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Loss of Mature Lamin A/C Triggers a Shift in Intracellular Metabolic Homeostasis via AMPKα Activation. Cells 2022; 11:cells11243988. [PMID: 36552752 PMCID: PMC9777081 DOI: 10.3390/cells11243988] [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: 08/21/2022] [Revised: 12/06/2022] [Accepted: 12/06/2022] [Indexed: 12/14/2022] Open
Abstract
The roles of lamin A/C in adipocyte differentiation and skeletal muscle lipid metabolism are associated with familial partial lipodystrophy of Dunnigan (FPLD). We confirmed that LMNA knockdown (KD) in mouse adipose-derived mesenchymal stem cells (AD-MSCs) prevented adipocyte maturation. Importantly, in in vitro experiments, we discovered a significant increase in phosphorylated lamin A/C levels at serine 22 or 392 sites (pLamin A/C-S22/392) accompanying increased lipid synthesis in a liver cell line (7701 cells) and two hepatocellular carcinoma (HCC) cell lines (HepG2 and MHCC97-H cells). Moreover, HCC cells did not survive after LMNA knockout (KO) or even KD. Evidently, the functions of lamin A/C differ between the liver and adipose tissue. To date, the mechanism of hepatocyte lipid metabolism mediated by nuclear lamin A/C remains unclear. Our in-depth study aimed to identify the molecular connection between lamin A/C and pLamin A/C, hepatic lipid metabolism and liver cancer. Gain- and loss-of-function experiments were performed to investigate functional changes and the related molecular pathways in 7701 cells. Adenosine 5' monophosphate-activated protein kinase α (AMPKα) was activated when abnormalities in functional lamin A/C were observed following lamin A/C depletion or farnesyltransferase inhibitor (FTI) treatment. Active AMPKα directly phosphorylated acetyl-CoA-carboxylase 1 (ACC1) and subsequently inhibited lipid synthesis but induced glycolysis in both HCC cells and normal cells. According to the mass spectrometry analysis, lamin A/C potentially regulated AMPKα activation through its chaperone proteins, ATPase or ADP/ATP transporter 2. Lonafarnib (an FTI) combined with low-glucose conditions significantly decreased the proliferation of the two HCC cell lines more efficiently than lonafarnib alone by inhibiting glycolysis or the maturation of prelamin A.
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2
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Mechanisms of immune aging in HIV. Clin Sci (Lond) 2022; 136:61-80. [PMID: 34985109 DOI: 10.1042/cs20210344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 12/13/2021] [Accepted: 12/14/2021] [Indexed: 12/11/2022]
Abstract
Massive CD4+ T-cell depletion as well as sustained immune activation and inflammation are hallmarks of Human Immunodeficiency Virus (HIV)-1 infection. In recent years, an emerging concept draws an intriguing parallel between HIV-1 infection and aging. Indeed, many of the alterations that affect innate and adaptive immune subsets in HIV-infected individuals are reminiscent of the process of immune aging, characteristic of old age. These changes, of which the presumed cause is the systemic immune activation established in patients, likely participate in the immuno-incompetence described with HIV progression. With the success of antiretroviral therapy (ART), HIV-seropositive patients can now live for many years despite chronic viral infection. However, acquired immunodeficiency syndrome (AIDS)-related opportunistic infections have given way to chronic diseases as the leading cause of death since HIV infection. Therefore, the comparison between HIV-1 infected patients and uninfected elderly individuals goes beyond the sole onset of immunosenescence and extends to the deterioration of several physiological functions related to inflammation and systemic aging. In light of this observation, it is interesting to understand the precise link between immune activation and aging in HIV-1 infection to figure out how to best care for people living with HIV (PLWH).
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3
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miR-9 Does Not Regulate Lamin A Expression in Metastatic Cells from Lung Adenocarcinoma. Int J Mol Sci 2020; 21:ijms21051599. [PMID: 32111074 PMCID: PMC7084260 DOI: 10.3390/ijms21051599] [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: 01/17/2020] [Revised: 02/20/2020] [Accepted: 02/22/2020] [Indexed: 11/17/2022] Open
Abstract
In lung adenocarcinoma, low lamin A expression in pleural metastatic cells has been proposed as a pejorative factor. miR-9 physiologically inhibits the expression of lamin A in neural cells and seems to be a central actor in the carcinogenesis and the metastatic process in lung cancer. Thus, it could be a good candidate to explain the reduction of lamin A expression in lung adenocarcinoma cells. miR-9 expression was analyzed in 16 pleural effusions containing metastatic cells from lung adenocarcinoma and was significantly reduced in patients from the 'Low lamin A expression' group compared to patients from the 'High lamin A expression' group. Then, carcinoma cells selection by fluorescence-activated cell sorting (FACS) was performed according to epithelial membrane antigen (EMA) expression, reflecting lamin A expression. miR-9 was underexpressed in lamin A- carcinoma cells compared to lamin A+ carcinoma cells in patients from the 'Low lamin A expression' group, whereas there was no difference of miR-9 expression between lamin A+ and lamin A- carcinoma cells in patients from the 'High lamin A expression' group. These results suggest that miR-9 does not regulate lamin A expression in metastatic cells from lung adenocarcinoma. On the contrary, miR-9 expression was shown to be reduced in lamin A-negative carcinoma cells.
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4
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Heizer PJ, Yang Y, Tu Y, Kim PH, Chen NY, Hu Y, Yoshinaga Y, de Jong PJ, Vergnes L, Morales JE, Li RL, Jackson N, Reue K, Young SG, Fong LG. Deficiency in ZMPSTE24 and resulting farnesyl-prelamin A accumulation only modestly affect mouse adipose tissue stores. J Lipid Res 2020; 61:413-421. [PMID: 31941672 DOI: 10.1194/jlr.ra119000593] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 01/14/2020] [Indexed: 11/20/2022] Open
Abstract
Zinc metallopeptidase STE24 (ZMPSTE24) is essential for the conversion of farnesyl-prelamin A to mature lamin A, a key component of the nuclear lamina. In the absence of ZMPSTE24, farnesyl-prelamin A accumulates in the nucleus and exerts toxicity, causing a variety of disease phenotypes. By ∼4 months of age, both male and female Zmpste24 -/- mice manifest a near-complete loss of adipose tissue, but it has never been clear whether this phenotype is a direct consequence of farnesyl-prelamin A toxicity in adipocytes. To address this question, we generated a conditional knockout Zmpste24 allele and used it to create adipocyte-specific Zmpste24-knockout mice. To boost farnesyl-prelamin A levels, we bred in the "prelamin A-only" Lmna allele. Gene expression, immunoblotting, and immunohistochemistry experiments revealed that adipose tissue in these mice had decreased Zmpste24 expression along with strikingly increased accumulation of prelamin A. In male mice, Zmpste24 deficiency in adipocytes was accompanied by modest changes in adipose stores (an 11% decrease in body weight, a 23% decrease in body fat mass, and significantly smaller gonadal and inguinal white adipose depots). No changes in adipose stores were detected in female mice, likely because prelamin A expression in adipose tissue is lower in female mice. Zmpste24 deficiency in adipocytes did not alter the number of macrophages in adipose tissue, nor did it alter plasma levels of glucose, triglycerides, or fatty acids. We conclude that ZMPSTE24 deficiency in adipocytes, and the accompanying accumulation of farnesyl-prelamin A, reduces adipose tissue stores, but only modestly and only in male mice.
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Affiliation(s)
- Patrick J Heizer
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Ye Yang
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Yiping Tu
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Paul H Kim
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Natalie Y Chen
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Yan Hu
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Yuko Yoshinaga
- Children's Hospital Oakland Research Institute, Oakland, CA 94609
| | - Pieter J de Jong
- Children's Hospital Oakland Research Institute, Oakland, CA 94609
| | - Laurent Vergnes
- Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095
| | - Jazmin E Morales
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Robert L Li
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Nicholas Jackson
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Karen Reue
- Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095
| | - Stephen G Young
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095 .,Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095
| | - Loren G Fong
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
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5
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López-Alonso I, Blázquez-Prieto J, Amado-Rodríguez L, González-López A, Astudillo A, Sánchez M, Huidobro C, López-Martínez C, Dos Santos CC, Albaiceta GM. Preventing loss of mechanosensation by the nuclear membranes of alveolar cells reduces lung injury in mice during mechanical ventilation. Sci Transl Med 2019; 10:10/456/eaam7598. [PMID: 30158154 DOI: 10.1126/scitranslmed.aam7598] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 08/30/2017] [Accepted: 01/25/2018] [Indexed: 01/08/2023]
Abstract
The nuclear membrane acts as a mechanosensor that drives cellular responses following changes in the extracellular environment. Mechanically ventilated lungs are exposed to an abnormally high mechanical load that may result in clinically relevant alveolar damage. We report that mechanical ventilation in mice increased the expression of Lamin-A, a major determinant of nuclear membrane stiffness, in alveolar epithelial cells. Lamin-A expression increased and nuclear membrane compliance decreased in human bronchial epithelial cells after a mechanical stretch stimulus and in a murine model of lung injury after positive-pressure ventilation. Reducing Lamin-A maturation by depletion of the protease-encoding gene Zmpste24 preserved alveolar nuclear membrane compliance after mechanical ventilation in mice. Ventilator-induced proapoptotic gene expression changes and lung injury were reduced in mice lacking Zmpste24 compared to wild-type control animals. Similarly, treatment with the human immunodeficiency virus protease inhibitors lopinavir and ritonavir reduced the accumulation of Lamin-A at nuclear membranes and preserved nuclear membrane compliance after mechanical ventilation, mimicking the protective phenotype of Zmpste24-/- animals. These results show that the pathophysiological response to lung mechanical stretch is sensed by the nuclear membranes of lung alveolar cells, and suggest that protease inhibitors might be effective in preventing ventilator-induced lung injury.
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Affiliation(s)
- Inés López-Alonso
- Área del Corazón, Hospital Universitario Central de Asturias, 33011 Oviedo, Spain.,Departamento de Biología Funcional, Instituto Universitario de Oncología del Principado de Asturias, Universidad de Oviedo, 33005 Oviedo, Spain.,Instituto de Investigación Sanitaria del Principado de Asturias, 33011 Oviedo, Spain.,Centro de Investigación Biomédica En Red-Enfermedades Respiratorias, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Jorge Blázquez-Prieto
- Área del Corazón, Hospital Universitario Central de Asturias, 33011 Oviedo, Spain.,Departamento de Biología Funcional, Instituto Universitario de Oncología del Principado de Asturias, Universidad de Oviedo, 33005 Oviedo, Spain.,Instituto de Investigación Sanitaria del Principado de Asturias, 33011 Oviedo, Spain.,Centro de Investigación Biomédica En Red-Enfermedades Respiratorias, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Laura Amado-Rodríguez
- Área del Corazón, Hospital Universitario Central de Asturias, 33011 Oviedo, Spain.,Instituto de Investigación Sanitaria del Principado de Asturias, 33011 Oviedo, Spain.,Centro de Investigación Biomédica En Red-Enfermedades Respiratorias, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Adrián González-López
- Centro de Investigación Biomédica En Red-Enfermedades Respiratorias, Instituto de Salud Carlos III, 28029 Madrid, Spain.,Department of Anesthesiology and Operative Intensive Care Medicine, Charité Universitätsmedizin, 10117 Berlin, Germany
| | - Aurora Astudillo
- Servicio de Anatomía Patológica, Hospital Universitario Central de Asturias, 33011 Oviedo, Spain.,Departamento de Cirugía y Especialidades Médicoquirúrgicas, Universidad de Oviedo, 33005 Oviedo, Spain
| | - Manuel Sánchez
- Área de Farmacología, Departamento de Medicina, Universidad de Oviedo, 33005 Oviedo, Spain
| | - Covadonga Huidobro
- Área del Corazón, Hospital Universitario Central de Asturias, 33011 Oviedo, Spain.,Instituto de Investigación Sanitaria del Principado de Asturias, 33011 Oviedo, Spain.,Centro de Investigación Biomédica En Red-Enfermedades Respiratorias, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Cecilia López-Martínez
- Departamento de Biología Funcional, Instituto Universitario de Oncología del Principado de Asturias, Universidad de Oviedo, 33005 Oviedo, Spain.,Instituto de Investigación Sanitaria del Principado de Asturias, 33011 Oviedo, Spain
| | - Claudia C Dos Santos
- Interdepartmental Division of Critical Care, Keenan Research Centre of the Li Ka Shing Knowledge Institute of St. Michael's Hospital, University of Toronto, Toronto, Ontario M5B 1WB, Canada
| | - Guillermo M Albaiceta
- Área del Corazón, Hospital Universitario Central de Asturias, 33011 Oviedo, Spain. .,Departamento de Biología Funcional, Instituto Universitario de Oncología del Principado de Asturias, Universidad de Oviedo, 33005 Oviedo, Spain.,Instituto de Investigación Sanitaria del Principado de Asturias, 33011 Oviedo, Spain.,Centro de Investigación Biomédica En Red-Enfermedades Respiratorias, Instituto de Salud Carlos III, 28029 Madrid, Spain
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6
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Matralis AN, Xanthopoulos D, Huot G, Lopes-Paciencia S, Cole C, de Vries H, Ferbeyre G, Tsantrizos YS. Molecular tools that block maturation of the nuclear lamin A and decelerate cancer cell migration. Bioorg Med Chem 2018; 26:5547-5554. [PMID: 30309670 DOI: 10.1016/j.bmc.2018.10.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 09/25/2018] [Accepted: 10/03/2018] [Indexed: 01/01/2023]
Abstract
Lamin A contributes to the structure of nuclei in all mammalian cells and plays an important role in cell division and migration. Mature lamin A is derived from a farnesylated precursor protein, known as prelamin A, which undergoes post-translational cleavage catalyzed by the zinc metalloprotease STE24 (ZPMSTE24). Accumulation of farnesylated prelamin A in the nuclear envelope compromises cell division, impairs mitosis and induces an increased expression of inflammatory gene products. ZMPSTE24 has been proposed as a potential therapeutic target in oncology. A library of peptidomimetic compounds were synthesized and screened for their ability to induce accumulation of prelamin A in cancer cells and block cell migration in pancreatic ductal adenocarcinoma cells. The results of this study suggest that inhibitors of lamin A maturation may interfere with cell migration, the biological process required for cancer metastasis.
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Affiliation(s)
- Alexios N Matralis
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A 0B8, Canada
| | - Dimitrios Xanthopoulos
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A 0B8, Canada
| | - Geneviève Huot
- Département de Biochimie et medicine moléculaire, CRCHUM, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada
| | - Stéphane Lopes-Paciencia
- Département de Biochimie et medicine moléculaire, CRCHUM, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada
| | - Charles Cole
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A 0B8, Canada
| | - Hugo de Vries
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A 0B8, Canada
| | - Gerardo Ferbeyre
- Département de Biochimie et medicine moléculaire, CRCHUM, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada
| | - Youla S Tsantrizos
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A 0B8, Canada; Department of Biochemistry, McGill University, 3649 Promenade Sir William Osler, Montreal, QC H3G 0B1, Canada.
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7
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Chronic use of proton pump inhibitors, adverse events and potential biological mechanisms: A translational analysis. Therapie 2018; 73:273-281. [DOI: 10.1016/j.therap.2017.08.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 08/31/2017] [Indexed: 01/12/2023]
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8
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Kaspi E, Frankel D, Guinde J, Perrin S, Laroumagne S, Robaglia-Schlupp A, Ostacolo K, Harhouri K, Tazi-Mezalek R, Micallef J, Dutau H, Tomasini P, De Sandre-Giovannoli A, Lévy N, Cau P, Astoul P, Roll P. Low lamin A expression in lung adenocarcinoma cells from pleural effusions is a pejorative factor associated with high number of metastatic sites and poor Performance status. PLoS One 2017; 12:e0183136. [PMID: 28806747 PMCID: PMC5555706 DOI: 10.1371/journal.pone.0183136] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 07/31/2017] [Indexed: 11/29/2022] Open
Abstract
The type V intermediate filament lamins are the principal components of the nuclear matrix, including the nuclear lamina. Lamins are divided into A-type and B-type, which are encoded by three genes, LMNA, LMNB1, and LMNB2. The alternative splicing of LMNA produces two major A-type lamins, lamin A and lamin C. Previous studies have suggested that lamins are involved in cancer development and progression. A-type lamins have been proposed as biomarkers for cancer diagnosis, prognosis, and/or follow-up. The aim of the present study was to investigate lamins in cancer cells from metastatic pleural effusions using immunofluorescence, western blotting, and flow cytometry. In a sub-group of lung adenocarcinomas, we found reduced expression of lamin A but not of lamin C. The reduction in lamin A expression was correlated with the loss of epithelial membrane antigen (EMA)/MUC-1, an epithelial marker that is involved in the epithelial to mesenchymal transition (EMT). Finally, the lamin A expression was inversely correlated with the number of metastatic sites and the WHO Performance status, and association of pleural, bone and lung metastatic localizations was more frequent when lamin A expression was reduced. In conclusion, low lamin A but not lamin C expression in pleural metastatic cells could represent a major actor in the development of metastasis, associated with EMT and could account for a pejorative factor correlated with a poor Performance status.
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Affiliation(s)
- Elise Kaspi
- Aix Marseille Univ, INSERM, GMGF, Marseille, France
- APHM, Hôpital la Timone, Service de Biologie Cellulaire, Marseille, France
| | - Diane Frankel
- Aix Marseille Univ, INSERM, GMGF, Marseille, France
- APHM, Hôpital la Timone, Service de Biologie Cellulaire, Marseille, France
| | - Julien Guinde
- Aix Marseille Univ, INSERM, GMGF, Marseille, France
- APHM, Hôpital Nord, Department of Thoracic Oncology–Pleural diseases–Interventional pulmonology, Marseille, France
| | | | - Sophie Laroumagne
- APHM, Hôpital Nord, Department of Thoracic Oncology–Pleural diseases–Interventional pulmonology, Marseille, France
| | - Andrée Robaglia-Schlupp
- Aix Marseille Univ, INSERM, GMGF, Marseille, France
- APHM, Hôpital la Timone, Service de Biologie Cellulaire, Marseille, France
- APHM, Hôpital la Timone, Département de Génétique Médicale et Centre de Ressources Biologiques, Marseille, France
| | | | | | - Rachid Tazi-Mezalek
- APHM, Hôpital Nord, Department of Thoracic Oncology–Pleural diseases–Interventional pulmonology, Marseille, France
| | - Joelle Micallef
- APHM, Hôpital la Timone, Service de Pharmacologie Clinique & Centre d’Investigation Clinique—CPCET, Marseille, France
- Aix Marseille Univ, CNRS, INT, Inst Neurosci Timone, Marseille, France
| | - Hervé Dutau
- APHM, Hôpital Nord, Department of Thoracic Oncology–Pleural diseases–Interventional pulmonology, Marseille, France
| | - Pascale Tomasini
- Aix Marseille Univ, APHM, Marseille Early Phases Cancer Trials Center CLIP, Marseille, France
| | - Annachiara De Sandre-Giovannoli
- Aix Marseille Univ, INSERM, GMGF, Marseille, France
- APHM, Hôpital la Timone, Département de Génétique Médicale et Centre de Ressources Biologiques, Marseille, France
| | - Nicolas Lévy
- Aix Marseille Univ, INSERM, GMGF, Marseille, France
- APHM, Hôpital la Timone, Département de Génétique Médicale et Centre de Ressources Biologiques, Marseille, France
| | - Pierre Cau
- Aix Marseille Univ, INSERM, GMGF, Marseille, France
| | - Philippe Astoul
- APHM, Hôpital Nord, Department of Thoracic Oncology–Pleural diseases–Interventional pulmonology, Marseille, France
- Aix Marseille Univ, Marseille, France
| | - Patrice Roll
- Aix Marseille Univ, INSERM, GMGF, Marseille, France
- APHM, Hôpital la Timone, Service de Biologie Cellulaire, Marseille, France
- * E-mail:
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9
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Tu Y, Sánchez-Iglesias S, Araújo-Vilar D, Fong LG, Young SG. LMNA missense mutations causing familial partial lipodystrophy do not lead to an accumulation of prelamin A. Nucleus 2017; 7:512-521. [PMID: 27841971 DOI: 10.1080/19491034.2016.1242542] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
A variety of missense mutations in LMNA (the gene for lamin C and prelamin A) cause familial partial lipodystrophy (FPLD), a disease associated with reduced adipose tissue, particularly in the limbs. Several studies have reported that fibroblasts from FPLD subjects have an accumulation of prelamin A. Those findings were intriguing but also perplexing because many of the LMNA missense mutations associated with lipodystrophy are located in sequences distant from the sequences required for the farnesylation of prelamin A and ZMPSTE24-mediated conversion of prelamin A to mature lamin A. Here, we revisited the issue of prelamin A accumulation in the setting of FPLD mutations. We used western blots with lamin A/C antibodies and prelamin A-specific monoclonal antibodies to assess prelamin A levels in wild-type fibroblasts and fibroblasts carrying LMNA mutations associated with lipodystrophy (R482W, I299V, C591F, T528M). None of the mutant fibroblasts exhibited an accumulation of prelamin A. Also, the amount of prelamin A accumulation in response to lopinavir (an inhibitor of ZMPSTE24) was similar in wild-type and mutant fibroblasts. Thus, the LMNA lipodystrophy mutations that we examined did not lead to prelamin A accumulation, nor did they render those cells more susceptible to prelamin A accumulation when ZMPSTE24 was inhibited by lopinavir.
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Affiliation(s)
- Yiping Tu
- a Department of Medicine , David Geffen School of Medicine, University of California , Los Angeles , CA , USA
| | - Sofía Sánchez-Iglesias
- c UETeM-Molecular Pathology Group , IDIS-CIMUS, University of Santiago de Compostela , Galicia , Spain
| | - David Araújo-Vilar
- c UETeM-Molecular Pathology Group , IDIS-CIMUS, University of Santiago de Compostela , Galicia , Spain
| | - Loren G Fong
- a Department of Medicine , David Geffen School of Medicine, University of California , Los Angeles , CA , USA
| | - Stephen G Young
- a Department of Medicine , David Geffen School of Medicine, University of California , Los Angeles , CA , USA.,b Human Genetics , David Geffen School of Medicine, University of California , Los Angeles , CA , USA
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10
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Mehmood S, Marcoux J, Gault J, Quigley A, Michaelis S, Young SG, Carpenter EP, Robinson CV. Mass spectrometry captures off-target drug binding and provides mechanistic insights into the human metalloprotease ZMPSTE24. Nat Chem 2016; 8:1152-1158. [PMID: 27874871 PMCID: PMC5123592 DOI: 10.1038/nchem.2591] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 07/05/2016] [Indexed: 12/25/2022]
Abstract
Off-target binding of hydrophobic drugs can lead to unwanted side effects, either through specific or non-specific binding to unintended membrane protein targets. However, distinguishing the binding of drugs to membrane proteins from that of detergents, lipids and cofactors is challenging. Here, we use high-resolution mass spectrometry to study the effects of HIV protease inhibitors on the human zinc metalloprotease ZMPSTE24. This intramembrane protease plays a major role in converting prelamin A to mature lamin A. We monitored the proteolysis of farnesylated prelamin A peptide by ZMPSTE24 and unexpectedly found retention of the C-terminal peptide product with the enzyme. We also resolved binding of zinc, lipids and HIV protease inhibitors and showed that drug binding blocked prelamin A peptide cleavage and conferred stability to ZMPSTE24. Our results not only have relevance for the progeria-like side effects of certain HIV protease inhibitor drugs, but also highlight new approaches for documenting off-target drug binding.
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Affiliation(s)
- Shahid Mehmood
- Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
| | - Julien Marcoux
- Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
| | - Joseph Gault
- Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
| | - Andrew Quigley
- Structural Genomics Consortium, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford OX3 7DQ, UK
| | - Susan Michaelis
- Department of Cell Biology, The Johns Hopkins School of Medicine, Baltimore, Maryland 21205, USA
| | - Stephen G Young
- Departments of Medicine and Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, California 90095, USA
| | - Elisabeth P Carpenter
- Structural Genomics Consortium, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford OX3 7DQ, UK
| | - Carol V Robinson
- Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
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11
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AIM2 inflammasome is activated by pharmacological disruption of nuclear envelope integrity. Proc Natl Acad Sci U S A 2016; 113:E4671-80. [PMID: 27462105 DOI: 10.1073/pnas.1602419113] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Inflammasomes are critical sensors that convey cellular stress and pathogen presence to the immune system by activating inflammatory caspases and cytokines such as IL-1β. The nature of endogenous stress signals that activate inflammasomes remains unclear. Here we show that an inhibitor of the HIV aspartyl protease, Nelfinavir, triggers inflammasome formation and elicits an IL-1R-dependent inflammation in mice. We found that Nelfinavir impaired the maturation of lamin A, a structural component of the nuclear envelope, thereby promoting the release of DNA in the cytosol. Moreover, deficiency of the cytosolic DNA-sensor AIM2 impaired Nelfinavir-mediated inflammasome activation. These findings identify a pharmacologic activator of inflammasome and demonstrate the role of AIM2 in detecting endogenous DNA release upon perturbation of nuclear envelope integrity.
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LMNA mutations resulting in lipodystrophy and HIV protease inhibitors trigger vascular smooth muscle cell senescence and calcification: Role of ZMPSTE24 downregulation. Atherosclerosis 2016; 245:200-11. [DOI: 10.1016/j.atherosclerosis.2015.12.012] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 11/21/2015] [Accepted: 12/07/2015] [Indexed: 11/23/2022]
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Schouten J, Wit FW, Stolte IG, Kootstra NA, van der Valk M, Geerlings SE, Prins M, Reiss P, Reiss P, Wit FWNM, van der Valk M, Schouten J, Kooij KW, van Zoest RA, Elsenga BC, Prins M, Stolte IG, Martens M, Moll S, Berkel J, Moller L, Visser GR, Welling C, Zaheri S, Hillebregt MMJ, Gras LAJ, Ruijs YMC, Benschop DP, Reiss P, Kootstra NA, Harskamp-Holwerda AM, Maurer I, Mangas Ruiz MM, Girigorie AF, van Leeuwen E, Janssen FR, Heidenrijk M, Schrijver JHN, Zikkenheiner W, Wezel M, Jansen-Kok CSM, Geerlings SE, Godfried MH, Goorhuis A, van der Meer JTM, Nellen FJB, van der Poll T, Prins JM, Reiss P, van der Valk M, Wiersinga WJ, Wit FWNM, van Eden J, Henderiks A, van Hes AMH, Mutschelknauss M, Nobel HE, Pijnappel FJJ, Westerman AM, de Jong J, Postema PG, Bisschop PHLT, Serlie MJM, Lips P, Dekker E, de Rooij SEJA, Willemsen JMR, Vogt L, Schouten J, Portegies P, Schmand BA, Geurtsen GJ, ter Stege JA, Klein Twennaar M, van Eck-Smit BLF, de Jong M, Richel DJ, Verbraak FD, Demirkaya N, Visser I, Ruhe HG, Nieuwkerk PT, van Steenwijk RP, Dijkers E, Majoie CBLM, Caan MWA, Su T, van Lunsen HW, Nievaard MAF, van den Born BJH, Stroes ESG, Mulder WMC. Cross-sectional Comparison of the Prevalence of Age-Associated Comorbidities and Their Risk Factors Between HIV-Infected and Uninfected Individuals: The AGEhIV Cohort Study. Clin Infect Dis 2014; 59:1787-97. [DOI: 10.1093/cid/ciu701] [Citation(s) in RCA: 498] [Impact Index Per Article: 49.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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