Optimizing Anti-IL17 Antibody Therapy by Associating Fiber Supplementation to Correct Treatment-aggravated Gut Dysbiosis in Axial Spondyloarthritis - RESPOND-IL17 (RESPOND-IL17)

Optimizing Anti-IL17 Antibody Therapy by Associating Fiber Supplementation to Correct Treatment-aggravated Gut Dysbiosis in Axial Spondyloarthritis - RESPOND-IL17

Optimization of Anti-IL17 Antibody Therapy by Associating Fiber Supplementation to Correct Treatment-aggravated Gut Dysbiosis in Axial Spondyloarthritis - RESPOND-IL17

Fiber is the main source of energy for colonic bacteria and its consumption favorably modifies the composition of the microbiota in only a few days. Their fermentation in the colon releases short-chain fatty acids (SCFAs). Clostridiales contain many strains producing SCFAs. These SCFAs can restore the intestinal barrier and promote certain anti-inflammatory cells, including regulatory T cells (Tregs), which are essential to the mechanisms in tolerance of the self. Fibers could therefore correct the intestinal abnormalities present in patients with axial spondyloarthritis (AxSpA) and aggravated by anti-IL-17 drugs and thus improve the therapeutic response to these treatments. The hypothesis is that dietary fiber will correct the dysbiosis in AxSpA patients and increase the release of SCFAs, which favorably modulate the immune response and improve AxSpA.

Axial spondyloarthritis (AxSpA) is the second most common chronic inflammatory rheumatic disease, which develops preferentially in young subjects and results in a significant impairment of quality of life, particularly due to painful symptoms. The importance of the digestive system has long been recognized, since this disease is considered to be part of a larger group of diseases including Crohn's disease and ulcerative colitis because of their frequent association in the same patient, and because leaky gut disorders and alterations of the intestinal microbiota (dysbiosis) have been described in these patients. These abnormalities may stimulate the immune system and therefore be involved in inflammatory processes (especially Th17). The available treatments are based on non-steroidal anti-inflammatory drugs, and in the event of failure or intolerance, biomedicines targeting TNF can be used. Therapeutic monoclonal antibodies against IL-17 have recently enriched the therapeutic arsenal. Although most anti-TNF agents have a beneficial effect on the rheumatologic and digestive aspects of these diseases, anti-IL-17 agents are not expected to be effective in inflammatory bowel diseases. Indeed, a deleterious role of anti-IL-17 on the intestinal microbiota has even been demonstrated, which could result in a reduction of the systemic anti-inflammatory effect expected from these molecules, and consequently of the clinical benefit felt by the patient. In fact, anti-IL-17s lead to a significant decrease in Clostridiales, bacteria that participate in intestinal homeostasis. Fiber is the main source of energy for colonic bacteria and its consumption favorably modifies the composition of the microbiota in just a few days. Their fermentation in the colon releases short-chain fatty acids (SCFAs). Clostridiales contain many strains producing SCFAs. These SCFAs can restore the intestinal barrier and promote certain anti-inflammatory cells, including regulatory T cells (Tregs), which are essential to the mechanisms in tolerance of the self. Fibers could therefore correct the intestinal abnormalities present in AxSpA patients and aggravated by anti-IL-17 drugs and thus improve the therapeutic response to these treatments. The hypothesis is therefore that dietary fiber will correct the dysbiosis in AxSpA patients and increase the release of SCFAs, which favorably modulate the immune response and thus improve AxSpA.

All treatments will be numbered. The treatment number will be assigned according to the randomization list. All participants (patient/evaluator/etc.) will be blinded to the treatment administered. Only the hospital pharmacy will know the assigned treatment and will guarantee the blinding.

Patients with aSp receiving fiber supplements in the form of Fibruline® Instant (Fagron laboratories)

Patients with aSp receiving fake fiber supplements (placebo) in the form of Maltodextrine (laboratoire Fagron).

Patients will receive fiber supplementation with inulin (Fibruline® Instant, Fagron laboratory) at a rate of 12 grams of powder per day reconstituted with approximately 60mL of water and consumed in one intake per day. To confirm the efficacy of treatment, the percentage of patients with a >10% decrease in Clostriadiales in their stools at 3 months after initiation of anti-IL-17 will be recorded. This percentage will be based on the distribution of bacteria analyzed by 16S RNA sequencing.

Patients will receive a placebo consisting of Maltodextrin (Fagron laboratories), packaged in jars identical to those used for inulin, with a volumetric equivalent, an energy contribution and very similar color. Patients will consume 12 grams of powder per day reconstituted with approximately 60mL of water and consumed in one intake per day. The percentage of patients with a >10% decrease in Clostriadiales in their stools at 3 months after initiation of anti-IL-17 will be recorded. This percentage will be based on the distribution of bacteria analyzed by 16S RNA sequencing.

Patients will receive fiber supplementation with inulin (Fibruline® Instant, Fagron laboratory) at a rate of 12 grams of powder per day reconstituted with approximately 60mL of water and consumed in one intake per day. To confirm the efficacy of treatment, the percentage of patients with a >10% decrease in Clostriadiales in their stools at 3 months after initiation of anti-IL-17 will be recorded. This percentage will be based on the distribution of bacteria analyzed by 16S RNA sequencing.

Patients will receive a placebo consisting of Maltodextrin (Fagron laboratories), packaged in jars identical to those used for inulin, with a volumetric equivalent, an energy contribution and very similar color. Patients will consume 12 grams of powder per day reconstituted with approximately 60mL of water and consumed in one intake per day. The percentage of patients with a >10% decrease in Clostriadiales in their stools at 3 months after initiation of anti-IL-17 will be recorded. This percentage will be based on the distribution of bacteria analyzed by 16S RNA sequencing.

Effect of fiber supplementation on clinical therapeutic response in the experimental group: Delta BASDAI

Clinical response rates observed in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. The BASDAI (Bath Ankylosing Spondylitis Disease Activity Index) will be used to measure the percentage of patients responding positively to treatment.

Effect of fiber supplementation on clinical therapeutic response in the experimental group: Delta BASDAI

Clinical response rates observed at 3 months in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. The BASDAI (Bath Ankylosing Spondylitis Disease Activity Index) will be used to measure the percentage of patients responding positively to treatment.

Clinical response rates observed in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. The ASAS20 will be used to measure the percentage of patients responding positively to treatment. This tool was developed by the Assessment of SpondylArthritis international Society (ASAS). The ASAS Response Criteria (ASAS 20) is defined as an improvement in at least 20% and an absolute improvement in at least 10 units on a 0-100 scale in at least three of the following domains: Patient global assessment, Pain assessment, Function, and Inflammation (last 2 questions of BASDAI).

Clinical response rates observed at 3 months in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. The ASAS20 will be used to measure the percentage of patients responding positively to treatment. This tool was developed by the Assessment of SpondylArthritis international Society (ASAS). The ASAS Response Criteria (ASAS 20) is defined as an improvement in at least 20% and an absolute improvement in at least 10 units on a 0-100 scale in at least three of the following domains: Patient global assessment, Pain assessment, Function, and Inflammation (last 2 questions of BASDAI).

Clinical response rates observed in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. The ASAS40 will be used to measure the percentage of patients responding positively to treatment. This tool was developed by the Assessment of SpondylArthritis international Society (ASAS). The ASAS Response Criteria (ASAS 40) is defined as an improvement in at least 40% and an absolute improvement in at least 10 units on a 0-100 scale in at least three of the following domains: Patient global assessment, Pain assessment, Function, and Inflammation (last 2 questions of BASDAI).

Clinical response rates observed at 3 months in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. The ASAS40 will be used to measure the percentage of patients responding positively to treatment. This tool was developed by the Assessment of SpondylArthritis international Society (ASAS). The ASAS Response Criteria (ASAS 40) is defined as an improvement in at least 40% and an absolute improvement in at least 10 units on a 0-100 scale in at least three of the following domains: Patient global assessment, Pain assessment, Function, and Inflammation (last 2 questions of BASDAI).

Clinical response rates observed at 3 months in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. The ASDAS (Ankylosing Spondylitis Disease Activity Score) will be used to measure the percentage of patients responding positively to treatment. This tool is an index to assess disease activity in Ankylosing Spondylitis. The preferred score uses CRP (C-reactive protein) rather than ESR (erythrocyte sedimentation rate).

Clinical response rates observed at 3 months in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. The ASDAS (Ankylosing Spondylitis Disease Activity Score) will be used to measure the percentage of patients responding positively to treatment. This tool is an index to assess disease activity in Ankylosing Spondylitis. The preferred score uses CRP (C-reactive protein) rather than ESR (erythrocyte sedimentation rate).

Clinical response rates in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. Digestive symptoms will be assessed using the Gastrointestinal Quality of Life Index (GIQLI) questionnaire at Week 0 and Week 12. The GIQLI is a measure of the subjective perception of well-being by a patient, which may vary unexpectedly between diagnostic groups. The GIQLI was initiated in Germany and includes 36 items asking about symptoms, physical status, emotions, social dysfunction, and effects of medical treatment. The Questions cover the following 5 dimensions : symptoms, physical condition, emotions, social integration and medical treatment.

Clinical response rates observed at 3 months in patients treated with anti-IL-17 with fiber supplementation will be recorded as a percentage. Digestive symptoms will be assessed using the Gastrointestinal Quality of Life Index (GIQLI) questionnaire at Week 0 and Week 12. The GIQLI is a measure of the subjective perception of well-being by a patient, which may vary unexpectedly between diagnostic groups. The GIQLI was initiated in Germany and includes 36 items asking about symptoms, physical status, emotions, social dysfunction, and effects of medical treatment. The Questions cover the following 5 dimensions : symptoms, physical condition, emotions, social integration and medical treatment.

Clinical response rates observed in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. The BASDAI (Bath Ankylosing Spondylitis Disease Activity Index) will be used to measure the percentage of patients responding positively to treatment.

Clinical response rates observed at 3 months in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. The BASDAI (Bath Ankylosing Spondylitis Disease Activity Index) will be used to measure the percentage of patients responding positively to treatment.

Clinical response rates observed in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. The ASAS20 will be used to measure the percentage of patients responding positively to treatment.This tool was developed by the Assessment of SpondylArthritis international Society (ASAS). The ASAS Response Criteria (ASAS 20) is defined as an improvement in at least 20% and an absolute improvement in at least 10 units on a 0-100 scale in at least three of the following domains: Patient global assessment, Pain assessment, Function, and Inflammation (last 2 questions of BASDAI).

Clinical response rates observed at 3 months in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. The ASAS20 will be used to measure the percentage of patients responding positively to treatment.This tool was developed by the Assessment of SpondylArthritis international Society (ASAS). The ASAS Response Criteria (ASAS 20) is defined as an improvement in at least 20% and an absolute improvement in at least 10 units on a 0-100 scale in at least three of the following domains: Patient global assessment, Pain assessment, Function, and Inflammation (last 2 questions of BASDAI).

Clinical response rates observed in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. The ASAS40 will be used to measure the percentage of patients responding positively to treatment.This tool was developed by the Assessment of SpondylArthritis international Society (ASAS). The ASAS Response Criteria (ASAS 40) is defined as an improvement in at least 40% and an absolute improvement in at least 10 units on a 0-100 scale in at least three of the following domains: Patient global assessment, Pain assessment, Function, and Inflammation (last 2 questions of BASDAI).

Clinical response rates observed at 3 months in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. The ASAS40 will be used to measure the percentage of patients responding positively to treatment.This tool was developed by the Assessment of SpondylArthritis international Society (ASAS). The ASAS Response Criteria (ASAS 40) is defined as an improvement in at least 40% and an absolute improvement in at least 10 units on a 0-100 scale in at least three of the following domains: Patient global assessment, Pain assessment, Function, and Inflammation (last 2 questions of BASDAI).

Clinical response rates observed at 3 months in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. The ASDAS (Ankylosing Spondylitis Disease Activity Score) will be used to measure the percentage of patients responding positively to treatment. This tool is an index to assess disease activity in Ankylosing Spondylitis. The preferred score uses CRP (C-reactive protein) rather than ESR (erythrocyte sedimentation rate).

Clinical response rates observed at 3 months in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. The ASDAS (Ankylosing Spondylitis Disease Activity Score) will be used to measure the percentage of patients responding positively to treatment. This tool is an index to assess disease activity in Ankylosing Spondylitis. The preferred score uses CRP (C-reactive protein) rather than ESR (erythrocyte sedimentation rate).

Clinical response rates observed in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. Digestive symptoms will be assessed using the Gastrointestinal Quality of Life Index (GIQLI) questionnaire at Week 0 and Week 12. The GIQLI is a measure of the subjective perception of well-being by a patient, which may vary unexpectedly between diagnostic groups. The GIQLI was initiated in Germany and includes 36 items asking about symptoms, physical status, emotions, social dysfunction, and effects of medical treatment. The Questions cover the following 5 dimensions : symptoms, physical condition, emotions, social integration and medical treatment.

Clinical response rates observed at 3 months in patients treated with anti-IL-17 without fiber supplementation will be recorded as a percentage. Digestive symptoms will be assessed using the Gastrointestinal Quality of Life Index (GIQLI) questionnaire at Week 0 and Week 12. The GIQLI is a measure of the subjective perception of well-being by a patient, which may vary unexpectedly between diagnostic groups. The GIQLI was initiated in Germany and includes 36 items asking about symptoms, physical status, emotions, social dysfunction, and effects of medical treatment. The Questions cover the following 5 dimensions : symptoms, physical condition, emotions, social integration and medical treatment.

Changes in serum concentrations of intestinal permeability markers (zonulin, claudin-3, iFABP); and endotoxemia (LBP, CD14s) will be measured by ELISA in ng/ml

Changes in serum concentrations of intestinal permeability markers (zonulin, claudin-3, iFABP); and endotoxemia (LBP, CD14s) will be measured by ELISA in ng/ml

The distribution and diversity of different germs will be measured by 16S RNA sequencing. Quantitative

The distribution and diversity of different germs will be measured by 16S RNA sequencing. Quantitative

All adverse events related or not to anti-IL17 treatment and potentially associated with the consumption of high doses of fiber (bloating, flatulence, diarrhea, abdominal pain) will be recorded

All adverse events related or not to anti-IL17 treatment and potentially associated with the consumption of high doses of fiber (bloating, flatulence, diarrhea, abdominal pain) will be recorded

Monocytes will be measured by flow cytometry (CD25, CD127, CXCR3, CCR6, CD294, CD14, CD16, TNF, IL-6) as % of total white blood cells

Monocytes will be measured by flow cytometry (CD25, CD127, CXCR3, CCR6, CD294, CD14, CD16, TNF, IL-6) as % of total white blood cells

Monocytes will be measured by flow cytometry (CD25, CD127, CXCR3, CCR6, CD294, CD14, CD16, TNF, IL-6) as % of total white blood cells

Monocytes will be measured by flow cytometry (CD25, CD127, CXCR3, CCR6, CD294, CD14, CD16, TNF, IL-6) as % of total white blood cells

Inclusion criteria: Patients with spondyloarthritis meeting the ASAS criteria Patient considered by the treating rheumatologist for anti-IL-17 biomedication Patients aged between 18 and 90 years of age Patients who are affiliated to a French social security system or beneficiaries of such a system Patients with no desire to become pregnant during the study period (Effective contraception for women of childbearing age during the study period (surgical sterilization, hormonal contraceptives, barrier method, intrauterine device)) Exclusion Criteria: Lack of written informed consent after a time of reflection Patients participating in other therapeutic research or having participated in research for which the exclusion period has not ended Patient under court protection, guardianship or curatorship. Patient unable to give consent. Pregnant or breastfeeding woman Patients with digestive disorders for which a chronic inflammatory bowel disease has not been excluded Patients with fructose intolerance or glucose or galactose malabsorption Patients with known intolerance to inulin or maltodextrin