Exposure to cobalt causes transcriptomic and proteomic changes in two rat liver derived cell lines

Area of Science:

• Toxicology
• Molecular Biology
• Biochemistry

Background:

• Cobalt is a transition metal with known toxicity at higher doses.
• Mechanisms underlying cobalt toxicity are not fully understood.
• Occupational exposure to cobalt is a concern in various industries.

Purpose of the Study:

• To elucidate cobalt toxicity mechanisms using in vitro models.
• To identify potential biomarkers of cobalt exposure and effect.
• To investigate cellular responses to cobalt chloride exposure.

Main Methods:

• Exposure of rat liver cell lines (H4-II-E-C3, MH1C1) to cobalt chloride.
• Gene expression analysis using DNA microarrays.
• Cytoplasmic protein abundance analysis using mass spectrometry.
• Bioinformatic analysis of enriched pathways and functions.

Main Results:

• Cobalt exposure induced a hypoxic-like response, affecting Hif-1α signaling and energy metabolism.
• Oxidative stress pathways, including NRF2-mediated response and glutathione production, were modulated.
• Differentially expressed genes and proteins were identified in both cell lines.
• Enriched biological functions and pathways related to cellular stress were observed.

Conclusions:

• Cobalt toxicity involves the induction of hypoxic-like responses and oxidative stress.
• Identified genes and proteins provide insights into cobalt's molecular mechanisms.
• Potential biomarkers for cobalt exposure and effect were discovered in vitro.
• Findings support further in vivo studies for targeted investigations.