Chromosomal instability-induced cell invasion through caspase-driven DNA damage

Area of Science:

• Cell Biology
• Genetics
• Cancer Research

Background:

• Chromosomal instability (CIN) is linked to increased metastasis in human carcinomas.
• The mechanisms driving CIN-induced invasiveness are not fully understood.

Purpose of the Study:

• To investigate the role of DNA damage and specific molecular pathways in CIN-induced cancer invasiveness using a Drosophila model.
• To identify novel therapeutic targets for metastasis.

Main Methods:

• Utilized a Drosophila epithelial model to study CIN.
• Analyzed DNA damage, caspase activity, and JAK/STAT signaling.
• Investigated the role of the cytokine Upd3 in an autocrine feedback loop.

Main Results:

• CIN-induced DNA damage, from lagging chromosomes and replicative stress, promotes invasiveness.
• Effector caspases have a sub-lethal role in enhancing CIN-induced DNA damage.
• The JAK/STAT pathway activates apoptotic caspases via pro-apoptotic gene induction.
• An Upd3-mediated autocrine loop amplifies apoptotic signaling in migrating cells, enhancing invasiveness.

Conclusions:

• CIN promotes metastasis through chromosome segregation errors and subsequent DNA damage.
• Effector caspases and the JAK/STAT pathway, amplified by Upd3, are key mediators of CIN-induced invasiveness.
• These findings highlight chromosome-signature-independent effects of CIN in metastasis.