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Liu CC, Kim YJ, Teh R, Garcia A, Hamilton EJ, Cornelius F, Baxter RC, Rasmussen HH. Displacement of Native FXYD Protein From Na+/K+-ATPase With Novel FXYD Peptide Derivatives: Effects on Doxorubicin Cytotoxicity. Front Oncol 2022; 12:859216. [PMID: 35371992 PMCID: PMC8968713 DOI: 10.3389/fonc.2022.859216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 02/21/2022] [Indexed: 11/13/2022] Open
Abstract
The seven mammalian FXYD proteins associate closely with α/β heterodimers of Na+/K+-ATPase. Most of them protect the β1 subunit against glutathionylation, an oxidative modification that destabilizes the heterodimer and inhibits Na+/K+-ATPase activity. A specific cysteine (Cys) residue of FXYD proteins is critical for such protection. One of the FXYD proteins, FXYD3, confers treatment resistance when overexpressed in cancer cells. We developed two FXYD3 peptide derivatives. FXYD3-pep CKCK retained the Cys residue that can undergo glutathionylation and that is critical for protecting the β1 subunit against glutathionylation. FXYD3-pep SKSK had all Cys residues mutated to Serine (Ser). The chemotherapeutic doxorubicin induces oxidative stress, and suppression of FXYD3 with siRNA in pancreatic- and breast cancer cells that strongly express FXYD3 increased doxorubicin-induced cytotoxicity. Exposing cells to FXYD3-pep SKSK decreased co-immunoprecipitation of FXYD3 with the α1 Na+/K+-ATPase subunit. FXYD3-pep SKSK reproduced the increase in doxorubicin-induced cytotoxicity seen after FXYD3 siRNA transfection in pancreatic- and breast cancer cells that overexpressed FXYD3, while FXYD3-pep CKCK boosted the native protein’s protection against doxorubicin. Neither peptide affected doxorubicin’s cytotoxicity on cells with no or low FXYD3 expression. Fluorescently labeled FXYD3-pep SKSK was detected in a perinuclear distribution in the cells overexpressing FXYD3, and plasmalemmal Na+/K+-ATPase turnover could not be implicated in the increased sensitivity to doxorubicin that FXYD3-pep SKSK caused. FXYD peptide derivatives allow rapid elimination or amplification of native FXYD protein function. Here, their effects implicate the Cys residue that is critical for countering β1 subunit glutathionylation in the augmentation of cytotoxicity with siRNA-induced downregulation of FXYD3.
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Affiliation(s)
- Chia-Chi Liu
- North Shore Heart Research Group, Kolling Medical Research Institute, University of Sydney, St Leonards, NSW, Australia
- *Correspondence: Chia-Chi Liu, ; Helge H. Rasmussen,
| | - Yeon Jae Kim
- North Shore Heart Research Group, Kolling Medical Research Institute, University of Sydney, St Leonards, NSW, Australia
| | - Rachel Teh
- North Shore Heart Research Group, Kolling Medical Research Institute, University of Sydney, St Leonards, NSW, Australia
| | - Alvaro Garcia
- School of Chemistry, University of Sydney, Camperdown, NSW, Australia
| | - Elisha J. Hamilton
- North Shore Heart Research Group, Kolling Medical Research Institute, University of Sydney, St Leonards, NSW, Australia
| | | | - Robert C. Baxter
- Hormones and Cancer Laboratories, Kolling Institute, University of Sydney, St Leonards, NSW, Australia
| | - Helge H. Rasmussen
- North Shore Heart Research Group, Kolling Medical Research Institute, University of Sydney, St Leonards, NSW, Australia
- Department of Cardiology, Royal North Shore Hospital, St Leonards, NSW, Australia
- *Correspondence: Chia-Chi Liu, ; Helge H. Rasmussen,
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Schmidt H, Gutjahr L, Sauter A, Zech F, Nchioua R, Stenger S, Frick M, Kirchhoff F, Dietl P, Wittekindt OH. Serially passaged, conditionally reprogrammed nasal epithelial cells as a model to study epithelial functions and SARS-CoV-2 infection. Am J Physiol Cell Physiol 2022; 322:C591-C604. [PMID: 35196166 PMCID: PMC8977148 DOI: 10.1152/ajpcell.00363.2021] [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] [Indexed: 11/22/2022]
Abstract
Primary airway epithelial cells (pAECs) cultivated at air-liquid interface (ALI) conditions are widely used as surrogates for human in vivo epithelia. To extend the proliferative capacity and to enable serially passaging of pAECs, conditional reprogramming (cr) has been employed in recent years. However, ALI epithelia derived from cr cells often display functional changes with increasing passages. This highlights the need for thorough validation of the ALI cultures for the respective application. In our study, we evaluated the use of serially passaged cr nasal epithelial cells (crNECs) as a model to study SARS-CoV-2 infection and effects on ion and water transport. NECs were obtained from healthy individuals and cultivated as ALI epithelia derived from passages 1, 2, 3, and 5. We compared epithelial differentiation, ion and water transport, and infection with SARS-CoV-2 between passages. Our results show that epithelia maintained major differentiation characteristics and physiological ion and water transport properties through all passages. However, the frequency of ciliated cells, short circuit currents reflecting epithelial Na+ channel (ENaC) and cystic fibrosis transmembrane conductance regulator (CFTR) activity and expression of aquaporin 3 and 5 decreased gradually over passages. crNECs also expressed SARS-CoV-2 receptors angiotensin converting enzyme 2 (ACE2) and transmembrane serin2 protease 2 (TMPRSS2) across all passages and allowed SARS-CoV-2 replication in all passages. In summary, we provide evidence that passaged crNECs provide an appropriate model to study SARS-CoV-2 infection and also epithelial transport function when considering some limitations that we defined herein.
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Affiliation(s)
- Hanna Schmidt
- Department of Pediatric and Adolescent Medicine, Ulm University Medical Cente, Ulm, Germany.,Institute of General Physiology, Ulm University, Ulm, Germany
| | - Lara Gutjahr
- Institute of General Physiology, Ulm University, Ulm, Germany
| | | | - Fabian Zech
- Institute of Molecular Virology, Ulm University Medical Center, Ulm, Germany
| | - Rayhane Nchioua
- Institute of Molecular Virology, Ulm University Medical Center, Ulm, Germany
| | - Steffen Stenger
- Institute of Medical Microbiology and Hygiene, Ulm University Medical Center, Ulm, Germany
| | - Manfred Frick
- Institute of General Physiology, Ulm University, Ulm, Germany
| | - Frank Kirchhoff
- Institute of Molecular Virology, Ulm University Medical Center, Ulm, Germany
| | - Paul Dietl
- Institute of General Physiology, Ulm University, Ulm, Germany
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Abdel Hameid R, Cormet-Boyaka E, Kuebler WM, Uddin M, Berdiev BK. Reply to Eisenhut. Am J Physiol Lung Cell Mol Physiol 2021; 321:L287-L289. [PMID: 34233142 PMCID: PMC8270517 DOI: 10.1152/ajplung.00246.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Affiliation(s)
- Reem Abdel Hameid
- Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates
| | | | - Wolfgang M Kuebler
- Institute of Physiology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Mohammed Uddin
- Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates
| | - Bakhrom K Berdiev
- Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates
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