What question did this study set out to answer?

This research aims to develop a dual inhibitor targeting PARP1 and ERK pathways to enhance cancer therapy efficacy.

February 28, 2026

Discovery of Novel and Potent Dual PARP1/ERK Inhibitors as a Promising Strategy for Cancer Therapy

Key Points

This research aims to develop a dual inhibitor targeting PARP1 and ERK pathways to enhance cancer therapy efficacy.
Designed a dual PARP1/ERK inhibitor named I-16.
Assessed inhibitor potency using IC50 values for PARP1 and ERK2.
Evaluated antiproliferative activity in various cancer cell lines.
Conducted tumor growth suppression studies in an HCT116 xenograft model.
I-16 demonstrated potent inhibition of PARP1 and ERK2 with IC50 values of 0.9 nM and 1.8 nM, respectively.
I-16 exhibited significant antiproliferative activity across multiple cancer cell lines.
In the xenograft model, I-16 led to significant tumor growth suppression compared to monotherapies with Olaparib and BVD-523.
I-16's efficacy was comparable to the combination therapy of Olaparib and BVD-523.

Abstract

The clinical application of poly(ADP-ribose) polymerase 1 (PARP1) inhibitors is frequently constrained by drug resistance and clinical efficacy. Suppression of the extracellular signal-regulated kinase (ERK) pathway can impair homologous recombination (HR) repair and sensitize cancer cells to PARP1 inhibition. Capitalizing on this synthetic lethal interaction, we designed and developed a novel dual PARP1/ERK inhibitor, I-16, which exhibits potent and selective inhibition against both PARP1 (IC50 = 0.9 nM) and ERK2 (IC50 = 1.8 nM). Remarkably, I-16 displayed strong antiproliferative activity across a panel of cancer cell lines, including both breast cancer susceptibility genes (BRCA) mutant and BRCA-wild-type models. In an HCT116 xenograft model, I-16 (20 mg/kg) elicited significant tumor growth suppression, outperforming Olaparib (50 mg/kg) or BVD-523 (5 mg/kg) monotherapy and achieving efficacy comparable to their combination. These findings suggest that I-16, as the first potent dual PARP1/ERK inhibitor, represents a promising candidate for cancer therapy.

Ask AI

Helpful

Bookmark