1
|
Yang Y, Qin H, Ding M, Ji C, Chen W, Diao W, Yin H, Chen M, Gan W, Guo H. Small ankyrin 1 (sANK1) promotes docetaxel resistance in castration-resistant prostate cancer cells by enhancing oxidative phosphorylation. FEBS Open Bio 2022; 13:257-269. [PMID: 36508323 PMCID: PMC9900087 DOI: 10.1002/2211-5463.13535] [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: 07/08/2022] [Revised: 11/09/2022] [Accepted: 12/11/2022] [Indexed: 12/14/2022] Open
Abstract
Docetaxel (DTX) plays an important role in treating advanced prostate cancer (PCa). However, nearly all patients receiving DTX therapy ultimately progress to DTX resistance. How to address DTX resistance in PCa remains a key challenge for all urologists. Small ankyrin 1 (sAnk1) is an integral membrane protein in the endoplasmic reticulum. In the present study, we identified that sAnk1 is upregulated in PCa tissues and is positively associated with DTX therapy resistance in PCa. Further investigation demonstrated that overexpression of sAnk1 can significantly increase the DTX-resistant ability of PCa cells in vitro and in vivo. In addition, overexpression of sAnk1 could enhance oxidative phosphorylation (OXPHOS) levels in PCa cells, which was consistent with the higher OXPHOS levels observed in DTX-resistant PCa cells as compared to DTX-sensitive PCa cells. sAnk1 was also found to interact with polypyrimidine-tract-binding protein (PTBP1), an alternative splicing factor, and suppressed PTBP1-mediated alternative splicing of the pyruvate kinase gene (PKM). Thus, overexpression of sAnk1 decreased the ratio of PKM2/PKM1, enhanced the OXPHOS level, and ultimately promoted the resistance of PCa cells to DTX. In summary, our data suggest that sAnk1 enhances DTX resistance in PCa cells.
Collapse
Affiliation(s)
- Yang Yang
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| | - Haixiang Qin
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| | - Meng Ding
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| | - Changwei Ji
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| | - Wei Chen
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| | - Wenli Diao
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| | - Haoli Yin
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| | - Mengxia Chen
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| | - Weidong Gan
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| | - Hongqian Guo
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of UrologyNanjing UniversityChina
| |
Collapse
|
2
|
Subramaniam J, Yamankurt G, Cunha SR. Obscurin regulates ankyrin macromolecular complex formation. J Mol Cell Cardiol 2022; 168:44-57. [PMID: 35447147 PMCID: PMC11057898 DOI: 10.1016/j.yjmcc.2022.04.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 03/28/2022] [Accepted: 04/12/2022] [Indexed: 10/18/2022]
Abstract
Obscurin is a large scaffolding protein in striated muscle that maintains sarcolemmal integrity and aligns the sarcoplasmic reticulum with the underlying contractile machinery. Ankyrins are a family of adaptor proteins with some isoforms that interact with obscurin. Previous studies have examined obscurin interacting with individual ankyrins. In this study, we demonstrate that two different ankyrins interact with obscurin's carboxyl terminus via independent ankyrin-binding domains (ABDs). Using in-vitro binding assays, co-precipitation assays, and FLIM-FRET analysis, we show that obscurin interacts with small ankyrin 1.5 (sAnk1.5) and the muscle-specific ankyrin-G isoform (AnkG107). While there is no direct interaction between sAnk1.5 and AnkG107, obscurin connects the two ankyrins both in vitro and in cells. Moreover, AnkG107 recruits β-spectrin to this macromolecular protein complex and mutating obscurin's ABDs disrupts complex formation. To further characterize AnkG107 interaction with obscurin, we measure obscurin-binding to different AnkG107 isoforms expressed in the heart and find that the first obscurin-binding domain in AnkG107 principally mediates this interaction. We also find that AnkG107 does not bind to filamin-C and displays minimal binding to plectin-1 compared to obscurin. Finally, both sAnk1.5-GFP and AnkG107-CTD-RFP are targeted to the M-lines of ventricular cardiomyocytes and mutating their obscurin-binding domains disrupts the M-line localization of these ankyrin constructs. Altogether, these findings support a model in which obscurin can interact via independent binding domains with two different ankyrin protein complexes to target them to the sarcomeric M-line of ventricular cardiomyocytes.
Collapse
Affiliation(s)
- Janani Subramaniam
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston, Houston, TX 77030, United States of America
| | - Gokay Yamankurt
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston, Houston, TX 77030, United States of America
| | - Shane R Cunha
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston, Houston, TX 77030, United States of America.
| |
Collapse
|