Role of Hemopoietic Precursors of Various Classes in the Effect of Granulocyte Colony-Stimulating Factor on Hemopoiesis during Cytostatic-Induced Myelosuppression

Antifibrotic effects of immobilized hyaluronidase in repeated bleomycin-induced lesions of the alveolar epithelium

Antifibrotic activity of testicular hyaluronidase, immobilized on polyethylenoxide and obtained by electron beam synthesis, was studied on the model of bleomycin injuries to the alveolar epithelium (irreversible pneumofibrosis) in C57Bl/6 mice and compared to the effect of testicular hyaluronidase. Intranasal therapy with immobilized and testicular hyaluronidases prevented the deposition of fibrotic mass in the parenchyma of "bleomycin" lungs. The effect of immobilized hyaluronidase was more pronounced than that of testicular hyaluronidase. The studied compounds were virtually inessential for infiltration of the alveolar interstitium and alveolar tracts by lymphocytes, macrophages, neutrophils, and plasma cells. Unchanged histoarchitectonics of bleomycin-damaged lungs in immobilized hyaluronidase therapy was due to suppression of the progenitor fibroblast cells (CD45(-)).

Antifibrotic activity of conjugates based on amphiphilic pluronic F68 and hydrophobic pluronic L31 with hyaluronate-endo-β-N-acetylhexosaminidase in pulmonary fibrosis

Antifibrotic activity of intranasally administered conjugates of pluronics L31 and F68 with hyaluronate-endo-β-N-acetylhexosaminidase was studied in C57Bl/6 mice under conditions of single and repeated bleomycin-induced injury to the alveolar epithelium. Conjugates were prepared using the technique of protein immobilization with ionizing radiation. We demonstrate that in cases of single and repeated injuries to the alveolar epithelium, the conjugates administered during phases of inflammation or deposition of fibrotic masses prevent the development of pulmonary fibrosis. The conjugates demonstrated more pronounced antifibrotic activity than hyaluronate-endo-β-N-acetylhexosaminidase. The conjugate based on hydrophobic pluronic L31 showed higher effectiveness in comparison with the conjugate based on amphiphilic pluronic F68.