1
|
Shin BJ, Kim BJ, Paeng EJ, Rifkin JT, Moon SH, Shin SH, Ryu BY. N-Acetyl-L-cysteine attenuates titanium dioxide nanoparticle (TiO 2 NP)-induced autophagy in male germ cells. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2024; 108:104466. [PMID: 38759847 DOI: 10.1016/j.etap.2024.104466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 04/11/2024] [Accepted: 05/10/2024] [Indexed: 05/19/2024]
Abstract
Titanium dioxide nanoparticles (TiO2 NPs) are widely used in consumer products, raising concerns about their impact on human health. This study investigates the effects of TiO2 NPs on male germ cells while focusing on cell proliferation inhibition and underlying mechanisms. This was done by utilizing mouse GC-1 spermatogonia cells, an immortalized spermatogonia cell line. TiO2 NPs induced a concentration-dependent proliferation inhibition with increased reactive oxygen species (ROS) generation. Notably, TiO2 NPs induced autophagy and decreased ERK phosphorylation. Treatment with the ROS inhibitor N-Acetyl-l-cysteine (NAC) alleviated TiO2 NPs-induced autophagy, restored ERK phosphorylation, and promoted cell proliferation. These findings call attention to the reproductive risks posed by TiO2 NPs while also highlighting NAC as a possible protective agent against reproductive toxins.
Collapse
Affiliation(s)
- Beom-Jin Shin
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Gyeonggi-Do 17546, Republic of Korea
| | - Bang-Jin Kim
- Department of Surgery, Division of Surgical Sciences, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Eun-Ji Paeng
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Gyeonggi-Do 17546, Republic of Korea
| | - Jack Tyler Rifkin
- Department of Surgery, Division of Surgical Sciences, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Sung-Hwan Moon
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Gyeonggi-Do 17546, Republic of Korea
| | - Seung Hee Shin
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Gyeonggi-Do 17546, Republic of Korea
| | - Buom-Yong Ryu
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Gyeonggi-Do 17546, Republic of Korea.
| |
Collapse
|
2
|
Mirabdali S, Ghafouri K, Farahmand Y, Gholizadeh N, Yazdani O, Esbati R, Hajiagha BS, Rahimi A. The role and function of autophagy through signaling and pathogenetic pathways and lncRNAs in ovarian cancer. Pathol Res Pract 2024; 253:154899. [PMID: 38061269 DOI: 10.1016/j.prp.2023.154899] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 10/16/2023] [Accepted: 10/18/2023] [Indexed: 01/24/2024]
Abstract
Lysosomal-driven autophagy is a tightly controlled cellular catabolic process that breaks down and recycles broken or superfluous cell parts. It is involved in several illnesses, including cancer, and is essential in preserving cellular homeostasis. Autophagy prevents DNA mutation and cancer development by actively eliminating pro-oxidative mitochondria and protein aggregates from healthy cells. Oncosuppressor and oncogene gene mutations cause dysregulation of autophagy. Increased autophagy may offer cancer cells a pro-survival advantage when oxygen and nutrients are scarce and resistance to chemotherapy and radiation. This finding justifies the use of autophagy inhibitors in addition to anti-neoplastic treatments. Excessive autophagy levels can potentially kill cells. The diagnosis and treatment of ovarian cancer present many difficulties due to its complexity and heterogeneity. Understanding the role of autophagy, a cellular process involved in the breakdown and recycling of cellular components, in ovarian cancer has garnered increasing attention in recent years. Of particular note is the increasing amount of data indicating a close relationship between autophagy and ovarian cancer. Autophagy either promotes or restricts tumor growth in ovarian cancer. Dysregulation of autophagy signaling pathways in ovarian cancers can affect the development, metastasis, and response to tumor treatment. The precise mechanism underlying autophagy concerning ovarian cancer remains unclear, as does the role autophagy plays in ovarian carcinoma. In this review, we tried to encapsulate and evaluate current findings in investigating autophagy in ovarian cancer.
Collapse
Affiliation(s)
- Seyedsaber Mirabdali
- Regenerative Medicine Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Kimia Ghafouri
- School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Yalda Farahmand
- School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Nasim Gholizadeh
- Department of Dermatology, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Omid Yazdani
- Department of Medicine, Shahid Beheshti University, Tehran, Iran
| | - Romina Esbati
- Department of Medicine, Shahid Beheshti University, Tehran, Iran
| | - Bahareh Salmanian Hajiagha
- Department of Cellular and Molecular Biology, Faculty of Basic Science, Tehran East Branch, Islamic Azad University, Tehran, Iran.
| | - Asiye Rahimi
- Faculty of Nursing and Midwifery, Mashhad University of Medical Sciences, Mashhad, Iran.
| |
Collapse
|
3
|
Nurzadeh M, Ghalandarpoor-Attar SM, Ghalandarpoor-Attar SN, Rabiei M. The sequestosome 1 protein: therapeutic vulnerabilities in ovarian cancer. Clin Transl Oncol 2023; 25:2783-2792. [PMID: 36964889 DOI: 10.1007/s12094-023-03148-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Accepted: 03/04/2023] [Indexed: 03/26/2023]
Abstract
Ovarian cancer (OC) is the most deadly tumor that may develop in a woman's reproductive system. It is also one of the most common causes of death among those who have been diagnosed with cancer in women. An adapter protein known as sequestosome 1(SQSTM1) or p62 is primarily responsible for the transportation, degradation, and destruction of a wide variety of proteins. This adapter protein works in conjunction with the autophagy process as well as the ubiquitin proteasome degradation pathway. In addition, the ability of SQSTM1 to interact with multiple binding partners link SQSTM1 to various pathways in the context of antioxidant defense system and inflammation. In this review, we outline the processes underlying the control that SQSTM1 has on these pathways and how their dysregulation contributes to the development of OC. At the final, the therapeutic approaches based on SQSTM1 targeting have been discussed.
Collapse
Affiliation(s)
- Maryam Nurzadeh
- Fetomaternal Department, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | | | | | - Maryam Rabiei
- Obstetrics and Gynecology Department, Tehran University of Medical Sciences, Tehran, Iran.
| |
Collapse
|
4
|
Orlandi G, Roncucci L, Carnevale G, Sena P. Different Roles of Apoptosis and Autophagy in the Development of Human Colorectal Cancer. Int J Mol Sci 2023; 24:10201. [PMID: 37373349 DOI: 10.3390/ijms241210201] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/12/2023] [Accepted: 06/14/2023] [Indexed: 06/29/2023] Open
Abstract
Colorectal cancer (CRC) remains a major life-threatening malignancy, despite numerous therapeutic and screening attempts. Apoptosis and autophagy are two processes that share common signaling pathways, are linked by functional relationships and have similar protein components. During the development of cancer, the two processes can trigger simultaneously in the same cell, causing, in some cases, an inhibition of autophagy by apoptosis or apoptosis by autophagy. Malignant cells that have accumulated genetic alterations can take advantage of any alterations in the apoptotic process and as a result, progress easily in the cancerous transformation. Autophagy often plays a suppressive role during the initial stages of carcinogenicity, while in the later stages of cancer development it can play a promoting role. It is extremely important to determine the regulation of this duality of autophagy in the development of CRC and to identify the molecules involved, as well as the signals and the mechanisms behind it. All the reported experimental results indicate that, while the antagonistic effects of autophagy and apoptosis occur in an adverse environment characterized by deprivation of oxygen and nutrients, leading to the formation and development of CRC, the effects of promotion and collaboration usually involve an auxiliary role of autophagy compared to apoptosis. In this review, we elucidate the different roles of autophagy and apoptosis in human CRC development.
Collapse
Affiliation(s)
- Giulia Orlandi
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Interest in Transplant, Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Via del Pozzo, 71-41124 Modena, Italy
| | - Luca Roncucci
- Department of Medical and Surgical Sciences, University of Modena and Reggio Emilia, Via del Pozzo, 71-41124 Modena, Italy
| | - Gianluca Carnevale
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Interest in Transplant, Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Via del Pozzo, 71-41124 Modena, Italy
| | - Paola Sena
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Interest in Transplant, Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Via del Pozzo, 71-41124 Modena, Italy
| |
Collapse
|
5
|
Tonkin-Reeves A, Giuliani CM, Price JT. Inhibition of autophagy; an opportunity for the treatment of cancer resistance. Front Cell Dev Biol 2023; 11:1177440. [PMID: 37363731 PMCID: PMC10290173 DOI: 10.3389/fcell.2023.1177440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 05/24/2023] [Indexed: 06/28/2023] Open
Abstract
The process of macroautophagy plays a pivotal role in the degradation of long-lived, superfluous, and damaged proteins and organelles, which are later recycled for cellular use. Normal cells rely on autophagy to combat various stressors and insults to ensure survival. However, autophagy is often upregulated in cancer cells, promoting a more aggressive phenotype that allows mutated cells to evade death after exposure to therapeutic treatments. As a result, autophagy has emerged as a significant factor in therapeutic resistance across many cancer types, with underlying mechanisms such as DNA damage, cell cycle arrest, and immune evasion. This review provides a comprehensive summary of the role of autophagy in therapeutic resistance and the limitations of available autophagic inhibitors in cancer treatment. It also highlights the urgent need to explore new inhibitors that can synergize with existing therapies to achieve better patient treatment outcomes. Advancing research in this field is crucial for developing more effective treatments that can help improve the lives of cancer patients.
Collapse
Affiliation(s)
- Asha Tonkin-Reeves
- Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Melbourne, VIC, Australia
| | - Charlett M. Giuliani
- Institute for Health and Sport, Victoria University, Melbourne, VIC, Australia
- Australian Institute for Musculoskeletal Science (AIMSS), Victoria University and Western Health, Melbourne, VIC, Australia
| | - John T. Price
- Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Melbourne, VIC, Australia
- Institute for Health and Sport, Victoria University, Melbourne, VIC, Australia
- Australian Institute for Musculoskeletal Science (AIMSS), Victoria University and Western Health, Melbourne, VIC, Australia
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC, Australia
| |
Collapse
|
6
|
Abstract
Autophagy is a self-digestion process by which misfolded proteins and damaged organelles in eukaryotic cells are degraded to maintain cellular homeostasis. This process is involved in the tumorigenesis, metastasis, and chemoresistance of various tumors such as ovarian cancer (OC). Noncoding RNAs (ncRNAs), mainly including microRNAs, long noncoding RNAs, and circular RNAs, have been extensively investigated in cancer research for their roles in the regulation of autophagy. Recent studies have shown that in OC cells, ncRNAs can modulate the formation of autophagosomes, which affect tumor progression and chemoresistance. An understanding of the role of autophagy in OC progression, treatment, and prognosis is important, and the identification of the regulatory roles of ncRNAs in autophagy leads to intervention strategies for OC therapy. This review summarizes the role of autophagy in OC and discusses the role of ncRNA-mediated autophagy in OC, as an understanding of these roles may contribute to the development of potential therapeutic strategies for this disease.
Collapse
Affiliation(s)
- Cong Feng
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Heilongjiang University of Chinese Medicine, Harbin 150040, P.R. China
- Heilongjiang University of Chinese Medicine, Harbin 150040, P.R. China
| | - Xingxing Yuan
- Heilongjiang University of Chinese Medicine, Harbin 150040, P.R. China
- Department of Gastroenterology, Heilongjiang Academy of Traditional Chinese Medicine, Harbin 150001, P.R. China
| |
Collapse
|
7
|
Tabandeh MR, Soroush F, Dayer D. Itaconic Acid as A Differential Transcription Regulator of Apoptosis and Autophagy Pathways Genes: A Rat Adipose Mesenchymal Stem Cells Model. CELL JOURNAL 2022; 24:586-595. [PMID: 36259476 PMCID: PMC9617019 DOI: 10.22074/cellj.2022.8320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Itaconate, a novel regulatory immunometabolite, is synthesized by inflammatory macrophage. It acts as an anti-inflammatory mediator and regulates several metabolic and signaling pathways particularly Nrf2 pathway. The immunometabolites can affect the stemness potency, differentiation ability and viability of stem cells, but little is known about the critical function of Itaconate on the stem cell fate. The objective of the present study was to determine the regulatory effects of Itaconic acid on the cell viability and transcription of apoptosis and autophagy pathways genes in the rat adipose derived mesenchymal stem cells (ADMSCs). MATERIALS AND METHODS In this experimental study, the ADMSCs were incubated with 125 μM and 250 μM dimethyl itaconate (DMI) for 24 hours or 48 hours. The expression of apoptosis pathway genes (Bax, Bcl2, Caspase 3, Fas, Fadd and Caspase 8) and autophagy pathway genes (Atg12, Atg5, Beclin, Lc3b and P62) were determined using real time polymerase chain reaction (PCR) assay. Using the ELISA method, cellular level of phospho-NRF2 protein was measured. RESULTS The results indicated that DMI increased the expression of NRF2 protein, altered the expression of some apoptosis genes (Fadd, Bax and Bcl2), and changed the expression of some autophagy related genes (Lc3b, Becline and P62) in ADMSCs. DMI had no obvious effect on the transcription of caspases enzymes. CONCLUSION Because autophagy activation and apoptosis suppression can protect stem cells against environmental stress, it seems Itaconate can affect the functions and viability of ADMSCs via converse regulation of these pathways.
Collapse
Affiliation(s)
- Mohammad Reza Tabandeh
- Department of Basic Sciences, Division of Biochemistry and Molecular Biology, Faculty of Veterinary Medicine, Shahid Chamran
University of Ahvaz, Ahvaz, Iran,P.O.Box: 61355-145Department of Basic SciencesDivision of Biochemistry and Molecular BiologyFaculty of
Veterinary MedicineShahid Chamran University of AhvazAhvazIran
| | - Fatemeh Soroush
- Department of Basic Sciences, Division of Biochemistry and Molecular Biology, Faculty of Veterinary Medicine, Shahid Chamran
University of Ahvaz, Ahvaz, Iran
| | - Dian Dayer
- Cellular and Molecular Research Center, Medical Basic Sciences Institute, Ahvaz Jundishapur University of Medical Sciences,
Ahvaz, Iran
| |
Collapse
|
8
|
Quercetin induces autophagy-associated death in HL-60 cells through CaMKKβ/AMPK/mTOR signal pathway. Acta Biochim Biophys Sin (Shanghai) 2022; 54:1244-1256. [PMID: 36148953 PMCID: PMC9827794 DOI: 10.3724/abbs.2022117] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Acute myeloid leukemia (AML) is one of the most common malignancies of the hematopoietic progenitor cell in adults. Quercetin has gained recognition over the years because of its anti-cancer effect with minimal toxicity. Herein, we aim to investigate the anti-leukemia mechanism of quercetin and to decipher the signaling pathway of quercetin in HL-60 leukemic cells. We observed that quercetin induces apoptosis and autophagic cell death, in which both pathways play an important role in suppressing the viability of leukemia cells. Phosphorylated AMPK (p-AMPK) protein expressions are lower in primary AML cells, HL-60 cells, KG-1 and THP-1 cells than in peripheral blood monocular cells. After quercetin treatment, the expression of p-AMPK is increased while the expression of p-mTOR is decreased in a dose-dependent manner. Mechanistically, compound C, an AMPK phosphorylation inhibitor, upregulates the phosphorylation of mTOR and inhibits autophagy and apoptosis in quercetin-induced HL-60 cells, while silencing of CaMKKβ inhibits the quercetin-induced phosphorylation of AMPK, resulting in increased mTOR phosphorylation. Furthermore, silencing of CaMKKβ inhibits the autophagy in HL-60 cells. Taken together, our data delineate that quercetin plays its anti-leukemia role by inhibiting cell viability and inducing apoptosis and autophagy in leukemia cells. Quercetin inhibits the phosphorylation of mTOR by regulating the activity of AMPK, thus playing a role in the regulation of autophagy and apoptosis. CaMKKβ is a potential upstream molecule for AMPK/mTOR signaling pathway, through which quercetin induces autophagy in HL-60 cells.
Collapse
|
9
|
Palumbo C, Mecchia A, Bocedi A, Aquilano K, Lettieri-Barbato D, Rosina M, Di Venere A, Rodolfo C, Caccuri AM. Revisited role of TRAF2 and TRAF2 C-terminal domain in endoplasmic reticulum stress-induced autophagy in HAP1 leukemia cells. Int J Biochem Cell Biol 2022; 145:106193. [PMID: 35257890 DOI: 10.1016/j.biocel.2022.106193] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Revised: 02/18/2022] [Accepted: 03/03/2022] [Indexed: 12/01/2022]
Abstract
The scaffold protein Tumor Necrosis Factor Receptor-Associated Factor 2 (TRAF2) has been reported to play a key role in the endoplasmic reticulum (ER) stress-induced activation of c-Jun N-terminal Kinase (JNK) and hence autophagy. Autophagy is a highly conserved catabolic process, whose dysregulation is involved in the pathogenesis of various human diseases, including cancer. We investigated the involvement of TRAF2 in autophagy regulation in the human leukemic HAP1 cell line, under both basal and ER stress conditions. In TRAF2-knockout HAP1 cell line (KO), the basal autophagic flux was higher than in the parental cell line (WT). Moreover, tunicamycin-induced ER stress stimulated JNK activation and autophagy both in WT and KO HAP1. On the other hand, re-expression of a TRAF2 C-terminal fragment (residues ,310-501), in a TRAF2-KO cellular background, rendered HAP1 cells unable to activate both JNK and autophagy upon ER stress induction. Of note, this apparent dominant negative effect of the C-terminal fragment was observed even in the absence of the endogenous, full-length TRAF2 molecule. Furthermore, the expression of the C-terminal fragment resulted in both protein kinase B (AKT) pathway activation and increased resistance to the toxic effects induced by prolonged ER stress conditions. These findings indicate that TRAF2 is dispensable for the activation of both JNK and autophagy in HAP1 cells, while the TRAF2 C-terminal domain may play an autonomous role in regulating the cellular response to ER stress.
Collapse
Affiliation(s)
- Camilla Palumbo
- Department of Clinical Sciences and Translational Medicine, University of Rome Tor Vergata, Rome, Italy
| | | | - Alessio Bocedi
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Rome, Italy
| | - Katia Aquilano
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Daniele Lettieri-Barbato
- Department of Biology, University of Rome Tor Vergata, Rome, Italy; IRCCS-Fondazione Santa Lucia, Rome, Italy
| | - Marco Rosina
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Almerinda Di Venere
- Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy
| | - Carlo Rodolfo
- Department of Biology, University of Rome Tor Vergata, Rome, Italy; Department of Pediatric Onco-Hematology and Cell and Gene Therapy, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Anna Maria Caccuri
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Rome, Italy; The NAST Centre for Nanoscience and Nanotechnology and Innovative Instrumentation, University of Rome Tor Vergata, Rome, Italy.
| |
Collapse
|
10
|
Kong Q, Yan X, Cheng M, Jiang X, Xu L, Shen L, Yu H, Sun L. p62 Promotes the Mitochondrial Localization of p53 through Its UBA Domain and Participates in Regulating the Sensitivity of Ovarian Cancer Cells to Cisplatin. Int J Mol Sci 2022; 23:ijms23063290. [PMID: 35328718 PMCID: PMC8949157 DOI: 10.3390/ijms23063290] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/05/2022] [Accepted: 03/16/2022] [Indexed: 02/06/2023] Open
Abstract
Chemotherapeutic drug-induced p53-dependent crosstalk among tumor cells affects the sensitivity of tumor cells to chemotherapeutic drugs, contributing to chemoresistance. Therefore, pharmacological targeting of p53 may contribute to overcoming drug resistance. The localization of p53 is closely related to its function. Thus, we assessed the effect of p62 on the coordination of p53 mitochondrial localization under chemotherapeutic drug treatment in ovarian cancer cells. We found that the combined use of the proteasome inhibitor epoxomicin and cisplatin led to the accumulation of p53 and sequestosome1(p62) in the mitochondria, downregulated mitochondrial DNA (mtDNA) transcription, inhibited mitochondrial functions, and ultimately promoted apoptosis by enhancing cisplatin sensitivity in ovarian cancer cells. Moreover, the ubiquitin-associated (UBA) domain of p62 was involved in regulating the mitochondrial localization of p53. Our findings suggest that the interaction between p62 and p53 may be a mechanism that determines the fate of tumor cells. In conclusion, p62 coordinated the mitochondrial localization of p53 through its UBA domain, inhibited mtDNA transcription, downregulated mitochondrial function, and promoted ovarian cancer cell death. Our study demonstrates the important role of p53 localization in tumor cell survival and apoptosis, and provides new insights into understanding the anti-tumor mechanism of targeting the ubiquitin–proteasome system in tumor cells.
Collapse
Affiliation(s)
- Qinghuan Kong
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Xiaoyu Yan
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Meiyu Cheng
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Xin Jiang
- Department of Biochemistry, College of Basic Medical Sciences, Jilin University, Changchun 130021, China;
| | - Long Xu
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Luyan Shen
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Huimei Yu
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
- Correspondence: (H.Y.); (L.S.); Tel.: +86-0-431-8561-9485 or +86-0-431-8561-9110 (H.Y. & L.S.)
| | - Liankun Sun
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
- Correspondence: (H.Y.); (L.S.); Tel.: +86-0-431-8561-9485 or +86-0-431-8561-9110 (H.Y. & L.S.)
| |
Collapse
|
11
|
Guo J, Du X, Li C. BAG family proteins contributes to autophagy-mediated multidrug resistance of tumor. Clin Transl Oncol 2022; 24:1492-1500. [PMID: 35278199 DOI: 10.1007/s12094-022-02819-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 02/22/2022] [Indexed: 12/13/2022]
Abstract
Multidrug resistance (MDR) is a significant cause of tumor treatment failure. Accumulating evidence suggests that autophagy plays a significant role in the development of MDR. Autophagy is a conserved mechanism that maintains tumor homeostasis by removing damaged mitochondria. However, the specific regulatory mechanism is unclear. Here, we summarize recent studies on the role of autophagy in the development of MDR and the initiation of mitophagy by Bcl-2-associated athanogene (BAG) family proteins. Additionally, this mini-review emphasizes the regulatory role of BAG family proteins, which maintain mitochondrial homeostasis by regulating the PINK1/Parkin pathway. Elucidation of the regulatory mechanisms of mitophagy may foster the development of clinical therapeutic strategies for MDR tumors.
Collapse
Affiliation(s)
- Jufang Guo
- Department of Obstetrics and Gynecology, Jinniu District Maternal and Child Health Hospital, Chengdu, China
| | - Xuelian Du
- Department of Obstetrics and Gynecology, Jinniu District Maternal and Child Health Hospital, Chengdu, China
| | - Chaolin Li
- Department of Obstetrics and Gynecology, Jinniu District Maternal and Child Health Hospital, Chengdu, China.
| |
Collapse
|
12
|
Yan X, Tian R, Sun J, Zhao Y, Liu B, Su J, Li M, Sun W, Xu X. Sorafenib-Induced Autophagy Promotes Glycolysis by Upregulating the p62/HDAC6/HSP90 Axis in Hepatocellular Carcinoma Cells. Front Pharmacol 2022; 12:788667. [PMID: 35250553 PMCID: PMC8888828 DOI: 10.3389/fphar.2021.788667] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 12/21/2021] [Indexed: 01/23/2023] Open
Abstract
Sorafenib has attracted much attention as the first drug approved by the FDA for the treatment of advanced hepatocellular carcinoma (HCC). Because of the drug tolerance, the overall outcomes were far from satisfactory. Current studies suggest that changes in glucose metabolism induced by sorafenib are the pivotal resistant mechanism of HCC cells, but the specific regulatory mechanism remains unclear, which makes it difficult to increase drug sensitivity by targeting glycolysis. As a metabolic-recycling pathway, autophagy regulates multiple important pathways involved in cell survival and death. In this study, we found the expression of key autophagy proteins were closely related to the prognosis and progression of HCC patients. Based on in vitro experiments, our studies showed sorafenib induced autophagy in HCC cells. Inhibition of autophagy by chloroquine could significantly increase the sensitivity of HCC cells to sorafenib and reverse the enhancement of glycolysis. Furthermore, sorafenib-induced autophagy promoted the deacetylase activity of HDAC6 by degrading p62, which promoted the activity of PKM2 by regulating the acetylation of its critical substrate HSP90. In this study, we investigated the role of autophagy-induced HDAC6 in regulating the key glycolytic enzyme PKM2, which may be helpful to clarify the relationship between autophagy and glycolysis in a sorafenib-resistant mechanism. Targeting p62/HDAC6/HSP90 could herald a potential improvement in HCC therapy.
Collapse
Affiliation(s)
- Xiaoyu Yan
- China-Japan Union Hospital, Jilin University, Changchun, China
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Rui Tian
- China-Japan Union Hospital, Jilin University, Changchun, China
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Jicheng Sun
- China-Japan Union Hospital, Jilin University, Changchun, China
| | - Yuanxin Zhao
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Buhan Liu
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Jing Su
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Minghua Li
- Department of Molecular Biology, College of Basic Medical Sciences Jilin University, Changchun, China
- Jilin Province Zebrafish Genetic Engineering Laboratory, Jilin Province Development and Reform Commission, Jilin, China
| | - Wei Sun
- Department of Molecular Biology, College of Basic Medical Sciences Jilin University, Changchun, China
- Jilin Province Zebrafish Genetic Engineering Laboratory, Jilin Province Development and Reform Commission, Jilin, China
| | - Xuesong Xu
- China-Japan Union Hospital, Jilin University, Changchun, China
- *Correspondence: Xuesong Xu,
| |
Collapse
|
13
|
Hsueh YJ, Chen YN, Tsao YT, Cheng CM, Wu WC, Chen HC. The Pathomechanism, Antioxidant Biomarkers, and Treatment of Oxidative Stress-Related Eye Diseases. Int J Mol Sci 2022; 23:ijms23031255. [PMID: 35163178 PMCID: PMC8835903 DOI: 10.3390/ijms23031255] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 01/20/2022] [Accepted: 01/21/2022] [Indexed: 12/13/2022] Open
Abstract
Oxidative stress is an important pathomechanism found in numerous ocular degenerative diseases. To provide a better understanding of the mechanism and treatment of oxidant/antioxidant imbalance-induced ocular diseases, this article summarizes and provides updates on the relevant research. We review the oxidative damage (e.g., lipid peroxidation, DNA lesions, autophagy, and apoptosis) that occurs in different areas of the eye (e.g., cornea, anterior chamber, lens, retina, and optic nerve). We then introduce the antioxidant mechanisms present in the eye, as well as the ocular diseases that occur as a result of antioxidant imbalances (e.g., keratoconus, cataracts, age-related macular degeneration, and glaucoma), the relevant antioxidant biomarkers, and the potential of predictive diagnostics. Finally, we discuss natural antioxidant therapies for oxidative stress-related ocular diseases.
Collapse
Affiliation(s)
- Yi-Jen Hsueh
- Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan; (Y.-J.H.); (Y.-N.C.); (Y.-T.T.); (W.-C.W.)
- Center for Tissue Engineering, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan
| | - Yen-Ning Chen
- Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan; (Y.-J.H.); (Y.-N.C.); (Y.-T.T.); (W.-C.W.)
- Department of Medicine, Chang Gung University College of Medicine, Taoyuan 33305, Taiwan
| | - Yu-Ting Tsao
- Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan; (Y.-J.H.); (Y.-N.C.); (Y.-T.T.); (W.-C.W.)
| | - Chao-Min Cheng
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu 30012, Taiwan;
| | - Wei-Chi Wu
- Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan; (Y.-J.H.); (Y.-N.C.); (Y.-T.T.); (W.-C.W.)
- Department of Medicine, Chang Gung University College of Medicine, Taoyuan 33305, Taiwan
| | - Hung-Chi Chen
- Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan; (Y.-J.H.); (Y.-N.C.); (Y.-T.T.); (W.-C.W.)
- Center for Tissue Engineering, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan
- Department of Medicine, Chang Gung University College of Medicine, Taoyuan 33305, Taiwan
- Correspondence: ; Tel.: +886-3-328-1200 (ext. 7855); Fax: +886-3-328-7798
| |
Collapse
|
14
|
The non-apoptotic function of Caspase-8 in negatively regulating the CDK9-mediated Ser2 phosphorylation of RNA polymerase II in cervical cancer. Cell Mol Life Sci 2022; 79:597. [PMID: 36399280 PMCID: PMC9674771 DOI: 10.1007/s00018-022-04598-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 10/11/2022] [Accepted: 10/13/2022] [Indexed: 11/19/2022]
Abstract
Cervical cancer is the fourth most frequently diagnosed and fatal gynecological cancer. 15-61% of all cases metastasize and develop chemoresistance, reducing the 5-year survival of cervical cancer patients to as low as 17%. Therefore, unraveling the mechanisms contributing to metastasis is critical in developing better-targeted therapies against it. Here, we have identified a novel mechanism where nuclear Caspase-8 directly interacts with and inhibits the activity of CDK9, thereby modulating RNAPII-mediated global transcription, including those of cell-migration- and cell-invasion-associated genes. Crucially, low Caspase-8 expression in cervical cancer patients leads to poor prognosis, higher CDK9 phosphorylation at Thr186, and increased RNAPII activity in cervical cancer cell lines and patient biopsies. Caspase-8 knock-out cells were also more resistant to the small-molecule CDK9 inhibitor BAY1251152 in both 2D- and 3D-culture conditions. Combining BAY1251152 with Cisplatin synergistically overcame chemoresistance of Caspase-8-deficient cervical cancer cells. Therefore, Caspase-8 expression could be a marker in chemoresistant cervical tumors, suggesting CDK9 inhibitor treatment for their sensitization to Cisplatin-based chemotherapy.
Collapse
|
15
|
Yan X, Qu X, Liu B, Zhao Y, Xu L, Yu S, Wang J, Wang L, Su J. Autophagy-Induced HDAC6 Activity During Hypoxia Regulates Mitochondrial Energy Metabolism Through the β-Catenin/COUP-TFII Axis in Hepatocellular Carcinoma Cells. Front Oncol 2021; 11:742460. [PMID: 34868939 PMCID: PMC8636061 DOI: 10.3389/fonc.2021.742460] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 09/29/2021] [Indexed: 01/15/2023] Open
Abstract
Hypoxia is one of the main driving forces that results in poor outcomes and drug resistance in hepatocellular carcinoma (HCC). As the critical cellular oxygen sensor, mitochondria respond to hypoxic stress by sending retrograde signals to the nucleus that initiate adaptive metabolic responses and maintain the survival of HCC cells. Increasing evidence suggested autophagy contributes to sustain mitochondrial metabolic and quality control. Understanding how mitochondria communicate with the nucleus and alter transcription may provide promising targets for HCC treatment. In this study, we found mitochondrial undergoes selective degradation by autophagy under hypoxia. Furthermore, autophagy-activated HDAC6 not only promoted the nuclear translocation of β-catenin but also increased the affinity of β-catenin to the transcription repressor chicken ovalbumin upstream promoter-transcription factor 2 (COUP-TF II), which suppressed mitochondrial oxidative phosphorylation-related genes transcription. Our data showed that autophagy served as a critical mediator of integrating mitochondrial energy metabolism and nuclear transcription. HDAC6 may be a potential target for reducing the survival of HCC cells by interrupting mitochondria-nucleus crosstalk.
Collapse
Affiliation(s)
- Xiaoyu Yan
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Xianzhi Qu
- Department of Hepatobiliary & Pancreatic Surgery, The Second Hospital of Jilin University, Jilin University, Changchun, China
| | - Buhan Liu
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Yuanxin Zhao
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Long Xu
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Sihang Yu
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Jian Wang
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Liying Wang
- Department of Molecular Biology, College of Basic Medical Sciences, Norman Bethune Health Science Center, Jilin University, Changchun, China
| | - Jing Su
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| |
Collapse
|
16
|
S-Adenosylmethionine Increases the Sensitivity of Human Colorectal Cancer Cells to 5-Fluorouracil by Inhibiting P-Glycoprotein Expression and NF-κB Activation. Int J Mol Sci 2021; 22:ijms22179286. [PMID: 34502219 PMCID: PMC8431578 DOI: 10.3390/ijms22179286] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 08/24/2021] [Accepted: 08/24/2021] [Indexed: 01/05/2023] Open
Abstract
Colorectal cancer (CRC) is the second deadliest cancer worldwide despite significant advances in both diagnosis and therapy. The high incidence of CRC and its poor prognosis, partially attributed to multi-drug resistance and antiapoptotic activity of cancer cells, arouse strong interest in the identification and development of new treatments. S-Adenosylmethionine (AdoMet), a natural compound and a nutritional supplement, is well known for its antiproliferative and proapoptotic effects as well as for its potential in overcoming drug resistance in many kinds of human tumors. Here, we report that AdoMet enhanced the antitumor activity of 5-Fluorouracil (5-FU) in HCT 116p53+/+ and in LoVo CRC cells through the inhibition of autophagy, induced by 5-FU as a cell defense mechanism to escape the drug cytotoxicity. Multiple drug resistance is mainly due to the overexpression of drug efflux pumps, such as P-glycoprotein (P-gp). We demonstrate here that AdoMet was able to revert the 5-FU-induced upregulation of P-gp expression and to decrease levels of acetylated NF-κB, the activated form of NF-κB, the major antiapoptotic factor involved in P-gp-related chemoresistance. Overall, our data show that AdoMet, was able to overcome 5-FU chemoresistance in CRC cells by targeting multiple pathways such as autophagy, P-gp expression, and NF-κB signaling activation and provided important implications for the development of new adjuvant therapies to improve CRC treatment and patient outcomes.
Collapse
|
17
|
Tang J, Li Y, Xia S, Li J, Yang Q, Ding K, Zhang H. Sequestosome 1/p62: A multitasker in the regulation of malignant tumor aggression (Review). Int J Oncol 2021; 59:77. [PMID: 34414460 PMCID: PMC8425587 DOI: 10.3892/ijo.2021.5257] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 07/12/2021] [Indexed: 02/06/2023] Open
Abstract
Sequestosome 1 (SQSTM1)/p62 is an adapter protein mainly involved in the transportation, degradation and destruction of various proteins that cooperates with components of autophagy and the ubiquitin-proteasome degradation pathway. Numerous studies have shown that SQSTM1/p62 functions at multiple levels, including involvement in genetic stability or modification, post-transcriptional regulation and protein function. As a result, SQSTM1/p62 is a versatile protein that is a critical core regulator of tumor cell genetic stability, autophagy, apoptosis and other forms of cell death, malignant growth, proliferation, migration, invasion, metastasis and chemoradiotherapeutic response, and an indicator of patient prognosis. SQSTM1/p62 regulates these processes via its distinct molecular structure, through which it participates in a variety of activating or inactivating tumor-related and tumor microenvironment-related signaling pathways, particularly positive feedback loops and epithelial-mesenchymal transition-related pathways. Therefore, functioning as a proto-oncogene or tumor suppressor gene in various types of cancer and tumor-associated microenvironments, SQSTM1/p62 is capable of promoting or retarding malignant tumor aggression, giving rise to immeasurable effects on tumor occurrence and development, and on patient treatment and prognosis.
Collapse
Affiliation(s)
- Jinlong Tang
- Department of Pathology and Oncology, Key Laboratory of Cancer Prevention and Intervention, Ministry of Education, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
| | - Yuan Li
- Department of Pediatrics, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, Zhejiang 310000, P.R. China
| | - Shuli Xia
- Department of Pathology, Zhejiang University School of Medicine, Research Unit of Intelligence Classification of Tumor Pathology and Precision Therapy, Chinese Academy of Medical Sciences, Hangzhou, Zhejiang 310058, P.R. China.,Key Laboratory of Disease Proteomics of Zhejiang Province, Hangzhou, Zhejiang 310058, P.R. China
| | - Jinfan Li
- Department of Pathology and Oncology, Key Laboratory of Cancer Prevention and Intervention, Ministry of Education, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
| | - Qi Yang
- Department of Pathology and Oncology, Key Laboratory of Cancer Prevention and Intervention, Ministry of Education, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
| | - Kefeng Ding
- Department of Colorectal Surgery and Oncology, Key Laboratory of Cancer Prevention and Intervention, Ministry of Education, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China,Cancer Center of Zhejiang University, Hangzhou, Zhejiang 310009, P.R. China
| | - Honghe Zhang
- Department of Pathology, Zhejiang University School of Medicine, Research Unit of Intelligence Classification of Tumor Pathology and Precision Therapy, Chinese Academy of Medical Sciences, Hangzhou, Zhejiang 310058, P.R. China.,Key Laboratory of Disease Proteomics of Zhejiang Province, Hangzhou, Zhejiang 310058, P.R. China
| |
Collapse
|
18
|
The Pathways Underlying the Multiple Roles of p62 in Inflammation and Cancer. Biomedicines 2021; 9:biomedicines9070707. [PMID: 34206503 PMCID: PMC8301319 DOI: 10.3390/biomedicines9070707] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/09/2021] [Accepted: 06/18/2021] [Indexed: 12/12/2022] Open
Abstract
p62 is a highly conserved, multi-domain, and multi-functional adaptor protein critically involved in several important cellular processes. Via its pronounced domain architecture, p62 binds to numerous interaction partners, thereby influencing key pathways that regulate tissue homeostasis, inflammation, and several common diseases including cancer. Via binding of ubiquitin chains, p62 acts in an anti-inflammatory manner as an adaptor for the auto-, xeno-, and mitophagy-dependent degradation of proteins, pathogens, and mitochondria. Furthermore, p62 is a negative regulator of inflammasome complexes. The transcription factor Nrf2 regulates expression of a bundle of ROS detoxifying genes. p62 activates Nrf2 by interaction with and autophagosomal degradation of the Nrf2 inhibitor Keap1. Moreover, p62 activates mTOR, the central kinase of the mTORC1 sensor complex that controls cell proliferation and differentiation. Through different mechanisms, p62 acts as a positive regulator of the transcription factor NF-κB, a central player in inflammation and cancer development. Therefore, p62 represents not only a cargo receptor for autophagy, but also a central signaling hub, linking several important pro- and anti-inflammatory pathways. This review aims to summarize knowledge about the molecular mechanisms underlying the roles of p62 in health and disease. In particular, different types of tumors are characterized by deregulated levels of p62. The elucidation of how p62 contributes to inflammation and cancer progression at the molecular level might promote the development of novel therapeutic strategies.
Collapse
|
19
|
Gong L, Wang K, Wang M, Hu R, Li H, Gao D, Lin M. CUL5-ASB6 Complex Promotes p62/SQSTM1 Ubiquitination and Degradation to Regulate Cell Proliferation and Autophagy. Front Cell Dev Biol 2021; 9:684885. [PMID: 34164402 PMCID: PMC8215545 DOI: 10.3389/fcell.2021.684885] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 05/06/2021] [Indexed: 12/30/2022] Open
Abstract
p62/SQSTM1 (sequestosome-1) is a key protein involved in multiple cellular bioprocesses including autophagy, nutrient sensing, cell growth, cell death, and survival. Therefore, it is implicated in human diseases such as obesity and cancer. Here, we show that the CUL5–ASB6 complex is a ubiquitin E3 ligase complex mediating p62 ubiquitination and degradation. Depletion of CUL5 or ASB6 induced p62 accumulation, and overexpression of ASB6 promoted ubiquitination and degradation of p62. Functionally, ASB6 overexpression can inhibit the proliferation of MEF and hepatocellular carcinoma cells by reducing p62 protein level, and impair the occurrence of autophagy. Overall, our study identified a new molecular mechanism regulating p62 stability, which may provide additional insights for understanding the delicate control of p62 and cell proliferation–autophagy control in physiological and pathological settings.
Collapse
Affiliation(s)
- Liyan Gong
- Center for Clinical Research and Translational Medicine, Yangpu Hospital, Tongji University School of Medicine, Shanghai, China.,Department of General Surgery, Yangpu Hospital, Tongji University School of Medicine, Shanghai, China
| | - Kaihua Wang
- State Key Laboratory of Cell Biology, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Mengcheng Wang
- State Key Laboratory of Cell Biology, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Ronggui Hu
- University of Chinese Academy of Sciences, Beijing, China.,State Key Laboratory of Molecular Biology, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, China
| | - Huaguang Li
- Center for Clinical Research and Translational Medicine, Yangpu Hospital, Tongji University School of Medicine, Shanghai, China
| | - Daming Gao
- State Key Laboratory of Cell Biology, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Moubin Lin
- Center for Clinical Research and Translational Medicine, Yangpu Hospital, Tongji University School of Medicine, Shanghai, China.,Department of General Surgery, Yangpu Hospital, Tongji University School of Medicine, Shanghai, China
| |
Collapse
|
20
|
An Experimentally Induced Mutation in the UBA Domain of p62 Changes the Sensitivity of Cisplatin by Up-Regulating HK2 Localisation on the Mitochondria and Increasing Mitophagy in A2780 Ovarian Cancer Cells. Int J Mol Sci 2021; 22:ijms22083983. [PMID: 33924293 PMCID: PMC8070143 DOI: 10.3390/ijms22083983] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 03/28/2021] [Accepted: 04/06/2021] [Indexed: 01/18/2023] Open
Abstract
The study of cisplatin sensitivity is the key to the development of ovarian cancer treatment strategies. Mitochondria are one of the main targets of cisplatin, its self-clearing ability plays an important role in determining the fate of ovarian cancer cells. First, we proved that the sensitivity of ovarian cancer cells to cisplatin depends on mitophagy, and p62 acts as a broad autophagy receptor to regulate this process. However, p62′s regulation of mitophagy does not depend on its location on the mitochondria. Our research shows that the mutation of the UBA domain of p62 increases the localisation of HK2 on the mitochondria, thereby increasing the phosphorylated ubiquitin form of parkin, then stabilising the process of mitophagy and ultimately cell survival. Collectively, our results showed that a mutation in the UBA domain of p62 regulates the level of apoptosis stimulated by cisplatin in ovarian cancer.
Collapse
|
21
|
Qin L, Zhao T, Liu X, Wang H, Gu X, Chen D, Wang Z, He D. Malignant transformation arising from mature ovarian cystic teratoma: A case series. Medicine (Baltimore) 2021; 100:e24726. [PMID: 33787574 PMCID: PMC8021333 DOI: 10.1097/md.0000000000024726] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 01/18/2021] [Indexed: 01/04/2023] Open
Abstract
Malignant transformation arising in mature cystic teratoma (MT-MCT) is a rare neoplasm of the ovary. Herein, we aimed to evaluate the clinicopathological features and treatment outcome of the Han Chinese women with MT-MCT.In this retrospective study, the clinical data of patients who had been surgically treated from January 2000 to November 2019 and in whom the diagnosis of MCT was confirmed based on the pathology were included. Fourteen patients with MT-MCT from a total of 569 cases (2.46% incidence) of MCT were reviewed.The mean age of patients with MT-MCT was 51.3 (range, 31-71) years, while the mean age of patients with MCT was 45.3 (range, 17-62) years. Upon gross examination, the mean size of MT-MCT was 14.0 (range, 11-25) cm, whereas the mean size of MCT was 7.5 (range, 4-10) cm. Primary surgical staging was performed in all cases. Complete cytoreduction and suboptimal surgical resection were performed in 12 (85.7%) and 2 (14.3%) cases, respectively. Thirteen patients with malignant transformation of squamous cell carcinoma (SCC) whose Federation International of Gynecology and Obstetrics stage was >1 received chemotherapy, comprising carboplatin and paclitaxel. Response to the chemotherapy regimen was complete in 12 patients; 1/12 patients died within the median follow-up period of 16.5 months. The 5-year overall survival rate and disease-free survival rates were 31.2% and 31.6%, respectively.From the data generated, we conclude that the rate of MT-MCT increases with age. The MT-MCT was much higher in women of postmenopausal age than in younger women. We described our experience of successfully treating patients with malignant transformation of SCC with primary surgical staging and adjuvant chemotherapy (cisplatin, paclitaxel, bleomycin, and etoposide) that might improve survival in patients with advanced-stage disease.
Collapse
Affiliation(s)
- Li Qin
- Department of Obstetrics and Gynecology, The Central Hospital of Enshi Autonomous Prefecture
| | - Tao Zhao
- Department of Oncology, Lichuan People's Hospital
| | - Xin Liu
- Department of Pathology, Minda Hospital of Hubei Minzu University
| | | | - Xin Gu
- Department of Obstetrics and Gynecology, The Central Hospital of Enshi Autonomous Prefecture
| | | | - Zaiping Wang
- Department of Anesthesiology, The Central Hospital of Enshi Autonomous Prefecture, Enshi, China
| | | |
Collapse
|
22
|
Theasaponin E 1 Inhibits Platinum-Resistant Ovarian Cancer Cells through Activating Apoptosis and Suppressing Angiogenesis. Molecules 2021; 26:molecules26061681. [PMID: 33802884 PMCID: PMC8002815 DOI: 10.3390/molecules26061681] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/14/2021] [Accepted: 03/15/2021] [Indexed: 12/28/2022] Open
Abstract
Novel therapeutic strategies for ovarian cancer treatment are in critical need due to the chemoresistance and adverse side effects of platinum-based chemotherapy. Theasaponin E1 (TSE1) is an oleanane-type saponin from Camellia sinensis seeds. Its apoptosis-inducing, cell cycle arresting and antiangiogenesis activities against platinum-resistant ovarian cancer cells were elucidated in vitro and using the chicken chorioallantoic membrane (CAM) assay. The results showed that TSE1 had more potent cell growth inhibitory effects on ovarian cancer OVCAR-3 and A2780/CP70 cells than cisplatin and was lower in cytotoxicity to normal ovarian IOSE-364 cells. TSE1 significantly induced OVCAR-3 cell apoptosis via the intrinsic and extrinsic apoptotic pathways, slightly arresting cell cycle at the G2/M phase, and obviously inhibited OVCAR-3 cell migration and angiogenesis with reducing the protein secretion and expression of vascular endothelial growth factor (VEGF). Western bolt assay showed that Serine/threonine Kinase (Akt) signaling related proteins including Ataxia telangiectasia mutated kinase (ATM), Phosphatase and tensin homolog (PTEN), Akt, Mammalian target of rapamycin (mTOR), Ribosome S6 protein kinase (p70S6K) and e IF4E-binding protein 1(4E-BP1) were regulated, and Hypoxia inducible factor-1α (HIF-1α) protein expression was decreased by TSE1 in OVCAR-3 cells. Moreover, TSE1 treatment potently downregulated protein expression of the Notch ligands including Delta-like protein 4 (Dll4) and Jagged1, and reduced the protein level of the intracellular domain (NICD) of Notch1. Combination treatment of TSE1 with the Notch1 signaling inhibitor tert-butyl (2S)-2-[[(2S)-2-[[2-(3,5-difluorophenyl)acetyl]amino]propanoyl]amino]-2-phenylacetate (DAPT), or the Akt signaling inhibitor wortmannin, showed a stronger inhibition toward HIF-1α activation compared with single compound treatment. Taken together, TSE1 might be a potential candidate compound for improving platinum-resistant ovarian cancer treatment via Dll4/Jagged1-Notch1-Akt-HIF-1α axis.
Collapse
|
23
|
Shen L, Xia M, Zhang Y, Luo H, Dong D, Sun L. Mitochondrial integration and ovarian cancer chemotherapy resistance. Exp Cell Res 2021; 401:112549. [PMID: 33640393 DOI: 10.1016/j.yexcr.2021.112549] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 02/21/2021] [Accepted: 02/23/2021] [Indexed: 10/22/2022]
Abstract
Ovarian cancer has been nicknamed the "silent killer". Most patients with ovarian cancer are diagnosed at an advanced stage of the disease for the first time because of its insignificant early clinical symptoms. In addition to the difficulty of early screening and delay in diagnosis, the high recurrence rate and relapsed refractory status of patients with ovarian cancer are also important factors for their high mortality. Patients with recurrent ovarian cancer often use neoadjuvant chemotherapy followed by surgery as the first choice. However, this is often accompanied by chemotherapy resistance, leading to treatment failure and a mortality rate of more than 90%. In the past, it was believed that the anti-tumor effect of chemotherapeutics represented by cisplatin was entirely attributable to its irreversible damage to DNA, but current research has found that it can inhibit cell growth and cytotoxicity via nuclear and cytoplasmic coordinated integration. As an important hub and integration platform for intracellular signal communication, mitochondria are responsible for multiple key factors during tumor occurrence and development, such as metabolic reprogramming, acquisition of metastatic ability, and chemotherapy drug response. The role of mitochondria in ovarian cancer chemotherapy resistance is becoming increasingly recognized. In this review, we discuss the cellular interactive regulatory network surrounding mitochondria, elucidate the mechanisms of tumor cell survival under chemotherapy, and discuss potential means of interfering with mitochondrial function as a novel anti-cancer therapy.
Collapse
Affiliation(s)
- Luyan Shen
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Meihui Xia
- Department of Obstetrics, The First Bethune Hospital of Jilin University, Changchun, Jilin, China
| | - Yu Zhang
- Laboratory Teaching Center of Basic Medicine, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Haoge Luo
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Delu Dong
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China.
| | - Liankun Sun
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China.
| |
Collapse
|
24
|
Janciauskiene S, Wrenger S, Günzel S, Gründing AR, Golpon H, Welte T. Potential Roles of Acute Phase Proteins in Cancer: Why Do Cancer Cells Produce or Take Up Exogenous Acute Phase Protein Alpha1-Antitrypsin? Front Oncol 2021; 11:622076. [PMID: 33680966 PMCID: PMC7933442 DOI: 10.3389/fonc.2021.622076] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 01/06/2021] [Indexed: 01/08/2023] Open
Abstract
An association between acute-phase proteins (APPs) and cancer has long been established and there are numerous reports correlating altered levels and/or molecular forms of APPs with different types of cancers. Many authors have shown a positive correlation between high levels of APPs, like alpha1-antitrypsin (AAT), and unfavorable clinical outcome in cancers. Conversely, others proposed that high levels of APPs are probably just a part of nonspecific inflammatory response to cancer development. However, this might not be always true, because many cancerous cells produce or take up exogenous APPs. What is the biological significance of this and what benefit do cancer cells have from these proteins remains largely unknown. Recent data revealed that some APPs, including AAT, are able to enhance cancer cell resistance against anticancer drug-induced apoptosis and autophagy. In this review, we specifically discuss our own findings and controversies in the literature regarding the role of AAT in cancer.
Collapse
Affiliation(s)
- Sabina Janciauskiene
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
| | - Sabine Wrenger
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
| | - Steffen Günzel
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
| | - Anna Ricarda Gründing
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
| | - Heiko Golpon
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
| | - Tobias Welte
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
| |
Collapse
|
25
|
Li T, Jia L, Deng Y, Wang B, Quan S. TIPE1 impairs ovarian tumor growth by promoting caspase-dependent apoptosis. Oncol Lett 2020; 20:365. [PMID: 33133265 PMCID: PMC7590423 DOI: 10.3892/ol.2020.12227] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Accepted: 09/14/2020] [Indexed: 12/14/2022] Open
Abstract
Tumor necrosis factor-α-induced protein 8-like 1 (TIPE1) functions as a tumor suppressor in several types of cancer, including lung and breast cancer. The present study aimed to determine the level of expression and the function of TIPE1 in ovarian cancer. TIPE1 expression was determined in tissue microarrays and ovarian cancer cells, and these data were analyzed to assess the association between TIPE1 expression and prognosis in patients with ovarian cancer. The potential antitumor effects of TIPE1 were investigated in vitro and in a xenograft mouse model. Furthermore, the underlying molecular mechanism by which TIPE1 regulates ovarian cancer growth was determined via flow cytometric analysis, western blotting and rescue experiments. The results of the present study indicated that TIPE1 levels were markedly decreased in ovarian cancer tissues, and its level of expression was associated with a favorable prognosis of patients with ovarian cancer. In addition, ectopic TIPE1 expression significantly impaired A2780 and SKOV3 cell proliferation and colony formation in vitro, which was accompanied by efficient inhibition of xenograft tumor growth in mice. Investigations into the underlying molecular mechanism demonstrated that TIPE1 induced ovarian cancer cell apoptosis by promoting caspase protein expression. Inhibition of caspase-dependent apoptosis by z-VAD blocked TIPE1-mediated inhibition of the proliferation and induction of apoptosis in ovarian cancer cells. Collectively, the results of the present study suggest that TIPE1 may be a potential prognostic predictor and therapeutic target for patients with ovarian cancer.
Collapse
Affiliation(s)
- Tingting Li
- Department of Gynecology and Obstetrics, Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China.,Reproductive Medicine Research Center, Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong 510655, P.R. China
| | - Lei Jia
- Reproductive Medicine Research Center, Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong 510655, P.R. China.,Laboratory Medicine Center, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Yu Deng
- Assisted Reproductive Medical Center, Guangzhou Women and Children's Hospital, Guangzhou, Guangdong 510623, P.R. China
| | - Bo Wang
- Reproductive Medicine Research Center, Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong 510655, P.R. China
| | - Song Quan
- Department of Gynecology and Obstetrics, Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| |
Collapse
|
26
|
The role of caspase-8 in the tumor microenvironment of ovarian cancer. Cancer Metastasis Rev 2020; 40:303-318. [PMID: 33026575 PMCID: PMC7897206 DOI: 10.1007/s10555-020-09935-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 09/23/2020] [Indexed: 12/17/2022]
Abstract
Caspase-8 is an aspartate-specific cysteine protease, which is best known for its apoptotic functions. Caspase-8 is placed at central nodes of multiple signal pathways, regulating not only the cell cycle but also the invasive and metastatic cell behavior, the immune cell homeostasis and cytokine production, which are the two major components of the tumor microenvironment (TME). Ovarian cancer often has dysregulated caspase-8 expression, leading to imbalance between its apoptotic and non-apoptotic functions within the tumor and the surrounding milieu. The downregulation of caspase-8 in ovarian cancer seems to be linked to high aggressiveness with chronic inflammation, immunoediting, and immune resistance. Caspase-8 plays therefore an essential role not only in the primary tumor cells but also in the TME by regulating the immune response, B and T lymphocyte activation, and macrophage differentiation and polarization. The switch between M1 and M2 macrophages is possibly associated with changes in the caspase-8 expression. In this review, we are discussing the non-apoptotic functions of caspase-8, highlighting this protein as a modulator of the immune response and the cytokine composition in the TME. Considering the low survival rate among ovarian cancer patients, it is urgently necessary to develop new therapeutic strategies to optimize the response to the standard treatment. The TME is highly heterogenous and provides a variety of opportunities for new drug targets. Given the variety of roles of caspase-8 in the TME, we should focus on this protein in the development of new therapeutic strategies against the TME of ovarian cancer.
Collapse
|
27
|
Zhang W, Zhang S, Guan W, Huang Z, Kong J, Huang C, Wang H, Yang S. Poly C Binding Protein 1 Regulates p62/SQSTM1 mRNA Stability and Autophagic Degradation to Repress Tumor Progression. Front Genet 2020; 11:930. [PMID: 32922440 PMCID: PMC7457068 DOI: 10.3389/fgene.2020.00930] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 07/27/2020] [Indexed: 12/11/2022] Open
Abstract
Accumulating evidence show that Poly C Binding Protein 1 (PCBP1) is deleted in distinct types of tumors as a novel tumor suppressor, but its tumor suppression mechanism remains elusive. Here, we firstly describe that downregulation of PCBP1 is significantly associated with clinical ovarian tumor progression. Mechanistically, PCBP1 overexpression affects various autophagy-related genes expression at various expression levels to attenuate the intrinsic cell autophagy, including the autophagy-initiating ULK, ATG12, ATG7 as well as the bona fide marker of autophagosome, LC3B. Accordingly, knockdown of the endogenous PCBP1 in turn enhances autophagy and less cell death. Meanwhile, PCBP1 upregulates p62/SQSTM1 via inhibition p62/SQSTM1 autophagolysome and proteasome degradation as well as its mRNA stability, consequently accompanying with the caspase 3 or 8 activation for tumor cell apoptosis. Importantly, clinical ovary cancer sample analysis consistently validates the relevance of PCBP1 expression to both p62/SQSTM1 and caspase-8 to overall survival, and indicates PCBP1 may be a master player to repress tumor initiation. Taken together, our results uncover the tumorigenic mechanism of PCBP1 depletion and suggest that inhibition of tumor cell autophagy with autophagic inhibitors could be an effective therapeutical strategy for PCBP1-deficient tumor.
Collapse
Affiliation(s)
- Wenliang Zhang
- Translational Medicine Centre, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Department of Biochemistry, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Shaoyang Zhang
- Department of Biochemistry, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Wen Guan
- Department of Biochemistry, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Zhicong Huang
- Department of Biochemistry, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Jianqiu Kong
- Department of Biochemistry, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Chunlong Huang
- Department of Hepatobiliary Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Haihe Wang
- Department of Biochemistry, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Center for Stem Cell Biology and Tissue Engineering, Sun Yat-sen University, Guangzhou, China
| | - Shulan Yang
- Translational Medicine Centre, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Guangdong Engineering and Technology Research Center for Disease-Model Animals, Sun Yat-sen University, Guangzhou, China
| |
Collapse
|
28
|
Emanuele S, Lauricella M, D’Anneo A, Carlisi D, De Blasio A, Di Liberto D, Giuliano M. p62: Friend or Foe? Evidences for OncoJanus and NeuroJanus Roles. Int J Mol Sci 2020; 21:ijms21145029. [PMID: 32708719 PMCID: PMC7404084 DOI: 10.3390/ijms21145029] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 07/13/2020] [Accepted: 07/14/2020] [Indexed: 02/06/2023] Open
Abstract
p62 is a versatile protein involved in the delicate balance between cell death and survival, which is fundamental for cell fate decision in the context of both cancer and neurodegenerative diseases. As an autophagy adaptor, p62 recognizes polyubiquitin chains and interacts with LC3, thereby targeting the selected cargo to the autophagosome with consequent autophagic degradation. Beside this function, p62 behaves as an interactive hub in multiple signalling including those mediated by Nrf2, NF-κB, caspase-8, and mTORC1. The protein is thus crucial for the control of oxidative stress, inflammation and cell survival, apoptosis, and metabolic reprogramming, respectively. As a multifunctional protein, p62 falls into the category of those factors that can exert opposite roles in the cells. Chronic p62 accumulation was found in many types of tumors as well as in stress granules present in different forms of neurodegenerative diseases. However, the protein seems to have a Janus behaviour since it may also serve protective functions against tumorigenesis or neurodegeneration. This review describes the diversified roles of p62 through its multiple domains and interactors and specifically focuses on its oncoJanus and neuroJanus roles.
Collapse
Affiliation(s)
- Sonia Emanuele
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), University of Palermo, Via del Vespro 129, 90127 Palermo, Italy; (M.L.); (D.C.); (D.D.L.)
- Correspondence:
| | - Marianna Lauricella
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), University of Palermo, Via del Vespro 129, 90127 Palermo, Italy; (M.L.); (D.C.); (D.D.L.)
| | - Antonella D’Anneo
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), Laboratory of Biochemistry, University of Palermo, Via del Vespro 129, 90127 Palermo, Italy; (A.D.); (A.D.B.); (M.G.)
| | - Daniela Carlisi
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), University of Palermo, Via del Vespro 129, 90127 Palermo, Italy; (M.L.); (D.C.); (D.D.L.)
| | - Anna De Blasio
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), Laboratory of Biochemistry, University of Palermo, Via del Vespro 129, 90127 Palermo, Italy; (A.D.); (A.D.B.); (M.G.)
| | - Diana Di Liberto
- Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), University of Palermo, Via del Vespro 129, 90127 Palermo, Italy; (M.L.); (D.C.); (D.D.L.)
| | - Michela Giuliano
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), Laboratory of Biochemistry, University of Palermo, Via del Vespro 129, 90127 Palermo, Italy; (A.D.); (A.D.B.); (M.G.)
| |
Collapse
|
29
|
Hu X, Xia M, Wang J, Yu H, Chai J, Zhang Z, Sun Y, Su J, Sun L. Dual PI3K/mTOR inhibitor PKI-402 suppresses the growth of ovarian cancer cells by degradation of Mcl-1 through autophagy. Biomed Pharmacother 2020; 129:110397. [PMID: 32585451 DOI: 10.1016/j.biopha.2020.110397] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 06/08/2020] [Accepted: 06/13/2020] [Indexed: 11/25/2022] Open
Abstract
The phosphoinositide 3-kinase (PI3K) /AKT/mammalian target of rapamycin (mTOR) signaling pathway is frequently mutated in cancers, leading to increased cell proliferation, migration, and chemoresistance. Currently, a number of small molecule inhibitors of the PI3K/AKT/mTOR signaling pathway have been assessed in preclinical and clinical studies. It has been found that dual PI3K/mTOR inhibitors may inhibit cell proliferation and induce apoptosis in cancers, but the mechanism is still being explored. Therefore, determining the role of dual PI3K/mTOR inhibitors PKI-402 in cancer cells may facilitate overcoming chemoresistance. By referring to a gene database and screening gene sequences, we found that human ovarian cancer epithelial cell lines SKOV3 and A2780 had mutations of the PIK3CA gene, which might be relatively sensitive to dual-targeted PI3K/mTOR inhibitors. In this study, our data indicated that dual PI3K/mTOR inhibitor PKI-402 disrupted the balance of Bcl-2 family proteins by degrading the Mcl-1 protein through autophagy. Moreover, the autophagy receptor protein p62 bound to Mcl-1 through its ubiquitin-associated domain (UBA domain) to participate in the degradation of Mcl-1 through autophagy. This offers hope for the treatment of ovarian cancer patients with mutations of the PI3K/AKT/mTOR pathway.
Collapse
Affiliation(s)
- Xiaoqing Hu
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, Jilin, China; The First Hospital of Jilin University, Changchun 130021, Jilin, China
| | - Meihui Xia
- The First Hospital of Jilin University, Changchun 130021, Jilin, China
| | - Jiabin Wang
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, Jilin, China
| | - Huimei Yu
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, Jilin, China
| | - Jiannan Chai
- The First Hospital of Jilin University, Changchun 130021, Jilin, China
| | - Zejun Zhang
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, Jilin, China
| | - Yupei Sun
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, Jilin, China
| | - Jing Su
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, Jilin, China.
| | - Liankun Sun
- Key Laboratory of Pathobiology, Ministry of Education, Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, Jilin, China.
| |
Collapse
|
30
|
Wang Y, Zhu F, Zhang Y, Chen C, Lai Y, Sun J, Chen S, Qiu P, Gao J, Deng G. Shikonin suppresses trophoblast cell growth via regulation of GLI1, and p62 mediated caspase 8 activation. Reprod Toxicol 2020; 95:104-112. [PMID: 32461113 DOI: 10.1016/j.reprotox.2020.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 05/10/2020] [Accepted: 05/18/2020] [Indexed: 10/24/2022]
Abstract
Unruptured ectopic pregnancy (UEP) is a common cause of morbidity and, occasionally, of mortality in women of reproductive age. Pharmacological intervention is a common therapeutic approach for early-stage UEP. Herein, we investigated the cytotoxic effect and novel mechanism of shikonin, a natural naphthoquinone pigment purified from Lithospermum erythrorhizon, in human trophoblast cells. These data demonstrated that shikonin suppressed proliferation and induced apoptosis in a time-dependent manner in HTR-8/SVneo cells. Shikonin blocked autophagic flux and promoted p62 interaction with caspase 8, resulting in caspase 8 activation. Moreover, shikonin suppressed GLI1 expression, and GLI1 overexpression attenuated shikonin-induced cell apoptosis. Although silencing GLI1 slightly promoted cell apoptosis, p62 overexpression enhanced GLI1 silencing-induced cell apoptosis by activating caspase 8. Furthermore, rapamycin increased shikonin-induced cell apoptosis in HTR-8/SVneo cells, whereas 3-MA attenuated the cytotoxic effect of shikonin. In conclusion, shikonin suppressed trophoblast cell growth by silencing GLI1 and increasing p62 co-mediated activation of caspase 8, which suggested a potential novel therapeutic target for UEP.
Collapse
Affiliation(s)
- Yanxi Wang
- First School of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Lingnan Medical Research Center of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Fangfang Zhu
- First School of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Lingnan Medical Research Center of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Yingxuan Zhang
- First School of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Lingnan Medical Research Center of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Chunlin Chen
- First School of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Lingnan Medical Research Center of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Yuling Lai
- First School of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Lingnan Medical Research Center of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Jianhua Sun
- First School of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Lingnan Medical Research Center of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Si Chen
- First School of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Lingnan Medical Research Center of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Pin Qiu
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Jie Gao
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China.
| | - Gaopi Deng
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China.
| |
Collapse
|
31
|
Yan XY, Qu XZ, Xu L, Yu SH, Tian R, Zhong XR, Sun LK, Su J. Insight into the role of p62 in the cisplatin resistant mechanisms of ovarian cancer. Cancer Cell Int 2020; 20:128. [PMID: 32322174 PMCID: PMC7164250 DOI: 10.1186/s12935-020-01196-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 03/28/2020] [Indexed: 02/06/2023] Open
Abstract
Cisplatin is a platinum-based first-line drug for treating ovarian cancer. However, chemotherapy tolerance has limited the efficacy of cisplatin for ovarian cancer patients. Research has demonstrated that cisplatin causes changes in cell survival and death signaling pathways through its interaction with macromolecules and organelles, which indicates that investigation into the DNA off-target effects of cisplatin may provide critical insights into the mechanisms underlying drug resistance. The multifunctional protein p62 works as a signaling hub in the regulation of pro-survival transcriptional factors NF-κB and Nrf2 and connects autophagy and apoptotic signals, which play important roles in maintaining cell homeostasis. In this review, we discuss the role of p62 in cisplatin resistance by exploring p62-associated signaling pathways based on current studies and our work. Insights into these resistance mechanisms may lead to more effective therapeutic strategies for ovarian cancer by targeting p62.
Collapse
Affiliation(s)
- Xiao-Yu Yan
- 1Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Street, Changchun, 130021 China
| | - Xian-Zhi Qu
- 2Department of Hepatobiliary & Pancreatic Surgery, The Second Hospital of Jilin University, Jilin University, Changchun, 130021 Jilin China
| | - Long Xu
- 1Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Street, Changchun, 130021 China
| | - Si-Hang Yu
- 1Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Street, Changchun, 130021 China
| | - Rui Tian
- 1Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Street, Changchun, 130021 China
| | - Xin-Ru Zhong
- 1Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Street, Changchun, 130021 China
| | - Lian-Kun Sun
- 1Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Street, Changchun, 130021 China
| | - Jing Su
- 1Department of Pathophysiology, Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Street, Changchun, 130021 China
| |
Collapse
|
32
|
Topical Ascorbic Acid Ameliorates Oxidative Stress-Induced Corneal Endothelial Damage via Suppression of Apoptosis and Autophagic Flux Blockage. Cells 2020; 9:cells9040943. [PMID: 32290365 PMCID: PMC7227019 DOI: 10.3390/cells9040943] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 04/09/2020] [Accepted: 04/10/2020] [Indexed: 12/16/2022] Open
Abstract
Compromised pumping function of the corneal endothelium, due to loss of endothelial cells, results in corneal edema and subsequent visual problems. Clinically and experimentally, oxidative stress may cause corneal endothelial decompensation after phacoemulsification. Additionally, in vitro and animal studies have demonstrated the protective effects of intraoperative infusion of ascorbic acid (AA). Here, we established a paraquat-induced cell damage model, in which paraquat induced reactive oxygen species (ROS) production and apoptosis in the B4G12 and ARPE-19 cell lines. We demonstrate that oxidative stress triggered autophagic flux blockage in corneal endothelial cells and that addition of AA ameliorated such oxidative damage. We also demonstrate the downregulation of Akt phosphorylation in response to oxidative stress. Pretreatment with ascorbic acid reduced the downregulation of Akt phosphorylation, while inhibition of the PI3K/Akt pathway attenuated the protective effects of AA. Further, we establish an in vivo rabbit model of corneal endothelial damage, in which an intracameral infusion of paraquat caused corneal opacity. Administration of AA via topical application increased its concentration in the corneal stroma and reduced oxidative stress in the corneal endothelium, thereby promoting corneal clarity. Our findings indicate a perioperative strategy of topical AA administration to prevent oxidative stress-induced damage, particularly for those with vulnerable corneal endothelia.
Collapse
|
33
|
Tao M, Liu T, You Q, Jiang Z. p62 as a therapeutic target for tumor. Eur J Med Chem 2020; 193:112231. [PMID: 32193054 DOI: 10.1016/j.ejmech.2020.112231] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 03/10/2020] [Accepted: 03/10/2020] [Indexed: 12/21/2022]
Abstract
p62/SQSTM1 (hereafter as p62) is a stress-inducible cellular protein, which interacts with various signaling proteins to regulate a variety of cellular functions. Growing lines of evidence supported a critical role of p62 in tumorigenesis, and p62 may become a therapeutic target for tumor. In this review, we summarize biological functions of structural domains of p62, reported bioactive molecules targeting p62, and the relationship between p62 and tumorigenesis.
Collapse
Affiliation(s)
- Mengmin Tao
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing, 210009, China; Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Tian Liu
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing, 210009, China; Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Qidong You
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing, 210009, China; Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China.
| | - Zhengyu Jiang
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing, 210009, China; Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China.
| |
Collapse
|
34
|
Fairlie WD, Tran S, Lee EF. Crosstalk between apoptosis and autophagy signaling pathways. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2020; 352:115-158. [DOI: 10.1016/bs.ircmb.2020.01.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
35
|
Triggering apoptosis by oroxylin A through caspase-8 activation and p62/SQSTM1 proteolysis. Redox Biol 2019; 29:101392. [PMID: 31926620 PMCID: PMC6909190 DOI: 10.1016/j.redox.2019.101392] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 11/13/2019] [Accepted: 11/23/2019] [Indexed: 02/06/2023] Open
Abstract
Emerging evidence suggests that oroxylin A exhibits antitumor effects by inducing cell apoptosis. However, the involved molecular mechanisms have not been elucidated. Here we report that the apoptosis induced by oroxylin A was dependent on p62-mediated activation of caspase-8 in hepatocellular carcinoma cells. Furthermore, oroxylin A also caused p62/SQSTM1 proteolysis at Asp329 by activating caspase-8. Further studies confirm that mutation in p62 (D329H and D329G) was resistant to oroxylin A-mediated p62 cleavage and apoptosis. Due to the absence of the KIR domain that interacts with Keap1, the cleaved p62 reduced the stability of Nrf2, thereby causing oxidative stress and increasing ROS levels. In vivo, p62 similarly contributed to oroxylin A-exerted antitumor effect in xenograft model inoculated SMMC-7721 tumor. In conclusion, our findings indicated that oroxylin A triggered apoptosis through caspase-8 activation and p62/SQSTM1 proteolysis.
Collapse
|
36
|
Al-Alem LF, Baker AT, Pandya UM, Eisenhauer EL, Rueda BR. Understanding and Targeting Apoptotic Pathways in Ovarian Cancer. Cancers (Basel) 2019; 11:cancers11111631. [PMID: 31652965 PMCID: PMC6893837 DOI: 10.3390/cancers11111631] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 10/17/2019] [Accepted: 10/18/2019] [Indexed: 12/11/2022] Open
Abstract
Ovarian cancer cells evade the immune system as well as chemotherapeutic and/or biologic treatments through inherent or acquired mechanisms of survival and drug resistance. Depending on the cell type and the stimuli, this threshold can range from external forces such as blunt trauma to programmed processes such as apoptosis, autophagy, or necroptosis. This review focuses on apoptosis, which is one form of programmed cell death. It highlights the multiple signaling pathways that promote or inhibit apoptosis and reviews current clinical therapies that target apoptotic pathways in ovarian cancer.
Collapse
Affiliation(s)
- Linah F Al-Alem
- Vincent Center for Reproductive Biology, Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, MA 02114, USA.
- Obstetrics and Gynecology, Harvard Medical School, Boston, MA 02115, USA.
| | - Andrew T Baker
- Vincent Center for Reproductive Biology, Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, MA 02114, USA.
- Obstetrics and Gynecology, Harvard Medical School, Boston, MA 02115, USA.
| | - Unnati M Pandya
- Vincent Center for Reproductive Biology, Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, MA 02114, USA.
- Obstetrics and Gynecology, Harvard Medical School, Boston, MA 02115, USA.
| | - Eric L Eisenhauer
- Vincent Center for Reproductive Biology, Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, MA 02114, USA.
- Obstetrics and Gynecology, Harvard Medical School, Boston, MA 02115, USA.
- Gynecology and Oncology Division, Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, MA 02114, USA.
| | - Bo R Rueda
- Vincent Center for Reproductive Biology, Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, MA 02114, USA.
- Obstetrics and Gynecology, Harvard Medical School, Boston, MA 02115, USA.
- Gynecology and Oncology Division, Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, MA 02114, USA.
| |
Collapse
|
37
|
Yan XY, Zhong XR, Yu SH, Zhang LC, Liu YN, Zhang Y, Sun LK, Su J. p62 aggregates mediated Caspase 8 activation is responsible for progression of ovarian cancer. J Cell Mol Med 2019; 23:4030-4042. [PMID: 30941888 PMCID: PMC6533521 DOI: 10.1111/jcmm.14288] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 02/28/2019] [Accepted: 03/02/2019] [Indexed: 12/18/2022] Open
Abstract
Increasing evidence suggests that p62/SQSTM1 functions as a signalling centre in cancer. However, the role of p62 in tumour development depends on the interacting factors it recruits and its precise regulatory mechanism remains unclear. In this study, we investigated the pro‐death signalling recruitment of p62 with the goal of improving anti‐tumour drug effects in ovarian cancer treatment. We found that p62 with Caspase 8 high expression is correlated with longer survival time compared with cases of low Caspase 8 expression in ovarian cancer. In vivo experiments suggested that insoluble p62 and ubiquitinated protein accumulation induced by autophagy impairment promoted the activation of Caspase 8 and increased cell sensitivity to cisplatin. Furthermore, p62 functional domain UBA and LIR mutants regulated autophagic flux and attenuated Caspase 8 activation, which indicates that autophagic degradation is involved in p62‐mediated activation of Caspase 8 in ovarian cancer cells. Collectively, our study demonstrates that p62 promotes Caspase 8 activation through autophagy flux blockage with cisplatin treatment. We have provided evidence that autophagy induction followed by its blockade increases cell sensitivity to chemotherapy which is dependent on p62‐Caspase 8 mediated apoptosis signalling. p62 exhibits pro‐death functions through its interaction with Caspase 8. p62 and Caspase 8 may become novel prognostic biomarkers and oncotargets for ovarian cancer treatment.
Collapse
Affiliation(s)
- Xiao-Yu Yan
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, P.R. China
| | - Xin-Ru Zhong
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, P.R. China
| | - Si-Hang Yu
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, P.R. China
| | - Li-Chao Zhang
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, P.R. China
| | - Ya-Nan Liu
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, P.R. China
| | - Yong Zhang
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, P.R. China
| | - Lian-Kun Sun
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, P.R. China
| | - Jing Su
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, P.R. China
| |
Collapse
|