Abstract
We review our data suggesting that interactions between reactive and malignant T cells in lesions of cutaneous T cell lymphoma (CTCL) may play a role in the biology of CTCL. T cell receptor gene rearrangement (TCRGR) analysis allows the identification of the malignant clone on the basis of the unique size of the TCR gene fragments after enzyme digestion. We identified the malignant clone by TCRGR analysis of DNA extracts from lesionai skin of patients with CTCL, mycosis fungoides type, and compared the TCRGR pattern to that of T cell clones established from lesionai skin of the same patients. We found that each clone demonstrated a TCRGR pattern unique from the others and different from that of the malignant clone identified in the lesion. These data established that a polyclonal population of tumor infiltrating lymphocytes (TEL) are present in the lesion (and potentially regulating the malignant clone), and also suggest that the malignant clone and the TIL’s may have different activation requirements. Intralesional activation of malignant or TIL clones may be induced by abnormal antigen presenting cells (APC’s) in the lesion. We showed that lesionai CDla+ cells (Langerhans cells;LC), purified on immunomagnetic beads, demonstrated ultrastructural abnormalities such as hyperconvoluted nuclei and significant melanophagocytosis. In addition, these LC demonstrated strong expression of CD36, CD11c and CD1c, markers normally more highly expressed on dermal perivascular dendritic cells, in addition to expression of molecules present on normal LC, such as HLA-DR and CDla. Although these modulated LC are hyperstimulatory for autologous T cells, it is not yet clear whether they are stimulating the malignant clone or the TIL’s in the lesion. The balance between progression versus indolence may be related to complex interactions between the cells of the malignant clone, TIL’s, and APC’s.
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Cooper, K.D. et al. (1994). Activation of Reactive Versus Malignant T Cells in Cutaneous T Cell Lymphoma: Role of Abnormal Antigen Presenting Cells and T Cell Activating Molecules. In: Lambert, W.C., Giannotti, B., van Vloten, W.A. (eds) Basic Mechanisms of Physiologic and Aberrant Lymphoproliferation in the Skin. NATO ASI Series, vol 265. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1861-7_3
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DOI: https://doi.org/10.1007/978-1-4615-1861-7_3
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