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ACUTE OBSTRUCTIVE BRONCHITIS IN "FREQUENTLY ILL CHILDREN": SATUS
OF SYTOKINES
Urunova Manzura Allamuradovna
Pediatrician of the highest category at the Samarkand branch of the Republican Center for
Emergency Medical Care Samarkand, Uzbekistan
Tursunova Barno Abrorovna
Pediatrician of the highest category at the Samarkand branch of the Republican Center for
Emergency Medical Care Samarkand, Uzbekistan
Allanazarov Alisher Boymurotovich
Assistant of the Department №1 of Pediatrics and Neonatology,
Samarkand State Medical University, Samarkand, Uzbekistan
https://doi.org/10.5281/zenodo.15592465
Abstract. Acute obstructive bronchitis remains one of the most prevalent and severe
respiratory diseases in children. Understanding the pathogenetic role of immune status and
cytokines can provide deeper insight into the mechanisms underlying the development of AOB.
This knowledge is essential for developing effective diagnostic and treatment strategies for
frequently ill children.
The primary focus of scientific research is to investigate the mechanisms of disease
progression, identify the clinical features, and assess the impact of immune status and cytokines
in acute obstructive bronchitis among frequently ill children. The goal is to develop
pathogenetically based treatment methods and preventive measures.
In our country, extensive efforts are being made to ensure early diagnosis and prevention
of somatic diseases in children, with particular emphasis on bronchopulmonary pathology.
Keywords: obstructive bronchitis, cytokines, immunity, frequently ill children.
Relevance.
In pediatric practice, one of the key modern diagnostic markers for
identifying "frequently ill children" is the assessment of local and systemic immune parameters,
as well as inflammatory and anti-inflammatory cytokines. However, their role in the
development of pathological processes is primarily considered from the perspective of their
interactions. It is well established that recurrent respiratory illnesses in children, including acute
obstructive bronchitis, disrupt compensatory-adaptive mechanisms, leading to chronic recurrent
infections and impairments in both cellular and humoral immunity [1,3,8].
In children, viral infections often result in a weakened respiratory defense system,
allowing viruses to persist and replicate in the epithelium. In allergic reactions affecting the
respiratory mucosa, inflammatory metabolites trigger the release of inflammatory mediators.
Meanwhile, immune system alterations contribute to the formation of cytotoxic antibodies within
the bronchial submucosa, ultimately leading to obstructive syndrome [6,9]. Several researchers
highlight the significance of cytokine profiling in patients with obstructive bronchitis, as an
imbalance in cytokine levels is a key driver of inflammation in the respiratory tract [2,4]. The
investigation of cytokines’ role in disease pathogenesis remains highly relevant today [7,11].
Cytokines are glycosylated polypeptides that regulate immune responses. Based on their
biological activity, they are classified into regulators of humoral and cellular immunity,
mediators of allergic reactions, or modulators of immunosuppressive responses [5,12]. Their role
in controlling inflammation is crucial in the pathogenesis of obstructive bronchitis [10].
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Objective of the study.
To examine the cytokine profile in children with acute
obstructive bronchitis who experience frequent illness.
Materials and methods.
To assess correlations with cytokine profile indicators, a study
was conducted involving 120 patients diagnosed with acute obstructive bronchitis. The
participants were divided into two groups: Group I – 40 patients with acute obstructive
bronchitis classified as "episodically ill children. "Group II – 80 patients with acute obstructive
bronchitis belonging to the "frequently ill children" category.
Results.
Interleukins play a crucial role in various biological processes, including the
activation, differentiation, and proliferation of immune cells, as well as in the regulation of
innate and adaptive immune responses and inflammation.
The rise in cytokine levels results from the impact of infectious agents that trigger acute
obstructive bronchitis. Their equilibrium plays a crucial role in determining the disease
progression and prognosis.
The elevated IL-1 levels in Group I, considering its involvement in inflammatory
responses, contribute to airway swelling and narrowing, a hallmark of obstructive bronchitis in
children. IL-4, primarily secreted by T-lymphocytes and basophils, promotes IgE synthesis,
thereby intensifying allergic reactions in the bronchi during acute obstructive bronchitis.
In children with episodic disease, the moderate elevation of IL-6 in the bloodstream
confirms the presence of inflammatory and infectious processes in the respiratory tract.
However, excessive IL-6 levels may amplify the inflammatory response and worsen disease
symptoms. The IL-8 concentration in episodic acute obstructive bronchitis patients increased to
19.85 ± 0.73 pg/ml, reflecting an inflammatory reaction in the respiratory tract. This activates
neutrophils, which play a critical role in immune defense and indicate a dominance of cellular
immunity over humoral immunity. However, excessive neutrophil activation may exacerbate
pathological inflammation, leading to lung tissue damage.
An increased IL-10 level in children with acute obstructive bronchitis may suggest the
div's attempt to regulate and mitigate inflammation. Additionally, the elevated TNF-α levels in
acute obstructive bronchitis serve as an essential component of the innate immune response. In
reaction to infection, TNF-α inhibits the proliferation of intracellular pathogens while
simultaneously functioning as an immune regulator, signaling the activation of the immune
system and the ongoing inflammatory process. [Khaitov R.M. Immunology, 2016. – 496p.
In the group of frequently ill children, the progression of acute obstructive bronchitis was
accompanied by an increase in cytokine levels in the bloodstream. Compared to standard values,
IL-1 levels rose by 3.6 times, IL-4 by 2 times, IL-6 by 1.3 times, IL-8 by 2.2 times, IL-10 by 3.2
times, and TNF-α by 1.3 times (P<0.01, P<0.001). However, in comparison with children
experiencing episodic acute obstructive bronchitis, IL-1 was 0.7 times lower, IL-4 was reduced
by 0.8 times, IL-6 and IL-8 by 1.2 times, IL-10 by 1.5 times, and TNF-α by 1.1 times (R<0.01,
R<0.001). This imbalance serves as a hallmark of pulmonary impairment in this group,
emphasizing a distinct immune response pattern in frequently ill children.
IL-1, a key regulator of inflammation and immunity, plays a pivotal role in the activation
of T- and B-lymphocytes. Its elevated concentration (22.25 ± 0.42 pg/ml) in frequently ill
children with acute obstructive bronchitis intensifies inflammatory processes in the respiratory
tract, contributing to a more severe disease course.
A lower IL-4 level in Group II (9.60 ± 0.18 pg/ml) compared to Group I (12.60 ± 0.24
pg/ml, P<0.001) suggests a diminished allergic response in frequently ill children with acute
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obstructive bronchitis.
The increase in IL-6 levels (22.95 ± 0.39 pg/ml) in this group reflects an intensified
immune response, stimulating the synthesis of other inflammatory and anti-inflammatory
cytokines, including IL-10 and TNF-α, which play a role in modulating the disease’s
inflammatory processes.
In acute obstructive bronchitis, IL-8 levels (23.25 ± 0.40 pg/ml) were significantly
elevated compared to normal (P<0.001) and episodic cases (P<0.01). IL-8 functions by recruiting
neutrophils to the site of inflammation, forming part of systemic immune reactions. However,
excessive neutrophil activation may lead to tissue damage and exacerbate airway obstruction.
An increased IL-10 level (33.12 ± 0.70 pg/ml) in frequently ill children compared to the
control group indicates its dual function in immune regulation. While IL-10 has protective anti-
inflammatory properties by suppressing pro-inflammatory cytokine production and reducing
inflammation, it may also inhibit immune cell activation, potentially prolonging the disease and
increasing the risk of complications.
The serum TNF-α concentration (32.16 ± 0.70 pg/ml) was significantly higher in children
with acute obstructive bronchitis than in the control group (P<0.01). TNF-α is a crucial mediator
of early cytokine responses, playing a key role in antiviral defense. Its increased levels suggest
its involvement in inflammatory processes and immune activation, contributing to disease
pathogenesis.
These findings emphasize the essential role of interleukins in the development of acute
obstructive bronchitis in frequently ill children. Their concentrations can serve as biomarkers for
disease severity, highlighting the importance of monitoring cytokine fluctuations in this group.
Studying these immune markers is crucial for advancing diagnostic and therapeutic strategies for
acute obstructive bronchitis.
Elevated levels of both anti-inflammatory (IL-1 increased 4.8 times, IL-4 by 2.6 times,
IL-10 by 2.2 times) and pro-inflammatory (IL-6 increased 1.1 times, IL-8 by 1.9 times, and
TNF-α by 1.2 times) interleukins were observed compared to normal values (P<0.01, P<0.001).
These findings underscore the importance of pathogenic mechanisms in bronchial obstruction
syndrome and highlight the need to regulate immune responses to control disease progression.
Summary.
The research demonstrated that cytokines serve as key mediators in the
pathogenesis of the disease, orchestrating immune cell activation and inflammatory responses
within the respiratory system. Gaining a deeper understanding of their role in obstructive
bronchitis in children can shed light on the underlying disease mechanisms, its clinical
progression, and potential strategies for diagnosis and treatment.
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