MIGRATION OF NEWLY FORMED SMALL LYMPHOCYTES FROM BONE-MARROW TO LYMPH-NODES DURING PRIMARY IMMUNE-RESPONSES

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  • 1 January 1976
    • journal article
    • research article
    • Vol. 24  (3) , 515-526
Abstract
Selective DNA labeling of bone marrow cells in vivo was used to determine the effect of antigenic stimulation on the migration of small lymphocytes from bone marrow to popliteal lymph nodes. Following footpad injection of keyhole limpet hemocyanin (KLH) in guinea-pigs, the regional nodes showed an early increase in weight and cellularity together with a progressive increase in cell proliferation. When [3H]thymidine was injected into tibial and femoral marrow 2 days before KLH administration, the DNA radioactivity of the KLH-stimulated nodes increased rapidly and always exceeded that of contralateral nodes. Simultaneously, in radioautographic sections of lymph nodes labeled small lymphocytes, indicative of an origin from marrow precursors, appeared throughout the cortex, post-capillary venules, subcapsular sinus, medullary cords and sinuses. In KLH-stimulated nodes the number of labeled small lymphocytes per section was higher than in contralateral nodes, especially in the cortex, and some of these cells appeared in germinal centers. Labeled large blast cells and macrophages were also increased in numbers. Similar changes were observed in lymph nodes of parental strain rats following intramyeloid [3H]thymidine administration and footpad injection of lymphoid cells from F1 hybrid rats. During the early response of lymph nodes to various antigens, local changes in cell traffic include an enhanced accumulation of newly formed small lymphocytes, putative virgin B [bone marrow-derived] lymphocytes, generated in the bone marrow prior to the antigenic stimulation.