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Horibata Y, Sugimoto H. The ceramide transport protein CERT is involved in alkylacylglycerol transfer from the ER to the Golgi for the biosynthesis of ether phospholipid. Arch Biochem Biophys 2024; 752:109871. [PMID: 38110110 DOI: 10.1016/j.abb.2023.109871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/14/2023] [Accepted: 12/15/2023] [Indexed: 12/20/2023]
Abstract
Ether phospholipids are synthesized by a series of enzymes localized in peroxisomes, the endoplasmic reticulum (ER), and the Golgi apparatus. During this process, the lipid intermediate alkylacylglycerol (AAG) synthesized in the ER is transferred from the site of its synthesis to the Golgi apparatus. In this study, we determined whether ceramide transport protein (CERT) is a candidate for AAG transfer. A lipid transfer assay revealed that CERT can mediate AAG transfer between phospholipid liposomes. AAG transport activity was markedly inhibited by the CERT inhibitor HPA-12 and reduced when the lipid transport domain of CERT was deleted. Suppression of CERT in HEK293 cells resulted in increased levels of plasmanyl-PC, which is synthesized by the ER-residing choline/ethanolamine phosphotransferase 1 (CEPT1). The mRNA levels and enzymatic activity of plasmanyl-PC synthesizing enzymes were not increased in CERT-deficient cells, indicating that the increase in plasmanyl-PC results from AAG accumulation in the ER. Re-introduction of CERT into CERT-deficient cells caused a decrease in plasmanyl-PC. Taken together, our findings suggest for the first time that CERT is involved in the transfer of AAG from the ER to the Golgi apparatus and plays a role in the biosynthesis of ether phospholipids.
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Affiliation(s)
- Yasuhiro Horibata
- Department of Biochemistry, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Tochigi, 321-0293, Japan.
| | - Hiroyuki Sugimoto
- Department of Biochemistry, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Tochigi, 321-0293, Japan
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Hansford HJ, Cashin AG, Doyle J, Leake HB, McAuley JH, Jones MD. Barriers and Enablers to Using Intervention Reporting Guidelines in Sports and Exercise Medicine Trials: A Mixed-Methods Study. J Orthop Sports Phys Ther 2024; 54:1-11. [PMID: 37970804 DOI: 10.2519/jospt.2023.12110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
OBJECTIVE: To identify barriers and facilitators for using intervention reporting guidelines (CERT and TIDieR) from authors of randomized controlled trials in sports and exercise medicine journals. DESIGN: Mixed-methods cross-sectional online survey. METHODS: We recruited authors of randomized controlled trials published from June 2, 2018, to June 2, 2022, in the 10 leading sports and exercise medicine journals. We invited authors of eligible trials to complete an online survey that included multiple-choice and Likert-scale questions, as well as open-ended free-text questions on the barriers and facilitators to using intervention reporting guidelines. We used descriptive analysis to summarize the quantitative data and a hybrid deductive-inductive thematic analysis to identify barriers and facilitators from the qualitative data. We conducted a subgroup analysis to explore differences in barriers and facilitators between early-mid career researchers and senior researchers. RESULTS: Eighty-four participants from 21 countries completed the survey (44 early-mid-career researchers, 40 senior researchers). We identified 8 themes relating to using intervention reporting guidelines. Themes classified as barriers related to publication constraints (word count limits), low awareness of intervention reporting guidelines, unclear benefits of the guidelines, and the increased burden imposed upon the researcher. Themes classified as facilitators related to journal requirements for guidelines use, the desire to accurately describe interventions, recommendations from other researchers, and reporting guideline use indicating "quality" of work. CONCLUSION: Barriers to using intervention reporting guidelines are largely modifiable and could be addressed by journals mandating their use, and educational initiatives. J Orthop Sports Phys Ther 2024;54(2):1-11. Epub 16 November 2023. doi:10.2519/jospt.2023.12110.
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Leiherer A, Muendlein A, Saely CH, Laaksonen R, Fraunberger P, Drexel H. Ceramides improve cardiovascular risk prediction beyond low-density lipoprotein cholesterol. Eur Heart J Open 2024; 4:oeae001. [PMID: 38292914 PMCID: PMC10826640 DOI: 10.1093/ehjopen/oeae001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 12/12/2023] [Accepted: 12/27/2023] [Indexed: 02/01/2024]
Abstract
Aims Low-density lipoprotein cholesterol (LDL-C) is the best documented cardiovascular risk predictor and at the same time serves as a target for lipid-lowering therapy. However, the power of LDL-C to predict risk is biased by advanced age, comorbidities, and medical treatment, all known to impact cholesterol levels. Consequently, such biased patient cohorts often feature a U-shaped or inverse association between LDL-C and cardiovascular or overall mortality. It is not clear whether these constraints for risk prediction may likewise apply to other lipid risk markers in particular to ceramides and phosphatidylcholines. Methods and results In this observational cohort study, we recorded cardiovascular mortality in 1195 patients over a period of up to 16 years, comprising a total of 12 262 patient-years. The median age of patients at baseline was 67 years. All participants were either consecutively referred to elective coronary angiography or diagnosed with peripheral artery disease, indicating a high cardiovascular risk. At baseline, 51% of the patients were under statin therapy. We found a U-shaped association between LDL-C and cardiovascular mortality with a trough level of around 150 mg/dL of LDL-C. Cox regression analyses revealed that LDL-C and other cholesterol species failed to predict cardiovascular risk. In contrast, no U-shaped but linear association was found for ceramide- and phosphatidylcholine-containing markers and these markers were able to significantly predict the cardiovascular risk even after multivariate adjustment. Conclusion We thus suggest that ceramides- and phosphatidylcholine-based predictors rather than LDL-C may be used for a more accurate cardiovascular risk prediction in high-risk patients.
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Affiliation(s)
- Andreas Leiherer
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Carinagasse 47, A-6800 Feldkirch, Austria
- Private University of the Principality of Liechtenstein, Dorfstrasse 24, FL-9495 Triesen, Liechtenstein
- Medical Central Laboratories, Carinagasse 41, A-6800 Feldkirch, Austria
| | - Axel Muendlein
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Carinagasse 47, A-6800 Feldkirch, Austria
- Private University of the Principality of Liechtenstein, Dorfstrasse 24, FL-9495 Triesen, Liechtenstein
| | - Christoph H Saely
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Carinagasse 47, A-6800 Feldkirch, Austria
- Private University of the Principality of Liechtenstein, Dorfstrasse 24, FL-9495 Triesen, Liechtenstein
- Department of Internal Medicine III, Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria
| | - Reijo Laaksonen
- Finnish Cardiovascular Research Center, University of Tampere, FI-33014 Tampere, Finland
- Zora Biosciences, FI-02150 Espoo, Finland
| | - Peter Fraunberger
- Private University of the Principality of Liechtenstein, Dorfstrasse 24, FL-9495 Triesen, Liechtenstein
- Medical Central Laboratories, Carinagasse 41, A-6800 Feldkirch, Austria
| | - Heinz Drexel
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Carinagasse 47, A-6800 Feldkirch, Austria
- Private University of the Principality of Liechtenstein, Dorfstrasse 24, FL-9495 Triesen, Liechtenstein
- Vorarlberger Landeskrankenhausbetriebsgesellschaft, Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria
- Drexel University College of Medicine, Philadelphia, PA 19129, USA
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Mizuike A, Hanada K. DGARM/C10orf76/ARMH3 for Ceramide Transfer Zone at the Endoplasmic Reticulum-Distal Golgi Contacts. Contact (Thousand Oaks) 2024; 7:25152564241239443. [PMID: 38515862 PMCID: PMC10956147 DOI: 10.1177/25152564241239443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 02/26/2024] [Accepted: 02/28/2024] [Indexed: 03/23/2024]
Abstract
Phosphatidylinositol 4-monophosphate (PtdIns(4)P) is one of the key membrane components which mark the membrane contact sites. In the mammalian Golgi complex, PtdIns(4)P is produced at various subregions via specific mechanisms for each site. Particularly, PtdIns(4)P pools generated at the distal Golgi regions are pivotal for the determination of membrane contacts between the endoplasmic reticulum (ER) and Golgi, at which inter-organelle lipid transport takes place. In this short review, we will focus on C10orf76 (or ARMH3), which we propose to rename as DGARM after a distal Golgi armadillo repeat protein, for its function in generating a PtdIns(4)P pool crucial for ER-to-distal Golgi ceramide transport. We further discuss from the viewpoint of the evolutionary conservation of DGARM.
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Affiliation(s)
- Aya Mizuike
- Department of Quality Assurance, Radiation Safety and Information System, National Institute of Infectious Diseases, Tokyo, Japan
| | - Kentaro Hanada
- Department of Quality Assurance, Radiation Safety and Information System, National Institute of Infectious Diseases, Tokyo, Japan
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Jones P, Hataji O, Suzukamo Y, Crawford B, Sakai Y, Ishii T, Sato K, Sasaki E, Hashimoto K, Oga T. Development of a Communication Tool between Patients and Physicians for Recognizing COPD Exacerbations in Japan. COPD 2023; 20:216-223. [PMID: 37439578 DOI: 10.1080/15412555.2023.2219742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
In Japan, exacerbations are underreported compared with other countries, possibly due in part to a failure to recognize them. This study aimed to create a simple chronic obstructive pulmonary disease (COPD) Exacerbation Recognition Tool (CERT-J) specifically for Japanese patients. Patients ≥40 years with confirmed COPD or asthma-COPD overlap were included. Focus groups were held to identify words and phrases used by patients to describe symptoms associated with an exacerbation, resulting in candidate items being identified. Following cognitive debriefing, the items were refined based on item frequency, level of endorsement and effect of demographic factors. Exploratory factor analysis (EFA) was then performed to inform an expert panel's choice of items to form the new tool. A total of 41 patients were included in the focus groups and nine patients performed the cognitive debrief. Following this, the expert panel identified 26 items for testing in a further 100 patients (mean age 72 years, forced expiratory volume in 1 s 54.8% predicted and 1.8 exacerbations in the preceding 12 months). Eleven items were associated with breathlessness or activity limitation and seven of these were the most frequently endorsed. EFA identified four factors, with one (breathlessness) being dominant. The expert panel recommended that the CERT-J should include six items: breathlessness and activity limitation (3 items), cough (1 item) and phlegm (2 items). The final CERT-J should benefit patients with COPD by providing them with an increased understanding and recognition of exacerbations.Clinical Trial Registration: GSK K.K (jRCT1080224526).
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Affiliation(s)
| | - Osamu Hataji
- Respiratory Center, Matsusaka Municipal Hospital, Matsusaka, Mie, Japan
| | - Yoshimi Suzukamo
- Department of Physical Medicine and Rehabilitation, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | | | - Yoko Sakai
- Real World Evidence, Syneos Health, Tokyo, Japan
| | - Takeo Ishii
- Value Evidence Outcomes Respiratory Department, Japan Medical & Development, GSK K.K., Tokyo, Japan
| | - Keiko Sato
- Value Evidence Outcomes Respiratory Department, Japan Medical & Development, GSK K.K., Tokyo, Japan
- Information Technology Center, The University of Tokyo, Tokyo, Japan
| | - Eri Sasaki
- Value Evidence Outcomes Respiratory Department, Japan Medical & Development, GSK K.K., Tokyo, Japan
| | - Kenichi Hashimoto
- Value Evidence Outcomes Respiratory Department, Japan Medical & Development, GSK K.K., Tokyo, Japan
| | - Toru Oga
- Kawasaki Medical School, Kurashiki, Okayama, Japan
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Leiherer A, Muendlein A, Saely CH, Geiger K, Brandtner EM, Heinzle C, Gaenger S, Mink S, Laaksonen R, Fraunberger P, Drexel H. Coronary Event Risk Test ( CERT) as a Risk Predictor for the 10-Year Clinical Outcome of Patients with Peripheral Artery Disease. J Clin Med 2023; 12:6151. [PMID: 37834795 PMCID: PMC10573503 DOI: 10.3390/jcm12196151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/30/2023] [Accepted: 09/21/2023] [Indexed: 10/15/2023] Open
Abstract
(1) Background: Ceramides are a new kind of lipid biomarker and have already been demonstrated to be valuable risk predictors in coronary patients. Patients with peripheral artery disease (PAD) are a population with a worse prognosis and higher mortality risk compared to coronary artery disease (CAD) patients. However, the value of ceramides for risk prediction in PAD patients is still vague, as addressed in the present study. (2)Methods: This observational study included 379 PAD patients. The primary endpoint was all-cause mortality at 10 years of follow-up. A set of ceramides was measured by LC-MS/MS and combined according to the Coronary Event Risk Test (CERT) score, which categorizes patients into one of four risk groups (low risk, moderate risk, high risk, very high risk). (3) Results: Kaplan-Meier survival curves revealed that the overall survival of patients decreased with the increasing risk predicted by the four CERT categories, advancing from low risk to very high risk. Cox regression analysis demonstrated that each one-category increase resulted in a 35% rise in overall mortality risk (HR = 1.35 [1.16-1.58]). Multivariable adjustment, including, among others, age, LDL-cholesterol, type 2 diabetes, and statin treatment before the baseline, did not abrogate this significant association (HR = 1.22 [1.04-1.43]). Moreover, we found that the beneficial effect of statin treatment is significantly stronger in patients with a higher risk, according to CERT. (4) Conclusions: We conclude that the ceramide-based risk score CERT is a strong predictor of the 10-year mortality risk in patients with PAD.
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Affiliation(s)
- Andreas Leiherer
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria; (A.M.); (K.G.); (E.-M.B.); (S.G.); (H.D.)
- Private University of the Principality of Liechtenstein, FL-9495 Triesen, Liechtenstein; (S.M.); (P.F.)
- Medical Central Laboratories, A-6800 Feldkirch, Austria
| | - Axel Muendlein
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria; (A.M.); (K.G.); (E.-M.B.); (S.G.); (H.D.)
- Private University of the Principality of Liechtenstein, FL-9495 Triesen, Liechtenstein; (S.M.); (P.F.)
| | - Christoph H. Saely
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria; (A.M.); (K.G.); (E.-M.B.); (S.G.); (H.D.)
- Private University of the Principality of Liechtenstein, FL-9495 Triesen, Liechtenstein; (S.M.); (P.F.)
- Department of Internal Medicine III, Academic Teaching Hospital Feldkirch, A-6800 Feldkirch, Austria
| | - Kathrin Geiger
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria; (A.M.); (K.G.); (E.-M.B.); (S.G.); (H.D.)
- Medical Central Laboratories, A-6800 Feldkirch, Austria
| | - Eva-Maria Brandtner
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria; (A.M.); (K.G.); (E.-M.B.); (S.G.); (H.D.)
| | - Christine Heinzle
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria; (A.M.); (K.G.); (E.-M.B.); (S.G.); (H.D.)
- Medical Central Laboratories, A-6800 Feldkirch, Austria
| | - Stella Gaenger
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria; (A.M.); (K.G.); (E.-M.B.); (S.G.); (H.D.)
| | - Sylvia Mink
- Private University of the Principality of Liechtenstein, FL-9495 Triesen, Liechtenstein; (S.M.); (P.F.)
- Medical Central Laboratories, A-6800 Feldkirch, Austria
| | - Reijo Laaksonen
- Finnish Cardiovascular Research Center, University of Tampere, FI-33014 Tampere, Finland;
- Zora Biosciences, FI-02150 Espoo, Finland
| | - Peter Fraunberger
- Private University of the Principality of Liechtenstein, FL-9495 Triesen, Liechtenstein; (S.M.); (P.F.)
- Medical Central Laboratories, A-6800 Feldkirch, Austria
| | - Heinz Drexel
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Academic Teaching Hospital Feldkirch, Carinagasse 47, A-6800 Feldkirch, Austria; (A.M.); (K.G.); (E.-M.B.); (S.G.); (H.D.)
- Private University of the Principality of Liechtenstein, FL-9495 Triesen, Liechtenstein; (S.M.); (P.F.)
- Vorarlberger Landeskrankenhausbetriebsgesellschaft, Academic Teaching Hospital Feldkirch, A-6800 Feldkirch, Austria
- Drexel University College of Medicine, Philadelphia, PA 19129, USA
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Meyer P, Métille S. Computer security incident response teams: are they legally regulated? The Swiss example. Int Cybersecur Law Rev 2023; 4:39-60. [PMID: 36798529 PMCID: PMC9923885 DOI: 10.1365/s43439-022-00070-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 10/01/2022] [Indexed: 11/09/2022]
Abstract
Computer Security Incident Response Teams (CSIRTs) or Computer Emergency Response Teams (CERTs) are an integral part of incident handling capabilities and are increasingly demanded by organizations such as critical infrastructures. They can hold many different skills and are of great interest to organizations in terms of cyber security and, more concretely, cyber incident management. This contribution seeks to analyze the extent to which their activity is regulated under Swiss law, considering that private CSIRTs are not regulated in the same way as governmental and national CSIRTs such as the Computer Emergency Response Team of the Swiss government and official national CERT of Switzerland (GovCERT).
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Affiliation(s)
- Pauline Meyer
- grid.9851.50000 0001 2165 4204Faculty of law, criminal sciences and public administration, University of Lausanne, Lausanne, Switzerland
| | - Sylvain Métille
- grid.9851.50000 0001 2165 4204Faculty of law, criminal sciences and public administration, University of Lausanne, Lausanne, Switzerland ,UniDistance, Brig, Switzerland ,HDC, Lausanne, Switzerland
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Kumagai K, Sakai S, Ueno M, Kataoka M, Kobayashi S, Hanada K. Chlamydial Infection-Dependent Synthesis of Sphingomyelin as a Novel Anti-Chlamydial Target of Ceramide Mimetic Compounds. Int J Mol Sci 2022; 23:ijms232314697. [PMID: 36499025 PMCID: PMC9735676 DOI: 10.3390/ijms232314697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/09/2022] [Accepted: 11/17/2022] [Indexed: 11/27/2022] Open
Abstract
The obligate intracellular bacterium Chlamydia trachomatis is the major causative agent of bacterial sexually transmitted diseases worldwide. In infected cells, the ceramide transport protein (CERT) is recruited to inclusions, where C. trachomatis replicates using host-synthesized ceramide. The ceramide is converted to sphingomyelin (SM) by a chlamydial infection-dependent SM synthesis (cidSM-synthesis) pathway, which occurs even in the absence of the SM synthases (SMS)-1 and -2 of host cells. The ceramide mimetic compound (1R,3S)-HPA-12 and the nonmimetic compound E16A, both of which are potent inhibitors of CERT, repressed the proliferation of C. trachomatis in HeLa cells. Unexpectedly, (1R,3R)-HPA-12, a ceramide mimetic compound that lacks CERT inhibitory activity, also exhibited potent anti-chlamydial activity. Using endogenous SMS-knockout mutant HeLa cells, we revealed that (1R,3R)-HPA-12 mildly inhibited cidSM-synthesis. In addition, LC-MS analysis revealed that (1R,3R)-HPA-12 is converted to a phosphocholine-conjugated metabolite in an infection-dependent manner. Imaging analysis with a fluorescent analog of ceramide suggested that cidSM-synthesis occurs in the bacterial bodies and/or inclusions. Collectively, these results suggested that (1R,3R)-HPA-12 exerts its anti-chlamydia activity not only as an inhibitor of cidSM-synthesis, but also via putative toxic effects of its phosphocholine adduct, which is most likely produced by the cidSM-synthesis route.
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Affiliation(s)
- Keigo Kumagai
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
- Correspondence: (K.K.); (K.H.)
| | - Shota Sakai
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Masaharu Ueno
- Department of Natural Science, Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minami-jousanjima, Tokushima 770-8506, Japan
| | - Michiyo Kataoka
- Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Shu Kobayashi
- Department of Chemistry, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 110-0033, Japan
| | - Kentaro Hanada
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
- Correspondence: (K.K.); (K.H.)
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Crivelli SM, Giovagnoni C, Zhu Z, Tripathi P, Elsherbini A, Quadri Z, Pu J, Zhang L, Ferko B, Berkes D, Spassieva SD, Martinez‐Martinez P, Bieberich E. Function of ceramide transfer protein for biogenesis and sphingolipid composition of extracellular vesicles. J Extracell Vesicles 2022; 11:e12233. [PMID: 35642450 PMCID: PMC9156972 DOI: 10.1002/jev2.12233] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 05/10/2022] [Accepted: 05/11/2022] [Indexed: 12/16/2022] Open
Abstract
The formation of extracellular vesicles (EVs) is induced by the sphingolipid ceramide. How this pathway is regulated is not entirely understood. Here, we report that the ceramide transport protein (CERT) mediates a non-vesicular transport of ceramide between the endoplasmic reticulum (ER) and the multivesicular endosome at contact sites. The process depends on the interaction of CERT's PH domain with PI4P generated by PI4KIIα at endosomes. Furthermore, a complex is formed between the START domain of CERT, which carries ceramide, and the Tsg101 protein, which is part of the endosomal sorting complex required for transport (ESCRT-I). Inhibition of ceramide biosynthesis reduces CERT-Tsg101 complex formation. Overexpression of CERT increases EV secretion while its inhibition reduces EV formation and the concentration of ceramides and sphingomyelins in EVs. In conclusion, we discovered a function of CERT in regulating the sphingolipid composition and biogenesis of EVs, which links ceramide to the ESCRT-dependent pathway.
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Affiliation(s)
- Simone M. Crivelli
- Department of PhysiologyUniversity of KentuckyLexingtonKentuckyUSA
- Veterans Affairs Medical CenterLexingtonKentuckyUSA
| | - Caterina Giovagnoni
- Department of Psychiatry and NeuropsychologySchool for Mental Health and NeuroscienceMaastricht UniversityMaastrichtThe Netherlands
| | - Zhihui Zhu
- Department of PhysiologyUniversity of KentuckyLexingtonKentuckyUSA
| | - Priyanka Tripathi
- Department of PhysiologyUniversity of KentuckyLexingtonKentuckyUSA
- Veterans Affairs Medical CenterLexingtonKentuckyUSA
| | - Ahmed Elsherbini
- Department of PhysiologyUniversity of KentuckyLexingtonKentuckyUSA
| | - Zainuddin Quadri
- Department of PhysiologyUniversity of KentuckyLexingtonKentuckyUSA
- Veterans Affairs Medical CenterLexingtonKentuckyUSA
| | - Jian Pu
- Department of SurgeryUniversity of KentuckyLexingtonKentuckyUSA
| | - Liping Zhang
- Department of PhysiologyUniversity of KentuckyLexingtonKentuckyUSA
- Veterans Affairs Medical CenterLexingtonKentuckyUSA
| | - Branislav Ferko
- Department of Organic ChemistrySlovak University of TechnologyBratislavaSlovak Republic
| | - Dusan Berkes
- Department of Organic ChemistrySlovak University of TechnologyBratislavaSlovak Republic
| | | | - Pilar Martinez‐Martinez
- Department of Psychiatry and NeuropsychologySchool for Mental Health and NeuroscienceMaastricht UniversityMaastrichtThe Netherlands
| | - Erhard Bieberich
- Department of PhysiologyUniversity of KentuckyLexingtonKentuckyUSA
- Veterans Affairs Medical CenterLexingtonKentuckyUSA
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Breed R, Opar D, Timmins R, Maniar N, Banyard H, Hickey J. Poor Reporting of Exercise Interventions for Hamstring Strain Injury Rehabilitation: A Scoping Review of Reporting Quality and Content in Contemporary Applied Research. J Orthop Sports Phys Ther 2022; 52:130-41. [PMID: 34546816 DOI: 10.2519/jospt.2022.10641] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To review the quality of reporting and identify the content of exercise interventions prescribed for hamstring strain injury (HSI) rehabilitation in the scientific literature from 2010 to 2020. DESIGN Scoping review. LITERATURE SEARCH We searched the bibliometric databases Web of Science, CINAHL, SPORTDiscus, Scopus, Cochrane Library, MEDLINE, and Embase. STUDY SELECTION CRITERIA Original research articles (randomized controlled trials and cohort studies) published from 2010 to 2020 that described an exercise rehabilitation intervention for participants with acute HSIs were included. Injuries must have been confirmed within 7 days of occurrence via clinical assessment and/or diagnostic imaging. DATA SYNTHESIS The quality of reporting, in terms of completeness of exercise intervention description, was evaluated using the Consensus on Exercise Reporting Template (CERT), and the content of interventions was categorized into exercise types. RESULTS Fourteen studies were included; exercise intervention quality of reporting was moderate in 3 studies and low in 11 studies. Using the 19-item CERT, an average of 8.8 items (range, 4-14) were reported across all studies. Two studies reported sufficient exercise content and progression information to allow replication. Exercises categorized as hamstring flexibility, hamstring strength, running related, and non-hamstring specific were prescribed in 13, 11, 10, and 10 studies, respectively. Half of the included studies incorporated all 4 exercise types in their exercise interventions. CONCLUSION There is a wide variety of exercise interventions applied in published research that has addressed HSI rehabilitation. Researchers must improve reporting quality to support other professionals in replicating exercise interventions and help practitioners to effectively implement research in practice. J Orthop Sports Phys Ther 2022;52(3):130-141. Epub 21 Sep 2021. doi:10.2519/jospt.2022.10641.
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Vlok A, van Dyk N, Coetzee D, Grindem H. Exercise Descriptors That Determine Muscle Strength Gains Are Missing From Reported Anterior Cruciate Ligament Reconstruction Rehabilitation Programs: A Scoping Review of 117 Exercises in 41 Studies. J Orthop Sports Phys Ther 2022; 52:100-12. [PMID: 34784243 DOI: 10.2519/jospt.2022.10651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To (1) describe which strength training exercise descriptors are reported in anterior cruciate ligament reconstruction (ACLR) rehabilitation research, and (2) compare the current standards of reporting ACLR strength training exercise descriptors to international best-practice strength training guidelines. DESIGN Scoping review. LITERATURE SEARCH We searched the MEDLINE, PsycINFO, CINAHL, SPORTDiscus, Academic Search, ERIC, Health Source: Nursing, Health Source: Consumer, MasterFILE, and Africa-Wide Information databases. STUDY SELECTION CRITERIA We included level I to IV studies of ACLR rehabilitation programs with 1 or more reported strength training exercise descriptors. We used a predefined list of 19 exercise descriptors, based on the American College of Sports Medicine (ACSM) exercise recommendations, the Consensus on Exercise Reporting Template (CERT), and the Toigo and Boutellier exercise descriptor framework. DATA SYNTHESIS Completeness and the standard of reporting exercise descriptors in ACLR rehabilitation programs were assessed by means of international best-practice strength training standards. RESULTS We extracted data on 117 exercises from 41 studies. A median of 7 of the 19 possible exercise descriptors were reported (range, 3-16). Reporting of specific exercise descriptors varied across studies, from 95% (name of the strength training exercise) to 5% (exercise aim, exercise order). On average, 46%, 35%, and 43% of the exercise descriptors included in the ACSM, CERT, and Toigo and Boutellier guidelines were reported, respectively. CONCLUSION Key exercise descriptors for muscle strength gains are not reported in studies on ACLR rehabilitation. Only the exercise name, number of exercises, frequency, and experimental period were reported in most of the studies. J Orthop Sports Phys Ther 2022;52(2):100-112. Epub 16 Nov 2021. doi:10.2519/jospt.2022.10651.
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12
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Lankford CL, Louie EA, Zu Z, Does MD, Gochberg DF. A hybrid numeric-analytic solution for pulsed CEST. NMR Biomed 2022; 35:e4610. [PMID: 34636458 PMCID: PMC9045009 DOI: 10.1002/nbm.4610] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 07/23/2021] [Accepted: 08/12/2021] [Indexed: 05/08/2023]
Abstract
Chemical exchange saturation transfer (CEST) methods measure the effect of magnetization exchange between solutes and water. While CEST methods are often implemented using a train of off-resonant shaped RF pulses, they are typically analyzed as if the irradiation were continuous. This approximation does not account for exchange of rotated magnetization, unique to pulsed irradiation and exploited by chemical exchange rotation transfer methods. In this work, we derive and test an analytic solution for the steady-state water signal under pulsed irradiation by extending a previous work to include the effects of pulse shape. The solution is largely accurate at all offsets, but this accuracy diminishes at higher exchange rates and when applying pulse shapes with large root-mean-squared to mean ratios (such as multi-lobe sinc pulses).
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Affiliation(s)
- Christopher L. Lankford
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
| | - Elizabeth A. Louie
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
| | - Zhongliang Zu
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA
| | - Mark D. Does
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
- Department of Electrical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Daniel F. Gochberg
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA
- Corresponding author. Vanderbilt University Institute of Imaging Science, 1161 21 Ave. S, MCN AAA–3112, Nashville, TN 37232–2310, USA.
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13
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Hacke C, Schreiber J, Weisser B. Application of the Templates TIDieR and CERT Reveal Incomplete Reporting and Poor Replicability of Exercise Interventions for Type 2 Diabetes Mellitus. Curr Diabetes Rev 2022; 18:e250821195838. [PMID: 34433402 DOI: 10.2174/1871525719666210825150957] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 06/16/2021] [Accepted: 07/16/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Exercise is strongly recommended for the management of type 2 diabetes mellitus (T2DM). However, incomplete intervention reporting in clinical trials limits the replication of exercise protocols. As previously demonstrated by us for exercise and hypertension, the reporting quality might also be insufficient in studies with respect to T2DM and exercise. OBJECTIVE The aim of the study was to assess the completeness of exercise intervention reporting in randomized controlled trials (RCTs) for T2DM. METHODS Two independent reviewers applied the Consensus on Exercise Reporting Template (CERT) and the template for intervention description and replication (TIDieR) to 23 exercise trials obtained from the most recent and frequently cited meta-analysis in current guidelines. The completeness of reporting was evaluated, focusing on the F.I.T.T. components (frequency, intensity, time, type). Interrater agreement and associations with publication year and journal impact factor were examined. RESULTS Mean CERT score was 11/19 (range 5-17), and 8/12 (range 4-12) for TIDieR. F.I.T.T. components were almost completely described, whereas overall completeness of exercise reporting was 60% and 68% (CERT and TIDieR). Replication of each exercise of the respective program was not possible in 52% of interventions. The majority of items had shown excellent agreement. No associations with publication year or impact factor were found. CONCLUSION Exercise interventions were not found to be sufficiently reported in RCTs that currently guide clinical practice in T2DM. Replication in further studies or clinical practice is limited due to poor exercise description. We suggest the use of more specific CERT for reporting results of exercise interventions. Further refinement for internal diseases is needed to better describe exercise interventions.
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Affiliation(s)
- Claudia Hacke
- Department of Sports Medicine, Institute of Sports Science, Christian-Albrechts-University Kiel, Kiel, Germany
| | - Janika Schreiber
- Department of Sports Medicine, Institute of Sports Science, Christian-Albrechts-University Kiel, Kiel, Germany
| | - Burkhard Weisser
- Department of Sports Medicine, Institute of Sports Science, Christian-Albrechts-University Kiel, Kiel, Germany
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14
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Barman B, Renee Dawson T, Weaver AM. ER membrane contact sites: key platforms for biogenesis of RNA-containing extracellular vesicles. Contact (Thousand Oaks) 2022; 5:25152564221121444. [PMID: 37008559 PMCID: PMC10065479 DOI: 10.1177/25152564221121444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The mechanisms by which cytoplasmic cargoes such as RNAs are incorporated into extracellular vesicles (EVs) are poorly understood. In a recent article published in Developmental Cell, we describe a novel function of endoplasmic reticulum membrane contact sites (ER MCS) in regulating biogenesis of RNA-containing EVs (Barman et al., 2022). We identified the ER MCS tether protein VAP-A and the ceramide transporter CERT as key drivers of this process. VAP-A depletion and overexpression produced corresponding changes in the overall number and RNA content of secreted EVs. Further sub-fractionation of small EVs from VAP-A depleted cells revealed a distinct loss in a specific subset of dense, RNA-loaded small EVs that are critical for the transfer of miR-100 to recipient cells. Cell imaging data confirmed the loss of RNA and RNA binding proteins (RBPs) in VAP-A-knockdown multivesicular bodies. Lipid analysis of VAP-A-knockdown EVs revealed decreases in ceramides, which are known to affect EV biogenesis. Depletion of the ceramide transfer protein CERT, which interacts with its binding partner VAP-A at ER MCS, leads to similar defects in EV number and RNA content as VAP-A-knockdown. These data suggest a model for ER MCS as platforms for biogenesis of a key EV population via ceramide transfer and RNA loading.
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Affiliation(s)
- Bahnisikha Barman
- Department of Cell and Developmental Biology, Vanderbilt University School of
Medicine, Nashville, TN, USA
| | - T. Renee Dawson
- Department of Cell and Developmental Biology, Vanderbilt University School of
Medicine, Nashville, TN, USA
| | - Alissa M. Weaver
- Department of Cell and Developmental Biology, Vanderbilt University School of
Medicine, Nashville, TN, USA
- Department of Pathology, Microbiology and
Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
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15
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Chung LH, Liu D, Liu XT, Qi Y. Ceramide Transfer Protein ( CERT): An Overlooked Molecular Player in Cancer. Int J Mol Sci 2021; 22:13184. [PMID: 34947980 PMCID: PMC8705978 DOI: 10.3390/ijms222413184] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 12/02/2021] [Accepted: 12/05/2021] [Indexed: 12/26/2022] Open
Abstract
Sphingolipids are a class of essential lipids implicated in constructing cellular membranes and regulating nearly all cellular functions. Sphingolipid metabolic network is centered with the ceramide-sphingomyelin axis. Ceramide is well-recognized as a pro-apoptotic signal; while sphingomyelin, as the most abundant type of sphingolipids, is required for cell growth. Therefore, the balance between these two sphingolipids can be critical for cancer cell survival and functioning. Ceramide transfer protein (CERT) dictates the ratio of ceramide to sphingomyelin within the cell. It is the only lipid transfer protein that specifically delivers ceramide from the endoplasmic reticulum to the Golgi apparatus, where ceramide serves as the substrate for sphingomyelin synthesis. In the past two decades, an increasing body of evidence has suggested a critical role of CERT in cancer, but much more intensive efforts are required to draw a definite conclusion. Herein, we review all research findings of CERT, focusing on its molecular structure, cellular functions and implications in cancer. This comprehensive review of CERT will help to better understand the molecular mechanism of cancer and inspire to identify novel druggable targets.
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Affiliation(s)
- Long Hoa Chung
- Centenary Institute of Cancer Medicine and Cell Biology, University of Sydney, Camperdown, NSW 2050, Australia; (D.L.); (X.T.L.)
| | | | | | - Yanfei Qi
- Centenary Institute of Cancer Medicine and Cell Biology, University of Sydney, Camperdown, NSW 2050, Australia; (D.L.); (X.T.L.)
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16
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Leiherer A, Mündlein A, Laaksonen R, Lääperi M, Jylhä A, Fraunberger P, Drexel H. Comparison of recent ceramide-based coronary risk prediction scores in cardiovascular disease patients. Eur J Prev Cardiol 2021; 29:947-956. [PMID: 34417607 DOI: 10.1093/eurjpc/zwab112] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 05/27/2021] [Accepted: 06/10/2021] [Indexed: 12/27/2022]
Abstract
AIM Cholesterol-based risk prediction is often insufficient in cardiovascular disease (CVD) patients. Ceramides are a new kind of biomarkers for CVD. The Coronary Event Risk Test (CERT) is a validated cardiovascular risk predictor that uses only circulating ceramide levels, determined by coupled liquid chromatography-mass spectrometry, to allocate patients into one of four risk categories. This test has recently been modified (CERT2) by additionally including phosphatidylcholine levels. METHODS AND RESULTS In this observational cohort study, we have recruited 999 Austrian patients with CVD and followed them for up to 13 years. We found that CERT and CERT2 both predicted cardiovascular events, cardiovascular mortality, and overall mortality. CERT2 had the higher performance compared to CERT and also to the recent cardiovascular risk score of the ESC/EAS guidelines (Systematic COronary Risk Evaluation (SCORE)) for low-risk European countries. Combining CERT2 with the ESC/EAS-SCORE, predictive capacity was further increased leading to a hazard ratio of 3.58 (2.02-6.36; P < 0.001) for cardiovascular events, 11.60 (2.72-49.56; P = 0.001) for cardiovascular mortality, and 9.86 (4.23-22.99; P < 0.001) for overall mortality when patients with very high risk (category 4) were compared to those with low risk (category 1). The use of the combined score instead of the ESC/EAS-SCORE significantly improved the predictive power according to the integrated discrimination improvement index (P = 0.004). CONCLUSION We conclude that CERT and CERT2 are powerful predictors of cardiovascular events, cardiovascular mortality, and overall mortality in CVD patients. Including phosphatidylcholine to a ceramide-based score increases the predictive performance and is best in combination with classical risk factors as used in the ESC/EAS-SCORE.
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Affiliation(s)
- Andreas Leiherer
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Carinagasse 47, A-6800 Feldkirch, Austria.,Medical Central Laboratories, Carinagasse 41, A-6807, Feldkirch, Austria.,Private University of the Principality of Liechtenstein, Dorfstrasse 24 FL-9495 Triesen, Liechtenstein
| | - Axel Mündlein
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Carinagasse 47, A-6800 Feldkirch, Austria.,Private University of the Principality of Liechtenstein, Dorfstrasse 24 FL-9495 Triesen, Liechtenstein
| | - Reijo Laaksonen
- Finnish Cardiovascular Research Center, University of Tampere, Arvo Ylpön katu 34, 33520 Tampere, Finland.,Zora Biosciences Oy, Tietotie 2C, 02150 Espoo, Finland
| | - Mitja Lääperi
- Zora Biosciences Oy, Tietotie 2C, 02150 Espoo, Finland
| | - Antti Jylhä
- Zora Biosciences Oy, Tietotie 2C, 02150 Espoo, Finland
| | - Peter Fraunberger
- Medical Central Laboratories, Carinagasse 41, A-6807, Feldkirch, Austria.,Private University of the Principality of Liechtenstein, Dorfstrasse 24 FL-9495 Triesen, Liechtenstein
| | - Heinz Drexel
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Carinagasse 47, A-6800 Feldkirch, Austria.,Private University of the Principality of Liechtenstein, Dorfstrasse 24 FL-9495 Triesen, Liechtenstein.,Department of Internal Medicine, Academic Teaching Hospital Bregenz, Carl-Pedenz-Str. 2, A-6900 Bregenz, Austria.,Drexel University College of Medicine, 2900 W Qeen Ln, PA 19129 Philadelphia, PA, USA
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17
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Bakaa N, Chen LH, Carlesso L, Richardson J, Macedo L. Reporting of post-operative rehabilitation interventions for Total knee arthroplasty: a scoping review. BMC Musculoskelet Disord 2021; 22:602. [PMID: 34193139 PMCID: PMC8247251 DOI: 10.1186/s12891-021-04460-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 06/08/2021] [Indexed: 12/17/2022] Open
Abstract
Objective The aim of this study was to evaluate the completeness of reporting of exercise adherence and exercise interventions delivered as part of clinical trials of post-operative total knee replacement (TKA) rehabilitation. Design: Scoping review Literature search A literature search was conducted in PubMed, EMBASE, AMED, CINAHL, SPORTDiscus and Cochrane Library. Study selection criteria All randomized controlled trials (RCT) that examined post-operative exercise-based interventions for total knee arthroplasty were eligible for inclusion. Studies that were multifactorial or contained exercise interventions for both hip and knee arthroplasty were also included. Data synthesis The definition, type of measurement used and outcome for exercise adherence were collected and analyzed descreptively. Quality of reporting of exercise interventions were assessed using the Consensus for Exercise Reporting Tool (CERT) and the Cochrane Risk of Bias Tool. Results There were a total of 112 RCTs included in this review. The majority of RCTs (63%, n = 71) did not report exercise adherence. Only 23% (n = 15) of studies provided a definition of adherence. RCTs were of poor quality, with 85% (n = 95) of studies having high or unclear risk of bias. Reporting of exercise interventions was poor, with only 4 items (of 19) (21%) of the CERT adequately reported (88–99%), with other items not fulfilled on at least 60% of the RCTs. There were no RCTs that had fulfilled all the criteria for the CERT. Conclusion The RCTs included in this study poorly reported exercise adherence, as well as description of the post-operative TKA rehabilitation intervention. Future RCTs should use valid and reliable measures of adherence and a proper tool for reporting of exercise interventions (e.g., CERT, TiDER). Pre-registration OSF:https://osf.io/9ku8a/ Supplementary Information The online version contains supplementary material available at 10.1186/s12891-021-04460-w.
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Affiliation(s)
- Nora Bakaa
- School of Rehabilitation Sciences, Faculty of Health Sciences, McMaster University, Institute of Applied Health Sciences, Room 403, 1400 Main St. W., Hamilton, ON, L8S 1C7, Canada.
| | - Lu Hsi Chen
- School of Rehabilitation Sciences, Faculty of Health Sciences, McMaster University, Institute of Applied Health Sciences, Room 403, 1400 Main St. W., Hamilton, ON, L8S 1C7, Canada
| | - Lisa Carlesso
- School of Rehabilitation Sciences, Faculty of Health Sciences, McMaster University, Institute of Applied Health Sciences, Room 403, 1400 Main St. W., Hamilton, ON, L8S 1C7, Canada
| | - Julie Richardson
- School of Rehabilitation Sciences, Faculty of Health Sciences, McMaster University, Institute of Applied Health Sciences, Room 403, 1400 Main St. W., Hamilton, ON, L8S 1C7, Canada
| | - Luciana Macedo
- School of Rehabilitation Sciences, Faculty of Health Sciences, McMaster University, Institute of Applied Health Sciences, Room 403, 1400 Main St. W., Hamilton, ON, L8S 1C7, Canada
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18
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Abstract
Viruses are obligate parasites that depend on the host cell machinery for their replication and dissemination. Cellular lipids play a central role in multiple stages of the viral life cycle such as entry, replication, morphogenesis, and egress. Most viruses reorganize the host cell membranes for the establishment of viral replication complex. These specialized structures allow the segregation of replicating viral RNA from ribosomes and protect it from host nucleases. They also facilitate localized enrichment of cellular components required for viral replication and assembly. The specific composition of the lipid membrane governs its ability to form negative or positive curvature and possess a rigid or flexible form, which is crucial for membrane rearrangement and establishment of viral replication complexes. In this review, we highlight how different viruses manipulate host lipid transfer proteins and harness their functions to enrich different membrane compartments with specific lipids in order to facilitate multiple aspects of the viral life cycle.
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Affiliation(s)
- Kiran Avula
- Virus-Host Interaction Lab, Institute of Life Sciences, Bhubaneshwar, India.,Regional Centre for Biotechnology, Faridabad, India
| | - Bharati Singh
- Virus-Host Interaction Lab, Institute of Life Sciences, Bhubaneshwar, India.,School of Biotechnology, Kalinga Institute of Industrial Technology, Bhubaneshwar, India
| | - Preethy V Kumar
- Virus-Host Interaction Lab, Institute of Life Sciences, Bhubaneshwar, India.,School of Biotechnology, Kalinga Institute of Industrial Technology, Bhubaneshwar, India
| | - Gulam H Syed
- Virus-Host Interaction Lab, Institute of Life Sciences, Bhubaneshwar, India
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19
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Davidson SRE, Kamper SJ, Haskins R, Robson E, Gleadhill C, da Silva PV, Williams A, Yu Z, Williams CM. Exercise interventions for low back pain are poorly reported: a systematic review. J Clin Epidemiol 2021; 139:279-286. [PMID: 34091020 DOI: 10.1016/j.jclinepi.2021.05.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 05/17/2021] [Accepted: 05/26/2021] [Indexed: 01/22/2023]
Abstract
OBJECTIVE To assess the reporting quality of exercise interventions from clinical trials of low back pain (LBP). STUDY DESIGN AND SETTING We conducted a systematic review to assess the reporting quality of randomised controlled trials (RCTs) that investigated the effectiveness of exercise interventions for patients with LBP. Five online databases and Clinical Trial Registries were searched (October 2018). We included RCTs that reported interventions for LBP, containing at least 50% exercise. The Template for Intervention Description and Replication (TIDieR) and the Consensus on Exercise Reporting Template (CERT) reporting checklists were then used to assess quality of reporting. RESULTS 582 trials were eligible for inclusion. Due to the large number of eligible studies, 100 studies were randomly selected for data extraction and coding with the TIDieR and CERT checklists. The random sample was representative of the 582 eligible trials. The overall completeness of reporting (median (IQR)) of TIDieR items was 59.2% (45.5%-72.7%) and CERT was 33.3% (22.2%-52.6%). CONCLUSIONS We found poor overall reporting with both checklists, which has not improved over time or since the introduction of the checklists. More dedicated work is required to address poor reporting of exercise interventions in clinical trials.
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Affiliation(s)
- Simon R E Davidson
- School of Medicine and Public Health, University of Newcastle, University Drive, Callaghan NSW, 2308, Australia; Hunter New England Population Health, Hunter New England Local Health District, Locked Bag 10, Wallsend NSW, 2287, Australia.
| | - Steven J Kamper
- School of Health Sciences, University of Sydney, PO Box M179, Missenden Rd, Camperdown NSW, 2050, Australia; Nepean Blue Mountains Local Health District, Penrith NSW, 2750, Australia
| | - Robin Haskins
- John Hunter Hospital Outpatient Services, Lookout Road, New Lambton Heights NSW, 2305, Australia
| | - Emma Robson
- School of Medicine and Public Health, University of Newcastle, University Drive, Callaghan NSW, 2308, Australia; Hunter New England Population Health, Hunter New England Local Health District, Locked Bag 10, Wallsend NSW, 2287, Australia
| | - Connor Gleadhill
- School of Medicine and Public Health, University of Newcastle, University Drive, Callaghan NSW, 2308, Australia; Hunter New England Population Health, Hunter New England Local Health District, Locked Bag 10, Wallsend NSW, 2287, Australia
| | - Priscilla Viana da Silva
- School of Medicine and Public Health, University of Newcastle, University Drive, Callaghan NSW, 2308, Australia; Hunter New England Population Health, Hunter New England Local Health District, Locked Bag 10, Wallsend NSW, 2287, Australia
| | - Amanda Williams
- School of Medicine and Public Health, University of Newcastle, University Drive, Callaghan NSW, 2308, Australia
| | - Zhongming Yu
- Community Therapy, 71 Ronald Avenue, Shoal Bay NSW, 2315, Australia
| | - Christopher M Williams
- School of Medicine and Public Health, University of Newcastle, University Drive, Callaghan NSW, 2308, Australia; Hunter New England Population Health, Hunter New England Local Health District, Locked Bag 10, Wallsend NSW, 2287, Australia
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20
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Zu Z, Lin EC, Louie EA, Jiang X, Lankford CL, Damon B, Does MD, Gore JC, Gochberg DF. Chemical exchange rotation transfer imaging of phosphocreatine in muscle. NMR Biomed 2021; 34:e4437. [PMID: 33283945 PMCID: PMC7902410 DOI: 10.1002/nbm.4437] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 10/09/2020] [Accepted: 10/12/2020] [Indexed: 05/22/2023]
Abstract
In chemical exchange saturation transfer (CEST) imaging, the signal at 2.6 ppm from the water resonance in muscle has been assigned to phosphocreatine (PCr). However, this signal has limited specificity for PCr since the signal is also sensitive to exchange with protein and macromolecular protons when using some conventional quantification methods, and will vary with changes in the water longitudinal relaxation rate. Correcting for these effects while maintaining reasonable acquisition times is challenging. As an alternative approach to overcome these problems, here we evaluate chemical exchange rotation transfer (CERT) imaging of PCr in muscle at 9.4 T. Specifically, the CERT metric, AREXdouble,cpw at 2.6 ppm, was measured in solutions containing the main muscle metabolites, in tissue homogenates with controlled PCr content, and in vivo in rat leg muscles. PCr dominates CERT metrics around 2.6 ppm (although with nontrivial confounding baseline contributions), indicating that CERT is well-suited to PCr specific imaging, and has the added benefit of requiring a relatively small number of acquisitions.
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Affiliation(s)
- Zhongliang Zu
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Eugene C. Lin
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Elizabeth A. Louie
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Xiaoyu Jiang
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Christopher L. Lankford
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Bruce Damon
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Mark D. Does
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN
| | - John C. Gore
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
- Deparment of Physics and Astronomy, Vanderbilt University, Nashville, TN
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Daniel F. Gochberg
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
- Deparment of Physics and Astronomy, Vanderbilt University, Nashville, TN
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21
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Christensen M, Zellers JA, Kjær IL, Silbernagel KG, Rathleff MS. Resistance Exercises in Early Functional Rehabilitation for Achilles Tendon Ruptures Are Poorly Described: A Scoping Review. J Orthop Sports Phys Ther 2020; 50:681-90. [PMID: 33094667 DOI: 10.2519/jospt.2020.9463] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVES To (1) describe which resistance exercises are used in the first 8 weeks of treatment for acute Achilles tendon rupture and (2) assess the completeness of reporting of the exercise descriptions. DESIGN Scoping review. LITERATURE SEARCH We searched the MEDLINE, Embase, CINAHL, Cochrane Library, and Physiotherapy Evidence Database (PEDro) databases. STUDY SELECTION CRITERIA Randomized controlled trials, cohort studies, and case series (10 or more participants) that reported using resistance exercise in the immobilization period in the first 8 weeks of treatment for acute Achilles tendon rupture were included. DATA SYNTHESIS Completeness of exercise description was assessed with the Consensus on Exercise Reporting Template (CERT) and the Toigo and Boutellier exercise descriptor framework. RESULTS Thirty-eight studies were included. Fifty-one resistance exercises were extracted and categorized as isometric exercises (n = 20), heel raises (n = 6), strengthening with external resistance (n = 13), or unspecified (n = 12). A median of 8 (interquartile range, 6-10) of a possible 19 CERT items was reported. The amount of items described of the 13 Toigo and and Boutellier exercise descriptors ranged from 0 to 11. CONCLUSION A variety of resistance exercises targeted at the ankle plantar flexors were used as part of early functional rehabilitation after Achilles tendon rupture. However, most studies provided inadequate description of resistance exercise interventions. J Orthop Sports Phys Ther 2020;50(12):681-691. Epub 23 Oct 2020. doi:10.2519/jospt.2020.9463.
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Ghoula M, Le Marec A, Magnan C, Le Stunff H, Taboureau O. Identification of the Interactions Interference Between the PH and START Domain of CERT by Limonoid and HPA Inhibitors. Front Mol Biosci 2020; 7:603983. [PMID: 33330630 PMCID: PMC7729066 DOI: 10.3389/fmolb.2020.603983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 11/04/2020] [Indexed: 11/13/2022] Open
Abstract
The multi domain ceramide transfer protein (CERT) which contains the domains START and PH, is a protein that allows the transport of ceramide from the endoplasmic reticulum to the Golgi and so it plays a major role in sphingolipid metabolism. Recently, the crystal structure of the PH-START complex has been released, suggesting an inhibitory action of START to the binding of the PH domain to the Golgi apparatus and thus limiting the CERT activity. Our study presents a combination of docking and molecular dynamic simulations of N-(3-hydroxy-1-hydroxymethyl-3-phenylpropyl)alkanamides (HPA) analogs and limonoids compounds known to inhibit CERT. Through our computational study, we compared the binding affinity of 14 ligands at both domains (START and PH) and also at the START-PH interface, including several mutations known to play a role in the CERT’s activity. At the difference of HPA compounds, limonoids have a stronger binding affinity for the START-PH interface. Furthermore, 2 inhibitors (HPA-12 and isogedunin) were investigated through molecular dynamic (MD) simulations. 50 ns of molecular dynamic simulations have displayed the stability of isogedunin as well as keys residues in the binding of this molecule at the interface of the PH-START complex. Therefore, this study suggests a novel inhibitory mechanism of CERT for limonoid compounds involving the stabilization of the START-PH interface. This could help to develop new and potentially more selective inhibitors of this transporter, which is a potent target in cancer therapy.
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Affiliation(s)
- Mariem Ghoula
- Université de Paris, INSERM U1133, CNRS UMR 8251, Paris, France
| | | | | | - Hervé Le Stunff
- Université Paris Saclay, Institut des Neurosciences Paris Saclay, CNRS UMR 9197, Orsay, France
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Castellan T, Santos C, Rodriguez F, Lepage ML, Liang Y, Bodlenner A, Compain P, Génisson Y, Dehoux C, Ballereau S. N,O-Dialkyl deoxynojirimycin derivatives as CERT START domain ligands. Bioorg Med Chem Lett 2019; 30:126796. [PMID: 31757669 DOI: 10.1016/j.bmcl.2019.126796] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 10/17/2019] [Accepted: 10/30/2019] [Indexed: 10/25/2022]
Abstract
Dysregulation of the ceramide transport protein CERT is associated to diseases such as cancer. In search for new CERT START domain ligands, N-dodecyl-deoxynojirimycin (N-dodecyl-DNJ) iminosugar was found to display, as a ceramide mimic, significant protein recognition. To reinforce the lipophilic interactions and strengthen this protein binding, a docking study was carried out in order to select the optimal position on which to introduce an additional O-alkyl chain on N-dodecyl-DNJ. Analysis of the calculated poses for three different regioisomers indicated an optimal calculated interaction pattern for N,O3-didodecyl-DNJ. The two most promising regioisomers were prepared by a divergent route and their binding to the CERT START domain was evaluated with fluorescence intensity (FLINT) binding assay. N,O3-didodecyl-DNJ was confirmed to be a new binder prototype with level of protein recognition in the FLINT assay comparable to the best known ligands from the alkylated HPA-12 series. This work opens promising perspectives for the development of new inhibitors of CERT-mediated ceramide trafficking.
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Affiliation(s)
- Tessa Castellan
- SPCMIB, UMR5068 CNRS-Université Paul Sabatier-Toulouse III, 118 route de Narbonne, Toulouse F-31062, France
| | - Cécile Santos
- SPCMIB, UMR5068 CNRS-Université Paul Sabatier-Toulouse III, 118 route de Narbonne, Toulouse F-31062, France
| | - Frédéric Rodriguez
- SPCMIB, UMR5068 CNRS-Université Paul Sabatier-Toulouse III, 118 route de Narbonne, Toulouse F-31062, France
| | - Mathieu L Lepage
- Laboratoire d'Innovation Moléculaire et Applications (LIMA), Univ. de Strasbourg
- Univ. de Haute-Alsace
- CNRS (UMR 7042), Equipe de Synthèse Organique et Molécules Bioactives (SYBIO), ECPM, 25 Rue Becquerel, 67000 Strasbourg, France
| | - Yan Liang
- Laboratoire d'Innovation Moléculaire et Applications (LIMA), Univ. de Strasbourg
- Univ. de Haute-Alsace
- CNRS (UMR 7042), Equipe de Synthèse Organique et Molécules Bioactives (SYBIO), ECPM, 25 Rue Becquerel, 67000 Strasbourg, France
| | - Anne Bodlenner
- Laboratoire d'Innovation Moléculaire et Applications (LIMA), Univ. de Strasbourg
- Univ. de Haute-Alsace
- CNRS (UMR 7042), Equipe de Synthèse Organique et Molécules Bioactives (SYBIO), ECPM, 25 Rue Becquerel, 67000 Strasbourg, France
| | - Philippe Compain
- Laboratoire d'Innovation Moléculaire et Applications (LIMA), Univ. de Strasbourg
- Univ. de Haute-Alsace
- CNRS (UMR 7042), Equipe de Synthèse Organique et Molécules Bioactives (SYBIO), ECPM, 25 Rue Becquerel, 67000 Strasbourg, France
| | - Yves Génisson
- SPCMIB, UMR5068 CNRS-Université Paul Sabatier-Toulouse III, 118 route de Narbonne, Toulouse F-31062, France
| | - Cécile Dehoux
- SPCMIB, UMR5068 CNRS-Université Paul Sabatier-Toulouse III, 118 route de Narbonne, Toulouse F-31062, France
| | - Stéphanie Ballereau
- SPCMIB, UMR5068 CNRS-Université Paul Sabatier-Toulouse III, 118 route de Narbonne, Toulouse F-31062, France.
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Tachida Y, Kumagai K, Sakai S, Ando S, Yamaji T, Hanada K. Chlamydia trachomatis-infected human cells convert ceramide to sphingomyelin without sphingomyelin synthases 1 and 2. FEBS Lett 2019; 594:519-529. [PMID: 31596951 DOI: 10.1002/1873-3468.13632] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 09/27/2019] [Accepted: 09/27/2019] [Indexed: 12/19/2022]
Abstract
The obligate intracellular bacterium Chlamydia trachomatis proliferates in the membranous compartment inclusion formed in host cells. The host ceramide transport protein CERT delivers ceramide from the endoplasmic reticulum to the Golgi complex for the synthesis of sphingomyelin (SM). Chlamydia trachomatis has been suggested to employ CERT to produce SM in the inclusion by host SM synthases (SMSs). Here, we found that C. trachomatis proliferates and produces infective progeny even in SMS1 and SMS2 double-knockout HeLa cells, but not in the SMS1/SMS2/CERT triple-knockout cells. Interestingly, infected cells convert ceramide to SM without host SMSs. These results suggest that C. trachomatis-infected cells can convert ceramide to SM without host SMSs after CERT-mediated transfer of ceramide to the inclusions.
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Affiliation(s)
- Yuriko Tachida
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Shinjuku-ku, Japan
| | - Keigo Kumagai
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Shinjuku-ku, Japan
| | - Shota Sakai
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Shinjuku-ku, Japan
| | - Shuji Ando
- Department of Virology I, National Institute of Infectious Diseases, Shinjuku-ku, Japan
| | - Toshiyuki Yamaji
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Shinjuku-ku, Japan
| | - Kentaro Hanada
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Shinjuku-ku, Japan
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Coronado-Delgado DA, Garnica-Garza HM. Combined Megavoltage and Contrast-Enhanced Radiotherapy as an Intrafraction Motion Management Strategy in Lung SBRT. Technol Cancer Res Treat 2019; 18:1533033819883639. [PMID: 31630665 PMCID: PMC6801896 DOI: 10.1177/1533033819883639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Using Monte Carlo simulation and a realistic patient model, it is shown that the volume
of healthy tissue irradiated at therapeutic doses can be drastically reduced using a
combination of standard megavoltage and kilovoltage X-ray beams with a contrast agent
previously loaded into the tumor, without the need to reduce standard treatment margins.
Four-dimensional computed tomography images of 2 patients with a centrally located and a
peripherally located tumor were obtained from a public database and subsequently used to
plan robotic stereotactic body radiotherapy treatments. Two modalities are assumed:
conventional high-energy stereotactic body radiotherapy and a treatment with contrast
agent loaded in the tumor and a kilovoltage X-ray beam replacing the megavoltage beam
(contrast-enhanced radiotherapy). For each patient model, 2 planning target volumes were
designed: one following the recommendations from either Radiation Therapy Oncology Group
(RTOG) 0813 or RTOG 0915 task group depending on the patient model and another with a 2-mm
uniform margin determined solely on beam penumbra considerations. The optimized treatments
with RTOG margins were imparted to the moving phantom to model the dose distribution that
would be obtained as a result of intrafraction motion. Treatment plans are then compared
to the plan with the 2-mm uniform margin considered to be the ideal plan. It is shown that
even for treatments in which only one-fifth of the total dose is imparted via the
contrast-enhanced radiotherapy modality and with the use of standard treatment margins,
the resultant absorbed dose distributions are such that the volume of healthy tissue
irradiated to high doses is close to what is obtained under ideal conditions
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Lin EC, Li H, Zu Z, Louie EA, Lankford CL, Dortch RD, Does MD, Gore JC, Gochberg DF. Chemical exchange rotation transfer ( CERT) on human brain at 3 Tesla. Magn Reson Med 2018; 80:2609-2617. [PMID: 29802641 PMCID: PMC6252284 DOI: 10.1002/mrm.27365] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 03/23/2018] [Accepted: 04/24/2018] [Indexed: 12/14/2022]
Abstract
PURPOSE To test the ability of a novel pulse sequence applied in vivo at 3 Tesla to separate the contributions to the water signal from amide proton transfer (APT) and relayed nuclear Overhauser enhancement (rNOE) from background direct water saturation and semisolid magnetization transfer (MT). The lack of such signal source isolation has confounded conventional chemical exchange saturation transfer (CEST) imaging. METHODS We quantified APT and rNOE signals using a chemical exchange rotation transfer (CERT) metric, MTRdouble . A range of duty cycles and average irradiation powers were applied, and results were compared with conventional CEST analyses using asymmetry (MTRasym ) and extrapolated magnetization transfer (EMR). RESULTS Our results indicate that MTRdouble is more specific than MTRasym and, because it requires as few as 3 data points, is more rapid than methods requiring a complete Z-spectrum, such as EMR. In white matter, APT (1.5 ± 0.5%) and rNOE (2.1 ± 0.7%) were quantified by using MTRdouble with a 30% duty cycle and a 0.5-µT average power. In addition, our results suggest that MTRdouble is insensitive to B0 inhomogeneity, further magnifying its speed advantage over CEST metrics that require a separate B0 measurement. However, MTRdouble still has nontrivial sensitivity to B1 inhomogeneities. CONCLUSION We demonstrated that MTRdouble is an alternative metric to evaluate APT and rNOE, which is fast, robust to B0 inhomogeneity, and easy to process.
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Affiliation(s)
- Eugene C. Lin
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Hua Li
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Zhongliang Zu
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Elizabeth A. Louie
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Chris L. Lankford
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
| | - Richard D. Dortch
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN
| | - Mark D. Does
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN
| | - John C. Gore
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN
- Deparment of Physics and Astronomy, Vanderbilt University, Nashville, TN
- Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee, USA
| | - Daniel F. Gochberg
- Vanderbilt University Institute of Imaging Science, Nashville, TN
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN
- Deparment of Physics and Astronomy, Vanderbilt University, Nashville, TN
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27
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Roussel É, Lippé R. Cellular Protein Kinase D Modulators Play a Role during Multiple Steps of Herpes Simplex Virus 1 Egress. J Virol 2018; 92:e01486-18. [PMID: 30232182 DOI: 10.1128/JVI.01486-18] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 09/14/2018] [Indexed: 12/12/2022] Open
Abstract
The assembly of new herpes simplex virus 1 (HSV-1) particles takes place in the nucleus. These particles then travel across the two nuclear membranes and acquire a final envelope from a cellular compartment. The contribution of the cell to the release of the virus is, however, little known. We previously demonstrated, using a synchronized infection, that the host protein kinase D and diacylglycerol, a lipid that recruits the kinase to the trans-Golgi network (TGN), promote the release of the virus from that compartment. Given the role this cellular protein plays in the herpes simplex virus 1 life cycle and the many molecules that modulate its activity, we aimed to determine to what extent this virus utilizes the protein kinase D pathway during a nonsynchronized infection. Several molecular protein kinase D (PKD) regulators were targeted by RNA interference and viral production monitored. Surprisingly, many of these modulators negatively impacted the extracellular release of the virus. Overexpression studies, the use of pharmacological reagents, and assays to monitor intracellular lipids implicated in the biology of PKD suggested that these effects were oddly independent of total intracellular diacylglycerol levels. Instead, mapping of the viral intermediates by electron microscopy suggested that some of these modulators could regulate distinct steps along the viral egress pathway, notably nuclear egress. Altogether, this suggests a more complex contribution of PKD to HSV-1 egress than originally anticipated and new research avenues to explore.IMPORTANCE Viruses are obligatory parasites that highjack numerous cellular functions. This is certainly true when it comes to transporting viral particles within the cell. Herpesviruses share the unique property of traveling through the two nuclear membranes by subsequent budding and fusion and acquiring their final envelope from a cellular organelle. Albeit disputed, the overall evidence from many laboratories points to the trans-Golgi network (TGN) as the source of that membrane. Moreover, past findings revealed that the host protein kinase D (PKD) plays an important role at that stage, which is significant given the known implication of that protein in vesicular transport. The present findings suggest that the PKD machinery not only affects the late stages of herpes simplex virus I egress but also modulates earlier steps, such as nuclear egress. This opens up new means to control these viruses.
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Sugiki T, Egawa D, Kumagai K, Kojima C, Fujiwara T, Takeuchi K, Shimada I, Hanada K, Takahashi H. Phosphoinositide binding by the PH domain in ceramide transfer protein ( CERT) is inhibited by hyperphosphorylation of an adjacent serine-repeat motif. J Biol Chem 2018; 293:11206-11217. [PMID: 29848549 DOI: 10.1074/jbc.ra118.002465] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 05/24/2018] [Indexed: 12/13/2022] Open
Abstract
Sphingolipids such as ceramide are important constituents of cell membranes. The ceramide transfer protein (CERT) moves ceramide from the endoplasmic reticulum to the Golgi apparatus in a nonvesicular manner. Hyperphosphorylation of the serine-repeat motif (SRM) adjacent to the pleckstrin homology (PH) domain of CERT down-regulates the inter-organelle ceramide transport function of CERT. However, the mechanistic details of this down-regulation remain elusive. Using solution NMR and binding assays, we herein show that a hyperphosphorylation-mimetic CERT variant in which 10 serine/threonine residues of SRM had been replaced with glutamate residues (the 10E variant) displays an intramolecular interaction between SRM and positively charged regions of the PH domain, which are involved in the binding of this domain to phosphatidylinositol 4-monophosphate (PI4P). Of note, the binding of the PH domain to PI4P-embedded membranes was attenuated by the SRM 10E substitutions in cell-free assays. Moreover, the 10E substitutions reduced the Golgi-targeting activity of the PH-SRM construct in living cells. These results indicate that hyperphosphorylated SRM directly interacts with the surface of the PH domain in an intramolecular manner, thereby decreasing the PI4P-binding activity of the PH domain. In light of these findings, we propose that the hyperphosphorylation of SRM may trigger the dissociation of CERT from the Golgi apparatus, resulting in a functionally less active conformation of CERT.
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Affiliation(s)
- Toshihiko Sugiki
- From the Graduate School of Pharmaceutical Sciences, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,the Japan Biological Informatics Consortium (JBiC), Aomi, Koto-ku, Tokyo 135-8073, Japan.,the Biomedicinal Information Research Center (BIRC), National Institute of Advanced Industrial Science and Technology (AIST), Aomi, Koto-ku, Tokyo 135-0064, Japan.,the Institute for Protein Research, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Daichi Egawa
- the Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Keigo Kumagai
- the Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Chojiro Kojima
- the Institute for Protein Research, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan.,the Graduate School and Faculty of Engineering, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan, and
| | - Toshimichi Fujiwara
- the Institute for Protein Research, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Koh Takeuchi
- the Biomedicinal Information Research Center (BIRC), National Institute of Advanced Industrial Science and Technology (AIST), Aomi, Koto-ku, Tokyo 135-0064, Japan
| | - Ichio Shimada
- From the Graduate School of Pharmaceutical Sciences, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,the Biomedicinal Information Research Center (BIRC), National Institute of Advanced Industrial Science and Technology (AIST), Aomi, Koto-ku, Tokyo 135-0064, Japan
| | - Kentaro Hanada
- the Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Toyama, Shinjuku-ku, Tokyo 162-8640, Japan,
| | - Hideo Takahashi
- the Biomedicinal Information Research Center (BIRC), National Institute of Advanced Industrial Science and Technology (AIST), Aomi, Koto-ku, Tokyo 135-0064, Japan, .,the Graduate School of Medical Life Science, Yokohama City University, Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan
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29
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Xie Z, Hur SK, Zhao L, Abrams CS, Bankaitis VA. A Golgi Lipid Signaling Pathway Controls Apical Golgi Distribution and Cell Polarity during Neurogenesis. Dev Cell 2018; 44:725-740.e4. [PMID: 29587143 DOI: 10.1016/j.devcel.2018.02.025] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 01/03/2018] [Accepted: 02/26/2018] [Indexed: 11/22/2022]
Abstract
Phosphatidylinositol (PtdIns) transfer proteins (PITPs) stimulate PtdIns-4-P synthesis and signaling in eukaryotic cells, but to what biological outcomes such signaling circuits are coupled remains unclear. Herein, we show that two highly related StART-like PITPs, PITPNA and PITPNB, act in a redundant fashion to support development of the embryonic mammalian neocortex. PITPNA/PITPNB do so by driving PtdIns-4-P-dependent recruitment of GOLPH3, and likely ceramide transfer protein (CERT), to Golgi membranes with GOLPH3 recruitment serving to promote MYO18A- and F-actin-directed loading of the Golgi network to apical processes of neural stem cells (NSCs). We propose the primary role for PITP/PtdIns-4-P/GOLPH3/CERT signaling in NSC Golgi is not in regulating bulk membrane trafficking but in optimizing apically directed membrane trafficking and/or apical membrane signaling during neurogenesis.
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Abstract
Sphingomyelin (SM) biosynthesis represents a complex, finely regulated process, mostly occurring in vertebrates. It is intimately linked to lipid transport and it is ultimately carried out by two enzymes, SM synthase 1 and 2, selectively localized in the Golgi and plasma membrane. In the course of the SM biosynthetic reaction, various lipids are metabolized. Because these lipids have both structural and signaling functions, the SM biosynthetic process has the potential to affect diverse important cellular processes (such as cell proliferation, cell survival, and migration). Thus defects in SM biosynthesis might directly or indirectly impact the normal physiology of the cell and eventually of the organism. In this chapter, we will focus on evidence supporting a role for SM biosynthesis in specific cellular functions and how its dysregulation can affect neoplastic transformation.
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Affiliation(s)
- Giovanni D'Angelo
- Institute of Protein Biochemistry, National Research Council of Italy, Naples, Italy
| | - Sitapriya Moorthi
- Department of Physiology and Biophysics, Stony Brook University, Stony Brook, NY, United States
| | - Chiara Luberto
- Department of Physiology and Biophysics, Stony Brook University, Stony Brook, NY, United States
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31
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Palau VE, Chakraborty K, Wann D, Lightner J, Hilton K, Brannon M, Stone W, Krishnan K. γ-Tocotrienol induces apoptosis in pancreatic cancer cells by upregulation of ceramide synthesis and modulation of sphingolipid transport. BMC Cancer 2018; 18:564. [PMID: 29769046 PMCID: PMC5956825 DOI: 10.1186/s12885-018-4462-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 04/30/2018] [Indexed: 11/27/2022] Open
Abstract
Background Ceramide synthesis and metabolism is a promising target in cancer drug development. γ-tocotrienol (GT3), a member of the vitamin E family, orchestrates multiple effects that ensure the induction of apoptosis in both, wild-type and RAS-mutated pancreatic cancer cells. Here, we investigated whether these effects involve changes in ceramide synthesis and transport. Methods The effects of GT3 on the synthesis of ceramide via the de novo pathway, and the hydrolysis of sphingomyelin were analyzed by the expression levels of the enzymes serine palmitoyl transferase, ceramide synthase-6, and dihydroceramide desaturase, and acid sphingomyelinase in wild-type RAS BxPC3, and RAS-mutated MIA PaCa-2 and Panc 1 pancreatic cancer cells. Quantitative changes in ceramides, dihydroceramides, and sphingomyelin at the cell membrane were detected by LCMS. Modulation of ceramide transport by GT3 was studied by immunochemistry of CERT and ARV-1, and the subsequent effects at the cell membrane was analyzed via immunofluorescence of ceramide, caveolin, and DR5. Results GT3 favors the upregulation of ceramide by stimulating synthesis at the ER and the plasma membrane. Additionally, the conversion of newly synthesized ceramide to sphingomyelin and glucosylceramide at the Golgi is prevented by the inhibition of CERT. Modulation ARV1 and previously observed inhibition of the HMG-CoA pathway, contribute to changes in membrane structure and signaling functions, allows the clustering of DR5, effectively initiating apoptosis. Conclusions Our results suggest that GT3 targets ceramide synthesis and transport, and that the upregulation of ceramide and modulation of transporters CERT and ARV1 are important contributors to the apoptotic properties demonstrated by GT3 in pancreatic cancer cells.
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Affiliation(s)
- Victoria E Palau
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA.,Department of Pharmaceutical Sciences, Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Kanishka Chakraborty
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Daniel Wann
- Department of Internal Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA
| | - Janet Lightner
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Keely Hilton
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Marianne Brannon
- Department of Pediatrics, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - William Stone
- Department of Pediatrics, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Koyamangalath Krishnan
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA.
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32
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Gochberg DF, Does MD, Zu Z, Lankford CL. Towards an analytic solution for pulsed CEST. NMR Biomed 2018; 31:e3903. [PMID: 29460973 PMCID: PMC5935132 DOI: 10.1002/nbm.3903] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 12/26/2017] [Accepted: 01/05/2018] [Indexed: 05/10/2023]
Abstract
Chemical exchange saturation transfer (CEST) is an imaging method based on magnetization exchange between solutes and water. This exchange generates changes in the measured signal after off-resonance radiofrequency irradiation. Although the analytic solution for CEST with continuous wave (CW) irradiation has been determined, most studies are performed using pulsed irradiation. In this work, we derive an analytic solution for the CEST signal after pulsed irradiation that includes both short-time rotation effects and long-time saturation effects in a two-pool system corresponding to water and a low-concentration exchanging solute pool. Several approximations are made to balance the accuracy and simplicity of the resulting analytic form, which is tested against numerical solutions of the coupled Bloch equations and is found to be largely accurate for amides at high fields, but less accurate at the higher exchange rates, lower offsets and typically higher irradiation powers of amines.
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Affiliation(s)
- Daniel F Gochberg
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA
| | - Mark D Does
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
- Department of Electrical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Zhongliang Zu
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA
| | - Christopher L Lankford
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
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Mack DE, Wilson PM, Santos E, Brooks K. Standards of reporting: the use of CONSORT PRO and CERT in individuals living with osteoporosis. Osteoporos Int 2018; 29:305-313. [PMID: 28971256 DOI: 10.1007/s00198-017-4249-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 09/26/2017] [Indexed: 12/29/2022]
Abstract
The Consolidated Standards of Reporting Trials for Patient-Reported Outcomes (CONSORT PRO) and the Consensus on Exercise Reporting Template (CERT) have been developed to improve the quality and transparency of reporting standards in scientific research. The purpose of this study was to provide evidence for the adoption of CONSORT PRO and CERT by researchers examining the link between exercise and quality of life in individuals living with osteoporosis. A systematic search was conducted to identify randomized control trials published in English evaluating exercise interventions on quality of life in individuals living with osteoporosis. Reporting standards were assessed using CONSORT PRO and CERT. A total of 127 studies were identified with 23 meeting inclusion criteria. "Good" evidence for eight (42.1%) CONSORT PRO and two (12.5%) CERT items was found. Adherence to CONSORT PRO was not related to the year of publication, journal impact factor, or study quality. Adherence to CONSORT PRO and CERT reporting standards is inadequate in the literature examining exercise interventions on quality of life in individuals living with osteoporosis. Sufficient reporting is paramount to knowledge translation, interpretation by interventionists, and clinician confidence in understanding if (and how) exercise is associated with quality of life outcomes in this cohort. Concerns associated with failure to include this information are highlighted.
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Affiliation(s)
- D E Mack
- Behavioural Health Sciences Research Lab, Centre for Bone and Muscle Health, Department of Kinesiology, Brock University, 287 Walker Complex, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada.
| | - P M Wilson
- Behavioural Health Sciences Research Lab, Centre for Bone and Muscle Health, Department of Kinesiology, Brock University, 287 Walker Complex, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - E Santos
- Behavioural Health Sciences Research Lab, Faculty of Applied Health Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - K Brooks
- Behavioural Health Sciences Research Lab, Faculty of Applied Health Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
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Van der Kleij R, Kleinhuis G, Young H. Computer Security Incident Response Team Effectiveness: A Needs Assessment. Front Psychol 2017; 8:2179. [PMID: 29312051 PMCID: PMC5733042 DOI: 10.3389/fpsyg.2017.02179] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 11/29/2017] [Indexed: 11/24/2022] Open
Abstract
Computer security incident response teams (CSIRTs) respond to a computer security incident when the need arises. Failure of these teams can have far-reaching effects for the economy and national security. CSIRTs often have to work on an ad hoc basis, in close cooperation with other teams, and in time constrained environments. It could be argued that under these working conditions CSIRTs would be likely to encounter problems. A needs assessment was done to see to which extent this argument holds true. We constructed an incident response needs model to assist in identifying areas that require improvement. We envisioned a model consisting of four assessment categories: Organization, Team, Individual and Instrumental. Central to this is the idea that both problems and needs can have an organizational, team, individual, or technical origin or a combination of these levels. To gather data we conducted a literature review. This resulted in a comprehensive list of challenges and needs that could hinder or improve, respectively, the performance of CSIRTs. Then, semi-structured in depth interviews were held with team coordinators and team members of five public and private sector Dutch CSIRTs to ground these findings in practice and to identify gaps between current and desired incident handling practices. This paper presents the findings of our needs assessment and ends with a discussion of potential solutions to problems with performance in incident response.
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Affiliation(s)
- Rick Van der Kleij
- Behavioural and Societal Sciences, Department of Human Behavior and Organizational Innovations, Netherlands Organisation for Applied Scientific Research (TNO), Soesterberg, Netherlands.,Centre of Expertise Cyber Security, The Hague University of Applied Sciences, The Hague, Netherlands
| | - Geert Kleinhuis
- Technical Sciences, Department of Cyber Security and Robustness, Netherlands Organisation for Applied Scientific Research (TNO), Groningen, Netherlands
| | - Heather Young
- Behavioural and Societal Sciences, Department of Human Behavior and Organizational Innovations, Netherlands Organisation for Applied Scientific Research (TNO), Soesterberg, Netherlands
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Hanada K. Ceramide Transport from the Endoplasmic Reticulum to the Trans Golgi Region at Organelle Membrane Contact Sites. Adv Exp Med Biol 2017; 997:69-81. [PMID: 28815522 DOI: 10.1007/978-981-10-4567-7_5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Lipids are the major constituents of all cell membranes and play dynamic roles in organelle structure and function. Although the spontaneous transfer of lipids between different membranes rarely occurs, lipids are appropriately transported between different organelles for their metabolism and to exert their functions in living cells. Proteins that have the biochemical capability to catalyze the intermembrane transfer of lipids are called lipid transfer proteins (LTPs). All organisms possess many types of LTPs. Recent studies revealed that LTPs are key players in the interorganelle transport of lipids at organelle membrane contact sites (MCSs). This chapter depicts how LTPs rationally operate at MCSs by using the ceramide transport protein CERT as a typical model for the LTP-mediated interorganelle transport of lipids.
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Yamaji T, Horie A, Tachida Y, Sakuma C, Suzuki Y, Kushi Y, Hanada K. Role of Intracellular Lipid Logistics in the Preferential Usage of Very Long Chain-Ceramides in Glucosylceramide. Int J Mol Sci 2016; 17:ijms17101761. [PMID: 27775668 PMCID: PMC5085785 DOI: 10.3390/ijms17101761] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 10/11/2016] [Accepted: 10/14/2016] [Indexed: 11/16/2022] Open
Abstract
Ceramide is a common precursor of sphingomyelin (SM) and glycosphingolipids (GSLs) in mammalian cells. Ceramide synthase 2 (CERS2), one of the six ceramide synthase isoforms, is responsible for the synthesis of very long chain fatty acid (C20–26 fatty acids) (VLC)-containing ceramides (VLC-Cer). It is known that the proportion of VLC species in GSLs is higher than that in SM. To address the mechanism of the VLC-preference of GSLs, we used genome editing to establish three HeLa cell mutants that expressed different amounts of CERS2 and compared the acyl chain lengths of SM and GSLs by metabolic labeling experiments. VLC-sphingolipid expression was increased along with that of CERS2, and the proportion of VLC species in glucosylceramide (GlcCer) was higher than that in SM for all expression levels of CERS2. This higher proportion was still maintained even when the proportion of C16-Cer to the total ceramides was increased by disrupting the ceramide transport protein (CERT)-dependent C16-Cer delivery pathway for SM synthesis. On the other hand, merging the Golgi apparatus and the endoplasmic reticulum (ER) by Brefeldin A decreased the proportion of VLC species in GlcCer probably due to higher accessibility of UDP-glucose ceramide glucosyltransferase (UGCG) to C16-rich ceramides. These results suggest the existence of a yet-to-be-identified mechanism rendering VLC-Cer more accessible than C16-Cer to UGCG, which is independent of CERT.
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Affiliation(s)
- Toshiyuki Yamaji
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.
| | - Aya Horie
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Chiyoda-ku, Tokyo 101-8308, Japan.
| | - Yuriko Tachida
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.
| | - Chisato Sakuma
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.
| | - Yusuke Suzuki
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Chiyoda-ku, Tokyo 101-8308, Japan.
| | - Yasunori Kushi
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Chiyoda-ku, Tokyo 101-8308, Japan.
| | - Kentaro Hanada
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.
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Santos C, Fleury L, Rodriguez F, Markus J, Berkeš D, Daïch A, Ausseil F, Baudoin-Dehoux C, Ballereau S, Génisson Y. The CERT antagonist HPA-12: first practical synthesis and individual binding evaluation of the four stereoisomers. Bioorg Med Chem 2015; 23:2004-9. [PMID: 25818765 DOI: 10.1016/j.bmc.2015.03.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 03/02/2015] [Accepted: 03/05/2015] [Indexed: 11/30/2022]
Abstract
The first unified synthetic route to the four enantiopure HPA-12 stereoisomers in multi-gram scale is reported based on Crystallization-Induced Asymmetric Transformation (CIAT) technology. This preparative stereoselective synthesis allowed the unprecedented comparative evaluation of HPA-12 stereoisomers regarding their interaction with the CERT START domain. In vitro binding assay coupled to in silico docking approach indicate a possible interaction for the four derivatives. The first TR-FRET homogeneous-phase assay was developed to quantify their binding to the START domain, allowing complete determination of HPA-12 EC₅₀. Results indicate that not only the (1R,3S) lead to the strongest binding, but that both 1R and 3S stereocenters similarly contribute to extent of recognition This automated homogenous assay further opens up promising prospect for the identification of novel potential CERT antagonist by means of high throughput screening.
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Affiliation(s)
- Cécile Santos
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118, route de Narbonne, F-31062 Toulouse Cedex 9, France
| | - Laurence Fleury
- Unité de Service et de Recherche CNRS-Pierre Fabre n°3388 ETaC, CRDPF, 3 avenue H. Curien, 31035 Toulouse Cedex 01, France
| | - Frédéric Rodriguez
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118, route de Narbonne, F-31062 Toulouse Cedex 9, France
| | - Jozef Markus
- Department of Organic Chemistry, Slovak University of Technology, Radlinského 9, 81237 Bratislava, Slovakia
| | - Dušan Berkeš
- Department of Organic Chemistry, Slovak University of Technology, Radlinského 9, 81237 Bratislava, Slovakia.
| | - Adam Daïch
- URCOM, EA 3221, INC3M CNRS FR-3038, UFR Sciences & Techniques, University of Le Havre, 25, rue Philippe Lebon, B.P. 540, F-76058 Le Havre Cedex, France
| | - Frédéric Ausseil
- Unité de Service et de Recherche CNRS-Pierre Fabre n°3388 ETaC, CRDPF, 3 avenue H. Curien, 31035 Toulouse Cedex 01, France
| | - Cécile Baudoin-Dehoux
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118, route de Narbonne, F-31062 Toulouse Cedex 9, France
| | - Stéphanie Ballereau
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118, route de Narbonne, F-31062 Toulouse Cedex 9, France.
| | - Yves Génisson
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118, route de Narbonne, F-31062 Toulouse Cedex 9, France.
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Yamaji T, Hanada K. Sphingolipid metabolism and interorganellar transport: localization of sphingolipid enzymes and lipid transfer proteins. Traffic 2014; 16:101-22. [PMID: 25382749 DOI: 10.1111/tra.12239] [Citation(s) in RCA: 277] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 10/29/2014] [Accepted: 11/06/2014] [Indexed: 11/28/2022]
Abstract
In recent decades, many sphingolipid enzymes, sphingolipid-metabolism regulators and sphingolipid transfer proteins have been isolated and characterized. This review will provide an overview of the intracellular localization and topology of sphingolipid enzymes in mammalian cells to highlight the locations where respective sphingolipid species are produced. Interestingly, three sphingolipids that reside or are synthesized in cytosolic leaflets of membranes (ceramide, glucosylceramide and ceramide-1-phosphate) all have cytosolic lipid transfer proteins (LTPs). These LTPs consist of ceramide transfer protein (CERT), four-phosphate adaptor protein 2 (FAPP2) and ceramide-1-phosphate transfer protein (CPTP), respectively. These LTPs execute functions that affect both the location and metabolism of the lipids they bind. Molecular details describing the mechanisms of regulation of LTPs continue to emerge and reveal a number of critical processes, including competing phosphorylation and dephosphorylation reactions and binding interactions with regulatory proteins and lipids that influence the transport, organelle distribution and metabolism of sphingolipids.
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Affiliation(s)
- Toshiyuki Yamaji
- Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
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Lalot F, Delplanque S, Sander D. Mindful regulation of positive emotions: a comparison with reappraisal and expressive suppression. Front Psychol 2014; 5:243. [PMID: 24715882 PMCID: PMC3970027 DOI: 10.3389/fpsyg.2014.00243] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 03/04/2014] [Indexed: 11/13/2022] Open
Abstract
It is often acknowledged that mindfulness facilitates emotion regulation on a long-term scale. Only few empirical studies support the hypothesis that even a brief mindfulness induction among subjects without previous experience of meditation allows an effective reduction of both positive and negative emotions. To the best of our knowledge, this hypothesis has never been tested when comparing mindfulness to other regulation strategies known to be effective. The current study investigates the effects of mindfulness, reappraisal and expressive suppression during the regulation of positive emotions. Forty-five participants without previous meditation experience watched four positive video clips while applying a specific regulation strategy: mindful attention, reappraisal, expressive suppression or no strategy (control condition). Video clips were matched for intensity and positive emotions index. Each of them was evaluated on two dimensions, valence (negative/positive) and arousal (calming/exciting). Moreover, participants' facial expressions were recorded during the presentation of the video clips. Results showed that (a) participants report less positive affect in reappraisal and mindful attention conditions compared to expression suppression and a control condition; and (b) the facialexpression - activation of AU12 (lip corner pull) and AU6 (cheek raiser) - varies with the regulation strategy applied. Results demonstrate the effectiveness of mindfulness in decreasing both the evaluative judgment of positive video clips and the related facial expression, among participants without previous mindfulness experience.
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Affiliation(s)
- Fanny Lalot
- Faculty of Psychology and Educational Sciences, University of GenevaGeneva, Switzerland
- Distance Learning University of SwitzerlandBrig, Switzerland
| | - Sylvain Delplanque
- Faculty of Psychology and Educational Sciences, University of GenevaGeneva, Switzerland
- Swiss Center for Affective Sciences, University of GenevaGeneva, Switzerland
| | - David Sander
- Faculty of Psychology and Educational Sciences, University of GenevaGeneva, Switzerland
- Swiss Center for Affective Sciences, University of GenevaGeneva, Switzerland
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Ishibashi Y, Kohyama-Koganeya A, Hirabayashi Y. New insights on glucosylated lipids: metabolism and functions. Biochim Biophys Acta Mol Cell Biol Lipids 2013; 1831:1475-85. [PMID: 23770033 DOI: 10.1016/j.bbalip.2013.06.001] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 06/01/2013] [Accepted: 06/04/2013] [Indexed: 01/05/2023]
Abstract
Ceramide, cholesterol, and phosphatidic acid are major basic structures for cell membrane lipids. These lipids are modified with glucose to generate glucosylceramide (GlcCer), cholesterylglucoside (ChlGlc), and phosphatidylglucoside (PtdGlc), respectively. Glucosylation dramatically changes the functional properties of lipids. For instance, ceramide acts as a strong tumor suppressor that causes apoptosis and cell cycle arrest, while GlcCer has an opposite effect, downregulating ceramide activities. All glucosylated lipids are enriched in lipid rafts or microdomains and play fundamental roles in a variety of cellular processes. In this review, we discuss the biological functions and metabolism of these three glucosylated lipids.
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Affiliation(s)
- Yohei Ishibashi
- Laboratory for Molecular Membrane Neuroscience, RIKEN Brain Science Institute, Wako, Saitama, Japan
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Abstract
Sphingomyelin (SM) is a dominant sphingolipid in membranes of mammalian cells and this lipid class is specifically enriched in the plasma membrane, the endocytic recycling compartment, and the trans Golgi network. The distribution of SM and cholesterol among cellular compartments correlate. Sphingolipids have extensive hydrogen-bonding capabilities which together with their saturated nature facilitate the formation of sphingolipid and SM-enriched lateral domains in membranes. Cholesterol prefers to interact with SMs and this interaction has many important functional consequences. In this review, the synthesis, regulation, and intracellular distribution of SMs are discussed. The many direct roles played by membrane SM in various cellular functions and processes will also be discussed. These include involvement in the regulation of endocytosis and receptor-mediated ligand uptake, in ion channel and G-protein coupled receptor function, in protein sorting, and functioning as receptor molecules for various bacterial toxins, and for non-bacterial pore-forming toxins. SM is also an important constituent of the eye lens membrane, and is believed to participate in the regulation of various nuclear functions. SM is an independent risk factor in the development of cardiovascular disease, and new studies have shed light on possible mechanism behind its role in atherogenesis.
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