The Use of PARP Inhibitors in Cancer Therapy: Use as Adjuvant with Chemotherapy or Radiotherapy; Use as a Single Agent in Susceptible Patients; Techniques Used to Identify Susceptible Patients

2011 ◽  
pp. 239-266 ◽  
Author(s):  
Sydney Shall ◽  
Terry Gaymes ◽  
Farzin Farzaneh ◽  
Nicola Curtin ◽  
Ghulam J. Mufti
Keyword(s):  
Cancer Therapy ◽  
Single Agent ◽  
Parp Inhibitors

scholarly journals Bioinformatic Analysis of the Nicotinamide Binding Site in Poly(ADP-Ribose) Polymerase Family Proteins

Cancers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1201
Author(s):  
Garri Manasaryan ◽  
Dmitry Suplatov ◽  
Sergey Pushkarev ◽  
Viktor Drobot ◽  
Alexander Kuimov ◽  
...  
Keyword(s):  
Molecular Modeling ◽  
Cancer Therapy ◽  
Adverse Effects ◽  
Binding Site ◽  
Cancer Cells ◽  
Anticancer Drugs ◽  
Bioinformatic Analysis ◽  
Parp Inhibitors ◽  
Functional Region ◽  
D Loop

The PARP family consists of 17 members with diverse functions, including those related to cancer cells’ viability. Several PARP inhibitors are of great interest as innovative anticancer drugs, but they have low selectivity towards distinct PARP family members and exert serious adverse effects. We describe a family-wide study of the nicotinamide (NA) binding site, an important functional region in the PARP structure, using comparative bioinformatic analysis and molecular modeling. Mutations in the NA site and D-loop mobility around the NA site were identified as factors that can guide the design of selective PARP inhibitors. Our findings are of particular importance for the development of novel tankyrase (PARPs 5a and 5b) inhibitors for cancer therapy.

scholarly journals Successes and Challenges of PARP Inhibitors in Cancer Therapy

2015 ◽  
Vol 5 ◽  
Author(s):  
Tiffany K. Ricks ◽  
Haw-Jyh Chiu ◽  
Gwynn Ison ◽  
Geoffrey Kim ◽  
Amy E. McKee ◽  
...  
Keyword(s):  
Cancer Therapy ◽  
Parp Inhibitors ◽  
Successes And Challenges

scholarly journals PARP Inhibitors for Cancer Therapy

Cell ◽  
2017 ◽  
Vol 169 (2) ◽  
pp. 183 ◽  
Author(s):  
Ken Y. Lin ◽  
W. Lee Kraus
Keyword(s):  
Cancer Therapy ◽  
Parp Inhibitors

scholarly journals A Review on DNA Repair Inhibition by PARP Inhibitors in Cancer Therapy

Folia Medica ◽  
2018 ◽  
Vol 60 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Ashish P. Shah ◽  
Chhagan N. Patel ◽  
Dipen K. Sureja ◽  
Kirtan P. Sanghavi
Keyword(s):  
Dna Damage ◽  
Dna Repair ◽  
Cancer Therapy ◽  
Repair Process ◽  
Parp Inhibitors ◽  
Brca Mutations ◽  
Development Of Resistance ◽  
Damage Repair ◽  
Future Therapy

AbstractThe DNA repair process protects the cells from DNA damaging agent by multiple pathways. Majority of the cancer therapy cause DNA damage which leads to apoptosis. The cell has natural ability to repair this damage which ultimately leads to development of resistance of drugs. The key enzymes involved in DNA repair process are poly(ADP-ribose) (PAR) and poly(ADP-ribose) polymerases (PARP). Tumor cells repair their defective gene via defective homologues recombination (HR) in the presence of enzyme PARP. PARP inhibitors inhibit the enzyme poly(ADP-ribose) polymerases (PARPs) which lead to apoptosis of cancer cells. Current clinical data shows the role of PARP inhibitors is not restricted to BRCA mutations but also effective in HR dysfunctions related tumors. Therefore, investigation in this area could be very helpful for future therapy of cancer. This review gives detail information on the role of PARP in DNA damage repair, the role of PARP inhibitors and chemistry of currently available PARP inhibitors.

scholarly journals TIP60 K430 SUMOylation attenuates its interaction with DNA-PKcs in S-phase cells: Facilitating homologous recombination and emerging target for cancer therapy

2020 ◽  
Vol 6 (28) ◽  
pp. eaba7822 ◽  
Author(s):  
Shan-Shan Gao ◽  
Hua Guan ◽  
Shuang Yan ◽  
Sai Hu ◽  
Man Song ◽  
...  
Keyword(s):  
Cancer Therapy ◽  
Homologous Recombination ◽  
Cellular Response ◽  
Parp Inhibitors ◽  
S Phase ◽  
Tumor Growth Inhibition ◽  
Dna Double Strand Breaks ◽  
End Joining ◽  
Pathway Activation ◽  
Pathway Choice

Nonhomologous end joining (NHEJ) and homologous recombination (HR) are major repair pathways of DNA double-strand breaks (DSBs). The pathway choice of HR and NHEJ is tightly regulated in cellular response to DNA damage. Here, we demonstrate that the interaction of TIP60 with DNA-PKcs is attenuated specifically in S phase, which facilitates HR pathway activation. SUMO2 modification of TIP60 K430 mediated by PISA4 E3 ligase blocks its interaction with DNA-PKcs, whereas TIP60 K430R mutation recovers its interaction with DNA-PKcs, which results in abnormally increased phosphorylation of DNA-PKcs S2056 in S phase and marked inhibition of HR efficiency, but barely affects NHEJ activity. TIP60 K430R mutant cancer cells are more sensitive to radiation and PARP inhibitors in cancer cell killing and tumor growth inhibition. Collectively, coordinated regulation of TIP60 and DNA-PKcs facilitates HR pathway choice in S-phase cells. TIP60 K430R mutant is a potential target of radiation and PARPi cancer therapy.

Risk of gastrointestinal and hepatic toxicities in patients with cancer treated with poly adenosine diphosphate ribose polymerase inhibitors: A meta-analysis of seven phase III trials.

2018 ◽  
Vol 36 (34_suppl) ◽  
pp. 219-219
Author(s):  
Myo Zaw ◽  
Anita Sultan ◽  
Sriman Swarup ◽  
Myat M. Han ◽  
Yin Mon Myat ◽  
...  
Keyword(s):  
Side Effects ◽  
Synthetic Lethality ◽  
Meta Analysis ◽  
Single Agent ◽  
Adenosine Diphosphate ◽  
Parp Inhibitors ◽  
Phase Iii ◽  
Control Group ◽  
Patients With Cancer ◽  
Phase Iii Trials

219 Background: Inhibition of poly adenosine diphosphate ribose polymerase (PARP) enzymes terminates an alternative DNA repair pathway, resulting in synthetic lethality in homologous recombination deficient tumors. Many PARP inhibitors have shown to improve survival in many solid tumors with noteworthy safety concerns. We undertook a systematic review and meta-analysis of randomized controlled trials (RCT) to determine the risk of gastrointestinal (GI) and hepatic toxicities. Methods: We conducted a comprehensive literature search using MEDLINE, EMBASE databases and meeting abstracts from inception through June 2018. Phase III RCTs that mention GI toxicities and elevation of aspartate aminotransferase (AST) or alanine aminotransferase (ALT) as adverse effects were incorporated in the analysis. Mantel-Haenszel (MH) method was used to calculate the estimated pooled risk ratio (RR) with 95% confidence interval (CI). Random effects model was applied. Results: 3188 patients from 7 phase III RCTs with breast, ovarian and gastric cancer were eligible. Studies compared olaparib or niraparib or rucaparib versus placebo, olaparib versus single agent chemotherapy, iniparib + gemcitabine / carboplatin (GC) versus GC, veliparib + C versus C and olaparib + paclitaxel versus paclitaxel. The RR of all-grade side effects were as follows: diarrhea, 1.24 (95% CI: 1.08 – 1.42, P = 0.002); nausea, 1.53 (95% CI: 1.16 – 2.02, P = 0.002); vomiting, 1.46 (95% CI: 1.02 – 2.08, P = 0.03); elevated AST, 1.25 (95% CI: 0.58 – 2.67, P = 0.55); and elevated ALT, 1.61 (95% CI: 0.81 – 3.20, P = 0.16). The RR of high-grade side effects were as follows: diarrhea, 1.08 (95% CI: 0.52 – 2.24, P = 0.82); nausea, 1.81 (95% CI: 0.79 – 4.12, P = 0.15); vomiting, 1.99 (95% CI: 1.06 – 3.73, P = 0.03); elevated AST, 1.86 (95% CI: 0.45 – 7.55, P = 0.38); and elevated ALT, 1.33 (95% CI: 0.42 – 4.18, P = 0.62). Conclusions: Our study showed that the risk of developing all grades of vomiting as well as any-grade nausea and diarrhea was high in PARP inhibitors arm, compared to control group. Timely recognition and prompt intervention with good supportive care are entailed.

EGFR amplification predicted selective sensitivity to PARP inhibitors with high PARP-DNA trapping potential in human GBM.

2019 ◽  
Vol 37 (15_suppl) ◽  
pp. 2047-2047
Author(s):  
W. K. Alfred Yung ◽  
Shaofang Wu ◽  
Feng Gao ◽  
Siyuan Zheng ◽  
Jie Ding ◽  
...  
Keyword(s):  
Stem Cells ◽  
Dna Damage ◽  
Parp Inhibitor ◽  
Single Agent ◽  
Parp Inhibitors ◽  
Glioma Stem Cells ◽  
Egfr Amplification ◽  
Damage Repair ◽  
Selective Sensitivity ◽  
Dna Trapping

2047 Background: Poly-ADP-ribose polymerase (PARP) is an enzyme critical for regulating a variety of DNA damage repair mechanisms such as BER/SSBR, and PARP inhibitors have been shown to have single agent activity in breast and ovarian cancer patients with BRCA ½ mutations. However, PARP inhibitor such as veliparib has limited single agent activity in GBM and identifying markers predicting sensitivity is critical to select individuals or certain groups of patients for PARP inhibitor therapy. Methods: Potency and selectivity of PARP inhibitors were analyzed in a panel of glioma stem cells (GSCs) with varying genetic background. In vivo anti-tumor activity was evaluated in xenograft models. Results: In this study, we report that PARP inhibitor, talazoparib, showed strong single-agent cytotoxicity and remarkable selective activity in glioma stem cells (GSCs). This single agent activity was strongly correlated with EGFR amplification. GSCs with EGFR amplification (which occurs in about 45% of GBMs) showed higher oxidative base damage, DNA breaks, and genomic instability than non-amplified GSCs. To sustain the elevated basal oxidative stress, EGFR-amplified GSCs had increased basal expression of DNA repair proteins. As a result of blocked DNA damage repair by talazoparib treatment, DNA damage accumulated and lead to increased PARP-DNA complexes, which was then trapped by talazoparib and resulted in high toxicity. The PARP-DNA trapping function of PARPi is essential as olaparib and veliparib, two PARP inhibitors with weak DNA-PARP trapping potential did not show sensitivity in GSCs. In contrast, Pamiparib, another PARP inhibitor with similar PARP-DNA trapping ability to that of talazoparib, showed selective sensitivity in EGFR-amplified GSC. Conclusions: Our data showed that EGFR amplified GSCs with higher basal DNA damage exhibited therapeutic vulnerability to PARP inhibitors with high PARP-DNA trapping ability, and that EGFR amplification is a potential selection or predictive biomarker for PARP inhibitor therapy in GBM.

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