Proteasome inhibition and ROS generation by 4-nerolidylcatechol induces melanoma cell death
Carla A Brohem1, Renato R Massaro, Manoela Tiago
1Department of Clinical Chemistry & Toxicology, School of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil.
Abstract:
Induction of apoptotic cell death in response to chemotherapy and other external stimuli has proved extremely difficult in melanoma, leading to tumor progression, metastasis formation and resistance to therapy. A promising approach for cancer chemotherapy is the inhibition of proteasomal activity, as the half-life of the majority of cellular proteins is under proteasomal control and inhibitors have been shown to induce cell death programs in a wide variety of tumor cell types. 4-Nerolidylcatechol (4-NC) is a potent antioxidant whose cytotoxic potential has already been demonstrated in melanoma tumor cell lines. Furthermore, 4-NC was able to induce the accumulation of ubiquitinated proteins, including classic targets of this process such as Mcl-1. As shown for other proteasomal inhibitors in melanoma, the cytotoxic action of 4-NC is time-dependent upon the pro-apoptotic protein Noxa, which is able to bind and neutralize Mcl-1. We demonstrate the role of 4-NC as a potent inducer of ROS and p53. The use of an artificial skin model containing melanoma also provided evidence that 4-NC prevented melanoma proliferation in a 3D model that more closely resembles normal human skin.
Insights
4-Nerolidylcatechol (4-NC) effectively combats melanoma by inhibiting proteasomal activity, inducing cancer cell death. This antioxidant prevents melanoma proliferation in advanced skin models, offering a promising therapeutic avenue.
Area of Science:
- Oncology
- Biochemistry
- Dermatology
Background:
- Melanoma exhibits resistance to apoptosis, hindering chemotherapy effectiveness and promoting metastasis.
- Proteasomal activity inhibition is a promising cancer chemotherapy strategy, inducing cell death in various tumor types.
- 4-Nerolidylcatechol (4-NC), a potent antioxidant, has demonstrated cytotoxic effects in melanoma cell lines.
Purpose of the Study:
- To investigate the mechanism of 4-NC's cytotoxic action in melanoma.
- To evaluate 4-NC's potential as a melanoma therapeutic agent.
- To assess 4-NC's effect on melanoma proliferation in a 3D skin model.
Main Methods:
- Assessing 4-NC's impact on proteasomal activity and protein ubiquitination.
- Analyzing the time-dependent role of the pro-apoptotic protein Noxa in 4-NC's cytotoxic mechanism.
- Measuring reactive oxygen species (ROS) and p53 induction by 4-NC.
- Evaluating 4-NC's anti-proliferative effects in a 3D artificial skin melanoma model.
Main Results:
- 4-NC induced accumulation of ubiquitinated proteins, including Mcl-1, and demonstrated time-dependent upregulation of Noxa.
- 4-NC was identified as a potent inducer of ROS and p53.
- 4-NC effectively prevented melanoma proliferation in a 3D artificial skin model, mimicking human skin.
Conclusions:
- 4-NC exhibits potent anti-melanoma activity through proteasomal inhibition and induction of apoptosis.
- The findings highlight 4-NC's potential as a novel therapeutic agent for melanoma treatment.
- 4-NC's efficacy in a 3D skin model suggests its potential for clinical application in melanoma therapy.
