Morphological Features of Spleen Tissue After Introduction of Fluorouracil and Cryopreserved Cord Blood Nucleated Cells

We studied the effect of administered cryopreserved nucleated cells of human cord blood (cCBNCs) on murine spleen tissue morphology under hemo- and immunosuppression induced by a single intraperitoneal injection of 5-fluorouracil (5-FU) antimetabolite of nucleic metabolism in the maximum tolerated dose. Progressing changes, typical for a damage caused by toxic substances, such as: congestion, exudation and leukocytes infiltration of spleen pulp; accumulation of macrophages either with phagocytized lymphocytes or their fragments; degenerative and necrotic changes in tissue elements of the pulp and follicles were revealed in spleen following  5‑FU introduction within entire observation period (16 days). A high degree of murine spleen reactivity in response to the administration of cryopreserved cord blood cells was found. To day 2 after cCBNCs administration we observed structural rearrangements in spleen, and already 10 days later 5-FU antimetabolite toxic injury the organ structure was back to the norm. Probl Cryobiol Cryomed 2016; 26(3): 249–258