Structural changes in skeletal muscles of the hind limbs of rats in acute ischemia-reperfusion and its correction by carbacetam, detected by polarization microscopy

  • T. O. Veresiuk I. Horbachevsky Ternopil National Medical University PHC of Ukraine, Ternopil, Ukraine
  • P. R. Selskyy I. Horbachevsky Ternopil National Medical University PHC of Ukraine, Ternopil, Ukraine
  • A. T. Televiak I. Horbachevsky Ternopil National Medical University PHC of Ukraine, Ternopil, Ukraine
Keywords: acute ischemia, reperfusion, skeletal muscles, polarization microscopy, arterial tourniquet, carbacetam.

Abstract

Arterial tourniquets are used in clinical practice for angioplasty and arthroplasty, and in case of limb injuries, their use often occurs according to vital signs. After removing the tourniquet and blood supply restoration to the limb arises a multifactorial lesion of tissues both ischemic and distant from the site of ischemia. A number of publications have been devoted to the study of morphological disorders in muscle tissue in acute ischemia-reperfusion in the medical literature. However, the researches for effective means for drug correction of these disorders still continues. The aim of the study was to explore peculiarities of skeletal muscle remodeling of the hind limbs of rats, detected by polarization microscopy, in acute ischemia-reperfusion, caused by the application of an arterial tourniquet, and in the correction of reperfusion disorders by carbacetam. Microscopic examination of histological sections of skeletal muscles of the hind limbs of 60 rats below the site of application of the tourniquet under conditions of experimental acute ischemia-reperfusion was performed. Acute ischemia for all animals was caused by application of SWAT rubber bands on the hind limbs of animals, 5–6 mm in width, at the inguinal fold level within 2 hours under thiopental anesthesia. A reperfusion was modeled by removing the tourniquet. Half of the experimental animals in the reperfusion period for the purpose of correction intraperitoneally was administered the nootropic drug 1-oxo-3.3.6-trimethyl-1.2.3.4-tetrahydroindolo[2.3-c]quinoline (carbacetam) at a dose of 5 mg per kilogram of body weight once a day during the entire reperfusion period. The histological specimens of the skeletal muscles were stained with hematoxylin and eosin, and were examined with a light microscope with polarization nozzle. Studies with using the polarization microscopy have shown that in the early reperfusion period morphological criteria for skeletal muscle remodeling expressed by deformation and anisotropy of muscle fibers, disappearance of their transverse striation, cracks and ruptures of fibers, and in the most severe cases there were signs of necrosis of the fibers with their fragmentation into separate lumps. Subject to the correction of reperfusion disorders by carbacetam, there is a decrease in the degree of damage and consistent acceleration of restoration of the skeletal muscles structure, which was the most pronounced in groups of animals with reperfusion terms after 1 and 14 days. Complex of features indicates, that at the tissue level the administration of carbacetam as reduces the ischemic-reperfusion lesion of the muscular fibers, as also accelerates the mechanisms of reparative rhabdomyohistogenesis. Thus, structural changes in the skeletal muscles of the limb after two-hour ischemia and subsequent reperfusion increased in the early reperfusion period and reached its peak after 1 day of reperfusion, and in the late period of reperfusion their reverse development took place. With the correction of disorders by carbacetam, the degree of damage was reduced and the recovery of the skeletal muscle structure of the limb was accelerated.

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Published
2020-09-30
How to Cite
Veresiuk, T. O., Selskyy, P. R., & Televiak, A. T. (2020). Structural changes in skeletal muscles of the hind limbs of rats in acute ischemia-reperfusion and its correction by carbacetam, detected by polarization microscopy. Biomedical and Biosocial Anthropology, (38), 30-35. https://doi.org/10.31393/bba38-2020-05