Understanding how gut bacteria affect response to methotrexate in rheumatoid arthritis

Identifying and targeting gut microbial mechanisms that contribute to methotrexate response in rheumatoid arthritis

NIH-funded research Veterans Affairs Med Ctr San Francisco · NIH-10975911

This study is looking at how the bacteria in your gut might affect how well low-dose methotrexate works for people with rheumatoid arthritis, with the hope of finding ways to improve treatment by changing those gut bacteria.

Quick facts

Grant typeNIH-funded research
Study typeNIH-funded research
Funding institutionVeterans Affairs Med Ctr San Francisco NIH-funded
Lab location1 site (San Francisco, United States)
Project IDNIH-10975911 on NIH RePORTER

What this research studies

This research investigates the role of gut microbiota in influencing how patients with rheumatoid arthritis respond to low-dose methotrexate, a common treatment. By analyzing the gut bacteria of patients, the study aims to identify specific microbial genes that may enhance or hinder the effectiveness of methotrexate. The researchers will explore how methotrexate interacts with these gut microbes and how this interaction affects the immune system. Ultimately, the goal is to find ways to modify gut bacteria to improve treatment outcomes for patients.

Who could benefit from this research

Good fit: Ideal candidates for this research are patients with rheumatoid arthritis who are currently being treated with methotrexate but are not experiencing adequate relief from their symptoms.

Not a fit: Patients who do not have rheumatoid arthritis or those who are not being treated with methotrexate are unlikely to benefit from this research.

Why it matters

Potential benefit: If successful, this research could lead to improved treatment strategies for rheumatoid arthritis patients, allowing more individuals to benefit from methotrexate therapy.

How similar studies have performed: Previous research has indicated that gut microbiota can influence drug responses, suggesting that this approach may yield valuable insights, although the specific focus on methotrexate in rheumatoid arthritis is relatively novel.

Where this research is happening

San Francisco, United States

Researchers

About this research

  1. This is an active NIH-funded research project — typically early-stage science, not a clinical trial accepting patient enrollment.
  2. Some NIH-funded labs run parallel clinical studies or seek volunteers for related work. To check, contact the principal investigator or institution listed above.
  3. For full project details, budget, and progress reports, visit the official NIH RePORTER page below.
Conditions Autoimmune Diseasesautoimmune disorder
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.