The Journal of Immunology, Vol 159, Issue 12 5841-5852, Copyright © 1997 by American Association of Immunologists

ARTICLES

Immunohistochemical analysis of in vivo patterns of TRAF-3 expression, a member of the TNF receptor-associated factor family

S Krajewski, JM Zapata, M Krajewska, T VanArsdale, A Shabaik, RD Gascoyne and JC Reed
The Burnham Institute, La Jolla, CA 92037, USA.

An immunohistochemical approach was used to explore the in vivo expression of TNF receptor-associated factor 3 (TRAF-3), a putative signaling protein that binds to the cytosolic domains of CD30, CD40, and lymphotoxin-beta receptors. TRAF-3 immunostaining was detected in many types of cells throughout the human body. TRAF-3 immunostaining was only rarely present in thymocytes but was found in the thymic epithelioreticular cells. Lymphocytes in the bone marrow were also typically TRAF-3 immunonegative, whereas myeloid progenitor cells and megakaryocytes were often TRAF-3 positive. Peripheral blood lymphocytes were mostly TRAF-3 immunonegative, while granulocytes were TRAF-3 immunopositive. Monocytes were strongly immunostained for TRAF-3, but macrophages in nodes typically contained little or no TRAF-3 immunoreactivity. Some lymphocytes within the germinal centers of secondary lymphoid follicles in normal and reactive nodes were TRAF-3 immunopositive, as were occasional interfollicular lymphocytes in the T cell regions of these organs, but most lymphocytes appeared to be TRAF- 3 immunonegative or stained only weakly. Plasma cells, however, were strongly TRAF-3 positive. Stimulation of PBLs with anti-CD3 Ab induced marked increases in the steady state levels of TRAF-3 protein in vitro as determined by immunoblotting, while levels of TRAF-2 were unchanged, implying a dynamic regulation of TRAF-3 expression. The findings establish for the first time the cell type- and differentiation- specific patterns of expression of a member of the TRAF family of proteins.

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