The Journal of Experimental Medicine
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The Journal of Experimental Medicine, Vol 140, 1260-1272, Copyright © 1974 by The Rockefeller University Press

ARTICLE

MACROPHAGE-LYMPHOCYTE CLUSTERS IN THE IMMUNE RESPONSE TO SOLUBLE PROTEIN ANTIGEN IN VITRO : II. Ultrastructure of Clusters Formed During the Early Response



Morten H. Nielsen 1, Henning Jensen 1, Otto Brændstrup 1, and Ole Werdelin 1

1 From the University Institute of Pathological Anatomy, University of Copenhagen, Denmark 2100 Ø

Macrophage-lymphocyte clusters are formed when lymph node cells and autologous peritoneal exudate cells from guinea pigs immunized with tubercle bacilli are cultured in the presence of purified protein derivative of tuberculin (PPD) for 20 h. We have studied the ultrastructure of these clusters employing transmission and scanning electron microscopy. The most simple macrophage-lymphocyte cluster consisted of one macrophage, one large central lymphocyte with a blastoid appearance attached to the macrophage with a broad area of contact, and from a few to more than 20 small peripheral lymphocytes attached to the central lymphocyte by their uropods. Some clusters were of more complex type, containing two or three macrophages or one macrophage with more than one central lymphocyte attached to the surface, but even in these clusters each peripheral lymphocyte was attached only to one central lymphocyte. By morphological criteria the peripheral lymphocytes were T lymphocytes.

Submitted on June 25, 1974


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