ALK Inhibitors-Induced M Phase Delay Contributes to the Suppression of Cell Proliferation

Area of Science:

• Oncology
• Cell Biology
• Molecular Biology

Background:

• Anaplastic lymphoma kinase (ALK) is implicated in various cancers.
• Targeting ALK with small molecule inhibitors is a cancer treatment strategy, but efficacy varies.
• The precise role of ALK in cell cycle regulation, particularly M phase, requires further elucidation.

Purpose of the Study:

• To investigate the effects of ALK inhibitors on M phase progression in cancer cells.
• To determine if ALK plays a role in regulating cell division.
• To explore the potential of ALK inhibition in cancer therapy by understanding its impact on mitosis.

Main Methods:

• Utilized ALK inhibitors (crizotinib, ceritinib, TAE684) and ALK knockdown in neuroblastoma SH-SY5Y cells.
• Assessed cell proliferation, M phase progression, spindle orientation, chromosome alignment, and ALK autophosphorylation.
• Employed time-lapse imaging to observe anaphase onset and utilized MPS1 inhibitor (AZ3146) and MAD2 knockdown to probe the spindle assembly checkpoint.

Main Results:

• ALK inhibitors and ALK knockdown significantly suppressed cancer cell proliferation and induced M phase delay.
• Observed spindle misorientation, chromosome misalignment, and reduced ALK autophosphorylation at IC50 concentrations.
• Time-lapse imaging showed delayed anaphase onset, and the spindle assembly checkpoint appeared activated upon ALK inhibition.

Conclusions:

• Anaplastic lymphoma kinase (ALK) is crucial for M phase regulation.
• ALK inhibition delays cell cycle progression and may contribute to cancer cell proliferation suppression.
• Targeting ALK could be a viable strategy for treating ALK-expressing cancers by disrupting cell division.