Abstract:
:Lateral interaction of c-erbB family receptors resulting in dimer formation is the key event initiating signal transduction. Consequently cross-activation and intracellular signaling is triggered with immediate impact on cell proliferation, migration, cell survival, and differentiation. In order to elucidate the connection of signal input (receptor activation) and signal output (altered cellular behavior) we dynamically assessed cell proliferation of BT474 and SK-BR-3 breast cancer cell lines. We quantitated c-erbB2 receptor homodimerization upon treatment with the therapeutic monoclonal anti-c-erbB2 antibodies trastuzumab (Herceptin) and pertuzumab by flow cytometric FRET (FCET) measurements on a cell-by-cell basis and calculated the extent of antibody-induced cell cycle exit. The results confirm that trastuzumab does not decrease c-erbB2 homodimers despite its strong potency to drive c-erbB2-overexpressing cells into quiescence. Pertuzumab, however, is able to prevent c-erbB2 homodimerization and thereby enhance the antiproliferative effect of trastuzumab when administered in combination.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Diermeier-Daucher S,Hasmann M,Brockhoff Gdoi
10.1196/annals.1430.003subject
Has Abstractpub_date
2008-01-01 00:00:00pages
280-6eissn
0077-8923issn
1749-6632pii
1130/1/280journal_volume
1130pub_type
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