What is it about?

This review explains how eukaryotic cells sense and adapt to fluctuations in oxygen availability. Because each cell type functions within a narrow optimal oxygen range, even small shifts—either hypoxia or hyperoxia—trigger specific transcriptional programs. The article discusses the central roles of HIF in low‑oxygen adaptation and Nrf2 in responses to oxidative stress or oxygen excess. It also highlights how NF‑κB integrates inflammatory and stress signals, influencing the final cellular outcome. The review focuses on the interplay between HIF, Nrf2, and NF‑κB, emphasizing that their activities are interdependent. Together, they coordinate transcriptional responses that help cells maintain adaptive homeostasis when oxygen levels vary.

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Why is it important?

Oxygen fluctuations occur in many physiological and pathological contexts, including inflammation, ischemia‑reperfusion, and cancer. Understanding how HIF, Nrf2, and NF‑κB cooperate or compete provides insight into how cells decide between repair, survival, or death when challenged by oxygen stress. This integrated view is relevant to human health because dysregulation of these pathways is implicated in tumor progression, chronic inflammation, and oxidative damage. The review also notes that numerous phytochemicals modulate these transcription factors, making them of interest in preventive nutrition and natural‑product pharmacology.

Perspectives

Although the interaction among HIF, Nrf2, and NF‑κB is well recognized, the review calls for systems‑biology approaches to better map their coordinated responses. High‑throughput and problem‑driven strategies may help clarify how nutrients, phytochemicals, and environmental factors influence these transcriptional networks. Future work must address how these pathways behave in complex biological environments—since much of the available evidence comes from reduced in vitro systems. Integrating more dynamic models of oxygen variation will be essential for understanding how cells maintain adaptive homeostasis in vivo.

Prof. Antonio Speciale
University of Messina

Read the Original

This page is a summary of: Need (more than) two to Tango : Multiple tools to adapt to changes in oxygen availability, BioFactors, February 2018, Wiley,
DOI: 10.1002/biof.1419.
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