Distribution of p24 HTLV3 major core protein in lymph nodes of LAS patients.
Baroni CD., Pezzella F.
Lymph nodes of patients with lymphadenopathy syndrome (LAS) are characterized by two main histological patterns: hyperplastic reactive (H) and regressive (R). In both conditions, the paracortex (PC) is markedly activated with presence of selectively Ia-1+ high endothelial venules. Using a monoclonal antibody for p24, the major core protein of HTLV3, we have immunohistochemically determined the distribution of p24+ cells in lymph nodes from 23 LAS patients' HTLV3-ab serologically positive. p24+ cells were demonstrated in 11 cases. Control nodes were negative. p24+ cells included high endothelial cells of PC postcapillary venules, large perivenular cells, large mono- or binucleated cells in PC and in GC, and few lymphocytelike cells. Our preliminary observations indicate that the majority of p24+ cells are high endothelial and accessory cells that may act either as virus reservoir or as antigen-presenting cells to T4 lymphocytes and to GC B cells. In addition, the positivity of high endothelial cells for p24 might help to explain their selective Ia-1+.