Abstract
Emerging evidence indicates the importance of nucleosides and nucleotides in the maintenance of functions of the bone marrow hematopoietic cells, intestinal mucosa, and the brain, which have limited de novo synthesis of purine and pyrimidine bases. We have found that nucleosides and nucleotides stimulate hemopoieses and increase peripheral neutrophil counts in mice treated with cyclophosphoamide. Intraperitoneal administration of nucleosides and nucleotides decreased bacterial translocation, the number of colony-forming units, and increased survival against methicillin-resistant Staphylococcus aureus. In vitro immune studies in mice showed that nucleosides and nucleotides increase the delayed-type cutaneous hypersensitivity and the popliteal lymph node blastogenic response to antigens, allogens, and mitogens. Both intraperitoneal and oral administration of nucleosides and nucleotides reduced endotoxin-induced bacterial translocation and improved injury to the gut in protein-deficient mice. However, oral administration of nucleosides and nucleotides in experimental colitis resulted in a worsening of colitic conditions and increased interleukin-8 and tumor necrosis factor-alpha concentrations in inflamed colonic portions, indicat...Continue Reading
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