Oxidative Stress Correlates with More Aggressive Features in Thyroid Cancer

Area of Science:

• Endocrinology
• Oncology
• Molecular Biology

Background:

• Oxidative stress (OS) plays a role in thyroid cancer pathogenesis and progression.
• Reactive oxygen species (ROS) are implicated in cellular damage and disease development.

Purpose of the Study:

• To investigate OS levels in thyroid lesions and correlate them with clinicopathological features.
• To evaluate NOX4 expression, GPx activity, and genetic patterns in relation to OS.
• To understand the impact of OS on thyroid differentiation and tumor aggressiveness.

Main Methods:

• Measurement of ROS, NOX4 protein expression, and GPx activity in 50 malignant/benign thyroid lesions and 41 normal tissues.
• Correlation analysis with thyroid differentiation score (TDS), tumor stage, ATA risk, and genetic mutations (MEK-ERK pathway).

Main Results:

• Malignant and benign thyroid lesions showed higher ROS generation and NOX4 expression than normal tissues.
• Follicular and anaplastic cancers exhibited increased OS compared to papillary tumors.
• Increased OS was observed in mutated papillary thyroid cancers and inversely correlated with TDS.
• GPx activity was elevated in tumors and inversely correlated with OS.

Conclusions:

• Thyroid tumors experience heightened OS with compensatory GPx activity.
• OS is linked to tumor aggressiveness, specific mutations, and reduced thyroid differentiation.
• ROS may inhibit genes crucial for thyroid differentiation.