esfingomielina Fosfodiesterasa/metabolismo , Ácido Ursodesoxicólico/análogos & derivados , Animales , Aterosclerosis/inducido químicamente , Aterosclerosis/tratamiento farmacológico , Aterosclerosis/genética , Aterosclerosis/metabolismo , Ceramidas/genética , Dieta Alta en Grasa/efectos adversos , Femenino , Humanos , Masculino , Ratones , Ratones Noqueados para ApoE , Receptores Citoplasmáticos y Nucleares/antagonistas & inhibidores , Receptores Citoplasmáticos y Nucleares/genética , Esfingomielina Fosfodiesterasa/genética , Ácido Ursodesoxicólico/farmacologíaRESUMEN
As the gut microbiota exerts various effects on the intestinal milieu which influences distant organs and pathways, it is considered to be a full-fledged endocrine organ. The microbiota plays a major role in the reproductive endocrine system throughout a woman's lifetime by interacting with estrogen, androgens, insulin, and other hormones. Imbalance of the gut microbiota composition can lead to several diseases and conditions, such as pregnancy complications, adverse pregnancy outcomes, polycystic ovary syndrome (PCOS), endometriosis, and cancer; however, research on the mechanisms is limited. More effort should be concentrated on exploring the potential causes and underlying the mechanisms of microbiota-hormone-mediated disease, and providing novel therapeutic and preventive strategies.As the gut microbiota exerts various effects on the intestinal milieu which influences distant organs and pathways, it is considered to be a full-fledged endocrine organ. The microbiota plays a major role in the reproductive endocrine system throughout a woman's lifetime by interacting with estrogen, androgens, insulin, and other hormones. Imbalance of the gut microbiota composition can lead to several diseases and conditions, such as pregnancy complications, adverse pregnancy outcomes, polycystic ovary syndrome (PCOS), endometriosis, and cancer; however, research on the mechanisms is limited. More effort should be concentrated on exploring the potential causes and underlying the mechanisms of microbiota-hormone-mediated disease, and providing novel therapeutic and preventive strategies.
Asunto(s)
Sistema Endocrino/fisiología , Microbioma Gastrointestinal/fisiología , Enfermedades de los Genitales Femeninos/microbiología , Genitales Femeninos/fisiología , Complicaciones del Embarazo/microbiología , Andrógenos/metabolismo , Sistema Endocrino/metabolismo , Estrógenos/metabolismo , Femenino , Hormonas/metabolismo , Humanos , Insulina/metabolismo , EmbarazoRESUMEN
Polycystic ovary syndrome (PCOS) is a complex syndrome involving both endocrine and metabolic disorders. Gut microbiota and the intestinal immune factor IL-22 play an important role in the pathogenesis of PCOS. However, the therapeutic role of IL-22 in high androgen-induced PCOS mice is not clear. We aimed to determine the therapeutic effects of IL-22 on the DHEA-induced PCOS mouse model and to explore the possible mechanism of IL-22 in regulating hyperandrogenism-associated PCOS. Insulin resistance levels and ovarian functions were investigated in DHEA-induced PCOS mice with or without additional IL-22 treatment. We found that IL-22 could reverse insulin resistance, disturbed estrous cycle, abnormal ovary morphology, and decreased embryo number in DHEA mice. Mechanistically, IL-22 upregulated the browning of white adipose tissue in DHEA mice. This study demonstrated that IL-22-associated browning of white adipose tissue regulated insulin sensitivity and ovarian functions in PCOS, suggesting that IL-22 may be of value for the treatment of PCOS with a hyperandrogenism phenotype.
Asunto(s)
Interleucinas/farmacología , Síndrome del Ovario Poliquístico/tratamiento farmacológico , Andrógenos , Animales , Modelos Animales de Enfermedad , Ciclo Estral/efectos de los fármacos , Femenino , Hiperandrogenismo/inducido químicamente , Hiperandrogenismo/complicaciones , Resistencia a la Insulina/fisiología , Ratones , Ovario/fisiopatología , Síndrome del Ovario Poliquístico/inducido químicamente , Síndrome del Ovario Poliquístico/fisiopatología , Interleucina-22RESUMEN
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
RESUMEN
Polycystic ovary syndrome (PCOS) is characterized by androgen excess, ovulatory dysfunction and polycystic ovaries1, and is often accompanied by insulin resistance2. The mechanism of ovulatory dysfunction and insulin resistance in PCOS remains elusive, thus limiting the development of therapeutics. Improved metabolic health is associated with a relatively high microbiota gene content and increased microbial diversity3,4. This study aimed to investigate the impact of the gut microbiota and its metabolites on the regulation of PCOS-associated ovarian dysfunction and insulin resistance. Here, we report that Bacteroides vulgatus was markedly elevated in the gut microbiota of individuals with PCOS, accompanied by reduced glycodeoxycholic acid and tauroursodeoxycholic acid levels. Transplantation of fecal microbiota from women with PCOS or B. vulgatus-colonized recipient mice resulted in increased disruption of ovarian functions, insulin resistance, altered bile acid metabolism, reduced interleukin-22 secretion and infertility. Mechanistically, glycodeoxycholic acid induced intestinal group 3 innate lymphoid cell IL-22 secretion through GATA binding protein 3, and IL-22 in turn improved the PCOS phenotype. This finding is consistent with the reduced levels of IL-22 in individuals with PCOS. This study suggests that modifying the gut microbiota, altering bile acid metabolism and/or increasing IL-22 levels may be of value for the treatment of PCOS.
Asunto(s)
Ácidos y Sales Biliares/metabolismo , Factor de Transcripción GATA3/fisiología , Microbioma Gastrointestinal , Interleucinas/fisiología , Síndrome del Ovario Poliquístico/etiología , Animales , Femenino , Humanos , Inflamación/complicaciones , Resistencia a la Insulina , Ratones , Ratones Endogámicos C57BL , Ovario/fisiopatología , Síndrome del Ovario Poliquístico/fisiopatología , Interleucina-22RESUMEN
The anti-hyperglycemic effect of metformin is believed to be caused by its direct action on signaling processes in hepatocytes, leading to lower hepatic gluconeogenesis. Recently, metformin was reported to alter the gut microbiota community in humans, suggesting that the hyperglycemia-lowering action of the drug could be the result of modulating the population of gut microbiota. However, the critical microbial signaling metabolites and the host targets associated with the metabolic benefits of metformin remained elusive. Here, we performed metagenomic and metabolomic analysis of samples from individuals with newly diagnosed type 2 diabetes (T2D) naively treated with metformin for 3 d, which revealed that Bacteroides fragilis was decreased and the bile acid glycoursodeoxycholic acid (GUDCA) was increased in the gut. These changes were accompanied by inhibition of intestinal farnesoid X receptor (FXR) signaling. We further found that high-fat-diet (HFD)-fed mice colonized with B. fragilis were predisposed to more severe glucose intolerance, and the metabolic benefits of metformin treatment on glucose intolerance were abrogated. GUDCA was further identified as an intestinal FXR antagonist that improved various metabolic endpoints in mice with established obesity. Thus, we conclude that metformin acts in part through a B. fragilis-GUDCA-intestinal FXR axis to improve metabolic dysfunction, including hyperglycemia.