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- W1968804518 abstract "The isotype of anti-CD3 mAb has a dramatic effect on anti-CD3 induced T-cell activation, as was previously reported for switch variants (lgG2b to IgA) of a high-avidity IgG1 anti-CD3 mAb (CLB-T3/4.1). In order to study and compare the isotype dependency of T-cell activation with anti-CD3 mAb of various mouse and human subclasses, we now prepared recombinant anti-CD3 mAb. The variable region of the anti-CD3 lg heavy chain was cloned, joined with genes for the heavy chain constant region and expressed in a cell line only secreting autologous mouse x light chains. Thus we obtained cell lines that produced mouse (m) IgM, mlgG3 and chimaeric mouse/human (h) lgM, hlgG1, hlgG2, hlgG3, hlgG4, hlgE and hlgA2 anti-CD3. The matched set of mouse and mouse/human chimaeric anti-CD3 isotype switch variants was then used to study activation of T cells in an accessory cell-dependent system. hlgG1, hlgG4, hlgE, mlgG2a and mlgE induced T-cell proliferation in PBMC of all donors tested, whereas PBMC from a subset of donors were unresponsive to stimulation with hlgG2, hlgG3, hlgA2, mlgG1 and mlgG2b anti-CD3 mAb. hlgM, mlgM and mlgA were only able to induce T-cell mitogenesis in combination with PMA. Our panel of anti-CD3 mAb variants may prove a powerful tool to study mouse and human isotype-dependent effector functions and their influence on T-cell activation requirements in detail. L'isotype des anticorps monoclonaux (mAb) anti-CD3 joue un rôle trés important dans l'activation des cellules T induite par les anti-CD3 comme cela aété observé pour les variants de commutation (de IgG2b à IgA), s'agissant des mAb de la sous-classe des IgG1 de grande avidité (CLB-T3/4.1). Afin d'étudier et de comparer l'activation des cellules T isotype-dépendantes en utilisant des mAb anti-CD3 de diverses sous-classes de la souris et de l'homme, nous avons préparé des mAb recombinants. La région variable de la chaîne lourde des Ig anti-CD3 a été clonée, en liaison avec les génes codant pour la région constante, puis exprimée dans une lignée cellulaire ne sécrétant que des chaînes légères x autologues de souris. Nous avons ainsi obtenu des lignées produisant des mIgG (m=souris), des mIgG3 et des hIgM (h=chimériques homme/souris), hIgGl, hIgG2, hIgG3, hIgG4, hIgE et hIgA2 anti-CD3. Un assortissement de variants isotypiques murins et chimériques anti-CD3 a ensuite été utilisé popur étudier l'activation des cellules T dans un système dépendant de cellules ⪡accessoires⪢. Les hIgG1, hIgG4, hIgE, mIgG2a et mIgE ont induit une prolifération T chez les cellules mononucléées sanguines périphériques de tous les donneurs examinés, alors que les cellules mononucléées d'une sous-population de donneurs se sont montrés insensibles à la stimulation par les mAb hIgG2, hIgG3, hIgA2, mIgG1 et mIgG2b anti-CD3. Les mIgM et mIgA n'étaient capables d'induire une mitogenése T qu'en présence de PMA. Notre lot de mAb anti-CD3 variants peut s'avérer un outil performant dans l'analyse des fonctions effectrices isotype-dependentes (de la souris et de l'homme) et précisément de leur influence dans les conditions de l'activation des cellules T." @default.
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- W1968804518 date "1991-01-01" @default.
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- W1968804518 title "Induction of T-cell proliferation by recombinant mouse and chimeric mouse/human anti-CD3 monoclonal antibodies" @default.
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- W1968804518 doi "https://doi.org/10.1016/0923-2494(91)90121-x" @default.
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