# Changes in spindle morphology driven by TPX2 overexpression in MYC-driven breast cancer cells

## TL;DR

The paper shows that high levels of TPX2 in MYC-driven breast cancer cells lead to shorter spindles and altered spindle structure during cell division.

## Contribution

The study reveals how TPX2 overexpression specifically affects spindle morphology in MYC-driven cancer cells.

## Key findings

- Breast cancer cells with high MYC and TPX2 have shorter spindles and increased TPX2 at spindle poles.
- Non-transformed RPE-1 cells showed similar spindle changes compared to MYC-overexpressing HeLa cells.
- TPX2 may help cancer cells divide despite mitotic stress caused by MYC.

## Abstract

The
MYC
oncogene was previously shown to induce mitotic spindle defects, chromosome instability, and reliance on the microtubule-associated protein
TPX2
to survive, but how
TPX2
levels affect spindle morphology in cancer cells has not previously been examined in detail. We show that breast cancer cell lines expressing high levels of
MYC
and
TPX2
possess shorter spindles with increased
TPX2
localization at spindle poles. A similar effect was observed in non-transformed human RPE-1 cells compared to a tumor cell line (HeLa) that overexpresses
MYC
. These results demonstrate that
TPX2
alters spindle length and morphology in cancer cells, which may contribute their ability to divide despite MYC-induced mitotic stress.