Editorial: Advances in wild type and mutant p53 research in cancer
Olga N. Hernández-de la Cruz
Guadalupe Domínguez-Gómez
Moonmoon Deb3 
José Díaz-Chávez- 1Posgrado en Ciencias Genómicas, Universidad Autónoma de la Ciudad de México, México City, Mexico
- 2Subdirección de Investigación Clínica, Instituto Nacional de Cancerología, México City, Mexico
- 3Wellcome Trust Centre for Cell Biology, Edinburgh, United Kingdom
- 4Unidad de Investigación Biomédica en Cáncer, Instituto de Investigaciones Biomédicas, UNAM/Instituto Nacional de Cancerología (INCan), México City, Mexico
Editorial on the Research Topic
Advances in wild type and mutant p53 research in cancer
Four decades ago, the p53 protein was discovered (Chang et al., 1979; Lane and Crawford, 1979; Linzer and Levine, 1979), and due to its multiple functions, it has become one of the most studied transcriptional factors in humans. However, we still have an incomplete view of the molecular mechanisms regulated by p53 in normal and tumor cells. Because it is a crucial component in maintaining genomic integrity, was called “the guardian of the genome” (Lane, 1992). Even more, p53 transactivates multiple genes and joins different cellular partners, to coordinate vital cellular processes, such as cell cycle, metabolism, proliferation, cell death, and aging, among others.
The gene of p53 (TP53) is susceptible to multiple mutations, losing its suppressor tumor function but acquiring oncogenic activities called “gain of function” (GOF). Other mechanisms contributing to the structural and functional diversity of p53 include the use of alternative promoters, alternative splicing (Chen et al., 2021), and multiple post-translational modifications (PTMs) (Bode and Dong, 2004). The expression of different p53 variants in cells has significant biological and clinical implications in cancer (Rivlin et al., 2011; Alvarado-Ortiz et al., 2021).
This Research Topic on Advances in wild type and mutant p53 research in cancer is a Research Topic of seven articles, including two original research and five review articles, written by 39 researchers from around the world interested in unraveling the relationship between p53 and its variants in the development of cancer.
For example, under normal and stress conditions, p53 needs a precise combination of multiple PTMs to coordinate their biological functions (Liu et al., 2019; Chen et al., 2020; Zhang et al., 2022). However, the specific role of these modifications and the signaling pathways they trigger are not fully understood (Meek and Anderson, 2009). In this Research Topic, Marques et al. describe the importance of PMTs in determining the three-dimensional structure, stability, activity, and function of p53, as well as, its impact on tumor progression. In addition, PMTs can stimulate the multimerization of p53 and its mutants, forming structures known as “higher-order structures” (HOS), some of which are linked to cancer development. However, many open questions remain about their organization and function. In this context, the authors describe structural analysis methods that could help us understand the high-resolution supramolecular organization of p53 and unravel the dynamic behavior between p53 and cellular partners.
Another exciting focus is described by Ha et al. These authors detail how the structural stability of p53 strongly depends on the availability of zinc. At low zinc concentrations, p53 shows greater structural instability and lower affinity for its target promoters, thus reducing its transactivating capacity. However, some p53 mutants have a lower affinity for zinc and decreased recognition of their target sequences. Hence, a higher concentration of this metal in the medium is necessary to maintain its functional three-dimensional structure. From this perspective, the correct folding of p53 mutants in tumors could be favored by the use of metallochaperones (zinc ionophores), which could increase the permeability of tumor cells by zinc and maintain cellular homeostasis.
It has also been described that p53 regulates the expression of genes involved in the epithelial-mesenchymal transition (EMT) (Parfenyev et al., 2021; Semenov et al.). EMT is a process that stimulates phenotypic plasticity and tumor development. During EMT, cells acquire a greater capacity for invasion, extravasation, and migration, thus favoring metastasis. In this way, Semenov et al. describe the cell signaling pathways that trigger EMT, as well as, the coordinated participation of p53 with other cellular partners and miRNAs in the regulation of this process, and the impact of p53 mutants of the GOF class in the deregulation of this mechanism.
In addition, p53 participates in another poorly studied mechanism of tumor suppression: ferroptosis. Ferroptosis is a type of non-apoptotic cell death discovered in 2012; it depends on high concentrations of iron in the intracellular environment and is triggered after lipid peroxidation and an increase in the concentrations of reactive oxygen species (Kang et al., 2019; Mou et al., 2019; Liu et al., 2020; Wang et al., 2020). Babamohamadi et al. carried out an updated review on the role of p53 in ferroptosis regulation and highlighted the importance of this knowledge in the development of anticancer therapies. Further, the authors describe some p53 mutants with conformational alterations and a tendency to form intracellular aggregates, which could be related to cancer development. Moreover, they describe different types of previously reported molecules (peptides, some arginine analogs, and acetylcholine chloride) that could serve to inhibit the accumulation of these p53 mutants in tumors.
Another aspect of p53 regulation is its proteasomal degradation; in normal cells, p53 expression is negatively regulated by the E3 ubiquitin ligase MDM2 protein and its homolog MDM4 (Klein et al., 2021; Nagpal and Yuan, 2021; Pan and Blattner, 2021). The interaction of MDM2 and MDM4 with p53 masks the N-terminal region of p53, thus blocking its ability to interact with chromatin. Furthermore, MDM2, but not MDM4, promotes p53 degradation via the proteasome; however, in response to cellular stress, MDM2 is inactivated, decreasing its physical interaction with p53. From this perspective, some compounds blocking the interaction between p53/MDM2 and p53/MDMX complexes (such as RITA and PpIX) have been developed to restore the tumor suppressor activity of p53 and induce regression of highly malignant lesions (Jiang et al., 2019; de Bakker et al., 2022). Grinkevich et al. describe for the first time the molecular mechanism of p53 reactivation mediated by RITA and PpIX. These authors find that RITA and PpIX bind to the highly unstructured N-terminal region of p53 and induce allosteric changes that disrupt p53/MDM2 and p53/MDM4 complexes, thereby increasing the stability and function of p53. On the other hand, during Human Papilloma Virus (HPV) infections, the viral oncoprotein E6 can interact with p53 and stimulate its degradation via the proteasome. In this way, the virus blocks cell death and promotes its replication, eventually triggering the malignant transformation of cells (Idres et al., 2022). Interestingly, it has been reported that Human Immunodeficiency Virus Protease Inhibitors (HIV-PIs), could potentially interfere with E6-mediated proteasomal degradation of p53, thus stimulating the cell cycle arrest and apoptosis of tumor cells. In this sense, Makgoo et al. described some mechanisms of p53 restoration in HPV-positive cervical cancer. For example, using compounds that reduce E6 levels or disturb p53-E6 interactions.
Currently, there is an increase in morbidity and mortality due to different types of cancer, so the search for new therapeutic alternatives has been a primary task in recent decades. In this sense, medicinal plants constitute a biological source of hundreds of molecules with therapeutic capacities for cancer treatment (Carlos-Reyes et al., 2019; Shoaib et al., 2022). For example, Laka and Mbita reported the antitumor effects of extracts from Drimia calcarata, a plant widely distributed in Africa, in different human lung cancer cell lines with different Tp53 gene mutation statuses. Likewise, they analyzed the expression of genes involved in the cell cycle and apoptosis during treatment with the extracts to unravel the molecular mechanisms induced by the extracts. These studies make it possible to provide therapeutic alternatives for people who do not have access to anticancer drugs or who traditionally use natural products derived from plants to treat their diseases.
After more than 40 years of intense research, p53 continues to surprise us. In the years to come, we hope that p53 will continue to be one of our allies in the battle against cancer. This Research Topic allowed us to compile the most outstanding scientific advances in the study of the structure and function of p53 and its mutants in recent years and to describe new roles of p53 mutants in tumor initiation and progression. Likewise, we broadened the biological knowledge of p53 and its mutants, which will allow us to diversify our therapeutic strategies against cancer in the future.
Author contributions
All authors listed have made a substantial, direct, and intellectual contribution to the research topic and approved it for publication.
Acknowledgments
We are grateful to all the authors and reviewers of this Frontiers Research Topic for their excellent contribution. We also thank the editorial team at Frontiers for their invaluable support.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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References
Alvarado-Ortiz, E., de la Cruz-López, K. G., Becerril-Rico, J., Sarabia-Sánchez, M. A., Ortiz-Sánchez, E., and García-Carrancá, A. (2021). Mutant p53 gain-of-function: Role in cancer development, progression, and therapeutic approaches. Front. Cell. Dev. Biol. 8, 607670. doi:10.3389/fcell.2020.607670
Bode, A. M., and Dong, Z. (2004). Post-translational modification of p53 in tumorigenesis. Nat. Rev. Cancer 4 (10), 793–805. doi:10.1038/nrc1455
Carlos-Reyes, Á., López-González, J. S., Meneses-Flores, M., Gallardo-Rincón, D., Ruíz-García, E., and Marchat, L. A., (2019). Dietary compounds as epigenetic modulating agents in cancer. Front. Genet. 10, 79. doi:10.3389/fgene.2019.00079
Chang, C., Simmons, D. T., Martin, M. A., and Mora, P. T. (1979). Identification and partial characterization of new antigens from simian virus 40-transformed mouse cells. J. Virol. 31 (2), 463–471. doi:10.1128/JVI.31.2.463-471.1979
Chen, J., Zhang, D., Qin, X., Owzar, K., McCann, J. J., and Kastan, M. B. (2021). DNA-Damage-Induced alternative splicing of p53. Cancers 13 (2), 251. doi:10.3390/cancers13020251
Chen, L., Liu, S., and Tao, Y. (2020). Regulating tumor suppressor genes: Post-translational modifications. Signal Transduct. Target. Ther. 5 (1), 90. doi:10.1038/s41392-020-0196-9
de Bakker, T., Journe, F., Descamps, G., Saussez, S., Dragan, T., and Ghanem, G., (2022). Restoring p53 function in head and neck squamous cell carcinoma to improve treatments. Front. Oncol. 11, 799993. doi:10.3389/fonc.2021.799993
Idres, Y. M., McMillan, N., and Idris, A. (2022). Hyperactivating p53 in human papillomavirus-driven cancers: A potential therapeutic intervention. Mol. Diagn. Ther. 26 (3), 301–308. doi:10.1007/s40291-022-00583-5
Jiang, L., Malik, N., Acedo, P., and Zawacka-Pankau, J. (2019). Protoporphyrin IX is a dual inhibitor of p53/MDM2 and p53/MDM4 interactions and induces apoptosis in B-cell chronic lymphocytic leukemia cells. Cell. Death Discov. 5, 77. doi:10.1038/s41420-019-0157-7
Kang, R., Kroemer, G., and Tang, D. (2019). The tumor suppressor protein p53 and the ferroptosis network. Free Radic. Biol. Med. 133, 162–168. doi:10.1016/j.freeradbiomed.2018.05.074
Klein, A. M., de Queiroz, R. M., Venkatesh, D., and Prives, C. (2021). The roles and regulation of MDM2 and MDMX: It is not just about p53. Genes. Dev. 35 (9-10), 575–601. doi:10.1101/gad.347872.120
Lane, D. P., and Crawford, L. V. (1979). T antigen is bound to a host protein in SV40-transformed cells. Nature 278 (5701), 261–263. doi:10.1038/278261a0
Linzer, D. I., and Levine, A. J. (1979). Characterization of a 54K Dalton cellular SV40 tumor antigen present in SV40-transformed cells and uninfected embryonal carcinoma cells. Cell. 17 (1), 43–52. doi:10.1016/0092-8674(79)90293-9
Liu, J., Zhang, C., Wang, J., Hu, W., and Feng, Z. (2020). The regulation of ferroptosis by tumor suppressor p53 and its pathway. Int. J. Mol. Sci. 21 (21), 8387. doi:10.3390/ijms21218387
Liu, Y., Tavana, O., and Gu, W. (2019). P53 modifications: Exquisite decorations of the powerful guardian. J. Mol. Cell. Biol. 11 (7), 564–577. doi:10.1093/jmcb/mjz060
Meek, D. W., and Anderson, C. W. (2009). Posttranslational modification of p53: Cooperative integrators of function. Cold Spring Harb. Perspect. Biol. 1 (6), a000950. doi:10.1101/cshperspect.a000950
Mou, Y., Wang, J., Wu, J., He, D., Zhang, C., and Duan, C., (2019). Ferroptosis, a new form of cell death: Opportunities and challenges in cancer. J. Hematol. Oncol. 12 (1), 34. doi:10.1186/s13045-019-0720-y
Nagpal, I., and Yuan, Z. M. (2021). The basally expressed p53-mediated homeostatic function. Front. Cell. Dev. Biol. 9, 775312. doi:10.3389/fcell.2021.775312
Pan, M., and Blattner, C. (2021). Regulation of p53 by E3s. Cancers 13 (4), 745. doi:10.3390/cancers13040745
Parfenyev, S., Singh, A., Fedorova, O., Daks, A., Kulshreshtha, R., and Barlev, N. A. (2021). Interplay between p53 and non-coding RNAs in the regulation of EMT in breast cancer. Cell. Death Dis. 12 (1), 17. doi:10.1038/s41419-020-03327-7
Rivlin, N., Brosh, R., Oren, M., and Rotter, V. (2011). Mutations in the p53 tumor suppressor gene: Important milestones at the various steps of tumorigenesis. Genes. Cancer 2 (4), 466–474. doi:10.1177/1947601911408889
Shoaib, S., Islam, N., and Yusuf, N. (2022). Phytocompounds from the medicinal and dietary plants: Multi-target agents for cervical cancer prevention and therapy. Curr. Med. Chem. 29 (26), 4481–4506. doi:10.2174/0929867329666220301114251
Wang, Y., Wei, Z., Pan, K., Li, J., and Chen, Q. (2020). The function and mechanism of ferroptosis in cancer. Apoptosis 25 (11-12), 786–798. doi:10.1007/s10495-020-01638-w
Keywords: p53, gain of function (GOF), cancer, ferroptosis, zinc ionophores, p53 reactivation therapy, Drimia calcarata
Citation: Hernández-de la Cruz ON, Domínguez-Gómez G, Deb M and Díaz-Chávez J (2022) Editorial: Advances in wild type and mutant p53 research in cancer. Front. Mol. Biosci. 9:1064280. doi: 10.3389/fmolb.2022.1064280
Received: 08 October 2022; Accepted: 31 October 2022;
Published: 10 November 2022.
Edited and reviewed by:
Cecilia Giulivi, University of California, Davis, United StatesCopyright © 2022 Hernández-de la Cruz, Domínguez-Gómez, Deb and Díaz-Chávez. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: José Díaz-Chávez, jdiazchavez03@gmail.com