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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
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Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures
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Circadian clock gates diurnal glucose utilization.

Yao D Cai1, Joanna C Chiu1

  • 1Department of Entomology and Nematology, College of Agricultural and Environmental Sciences, University of California Davis, Davis, California, United States of America.

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Summary

The study reveals how glucose metabolism in fruit flies changes throughout the day. These metabolic rhythms are disrupted in flies with faulty circadian clocks or sleep.

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Area of Science:

  • Chronobiology
  • Metabolic pathways
  • Cellular homeostasis

Background:

  • The circadian clock regulates physiological processes, including metabolism.
  • Disruptions in circadian rhythms are linked to metabolic disorders.
  • Understanding the interplay between circadian clocks and metabolism is crucial for maintaining health.

Purpose of the Study:

  • To investigate the time-of-day-dependent activities of glucose metabolic pathways in Drosophila.
  • To determine how circadian clock and sleep mutations affect these metabolic rhythms.

Main Methods:

  • Utilized metabolic tracing techniques in Drosophila.
  • Analyzed glucose metabolic pathways at different times of the day.
  • Compared metabolic activity in wild-type flies with clock and sleep mutants.

Main Results:

  • Identified distinct time-of-day-dependent activities within glucose metabolic pathways.
  • Demonstrated that circadian clock mutants exhibit disrupted glucose metabolic rhythms.
  • Showcased that sleep mutants also display altered time-of-day-dependent metabolic patterns.

Conclusions:

  • Circadian clocks and glucose metabolism are tightly coordinated in Drosophila.
  • Disruptions in the circadian clock or sleep significantly impair metabolic timing.
  • Metabolic tracing is a valuable tool for dissecting circadian metabolic regulation.