Nuclear localization of BCR and cortactin indicates their potential role in regulation of actin branching in nucleus
DOI:
https://doi.org/10.32471/exp-oncology.2312-8852.vol-43-no-1.15811Keywords:
actin branching, Bcr-Abl, chronic myeloid leukemia, cortactin, nuclear integrityAbstract
Summary. Aim: To study cellular localization of full-length breakpoint cluster region (BCR), Pleckstrin homology domain of BCR and cortactin and determine whether they can coexist in cell nucleus. Materials and Methods: HEK293T cell line was transfected with pECFP-BCR, pEGFP-PH and pmTagRFP-N1-CTTN using polyethyleneimine. Live cells were imaged in cell culture dishes with glass coverslip attached to the bottom with Leica SP8 STED 3D confocal microscope in the environmental chamber. Obtained images were processed and analyzed with Fiji software. Results: We identified colocalization of full-length BCR and cortactin in nucleus of cell undergoing terminal phase of cell division. We did not observe nuclear localization of cortactin in non-dividing cell. Both Pleckstrin homology domain and full-length BCR exhibited cytoplasmic as well as nuclear localization. Conclusions: Colocalization of BCR with cortactin in cell nucleus indicates their potential role in regulation of actin network allowing for the maintenance of nuclear architecture and DNA integrity.
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