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Therapeutic potential of Lactobacillus casei and Chlorella vulgaris in high-fat diet-induced non-alcoholic fatty liver disease (NAFLD)-associated kidney damages: a stereological study

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Abstract

Background

The non-alcoholic fatty liver disease (NAFLD) is prevalent in as many as 25% of adults who are afflicted with metabolic syndrome. Oxidative stress plays a significant role in the pathophysiology of hepatic and renal injury associated with NAFLD. Therefore, probiotics such as Lactobacillus casei (LBC) and the microalga Chlorella vulgaris (CV) may be beneficial in alleviating kidney injury related to NAFLD.

Materials and methods

This animal study utilized 30 C57BL/6 mice, which were evenly distributed into five groups: the control group, the NAFLD group, the NAFLD + CV group, the NAFLD + LBC group, and the NAFLD + CV + LBC group. A high-fat diet (HFD) was administered to induce NAFLD for six weeks. The treatments with CV and LBC were continued for an additional 35 days. Biochemical parameters, total antioxidant capacity (TAC), and the expression of kidney damage marker genes (KIM 1 and NGAL) in serum and kidney tissue were determined, respectively. A stereological analysis was conducted to observe the structural changes in kidney tissues.

Results

A liver histopathological examination confirmed the successful induction of NAFLD. Biochemical investigations revealed that the NAFLD group exhibited increased ALT and AST levels, significantly reduced in the therapy groups (p < 0.001). The gene expression levels of KIM-1 and NGAL were elevated in NAFLD but were significantly reduced by CV and LBC therapies (p < 0.001). Stereological examinations revealed reduced kidney size, volume, and tissue composition in the NAFLD group, with significant improvements observed in the treated groups (p < 0.001).

Conclusion

This study highlights the potential therapeutic efficacy of C. vulgaris and L. casei in mitigating kidney damage caused by NAFLD. These findings provide valuable insights for developing novel treatment approaches for managing NAFLD and its associated complications.

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Data availability

This article contains all data created and examined throughout this investigation. The corresponding author will provide datasets used or analyzed during the current work upon reasonable request.

Abbreviations

ALT:

Alanine Aminotransferase

AST:

Aspartate Aminotransferase

BUN:

Blood Urea Nitrogen

Chol:

Cholesterol

CKD:

Chronic Kidney Disease

CV:

Chlorella vulgaris

CVD:

Cardio vascular Diseases

DCT:

Distal convoluted tubule

FOXO1:

Forkhead box protein O1

FRAP:

Ferric reducing Antioxidant Power

GAPDH:

Glyceraldehyde 3-phosphate dehydrogenase

H&E:

Hematoxylin and Eosin

HFD:

High-fat diet

KIM-1:

Kidney Injury Molecule-1

LBC:

Lactobacillus casei

MAFLD:

Metabolic-Associated Fatty Liver disease

NAFLD:

Non-alcoholic fatty liver disease

NASH:

Non-alcoholic steatohepatitis

NGAL:

Neutrophil gelatinase-associated lipocalin

OS:

Oxidative stress

p-AMPK:

Phosphorylated AMP-activated protein kinase

PCT:

Proximal convoluted tubule

ROS:

Reactive Oxygen Species

RT-PCR:

Real-Time Polymerase Chain Reaction

T2D:

Type 2 diabetes

TAC:

Total Antioxidant Capacity

TG:

Triglyceride

TPTZ:

2,4,6 tripyridyl-s-triazine

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Acknowledgements

The present article was extracted from the thesis written by Haniyeh Keyghobadi has been submitted in Department of Biology, Zarghan Branch, Islamic Azad University, Zarghan, Iran.

Funding

Public, private nor nonprofit funding organizations did not provide any specific grants for this research.

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Contributions

All experiments, statistical analysis, and figure preparation were conducted by H.K (Haniyeh Keyghobadi), H.B (Hadis bozorgpoursavadjani), N.M (Nazanin Mohammadipoor) and F.K (Farhad Koohpeyma). The initial draft of manuscript was written by M.N (Marzieh Nemati), F.D (Farshad Dehghani), and GH.K (Gholamhossein Keighobadi). All tests were set up and second draft of manuscript was written by F.k, and SD (Sanaz Dastghaib). A final manuscript proof was completed by SD who also contributed more funds to the project.

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Correspondence to Sanaz Dastghaib.

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Keyghobadi, H., bozorgpoursavadjani, H., Koohpeyma, F. et al. Therapeutic potential of Lactobacillus casei and Chlorella vulgaris in high-fat diet-induced non-alcoholic fatty liver disease (NAFLD)-associated kidney damages: a stereological study. Mol Biol Rep 51, 613 (2024). https://doi.org/10.1007/s11033-024-09542-1

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