Gut Microbiome Engineering for Diabetic Kidney Disease Prevention: A Lactobacillus rhamnosus GG Intervention Study.

2025-06-19
Biology 14(6)
- Alaa Talal Qumsani

PubMed: 40563973
DOI: 10.3390/biology14060723

Study Design

Type: Observational
Population: Six experimental cohorts: control, probiotic-supplemented control, diabetic, diabetic receiving probiotic therapy, diabetic with antibiotics, and diabetic treated with both antibiotics and probiotics.
Methods: Diabetic conditions were established via intraperitoneal administration of streptozotocin (50 mg/kg) following overnight fasting; probiotic therapy (3 × 10^9 CFU/kg, bi-daily) began one month before diabetes induction and continued throughout the study duration; glycemic indices, inflammatory biomarkers, renal function indices, urinary albumin excretion, HOMA-IR, metabolic syndrome scores, and microbiome characterization by 16S rRNA gene sequencing and metagenomic shotgun sequencing were assessed.

The gut microbiota has emerged as a critical modulator in metabolic diseases, with substantial evidence supporting its role in attenuating diabetes-related nephropathy. Recent investigations demonstrate that strategic manipulation of intestinal microflora offers novel therapeutic avenues for safeguarding renal function against diabetic complications. This investigation sought to determine the nephroprotective potential of Lactobacillus rhamnosus GG (LGG) administration in diabetic nephropathy models. Six experimental cohorts were evaluated: control, probiotic-supplemented control, diabetic, diabetic receiving probiotic therapy, diabetic with antibiotics, and diabetic treated with both antibiotics and probiotics. Diabetic conditions were established via intraperitoneal administration of streptozotocin (50 mg/kg) following overnight fasting, according to validated protocols for experimental diabetes induction. Probiotic therapy (3 × 10⁹ CFU/kg, bi-daily) began one month before diabetes induction and continued throughout the study duration. Glycemic indices were monitored at bi-weekly intervals, inflammatory biomarkers, renal function indices, and urinary albumin excretion. The metabolic profile was evaluated through the determination of HOMA-IR and the computation of metabolic syndrome scores. Microbiome characterization employed 16S rRNA gene sequencing alongside metagenomic shotgun sequencing for comprehensive microbial community mapping. L. rhamnosus GG supplementation substantially augmented microbiome richness and evenness metrics. Principal component analysis revealed distinct clustering of microbial populations between treatment groups. The Prevotella/Bacteroides ratio, an emerging marker of metabolic dysfunction, normalized following probiotic intervention in diabetic subjects. Results: L. rhamnosus GG administration markedly attenuated diabetic progression, achieving glycated hemoglobin reduction of 32% compared to untreated controls. Pro-inflammatory cytokine levels (IL-6, TNF-α) decreased significantly, while anti-inflammatory mediators (IL-10, TGF-β) exhibited enhanced expression. The renal morphometric analysis demonstrated preservation of glomerular architecture and reduced interstitial fibrosis. Additionally, transmission electron microscopy confirmed the maintenance of podocyte foot process integrity in probiotic-treated groups. Conclusions: The administration of Lactobacillus rhamnosus GG demonstrated profound renoprotective efficacy through multifaceted mechanisms, including microbiome reconstitution, metabolic amelioration, and inflammation modulation. Therapeutic effects suggest the potential of a combined probiotic and pharmacological approach to attenuate diabetic-induced renal pathology with enhanced efficacy.

Research Insights

Supplement	Dose	Health Outcome	Effect Type	Effect Size	Source
Lactobacillus rhamnosus GG	—	Improved Glycemia	Beneficial	Moderate	View source L. rhamnosus GG administration markedly attenuated diabetic progression, achieving glycated hemoglobin reduction of 32% compared to untreated controls.
Lactobacillus rhamnosus GG	—	Improved Gut Microbiome Composition	Beneficial	Moderate	View source L. rhamnosus GG supplementation substantially augmented microbiome richness and evenness metrics... The Prevotella/Bacteroides ratio, an emerging marker of metabolic dysfunction, normalized following probiotic intervention in diabetic subjects.
Lactobacillus rhamnosus GG	—	Improved Kidney Function	Beneficial	Large	View source L. rhamnosus GG administration markedly attenuated diabetic progression, achieving glycated hemoglobin reduction of 32% compared to untreated controls... The renal morphometric analysis demonstrated preservation of glomerular architecture and reduced interstitial fibrosis.
Lactobacillus rhamnosus GG	—	Reduced Inflammation	Beneficial	Moderate	View source Pro-inflammatory cytokine levels (IL-6, TNF-α) decreased significantly, while anti-inflammatory mediators (IL-10, TGF-β) exhibited enhanced expression.