Objective: The relevance of this study is conditioned by the need for urgent search and implementation of effective methods of treatment of urinary system diseases in people of different ages, as well as addressing issues of quality treatment of connective tissue diseases in general and its dysplasia in particular. The aim of the article is to identify congenital defects as visceral markers of connective tissue dysplasia.
Methods: The methodology of this study includes a survey of a group of children with considerable problems in the development and functioning of the urinary system at the age of 2 weeks to 3 years, in order to qualitatively select and determine the most effective methods of treatment. Children who took part in this study had a set of phenotypic and clinical properties of undifferentiated connective tissue dysplasia.
Results: The considerable prevalence of undifferentiated connective tissue dysplasia in young children with congenital malformations of the urinary system, especially in children with abnormal development and functioning of kidney tissue, which substantially influences the course of the disease was determined. Also, treatment of undifferentiated connective tissue dysplasia was predicted.

Conclusions: It was concluded that the presence of a malformation of the urinary system, which is acquired by a child from birth, can be considered as a visceral manifestation of undifferentiated connective tissue dysplasia.

The growing number, prevalence, numerous complications, and deaths in patients with congenital anomalies of the kidney and urinary tract
(CAKUT) indicate the high relevance of the declared topic. Currently, clinical medicine is actively engaged in research on the cellular and molecular mechanisms that cause the appearance of these diseases.

Aim: The aim of the work is to study genetic markers of CAKUT and the tendency to a more severe course of pyelonephritis in young children.

Material and methods: Using the multiplex polymerase chain reaction method, 50 children with pyelonephritis were examined for the presence of deletion alleles of the glutathione S-transferase mu 1 (GSTM1) and glutathione S-transferase theta 1 (GSTT1) genes.

Results and discussion: As a result, 35 children were diagnosed with certain CAKUT. A statistically significant associative relationship between the development of pyelonephritis in a child and the presence of a null allele GSTM1 0/0 in its genotype and a high probability of CAKUT with quantitative and positional anomalies and impaired formation and differentiation of renal tissue in carriers of null alleles GSTT1 0/0, GSTM1 0/0 in their combination was revealed.
Conclusions: The fact that different forms of abnormalities are detected in members of the same family suggests that certain genetic mutations can potentially lead to CAKUT syndrome, but the final phenotype of the renal system depends either on the genetic background or on environmental factors.

The purpose of this study is to substantiate the choice and evaluate the efectiveness of therapeutic tactics aimed at suppressing collagen formation and improving metabolic processes in the kidney parenchyma in young children with pyelonephritis against the background of vesicoureteral refux associated with undiferentiated tissue dysfunction. 67 children from 2 weeks to 3 years old with pyelonephritis and vesicoureteral refux were examined. All children during the period of remission of the infammatory process were examined for the content of oxyproline in the urine. Urine crystallinity and urinary excretion were determined, and markers of the morphofunctional state of the cytomembranes of the renal epithelium were determined: calcifcation test—the presence of polar lipids in the urine and test for the presence of lipid peroxidation products in the urine.
Children with high urinary hydroxyproline excretion prior to protocol treatment of pyelonephritis during the remission of the infammatory process at the stage of maintenance therapy were recommended to receive metabolic preparations that can inhibit collagen formation and improve parenchyma metabolic processes during the month—vitamin E 10% and l-carnitine in age-related doses. After 6 months, a study was made on the functional state of the renal parenchyma in the dynamics of treatment. After metabolic antihypoxic and membrane-protective therapy, there was a signifcant positive dynamic of all markers of tissue hypoxia and membrane destruction in the kidney parenchyma, which confrms the inhibition of collagen formation processes and a decrease in tissue hypoxia with vitamin E and l-carnitine in age-related doses.

The high incidence of children with recurrent episodes of acute obstructive bronchitis is a widespread problem. Correct identification of chil-
dren at risk of developing bronchial asthma at school age may improve treatment and prevention approaches to this pathology, but the ability to identify these children remains limited. The purpose of the study was to determine the effectiveness of recombinant interferon alpha-2β in
children with recurrent episodes of acute obstructive bronchitis in the course of treatment based on the assessment of cytokine profile. The
study examined 59 children of the main group with recurrent episodes of acute obstructive bronchitis and 30 children of the comparison group
who suffered from acute bronchitis, aged 2–8 years, who were in the hospital. The results of laboratory studies were compared with the data of
30 healthy children. In children with recurrent episodes of acute obstructive bronchitis, the content of serum interferon-γ and interleukin-4 was
significantly reduced compared to healthy children, after treatment with recombinant human interferon alpha-2β, the content of interferon-γ and
interleukin-4 in children significantly increased. The content of interleukin-1β in children with recurrent episodes of acute obstructive bronchitis
was significantly higher than in healthy children, after immunomodulatory therapy with recombinant interferon alpha-2β, interleukin-4 normalized
to its level in healthy children. It was found that children with recurrent episodes of acute obstructive bronchitis have an imbalance of cytokines,
the effectiveness of recombinant human interferon alpha-2β therapy, which normalized the levels of the studied cytokines in the serum.

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The prevalence of dysmetabolic nephropathies in children is increasing from year to year, representing a significant problem in the overall structure of kidney diseases in pediatric age. Despite numerous studies dedicated to the issue of dysmetabolic nephropathies in children, the role of epigenetic factors in the pathogenesis of dysmetabolic nephropathy with calcium oxalate crystalluria remains insufficiently explored.
Aim — to identify the leading epigenetic factors in the pathogenesis of dysmetabolic nephropathy with calcium oxalate crystalluria in children.
Materials and methods. The data from the medical histories and outpatient records of 173 children were studied. Each child was additionally
examined by narrow specialists of different profiles. Three groups were formed from the examined children: Group I — children with a complicated course of dysmetabolic nephropathy and a history of inflammatory processes in the urinary system (52 children), Group II — children with dysmetabolic nephropathy with persistent crystalluria (56 children) and the Control group, which included 65 healthy children.
Results. The most significant prenatal epigenetic factors are the threat of early miscarriage, gestosis of the first and second halves of pregnancy, maternal anemia during pregnancy, parental alcohol and tobacco use, mother's work on computer during pregnancy, presence of maternal
chronic diseases, parental exposure to industrial dust and noise, and heavy physical work of mother leading to fetal hypoxia.
Conclusion. The most significant postnatal epigenetic factors influencing children's susceptibility to a more severe course of dysmetabolic
nephropathy included low birth weight, early artificial feeding, frequent acute respiratory infections, atopic diathesis, and physiological jaundice
in the first year of life, as well as the presence of concomitant diseases such as chronic tonsillitis, dental caries, frequent acute respiratory infections, chronic gastritis, atopy, and chronic cholecystitis later in life.
The study was carried out in accordance with the principles of the Declaration of Helsinki. The study protocol was approved by the Local Ethics
Committee of these institutions. The informed consent of the children's parents was obtained for the research.
No conflict of interests was declared by the authors.