VIDEO: Characteristic flora define intestinal microbiome in scleroderma

SANDESTIN, FLA. – Scleroderma patients appear to have a characteristic microbiome composition, which is consistent in samples taken around the world.

These patients showed decreased populations of beneficial commensal flora and increased populations of proinflammatory species, Elizabeth Volkmann, MD, said at the annual Congress of Clinical Rheumatology.

Furthermore, specific species seem to correlate with specific gastrointestinal symptoms, said Dr. Volkmann of the University of California, Los Angeles. “Features also unexpectedly overlap with the consortium typical for Crohn’s disease, a disease with both inflammatory and fibrosing phenotype,” she said.

Her recent exploration of this topic included 17 patients with scleroderma and GI symptoms and 17 matched healthy controls (BMJ Open Gastro. 2017;3:e000134). Everyone underwent a bowel prep and colonoscopy, during which cecum and sigmoid mucosal lavage samples were obtained. Those samples underwent RNA sequencing.

In addition to quantifying the species present, Dr. Volkmann sought to associate populations with symptoms. The primary assessment tool was the GIT 2.0, which measures distention/bloating; diarrhea; fecal soilage; constipation; emotional well-being; and social functioning.

Similar to the findings in inflammatory disease states, scleroderma patients had decreased levels of commensal Clostridia, a class of Firmicutes that is established in early infancy and very important in the maintenance of gut homeostasis. They also showed a decreased proportion of Faecalibacterium, a genus with anti-inflammatory activity; this finding has been observed in patients with Crohn’s disease.

 

Patients also showed relative increases in pathobionts. These are potentially pathological organisms that, under normal circumstances, live symbiotically. Janet Chow, PhD, who coined the term in a 2011 paper, said these species are typically proinflammatory (Curr Opin Immunol. 2011 Aug; 23[4]:473-80).

“Organisms proposed as pathobionts are associated with chronic inflammatory conditions – unlike opportunistic pathogens, which often cause acute infections and are typically acquired from the environment or other parts of the body. In addition, pathobionts are innocuous to the host under normal conditions,” wrote Dr. Chow of the California Institute of Technology, Pasadena.

In Dr. Volkmann’s study, Bifidobacterium and Lactobacillus, which are usually reduced in proinflammatory disorders, were relatively abundant in patients, compared with controls.

 

She noted specific associations with both symptoms. Parabacteroides and Enterobacteriaceae were associated with increased constipation. Prevotella was associated with increased diarrhea and increased distention/bloating.

Her results are consistent with a Swedish study (Arthritis Res Ther. 2016 Nov 1;18[1]:278) and three Italian studies conducted in Rome, Milan, and Piacenza.

“It’s fascinating that we seem to be identifying a consistent microbiome profile for scleroderma patients,” Dr. Volkmann said.

Dr. Volkmann had no relevant financial disclosures.

[email protected]

SANDESTIN, FLA. – Scleroderma patients appear to have a characteristic microbiome composition, which is consistent in samples taken around the world.

These patients showed decreased populations of beneficial commensal flora and increased populations of proinflammatory species, Elizabeth Volkmann, MD, said at the annual Congress of Clinical Rheumatology.

Furthermore, specific species seem to correlate with specific gastrointestinal symptoms, said Dr. Volkmann of the University of California, Los Angeles. “Features also unexpectedly overlap with the consortium typical for Crohn’s disease, a disease with both inflammatory and fibrosing phenotype,” she said.

Her recent exploration of this topic included 17 patients with scleroderma and GI symptoms and 17 matched healthy controls (BMJ Open Gastro. 2017;3:e000134). Everyone underwent a bowel prep and colonoscopy, during which cecum and sigmoid mucosal lavage samples were obtained. Those samples underwent RNA sequencing.

In addition to quantifying the species present, Dr. Volkmann sought to associate populations with symptoms. The primary assessment tool was the GIT 2.0, which measures distention/bloating; diarrhea; fecal soilage; constipation; emotional well-being; and social functioning.

Similar to the findings in inflammatory disease states, scleroderma patients had decreased levels of commensal Clostridia, a class of Firmicutes that is established in early infancy and very important in the maintenance of gut homeostasis. They also showed a decreased proportion of Faecalibacterium, a genus with anti-inflammatory activity; this finding has been observed in patients with Crohn’s disease.

 

Patients also showed relative increases in pathobionts. These are potentially pathological organisms that, under normal circumstances, live symbiotically. Janet Chow, PhD, who coined the term in a 2011 paper, said these species are typically proinflammatory (Curr Opin Immunol. 2011 Aug; 23[4]:473-80).

“Organisms proposed as pathobionts are associated with chronic inflammatory conditions – unlike opportunistic pathogens, which often cause acute infections and are typically acquired from the environment or other parts of the body. In addition, pathobionts are innocuous to the host under normal conditions,” wrote Dr. Chow of the California Institute of Technology, Pasadena.

In Dr. Volkmann’s study, Bifidobacterium and Lactobacillus, which are usually reduced in proinflammatory disorders, were relatively abundant in patients, compared with controls.

 

She noted specific associations with both symptoms. Parabacteroides and Enterobacteriaceae were associated with increased constipation. Prevotella was associated with increased diarrhea and increased distention/bloating.

Her results are consistent with a Swedish study (Arthritis Res Ther. 2016 Nov 1;18[1]:278) and three Italian studies conducted in Rome, Milan, and Piacenza.

“It’s fascinating that we seem to be identifying a consistent microbiome profile for scleroderma patients,” Dr. Volkmann said.

Dr. Volkmann had no relevant financial disclosures.

[email protected]

SANDESTIN, FLA. – Scleroderma patients appear to have a characteristic microbiome composition, which is consistent in samples taken around the world.

These patients showed decreased populations of beneficial commensal flora and increased populations of proinflammatory species, Elizabeth Volkmann, MD, said at the annual Congress of Clinical Rheumatology.

Furthermore, specific species seem to correlate with specific gastrointestinal symptoms, said Dr. Volkmann of the University of California, Los Angeles. “Features also unexpectedly overlap with the consortium typical for Crohn’s disease, a disease with both inflammatory and fibrosing phenotype,” she said.

Her recent exploration of this topic included 17 patients with scleroderma and GI symptoms and 17 matched healthy controls (BMJ Open Gastro. 2017;3:e000134). Everyone underwent a bowel prep and colonoscopy, during which cecum and sigmoid mucosal lavage samples were obtained. Those samples underwent RNA sequencing.

In addition to quantifying the species present, Dr. Volkmann sought to associate populations with symptoms. The primary assessment tool was the GIT 2.0, which measures distention/bloating; diarrhea; fecal soilage; constipation; emotional well-being; and social functioning.

Similar to the findings in inflammatory disease states, scleroderma patients had decreased levels of commensal Clostridia, a class of Firmicutes that is established in early infancy and very important in the maintenance of gut homeostasis. They also showed a decreased proportion of Faecalibacterium, a genus with anti-inflammatory activity; this finding has been observed in patients with Crohn’s disease.

 

Patients also showed relative increases in pathobionts. These are potentially pathological organisms that, under normal circumstances, live symbiotically. Janet Chow, PhD, who coined the term in a 2011 paper, said these species are typically proinflammatory (Curr Opin Immunol. 2011 Aug; 23[4]:473-80).

“Organisms proposed as pathobionts are associated with chronic inflammatory conditions – unlike opportunistic pathogens, which often cause acute infections and are typically acquired from the environment or other parts of the body. In addition, pathobionts are innocuous to the host under normal conditions,” wrote Dr. Chow of the California Institute of Technology, Pasadena.

In Dr. Volkmann’s study, Bifidobacterium and Lactobacillus, which are usually reduced in proinflammatory disorders, were relatively abundant in patients, compared with controls.

 

She noted specific associations with both symptoms. Parabacteroides and Enterobacteriaceae were associated with increased constipation. Prevotella was associated with increased diarrhea and increased distention/bloating.

Her results are consistent with a Swedish study (Arthritis Res Ther. 2016 Nov 1;18[1]:278) and three Italian studies conducted in Rome, Milan, and Piacenza.

“It’s fascinating that we seem to be identifying a consistent microbiome profile for scleroderma patients,” Dr. Volkmann said.

Dr. Volkmann had no relevant financial disclosures.

[email protected]