Study Identifies SHIP2 Protein as Key Driver of Chemotherapy Resistance in Breast Cancer
Researchers discovered that the SHIP2 protein promotes resistance to fluoropyrimidine chemotherapies by increasing expression of thymidylate synthase (TYMS) in breast cancer cells. The mechanism involves SHIP2 activating SRC and β-catenin signaling, which drives TYMS expression independent of the drug's intended targets. High SHIP2 levels correlate with poor patient outcomes, suggesting it could be a therapeutic target to restore chemotherapy sensitivity.
A new study published on bioRxiv identifies INPPL1 (SHIP2) as a critical regulator of thymidylate synthase expression and fluoropyrimidine resistance in breast cancer. Fluoropyrimidines like 5-fluorouracil are common chemotherapy drugs, but their effectiveness is limited by adaptive resistance mechanisms. The researchers found that SHIP2 enhances TYMS expression at the transcriptional level through a novel mechanism: it increases SRC protein levels and promotes nuclear accumulation of β-catenin, which then drives TYMS expression. Notably, SHIP2 rewires TYMS regulation away from the normal P53-dependent pathway to a β-catenin-driven pathway, allowing cancer cells to maintain TYMS expression even under chemotherapeutic stress. Analysis of patient datasets showed that high INPPL1 expression correlates with elevated TYMS levels and poor clinical outcomes, positioning SHIP2 as a potential therapeutic target to overcome chemotherapy resistance.
Limitations & open questions
The study's limitations and open questions include: whether SHIP2 targeting would be effective in vivo or in clinical settings; whether this mechanism applies to other cancer types beyond breast cancer; the potential off-target effects of SHIP2 inhibition; and whether combination approaches with SRC or β-catenin inhibitors would be necessary for clinical efficacy.
What different sources said
- bioRxivCenter
SHIP2-SRC-β-catenin signaling axis sustains thymidylate synthase expression and promotes fluoropyrimidine resistance.
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