The rate of oxygen utilization by cells

Area of Science:

• * Biochemistry and Evolutionary Biology
• * Cellular Respiration and Redox Biology

Background:

• * The discovery of oxygen is a pivotal scientific achievement impacting astrophysics and evolutionary biology.
• * Multicellular organisms evolved mechanisms to capture and deliver dioxygen for cellular energy production.
• * Oxygen is essential for extracting energy from food, with humans requiring approximately 22 moles daily.

Purpose of the Study:

• * To quantify cellular oxygen utilization rates in mammalian cells.
• * To explore the relationship between cell characteristics and oxygen consumption.
• * To provide fundamental data for quantitative redox biology and systems biology.

Main Methods:

• * Review and synthesis of existing literature on cellular oxygen consumption.
• * Analysis of quantitative data on oxygen utilization rates across various cell types.
• * Correlation analysis between cell volume, protein content, and oxygen consumption rates.

Main Results:

• * Human daily oxygen requirement is approximately 22 moles, translating to an average cellular rate of 2.5 amol/cell/s.
• * Cellular oxygen utilization varies widely ( <1 to >350 amol/cell/s) based on cell type, function, and status.
• * A positive linear correlation exists between oxygen consumption, cell volume, and cell protein content.

Conclusions:

• * Cellular oxygen utilization is a fundamental aspect of cellular and tissue redox biology.
• * Quantitative data on oxygen consumption are essential for advancing redox systems biology.
• * Understanding oxygen's role is critical for comprehending complex mammalian physiology and evolution.