Gut microbiome and serum metabolome analyses identify molecular biomarkers and altered glutamate metabolism in fibromyalgia.

BACKGROUND: Fibromyalgia is a complex, relatively unknown disease characterised by chronic, widespread musculoskeletal pain. The gut-brain axis connects the gut microbiome with the brain through the enteric nervous system (ENS); its disruption has been associated with psychiatric and gastrointestinal disorders. To gain an insight into the pathogenesis of fibromyalgia and identify diagnostic biomarkers, we combined different omics techniques to analyse microbiome and serum composition. METHODS: We collected faeces and blood samples to study the microbiome, the serum metabolome and circulating cytokines and miRNAs from a cohort of 105 fibromyalgia patients and 54 age- and environment-matched healthy individuals. We sequenced the V3 and V4 regions of the 16S rDNA gene from faeces samples. UPLC-MS metabolomics and custom multiplex cytokine and miRNA analysis (FirePlex™ technology) were used to examine sera samples. Finally, we combined the different data types to search for potential biomarkers. RESULTS: We found that the diversity of bacteria is reduced in fibromyalgia patients. The abundance of the Bifidobacterium and Eubacterium genera (bacteria participating in the metabolism of neurotransmitters in the host) in these patients was significantly reduced. The serum metabolome analysis revealed altered levels of glutamate and serine, suggesting changes in neurotransmitter metabolism. The combined serum metabolomics and gut microbiome datasets showed a certain degree of correlation, reflecting the effect of the microbiome on metabolic activity. We also examined the microbiome and serum metabolites, cytokines and miRNAs as potential sources of molecular biomarkers of fibromyalgia. CONCLUSIONS: Our results show that the microbiome analysis provides more significant biomarkers than the other techniques employed in the work. Gut microbiome analysis combined with serum metabolomics can shed new light onto the pathogenesis of fibromyalgia. We provide a list of bacteria whose abundance changes in this disease and propose several molecules as potential biomarkers that can be used to evaluate the current diagnostic criteria.

Categorización diagnóstica según los criterios del First International Workshop on Ocular Sarcoidosis (FIWOS) en una serie de 11 pacientes / Diagnostic categorization according to the First International Workshop on Ocular Sarcoidosis (FIWOS) criteria in a series of 11 patients

Objetivo. Categorizar a los pacientes con diagnóstico de sarcoidosis ocular en el período comprendido entre 2009 y 2014. Métodos. Se revisaron las historias clínicas de los pacientes con sarcoidosis ocular y se recopilaron las variables para categorizar a los pacientes según los criterios del FIWOS. Resultados. Se encontró a un total de 11 pacientes con uveítis sarcoidea, 7 mujeres y 4 hombres, con una mediana de edad de 58 años. El patrón de panuveítis bilateral crónica fue el más frecuente en un 54,5%, seguido de la uveítis anterior crónica unilateral, con 27,2%. El diagnóstico de sarcoidosis fue definitivo en 4 pacientes (36,3%), presunto en 5 pacientes (45,4%), probable en un paciente (9%) y posible en un paciente (9%). Conclusiones. Más de la mitad de los pacientes sin biopsia confirmatoria fueron diagnosticados de sarcoidosis ocular. La panuveítis bilateral crónica y la uveítis anterior crónica fueron los patrones predominantes (AU)

Objective. Categorization of patients diagnosed with ocular sarcoidosis during the period 2009-2014. Methods. The medical records of patients with ocular sarcoidosis were reviewed and variables were collected to categorize the patients according to the criteria of the FIWOS. Results. We found 11 patients, 7 women and 4 men, with sarcoid uveitis; the median age was 58 years. Bilateral panuveitis was the most common pattern (54.5%), followed by chronic anterior uveitis (27.2%). The diagnosis of sarcoidosis was definitive in 4 patients (36.3%), presumed in 5 (45.4%), probable in 1 (9%) and possible in 1 (9%). Conclusions. Ocular sarcoidosis was diagnosed in more than half of the patients who had no confirmatory biopsy. Bilateral panuveitis and chronic anterior uveitis were the patterns most frequently observed (AU)

Diagnostic categorization according to the First International Workshop on Ocular Sarcoidosis (FIWOS) criteria in a series of 11 patients. / Categorización diagnóstica según los criterios del First International Workshop on Ocular Sarcoidosis (FIWOS) en una serie de 11 pacientes.

OBJECTIVE: Categorization of patients diagnosed with ocular sarcoidosis during the period 2009-2014. METHODS: The medical records of patients with ocular sarcoidosis were reviewed and variables were collected to categorize the patients according to the criteria of the FIWOS. RESULTS: We found 11 patients, 7 women and 4 men, with sarcoid uveitis; the median age was 58 years. Bilateral panuveitis was the most common pattern (54.5%), followed by chronic anterior uveitis (27.2%). The diagnosis of sarcoidosis was definitive in 4 patients (36.3%), presumed in 5 (45.4%), probable in 1 (9%) and possible in 1 (9%). CONCLUSIONS: Ocular sarcoidosis was diagnosed in more than half of the patients who had no confirmatory biopsy. Bilateral panuveitis and chronic anterior uveitis were the patterns most frequently observed.