The Role That Food and Bacteria Play in Generating Abdominal Pain
The Role of Gut Microbiota in Patient Responses to a Dietary Therapy for Abdominal Pain
Visão geral do estudo
Status
Status
Condições
Condições
Intervenção / Tratamento
Intervenção / Tratamento
Tipo de estudo
Tipo de estudo
Inscrição (Estimado)
Inscrição
Estágio
Estágio
- Não aplicável
Contactos e Locais
Locais de estudo
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Ontario
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Kingston, Ontario, Canadá, K7L 5G2
- Recrutamento
- Hotel Dieu Hospital
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Contato:
- Celine Morissette
- Número de telefone: (613) 449-5433
- E-mail: celine.morissette@kingstonhsc.ca
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Critérios de participação
Critérios de elegibilidade
Critérios de elegibilidade
Idades elegíveis para estudo
- Adulto
- Adulto mais velho
Aceita Voluntários Saudáveis
Descrição
Inclusion Criteria:
- Adults aged 18-70 with IBS (Rome IV (now V) criteria)
- PROMIS belly pain score >12
Exclusion Criteria:
- Concurrent significant organic GI pathology (i.e. celiac, IBD, etc.) as some symptoms may be related to their disease and not IBS.
- Concurrent systemic disease and/or laboratory abnormalities considered by investigators to be risky or that could interfere with data collection.
- Major gastrointestinal surgery (e.g. Roux en y, bowel resection) as symptoms may be related to previous surgery rather than IBS.
- Body mass index above 35 kg/m2 as it is unknown how mediators in the GI tract that may be involved in pain signaling in the gut are affected by obesity.
- History of active cancer in the last 5 years, other than basal cell cancer as the treatment may have impacted the GI tract.
- Pregnant or breastfeeding women.
- Active or recent participation (< 1 month) in a clinical study.
- Use of antibiotics, probiotics, during, or one month prior to the study as may affect gut microbiota.
- Use of new medications less than 4 weeks prior to the study as may alter gut microbiota and/or IBS symptoms.
- Allergies to any of the ingredients used in the study.
- Any immune-compromising conditions as may affect GI symptoms.
- Currently being treated for eating disorder, schizophrenia, psychosis or other acute mental disorders as participating in a diet challenge study may have negative impact on these disorders.
Plano de estudo
Como o estudo é projetado?
Detalhes do projeto
- Finalidade Principal: Tratamento
- Alocação: N / D
- Modelo Intervencional: Atribuição de grupo único
- Mascaramento: Nenhum (rótulo aberto)
Número de braços
Armas e Intervenções
Grupo de Participantes / BraçoGrupo de Participantes / Braço |
Intervenção / TratamentoIntervenção / Tratamento |
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Experimental: FODMAP Challenge
Participants will be on a low fodmap diet (LFD) for a total of 6 weeks.
After two weeks on LFD, each participant whose IBS-symptom severity score was reduced by 50 points will be deemed a responder, and will proceed to the next stage of the study.
This will entail each participant remaining on the LFD while beginning 4 four-day individual challenges every 7 days consisting of 3 FODMAP subgroup challenges (galacto-oligosaccahride, fructan, and sorbitol) and 1 glucose challenge as a non-FODMAP carbohydrate control.
Each challenge will comprise of a 4-day challenge with one of the three FODMAP subgroups or a glucose challenge (as a negative control) followed by a 3-day washout period with any residual symptoms resolved while remaining on the LFD prior to the next challenge.
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Prior to beginning the LFD, each participant will provide a stool sample.
This will be used to inoculate a continuous culture system (chemostat) as these vessels maintain fecal microbial communities under controlled anaerobic conditions.
After reaching steady state in culture media with FODMAPs (7 days), the media will be switched to a low FODMAP media for 7 days.
Then each vessel will be exposed to the same FODMAP subgroups challenges and glucose challenge as the participants for 3 days.
At each stage (i.e., steady state, after low fodmap media, after each challenge) culture supernatant will be collected.
This supernatant will be used to test its neurophysiological effects on pain sensing neurons in pre-clinical studies.
In addition, participants will provide a stool sample at each stage.
Fecal supernatants will be produced from these samples and the neurophysiological effects of the fecal supernatants will be tested in pre-clinical studies.
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O que o estudo está medindo?
Medidas de resultados primários
Medidas de resultados primários
Medida de resultado |
Descrição da medida |
Prazo |
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Change in Dorsal Root Ganglion (DRG) neuron rheobase by chemostat supernatant
Prazo: 2-3 week of recording for each supernatant condition.
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DRG neurons will be incubated overnight with chemostat supernatant after steady state, low fodmap media, fodmap subtype media and glucose media.
Patch clamp recordings will be made from neurons the following day the rheobase (minimum current required to elicit an action potential in a neuron) will be measured.
The mean rheobase for neurons exposed to the different supernatant conditions will be compared.
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2-3 week of recording for each supernatant condition.
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Change in Dorsal Root Ganglion (DRG) neuron rheobase by fecal supernatant
Prazo: 2-3 weeks for each supernatant condition
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DRG neurons will be incubated overnight with fecal supernatant at baseline, after low fodmap diet, fodmap subtype challenge and glucose challenge.
Patch clamp recordings will be made from neurons the following day the rheobase (minimum current required to elicit an action potential in a neuron) will be measured.
The mean rheobase for neurons exposed to the different supernatant conditions will be compared.
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2-3 weeks for each supernatant condition
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Medidas de resultados secundários
Medidas de resultados secundários
Medida de resultado |
Descrição da medida |
Prazo |
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Microbial community composition
Prazo: 6 weeks
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The chemostat cultures will be sampled after each stage (steady state, low fodmap media, fodmap subtype medias, glucose media) and analyzed
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6 weeks
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Irritable Bowel Syndrome (IBS) Symptom Severity Score
Prazo: 6 weeks
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IBS Symptom Severity Score (a score of 0 to 500, with higher scores indicating greater symptom severity) will be taken at baseline, after low fodmap diet, each fodmap subtype challenge and glucose challenge.
Change in IBS Symptom Severity Score as well as number of participants with a change of at least 50 points will be analyzed.
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6 weeks
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Patient-Reported Outcomes Measurement Information System Belly Pain Score
Prazo: 6 weeks
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These questionnaires will be administered at baseline, after low fodmap diet, each fodmap subtype challenge and glucose challenge.
The scores at each time point will be compared.
The raw scores are 2-25 and this is converted to a standardized T score.
Higher scores indicate a higher pain score.
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6 weeks
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Colaboradores e Investigadores
Patrocinador
Patrocinador
Colaboradores
Colaboradores
Datas de registro do estudo
Datas Principais do Estudo
Início do estudo (Real)
Início do estudo
Conclusão Primária (Estimado)
Conclusão Primária
Conclusão do estudo (Estimado)
Conclusão do estudo
Datas de inscrição no estudo
Enviado pela primeira vez
Enviado pela primeira vez
Enviado pela primeira vez que atendeu aos critérios de CQ
Enviado pela primeira vez que atendeu aos critérios de CQ
Primeira postagem (Real)
Primeira postagem
Atualizações de registro de estudo
Última Atualização Postada (Real)
Última Atualização Postada
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última verificação
Última verificação
Mais Informações
Termos relacionados a este estudo
Palavras-chave
Termos MeSH relevantes adicionais
Outros números de identificação do estudo
Outros números de identificação do estudo
- 6044324
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