Structural and Functional Analysis of the Spermatogenic Epithelium in Rats Exposed to Titanium Dioxide Nanoparticles.

We studied immunohistochemical and morphometric characteristics of the spermatogenic epithelium in rats against the background of peroral administration of nanoparticles containing titanium dioxide. Substantial degenerative changes in the spermatogenic epithelium were revealed: thinning, disorganization of layers, and detachment of sperm cells from the basement membrane. Immunohistochemical analysis revealed reduced proliferative activity and differentiation potential of epithelial cells, which was confirmed by changes in the expression of Ki-67 and c-kit markers.

[Glycosaminoglycans dysbolism in pathogenesis of idiopathic varicocele].

Ultrasound dopplerography (UD) was used to examine 50 patients with idiopathic varicocele (IV) and 20 healthy subjects. Such parameters were assessed as age, severity of IV, its duration, scrotal vessels UD data, vein diameter of the pampiniform plexus on the left, reflux at the height of the Valsalva test, uronic acids (UA), glycosaminoglycanes (GAG) and their fractions (hialuronic acid--HA, chondroitin sulphates--CS, heparansulphates--HS). UA and GAG fraction composition was studied with ion exchange chromatography.

[Interaction of nucleic acids and glycans].

Spectrophotometric analysis and dot-hybridization have shown that amylose forms complexes with polypyrimidines (poly dC), while polyuronides form complexes with polypurines (poly dA). In addition, the formation of complexes genomic thymus DNA-hyaluronic acid has been observed. A certain role in the mechanism of NA-polysaccharide interactions can be played by the links between purines and the carboxylic group of hexuronic acid residue, as well as between pyrimidines and the hydroxymethyl group of hexose residue.

[Glycosaminoglycanes biosynthesis connection with nuclear and microsomal cell apparatus].

The polysaccharides fractional composition was characterized in rat liver. Glycosaminoglycanes (GAG) anabolism was studied with the help of 14C1-glucose used as the synthesis precursor. It was demonstrated that GAG polysaccharide fragments synthesis began in the cell nucleus associated structures and finished in the microsomal cell fraction.

[Biopolymers in urine of patients with syringomyelia].

Urine of patients with syringomyelia was analysed by gel filtration, ion-exchange chromatography and analytical chemistry methods. Increased level of acidic glycoproteins and decreased level glycosaminoglycans levels were found. Patients with syringomyelia had smaller glycosaminoglycans components of proteoglycans than normal subjects.