The determination of mineral density indices of the thigh bone by densitometry data in rats, for experimental fumonizinotoxycosis

Abstract

The article deals with the analytical methods that have allowed to provide detailed information on the material content of bones and structural organizations of both inorganic and organic bone components. The information provided in the present search may increase the knowledge of the influence of fumonisins on the structure and bone in general. On the basis of osteometric measurements, the geometry of the transverse section of the middle diaphysis is determined. They included a definition both the external and internal diameters of the transverse section of the middle of the diaphysis (both in the medial-lateral, and in the anterior-posterior area). The geometric properties are calculated: cortical cross-sectional area, average relative thickness of walls and cortical index. In addition, since during the force analysis, the bone was loaded in the anterior-posterior area, the vertical cortical index, the moment of inertia of the cross-section and the radius of rotation around the medial-lateral axis were calculated. According to the results of comprehensive studies, we found that the intoxication of animals with fumonisin did not affect the body weight and the weight of the femoral bones, although in the fumonisin-induced doses of rats there was a decrease in the mechanical and geometric properties of the bones. The values of mineral density of bone tissue did not differ between groups, but in the experimental group of animals that were fumonisin intoxicated, the mineral content of bone and the percentage of bone ash were lower than in the control group. A detailed mineral analysis of bones showed that the content of Ca, Cu, Fe, Mn, Sr and Zn in bones was significantly decreased in fumonisin intoxicated rats compared to the control group of animals. In addition, changes in the structure of the bone and mineral phase (reduction in the size of bone hydroxyapatite crystals) were noted. Seventy percent of the bones consist of inorganic mineral hydroxyapatite, which includes calcium phosphate, calcium carbonate, calcium fluoride, calcium hydroxide and citrate. This inorganic component is preferably crystalline, although it may be in amorphous forms. Replacement mechanisms occurring in bone hydroxyapatite include intercrystalline exchange and recrystallization due to the dissolution and reforming of crystals with the addition of new ions to the crystalline structure, which replace the Ca 2+ or adsorbed on the surface of the crystals. The mechanisms of replacement that was marked by changes in the group of animals from intoxicated with fumonisin, changes were noted in the structure of the bone and mineral phase, there was a decrease in the size of bone hydroxyapatite crystals.