Analysis of Zinc and Stromal Immunity in Disuse Osteoporosis: Mendelian Randomization and Transcriptomic Analysis

Area of Science:

• Molecular Biology
• Genetics
• Immunology
• Bone Metabolism

Background:

• Disuse osteoporosis is primarily linked to reduced physical activity.
• The roles of zinc and immunity in the development of disuse osteoporosis are not well understood.
• Investigating the interplay between zinc, immunity, and bone health is crucial for understanding osteoporosis.

Purpose of the Study:

• To investigate the causal relationships between zinc, immunity, and disuse osteoporosis.
• To elucidate the underlying molecular mechanisms, including gene and protein interactions.

Main Methods:

• Integrative approach combining genome-wide association studies (GWAS) and transcriptomics.
• Two-sample Mendelian randomization (MR) analysis using single-nucleotide polymorphisms (SNPs) as instrumental variables.
• Analysis of mRNA expression, transcription factor-mRNA-microRNA (TF-mRNA-miRNA) networks, and molecular docking.

Main Results:

• Demonstrated causal links between zinc and exercise, exercise and immunity, exercise and osteoporosis, and immunity and osteoporosis.
• Identified six key differentially expressed genes (DEGs), including RUNX2 and SLC39A14, as crucial in the TF-mRNA-miRNA network.
• Designed a novel drug candidate (C6O4NH5) targeting SLC39A14, with significant docking energy.

Conclusions:

• Zinc exhibits a protective causal effect against disuse osteoporosis by promoting physical activity and immune function.
• The mRNAs SLC39A14 and RUNX2 are integral components of the zinc-mediated mechanism in disuse osteoporosis.
• Findings suggest potential therapeutic strategies targeting these genes for osteoporosis management.