The Influence of Probiotic Supplementation on the Severity of Anxiety and Depressive Symptoms, as Well as the Function and Composition of Gut Microbiota, Metabolic, Inflammation, and Oxidative Stress Markers in Patients With Depression

Summary

The aim of this study is to gather empirical evidence which will enable to evaluate the impact of probiotic supplementation on the severity of anxiety and depressive symptoms, function, and composition of gut microbiota, metabolic parameters, inflammation, and oxidative stress markers in patients with diagnosed depressive disorders.

The designed study will be prospective, randomized, placebo-controlled, and double-blind. The intervention period will last 8 weeks for each patient. The study will be conducted on 100 patients in total, who will be randomly divided into two groups, consisting of 50 patients each.

Patients included in Group I (PRO-D) will receive one capsule daily containing a probiotic mixture at a daily dose of 3×109 colony-forming units (CFU). The probiotic will be composed of two bacteria strains: Lactobacillus helveticus Rosell®-52, Bifidobacterium longum Rosell®-175, and excipients: potato starch, magnesium stearate, and the capsule shell, made of hydroxypropylmethylcellulose.

Patients included in Group II (PLC-D) will receive daily the same capsule, containing only excipients: potato starch, maltodextrin, and the capsule shell. The color, smell, and taste of the placebo will not be different from those included in the probiotic capsule.

Patients will be considered compliant if they consume \>= 80% of the supplements.

The primary outcome measures will be the severity of depressive anxiety and stress symptoms assessed with Montgomery-Åsberg Depression Rating Scale (MADRS) and the Depression, Anxiety, Stress Scale (DASS) with subscales scores, the quality of life level assessed with the WHOQOL-BREF instrument. The secondary outcomes measures will include: blood pressure (BP), body mass index (BMI) and waist circumference (WC) measures, fasting glucose (fGlc), HDL cholesterol (HDL-C), triglycerides (TG), white blood cells count (WBC), neutrofiles, serum levels of C-reactive protein (CRP), the level of faecal SCFAs, faecal microbiota α-diversity and the level of oxidative stress parameters (total antioxidant capacity (TAC) and malondialdehyde (MDA)) in the blood serum.

Conditions

• Depression
• Anxiety

Interventions

DIETARY_SUPPLEMENT

Probiotic composed of two bacteria strains: Lactobacillus helveticus Rosell and Bifidobacterium longum Rosell.

We plan to investigate the impact of the Lactobacillus helveticus Rosell and Bifidobacterium longum Rosell on clinical and biochemical parameters in the experimental group.

OTHER

control group

We plan to investigate the impact of a placebo on clinical and biochemical parameters in the control group.

Sponsors & Collaborators

• Medical University of Lodz

  lead OTHER

Principal Investigators

• Dominik Strzelecki, MD, PhD · Medical University of Lodz

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

QUADRUPLE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

70 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2021-01-04

Primary Completion

2023-05-31

Completion

2023-12-31

Countries

• Poland

Study Locations