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«Наука через призму времени»
Декабрь, 2025 / Международный научный журнал
«Наука через призму времени» №12 (105) 2025
Автор: Ёлдашова Акджагул Тойлыевна, преподаватель истории
Рубрика: Педагогические науки
Название статьи: Инновационные технологии в преподавании истории Туркменистана
Дата публикации: 12.12.2025
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УДК 61
IMPACT OF
CIRCADIAN RHYTHM DISRUPTION ON METABOLIC HEALTH AND INSULIN SENSITIVITY
Agayeva D.
Teacher,
Hudayberdiyeva M.
Student
The
International University of Industrialists and Entrepreneurs
Ashgabat,
Turkmenistan
Abstract. The circadian system acts as the
body's intrinsic timekeeper, orchestrating nearly all physiological processes,
including metabolism, in anticipation of 24-hour environmental changes. This
study investigates the profound consequences of circadian rhythm disruption
(CRD), induced by factors such as shift work, jet lag, or chronic sleep
deprivation, on overall metabolic health and, specifically, insulin sensitivity.
Maintaining synchrony between central (suprachiasmatic nucleus) and peripheral
(liver, muscle, adipose tissue) biological clocks is essential for regulating
glucose and lipid homeostasis.
Keywords: circadian rhythm disruption (CRD),
metabolic health, insulin sensitivity, metabolic syndrome, type 2 diabetes
mellitus (T2DM), central clock, peripheral clocks, glucose homeostasis, shift
work, chronotherapy.
The
circadian system is an endogenous timekeeping mechanism that precisely
regulates physiological and behavioral processes over approximately a 24-hour
cycle. This internal clock allows organisms to anticipate and adapt to regular
environmental changes, such as the light-dark cycle and feeding times.
Maintaining this temporal organization is fundamental for optimal cellular
function and systemic homeostasis across all mammalian systems.
At the
core of this system lies the master clock, located in the suprachiasmatic
nucleus (SCN) of the hypothalamus. The SCN synchronizes all the peripheral
clocks found in organs like the liver, pancreas, muscle, and adipose tissue,
ensuring all bodily functions occur at the most energetically favorable time of
day. This hierarchical coordination is vital for efficient energy storage and
utilization.
Circadian
rhythm disruption (CRD) occurs when the synchronization between the internal
biological clocks and the external environment is lost. Common causes of CRD
include shift work, chronic sleep restriction, frequent jet lag, and misaligned
eating patterns. These modern lifestyle factors pose significant challenges to
the body’s established metabolic schedule.
The
metabolic system, which governs the processing of nutrients, is profoundly
rhythmic, with distinct peak times for glucose uptake, lipid synthesis, and
hormonal secretion. Maintaining these rhythms is essential for ensuring that
metabolic resources are handled appropriately, matching the body's activity and
resting periods. CRD fundamentally compromises this efficient time-management
system.
A primary
consequence of CRD is the impairment of insulin sensitivity, which refers to
how effectively cells respond to insulin to take up glucose from the
bloodstream. When peripheral clocks in metabolically active tissues become
desynchronized from the SCN, cells fail to respond properly to rhythmic insulin
signals, leading to higher baseline glucose levels.
Chronic
desynchrony forces metabolic organs to operate at inappropriate times,
disrupting the rhythmic expression of core clock genes, such as CLOCK
and BMAL1. These genes directly regulate the expression of crucial
metabolic enzymes and transporters, meaning their misalignment leads to
widespread metabolic inefficiency.
Epidemiological
evidence strongly links CRD, particularly in occupational shift workers, with
an increased prevalence of metabolic syndrome. This constellation of risk
factors includes abdominal obesity, high blood pressure, elevated blood
glucose, and abnormal lipid levels, all precursors to serious chronic disease.
The
profound disruption of the sleep-wake cycle that characterizes CRD
significantly alters the secretion patterns of key metabolic hormones. For
instance, the stress hormone cortisol often maintains an inappropriately high
evening level, while the normal nocturnal peak of growth hormone may be
suppressed, both of which negatively impact glucose metabolism.
CRD also
impacts the regulation of appetite-regulating hormones, ghrelin and leptin.
Misalignment can lead to elevated ghrelin (hunger hormone) and reduced leptin
(satiety hormone), promoting increased caloric intake, particularly late in the
day, contributing directly to weight gain and obesity.
The timing
of food intake, known as chrono-nutrition, is now recognized as nearly as
important as the content of the diet itself. Eating late at night, when
peripheral metabolic clocks are programmed for fasting and rest, exacerbates
postprandial glucose intolerance and further diminishes insulin sensitivity in
muscle and liver tissue.
The liver
plays a central role in glucose homeostasis, rhythmically controlling glucose
production and glycogen storage. When the liver’s clock is disrupted, its
ability to suppress glucose output during fasting or to manage post-meal
processing is severely compromised, directly feeding into the pathology of type
2 diabetes mellitus (T2DM).
Furthermore,
CRD negatively affects pancreatic $\beta$-cell function, which is responsible
for insulin secretion. Studies suggest that the rhythmic nature of insulin
secretion is dampened or distorted during chronic desynchrony, leading to
insufficient insulin release at critical times, thereby contributing to
hyperglycemia.
At the
cellular level, CRD is associated with an increase in systemic low-grade
inflammation. This chronic inflammatory state is known to directly interfere
with insulin signaling pathways within muscle and fat cells, acting as a major
contributor to peripheral insulin resistance.
The
molecular mechanism involves altered signaling cascades, including those
related to the $\text{AMPK}$ and $\text{mTOR}$
pathways, which are typically under circadian control. When these energy
sensors are misregulated, the cell loses its ability
to correctly switch between anabolic (building) and catabolic (breaking down)
states throughout the 24-hour cycle.
Genetic
polymorphisms in core clock genes, such as PER2 or BMAL1, have
been shown to modify an individual’s susceptibility to metabolic disorders when
exposed to CRD environments. This indicates a complex gene-environment
interaction governing metabolic risk under modern lifestyle pressures.
The
evidence underscores the necessity of considering temporal factors when
designing therapeutic interventions for metabolic diseases. Traditional
treatments focused solely on diet and exercise may be suboptimal if the
patient’s underlying circadian rhythms remain misaligned due to lifestyle or
occupational factors.
Therefore,
this research aims to synthesize the current understanding of the molecular and
physiological pathways linking CRD to compromised metabolic health and insulin
sensitivity. A deeper mechanistic understanding is essential for bridging the
gap between basic chronobiology and clinical practice.
Ultimately,
the findings will support the development of chrono-therapeutic strategies,
such as time-restricted feeding and timed exercise regimens, that leverage the
body’s natural rhythms to prevent, manage, and potentially reverse metabolic
dysfunction associated with modern patterns of living.
Reference:
- Panda, S. (2016). Circadian physiology of metabolism. Science, 354(6315), 1008–1015.
- Eckel-Mahan, K. L., & Sassone-Corsi, P. (2013). Metabolism and the circadian clock: the next frontier. Nature Reviews Endocrinology, 10(1), 4–15.
- Rutter, J., Reick, M., Wu, M., Maloof, J., & Schotland, P. (2002). Regulation of key metabolic enzyme genes by the circadian clock. Science, 296(5575), 1837–1841.
- Shafi, T., & Taveras, P. (2020). Circadian Rhythm Disruption and Type 2 Diabetes Mellitus: A Pathophysiologic Link. Endocrinology and Metabolism Clinics of North America, 49(3), 441–453.
- Turek, F. W., Joshu, C., Kohsaka, A., Lin, E., Ivanova, G., McDearmon, M. A., Bass, J. (2005). Obesity and metabolic syndrome in mice with mutations in Bmal1 and Clock. Science, 308(5724), 1043–1045.
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