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A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders
Published on: June 8, 2014
ABCA8 drives bone loss via disrupting Th17/Treg imbalance: a novel immunometabolic target for osteoporosis
Wenjing Yi1,2, Wenan Xu1,3, Tao Yang1,4
1Shenzhen Clinical College of Stomatology, School of Stomatology, Southern Medical University, Shenzhen, 518000, Guangdong, China.
Background:
Osteoporosis is a metabolic bone disease characterized by reduced bone mass and microarchitectural deterioration, with complex involvement of molecular networks and immune-associated transcriptional dysregulation.
Objective:
This study aimed to elucidate the immune-associated regulatory features of ATP-binding cassette subfamily A member 8 (ABCA8) in osteoporosis.
Methods:
Differential gene expression analysis was performed using the GSE35958 dataset, and 384 up-regulated genes and 1143 down-regulated genes were identified. Weighted gene co-expression network analysis (WGCNA) and machine learning-based feature selection (LASSO, random forest, and Boruta) were applied to identify key osteoporosis-associated genes. Gene set enrichment analysis (GSEA) and single-sample gene set enrichment analysis (ssGSEA) were conducted to explore immune-associated transcriptional signatures, including Th17- and regulatory T cell (Treg)-related signatures. In vivo validation was conducted in ovariectomized (OVX) rats, with gene modulation experiments evaluating bone phenotypes, osteogenic and osteoclastic markers, and inflammatory cytokine profiles.
Results:
ABCA8 was significantly upregulated in osteoporotic samples and associated with osteoporosis-related transcriptional features. High ABCA8 expression was associated with altered immune-associated signatures, including Th17- and regulatory T cell (Treg)-related transcriptional features, as revealed by ssGSEA. Pathway analyses further linked ABCA8 expression to immune regulation and inflammatory signaling pathways. In OVX rats, ABCA8 knockdown improved trabecular bone microarchitecture, upregulated osteogenic markers (Runt-related transcription factor 2 (RUNX2), osteocalcin (OCN), and osteoprotegerin (OPG)), and downregulated bone resorption markers (receptor activator of nuclear factor κB ligand (RANKL) and tartrate-resistant acid phosphatase (TRAP)). Conversely, ABCA8 overexpression aggravated bone loss and was accompanied by disruption of the Th17/Treg balance and increased levels of interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and interleukin-17 (IL-17).
Conclusion:
ABCA8 is closely associated with osteoporosis-related immune-associated transcriptional alterations and contributes to disease progression through dysregulation of osteoimmune balance. These findings suggest that ABCA8 may represent a potential immunoregulatory target for therapeutic intervention in osteoporosis.
Insights
ATP-binding cassette subfamily A member 8 (ABCA8) is linked to osteoporosis progression by disrupting immune balance. Targeting ABCA8 may offer new therapeutic strategies for osteoporosis treatment.
Area of Science:
- Bone Biology and Immunology
- Molecular Genetics
- Disease Pathogenesis
Background:
- Osteoporosis is a metabolic bone disease marked by decreased bone mass and deteriorating bone structure.
- Complex molecular networks and immune dysregulation are involved in osteoporosis pathogenesis.
Purpose of the Study:
- To investigate the immune-associated regulatory role of ATP-binding cassette subfamily A member 8 (ABCA8) in osteoporosis.
- To elucidate the connection between ABCA8 expression and immune cell signatures in osteoporosis.
Main Methods:
- Differential gene expression analysis and weighted gene co-expression network analysis (WGCNA) identified key osteoporosis genes.
- Machine learning algorithms (LASSO, random forest, Boruta) selected significant osteoporosis-associated genes.
- Gene set enrichment analysis (GSEA) and ssGSEA explored immune signatures, including Th17 and regulatory T cell (Treg) pathways. In vivo studies used ovariectomized (OVX) rats to validate findings.
Main Results:
- ABCA8 was upregulated in osteoporotic samples and correlated with immune-associated transcriptional features, including Th17/Treg signatures.
- ABCA8 knockdown in OVX rats improved bone microarchitecture and modulated osteogenic/osteoclastic markers.
- ABCA8 overexpression exacerbated bone loss, disrupted Th17/Treg balance, and increased pro-inflammatory cytokines (IL-6, TNF-α, IL-17).
Conclusions:
- ABCA8 is implicated in osteoporosis progression via dysregulation of the osteoimmune balance.
- ABCA8 influences immune cell signatures and inflammatory responses in osteoporosis.
- ABCA8 presents a potential immunoregulatory target for osteoporosis therapeutics.
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