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Alimohammadi M, Rahimzadeh P, Khorrami R, Bonyadi M, Daneshi S, Nabavi N, Raesi R, Farani MR, Dehkhoda F, Taheriazam A, Hashemi M. A comprehensive review of the PTEN/PI3K/Akt axis in multiple myeloma: From molecular interactions to potential therapeutic targets. Pathol Res Pract 2024; 260:155401. [PMID: 38936094 DOI: 10.1016/j.prp.2024.155401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 06/02/2024] [Accepted: 06/09/2024] [Indexed: 06/29/2024]
Abstract
Phosphatase and tensin homolog (PTEN), phosphatidylinositol 3-kinase (PI3K), and protein kinase B (Akt) signaling pathways contribute to the development of several cancers, including multiple myeloma (MM). PTEN is a tumor suppressor that influences the PI3K/Akt/mTOR pathway, which in turn impacts vital cellular processes like growth, survival, and treatment resistance. The current study aims to present the role of PTEN and PI3K/Akt/mTOR signaling in the development of MM and its response to treatment. In addition, the molecular interactions in MM that underpin the PI3K/Akt/mTOR pathway and address potential implications for the development of successful treatment plans are also discussed in detail. We investigate their relationship to both upstream and downstream regulators, highlighting new developments in combined therapies that target the PTEN/PI3K/Akt axis to overcome drug resistance, including the use of PI3K and mitogen-activated protein kinase (MAPK) inhibitors. We also emphasize that PTEN/PI3K/Akt pathway elements may be used in MM diagnosis, prognosis, and therapeutic targets.
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Affiliation(s)
- Mina Alimohammadi
- Department of Immunology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran.
| | - Payman Rahimzadeh
- Surgical Research Society (SRS), Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Ramin Khorrami
- Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, University of Tehran, Tehran, Islamic Republic of Iran
| | - Mojtaba Bonyadi
- Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, University of Tehran, Tehran, Islamic Republic of Iran
| | - Salman Daneshi
- Department of Public Health, School of Health, Jiroft University of Medical Sciences, Jiroft, Islamic Republic of Iran
| | - Noushin Nabavi
- Independent Researcher, Victoria, British Columbia V8V 1P7, Canada
| | - Rasoul Raesi
- Department of Health Services Management, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran; Department of Nursing, Torbat Jam Faculty of Medical Sciences, Torbat Jam, Iran
| | - Marzieh Ramezani Farani
- NanoBio High-Tech Materials Research Center, Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Incheon 22212, Republic of Korea
| | - Farshid Dehkhoda
- Department of Orthopedics, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran.
| | - Afshin Taheriazam
- Farhikhtegan Medical Convergence Sciences Research Center, Farhikhtegan Hospital Tehran Medical Sciences, Islamic Azad University, Tehran, Islamic Republic of Iran; Department of Orthopedics, Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Islamic Republic of Iran.
| | - Mehrdad Hashemi
- Farhikhtegan Medical Convergence Sciences Research Center, Farhikhtegan Hospital Tehran Medical Sciences, Islamic Azad University, Tehran, Islamic Republic of Iran; Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Islamic Republic of Iran.
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Sarkar A, Paul A, Banerjee T, Maji A, Saha S, Bishayee A, Maity TK. Therapeutic advancements in targeting BCL-2 family proteins by epigenetic regulators, natural, and synthetic agents in cancer. Eur J Pharmacol 2023; 944:175588. [PMID: 36791843 DOI: 10.1016/j.ejphar.2023.175588] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 01/21/2023] [Accepted: 02/08/2023] [Indexed: 02/17/2023]
Abstract
Cancer is amongst the deadliest and most disruptive disorders, having a much higher death rate than other diseases worldwide. Human cancer rates continue to rise, thereby posing the most significant concerns for medical health professionals. In the last two decades, researchers have gone past several milestones in tackling cancer while gaining insight into the role of apoptosis in cancer or targeting various biomarker tools for prognosis and diagnosis. Apoptosis which is still a topic full of complexities, can be controlled considerably by B-cell lymphoma 2 (BCL-2) and its family members. Therefore, targeting proteins of this family to prevent tumorigenesis, is essential to focus on the pharmacological features of the anti-apoptotic and pro-apoptotic members, which will help to develop and manage this disorder. This review deals with the advancements of various epigenetic regulators to target BCL-2 family proteins, including the mechanism of several microRNAs (miRNAs) and long non-coding RNAs (lncRNAs). Similarly, a rise in natural and synthetic molecules' research over the last two decades has allowed us to acquire insights into understanding and managing the transcriptional alterations that have led to apoptosis and treating various neoplastic diseases. Furthermore, several inhibitors targeting anti-apoptotic proteins and inducers or activators targeting pro-apoptotic proteins in preclinical and clinical stages have been summarized. Overall, agonistic and antagonistic mechanisms of BCL-2 family proteins conciliated by epigenetic regulators, natural and synthetic agents have proven to be an excellent choice in developing cancer therapeutics.
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Affiliation(s)
- Arnab Sarkar
- Department of Pharmaceutical Technology, Jadavpur University, West Bengal, Kolkata, 700032, India.
| | - Abhik Paul
- Department of Pharmaceutical Technology, Jadavpur University, West Bengal, Kolkata, 700032, India.
| | - Tanmoy Banerjee
- Department of Pharmaceutical Technology, Jadavpur University, West Bengal, Kolkata, 700032, India.
| | - Avik Maji
- Department of Pharmaceutical Technology, Jadavpur University, West Bengal, Kolkata, 700032, India.
| | - Sanjukta Saha
- Department of Pharmaceutical Technology, Jadavpur University, West Bengal, Kolkata, 700032, India.
| | - Anupam Bishayee
- College of Osteopathic Medicine, Lake Erie College of Osteopathic Medicine, Bradenton, FL, 34211, USA.
| | - Tapan Kumar Maity
- Department of Pharmaceutical Technology, Jadavpur University, West Bengal, Kolkata, 700032, India.
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Chen P, Wu S, Dong X, Zhou M, Xu P, Chen B. Formosanin C induces autophagy-mediated apoptosis in multiple myeloma cells through the PI3K/AKT/mTOR signaling pathway. HEMATOLOGY (AMSTERDAM, NETHERLANDS) 2022; 27:977-986. [PMID: 36053135 DOI: 10.1080/16078454.2022.2117126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVES Multiple myeloma (MM) is an incurable plasma cell malignancy associated with poor survival. Novel therapeutic drugs are urgently needed to improve MM therapy and patient outcomes. This study aimed to investigate the effect of formosanin C (FC), a Chinese medicine monomer, on MM in vitro and disclose the underlying molecular mechanism. METHODS The effect of FC on the viability, proliferation, apoptosis, and autophagy of MM cell lines (NCI-H929 and ARP1) was studied through CCK-8, colony formation, flow cytometry, GFP-LC3, and western blotting assays, respectively. A pharmacological approach and network pharmacology technology were implemented to explore the potential mechanisms of the action of FC on MM cells. RESULTS FC efficiently suppressed the viability and colony-forming capacity, but promoted the number of autophagic vacuoles with GFP-LC3 localization and the percentage of apoptotic cells in MM cells. Additionally, FC significantly increased the levels of the autophagy-related proteins LC3-Ⅱ and Beclin 1, as well as the apoptosis-related proteins Bax and cleaved caspase-3, but blocked the expression of the proapoptotic protein Bcl-2 in the cells; these effects were reversed by an inhibitor of autophagy, 3-methyladenine. What's more, we found that the phosphoinositide 3-kinase (PI3K)/protein kinase B (AKT)/mammalian target of rapamycin (mTOR) signaling pathway was involved in the FC-mediated inhibition of MM. Pharmacological inhibition of this pathway dramatically relieved FC-triggered excessive expression of autophagy-related proteins and rescued MM cells from FC-induced apoptosis. CONCLUSION Our findings indicate that FC exhibits an anti-MM effect by activating cell autophagy through the PI3K/AKT/mTOR signaling pathway.
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Affiliation(s)
- Ping Chen
- Department of Hematology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, People's Republic of China.,Department of Hematology, Nanjing Hospital of Chinese Medicine, Nanjing, People's Republic of China
| | - Sungui Wu
- Department of Hematology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, People's Republic of China
| | - Xiaoqing Dong
- Department of Hematology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, People's Republic of China
| | - Min Zhou
- Department of Hematology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, People's Republic of China
| | - Peipei Xu
- Department of Hematology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, People's Republic of China
| | - Bing Chen
- Department of Hematology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, People's Republic of China
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Mehdizadeh M, Farhadihosseinabadi B, Nikoonezhad M, Sankanian G, Soleimani M, Sayad A. Phosphatidylinositol 3-kinase signaling inhibitors for treatment of multiple myeloma: From small molecules to microRNAs. J Oncol Pharm Pract 2021; 28:149-158. [PMID: 34612744 DOI: 10.1177/10781552211035369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Multiple myeloma is one of the most hard-to-treat cancers among blood malignancies due to the high rate of drug resistance and relapse. The researchers are trying to find more effective drugs for treatment of the disease. Hence, the use of drugs targeting signaling pathways has become a powerful weapon. Overactivation of phosphatidylinositol 3-kinase signaling pathways is frequently observed in multiple myeloma cancer cells, which increases survival, proliferation, and even drug resistance in such cells. In recent years, drugs that inhibit the mediators involved in this biological pathway have shown promising results in the treatment of multiple myeloma. In the present study, we aimed to introduce phosphatidylinositol 3-kinase signaling inhibitors which include small molecules, herbal compounds, and microRNAs.
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Affiliation(s)
- Mahshid Mehdizadeh
- Hematopoietic Stem Cell Research Center, 556492Shahid Beheshti University of Medical Sciences, Iran
| | | | - Maryam Nikoonezhad
- Hematopoietic Stem Cell Research Center, 556492Shahid Beheshti University of Medical Sciences, Iran
| | - Ghazaleh Sankanian
- Hematopoietic Stem Cell Research Center, 556492Shahid Beheshti University of Medical Sciences, Iran
| | - Masoud Soleimani
- Hematopoietic Stem Cell Research Center, 556492Shahid Beheshti University of Medical Sciences, Iran
| | - Arezou Sayad
- Hematopoietic Stem Cell Research Center, 556492Shahid Beheshti University of Medical Sciences, Iran
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Jöhrer K, Ҫiҫek SS. Multiple Myeloma Inhibitory Activity of Plant Natural Products. Cancers (Basel) 2021; 13:2678. [PMID: 34072312 PMCID: PMC8198565 DOI: 10.3390/cancers13112678] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/25/2021] [Accepted: 05/26/2021] [Indexed: 12/23/2022] Open
Abstract
A literature search on plant natural products with antimyeloma activity until the end of 2020 resulted in 92 compounds with effects on at least one human myeloma cell line. Compounds were divided in different compound classes and both their structure-activity-relationships as well as eventual correlations with the pathways described for Multiple Myeloma were discussed. Each of the major compound classes in this review (alkaloids, phenolics, terpenes) revealed interesting candidates, such as dioncophyllines, a group of naphtylisoquinoline alkaloids, which showed pronounced and selective induction of apoptosis when substituted in position 7 of the isoquinoline moiety. Interestingly, out of the phenolic compound class, two of the most noteworthy constituents belong to the relatively small subclass of xanthones, rendering this group a good starting point for possible further drug development. The class of terpenoids also provides noteworthy constituents, such as the highly oxygenated diterpenoid oridonin, which exhibited antiproliferative effects equal to those of bortezomib on RPMI8226 cells. Moreover, triterpenoids containing a lactone ring and/or quinone-like substructures, e.g., bruceantin, whitaferin A, withanolide F, celastrol, and pristimerin, displayed remarkable activity, with the latter two compounds acting as inhibitors of both NF-κB and proteasome chymotrypsin-like activity.
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Affiliation(s)
- Karin Jöhrer
- Tyrolean Cancer Research Institute, Innrain 66, 6020 Innsbruck, Austria;
| | - Serhat Sezai Ҫiҫek
- Department of Pharmaceutical Biology, Kiel University, Gutenbergstraße 76, 24118 Kiel, Germany
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Xu R, Zhang Y, Li A, Ma Y, Cai W, Song L, Xie Y, Zhou S, Cao W, Tang X. LY‑294002 enhances the chemosensitivity of liver cancer to oxaliplatin by blocking the PI3K/AKT/HIF‑1α pathway. Mol Med Rep 2021; 24:508. [PMID: 33982772 PMCID: PMC8134878 DOI: 10.3892/mmr.2021.12147] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 04/12/2021] [Indexed: 02/07/2023] Open
Abstract
Liver cancer remains one of the leading causes of cancer deaths worldwide. The therapeutic effect of oxaliplatin on liver cancer is often limited by acquired resistance of the cancer cells. Abnormal activation of the PI3K/AKT pathway plays an important role in the acquired resistance of oxaliplatin. The present study investigated the effects of the PI3K inhibitor LY-294002 and AKT inhibitor MK2206 on the chemosensitivity of oxaliplatin-resistant liver cancer cells and the molecular mechanism involved. An oxaliplatin-resistant liver cancer cell line HepG2R was developed. MTT assay, clone formation experiments, flow cytometry and Annexin V-FITC/PI staining were used to determine the proliferation, cycle and apoptosis of HepG2R cells when oxaliplatin was combined with LY-294002 or MK2206 treatment. The effects of LY-294002 and MK-2206 on the abnormal activation of PI3K/AKT pathway and hypoxia inducible factor (HIF)-1α protein level in HepG2R cells were detected using western blotting. The results indicated that the PI3K/AKT pathway is stably activated in HepG2R cells. Compared with the AKT inhibitor MK2206, the PI3K inhibitor LY-294002 more effectively downregulated the phosphorylation levels of p85, p110α, p110β, p110γ and AKT in the PI3K/AKT pathway in HepG2R cells, and more effectively inhibited the proliferation of the cells. LY-294002 enhanced the chemotherapy sensitivity of HepG2R cells to oxaliplatin by inducing G0/G1 phase arrest and increasing the proportion of apoptotic cells. In addition, LY-294002 reduced the level of HIF-1α, which is highly expressed in HepG2R cells. It was concluded that LY-294002 enhanced the chemosensitivity of liver cancer cells to oxaliplatin by inhibiting the PI3K/AKT signaling pathway, which may be related to the inhibition of HIF-1α expression. These findings may have clinical significance for the treatment of oxaliplatin-resistant liver cancer.
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Affiliation(s)
- Ruyue Xu
- Medical School, Anhui University of Science and Technology, Huainan, Anhui 232001, P.R. China
| | - Yinci Zhang
- Medical School, Anhui University of Science and Technology, Huainan, Anhui 232001, P.R. China
| | - Amin Li
- Medical School, Anhui University of Science and Technology, Huainan, Anhui 232001, P.R. China
| | - Yongfang Ma
- Medical School, Anhui University of Science and Technology, Huainan, Anhui 232001, P.R. China
| | - Wenpeng Cai
- Medical School, Anhui University of Science and Technology, Huainan, Anhui 232001, P.R. China
| | - Li Song
- Medical School, Anhui University of Science and Technology, Huainan, Anhui 232001, P.R. China
| | - Yinghai Xie
- Institute of Environmentally Friendly Materials and Occupational Health, Anhui University of Science and Technology, Wuhu, Anhui 241000, P.R. China
| | - Shuping Zhou
- Institute of Environmentally Friendly Materials and Occupational Health, Anhui University of Science and Technology, Wuhu, Anhui 241000, P.R. China
| | - Weiya Cao
- Medical School, Anhui University of Science and Technology, Huainan, Anhui 232001, P.R. China
| | - Xiaolong Tang
- Medical School, Anhui University of Science and Technology, Huainan, Anhui 232001, P.R. China
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Liu F, Deng W, Wan Z, Xu D, Chen J, Yang X, Xu J. lncRNA MAGI2-AS3 overexpression had antitumor effect on Hepatic cancer via miRNA-23a-3p/PTEN axis. Food Sci Nutr 2021; 9:2517-2530. [PMID: 34026068 PMCID: PMC8116851 DOI: 10.1002/fsn3.2199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/02/2021] [Accepted: 02/06/2021] [Indexed: 11/16/2022] Open
Abstract
The present study aimed to evaluate the antitumor effects of MAGI2-AS3 and its mechanism in liver cancer. Cancer tissues and adjacent nontumor tissues were collected, and lncRNAs were analyzed via chip assay. The correlation between MAGEI2-AS3 and patient pathology and prognosis was then analyzed. Bel-7402 and Huh-7 cell lines were also used in our study. For the in vitro study, MTT assay, flow cytometry, transwell assay, and wound healing assay were conducted to evaluate hepatic cancer cell (Bel-7402 and Huh-7) proliferation, apoptosis, invasion, and migration. The relative mechanisms were evaluated by Western blot (WB) and cellular immunofluorescence. The correlation among MAGI2-AS3, miRNA-23a-3p, and PTEN was determined by a dual-luciferase reporter assay. The expression of lncRNA MAGI2-AS3 was significantly downregulated in tumor tissues. MAGI2-AS3 expression was closely correlation with HCC patient's clinicopathology and prognosis and prognosis. In the cell experiment, compared with the negative control (NC) group, MAGI2-AS3 overexpression reduced cell proliferation, invasion, and migration and increased cell apoptosis in Bel-7402 and Huh-7 cell lines. However, when Bel-7402 and Huh-7 cells were transfected with miRNA-23a-3p, their biological activities (proliferation, invasion, and migration) were significantly increased. Through WB assay, MAGI2-AS3 could increase PTEN and depress p-AKT and MMP-9 protein expressions via miRNA-23a-3p suppression. The dual-luciferase reporter assay revealed that MAGI2-AS3 directly targeted miRNA-23a-3p and that miRNA-23a-3p could target PTEN. MAGI2-AS3 might be a potential therapeutic target for liver cancer owing to its regulation by the miRNA-23a-3p/PTEN axis.
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Affiliation(s)
- Fei Liu
- Jiangxi Province Hospital of Integrated Chinese and Western MedicineNanchangChina
| | - Wenwen Deng
- Jiangxi Province Hospital of Integrated Chinese and Western MedicineNanchangChina
| | - Zhenda Wan
- Jiangxi Province Hospital of Integrated Chinese and Western MedicineNanchangChina
| | - Dajin Xu
- Jiangxi Province Hospital of Integrated Chinese and Western MedicineNanchangChina
| | - Jun Chen
- Jiangxi Province Hospital of Integrated Chinese and Western MedicineNanchangChina
| | - Xin Yang
- Jiangxi Province Hospital of Integrated Chinese and Western MedicineNanchangChina
| | - Jianhua Xu
- Jiangxi Province Hospital of Integrated Chinese and Western MedicineNanchangChina
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Lu D, Sun L, Li Z, Mu Z. lncRNA EZR‑AS1 knockdown represses proliferation, migration and invasion of cSCC via the PI3K/AKT signaling pathway. Mol Med Rep 2020; 23:76. [PMID: 33236153 PMCID: PMC7716411 DOI: 10.3892/mmr.2020.11714] [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: 06/18/2020] [Accepted: 10/21/2020] [Indexed: 02/07/2023] Open
Abstract
Although long non-coding RNAs (lncRNAs) have been implicated in various human cancer types, the role of lncRNA ezrin antisense RNA 1 (EZR-AS1) in cutaneous squamous cell carcinoma (cSCC) remains unclear. The present study aimed to investigate the effect of lncRNAEZR-AS1 on cSCC and identify the underlying molecular mechanisms. EZR-AS1 expression was measured in cSCC tissue and cells detected using reverse transcription-quantitative PCR. Gain-of-function assays were performed in A431 cells, which have a relatively low expression of EZR-AS1, while loss-of-function assays were performed in SCC13 and SCL-1 colon cancer cells, which have a relatively high expression of EZR-AS1. Cell viability, proliferation, migration, invasion and apoptosis were assessed using MTT, plate cloning, wound healing, Transwell and flow cytometry assays, respectively. EZR-AS1 mRNA expression levels were significantly upregulated in cSCC tissues and cells compared with adjacent healthy tissues and HaCaT cells, respectively. Compared with the small interfering RNA (si)-negative control (NC) group, si-EZR-AS1 significantly inhibited SCC13 and SCL-1 cell proliferation, migration and invasion, but promoted cell apoptosis. By contrast, compared with the pc-NC group, EZR-AS1 overexpression significantly enhanced A431 cell proliferation, migration and invasion, but inhibited cell apoptosis. Moreover, focal adhesion kinase (FAK) was identified as a target of EZR-AS1, and EZR-AS1 knockdown significantly decreased FAK expression compared with the si-NC group. Moreover, EZR-AS1 knockdown significantly downregulated the protein expression levels of phosphorylated (p)-PI3K/PI3K and p-AKT/AKT in cSCC cells compared with the si-NC group. The PI3K agonist 740Y-P significantly reversed si-EZR-AS1-mediated effects on SCC13 and SCL-1 cell proliferation, migration, invasion and apoptosis. In conclusion, the present study demonstrated that si-EZR-AS1 inhibited cSCC cell proliferation, migration and invasion, and promoted cell apoptosis, potentially via regulating the PI3K/AKT signaling pathway. Therefore, the present study provided novel insights into the diagnosis and treatment of cSCC.
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Affiliation(s)
- Di Lu
- Department of Dermatology, Zibo First Hospital, Zibo, Shandong 255200, P.R. China
| | - Lingling Sun
- Department of Oncology, Zibo First Hospital, Zibo, Shandong 255200, P.R. China
| | - Zhengjun Li
- Department of Dermatology, Qilu Hospital of Shandong University, Ji'nan, Shandong 250012, P.R. China
| | - Zhen Mu
- Department of Dermatology, The Second Affiliated Hospital of Shandong First Medical University, Tai'an, Shandong 271000, P.R. China
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Zhong X, Song Z, Song X. Survival motor neuron protein protects H9c2 cardiomyocytes from hypoxia-induced cell injury by reducing apoptosis. Clin Exp Pharmacol Physiol 2020; 47:1808-1815. [PMID: 32603518 DOI: 10.1111/1440-1681.13369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 06/10/2020] [Accepted: 06/19/2020] [Indexed: 12/01/2022]
Abstract
BACKGROUND Hypoxia induces cell injury in cardiomyocytes and leads to the development of cardiovascular diseases. The survival motor neuron protein (SMN) is a crucial ubiquitous protein whose functional deficiency causes motor neuron loss seen in spinal muscular atrophy. SMN has shown protective effects on the cardiovascular system and the aim of the present study was to investigate the cardioprotective effects of SMN on hypoxia-induced cell injury. METHODS Cobalt chloride (CoCl2 ) was used to induce chemical hypoxia in H9c2 cardiomyocytes. Cell proliferation was determined by the MTT assay and the mRNA levels of SMN were evaluated by real-time polymerase chain reaction. The protein expression levels of SMN, hypoxia-inducible transcription factor 1α (HIF-1α), and apoptosis-related proteins, such as cytochrome c (Cyt c), B cell lymphoma-2 (Bcl-2), Bcl-2 associated X protein (Bax), and cleaved caspase-3 were evaluated by western blot analysis. Cell apoptosis was analysed using annexin V/propidium iodide (PI) staining. RESULTS Treatment with CoCl2 significantly reduced H9c2 cell viability; the level of HIF-1α, which is a hypoxia-related indicator increased whereas the expression of SMN protein decreased. Hypoxia also induced cardiomyocyte apoptosis, indicated by reduced Bcl-2 expression and elevated cleaved caspase-3, Bax, and cytochrome c levels. Interestingly, SMN, which is a neuron protection factor, ameliorated CoCl2 -induced cell damage by reducing cardiomyocyte apoptosis through upregulation of Bcl-2 and inhibition of cytochrome c, cleaved caspase-3, and Bax expression. CONCLUSION Survival motor neuron prevents hypoxia-induced cell apoptosis through inhibition of the mitochondrial apoptotic pathway, and thereby exerts a protective effect on H9c2 cardiomyocytes.
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Affiliation(s)
- Xiao Zhong
- Department of Cardiovascular Center, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, China
| | - Ziguang Song
- Department of Cardiovascular Center, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, China
| | - Xiang Song
- Department of Cardiovascular Center, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, China
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Characterization of a PERK Kinase Inhibitor with Anti-Myeloma Activity. Cancers (Basel) 2020; 12:cancers12102864. [PMID: 33028016 PMCID: PMC7601861 DOI: 10.3390/cancers12102864] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 09/21/2020] [Accepted: 10/01/2020] [Indexed: 02/07/2023] Open
Abstract
Due to increased immunoglobulin production and uncontrolled proliferation, multiple myeloma (MM) plasma cells develop a phenotype of deregulated unfolded protein response (UPR). The eIF2-alpha kinase 3 [EIF2αK3, protein kinase R (PKR)-like ER kinase (PERK)], the third known sensor of endoplasmic reticulum (ER) stress, is a serine-threonine kinase and, like the other two UPR-related proteins, i.e., IRE1 and ATF6, it is bound to the ER membrane. MM, like other tumors showing uncontrolled protein secretion, is highly dependent to UPR for survival; thus, inhibition of PERK can be an effective strategy to suppress growth of malignant plasma cells. Here, we have used GSK2606414, an ATP-competitive potent PERK inhibitor, and found significant anti-proliferative and apoptotic effects in a panel of MM cell lines. These effects were accompanied by the downregulation of key components of the PERK pathway as well as of other UPR elements. Consistently, PERK gene expression silencing significantly increased cell death in MM cells, highlighting the importance of PERK signaling in MM biology. Moreover, GSK2606414, in combination with the proteasome inhibitor bortezomib, exerted an additive toxic effect in MM cells. Overall, our data suggest that PERK inhibition could represent a novel combinatorial therapeutic approach in MM.
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