Most vertebrates upregulate anaerobic metabolism in severe hypoxia, which results in metabolic acidosis that must be resolved during reoxygenation. Naked mole-rats (NMRs) are hypoxia-tolerant mammals and drastically reduce their metabolic rate while maintaining systemic pH homeostasis during acute hypoxia. Whether or not NMRs employ anaerobic metabolism in hypoxia is currently debated. Given the robust systemic hypoxic hypometabolism of this species we hypothesized that anaerobic metabolism is recruited on a tissue-specific basis that varies between developmental stages and colony caste position. To test this, we treated subordinate juvenile and adult, and breeding (queen) NMRs in normoxia (21% O2) or hypoxia (3% O2) for 1 h, and then measured blood lactate, glycolytic enzyme activity, and the expression of genes that encode for enzymes involved in glycogen and glucose metabolism, and lactate transport. We found that (1) blood lactate levels increase similarly during hypoxia across developmental stages and castes; but that (2) glycolytic activity increased or remained stable in subordinates and juveniles but was unchanged or reduced in queens; (3) MCT4 gene expression decreased markedly in subordinate and juvenile brain and increased in muscle and kidney, but was unchanged in queens; and (4) the expression of genes associated with glycogenolysis and gluconeogenesis varied across tissues in subordinates/juveniles with some markers being down or upregulated or unchanged, but were always unchanged or downregulated queens. Taken together, our results suggest that hypoxia upregulates glycolysis and glycogen mobilization in subordinates and juveniles, but not in queens.
Severe acute hypoxia upregulates anaerobic metabolism in non-reproductive but not queen naked mole-rats
Open Access
Harnessing physiological research for smarter environmental policy
In their Perspective, Alexia Dubuc and colleagues discuss strategies to strengthen collaboration, communication and engagement between physiological researchers and environmental policy makers to ensure that conservation strategies address the threats posed by climate change.
JEB grants to support junior faculty
Learn about the grants that we launched in 2023 to support junior faculty from two of our awardees: Erin Leonard, Early-Career Researcher (ECR) Visiting Fellowship recipient, and Pauline Fleischmann, Research Partnership Kickstart Travel Grant recipient. The next deadline to apply is 28 November 2025.
Early testing could make risky falls a thing of the past for elderly people
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Meet the JEB team at SEB in Antwerp
JEB is proud to be sponsoring the annual meeting of the Society for Experimental Biology, taking place on 8-11 July in Antwerp, Belgium. Come and introduce yourself at our exhibition stands, at booths 3 and 4 throughout the meeting. Editors Craig Franklin, Katie Gilmour and Sanjay Sane, and Features and Reviews Editor Jarren Kay will be also available for questions at our ‘Meet the Editors’ session from 13:00 – 14:00 in Marble Hall on 8 July, where you can find out about the journal and pick up our exclusive 2025 T-shirt.
Fast & Fair peer review
Our sister journal Biology Open has recently launched the next phase of their Fast & Fair peer review initiative: offering high-quality peer review within 7 working days. To learn more about BiO’s progress and future plans, read the Editorial by Daniel Gorelick, or visit the Fast & Fair peer review page.
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