What consequence does high H2O2 levels likely have on cellular integrity?

• A. Induces oxidative stress
• B. Improves cellular repair
• C. Reduces apoptosis
• D. Enhances mitochondrial function

Answer: (A)

High levels of hydrogen peroxide (H2O2) induce oxidative stress, which is a significant consequence for cellular integrity. Oxidative stress occurs when there is an imbalance between the production of reactive oxygen species (ROS) like H2O2 and the cell's ability to detoxify these reactive products or repair the resulting damage.

When H2O2 accumulates, it can lead to various forms of cellular damage, including lipid peroxidation, protein oxidation, and DNA damage. This oxidative damage can disrupt normal cellular function, lead to inflammation, and ultimately contribute to cell death if not adequately managed.

Cells typically utilize antioxidant mechanisms, such as catalase and peroxidases, to decompose H2O2 into less harmful molecules. However, excessive amounts can overwhelm these protective systems, exacerbating the stress and potentially leading to conditions like neurodegenerative diseases, cancer, and other age-related disorders. Thus, the question correctly identifies that high H2O2 levels relate to inducing oxidative stress, which adversely impacts cellular integrity.