1
|
Dalton CM, Schlegel C, Hunter CJ. Caveolin-1: A Review of Intracellular Functions, Tissue-Specific Roles, and Epithelial Tight Junction Regulation. BIOLOGY 2023; 12:1402. [PMID: 37998001 PMCID: PMC10669080 DOI: 10.3390/biology12111402] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 10/27/2023] [Accepted: 10/31/2023] [Indexed: 11/25/2023]
Abstract
Caveolin-1 (Cav1) is a vital protein for many cellular processes and is involved in both the positive and negative regulation of these processes. Cav1 exists in multiple cellular compartments depending on its role. Of particular interest is its contribution to the formation of plasma membrane invaginations called caveolae and its involvement in cytoskeletal interactions, endocytosis, and cholesterol trafficking. Cav1 participates in stem cell differentiation as well as proliferation and cell death pathways, which is implicated in tumor growth and metastasis. Additionally, Cav1 has tissue-specific functions that are adapted to the requirements of the cells within those tissues. Its role has been described in adipose, lung, pancreatic, and vascular tissue and in epithelial barrier maintenance. In both the intestinal and the blood brain barriers, Cav1 has significant interactions with junctional complexes that manage barrier integrity. Tight junctions have a close relationship with Cav1 and this relationship affects both their level of expression and their location within the cell. The ubiquitous nature of Cav1 both within the cell and within specific tissues is what makes the protein important for ongoing research as it can assist in further understanding pathophysiologic processes and can potentially be a target for therapies.
Collapse
Affiliation(s)
- Cody M. Dalton
- Division of Pediatric Surgery, Oklahoma Children’s Hospital, 1200 Everett Drive, ET NP 2320, Oklahoma City, OK 73104, USA; (C.S.); (C.J.H.)
- Health Sciences Center, Department of Surgery, University of Oklahoma, 800 Research Parkway, Suite 449, Oklahoma City, OK 73104, USA
| | - Camille Schlegel
- Division of Pediatric Surgery, Oklahoma Children’s Hospital, 1200 Everett Drive, ET NP 2320, Oklahoma City, OK 73104, USA; (C.S.); (C.J.H.)
- Health Sciences Center, Department of Surgery, University of Oklahoma, 800 Research Parkway, Suite 449, Oklahoma City, OK 73104, USA
| | - Catherine J. Hunter
- Division of Pediatric Surgery, Oklahoma Children’s Hospital, 1200 Everett Drive, ET NP 2320, Oklahoma City, OK 73104, USA; (C.S.); (C.J.H.)
- Health Sciences Center, Department of Surgery, University of Oklahoma, 800 Research Parkway, Suite 449, Oklahoma City, OK 73104, USA
| |
Collapse
|
2
|
El Atab O, Ghantous CM, El-Zein N, Farhat R, Agouni A, Korashy HM, Djouhri L, Kamareddine L, Zibara K, Zeidan A. Involvement of caveolae in hyperglycemia-induced changes in adiponectin and leptin expressions in vascular smooth muscle cells. Eur J Pharmacol 2021; 919:174701. [PMID: 34954233 DOI: 10.1016/j.ejphar.2021.174701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 12/07/2021] [Accepted: 12/13/2021] [Indexed: 11/03/2022]
Abstract
Hyperglycemia exerts various harmful effects on the vasculature. Studies have shown an association between the levels of the adipokines leptin and adiponectin (APN) and vascular complications in diabetes mellitus. The aim of our study was to investigate the molecular mechanisms mediated by APN and leptin that are involved in hyperglycemia-induced vascular remodeling, especially at the level of oxidative stress and actin cytoskeleton dynamics. Rat aorta organ culture was used to investigate the effect of hyperglycemia on APN and leptin protein expression in vascular smooth muscle cells (VSMCs) using Western blot analysis and immunohistochemistry. Hyperglycemia lead to a significant increase in APN synthesis in VSMCs, mainly through caveolae, but this increase failed to provide vascular protection because of the decreased expression of APN receptors, especially AdipoR2, which was assessed by qPCR. In addition, hyperglycemia significantly upregulated leptin expression in VSMCs through caveolae and the RhoA/ROCK pathway. These variations lead to a marked increase in reactive oxygen species (ROS) production, detected by dihydroethidium (DHE) staining, and in NADPH oxidase type 4 (Nox4) expression. Moreover, Nox4 mediated the synthesis of APN in hyperglycemia in VSMCs. Finally, hyperglycemia activated the RhoA/ROCK pathway and subsequently induced the polymerization of globular actin (G-actin) into filamentous actin (F-actin), decreasing the G/F-actin ratio. Taken together, these data show that hyperglycemia increases oxidative stress and changes actin cytoskeleton dynamics in the aorta via caveolae, favoring vascular remodeling.
Collapse
Affiliation(s)
- Ola El Atab
- Department of Anatomy, Cell Biology and Physiology, American University of Beirut, Beirut, Lebanon; PRASE and Department of Biology, Faculty of Sciences-I, Lebanese University, Beirut, Lebanon
| | - Crystal M Ghantous
- Department of Anatomy, Cell Biology and Physiology, American University of Beirut, Beirut, Lebanon; Department of Nursing and Health Sciences, Faculty of Nursing and Health Sciences, Notre Dame University-Louaize, Keserwan, Lebanon
| | - Nabil El-Zein
- PRASE and Department of Biology, Faculty of Sciences-I, Lebanese University, Beirut, Lebanon
| | - Rima Farhat
- Department of Anatomy, Cell Biology and Physiology, American University of Beirut, Beirut, Lebanon
| | - Abdelali Agouni
- Department of Pharmaceutical Sciences, College of Pharmacy, QU Health, Qatar University, Doha, Qatar; Biomedical and Pharmaceutical Research Unit, QU Health, Qatar University, Qatar
| | - Hesham M Korashy
- Department of Pharmaceutical Sciences, College of Pharmacy, QU Health, Qatar University, Doha, Qatar; Biomedical and Pharmaceutical Research Unit, QU Health, Qatar University, Qatar
| | - Laiche Djouhri
- Biomedical and Pharmaceutical Research Unit, QU Health, Qatar University, Qatar; Department of Basic Sciences, College of Medicine, QU Health, Qatar University, Doha, Qatar
| | - Layla Kamareddine
- Biomedical and Pharmaceutical Research Unit, QU Health, Qatar University, Qatar; Biomedical Sciences Department, College of Health Sciences, QU Health, Qatar University, Doha, Qatar; Biomedical Research Center, Qatar University, Doha, P.O. Box 2713, Qatar
| | - Kazem Zibara
- PRASE and Department of Biology, Faculty of Sciences-I, Lebanese University, Beirut, Lebanon
| | - Asad Zeidan
- Biomedical and Pharmaceutical Research Unit, QU Health, Qatar University, Qatar; Department of Basic Sciences, College of Medicine, QU Health, Qatar University, Doha, Qatar.
| |
Collapse
|
3
|
Silva LND, Garcia IJP, Valadares JMM, Pessoa MTC, Toledo MM, Machado MV, Busch MS, Rocha I, Villar JAFP, Atella GC, Santos HL, Cortes VF, Barbosa LA. Evaluation of Cardiotonic Steroid Modulation of Cellular Cholesterol and Phospholipid. J Membr Biol 2021; 254:499-512. [PMID: 34716469 DOI: 10.1007/s00232-021-00203-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 10/09/2021] [Indexed: 02/05/2023]
Abstract
We have previously shown that 21-benzylidene digoxin (21-BD) increases the total cholesterol and phospholipid content on the membrane of HeLa cells. Lipid modulation caused by cardiotonic steroids (CTS) is still unexplored. Therefore, the aim of the present study was to evaluate the cholesterol and phospholipid modulation of the cell membrane caused by ouabain and 21-BD and the possible involvement of the caveolae on this modulation. For this, one cell line containing caveolae (HeLa) and other not containing (Caco-2) were used. The modulation of the lipid profile was evaluated by total cholesterol and phospholipids measurements, and identification of membrane phospholipids by HPTLC. The cholesterol distribution was evaluated by filipin staining. The caveolin-1 expression was evaluated by Western Blotting. Ouabain had no effect on the total membrane lipid content in both cell lines. However, 21-BD increased total membrane phospholipid content and had no effect on the membrane cholesterol content in Caco-2 cells. CTS were not able to alter the specific phospholipids content. In the filipin experiments, 21-BD provoked a remarkable redistribution of cholesterol to the perinuclear region of HeLa cells. In Caco-2 cells, it was observed only a slight increase in cholesterol, especially as intracellular vesicles. The caveolin-1 expression was not altered by any of the compounds. Our data mainly show different effects of two cardiotonic steroids. Ouabain had no effect on the lipid profile of cells, whereas 21-BD causes important changes in cholesterol and phospholipid content. Therefore, the modulation of cholesterol content in the plasma membrane of HeLa cells is not correlated with the expression of caveolin-1.
Collapse
Affiliation(s)
- Lilian N D Silva
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinópolis, MG, Zip Code: 35501-296, Brazil.,Laboratório de Bioquímica de Membranas e ATPases, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Israel J P Garcia
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinópolis, MG, Zip Code: 35501-296, Brazil.,Laboratório de Bioquímica de Membranas e ATPases, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Jessica M M Valadares
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinópolis, MG, Zip Code: 35501-296, Brazil.,Laboratório de Bioquímica de Membranas e ATPases, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Marco Tulio C Pessoa
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinópolis, MG, Zip Code: 35501-296, Brazil.,Laboratório de Bioquímica de Membranas e ATPases, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Marina Marques Toledo
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinópolis, MG, Zip Code: 35501-296, Brazil.,Laboratório de Bioquímica de Membranas e ATPases, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Matheus V Machado
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Mileane Souza Busch
- Laboratório de Bioquímica de Lipídios, Instituto de Bioquímica Médica Leopoldo de Meis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Isabella Rocha
- Laboratório de Bioquímica de Lipídios, Instituto de Bioquímica Médica Leopoldo de Meis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - José Augusto F P Villar
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Georgia C Atella
- Laboratório de Bioquímica de Lipídios, Instituto de Bioquímica Médica Leopoldo de Meis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Herica L Santos
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinópolis, MG, Zip Code: 35501-296, Brazil.,Laboratório de Bioquímica de Membranas e ATPases, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Vanessa F Cortes
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinópolis, MG, Zip Code: 35501-296, Brazil. .,Laboratório de Bioquímica de Membranas e ATPases, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil.
| | - Leandro A Barbosa
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinópolis, MG, Zip Code: 35501-296, Brazil. .,Laboratório de Bioquímica de Membranas e ATPases, Universidade Federal de São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil.
| |
Collapse
|
4
|
Kim J, Choi H, Kang EK, Ji GY, Kim Y, Choi IS. In Vitro Studies on Therapeutic Effects of Cannabidiol in Neural Cells: Neurons, Glia, and Neural Stem Cells. Molecules 2021; 26:molecules26196077. [PMID: 34641624 PMCID: PMC8512311 DOI: 10.3390/molecules26196077] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/28/2021] [Accepted: 09/30/2021] [Indexed: 11/25/2022] Open
Abstract
(‒)-Cannabidiol (CBD) is one of the major phytocannabinoids extracted from the Cannabis genus. Its non-psychoactiveness and therapeutic potential, partly along with some anecdotal—if not scientific or clinical—evidence on the prevention and treatment of neurological diseases, have led researchers to investigate the biochemical actions of CBD on neural cells. This review summarizes the previously reported mechanistic studies of the CBD actions on primary neural cells at the in vitro cell-culture level. The neural cells are classified into neurons, microglia, astrocytes, oligodendrocytes, and neural stem cells, and the CBD effects on each cell type are described. After brief introduction on CBD and in vitro studies of CBD actions on neural cells, the neuroprotective capability of CBD on primary neurons with the suggested operating actions is discussed, followed by the reported CBD actions on glia and the CBD-induced regeneration from neural stem cells. A summary section gives a general overview of the biochemical actions of CBD on neural cells, with a future perspective. This review will provide a basic and fundamental, but crucial, insight on the mechanistic understanding of CBD actions on neural cells in the brain, at the molecular level, and the therapeutic potential of CBD in the prevention and treatment of neurological diseases, although to date, there seem to have been relatively limited research activities and reports on the cell culture-level, in vitro studies of CBD effects on primary neural cells.
Collapse
Affiliation(s)
- Jungnam Kim
- Department of Chemistry, KAIST, Daejeon 34141, Korea; (J.K.); (H.C.); (E.K.K.)
| | - Hyunwoo Choi
- Department of Chemistry, KAIST, Daejeon 34141, Korea; (J.K.); (H.C.); (E.K.K.)
| | - Eunhye K. Kang
- Department of Chemistry, KAIST, Daejeon 34141, Korea; (J.K.); (H.C.); (E.K.K.)
| | - Gil Yong Ji
- Cannabis Medical, Inc., Sandong-ro 433-31, Eumbong-myeon, Asan-si 31418, Korea; (G.Y.J.); (Y.K.)
| | - Youjeong Kim
- Cannabis Medical, Inc., Sandong-ro 433-31, Eumbong-myeon, Asan-si 31418, Korea; (G.Y.J.); (Y.K.)
| | - Insung S. Choi
- Department of Chemistry, KAIST, Daejeon 34141, Korea; (J.K.); (H.C.); (E.K.K.)
- Correspondence:
| |
Collapse
|
5
|
Ramírez CM, Torrecilla-Parra M, Pardo-Marqués V, de-Frutos MF, Pérez-García A, Tabraue C, de la Rosa JV, Martín-Rodriguez P, Díaz-Sarmiento M, Nuñez U, Orizaola MC, Través PG, Camps M, Boscá L, Castrillo A. Crosstalk Between LXR and Caveolin-1 Signaling Supports Cholesterol Efflux and Anti-Inflammatory Pathways in Macrophages. Front Endocrinol (Lausanne) 2021; 12:635923. [PMID: 34122329 PMCID: PMC8190384 DOI: 10.3389/fendo.2021.635923] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 02/24/2021] [Indexed: 02/05/2023] Open
Abstract
Macrophages are immune cells that play crucial roles in host defense against pathogens by triggering their exceptional phagocytic and inflammatory functions. Macrophages that reside in healthy tissues also accomplish important tasks to preserve organ homeostasis, including lipid uptake/efflux or apoptotic-cell clearance. Both homeostatic and inflammatory functions of macrophages require the precise stability of lipid-rich microdomains located at the cell membrane for the initiation of downstream signaling cascades. Caveolin-1 (Cav-1) is the main protein responsible for the biogenesis of caveolae and plays an important role in vascular inflammation and atherosclerosis. The Liver X receptors (LXRs) are key transcription factors for cholesterol efflux and inflammatory gene responses in macrophages. Although the role of Cav-1 in cellular cholesterol homeostasis and vascular inflammation has been reported, the connection between LXR transcriptional activity and Cav-1 expression and function in macrophages has not been investigated. Here, using gain and loss of function approaches, we demonstrate that LXR-dependent transcriptional pathways modulate Cav-1 expression and compartmentation within the membrane during macrophage activation. As a result, Cav-1 participates in LXR-dependent cholesterol efflux and the control of inflammatory responses. Together, our data show modulation of the LXR-Cav-1 axis could be exploited to control exacerbated inflammation and cholesterol overload in the macrophage during the pathogenesis of lipid and immune disorders, such as atherosclerosis.
Collapse
Affiliation(s)
- Cristina M. Ramírez
- Instituto Madrileño de Estudios Avanzados (IMDEA) Research Institute of Food and Health Sciences, Madrid, Spain
- *Correspondence: Antonio Castrillo, ; Cristina M. Ramírez,
| | - Marta Torrecilla-Parra
- Instituto Madrileño de Estudios Avanzados (IMDEA) Research Institute of Food and Health Sciences, Madrid, Spain
| | - Virginia Pardo-Marqués
- Instituto Madrileño de Estudios Avanzados (IMDEA) Research Institute of Food and Health Sciences, Madrid, Spain
| | - Mario Fernández de-Frutos
- Instituto Madrileño de Estudios Avanzados (IMDEA) Research Institute of Food and Health Sciences, Madrid, Spain
| | - Ana Pérez-García
- Instituto Madrileño de Estudios Avanzados (IMDEA) Research Institute of Food and Health Sciences, Madrid, Spain
| | - Carlos Tabraue
- Unidad de Biomedicina (Unidad Asociada al CSIC), Instituto Universitario de Investigaciones Biomédicas y Sanitarias (IUIBS) de la Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain
- Departamento de Morfología, Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain
| | - Juan Vladimir de la Rosa
- Unidad de Biomedicina (Unidad Asociada al CSIC), Instituto Universitario de Investigaciones Biomédicas y Sanitarias (IUIBS) de la Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain
| | - Patricia Martín-Rodriguez
- Unidad de Biomedicina (Unidad Asociada al CSIC), Instituto Universitario de Investigaciones Biomédicas y Sanitarias (IUIBS) de la Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain
| | - Mercedes Díaz-Sarmiento
- Unidad de Biomedicina (Unidad Asociada al CSIC), Instituto Universitario de Investigaciones Biomédicas y Sanitarias (IUIBS) de la Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain
| | - Uxue Nuñez
- Unidad de Biomedicina (Unidad Asociada al CSIC), Instituto Universitario de Investigaciones Biomédicas y Sanitarias (IUIBS) de la Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain
| | - Marta C. Orizaola
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas CSIC-Universidad Autónoma de Madrid, Madrid, Spain
| | - Paqui G. Través
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas CSIC-Universidad Autónoma de Madrid, Madrid, Spain
| | - Marta Camps
- Institut de Biomedicina (IBUB), Universitat de Barcelona, Barcelona, Spain
| | - Lisardo Boscá
- Unidad de Biomedicina (Unidad Asociada al CSIC), Instituto Universitario de Investigaciones Biomédicas y Sanitarias (IUIBS) de la Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas CSIC-Universidad Autónoma de Madrid, Madrid, Spain
- Centro de Investigación en Red sobre Enfermedades Cardiovasculares (CIBERCV), Madrid, Spain
| | - Antonio Castrillo
- Unidad de Biomedicina (Unidad Asociada al CSIC), Instituto Universitario de Investigaciones Biomédicas y Sanitarias (IUIBS) de la Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas CSIC-Universidad Autónoma de Madrid, Madrid, Spain
- *Correspondence: Antonio Castrillo, ; Cristina M. Ramírez,
| |
Collapse
|
6
|
Torices S, Roberts SA, Park M, Malhotra A, Toborek M. Occludin, caveolin-1, and Alix form a multi-protein complex and regulate HIV-1 infection of brain pericytes. FASEB J 2020; 34:16319-16332. [PMID: 33058236 PMCID: PMC7686148 DOI: 10.1096/fj.202001562r] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 09/18/2020] [Accepted: 10/02/2020] [Indexed: 12/24/2022]
Abstract
HIV-1 enters the brain by altering properties of the blood-brain barrier (BBB). Recent evidence indicates that among cells of the BBB, pericytes are prone to HIV-1 infection. Occludin (ocln) and caveolin-1 (cav-1) are critical determinants of BBB integrity that can regulate barrier properties of the BBB in response to HIV-1 infection. Additionally, Alix is an early acting endosomal factor involved in HIV-1 budding from the cells. The aim of the present study was to evaluate the role of cav-1, ocln, and Alix in HIV-1 infection of brain pericytes. Our results indicated that cav-1, ocln, and Alix form a multi-protein complex in which they cross-regulate each other's expression. Importantly, the stability of this complex was affected by HIV-1 infection. Modifications of the complex resulted in diminished HIV-1 infection and alterations of the cytokine profile produced by brain pericytes. These results identify a novel mechanism involved in HIV-1 infection contributing to a better understanding of the HIV-1 pathology and the associated neuroinflammatory responses.
Collapse
Affiliation(s)
- Silvia Torices
- Department of Biochemistry and Molecular BiologyUniversity of Miami Miller School of MedicineMiamiFLUSA
| | - Samantha A. Roberts
- Department of Biochemistry and Molecular BiologyUniversity of Miami Miller School of MedicineMiamiFLUSA
| | - Minseon Park
- Department of Biochemistry and Molecular BiologyUniversity of Miami Miller School of MedicineMiamiFLUSA
| | - Arun Malhotra
- Department of Biochemistry and Molecular BiologyUniversity of Miami Miller School of MedicineMiamiFLUSA
| | - Michal Toborek
- Department of Biochemistry and Molecular BiologyUniversity of Miami Miller School of MedicineMiamiFLUSA
| |
Collapse
|
7
|
de Souza GM, de Albuquerque Borborema ME, de Lucena TMC, da Silva Santos AF, de Lima BR, de Oliveira DC, de Azevêdo Silva J. Caveolin-1 (CAV-1) up regulation in metabolic syndrome: all roads leading to the same end. Mol Biol Rep 2020; 47:9245-9250. [PMID: 33123955 DOI: 10.1007/s11033-020-05945-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 10/22/2020] [Indexed: 01/02/2023]
Abstract
Metabolic syndrome (MS) is a set of clinical conditions such as insulin resistance, hyperglycemia, systemic arterial hypertension (SAH), dyslipidemia, obesity and high abdominal circumference. Some of these clinical characteristics have been associated with caveolin-1, a caveolae structural protein, responsible for insulin activation, storage and degradation of cholesterol, and so on. Herein we assessed CAV-1 mRNA levels in MS patients comparing to healthy controls (HC) and according patients' clinical features. We included 87 patients in the study, 25 patients with MS, 30 patients with at least one clinical condition (diabetes, SAH, dyslipidemia, obesity and high abdominal circumference), 13 with two clinical conditions and 19 HC. CAV-1 mRNA levels from peripheral blood samples were assessed by Real Time qPCR using specific Taqman probe. The analysis was performed using ∆Cq method and the statistical tests Shapiro-Wilk, One-Way ANOVA and Mann-Whitney. We found CAV-1 increased mRNA levels in patients with MS (1.645 FC, p = 9.794 × 10-20) and even higher in patients with only one or two clinical conditions (2.215 FC, p = 1.215 × 10-32 and 1.716 FC, p = 4.197 × 10-05, respectively). When individual clinical conditions were observed, individuals with high abdominal circumference and obesity present a significantly up regulation when compared to HC (2.956 FC, p = 0.0004 and 3.643 FC, p = 0.002, respectively). This work indicates that CAV-1 gene expression from whole blood samples is associated to MS clinical conditions and may become a potential target for MS treatment and prevention.
Collapse
Affiliation(s)
- Gabriela Montenegro de Souza
- Laboratório de Genética e Biologia Molecular Humana, Departamento de Genética, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Recife, Pernambuco, CEP 50760-901, Brazil
| | - Maria Eduarda de Albuquerque Borborema
- Laboratório de Genética e Biologia Molecular Humana, Departamento de Genética, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Recife, Pernambuco, CEP 50760-901, Brazil
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Thays Maria Costa de Lucena
- Laboratório de Genética e Biologia Molecular Humana, Departamento de Genética, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Recife, Pernambuco, CEP 50760-901, Brazil
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Ariane Fernandes da Silva Santos
- Laboratório de Genética e Biologia Molecular Humana, Departamento de Genética, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Recife, Pernambuco, CEP 50760-901, Brazil
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Brenda Regina de Lima
- Laboratório de Genética e Biologia Molecular Humana, Departamento de Genética, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Recife, Pernambuco, CEP 50760-901, Brazil
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Dinaldo Cavalcanti de Oliveira
- Divisão de Cardiologia, Departamento de Medicina Clínica, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Jaqueline de Azevêdo Silva
- Laboratório de Genética e Biologia Molecular Humana, Departamento de Genética, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Recife, Pernambuco, CEP 50760-901, Brazil.
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
| |
Collapse
|
8
|
Sahay B, Mergia A. The Potential Contribution of Caveolin 1 to HIV Latent Infection. Pathogens 2020; 9:pathogens9110896. [PMID: 33121153 PMCID: PMC7692328 DOI: 10.3390/pathogens9110896] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/22/2020] [Accepted: 10/23/2020] [Indexed: 12/25/2022] Open
Abstract
Combinatorial antiretroviral therapy (cART) suppresses HIV replication to undetectable levels and has been effective in prolonging the lives of HIV infected individuals. However, cART is not capable of eradicating HIV from infected individuals mainly due to HIV’s persistence in small reservoirs of latently infected resting cells. Latent infection occurs when the HIV-1 provirus becomes transcriptionally inactive and several mechanisms that contribute to the silencing of HIV transcription have been described. Despite these advances, latent infection remains a major hurdle to cure HIV infected individuals. Therefore, there is a need for more understanding of novel mechanisms that are associated with latent infection to purge HIV from infected individuals thoroughly. Caveolin 1(Cav-1) is a multifaceted functional protein expressed in many cell types. The expression of Cav-1 in lymphocytes has been controversial. Recent evidence, however, convincingly established the expression of Cav-1 in lymphocytes. In lieu of this finding, the current review examines the potential role of Cav-1 in HIV latent infection and provides a perspective that helps uncover new insights to understand HIV latent infection.
Collapse
Affiliation(s)
| | - Ayalew Mergia
- Correspondence: ; Tel.: +352-294-4139; Fax: +352-392-9704
| |
Collapse
|
9
|
Abstract
Iron deficiency (ID) is a common and ominous comorbidity in heart failure (HF) and predicts worse outcomes, independently of the presence of anaemia. Accumulated data from animal models of systemic ID suggest that ID is associated with several functional and structural abnormalities of the heart. However, the exact role of myocardial iron deficiency irrespective of systemic ID and/or anaemia has been elusive. Recently, several transgenic models of cardiac-specific ID have been developed to investigate the influence of ID on cardiac tissue. In this review, we discuss structural and functional cardiac consequences of ID in these models and summarize data from clinical studies. Moreover, the beneficial effects of intravenous iron supplementation are specified.
Collapse
|
10
|
Comorbidities of HIV infection: role of Nef-induced impairment of cholesterol metabolism and lipid raft functionality. AIDS 2020; 34:1-13. [PMID: 31789888 PMCID: PMC6903377 DOI: 10.1097/qad.0000000000002385] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Combination antiretroviral therapy has dramatically changed the outcome of HIV infection, turning it from a death sentence to a manageable chronic disease. However, comorbidities accompanying HIV infection, such as metabolic and cardio-vascular diseases, as well as cognitive impairment, persist despite successful virus control by combination antiretroviral therapy and pose considerable challenges to clinical management of people living with HIV. These comorbidities involve a number of pathological processes affecting a variety of different tissues and cells, making it challenging to identify a common cause(s) that would link these different diseases to HIV infection. In this article, we will present evidence that impairment of cellular cholesterol metabolism may be a common factor driving pathogenesis of HIV-associated comorbidities. Potential implications for therapeutic approaches are discussed.
Collapse
|
11
|
Huang Q, Zhong W, Hu Z, Tang X. A review of the role of cav-1 in neuropathology and neural recovery after ischemic stroke. J Neuroinflammation 2018; 15:348. [PMID: 30572925 PMCID: PMC6302517 DOI: 10.1186/s12974-018-1387-y] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 11/29/2018] [Indexed: 12/12/2022] Open
Abstract
Ischemic stroke starts a series of pathophysiological processes that cause brain injury. Caveolin-1 (cav-1) is an integrated protein and locates at the caveolar membrane. It has been demonstrated that cav-1 can protect blood–brain barrier (BBB) integrity by inhibiting matrix metalloproteases (MMPs) which degrade tight junction proteins. This article reviews recent developments in understanding the mechanisms underlying BBB dysfunction, neuroinflammation, and oxidative stress after ischemic stroke, and focuses on how cav-1 modulates a series of activities after ischemic stroke. In general, cav-1 reduces BBB permeability mainly by downregulating MMP9, reduces neuroinflammation through influencing cytokines and inflammatory cells, promotes nerve regeneration and angiogenesis via cav-1/VEGF pathway, reduces apoptosis, and reduces the damage mediated by oxidative stress. In addition, we also summarize some experimental results that are contrary to the above and explore possible reasons for these differences.
Collapse
Affiliation(s)
- Qianyi Huang
- Department of Neurology, The Second Xiangya Hospital, Central South University, Renmin Road 139#, Changsha, 410011, Hunan, China
| | - Wei Zhong
- Department of Neurology, The Second Xiangya Hospital, Central South University, Renmin Road 139#, Changsha, 410011, Hunan, China
| | - Zhiping Hu
- Department of Neurology, The Second Xiangya Hospital, Central South University, Renmin Road 139#, Changsha, 410011, Hunan, China
| | - Xiangqi Tang
- Department of Neurology, The Second Xiangya Hospital, Central South University, Renmin Road 139#, Changsha, 410011, Hunan, China.
| |
Collapse
|
12
|
Udayantha HMV, Bathige SDNK, Priyathilaka TT, Lee S, Kim MJ, Lee J. Identification and characterization of molluscan caveolin-1 ortholog from Haliotis discus discus: Possible involvement in embryogenesis and host defense mechanism against pathogenic stress. Gene Expr Patterns 2017; 27:85-92. [PMID: 29128397 DOI: 10.1016/j.gep.2017.11.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 06/13/2017] [Accepted: 11/06/2017] [Indexed: 02/05/2023]
Abstract
Caveolins are principal membrane proteins of caveolae that play a central role in signal transduction, substrate transport, and membrane trafficking in various cell types. Numerous studies have reported the crucial role of caveolin-1 (CAV1) in response to invading microbes; yet, very little is known about molluscan CAV1. In this study, we identified and characterized CAV1 ortholog from the disk abalone, Haliotis discus discus (HdCAV1). The cDNA sequence of HdCAV1 is 826 bp long and encodes a 127-amino acid polypeptide. Characteristic caveolin superfamily domain (Glu3 - Lys126) and two possible transmembrane domains (Cys48 - Tyr67 and Ile103 - Phe120) were identified in the HdCAV1 protein. Homology analysis revealed that HdCAV1 shared higher identity (>47%) with molluscans, but lower identity with other species. Phylogenetic tree constructed by the neighbor-joining (NJ) method revealed a distinct evolutionary pathway for molluscans. Transcriptional analysis by SYBR Green qPCR showed the highest expression of HdCAV1 mRNA in late veliger stage, as compared to that in other embryonic developmental stages of disk abalone. In adult animals, gill tissue showed highest HdCAV1 transcript levels under normal physiological condition. Stimulations with two bacteria (Vibrio parahaemolyticus and Listeria monocytogenes), viral hemorrhagic septicemia virus, and two pathogen-associated molecular patterns (LPS and poly I:C) significantly modulated the expression of HdCAV1 transcripts. Collectively, these data suggest that CAV1 plays an important role in embryogenesis and host immune defense in disk abalone.
Collapse
Affiliation(s)
- H M V Udayantha
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea; Department of Fisheries and Aquaculture, Faculty of Fisheries and Marine Sciences and Technology, University of Ruhuna, Matara, Sri Lanka
| | - S D N K Bathige
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea; Sri Lanka Institute of Nanotechnology (SLINTEC), Nanotechnology and Science Park, Mahenwatta, Pitipana, Homagama, Sri Lanka
| | - Thanthrige Thiunuwan Priyathilaka
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea; Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea
| | - Sukkyoung Lee
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea; Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea
| | - Myoung-Jin Kim
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea; Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea.
| | - Jehee Lee
- Department of Marine Life Sciences, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea; Fish Vaccine Research Center, Jeju National University, Jeju Self-Governing Province 63243, Republic of Korea.
| |
Collapse
|
13
|
Xu J, Jia X, Gu Y, Lewis DF, Gu X, Wang Y. Vitamin D Reduces Oxidative Stress-Induced Procaspase-3/ROCK1 Activation and MP Release by Placental Trophoblasts. J Clin Endocrinol Metab 2017; 102:2100-2110. [PMID: 28368445 PMCID: PMC5470774 DOI: 10.1210/jc.2016-3753] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 03/15/2017] [Indexed: 01/26/2023]
Abstract
CONTEXT Increased microparticle (MP) shedding by placental trophoblasts contributes to maternal vascular inflammatory response and endothelial dysfunction in preeclampsia. Vitamin D has beneficial effects in pregnancy; however, its effect on trophoblast MP release has not been investigated. OBJECTIVE To investigate if vitamin D could protect trophoblasts from oxidative stress-induced MP release. DESIGN Placental trophoblasts were isolated from uncomplicated and preeclamptic placentas. Effects of vitamin D on MP release induced by oxidative stress inducer CoCl2 were studied. MAIN OUTCOME MEASURES Annexin V+ MPs were assessed by flow cytometry. Expression of caveolin-1, endothelial nitric oxide synthase (eNOS), procaspase-3, cleaved caspase-3, and Rho-associated coiled-coil protein kinase 1 (ROCK1) in trophoblasts and trophoblast-derived MPs were determined by Western blot. RESULTS Trophoblasts from preeclamptic pregnancies released significantly more MPs than cells from uncomplicated pregnancies (P < 0.01). CoCl2-induced increase in MP release was associated with upregulation of caveolin-1 and downregulation of eNOS expression in trophoblasts (P < 0.05), which could be attenuated by 1,25(OH)2D3. Moreover, 1,25(OH)2D3 could also inhibit CoCl2-induced procaspase-3 cleavage and ROCK1 activation in trophoblasts. Consistently, CoCl2-induced upregulation of procaspase-3, cleaved caspase-3, and ROCK1 expression in trophoblast-derived MPs were also reduced in cells treated with 1,25(OH)2D3. CONCLUSIONS Placental trophoblasts from preeclamptic pregnancies released more MP than cells from uncomplicated pregnancies. Oxidative stress-induced increase in MP shedding is associated with upregulation of caveolin-1 and downregulation of eNOS expression in placental trophoblasts. Inhibition of caspase-3 cleavage and ROCK1 activation, together with upregulation of eNOS expression, could be the potential cellular/molecular mechanism(s) of vitamin D protective effects on placental trophoblasts.
Collapse
Affiliation(s)
- Jie Xu
- Department of Obstetrics and Gynecology, Louisiana State University Health Sciences Center, Shreveport, Louisiana 71130
- Department of Physiology, Harbin Medical University, Harbin, Heilongjiang 150086, China
| | - Xiuyue Jia
- Department of Obstetrics and Gynecology, Louisiana State University Health Sciences Center, Shreveport, Louisiana 71130
| | - Yang Gu
- Department of Obstetrics and Gynecology, Louisiana State University Health Sciences Center, Shreveport, Louisiana 71130
| | - David F Lewis
- Department of Obstetrics and Gynecology, Louisiana State University Health Sciences Center, Shreveport, Louisiana 71130
| | - Xin Gu
- Department of Pathology, Louisiana State University Health Sciences Center, Shreveport, Louisiana 71130
| | - Yuping Wang
- Department of Obstetrics and Gynecology, Louisiana State University Health Sciences Center, Shreveport, Louisiana 71130
| |
Collapse
|
14
|
Gao C, Wang Q, Chung SK, Shen J. Crosstalk of metabolic factors and neurogenic signaling in adult neurogenesis: Implication of metabolic regulation for mental and neurological diseases. Neurochem Int 2017; 106:24-36. [DOI: 10.1016/j.neuint.2017.02.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 01/10/2017] [Accepted: 02/03/2017] [Indexed: 12/31/2022]
|
15
|
The Role of Caveolin 1 in HIV Infection and Pathogenesis. Viruses 2017; 9:v9060129. [PMID: 28587148 PMCID: PMC5490806 DOI: 10.3390/v9060129] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 05/02/2017] [Accepted: 05/22/2017] [Indexed: 12/29/2022] Open
Abstract
Caveolin 1 (Cav-1) is a major component of the caveolae structure and is expressed in a variety of cell types including macrophages, which are susceptible to human immunodeficiency virus (HIV) infection. Caveolae structures are present in abundance in mechanically stressed cells such as endothelial cells and adipocytes. HIV infection induces dysfunction of these cells and promotes pathogenesis. Cav-1 and the caveolae structure are believed to be involved in multiple cellular processes that include signal transduction, lipid regulation, endocytosis, transcytosis, and mechanoprotection. Such a broad biological role of Cav-1/caveolae is bound to have functional cross relationships with several molecular pathways including HIV replication and viral-induced pathogenesis. The current review covers the relationship of Cav-1 and HIV in respect to viral replication, persistence, and the potential role in pathogenesis.
Collapse
|
16
|
Demirci NS, Dogan M, Erdem GU, Kacar S, Turhan T, Kilickap S, Cigirgan LC, Kayacetin E, Bozkaya Y, Zengin N. Is plasma caveolin-1 level a prognostic biomarker in metastatic pancreatic cancer? Saudi J Gastroenterol 2017; 23:183-189. [PMID: 28611342 PMCID: PMC5470378 DOI: 10.4103/sjg.sjg_483_16] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND/AIMS To evaluate the prognostic significance of plasma caveolin (CAV)-1 and its association with survival and treatment response rates in metastatic pancreatic cancer (MPC). PATIENTS AND METHODS Plasma samples were prospectively collected from 41 patients with newly diagnosed MPC. Moreover, plasma samples were collected from 48 patients with chronic pancreatitis and 41 healthy individuals (control groups) for assessing Cav-1 levels. Plasma Cav-1 levels were evaluated at baseline and after three cycles of chemotherapy in the patients with MPC. RESULTS The median Cav-1 level was 13.8 ng/mL for the patients with MPC and 12.2 ng/mL for healthy individuals (P = 0.009). The Cav-1 cut-off level was calculated as 11.6 ng/mL by using the receiver operating characteristic curve. The median overall survival and progression-free survival rates were 5 and 2.4 months, respectively, for participants with a high basal plasma Cav-1 level; the corresponding values were 10.5 and 9.4 months for participants with a low plasma Cav-1 level (P = 0.011 and P= 0.003, respectively). Of the 41 patients with MPC, 23 completed at least three cycles of chemotherapy. The median Cav-1 level was 13 ng/mL for post-treatment MPC (r2: 0.917; P= 0.001). High basal plasma caveolin-1 level have continued to remain at high levels even after chemotherapy, showing a trend toward worse response rates (P = 0.086). CONCLUSION High basal plasma Cav-1 levels seem to be associated with poor survival and tend to yield worse therapeutic outcomes in patients with MPC. This study is the first to evaluate the prognostic significance of plasma Cav-1 levels as a prognostic factor in patients with MPC. However, larger prospective clinical trials are warranted.
Collapse
Affiliation(s)
- Nebi S. Demirci
- Department of Medical Oncology, Ankara Numune Training and Research Hospital, Ankara, Turkey,Address for correspondence: Dr. Nebi S. Demirci, Department of Medical Oncology, Ankara Numune Training and Research Hospital, Ankara, Turkey. E-mail:
| | - Mutlu Dogan
- Department of Medical Oncology, Ankara Numune Training and Research Hospital, Ankara, Turkey
| | - Gokmen U. Erdem
- Department of Medical Oncology, Ankara Numune Training and Research Hospital, Ankara, Turkey
| | - Sabite Kacar
- Department of Gastroenterology, Turkiye Yuksek Ihtisas Training and Research Hospital, Ankara, Turkey
| | - Turan Turhan
- Department of Biochemistry, Ankara Numune Training and Research Hospital, Ankara, Turkey
| | - Saadettin Kilickap
- Department of Medical Oncology, Hacettepe University Medical Faculty, Ankara, Turkey
| | - Lutfi C. Cigirgan
- Department of Biochemistry, Ankara Numune Training and Research Hospital, Ankara, Turkey
| | - Ertugrul Kayacetin
- Department of Gastroenterology, Turkiye Yuksek Ihtisas Training and Research Hospital, Ankara, Turkey
| | - Yakup Bozkaya
- Department of Medical Oncology, Ankara Numune Training and Research Hospital, Ankara, Turkey
| | - Nurullah Zengin
- Department of Medical Oncology, Ankara Numune Training and Research Hospital, Ankara, Turkey
| |
Collapse
|
17
|
Wang J, Chen H, Cao P, Wu X, Zang F, Shi L, Liang L, Yuan W. Inflammatory cytokines induce caveolin-1/β-catenin signalling in rat nucleus pulposus cell apoptosis through the p38 MAPK pathway. Cell Prolif 2016; 49:362-72. [PMID: 27125453 DOI: 10.1111/cpr.12254] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 02/18/2016] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES Apoptosis of nucleus pulposus (NP) cells is a major cause of intervertebral disc degeneration. To elucidate relationships between caveolin-1 and cytokine-induced apoptosis, we investigated the role of caveolin-1 in cytokine-induced apoptosis in rat NP cells and the related signalling pathway. MATERIALS AND METHODS Rat NP cells were treated with interleukin (IL)-1β or tumour necrosis factor alpha (TNF-α), and knockdown of caveolin-1 and β-catenin was achieved using specific siRNAs. Then, apoptotic level of rat NP cells and expression and activation of caveolin-1/β-catenin signalling were assessed by flow cytometric analysis, qRT-PCR, western blotting and luciferase assays. The relationship between the mitogen-activated protein kinase (MAPK) pathway and caveolin-1 promoter activity was also determined by luciferase assays. RESULTS IL-1β and TNF-α induced apoptosis, upregulated caveolin-1 expression and activated Wnt/β-catenin signalling in rat NP cells, while the induction effect of cytokines was reversed by caveolin-1 siRNA and β-catenin siRNA. Promotion of rat NP cell apoptosis and nuclear translocation of β-catenin induced by caveolin-1 overexpression were abolished by β-catenin siRNA. Furthermore, pretreatment with a p38 MAPK inhibitor or dominant negative-p38, blocked cytokine-dependent induction of caveolin-1/β-catenin expression and activity. CONCLUSIONS The results revealed the role of p38/caveolin-1/β-catenin in inflammatory cytokine-induced apoptosis in rat NP cells. Thus, controlling p38/caveolin-1/β-catenin activity seemed to regulate IL-1β- and TNF-α-induced apoptosis in the NP during intervertebral disc degeneration.
Collapse
Affiliation(s)
- Jianxi Wang
- Department of Orthopaedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China
| | - Huajiang Chen
- Department of Orthopaedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China
| | - Peng Cao
- Department of Orthopaedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China
| | - Xiaodong Wu
- Department of Orthopaedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China
| | - Fazhi Zang
- Department of Orthopaedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China
| | - Liangyu Shi
- Department of Orthopaedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China
| | - Lei Liang
- Department of Orthopaedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China
| | - Wen Yuan
- Department of Orthopaedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, 200003, China
| |
Collapse
|
18
|
Bone marrow-derived macrophages exclusively expressed caveolin-2: The role of inflammatory activators and hypoxia. Immunobiology 2015. [DOI: 10.1016/j.imbio.2015.06.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
19
|
Knopf JD, Tholen S, Koczorowska MM, De Wever O, Biniossek ML, Schilling O. The stromal cell-surface protease fibroblast activation protein-α localizes to lipid rafts and is recruited to invadopodia. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015. [PMID: 26209915 DOI: 10.1016/j.bbamcr.2015.07.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Fibroblast activation protein alpha (FAPα) is a cell surface protease expressed by cancer-associated fibroblasts in the microenvironment of most solid tumors. As there is increasing evidence for proteases having non-catalytic functions, we determined the FAPα interactome in cancer-associated fibroblasts using the quantitative immunoprecipitation combined with knockdown (QUICK) method. Complex formation with adenosin deaminase, erlin-2, stomatin, prohibitin, Thy-1 membrane glycoprotein, and caveolin-1 was further validated by immunoblotting. Co-immunoprecipitation (co-IP) of the known stoichiometric FAPα binding partner dipeptidyl-peptidase IV (DPPIV) corroborated the proteomic strategy. Reverse co-IPs validated the FAPα interaction with caveolin-1, erlin-2, and stomatin while co-IP upon RNA-interference mediated knock-down of DPPIV excluded adenosin deaminase as a direct FAPα interaction partner. Many newly identified FAPα interaction partners localize to lipid rafts, including caveolin-1, a widely-used marker for lipid raft localization. We hypothesized that this indicates a recruitment of FAPα to lipid raft structures. In density gradient centrifugation, FAPα co-fractionates with caveolin-1. Immunofluorescence optical sectioning microscopy of FAPα and lipid raft markers further corroborates recruitment of FAPα to lipid rafts and invadopodia. FAPα is therefore an integral component of stromal lipid rafts in solid tumors. In essence, we provide one of the first interactome analyses of a cell surface protease and translate these results into novel biological aspects of a marker protein for cancer-associated fibroblasts.
Collapse
Affiliation(s)
- Julia D Knopf
- Institute of Molecular Medicine and Cell Research, University of Freiburg, D-79104 Freiburg, Germany; Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Stefan Tholen
- Institute of Molecular Medicine and Cell Research, University of Freiburg, D-79104 Freiburg, Germany
| | - Maria M Koczorowska
- Institute of Molecular Medicine and Cell Research, University of Freiburg, D-79104 Freiburg, Germany
| | - Olivier De Wever
- Laboratory of Experimental Cancer Research, Ghent University Hospital, 1P7, De Pintelaan 185, 9000 Gent, Belgium
| | - Martin L Biniossek
- Institute of Molecular Medicine and Cell Research, University of Freiburg, D-79104 Freiburg, Germany
| | - Oliver Schilling
- Institute of Molecular Medicine and Cell Research, University of Freiburg, D-79104 Freiburg, Germany; BIOSS Centre for Biological Signaling Studies, University of Freiburg, D-79104 Freiburg, Germany; German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany.
| |
Collapse
|
20
|
Catita J, López-Luppo M, Ramos D, Nacher V, Navarro M, Carretero A, Sánchez-Chardi A, Mendes-Jorge L, Rodriguez-Baeza A, Ruberte J. Imaging of cellular aging in human retinal blood vessels. Exp Eye Res 2015; 135:14-25. [PMID: 25818511 DOI: 10.1016/j.exer.2015.03.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 03/13/2015] [Accepted: 03/25/2015] [Indexed: 01/10/2023]
Abstract
To date two main aging vascular lesions have been reported in elderly human retinas: acellular capillaries and microaneurysms. However, their exact mechanism of formation remains unclear. Using high resolution microscopy techniques we revise cellular alterations observed in aged human retinal vessels, such as lipofuscin accumulation, caveolae malfunction, blood basement membrane disruption and enhanced apoptosis that could trigger the development of these aging vascular lesions. Moreover, we have generated a set of original images comparing retinal vasculature between middle and old aged healthy humans to show in a comprehensive manner the main structural and ultrastructural alterations occurred during age in retinal blood vessels.
Collapse
Affiliation(s)
- J Catita
- Center of Animal Biotechnology and Gene Therapy, Universitat Autònoma de Barcelona, Bellaterra, Spain; Department of Animal Health and Anatomy, School of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - M López-Luppo
- Center of Animal Biotechnology and Gene Therapy, Universitat Autònoma de Barcelona, Bellaterra, Spain; Department of Animal Health and Anatomy, School of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain; Interdisciplinary Centre of Research in Animal Health, Faculty of Veterinary Medicine, Universidade de Lisboa, Lisbon, Portugal
| | - D Ramos
- Center of Animal Biotechnology and Gene Therapy, Universitat Autònoma de Barcelona, Bellaterra, Spain; Department of Animal Health and Anatomy, School of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - V Nacher
- Center of Animal Biotechnology and Gene Therapy, Universitat Autònoma de Barcelona, Bellaterra, Spain; Department of Animal Health and Anatomy, School of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain; Interdisciplinary Centre of Research in Animal Health, Faculty of Veterinary Medicine, Universidade de Lisboa, Lisbon, Portugal
| | - M Navarro
- Center of Animal Biotechnology and Gene Therapy, Universitat Autònoma de Barcelona, Bellaterra, Spain; Department of Animal Health and Anatomy, School of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain; Interdisciplinary Centre of Research in Animal Health, Faculty of Veterinary Medicine, Universidade de Lisboa, Lisbon, Portugal
| | - A Carretero
- Center of Animal Biotechnology and Gene Therapy, Universitat Autònoma de Barcelona, Bellaterra, Spain; Department of Animal Health and Anatomy, School of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain; Interdisciplinary Centre of Research in Animal Health, Faculty of Veterinary Medicine, Universidade de Lisboa, Lisbon, Portugal
| | - A Sánchez-Chardi
- Microscopy Facility, Faculty of Science, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - L Mendes-Jorge
- Center of Animal Biotechnology and Gene Therapy, Universitat Autònoma de Barcelona, Bellaterra, Spain; Interdisciplinary Centre of Research in Animal Health, Faculty of Veterinary Medicine, Universidade de Lisboa, Lisbon, Portugal; Department of Morphology and Function, Faculty of Veterinary Medicine, Universidade de Lisboa, Lisbon, Portugal
| | - A Rodriguez-Baeza
- Department of Morphological Sciences, School of Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - J Ruberte
- Center of Animal Biotechnology and Gene Therapy, Universitat Autònoma de Barcelona, Bellaterra, Spain; Department of Animal Health and Anatomy, School of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain; Interdisciplinary Centre of Research in Animal Health, Faculty of Veterinary Medicine, Universidade de Lisboa, Lisbon, Portugal; CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Barcelona, Spain.
| |
Collapse
|
21
|
Rizzo V. The Role of Caveolae and Caveolins in Atherogenesis. Atherosclerosis 2015. [DOI: 10.1002/9781118828533.ch18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
22
|
Yang G, Dong Z, Xu H, Wang C, Li H, Li Z, Li F. Structural study of caveolin-1 intramembrane domain by circular dichroism and nuclear magnetic resonance. Biopolymers 2015; 104:11-20. [DOI: 10.1002/bip.22597] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 10/22/2014] [Accepted: 11/30/2014] [Indexed: 01/08/2023]
Affiliation(s)
- Guanhua Yang
- State Key Laboratory of Supramolecular Structure and Materials; Jilin University; Changchun 130012 People's Republic of China
| | - Zhe Dong
- State Key Laboratory of Supramolecular Structure and Materials; Jilin University; Changchun 130012 People's Republic of China
| | - Haoran Xu
- Key Laboratory for Molecular Enzymology & Engineering; The Ministry of Education, Jilin University; Changchun 130012 People's Republic of China
| | - Chunyu Wang
- State Key Laboratory of Supramolecular Structure and Materials; Jilin University; Changchun 130012 People's Republic of China
| | - Haichao Li
- Key Laboratory for Molecular Enzymology & Engineering; The Ministry of Education, Jilin University; Changchun 130012 People's Republic of China
| | - Zhengqiang Li
- Key Laboratory for Molecular Enzymology & Engineering; The Ministry of Education, Jilin University; Changchun 130012 People's Republic of China
| | - Fei Li
- State Key Laboratory of Supramolecular Structure and Materials; Jilin University; Changchun 130012 People's Republic of China
| |
Collapse
|
23
|
Role of caveolin-3 in lymphocyte activation. Life Sci 2014; 121:35-9. [PMID: 25476831 DOI: 10.1016/j.lfs.2014.11.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 11/14/2014] [Accepted: 11/19/2014] [Indexed: 11/24/2022]
Abstract
AIMS Caveolins are structural proteins clustered in lipid-rich regions of plasma membrane involved in coordinating signal transduction in various organ systems. While caveolin-1 (Cav-1) has been shown to regulate lymphocyte activation, the role of caveolin-3 (Cav-3) in immune system signaling has not been investigated. We tested the hypothesis that Cav-3 modulates lymphocyte activation. MAIN METHODS Lymphocyte/leukocyte subpopulations from WT and Cav-3 mice were profiled with flow cytometry. Cytokine production in quiescent and activated splenocytes from WT and Cav-3 mice was assessed with ELISA. KEY FINDINGS Levels of T-cells, monocytes, and natural killer cells were not different between WT and KO mice, however KO mice had lower B-cell population-percentage. Functionally, activated lymphocytes from Cav-3 KO mice demonstrated significantly reduced expression of IL-2 compared to WT, while expression of TNFα, IL-6, and IL-10 was not different. Finally, expression of IL-17 was significantly reduced in T-helper cells from KO mice, while IFNγ was not, suggesting that Cav-3 is a determinant in the development of the Th-17 subpopulation. SIGNIFICANCE This study is the first to demonstrate that Cav-3 may be a novel participant in B-cell expression, T-cell cytokine production and activation of inflammation.
Collapse
|
24
|
Fettucciari K, Ponsini P, Palumbo C, Rosati E, Mannucci R, Bianchini R, Modesti A, Marconi P. Macrophage induced gelsolin in response to Group BStreptococcus(GBS) infection. Cell Microbiol 2014; 17:79-104. [DOI: 10.1111/cmi.12338] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 07/04/2014] [Accepted: 07/31/2014] [Indexed: 12/20/2022]
Affiliation(s)
- Katia Fettucciari
- Department of Experimental Medicine; Perugia University; Perugia Italy
| | - Pamela Ponsini
- Department of Experimental Medicine; Perugia University; Perugia Italy
| | - Camilla Palumbo
- Department of Clinical Sciences and Translational Medicine; Tor Vergata University; Rome Italy
| | - Emanuela Rosati
- Department of Experimental Medicine; Perugia University; Perugia Italy
| | - Roberta Mannucci
- Department of Medicine, Laboratory of Image Analysis; Perugia University; Perugia Italy
| | - Rodolfo Bianchini
- Research Program for Receptor Biochemistry and Tumor Metabolism; Laura Bassi Centre of Expertise Therapep; Salzburg University Clinic; Salzburg Austria
- Department of Pediatrics; Paracelsus Medical University; Muellner Hauptstrasse Salzburg Austria
| | - Andrea Modesti
- Department of Clinical Sciences and Translational Medicine; Tor Vergata University; Rome Italy
| | | |
Collapse
|
25
|
Yang G, Xu H, Li Z, Li F. Interactions of caveolin-1 scaffolding and intramembrane regions containing a CRAC motif with cholesterol in lipid bilayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:2588-99. [PMID: 24998359 DOI: 10.1016/j.bbamem.2014.06.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 06/13/2014] [Accepted: 06/22/2014] [Indexed: 11/27/2022]
Abstract
Caveolin-1 is a major structural protein of caveolae and specifically binds cholesterol (Chol). The caveolin scaffolding domain is thought to be involved in caveolin-Chol interaction through the sequence V94-T-K-Y-W-F-Y-R101, a motif that matches a cholesterol recognition amino-acid consensus (CRAC). In the present work, three CRAC-containing peptides, corresponding to caveolin-1 94-101, 82-101 and 93-126, were tested to study the role of the CRAC motif in the caveolin-Chol interaction in 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) bilayers using differential scanning calorimetry (DSC), fluorescence and circular dichroism (CD). The Y97I substituents of the three peptides and one peptide segment corresponding to caveolin-1 101-126 that excludes the CRAC motif were also tested for comparison. Our results showed the potency of these CRAC-containing peptides in sequestering Chol into domains and the enhanced role of the intramembrane domain and scaffolding domain for the potency. Of the three CRAC-containing peptides, the peptide 93-126 was particularly effective in promoting Chol segregation, while the peptide 82-101 was less potent in promoting the formation of domains than the peptide 93-126, but was more potent than the peptide 94-101. The domain partition of DPPC/Chol bilayers was not observed in the presence of the peptide 101-126, in contrast to the case in the presence of the peptide 93-126 at the same concentrations of peptide and Chol. The potency of the CRAC motif in Chol segregation was lowered by the Y97I mutation. The difference in structure may be a factor that contributes to different effects of these peptides on the distribution of Chol in the lipid membrane.
Collapse
Affiliation(s)
- Guanhua Yang
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, 130012, PR China
| | - Haoran Xu
- Key Laboratory for Molecular Enzymology & Engineering, The Ministry of Education, Jilin University, Changchun 130012, PR China
| | - Zhengqiang Li
- Key Laboratory for Molecular Enzymology & Engineering, The Ministry of Education, Jilin University, Changchun 130012, PR China
| | - Fei Li
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, 130012, PR China.
| |
Collapse
|
26
|
Sekiya M, Yamamuro D, Ohshiro T, Honda A, Takahashi M, Kumagai M, Sakai K, Nagashima S, Tomoda H, Igarashi M, Okazaki H, Yagyu H, Osuga JI, Ishibashi S. Absence of Nceh1 augments 25-hydroxycholesterol-induced ER stress and apoptosis in macrophages. J Lipid Res 2014; 55:2082-92. [PMID: 24891333 DOI: 10.1194/jlr.m050864] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
An excess of cholesterol and/or oxysterols induces apoptosis in macrophages, contributing to the development of advanced atherosclerotic lesions. In foam cells, these sterols are stored in esterified forms, which are hydrolyzed by two enzymes: neutral cholesterol ester hydrolase 1 (Nceh1) and hormone-sensitive lipase (Lipe). A deficiency in either enzyme leads to accelerated growth of atherosclerotic lesions in mice. However, it is poorly understood how the esterification and hydrolysis of sterols are linked to apoptosis. Remarkably, Nceh1-deficient thioglycollate-elicited peritoneal macrophages (TGEMs), but not Lipe-deficient TGEMs, were more susceptible to apoptosis induced by oxysterols, particularly 25-hydroxycholesterol (25-HC), and incubation with 25-HC caused massive accumulation of 25-HC ester in the endoplasmic reticulum (ER) due to its defective hydrolysis, thereby activating ER stress signaling such as induction of CCAAT/enhancer-binding protein-homologous protein (CHOP). These changes were nearly reversed by inhibition of ACAT1. In conclusion, deficiency of Nceh1 augments 25-HC-induced ER stress and subsequent apoptosis in TGEMs. In addition to reducing the cholesteryl ester content of foam cells, Nceh1 may protect against the pro-apoptotic effect of oxysterols and modulate the development of atherosclerosis.
Collapse
Affiliation(s)
- Motohiro Sekiya
- Departments of Diabetes and Metabolic Diseases, University of Tokyo, Tokyo 113-8655, Japan
| | - Daisuke Yamamuro
- Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan
| | - Taichi Ohshiro
- Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan
| | - Akira Honda
- Joint Research Center, Tokyo Medical University Ibaraki Medical Center, Ibaraki 300-0395, Japan
| | - Manabu Takahashi
- Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan
| | - Masayoshi Kumagai
- Departments of Diabetes and Metabolic Diseases, University of Tokyo, Tokyo 113-8655, Japan
| | - Kent Sakai
- Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan
| | - Shuichi Nagashima
- Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan
| | - Hiroshi Tomoda
- Department of Microbial Chemistry, Graduate School of Pharmaceutical Sciences, Kitasato University, Tokyo 108-8641, Japan
| | - Masaki Igarashi
- Departments of Diabetes and Metabolic Diseases, University of Tokyo, Tokyo 113-8655, Japan
| | - Hiroaki Okazaki
- Departments of Diabetes and Metabolic Diseases, University of Tokyo, Tokyo 113-8655, Japan
| | - Hiroaki Yagyu
- Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan
| | - Jun-ichi Osuga
- Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan
| | - Shun Ishibashi
- Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan
| |
Collapse
|
27
|
Akbar H, Cardoso FC, Meier S, Burke C, McDougall S, Mitchell M, Walker C, Rodriguez-Zas SL, Everts RE, Lewin HA, Roche JR, Loor JJ. Postpartal subclinical endometritis alters transcriptome profiles in liver and adipose tissue of dairy cows. Bioinform Biol Insights 2014; 8:45-63. [PMID: 24578603 PMCID: PMC3934763 DOI: 10.4137/bbi.s13735] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 12/17/2013] [Accepted: 12/17/2013] [Indexed: 12/11/2022] Open
Abstract
Transcriptome alterations in liver and adipose tissue of cows with subclinical endometritis (SCE) at 29 d postpartum were evaluated. Bioinformatics analysis was performed using the Dynamic Impact Approach by means of KEGG and DAVID databases. Milk production, blood metabolites (non-esterified fatty acids, magnesium), and disease biomarkers (albumin, aspartate aminotransferase) did not differ greatly between healthy and SCE cows. In liver tissue of cows with SCE, alterations in gene expression revealed an activation of complement and coagulation cascade, steroid hormone biosynthesis, apoptosis, inflammation, oxidative stress, MAPK signaling, and the formation of fibrinogen complex. Bioinformatics analysis also revealed an inhibition of vitamin B3 and B6 metabolism with SCE. In adipose, the most activated pathways by SCE were nicotinate and nicotinamide metabolism, long-chain fatty acid transport, oxidative phosphorylation, inflammation, T cell and B cell receptor signaling, and mTOR signaling. Results indicate that SCE in dairy cattle during early lactation induces molecular alterations in liver and adipose tissue indicative of immune activation and cellular stress.
Collapse
Affiliation(s)
- Haji Akbar
- Department of Animal Sciences, University of Illinois, Urbana, Illinois, USA
| | - Felipe C. Cardoso
- Department of Animal Sciences, University of Illinois, Urbana, Illinois, USA
| | | | | | | | - Murray Mitchell
- Liggins Institute, University of Auckland, Auckland, New Zealand
- University of Queensland Centre for Clinical Research, Brisbane, St. Lucia, Queensland, Australia
| | | | | | - Robin E. Everts
- Department of Animal Sciences, University of Illinois, Urbana, Illinois, USA
| | - Harris A. Lewin
- Department of Animal Sciences, University of Illinois, Urbana, Illinois, USA
| | | | - Juan J. Loor
- Department of Animal Sciences, University of Illinois, Urbana, Illinois, USA
- Division of Nutritional Sciences, University of Illinois, Urbana, Illinois, USA
| |
Collapse
|
28
|
Lin S, Nadeau PE, Wang X, Mergia A. Caveolin-1 reduces HIV-1 infectivity by restoration of HIV Nef mediated impairment of cholesterol efflux by apoA-I. Retrovirology 2012; 9:85. [PMID: 23067370 PMCID: PMC3487900 DOI: 10.1186/1742-4690-9-85] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 09/26/2012] [Indexed: 11/12/2022] Open
Abstract
Background HIV infection results in inhibited cholesterol efflux by apolipoprotein A-I (apoA-I) in macrophages, and this impairment involves Nef mediated down-regulation and redistribution of ATP-binding cassette transporter A1 (ABCA-1). We investigated the effect of caveolin-1 (Cav-1) on the cholesterol efflux by apoA-I in HIV infected primary and THP-1 cell-differentiated macrophages as well as astrocyte derived glioblastoma U87 cells. Results Our results reveal that Cav-1 restores the Nef -mediated impairment of cholesterol efflux by apoA-I in both cell types. Co-immunoprecipitation studies indicate a physical association of Cav-1 and Nef. The level of ABCA-1 expression remains the same whether Cav-1 is over-expressed or not. In addition, we examined the cholesterol composition of HIV particles released from Cav-1 treated cells and identified that the cholesterol content is dramatically reduced. The infectivity level of these virus particles is also significantly decreased. Conclusions These observations suggest that the interplay of Cav-1 with Nef and cholesterol subsequently counters Nef induced impairment of cholesterol efflux by apoA-l. The findings provide a cellular mechanism by which Cav-1 has an ability to restore HIV mediated impairment of cholesterol efflux in macrophages. This subsequently influences the cholesterol content incorporated into virus particles thereby inhibiting HIV infectivity and contributing to HIV’s persistent infection of macrophages.
Collapse
Affiliation(s)
- Shanshan Lin
- Department of Infectious Disease and Pathology, University of Florida, Gainesville, Florida, 32611, USA
| | | | | | | |
Collapse
|
29
|
Oskvig DB, Elkahloun AG, Johnson KR, Phillips TM, Herkenham M. Maternal immune activation by LPS selectively alters specific gene expression profiles of interneuron migration and oxidative stress in the fetus without triggering a fetal immune response. Brain Behav Immun 2012; 26:623-34. [PMID: 22310921 PMCID: PMC3285385 DOI: 10.1016/j.bbi.2012.01.015] [Citation(s) in RCA: 172] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Revised: 01/12/2012] [Accepted: 01/20/2012] [Indexed: 01/07/2023] Open
Abstract
Maternal immune activation (MIA) is a risk factor for the development of schizophrenia and autism. Infections during pregnancy activate the mother's immune system and alter the fetal environment, with consequential effects on CNS function and behavior in the offspring, but the cellular and molecular links between infection-induced altered fetal development and risk for neuropsychiatric disorders are unknown. We investigated the immunological, molecular, and behavioral effects of MIA in the offspring of pregnant Sprague-Dawley rats given an intraperitoneal (0.25 mg/kg) injection of lipopolysaccharide (LPS) on gestational day 15. LPS significantly elevated pro-inflammatory cytokine levels in maternal serum, amniotic fluid, and fetal brain at 4 h, and levels decreased but remained elevated at 24 h. Offspring born to LPS-treated dams exhibited reduced social preference and exploration behaviors as juveniles and young adults. Whole genome microarray analysis of the fetal brain at 4 h post maternal LPS was performed to elucidate the possible molecular mechanisms by which MIA affects the fetal brain. We observed dysregulation of 3285 genes in restricted functional categories, with increased mRNA expression of cellular stress and cell death genes and reduced expression of developmentally-regulated and brain-specific genes, specifically those that regulate neuronal migration of GABAergic interneurons, including the Distal-less (Dlx) family of transcription factors required for tangential migration from progenitor pools within the ganglionic eminences into the cerebral cortex. Our results provide a novel mechanism by which MIA induces the widespread down-regulation of critical neurodevelopmental genes, including those previously associated with autism.
Collapse
Affiliation(s)
- Devon B. Oskvig
- Section on Functional Neuroanatomy, National Institute of Mental Health, NIH, Bethesda, MD 20892, USA
| | - Abdel G. Elkahloun
- Division of Intramural Research Programs Microarray Core Facility, NIH, Bethesda, MD, 20892 USA
| | - Kory R. Johnson
- Bioinformatics Section, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, MD, 20892 USA
| | - Terry M. Phillips
- Ultramicro Immunodiagnostics Section, Laboratory of Bioengineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, MD, 20892, USA
| | - Miles Herkenham
- Section on Functional Neuroanatomy, National Institute of Mental Health, NIH, Bethesda, MD 20892, USA,Corresponding Author: Address: Bldg. 35, Rm. 1C913, Bethesda, MD 20892-3724, USA. (M. Herkenham)
| |
Collapse
|
30
|
Wu HY, Goble K, Mecha M, Wang CC, Huang CH, Guaza C, Jan TR. Cannabidiol-induced apoptosis in murine microglial cells through lipid raft. Glia 2012; 60:1182-90. [DOI: 10.1002/glia.22345] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Accepted: 03/30/2012] [Indexed: 01/22/2023]
|
31
|
Atherosclerosis, caveolae and caveolin-1. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 729:127-44. [PMID: 22411318 DOI: 10.1007/978-1-4614-1222-9_9] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Atherosclerosis is a disease of the blood vessel characterized by the development of an arterial occlusion containing lipid and cellular deposits. Caveolae are 50-100 nm cell surface plasma membrane invaginations that are believed to play an important role in the regulation of cellular signaling and transport of molecules among others. These organelles are enriched in sphingolipids and cholesterol and are characterized by the presence of the protein caveolin-1. Caveolin-1 and caveolae are present in most of the cells involved in the development of atherosclerosis. The current literature suggests a rather complex role for caveolin-1 in this disease, with evidence of either pro- or anti-atherogenic functions depending on the cell type examined. In the present chapter, the various roles of caveolae and caveolin-1 in the development of atherosclerosis are examined.
Collapse
|
32
|
Engel D, Beckers L, Wijnands E, Seijkens T, Lievens D, Drechsler M, Gerdes N, Soehnlein O, Daemen MJAP, Stan RV, Biessen EAL, Lutgens E. Caveolin-1 deficiency decreases atherosclerosis by hampering leukocyte influx into the arterial wall and generating a regulatory T-cell response. FASEB J 2011; 25:3838-48. [PMID: 21795505 DOI: 10.1096/fj.11-183350] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Caveolin-1 plays a crucial role in atherosclerosis, which is mainly attributed to its effects on low-density-lipoprotein (LDL) transcytosis. However, caveolin-1 has also been implicated in the regulation of inflammation. We investigated the effects of caveolin-1 deficiency in atherosclerosis with its accompanying changes in plaque- and lymphoid-related immunology and inflammation. Cav1(-/-)Apoe(-/-) mice exhibited a 15-fold reduction in plaque size with plaques containing fewer macrophages, T cells, and neutrophils. Intravital microscopy revealed 83% less leukocyte adhesion to the vessel wall in Cav1(-/-)Apoe(-/-) mice, which could be attributed to reduced endothelial chemokine ligand-2 (CCL-2/MCP-1) and vascular cell adhesion molecule-1 (VCAM-1) expression. Caveolin-1 deficiency resulted in a 57% increase in regulatory T cells and a 4% decrease in CD4(+) effector T cells in lymphoid organs. Bone marrow transplantations revealed that Cav1(-/-)Apoe(-/-) mice receiving Cav1(+/+)Apoe(-/-) or Cav1(-/-)Apoe(-/-) bone marrow presented 4- to 4.5-fold smaller plaques with no additional phenotypic changes. In contrast, atherosclerosis was not affected in Cav1(+/+) Apoe(-/-) recipients receiving Cav1(-/-)Apoe(-/-) or Cav1(+/+) Apoe(-/-) bone marrow. However, the presence of Cav1(-/-) Apoe(-/-) bone marrow was associated with an anti-inflammatory T-cell profile. Our study reveals that nonhematopoietic caveolin-1 determines plaque size, whereas hematopoietic caveolin-1 regulates lymphoid immune-modulation. However, both are required for phenotypic modulation of plaques.
Collapse
Affiliation(s)
- David Engel
- Department of Pathology, Cardiovascular Research Institute Maastricht, University Maastricht, P. Debyelaan 25, 6229 HX Maastricht, The Netherlands.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Dasanayake D, Richaud M, Cyr N, Caballero-Franco C, Pittroff S, Finn RM, Ausió J, Luo W, Donnenberg MS, Jardim A. The N-terminal amphipathic region of the Escherichia coli type III secretion system protein EspD is required for membrane insertion and function. Mol Microbiol 2011; 81:734-50. [PMID: 21651628 DOI: 10.1111/j.1365-2958.2011.07727.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Enterohemorrhagic Escherichia coli is a causative agent of gastrointestinal and diarrheal diseases. These pathogenic E. coli express a syringe-like protein machine, known as the type III secretion system (T3SS), used for the injection of virulence factors into the cytosol of the host epithelial cell. Breaching the epithelial plasma membrane requires formation of a translocation pore that contains the secreted protein EspD. Here we demonstrate that the N-terminal segment of EspD, encompassing residues 1-171, contains two amphipathic domains spanning residues 24-41 and 66-83, with the latter of these helices being critical for EspD function. Fluorescence and circular dichroism analysis revealed that, in solution, His₆-EspD₁₋₁₇₁ adopts a native disordered structure; however, on binding anionic small unilamellar vesicles composed of phosphatidylserine, His₆-EspD₁₋₁₇₁ undergoes a pH depended conformational change that increases the α-helix content of this protein approximately sevenfold. This change coincides with insertion of the region circumscribing Trp₄₇ into the hydrophobic core of the lipid bilayer. On the HeLa cell plasma membrane, His₆-EspD₁₋₁₇₁ forms a homodimer that is postulated to promote EspD-EspD oligomerization and pore formation. Complementation of ΔespD null mutant bacteria with an espDΔ66-83 gene showed that this protein was secreted but non-functional.
Collapse
Affiliation(s)
- Dayal Dasanayake
- Institute of Parasitology and Centre for Host-Parasite Interactions, Macdonald Campus of McGill University, Ste-Anne-de-Bellevue, Québec H9X3V9, Canada
| | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Fazliana M, Ramos NL, Lüthje P, Sekikubo M, Holm A, Wan Nazaimoon WM, Brauner A. Labisia pumila var. alata reduces bacterial load by inducing uroepithelial cell apoptosis. JOURNAL OF ETHNOPHARMACOLOGY 2011; 136:111-116. [PMID: 21524700 DOI: 10.1016/j.jep.2011.04.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 04/05/2011] [Accepted: 04/09/2011] [Indexed: 05/30/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Labisia pumila var. alata (LPva) is a traditional medicinal herb used by Malaysian women to treat many ailments of the genitourinary tract. Its phytoestrogenic properties suggest potential to prevent recurrent urinary tract infection (UTI) in women post menopause. The aim of this study was therefore to investigate the mechanisms of action of LPva in an in vitro model of UTI. MATERIALS AND METHODS Bladder epithelial cell lines T24 and 5637 and uropathogenic Escherichia coli (UPEC) strain CFT073 were used to model uroepithelial infection. The ability of LPva to induce programmed cell death was tested using the Annexin-V-FLUOS and TUNEL assays. Expression of caveolin-1, β1 integrin and antimicrobial peptides HBD-2 and LL-37 in response to LPva treatment and/or infection, was assessed using RT real-time PCR. Effects on protein expression were confirmed by Western blot analysis. Sensitivity and yeast agglutination assays were employed to determine if LPva had antimicrobial activities and/or interacted with type 1 fimbriae, respectively. Finally, bacterial adherence and invasion to cells treated with LPva was examined. RESULTS LPva induced uroepithelial apoptosis which was coupled with upregulated expression of caveolin-1 and downregulation of β1 integrin. LPva did not exhibit direct antimicrobial properties and did not influence antimicrobial peptide levels in cells. Additionally, LPva did not interact with type 1 fimbriae and did not affect adherence in comparison to non-treated control cells. However, LPva significantly reduced the number of intracellular UPEC in bladder epithelial cells. CONCLUSIONS Our findings suggest that LPva has beneficial applications against UPEC infection due to its ability to induce programmed cell death and reduce bacterial invasion of the uroepithelium.
Collapse
Affiliation(s)
- Mansor Fazliana
- Department of Microbiology, Tumour and Cell Biology, Division of Clinical Microbiology, Karolinska Institutet and Karolinska University Hospital, S-171 76 Stockholm, Sweden
| | | | | | | | | | | | | |
Collapse
|
35
|
Cell-specific dual role of caveolin-1 in pulmonary hypertension. Pulm Med 2011; 2011:573432. [PMID: 21660237 PMCID: PMC3109422 DOI: 10.1155/2011/573432] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2011] [Accepted: 03/10/2011] [Indexed: 12/15/2022] Open
Abstract
A wide variety of cardiopulmonary and systemic diseases are known to lead to pulmonary hypertension (PH). A number of signaling pathways have been implicated in PH; however, the precise mechanism/s leading to PH is not yet clearly understood. Caveolin-1, a membrane scaffolding protein found in a number of cells including endothelial and smooth muscle cells, has been implicated in PH. Loss of endothelial caveolin-1 is reported in clinical and experimental forms of PH. Caveolin-1, also known as a tumor-suppressor factor, interacts with a number of transducing molecules that reside in or are recruited to caveolae, and it inhibits cell proliferative pathways. Not surprisingly, the rescue of endothelial caveolin-1 has been found not only to inhibit the activation of proliferative pathways but also to attenuate PH. Recently, it has emerged that during the progression of PH, enhanced expression of caveolin-1 occurs in smooth muscle cells, where it facilitates cell proliferation, thus contributing to worsening of the disease. This paper summarizes the cell-specific dual role of caveolin-1 in PH.
Collapse
|
36
|
Zhu XD, Zhuang Y, Ben JJ, Qian LL, Huang HP, Bai H, Sha JH, He ZG, Chen Q. Caveolae-dependent endocytosis is required for class A macrophage scavenger receptor-mediated apoptosis in macrophages. J Biol Chem 2011; 286:8231-8239. [PMID: 21205827 DOI: 10.1074/jbc.m110.145888] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
SR-A (class A macrophage scavenger receptor) is a transmembrane receptor that can bind many different ligands, including modified lipoproteins that are relevant to the development of vascular diseases. However, the precise endocytic pathways of SR-A/mediated ligands internalization are not fully characterized. In this study, we show that the SR-A/ligand complex can be endocytosed by both clathrin- and caveolae-dependent pathways. Internalizations of SR-A-lipoprotein (such as acLDL) complexes primarily go through clathrin-dependent endocytosis. In contrast, macrophage apoptosis triggered by SR-A-fucoidan internalization requires caveolae-dependent endocytosis. The caveolae-dependent process activates p38 kinase and JNK signaling, whereas the clathrin-mediated endocytosis elicits ERK signaling. Our results suggest that different SR-A endocytic pathways have distinct functional consequences due to the activation of different signaling cascades in macrophages.
Collapse
Affiliation(s)
- Xu-Dong Zhu
- From the Institute of Reproductive Medicine and; Atherosclerosis Research Center, Key Laboratory of Human Functional Genomics, Nanjing Medical University, Nanjing 210029, China and
| | - Yan Zhuang
- Atherosclerosis Research Center, Key Laboratory of Human Functional Genomics, Nanjing Medical University, Nanjing 210029, China and
| | - Jing-Jing Ben
- Atherosclerosis Research Center, Key Laboratory of Human Functional Genomics, Nanjing Medical University, Nanjing 210029, China and
| | - Ling-Ling Qian
- Atherosclerosis Research Center, Key Laboratory of Human Functional Genomics, Nanjing Medical University, Nanjing 210029, China and
| | - Han-Peng Huang
- Atherosclerosis Research Center, Key Laboratory of Human Functional Genomics, Nanjing Medical University, Nanjing 210029, China and
| | - Hui Bai
- Atherosclerosis Research Center, Key Laboratory of Human Functional Genomics, Nanjing Medical University, Nanjing 210029, China and
| | - Jia-Hao Sha
- From the Institute of Reproductive Medicine and
| | - Zhi-Gang He
- the Division of Neuroscience, Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115
| | - Qi Chen
- From the Institute of Reproductive Medicine and; Atherosclerosis Research Center, Key Laboratory of Human Functional Genomics, Nanjing Medical University, Nanjing 210029, China and.
| |
Collapse
|
37
|
Daxx Mediates Oxidized Low-density Lipoprotein-Induced Cholesterol Accumulation and Apoptosis in Macrophages by Upregulating Caveolin-1 Expression*. PROG BIOCHEM BIOPHYS 2010. [DOI: 10.3724/sp.j.1206.2010.00153] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
38
|
Abstract
Caveolin 1 (Cav-1) is a major protein of a specific membrane lipid raft known as caveolae. Cav-1 interacts with the gp41 of the human immunodeficiency virus (HIV) envelope, but the role of Cav-1 in HIV replication and pathogenesis is not known. In this report, we demonstrate that HIV infection in primary human monocyte-derived macrophages (MDMs), THP-1 macrophages, and U87-CD4 cells results in a dramatic upregulation of Cav-1 expression mediated by HIV Tat. The activity of p53 is essential for Tat-induced Cav-1 expression, as our findings show enhanced phosphorylation of serine residues at amino acid positions 15 and 46 in the presence of Tat with a resulting Cav-1 upregulation. Furthermore, inhibition of p38 mitogen-activated protein kinase (MAPK) blocked phosphorylation of p53 in the presence of Tat. Infection studies of Cav-1-overexpressing cells reveal a significant reduction of HIV production. Taken together, these results suggest that HIV infection enhances the expression of Cav-1, which subsequently causes virus reduction, suggesting that Cav-1 may contribute to persistent infection in macrophages.
Collapse
|
39
|
Frank PG. Endothelial caveolae and caveolin-1 as key regulators of atherosclerosis. THE AMERICAN JOURNAL OF PATHOLOGY 2010; 177:544-6. [PMID: 20581059 DOI: 10.2353/ajpath.2010.100247] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
This commentary discusses the role of caveolin-1 in atherosclerosis.
Collapse
Affiliation(s)
- Philippe G Frank
- Kimmel Cancer Center, Department of Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA.
| |
Collapse
|
40
|
Xu Y, Krause A, Hamai H, Harvey BG, Worgall TS, Worgall S. Proinflammatory phenotype and increased caveolin-1 in alveolar macrophages with silenced CFTR mRNA. PLoS One 2010; 5:e11004. [PMID: 20543983 PMCID: PMC2882373 DOI: 10.1371/journal.pone.0011004] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Accepted: 05/15/2010] [Indexed: 11/18/2022] Open
Abstract
The inflammatory milieu in the respiratory tract in cystic fibrosis (CF) has been linked to the defective expression of the cystic transmembrane regulator (CFTR) in epithelial cells. Alveolar macrophages (AM), important contibutors to inflammatory responses in the lung, also express CFTR. The present study analyzes the phenotype of human AM with silenced CFTR. Expression of CFTR mRNA and the immature form of the CFTR protein decreased 100-fold and 5.2-fold, respectively, in AM transfected with a CFTR specific siRNA (CFTR-siRNA) compared to controls. Reduction of CFTR expression in AM resulted in increased secretion of IL-8, increased phosphorylation of NF-κB, a positive regulator of IL-8 expression, and decreased expression of IκB-α, the inhibitory protein of NF-κB activation. AM with silenced CFTR expression also showed increased apoptosis. We hypothesized that caveolin-1 (Cav1), a membrane protein that is co-localized with CFTR in lipid rafts and that is related to inflammation and apoptosis in macrophages, may be affected by decreased CFTR expression. Messenger RNA and protein levels of Cav1 were increased in AM with silenced CFTR. Expression and transcriptional activity of sterol regulatory element binding protein (SREBP), a negative transcriptional regulator of Cav1, was decreased in AM with silenced CFTR, but total and free cholesterol mass did not change. These findings indicate that silencing of CFTR in human AM results in an inflammatory phenotype and apoptosis, which is associated to SREBP-mediated regulation of Cav1.
Collapse
Affiliation(s)
- Yaqin Xu
- Department of Pediatrics, Weill Cornell Medical College, New York, New York, United States of America
| | - Anja Krause
- Department of Genetic Medicine, Weill Cornell Medical College, New York, New York, United States of America
| | - Hiroko Hamai
- Department of Pathology, Columbia University, New York, New York, United States of America
| | - Ben-Gary Harvey
- Department of Genetic Medicine, Weill Cornell Medical College, New York, New York, United States of America
| | - Tilla S. Worgall
- Department of Pathology, Columbia University, New York, New York, United States of America
| | - Stefan Worgall
- Department of Pediatrics, Weill Cornell Medical College, New York, New York, United States of America
- Department of Genetic Medicine, Weill Cornell Medical College, New York, New York, United States of America
- * E-mail:
| |
Collapse
|
41
|
Ifere GO, Equan A, Gordon K, Nagappan P, Igietseme JU, Ananaba GA. Cholesterol and phytosterols differentially regulate the expression of caveolin 1 and a downstream prostate cell growth-suppressor gene. Cancer Epidemiol 2010; 34:461-71. [PMID: 20466611 DOI: 10.1016/j.canep.2010.04.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2008] [Revised: 04/10/2010] [Accepted: 04/12/2010] [Indexed: 01/18/2023]
Abstract
BACKGROUND The purpose of our study was to show the distinction between the apoptotic and anti-proliferative signaling of phytosterols and cholesterol-enrichment in prostate cancer cell lines, mediated by the differential transcription of caveolin-1, and N-myc downstream-regulated gene 1 (NDRG1), a pro-apoptotic androgen-regulated tumor suppressor. METHODS PC-3 and DU145 cells were treated with sterols (cholesterol and phytosterols) for 72h, followed by trypan blue dye-exclusion measurement of necrosis and cell growth measured with a Coulter counter. Sterol induction of cell growth-suppressor gene expression was evaluated by mRNA transcription using RT-PCR, while cell cycle analysis was performed by FACS analysis. Altered expression of Ndrg1 protein was confirmed by Western blot analysis. Apoptosis was evaluated by real time RT-PCR amplification of P53, Bcl-2 gene and its related pro- and anti-apoptotic family members. RESULTS Physiological doses (16microM) of cholesterol and phytosterols were not cytotoxic in these cells. Cholesterol-enrichment promoted cell growth (P<0.05), while phytosterols significantly induced growth-suppression (P<0.05) and apoptosis. Cell cycle analysis showed that contrary to cholesterol, phytosterols decreased mitotic subpopulations. We demonstrated for the first time that cholesterols concertedly attenuated the expression of caveolin-1 (cav-1) and NDRG1 genes in both prostate cancer cell lines. Phytosterols had the opposite effect by inducing overexpression of cav-1, a known mediator of androgen-dependent signals that presumably control cell growth or apoptosis. CONCLUSIONS Cholesterol and phytosterol treatment differentially regulated the growth of prostate cancer cells and the expression of p53 and cav-1, a gene that regulates androgen-regulated signals. These sterols also differentially regulated cell cycle arrest, downstream pro-apoptotic androgen-regulated tumor suppressor, NDRG1 suggesting that cav-1 may mediate pro-apoptotic NDRG1 signals. Elucidation of the mechanism for sterol modulation of growth and apoptosis signaling may reveal potential targets for cancer prevention and/or chemotherapeutic intervention. Sterol regulation of NDRG1 transcription suggests its potential as biomarker for prediction of neoplasms that would be responsive to chemoprevention by phytosterols.
Collapse
Affiliation(s)
- Godwin O Ifere
- Department of Biological Sciences, Clark Atlanta University, Atlanta, GA 30314, USA.
| | | | | | | | | | | |
Collapse
|
42
|
Jaureguiberry MS, Tricerri MA, Sanchez SA, Garda HA, Finarelli GS, Gonzalez MC, Rimoldi OJ. Membrane organization and regulation of cellular cholesterol homeostasis. J Membr Biol 2010; 234:183-94. [PMID: 20336284 DOI: 10.1007/s00232-010-9245-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Accepted: 03/04/2010] [Indexed: 12/11/2022]
Abstract
An excess of intracellular free cholesterol (Chol) is cytotoxic, and its homeostasis is crucial for cell viability. Apolipoprotein A-I (apoA-I) is a highly efficient Chol acceptor because it activates complex cellular pathways that tend to mobilize and export Chol from cellular depots. We hypothesize that membrane composition and/or organization is strongly involved in Chol homeostasis. To test this hypothesis, we constructed a cell line overexpressing stearoyl coenzyme A (CoA) desaturase (SCD cells), which modifies plasma membrane (PM) composition by the enrichment of monounsaturated fatty acids, and determined this effect on membrane properties, cell viability, and Chol homeostasis. PM in SCD cells has a higher ratio of phospholipids to sphingomyelin and is slightly enriched in Chol. These cells showed an increase in the ratio of cholesteryl esters to free Chol; they were more resistant to Chol toxicity, and they exported more caveolin than control cells. The data suggest that cell functionality is preserved by regulating membrane fluidity and Chol exportation and storage.
Collapse
Affiliation(s)
- María S Jaureguiberry
- Instituto de Investigaciones Bioquímicas de La Plata, CONICET/UNLP, Facultad de Ciencias Médicas, Calles 60 y 120, La Plata 1900, Buenos Aires, Argentina
| | | | | | | | | | | | | |
Collapse
|
43
|
Kim WY, Chang DJ, Hennessy B, Kang HJ, Yoo J, Han SH, Kim YS, Park HJ, Geo SY, Mills G, Kim KW, Hong WK, Suh YG, Lee HY, Lee HY. A novel derivative of the natural agent deguelin for cancer chemoprevention and therapy. Cancer Prev Res (Phila) 2008; 1:577-87. [PMID: 19139008 PMCID: PMC2738643 DOI: 10.1158/1940-6207.capr-08-0184] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The natural compound deguelin has promising preventive and therapeutic activity against diverse cancers by directly binding to heat shock protein-90 and thus suppressing its function. Potential side effects of deguelin over a certain dose, however, could be a substantial obstacle to its clinical use. To develop a derivative(s) of deguelin with reduced potential side effects, we synthesized five deguelin analogues (SH-02, SH-03, SH-09, SH-14, and SH-15) and compared them with the parent compound and each other for structural and biochemical features; solubility; and antiproliferative effects on normal, premalignant, and malignant human bronchial epithelial (HBE) and non-small-cell lung cancer (NSCLC) cell lines. Four derivatives destabilized hypoxia-inducible factor-1alpha as potently as did deguelin. Reverse-phase protein array (RPPA) analysis in H460 NSCLC cells revealed that deguelin and the derivatives suppressed expression of a number of proteins including heat shock protein-90 clients and proteins involved in the phosphoinositide 3-kinase/Akt pathway. One derivative, SH-14, showed several features of potential superiority for clinical use: the highest apoptotic activity; no detectable influence on Src/signal transducer and activator of transcription signaling, which can promote cancer progression and is closely related to pathogenesis of Parkinson's disease (deguelin, SH-02 and SH-03 strongly activated this signaling); better aqueous solubility; and less cytotoxicity to immortalized HBE cells (versus deguelin) at a dose (1 micromol/L) that induced apoptotic activity in most premalignant and malignant HBE and NSCLC cell lines. These collective results suggest that the novel derivative SH-14 has strong potential for cancer chemoprevention and therapy, with equivalent efficacy and lesser toxicity (versus deguelin).
Collapse
Affiliation(s)
- Woo-Young Kim
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Dong Jo Chang
- College of Pharmacy, Seoul National University, Seoul, Korea
| | - Bryan Hennessy
- Departments of System Biology and Gynecologic Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Hae-Jin Kang
- College of Pharmacy, Seoul National University, Seoul, Korea
| | - Jakyung Yoo
- College of Pharmacy, Sungkyunkwan University, Suwon, Korea
| | - Seung-Ho Han
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Yoo-Shin Kim
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Hyun-Ju Park
- College of Pharmacy, Sungkyunkwan University, Suwon, Korea
| | | | - Gordon Mills
- Departments of System Biology and Gynecologic Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Kyu-Won Kim
- College of Pharmacy, Seoul National University, Seoul, Korea
| | - Waun Ki Hong
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Young-Ger Suh
- College of Pharmacy, Seoul National University, Seoul, Korea
| | - Ho-Young Lee
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | | |
Collapse
|
44
|
Wu P, Wang X, Li F, Qi B, Zhu H, Liu S, Cui Y, Chen J. Growth suppression of MCF-7 cancer cell-derived xenografts in nude mice by caveolin-1. Biochem Biophys Res Commun 2008; 376:215-20. [PMID: 18778685 DOI: 10.1016/j.bbrc.2008.08.146] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2008] [Accepted: 08/26/2008] [Indexed: 12/26/2022]
Abstract
Caveolin-1 is an essential structural constituent of caveolae membrane domains that has been implicated in mitogenic signaling and oncogenesis. However, the exact functional role of caveolin-1 still remains controversial. In this report, utilizing MCF-7 human breast adenocarcinoma cells stably transfected with caveolin-1 (MCF-7/cav-1 cells), we demonstrate that caveolin-1 expression dramatically inhibits invasion and migration of these cells. Importantly, in vivo experiments employing xenograft tumor models demonstrated that expression of caveolin-1 results in significant growth inhibition of breast tumors. Moreover, a dramatic delay in tumor progression was observed in MCF-7/cav-1 cells as compared with MCF-7 cells. Histological analysis of tumor sections demonstrated a marked decrease in the percentage of proliferating tumor cells (Ki-67 assay) along with an increase in apoptotic tumor cells (TUNEL assay) in MCF-7/cav-1-treated animals. Our current findings provide for the first time in vivo evidence that caveolin-1 can indeed function as a tumor suppressor in human breast adenocarcinoma derived from MCF-7 cells rather than as a tumor promoter.
Collapse
Affiliation(s)
- Ping Wu
- Center for Systems Biology, Institute of Biophysics, Chinese Academy of Sciences, Datun Road 15, Chaoyang District, Beijing 100101, China
| | | | | | | | | | | | | | | |
Collapse
|
45
|
Palozza P, Sestito R, Picci N, Lanza P, Monego G, Ranelletti FO. The sensitivity to beta-carotene growth-inhibitory and proapoptotic effects is regulated by caveolin-1 expression in human colon and prostate cancer cells. Carcinogenesis 2008; 29:2153-61. [PMID: 18635524 DOI: 10.1093/carcin/bgn018] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Although several mechanisms have been proposed to explain the putative role of beta-carotene in cancer, no studies have investigated a possible influence of beta-carotene on caveolin-1 (cav-1) pathway, an important intracellular signaling deregulated in cancer. Here, different human colon and prostate cancer cell lines, expressing (HCT-116, PC-3 cells) or not (Caco-2, LNCaP cells) cav-1, were treated with varying concentrations of beta-carotene (0.5-30 muM) for different periods of time (3-72 h) and the effects on cell growth were investigated. The results of this study show that (i) beta-carotene acted as a growth-inhibitory agent in cav-1-positive cells, but not in cav-1-negative cells; (ii) in cav-1-positive cells, the carotenoid downregulated in a dose- and time-dependent manner the expression of cav-1 protein and messenger RNA levels and inhibited AKT phosphorylation which, in turn, stimulated apoptosis by increasing the expression of beta-catenin and c-myc and the activity of caspases-3, -7, -8 and -9; when the carotenoid was removed from culture medium, a progressive increase in cell growth was observed with respect to beta-carotene-treated cells and (iii) the transfection of cav-1 in cav-1-negative cells increased cell sensitivity to beta-carotene by inducing apoptosis. This effect was accompanied by a reduction of both cav-1 and AKT phosphorylation and by an increase of c-myc and beta-catenin expression. Silencing of c-Myc attenuated beta-carotene-induced apoptosis and beta-catenin expression. All together, these data suggest that the modulation of cav-1 pathway by beta-carotene could be a novel mechanism by which the carotenoid acts as a potent growth-inhibitory agent in cancer cells.
Collapse
Affiliation(s)
- Paola Palozza
- Institute of General Pathology, Catholic University School of Medicine, Largo F. Vito 1, Rome 00168, Italy.
| | | | | | | | | | | |
Collapse
|
46
|
Quest AFG, Gutierrez-Pajares JL, Torres VA. Caveolin-1: an ambiguous partner in cell signalling and cancer. J Cell Mol Med 2008; 12:1130-50. [PMID: 18400052 PMCID: PMC3865655 DOI: 10.1111/j.1582-4934.2008.00331.x] [Citation(s) in RCA: 138] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Caveolae are small plasma membrane invaginations that have been implicated in a variety of functions including transcytosis, potocytosis and cholesterol transport and signal transduction. The major protein component of this compartment is a family of proteins called caveolins. Experimental data obtained in knockout mice have provided unequivocal evidence for a requirement of caveolins to generate morphologically detectable caveolae structures. However, expression of caveolins is not sufficient per seto assure the presence of these structures. With respect to other roles attributed to caveolins in the regulation of cellular function, insights are even less clear. Here we will consider, more specifically, the data concerning the ambiguous roles ascribed to caveolin-1 in signal transduction and cancer. In particular, evidence indicating that caveolin-1 function is cell context dependent will be discussed.
Collapse
Affiliation(s)
- Andrew F G Quest
- FONDAP Centre for Molecular Studies of the Cell, Facultad de Medicina, Universidad de Chile, Santiago, Chile.
| | | | | |
Collapse
|
47
|
Huang J, Kaminski PM, Edwards JG, Yeh A, Wolin MS, Frishman WH, Gewitz MH, Mathew R. Pyrrolidine dithiocarbamate restores endothelial cell membrane integrity and attenuates monocrotaline-induced pulmonary artery hypertension. Am J Physiol Lung Cell Mol Physiol 2008; 294:L1250-9. [PMID: 18390833 DOI: 10.1152/ajplung.00069.2007] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Monocrotaline (MCT)-induced pulmonary artery hypertension (PAH) in rats is preceded by an inflammatory response, progressive endothelial cell membrane disruption, reduction in the expression of caveolin-1, and reciprocal activation of STAT3 (PY-STAT3). Superoxide and NF-kappaB have been implicated in PAH. To evaluate the role of caveolin-1, PY-STAT3 activation, and superoxide in PAH, MCT-injected rats were treated daily with pyrrolidine dithiocarbamate (PDTC; starting on days 1, 3, and 14 x 2 wk), an inhibitor of inflammation and NF-kappaB activation. Hemodynamic data, the expression of inhibitory (I)-kappaBalpha, caveolin-1, and Tie2 (a membrane protein), activation of PY-STAT3 and NF-kappaB, and superoxide chemiluminescence were examined. Rats developed progressive PAH at 2 wk post-MCT. There was progressive reduction in the expression of caveolin-1, Tie2, and activation of PY-STAT3 in the lungs. Reduction in I-kappaBalpha expression was present at 2 and 4 wk post-MCT. Superoxide chemiluminescence and NF-kappaB activation were observed only at 2 wk post-MCT and both decreased by 4 wk post-MCT despite progressive PAH. PDTC (starting on days 1 and 3) rescued caveolin-1 and Tie2, reversed MCT-induced PY-STAT3 activation, and attenuated PAH. In addition, PDTC restored I-kappaBalpha expression and reduced superoxide chemiluminescence at 2 wk but did not inhibit NF-kappaB activation despite attenuation of PAH. PDTC had no effect on established PAH. Increased superoxide chemiluminescence and NF-kappaB activation appear to be a transient phenomenon in the MCT model. Thus the disruption of endothelial cell membrane integrity resulting in caveolin-1 loss and reciprocal activation of PY-STAT3 plays a key role in the MCT-induced PAH.
Collapse
Affiliation(s)
- Jing Huang
- Department of Pediatrics, New York Medical College, Valhalla, NY 10595, USA
| | | | | | | | | | | | | | | |
Collapse
|
48
|
Huang J, Kaminski PM, Edwards JG, Yeh A, Wolin MS, Frishman WH, Gewitz MH, Mathew R. Pyrrolidine dithiocarbamate restores endothelial cell membrane integrity and attenuates monocrotaline-induced pulmonary artery hypertension. Am J Physiol Lung Cell Mol Physiol 2008. [PMID: 18390833 DOI: 10.1152/ajplung] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Monocrotaline (MCT)-induced pulmonary artery hypertension (PAH) in rats is preceded by an inflammatory response, progressive endothelial cell membrane disruption, reduction in the expression of caveolin-1, and reciprocal activation of STAT3 (PY-STAT3). Superoxide and NF-kappaB have been implicated in PAH. To evaluate the role of caveolin-1, PY-STAT3 activation, and superoxide in PAH, MCT-injected rats were treated daily with pyrrolidine dithiocarbamate (PDTC; starting on days 1, 3, and 14 x 2 wk), an inhibitor of inflammation and NF-kappaB activation. Hemodynamic data, the expression of inhibitory (I)-kappaBalpha, caveolin-1, and Tie2 (a membrane protein), activation of PY-STAT3 and NF-kappaB, and superoxide chemiluminescence were examined. Rats developed progressive PAH at 2 wk post-MCT. There was progressive reduction in the expression of caveolin-1, Tie2, and activation of PY-STAT3 in the lungs. Reduction in I-kappaBalpha expression was present at 2 and 4 wk post-MCT. Superoxide chemiluminescence and NF-kappaB activation were observed only at 2 wk post-MCT and both decreased by 4 wk post-MCT despite progressive PAH. PDTC (starting on days 1 and 3) rescued caveolin-1 and Tie2, reversed MCT-induced PY-STAT3 activation, and attenuated PAH. In addition, PDTC restored I-kappaBalpha expression and reduced superoxide chemiluminescence at 2 wk but did not inhibit NF-kappaB activation despite attenuation of PAH. PDTC had no effect on established PAH. Increased superoxide chemiluminescence and NF-kappaB activation appear to be a transient phenomenon in the MCT model. Thus the disruption of endothelial cell membrane integrity resulting in caveolin-1 loss and reciprocal activation of PY-STAT3 plays a key role in the MCT-induced PAH.
Collapse
Affiliation(s)
- Jing Huang
- Department of Pediatrics, New York Medical College, Valhalla, NY 10595, USA
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Ingueneau C, Huynh-Do U, Thiers JC, Nègre-Salvayre A, Salvayre R, Vindis C. Caveolin-1 sensitizes vascular smooth muscle cells to mildly oxidized LDL-induced apoptosis. Biochem Biophys Res Commun 2008; 369:889-93. [PMID: 18328807 DOI: 10.1016/j.bbrc.2008.02.134] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2008] [Accepted: 02/23/2008] [Indexed: 12/01/2022]
Abstract
Oxidized low-density lipoprotein (oxLDL)-induced apoptosis of vascular cells may participate to plaque instability and rupture. Caveolin-1 has emerged as an important regulator of several signal transduction pathways and processes that play a role in atherosclerosis. In this study we examined the potential role of caveolin-1 in the regulation of oxLDL-induced Ca(2+) signaling and apoptosis in vascular smooth muscle cells (VSMC). Cells expressing caveolin-1 were more susceptible to oxLDL-induced apoptosis, and this was correlated with enhanced Ca(2+) entry and pro-apoptotic events. Moreover, caveolin-1 silencing by small interfering RNA decreased the level of apoptotic cells after oxLDL treatment. These findings provide new insights about the potential role of caveolin-1 in the regulation of oxLDL-induced apoptosis in vascular cells and its contribution to the instability of the plaque.
Collapse
Affiliation(s)
- Cécile Ingueneau
- INSERM U-858/I2MR, Department of Vascular Biology, IFR-31, CHU Rangueil, 1 Avenue Jean Poulhes, BP 84225, 31432 Toulouse Cedex 4, France
| | | | | | | | | | | |
Collapse
|
50
|
Hu G, Ye RD, Dinauer MC, Malik AB, Minshall RD. Neutrophil caveolin-1 expression contributes to mechanism of lung inflammation and injury. Am J Physiol Lung Cell Mol Physiol 2008; 294:L178-86. [PMID: 17993589 DOI: 10.1152/ajplung.00263.2007] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Caveolin-1 present in immune cells may be involved in regulation of the inflammatory response. Here, using caveolin-1-null (Cav-1(-/-)) mice, we addressed the role of caveolin-1 in polymorphonuclear neutrophils (PMNs) in regulating PMN activation-mediated lung injury. In lungs of wild-type (Cav-1(+/+)) mice perfused at constant flow with Krebs-Henseleit solution, addition of Cav-1(+/+) PMNs (4 x 10(6) cells) into the perfusate followed by their activation with formyl-Met-Leu-Phe (fMLP, 1.0 muM) plus platelet-activating factor (1.0 nM) increased pulmonary microvessel filtration coefficient by 150% and wet-to-dry lung weight ratio by 50% as well as PMN accumulation in lungs. These responses were markedly reduced in lungs perfused with Cav-1(-/-) PMNs followed by addition of the same activating agents. fMLP-stimulated adhesion of Cav-1(-/-) PMNs to pulmonary microvascular endothelial cells and migration of Cav-1(-/-) PMNs across endothelial monolayers were also impaired compared with Cav-1(+/+) PMNs. Cav-1(-/-) PMNs showed 50-80% reduction in PMA- or fMLP-stimulated superoxide production compared with Cav-1(+/+) PMNs. In addition, Cav-1(-/-) PMNs had decreased migratory activity (50%) and adhesion to fibrinogen (40%) in response to fMLP. Rac1 and Rac2 were activated in Cav-1(+/+) PMNs after stimulation of fMLP but not in Cav-1(-/-) PMNs. Exogenous expression of caveolin-1 in COS-phox cells augmented the fMLP-induced Rac1 activation and superoxide production, indicating a direct role of caveolin-1 in the mechanism of superoxide production. Thus caveolin-1 expression in PMNs plays a key role in mediating PMN activation, adhesion, and transendothelial migration and in PMN activation-induced lung inflammation and vascular injury.
Collapse
Affiliation(s)
- Guochang Hu
- Department of Pharmacology, University of Illinois College of Medicine, 835 South Wolcott Ave., Chicago, IL 60612, USA.
| | | | | | | | | |
Collapse
|