A tremendous research on Poly (ADP-ribose) polymerase (PARP) pertaining to cancer and ischemia is in very rapid progress. PARP's are a specific class of enzymes that repairs the damaged DNA. Recent findings suggest also that PARP-1 is the most abundantly expressed nuclear enzyme which involves in various therapeutic areas like inflammation, stroke, cardiac ischemia, cancer and diabetes. The current review describes the overview on clinical candidates of PARP1 and its current status in clinical trials. This paper also covers identification of potent PARP1 inhibitors using structure and ligand based pharmacophore models. Finally 36 potential hits were identified from the virtual screening of pharmacophore models and screened for PARP1 activity. 15 actives were identified as potent PARP1 inhibitors and further optimization of these analogues are in progress.
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http://dx.doi.org/10.2174/1568026614666140929152123 | DOI Listing |
Nat Cancer
January 2025
Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Chan Medical School, Worcester, MA, USA.
Tumors lacking the BRCA1 and BRCA2 (BRCA) hereditary breast cancer genes display heightened sensitivity to anti-cancer treatments, such as inhibitors of poly (ADP-ribose) polymerase 1 (PARP1). However, when resistance develops, treatments are lacking. Using CRISPR technology, we discovered that enhancing homologous recombination through increased DNA end resection in BRCA1-deficient cells by loss of the 53BP1-Shieldin complex-which is associated with resistance to PARP inhibitors-also heightens sensitivity to DNA nicks.
View Article and Find Full Text PDFInt J Hyperthermia
December 2025
Laboratory for Experimental Oncology and Radiobiology (LEXOR), Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
Efficacy of current treatment options for cervical cancer require improvement. Previous studies have shown the enhancing effects of the addition of PARP1-inhibitors to chemoradiotherapy and thermoradiotherapy. The aim of our present study was to test efficacy of different combinations of treatment modalities radiotherapy, cisplatin, hyperthermia and PARP1-inhibitors using tumor models, treated patient samples and tumor models.
View Article and Find Full Text PDFThe human genome contains numerous repetitive nucleotide sequences that display a propensity to fold into non-canonical DNA structures including G-quadruplexes (G4s). G4s have both positive and negative impacts on various aspects of nucleic acid metabolism including DNA replication, DNA repair and RNA transcription. Poly (ADP-ribose) polymerase (PARP1), an important anticancer drug target, has been recently shown to bind a subset of G4s, and to undergo auto-PARylation.
View Article and Find Full Text PDFBreast Cancer Res
January 2025
Department of Medicine (Hematology/Oncology), School of Medicine, University of California San Francisco, 1450 Third St, San Francisco, CA, 94158, USA.
Background: Poly (ADP-Ribose) polymerase inhibitors are approved for treatment of tumors with BRCA1/2 and other homologous recombination repair (HRR) mutations. However, clinical responses are often not durable and treatment may be detrimental in advanced cancer due to excessive toxicities. Thus we are seeking alternative therapeutics to enhance PARP-directed outcomes.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
School of Biological and Food Engineering, Guangxi Science & Technology Normal University, Laibin, Guangxi 546199, China. Electronic address:
Targeting DNA repair mechanisms, particularly PARP-1 inhibition, has emerged as a promising strategy for developing anticancer therapies. we designed and synthesized two 2-thiazolecarboxaldehyde thiosemicarbazone palladium(II) complexes (C1 and C2), and evaluated their anti-cancer activities. These Pd(II) complexes exhibited potent PARP-1 enzyme inhibition and demonstrated considerable antiproliferative activity against various cancer cell lines.
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