Tag Archives: histological analysis
Indicators of musculus soleus contractility disorder in obese rats
D. M. Nozdrenko, O. V. Rizun, O. O. Kalmukova,
M. Yu. Kuznietsova, N. G. Raksha, T. I. Halenova*,
O. V. Lynchak, Yu. I. Prylutskyy
Taras Shevchenko National University of Kyiv, Ukraine;
*e-mail: galenovatanya@knu.ua
Received: 23 October 2025; Revised: 12 November 2025;
Accepted: 30 January 2026; Available on-line: February 2026
Obesity has become a widespread issue across the globe, reaching epidemic proportions. Being overweight is a known risk factor for developing impairments in muscle performance. The aim of the study was to estimate mechanokinetic parameters of musculus soleus contraction in obese animals to better understand the possible impact of obesity on muscle contractile activity, tissue structure and appearance of damage markers in the blood. Experiments were carried out on 40 male white non-linear rats, divided equally into two groups. Control group were fed a standard diet for 10 weeks. Rats in the obesity group were maintained on a high-fat diet for the same time period. At the end of the experiment animals were anesthetized, musculus soleus was dissected, the ventral roots were severed from the spinal cord. Stimulation was performed by electrical impulses generated by a pulse generator. Tissue samples histological analysis was done with the use of Van Gieson’s trichrome and Sudan Black staining. Creatinine concentration, creatine phosphokinase (CPK) and lactate dehydrogenase (LDH) activity in the blood was determined. Reduction in musculus soleus maximum contraction force and muscle force impulse, prolonged relaxation time and delayed muscle return to initial state in obese animals as compared to control group were detected indicating on skeletal muscle fatigue. The appearance of intramyocellular lipid droplets and increased amount of intramuscular collagen fibers in the muscle tissue, as well as the elevated creatinine level and increased LDH and CPK activity in the blood, confirmed the impairment of muscle state in obese rat.
Efficacy of human heparin-binding EGF-like growth factor in healing experimental chemical burns
L. M. Dronko1, T. M. Lutsenko1*, O. I. Golembiovska1,
T. Yu. Trokhymchuk2, M. A. Arkhypova2, V. A. Dibrova2, Yu. V. Dibrova2,
S. L. Rybalko2, S. A. Myakushko3, A. A. Siromolot3,4, O. Yu. Galkin1,4
1National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv;
2SІ “L.V. Gromashevskyi Institute of Epidemiology and Infectious Diseases
of the NAMS of Ukraine”, Kyiv, Ukraine;
3ESC “Institute of Biology and Medicine”, Taras Shevchenko National University of Kyiv, Ukraine;
4Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, Kyiv;
*e-mail: lutsenko.tetiana@lll.kpi.ua
Received: 25 December 2024; Revised: 07 February 2025;
Accepted: 25 April 2025; Available on-line: 12 May 2025
According to the WHO, burns are the third most common cause of traumatic skin injuries. Chemical burns are characterized by a complex course and a long healing process. The use of the representatives of the epidermal growth factor family seems to be a promising direction in the treatment of chemical burns. The aim of this study was to evaluate the effectiveness of the recombinant human heparin-binding EGF-like growth factor (rhHB-EGF) in treating burn wounds in mice. The expression of a recombinant human HB-EGF analog was induced in the prokaryotic system E. coli BL21 Star, the protein was isolated, purified and its preparations in PBS or in a form of gel containing sodium hyaluronate and potassium sorbate were obtained. The burn wound was simulated in white non-inbred mice by subcutaneous injection of 10% paraformaldehyde solution, healing was observed for 17 days. The initial wound area was measured on the 7th day after the burn injury when the treatment was started. The mice with burn injury were divided into groups of 3 each – untreated mice (control), treated with different preparations: gel without rhHB-EGF; rhHB-EGF in a gel form; rhHB-EGF in PBS solution. The preparations (100 μl, 1.5 mg of rhHB-EGF) were applied to burn wounds daily for 5 days. Wound area, healing rate and histological patterns of skin samples were estimated. It was shown that groups with burn injury treated with HB-EGF protein (both in solution and gel form) demonstrated an advantage in reducing the wound area and inflammatory cells infiltration, improving healing rate, increasing the proliferative activity of epithelial cells and neovascularization as compared with the untreated group. Thus, the use of rhHB-EGF is a promising direction in the treatment of skin wounds.