Recombinant CD30 ligand and CD40 ligand share common biological activities on Hodgkin and Reed‐Sternberg cells

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Abstract
The CD30 ligand (CD30L) and CD40L are members of the tumor necrosis factor (TNF) protein superfamily. CD30L and CD40L are mainly expressed as membrane‐bound proteins by activated T cells. CD30L and CD40L are costimulatory for T cell proliferation and activation. Further, CD40L is a critical signal for T cell‐dependent activation of B cells. Primary and cultured Hodgkin and Reed‐Sternberg (H‐RS) cells, the neoplastic component of Hodgkin's disease (HD), express high levels of the counterreceptors CD30 and CD40. We have found that both the recombinant CD30L and CD40L enhanced interleukin (IL)‐6, TNF and lymphotoxin (LT)‐α release from cultured H‐RS cells. In addition, CD40L, but not CD30L, induced IL‐8 secretion. CD30L and CD40L seem to share some redundant biological activities involved in the deregulated secretion of cytokines known to play a central role in the clinical presentation and pathology of HD. Further, CD30L enhanced surface expression of intercellular adhesion molecule‐1 (ICAM‐1/CD54) on cultured H‐RS cells, which is frequently overexpressed on primary H‐RS cells. CD30L‐ and CD40L‐enhanced CD54 surface expression is followed by elevated shedding of CD54, as shown by detection of elevated 82‐kDa soluble (s) CD54 levels in culture supernatants after stimulation with both ligands. CD30L and CD40L share common pleiotropic biological activities on CD30+/CD40+ H‐RS cells and are elements of the cytokine and cell contact‐dependent activation network typical for HD, a tumor of cytokine producing cells.

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