Role of target and effector cell structures in natural killer-mediated cytotoxicity |
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Authors: | Pier Luigi Tazzari Daniela Zauli Donatella Raspadori Cristina Crespi Monica Magnani Angela Tassinari Marco Gobbi |
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Affiliation: | (1) Istituto di Ematologia ‘L. e A. Seràgnoli’, Università degli Studi di Bologna, Italia;(2) Istituto di Patologia Speciale Medica e Metodologia Clinica, Università degli Studi di Bologna Policlinico S. Orsola, Via Massarenti 9, 40138 Bologna, Italia |
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Abstract: | Summary An analysis of target and effector cell structures involved in thein vitro natural killer (NK)-mediated cytotoxicity has been performed. The degree of surface expression of transferrin receptor (TR) was only in part correlated with that of cell lysis. Moreover, the lysis could not be blocked by treating target cells with two anti-TR monoclonal antibodies. Finally, cell lines poorly affected by NK cells express TR only at the cytoplasmic level. As to the effector cells, the integrity of cytoskeleton components (especially microtubules) was found to be essential for the occurrence of cell lysis. In fact, vinblastine, an anti-microtubule agent, was able to significantly reduce the percentage cell lysis. This effect was not due to a selective depletion in NK cells induced by the drug. It is concluded that the mechanisms underlying NK activity are complex and involve both target and effector cell structures. This work was supported by a grant from theConsiglio Nazionale delle Ricerche (CNR), Roma, Italy,Progetto Finalizzato ‘Oncologia’ (contract n№ 85.02190.44). |
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Keywords: | Cytoskeleton Cytotoxicity Natural killer cells Transferrin receptor Vinblastine |
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