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American Focus > Blog > Health and Wellness > Why the early hours of the day can be especially dangerous to our health
Health and Wellness

Why the early hours of the day can be especially dangerous to our health

Last updated: November 26, 2024 11:23 pm
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A groundbreaking study conducted by researchers from Prof. Gad Asher’s laboratory at the Weizmann Institute of Science’s Biomolecular Sciences Department has shed light on why asthma, heart attacks, and various other health conditions tend to occur in the early hours of the morning. Published in Cell Metabolism, the study reveals a fascinating connection between the body’s circadian clock and its response to oxygen deficiency.

The study focused on the role of the BMAL1 protein, a key component of the circadian clock, in regulating the body’s response to oxygen deficiency. The researchers found that BMAL1 is essential for stabilizing and activating the HIF-1α protein, which is crucial for responding to a lack of oxygen. This discovery suggests that the circadian clock not only responds to oxygen deficiency but also activates the body’s mechanism for coping with it.

To further investigate this relationship, the researchers genetically engineered mice to lack either HIF-1α, BMAL1, or both proteins in their liver tissue. They discovered that the absence of BMAL1 impaired the accumulation of HIF-1α in response to oxygen shortage, highlighting the importance of these proteins in the body’s oxygen response.

Interestingly, mice lacking both HIF-1α and BMAL1 had significantly lower survival rates under oxygen deficiency conditions, especially during the nighttime. This finding indicates a time-dependent role for these proteins in dealing with oxygen deficiency, with BMAL1 playing a crucial role in activating the genetic response needed to cope with oxygen shortage.

Furthermore, the study uncovered a potential link between liver damage and lung function in mice lacking both proteins. These mice exhibited low blood oxygen levels and signs of hepatopulmonary syndrome, a condition where blood vessels in the lungs dilate, impairing oxygen absorption. The researchers identified increased production of nitric oxide in the lungs as a possible cause, suggesting a communication breakdown between the liver and lungs.

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These findings could have significant implications for understanding oxygen-related diseases and developing targeted therapies. The researchers are now exploring the potential of these proteins as therapeutic targets for hepatopulmonary syndrome in humans. Overall, this study provides valuable insights into the complex relationship between circadian rhythms, oxygen response, and overall health.

For more information, you can access the full study published in Cell Metabolism (DOI: 10.1016/j.cmet.2024.07.003) by Vaishnavi Dandavate et al. This research was conducted at the Weizmann Institute of Science and offers promising avenues for future medical advancements in understanding and treating oxygen-related health conditions.

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