1
|
Li S, Zhang M, Ge L. Reconstitution of membrane contact by unilamellar vesicles. Biophys Rep 2023; 9:188-194. [PMID: 38516622 PMCID: PMC10951472 DOI: 10.52601/bpr.2023.230011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 09/12/2023] [Indexed: 03/23/2024] Open
Abstract
Eukaryotic cells compartmentalize diverse biochemical functions within organelles defined by intracellular membranes. Recent focus has intensified on studying the interactions among organelles and the role of membrane contacts in maintaining cellular balance. While analyzing these contacts mainly involves fluorescence and electron microscopy, as well as biochemical cell fractionation, understanding their mechanisms and responses to genetic and environmental changes remains challenging. Here we describe an approach employing in vitro reconstitution of membrane contacts using unilamellar vesicles. This technique offers insights into contact mechanisms when combined with established methods like fluorescence imaging and mass spectrometry, potentially deepening our understanding of membrane contacts and organelle networks.
Collapse
Affiliation(s)
- Shulin Li
- State Key Laboratory of Membrane Biology, Beijing 100101, China
- Tsinghua-Peking Center for Life Sciences, Beijing 100084, China
- School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Min Zhang
- School of Pharmaceutical Sciences, Tsinghua University, Beijing 100084, China
| | - Liang Ge
- State Key Laboratory of Membrane Biology, Beijing 100101, China
- Tsinghua-Peking Center for Life Sciences, Beijing 100084, China
- School of Life Sciences, Tsinghua University, Beijing 100084, China
| |
Collapse
|
2
|
HAN GWANHEE, YUN HEE, CHUNG JOONYONG, KIM JAEHOON, CHO HANBYOUL. TMED9 Expression Level as a Biomarker of Epithelial Ovarian Cancer Progression and Prognosis. Cancer Genomics Proteomics 2022; 19:692-702. [PMID: 36316042 PMCID: PMC9620446 DOI: 10.21873/cgp.20352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/23/2022] [Accepted: 07/28/2022] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Transmembrane emp24 domain-containing protein 9 (TMED9) belongs to the TMED/p24 family that transports, modifies, and packs proteins and lipids into vesicles for delivery to specific locations and is important in innate immune signaling via the endoplasmic reticulum-Golgi cargo pathway. TMED9 has been implicated in various cancer types; however, its role in epithelial ovarian cancer (EOC) is unclear. In this study, we aimed to elucidate the role and clinical significance of TMED9 in EOC. MATERIALS AND METHODS mRNA and protein levels of TMED9 and their associations with clinicopathological features in EOCs were evaluated using RNA-sequencing and immunohistochemistry data. Functional studies assessing the tumorigenic role of TMED9 in EOC cell lines were also performed. RESULTS The mRNA expression of TMED9 was up-regulated in EOC compared to that in normal ovarian epithelium. TMED9 protein expression increased in progression from normal ovarian epithelium to EOC (p<0.001). Moreover, high expression of TMED9 was associated with advanced stage, serous cell type and poor histological grade in EOC and demonstrated independent prognostic significance for both disease-free and overall survival. Further functional studies showed that TMED9 knockdown reduced migration, invasion, cell proliferation, and colony formation of EOC cells. CONCLUSION Overall, our results support the use of TMED9 as a valuable prognostic biomarker and provide evidence for targeting of TMED9 as a novel strategy for EOC treatment.
Collapse
Affiliation(s)
- GWAN HEE HAN
- Department of Obstetrics and Gynecology, Kyung Hee University Hospital at Gangdong, Seoul, Republic of Korea
| | - HEE YUN
- Department of Obstetrics and Gynecology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - JOON-YONG CHUNG
- Molecular Imaging Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, U.S.A
| | - JAE-HOON KIM
- Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Seoul, Republic of Korea,Institute of Women’s Life Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - HANBYOUL CHO
- Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Seoul, Republic of Korea,Institute of Women’s Life Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea
| |
Collapse
|
3
|
Abstract
Formation of the double-membrane autophagosome requires membrane reorganization of the endomembrane system to generate membrane precursors. The ER-Golgi trafficking system has been shown to provide membranes for phagophore growth. Nonetheless, how the components of the ER-Golgi system are redirected toward autophagosome biogenesis remains unclear. Here, we identify a new type of membrane contact formed between the ER-Golgi intermediate compartment (ERGIC) and the ER-exit sites (ERES) under macroautophagy/autophagy-induction conditions. The ERGIC-ERES contact is established by the TMED9-PREB/SEC12 interaction and regulates the biogenesis of the ERGIC-COPII vesicles, which we found previously act as a membrane template for LC3 lipidation and autophagosome formation.
Collapse
Affiliation(s)
- Shulin Li
- The State Key Laboratory of Membrane Biology, Tsinghua University-Peking University Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Min Zhang
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, China
| | - Liang Ge
- The State Key Laboratory of Membrane Biology, Tsinghua University-Peking University Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| |
Collapse
|
4
|
Abstract
Over the years, molecular subtypes based on estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor-2 (HER-2) status have been observed to effectively guide decision-making for the optimal treatment of patients with breast carcinoma (BRCA). However, despite this progress, there are still more than 41,000 BRCA-related fatalities each year in the United States. Moreover, effective drug targets for triple-negative breast carcinoma (TNBC) are still lacking. Given its high mortality rate, it is necessary to investigate more biomarkers with prognostic and pathological relevance in BRCA. In our study, we examined the expression patterns and prognostic implications of transmembrane P24 trafficking protein 9 (TMED9) in BRCA using multiple public cohorts and BRCA specimens collected from Shanghai General Hospital. In addition to this, in vitro experiments were also performed to evaluate the effects of TMED9 expression in BRCA cell proliferation and migration. Our results have demonstrated that a high expression of TMED9 promoted BRCA cell proliferation and migration and predicted poor prognosis in patients with BRCA. In conclusion, TMED9 is a potential prognostic indicator and a possible drug target of BRCA.
Collapse
Affiliation(s)
- Gaoda Ju
- Department of Medical Oncology, Key Laboratory of Carcinogenesis & Translational Research (Ministry of Education/Beijing), Peking University Cancer Hospital and Institute, Beijing, China
| | - Cheng Xu
- Department of Pathology Center, Shanghai General Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Kai Zeng
- Department of Thyroid Surgery, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Tianhao Zhou
- Department of Biochemistry and Molecular Biology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center of Cancer, Tianjin, China.,Key Laboratory of Breast Cancer Prevention and Treatment of the Ministry of Education, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center of Cancer, Tianjin, China
| | - Lijuan Zang
- Department of Pathology Center, Shanghai General Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| |
Collapse
|
5
|
Del Olmo T, Lacarrière-Keïta C, Normandin C, Jean D, Boisvert FM, Jean S. RAB21 interacts with TMED10 and modulates its localization and abundance. Biol Open 2019; 8:bio.045336. [PMID: 31455601 PMCID: PMC6777364 DOI: 10.1242/bio.045336] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Membrane trafficking controls vesicular transport of cargo between cellular compartments. Vesicular trafficking is essential for cellular homeostasis and dysfunctional trafficking is linked to several pathologies such as neurodegenerative diseases. Following endocytosis, early endosomes act as sorting stations of internalized materials, routing cargo toward various fates. One important class of membrane trafficking regulators are RAB GTPases. RAB21 has been associated with multiple functions and regulates integrin internalization, endosomal sorting of specific clathrin-independent cargo and autophagy. Although RAB21 is mostly associated with early endosomes, it has been shown to mediate a specific sorting event at the Golgi. From mass spectrometry data, we identified a GTP-favored interaction between RAB21 and TMED10 and 9, essential regulators of COPI and COPII vesicles. Using RAB21 knockout cells, we describe the role of RAB21 in modulating TMED10 Golgi localization. Taken together, our study suggests a new potential function of RAB21 in modulating TMED10 trafficking, with relevance to neurodegenerative disorders. Summary: A small early endosomal RAB GTPase is found to interact with p24 family members, with potential impacts on p24 functions.
Collapse
Affiliation(s)
- Tomas Del Olmo
- Faculté de Médecine et des Sciences de la Santé, Département d'anatomie et de biologie cellulaire, Université de Sherbrooke, 3201, Rue Jean Mignault, Sherbrooke, Québec, Canada J1E 4K8
| | - Camille Lacarrière-Keïta
- Faculté de Médecine et des Sciences de la Santé, Département d'anatomie et de biologie cellulaire, Université de Sherbrooke, 3201, Rue Jean Mignault, Sherbrooke, Québec, Canada J1E 4K8
| | - Caroline Normandin
- Faculté de Médecine et des Sciences de la Santé, Département d'anatomie et de biologie cellulaire, Université de Sherbrooke, 3201, Rue Jean Mignault, Sherbrooke, Québec, Canada J1E 4K8
| | - Dominique Jean
- Faculté de Médecine et des Sciences de la Santé, Département d'anatomie et de biologie cellulaire, Université de Sherbrooke, 3201, Rue Jean Mignault, Sherbrooke, Québec, Canada J1E 4K8
| | - François-Michel Boisvert
- Faculté de Médecine et des Sciences de la Santé, Département d'anatomie et de biologie cellulaire, Université de Sherbrooke, 3201, Rue Jean Mignault, Sherbrooke, Québec, Canada J1E 4K8
| | - Steve Jean
- Faculté de Médecine et des Sciences de la Santé, Département d'anatomie et de biologie cellulaire, Université de Sherbrooke, 3201, Rue Jean Mignault, Sherbrooke, Québec, Canada J1E 4K8
| |
Collapse
|