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Huang YM, Hsu TY, Liu CY, Hsieh YC, Lai KY, Yang YW, Lo KY. Exploring the multifaceted impact of lanthanides on physiological pathways in human breast cancer cells. Toxicology 2024; 502:153731. [PMID: 38253231 DOI: 10.1016/j.tox.2024.153731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 01/09/2024] [Accepted: 01/17/2024] [Indexed: 01/24/2024]
Abstract
Lanthanum (La) and cerium (Ce), rare earth elements with physical properties similar to calcium (Ca), are generally considered non-toxic when used appropriately. However, their ions possess anti-tumor capabilities. This investigation explores the potential applications and mechanisms of LaCl3 or CeCl3 treatment in triple-negative breast cancer (TNBC) cell lines. TNBC, characterized by the absence of estrogen receptor (ERα), progesterone receptor (PR), and human epidermal growth factor receptor 2 (HER-2) expression, is prone to early metastasis and resistant to hormone therapy. Our results demonstrate that La/Ce treatment reduces cell growth, and when combined with cisplatin, it synergistically inhibits cell growth and the PI3K/AKT pathway. La and Ce induce oxidative stress by disrupting mitochondrial function, leading to protein oxidation. Additionally, they interfere with protein homeostasis and induce nucleolar stress. Furthermore, disturbance in F-actin web formation impairs cell migration. This study delves into the mechanism by which calcium-like elements La and Ce inhibit breast cancer cell growth, shedding light on their interference in mitochondrial function, protein homeostasis, and cytoskeleton assembly.
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Affiliation(s)
- Yi-Ming Huang
- Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan, ROC
| | - Tsu-Yu Hsu
- Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan, ROC
| | - Ching-Yu Liu
- Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan, ROC
| | - Yu-Chen Hsieh
- Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan, ROC
| | - Kuan-Yun Lai
- Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan, ROC
| | - Ya-Wen Yang
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan, ROC.
| | - Kai-Yin Lo
- Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan, ROC.
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Yang X, Liu Z, Tang W, Pratap UP, Collier AB, Altwegg KA, Gopalam R, Li X, Yuan Y, Zhou D, Lai Z, Chen Y, Sareddy GR, Valente PT, Kost ER, Viswanadhapalli S, Vadlamudi RK. PELP1 inhibition by SMIP34 reduces endometrial cancer progression via attenuation of ribosomal biogenesis. Mol Oncol 2023. [PMID: 37853941 DOI: 10.1002/1878-0261.13539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 08/31/2023] [Accepted: 09/04/2023] [Indexed: 10/20/2023] Open
Abstract
Endometrial carcinoma (ECa) is the fourth most common cancer among women. The oncogene PELP1 is frequently overexpressed in a variety of cancers, including ECa. We recently generated SMIP34, a small-molecule inhibitor of PELP1 that suppresses PELP1 oncogenic signaling. In this study, we assessed the effectiveness of SMIP34 in treating ECa. Treatment of established and primary patient-derived ECa cells with SMIP34 resulted in a significant reduction of cell viability, colony formation ability, and induction of apoptosis. RNA-seq analyses showed that SMIP34-regulated genes were negatively correlated with ribosome biogenesis and eukaryotic translation pathways. Mechanistic studies showed that the Rix complex, which is essential for ribosomal biogenesis, is disrupted upon SMIP34 binding to PELP1. Biochemical assays confirmed that SMIP34 reduced ribosomal biogenesis and new protein synthesis. Further, SMIP34 enhanced the efficacy of mTOR inhibitors in reducing viability of ECa cells. SMIP34 is also effective in reducing cell viability in ECa organoids in vitro and explants ex vivo. Importantly, SMIP34 treatment resulted in a significant reduction of the growth of ECa xenografts. Collectively, these findings underscore the potential of SMIP34 in treating ECa.
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Affiliation(s)
- Xue Yang
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
- Department of Obstetrics and Gynecology, Second Xiangya Hospital, Central South University, Changsha, China
| | - Zexuan Liu
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
- Department of Oncology, Xiangya Hospital, Central South University, Changsha, China
| | - Weiwei Tang
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
- Department of Obstetrics and Gynecology, Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, China
| | - Uday P Pratap
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
| | - Alexia B Collier
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
| | - Kristin A Altwegg
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
- Mays Cancer Center, University of Texas Health San Antonio, TX, USA
| | - Rahul Gopalam
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
| | - Xiaonan Li
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
| | - Yaxia Yuan
- Department of Biochemistry & Structural Biology, University of Texas Health San Antonio, TX, USA
| | - Daohong Zhou
- Department of Biochemistry & Structural Biology, University of Texas Health San Antonio, TX, USA
| | - Zhao Lai
- Department of Molecular Medicine, Department of Population Sciences, and Greehey Children's Cancer Research Institute, University of Texas Health San Antonio, San Antonio, TX, USA
| | - Yidong Chen
- Department of Molecular Medicine, Department of Population Sciences, and Greehey Children's Cancer Research Institute, University of Texas Health San Antonio, San Antonio, TX, USA
| | - Gangadhara R Sareddy
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
- Mays Cancer Center, University of Texas Health San Antonio, TX, USA
| | - Philip T Valente
- Department of Pathology, University of Texas Health San Antonio, TX, USA
| | - Edward R Kost
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
| | - Suryavathi Viswanadhapalli
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
- Mays Cancer Center, University of Texas Health San Antonio, TX, USA
| | - Ratna K Vadlamudi
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, TX, USA
- Mays Cancer Center, University of Texas Health San Antonio, TX, USA
- Audie L. Murphy Division, South Texas Veterans Health Care System, San Antonio, TX, USA
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Altwegg KA, Pratap UP, Liu Z, Liu J, Sanchez JR, Yang X, Ebrahimi B, Panneerdoss DM, Li X, Sareddy GR, Viswanadhapalli S, Rao MK, Vadlamudi RK. Targeting PELP1 oncogenic signaling in TNBC with the small molecule inhibitor SMIP34. Breast Cancer Res Treat 2023; 200:151-162. [PMID: 37199805 PMCID: PMC10224866 DOI: 10.1007/s10549-023-06958-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 04/21/2023] [Indexed: 05/19/2023]
Abstract
PURPOSE Triple-negative breast cancer (TNBC) is the most aggressive subtype of breast cancer. Oncogenic PELP1 is frequently overexpressed in TNBC, and it has been demonstrated that PELP1 signaling is essential for TNBC progression. The therapeutic utility of targeting PELP1 in TNBC, however, remains unknown. In this study, we investigated the effectiveness of SMIP34, a recently developed PELP1 inhibitor for the treatment of TNBC. METHODS To ascertain the impact of SMIP34 treatment, we used seven different TNBC models for testing cell viability, colony formation, invasion, apoptosis, and cell cycle analysis. Western blotting and RT-qPCR were used to determine the mechanistic insights of SMIP34 action. Using xenograft and PDX tumors, the ability of SMIP34 in suppressing proliferation was examined both ex vivo and in vivo. RESULTS TNBC cells' viability, colony formation, and invasiveness were all decreased by SMIP34 in in vitro cell-based assays, while apoptosis was increased. SMIP34 treatment promoted the degradation of PELP1 through the proteasome pathway. RT-qPCR analyses confirmed that SMIP34 treatment downregulated PELP1 target genes. Further, SMIP34 treatment substantially downregulated PELP1 mediated extranuclear signaling including ERK, mTOR, S6 and 4EBP1. Mechanistic studies confirmed downregulation of PELP1 mediated ribosomal biogenesis functions including downregulation of cMyc and Rix complex proteins LAS1L, TEX-10, and SENP3. The proliferation of TNBC tumor tissues was decreased in explant experiments by SMIP34. Additionally, SMIP34 treatment markedly decreased tumor progression in both TNBC xenograft and PDX models. CONCLUSIONS Together, these findings from in vitro, ex vivo, and in vivo models show that SMIP34 may be a useful therapeutic agent for inhibiting PELP1 signaling in TNBC.
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Affiliation(s)
- Kristin A Altwegg
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
- Mays Cancer Center, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Uday P Pratap
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Zexuan Liu
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
- Department of Oncology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, People's Republic of China
| | - Junhao Liu
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
- Department of Oncology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, People's Republic of China
| | - John R Sanchez
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Xue Yang
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
- Department of Obstetrics and Gynecology, Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, People's Republic of China
| | - Behnam Ebrahimi
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
- Mays Cancer Center, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Durga Meenakshi Panneerdoss
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Xiaonan Li
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Gangadhara R Sareddy
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
- Mays Cancer Center, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Suryavathi Viswanadhapalli
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
- Mays Cancer Center, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Manjeet K Rao
- Greehey Children's Cancer Research Institute, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
- Mays Cancer Center, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Ratna K Vadlamudi
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX, 78229, USA.
- Mays Cancer Center, University of Texas Health San Antonio, San Antonio, TX, 78229, USA.
- Audie L. Murphy Division, South Texas Veterans Health Care System, San Antonio, TX, 78229, USA.
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Cryo-EM reveals the architecture of the PELP1-WDR18 molecular scaffold. Nat Commun 2022; 13:6783. [PMID: 36351913 PMCID: PMC9646879 DOI: 10.1038/s41467-022-34610-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 10/31/2022] [Indexed: 11/11/2022] Open
Abstract
PELP1 (Proline-, Glutamic acid-, Leucine-rich protein 1) is a large scaffolding protein that functions in many cellular pathways including steroid receptor (SR) coactivation, heterochromatin maintenance, and ribosome biogenesis. PELP1 is a proto-oncogene whose expression is upregulated in many human cancers, but how the PELP1 scaffold coordinates its diverse cellular functions is poorly understood. Here we show that PELP1 serves as the central scaffold for the human Rix1 complex whose members include WDR18, TEX10, and SENP3. We reconstitute the mammalian Rix1 complex and identified a stable sub-complex comprised of the conserved PELP1 Rix1 domain and WDR18. We determine a 2.7 Å cryo-EM structure of the subcomplex revealing an interconnected tetrameric assembly and the architecture of PELP1's signaling motifs, including eleven LxxLL motifs previously implicated in SR signaling and coactivation of Estrogen Receptor alpha (ERα) mediated transcription. However, the structure shows that none of these motifs is in a conformation that would support SR binding. Together this work establishes that PELP1 scaffolds the Rix1 complex, and association with WDR18 may direct PELP1's activity away from SR coactivation.
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