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Schiffmann A, Ahlswede L, Gimpl G. Reversible translocation of acyl-CoA:cholesterol acyltransferase (ACAT) between the endoplasmic reticulum and vesicular structures. Front Mol Biosci 2023; 10:1258799. [PMID: 38028547 PMCID: PMC10667705 DOI: 10.3389/fmolb.2023.1258799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 10/24/2023] [Indexed: 12/01/2023] Open
Abstract
The enzyme acyl-CoA:cholesterol acyltransferase (ACAT) is normally localized in the endoplasmic reticulum (ER) where it can esterify cholesterol for storage in lipid droplets and/or the formation of lipoproteins. Here, we report that ACAT can translocate from the ER into vesicular structures in response to different ACAT inhibitors. The translocation was fast (within minutes), reversible and occurred in different cell types. Interestingly, oleic acid was able to fasten the re-translocation from vesicles back into the reticular ER network. The process of ACAT translocation could also be induced by cyclodextrins, cholesterol, lanosterol (but not 4-cholestene-3 one), 25-hydroxycholesterol, and by certain stress stimuli such as hyperosmolarity (sucrose treatment), temperature change, or high-density cultivation. In vitro esterification showed that ACAT remains fully active after it has been translocated to vesicles in response to hyperosmotic sucrose treatment of the cells. The translocation process was not accompanied by changes in the electrophoretic mobility of ACAT, even after chemical crosslinking. Interestingly, the protein synthesis inhibitor cycloheximide showed a stimulating effect on ACAT activity and prevented the translocation of ACAT from the ER into vesicles.
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Affiliation(s)
| | | | - Gerald Gimpl
- Department of Chemistry and Biochemistry, Biocenter II, Johannes Gutenberg University Mainz, Mainz, Germany
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Rivet V, Maria A, Rivière S, Radjiv G, Suzon B, Henneton P, Rullier P, Konaté A, Schiffmann A, Sultan A, Le Quellec A, Guilpain P. Description de l’état nutritionnel chez 120 patients atteints de sclérodermie systémique suivis au CHRU de Montpellier. Rev Med Interne 2019. [DOI: 10.1016/j.revmed.2019.03.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Suzon B, Rivière S, Rivet V, Goulabchand R, Altwegg R, Schiffmann A, Flori N, Senesse P, Le Quellec A, Guilpain P, Maria A. Nutrition parentérale dans la sclérodermie systémique : à propos de 6 patients atteints de pseudo occlusion intestinale suivis au CHU de Montpellier. Rev Med Interne 2019. [DOI: 10.1016/j.revmed.2019.03.066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
The oxytocin receptor, a class A G protein coupled receptor (GPCR), is essentially involved in the physiology of reproduction. Two parameters are crucially important to support high-affinity agonist binding of the receptor: Mg2+ and cholesterol, both acting as positive modulators. Using displacement assays with a high-affinity fluorescent antagonist (OTAN-A647), we now show that sodium functions as a negative allosteric modulator of the oxytocin receptor. In membranes from HEK293 cells stably expressing the oxytocin receptor, oxytocin binding occurred with about 15-fold lower affinity when sodium chloride was increased from 0 to 300 mM, whereas antagonist binding remained largely unchanged. The effect was concentration-dependent, sodium-specific, and it was also observed for oxytocin receptors endogenously expressed in Hs578T breast cancer cells. A conserved Asp (Asp 85) is known to stabilize the sodium binding site in other GCPRs. Mutations of this residue into Ala or Asn are known to yield non-functional oxytocin receptors. When Asp 85 was exchanged for Glu, most of the oxytocin receptors were localized in intracellular structures, but a faint plasma membrane labeling with OTAN-A647 and the appearance of oxytocin-induced calcium responses indicated that these receptors were functional. However, a sodium effect was not detectable for the mutant D85E oxytocin receptors. Thus, the oxytocin receptor is allosterically controlled by sodium similar to other GPCRs, but it behaves differently concerning the involvement of the conserved Asp 85. In case of the oxytocin receptor, Asp 85 is obviously essential for proper localization in the plasma membrane.
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Affiliation(s)
- Andrea Schiffmann
- Johannes-Gutenberg University Mainz, Institute of Biochemistry, Johann-Joachim Becherweg 30, 55128 Mainz, Germany
| | - Gerald Gimpl
- Johannes-Gutenberg University Mainz, Institute of Biochemistry, Johann-Joachim Becherweg 30, 55128 Mainz, Germany.
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Fraison JB, Rivière S, Konate AP, Mura F, Schneider C, Cerutti D, Schiffmann A, Guilpain P, Jorgensen C, Le Quellec A. Manifestations psychiatriques au cours de la maladie de Behçet : étude rétrospective monocentrique de 98 patients. Rev Med Interne 2014. [DOI: 10.1016/j.revmed.2014.03.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Maria A, Guilpain P, Rivière S, Cerutti D, Guilhem A, Schiffmann A, Jorgensen C, Touitou I, Le Quellec A. Utilisation des biothérapies ciblant les cytokines inflammatoires (TNF-α, IL-1, IL-6) dans la maladie de Still de l’adulte réfractaire. Rev Med Interne 2014. [DOI: 10.1016/j.revmed.2014.03.080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Cerutti D, Guilpain P, Schiffmann A, Rivière S, Carra C, Labauge P, Le Quellec A. [Serious clinical manifestations of vitamin deficiency after a "sleeve" gastrectomy: role of psychogenic anorexia]. Rev Med Interne 2013; 35:609-12. [PMID: 24321087 DOI: 10.1016/j.revmed.2013.11.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [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: 07/23/2013] [Revised: 10/05/2013] [Accepted: 11/01/2013] [Indexed: 01/07/2023]
Abstract
INTRODUCTION Morbid obesity is an emerging condition in the general population. Bariatric surgery, which has demonstrated its effectiveness for weight loss, mortality and morbidity related to obesity, is required in some patients. However, it may be associated with various adverse effects, including vitamin deficiencies. CASE REPORT We report a 33-year old man who presented central and peripheral neurological deficits and cardiac manifestations related to multiple vitamin deficiencies, following "sleeve" gastrectomy. The vitamin deficiencies were related to insufficient ingesta secondary to psychogenic anorexia. The patient improved with vitamins, antidepressant drugs and atypical neuroleptics. CONCLUSION Post-operative complications of "sleeve" gastrectomy include vitamin deficiencies that can develop in the context of psychogenic anorexia and ingesta reduction, in the absence of any digestive malabsorption.
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Affiliation(s)
- D Cerutti
- Département de médecine interne, équipe « médecine interne, maladies multi-organiques de l'adulte », université Montpellier 1, hôpital Saint-Éloi, CHRU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France
| | - P Guilpain
- Département de médecine interne, équipe « médecine interne, maladies multi-organiques de l'adulte », université Montpellier 1, hôpital Saint-Éloi, CHRU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France.
| | - A Schiffmann
- Département de médecine interne, équipe « médecine interne, maladies multi-organiques de l'adulte », université Montpellier 1, hôpital Saint-Éloi, CHRU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France
| | - S Rivière
- Département de médecine interne, équipe « médecine interne, maladies multi-organiques de l'adulte », université Montpellier 1, hôpital Saint-Éloi, CHRU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France
| | - C Carra
- Département de neurologie, université Montpellier 1, hôpital Gui-De-Chauliac, CHRU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France
| | - P Labauge
- Département de neurologie, université Montpellier 1, hôpital Gui-De-Chauliac, CHRU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France
| | - A Le Quellec
- Département de médecine interne, équipe « médecine interne, maladies multi-organiques de l'adulte », université Montpellier 1, hôpital Saint-Éloi, CHRU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France
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Fraison JB, Cerutti D, Schiffmann A, Forestier A, Guilpain P, Le Quellec A. Polynucléose para-néoplasique mimant un syndrome myéloprolifératif : à propos d’un cas compliqué d’hémorragie intra-alvéolaire. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Dufour S, Riviere S, Schiffmann A, Forestier A, Guilpain P, Le Quellec A. Syndrome d’hyperimmunoglobulinémie D et anakinra : à propos de 2 cas. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.10.239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Veysseyre F, Schiffmann A, Riviere S, Forestier A, Ramos J, Guilpain P, Le Quellec A. Hypertension portale sans cirrhose au cours d’une vascularite des petits vaisseaux : penser à l’hyperplasie nodulaire régénérative. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.10.185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Flach K, Hilbrich I, Schiffmann A, Gärtner U, Krüger M, Leonhardt M, Waschipky H, Wick L, Arendt T, Holzer M. Tau oligomers impair artificial membrane integrity and cellular viability. J Biol Chem 2012; 287:43223-33. [PMID: 23129775 DOI: 10.1074/jbc.m112.396176] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The microtubule-associated protein Tau is mainly expressed in neurons, where it binds and stabilizes microtubules. In Alzheimer disease and other tauopathies, Tau protein has a reduced affinity toward microtubules. As a consequence, Tau protein detaches from microtubules and eventually aggregates into β-sheet-containing filaments. The fibrillization of monomeric Tau to filaments is a multistep process that involves the formation of various aggregates, including spherical and protofibrillar oligomers. Previous concepts, primarily developed for Aβ and α-synuclein, propose these oligomeric intermediates as the primary cytotoxic species mediating their deleterious effects through membrane permeabilization. In the present study, we thus analyzed whether this concept can also be applied to Tau protein. To this end, viability and membrane integrity were assessed on SH-SY5Y neuroblastoma cells and artificial phospholipid vesicles, treated with Tau monomers, Tau aggregation intermediates, or Tau fibrils. Our findings suggest that oligomeric Tau aggregation intermediates are the most toxic compounds of Tau fibrillogenesis, which effectively decrease cell viability and increase phospholipid vesicle leakage. Our data integrate Tau protein into the class of amyloidogenic proteins and enforce the hypothesis of a common toxicity-mediating mechanism for amyloidogenic proteins.
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Affiliation(s)
- Katharina Flach
- Department of Molecular and Cellular Mechanisms of Neurodegeneration, Paul Flechsig Institute of Brain Research, Faculty of Medicine, Jahnallee 59, University of Leipzig, 04109 Leipzig, Germany
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Maria A, Guilpain P, Forestier A, Delhom E, Schiffmann A, Riviere S, Khau Van Kien A, Leray-Moragues H, Serre I, Vincent T, Eliaou J, Le Quellec A. Embolie pulmonaire asymptomatique dans le syndrome de Churg et Strauss. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.03.186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Maria A, Guilpain P, Forestier A, Schiffmann A, Riviere S, Oziol E, Frouin E, Le Quellec A. Syndrome de Sweet et sarcoïdose : une association inhabituelle. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.03.304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Diercke M, Kirchner M, Claussen K, Wienecke WR, Strotmann I, Frangenberg J, Schiffmann A, Bettge-Weller G, Arvand M, Uphoff H. Spätes Cluster von STEC O104:H4-Infektionen in Niedersachsen und Hessen verursacht durch kontaminierte Lebensmittel, Mai 2011. Gesundheitswesen 2012. [DOI: 10.1055/s-0032-1307352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Fraison JB, Guilpain P, Schiffmann A, Forestier A, Riviere S, Veyrac M, Lemoing V, Rispail P, Le Quellec A. Exposition aux fientes de poulets et crytococcose pulmonaire au cours de la maladie de Crohn traitée par anti-TNF. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Schiffmann A, Guilpain P, Ramos J, Forestier A, Riviere S, Le Quellec A. La pseudo-obstruction intestinale chronique : une manifestation rare mais sévère de dermatomyosite. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Schiffmann A, Fontaine C, Guilpain P, Morel J, Guillot B, Girard C, Riviere S, Le Quellec A. Lésions hépatiques induites par le méthotrexate : intérêt des méthodes non invasives de surveillance. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Fraison JB, Riviere S, Konate AP, Schiffmann A, Mura F, Le Quellec A. Uvéite intermédiaire corticorésistante : pensez à l’amylose. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.03.321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Schiffmann A, Pers YM, Lukas C, Combe B, Morel J. Mesenteric and splenic cat-scratch disease during etanercept therapy. Rheumatology (Oxford) 2009; 48:1461-2. [DOI: 10.1093/rheumatology/kep241] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Schiffmann A, Riviere S, de Matteis O, Le Quellec A. Pseudo-obstruction intestinale : manifestation lupique inhabituelle. Rev Med Interne 2008. [DOI: 10.1016/j.revmed.2008.03.294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Abstract
The authors analyzed 329 referrals for psychiatric consultation from medical and surgical wards. They found depression to be the most prevalent diagnosis (34%), with Major Depression being the most common DSM-III subtype (49%). Depression was predominant in the elderly (p less than 0.05), in women (p less than 0.05), and in patients with a high degree of psychosocial stressors (p less than 0.01). There were significant differences among the DSM-III subtypes of depression in some of these correlates. The authors emphasize the importance of DSM-III in differentiating among the subtypes of depression in referred patients but they suggest the need for a new diagnosis for depression in the physically ill.
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Schiffmann A, Bachar E, Benbassat J. [Factors affecting performance in Israel specialty board examinations]. Harefuah 1979; 96:154-6. [PMID: 488814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Selinger D, Cohen S, Schiffmann A. A new approach to teaching normal human growth and development. The role of clinical simulations as a teaching and evaluation device for preclinical medical students. Child Psychiatry Hum Dev 1978; 8:239-49. [PMID: 688806 DOI: 10.1007/bf01463555] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A new approach to teaching Normal Growth and Development to preclinical medical students is described. By using specially constructed multidisciplinary clinical simulations as training and evaluation devices, students were gradually and simultaneously exposed to: (1) subject matter; (2) the concept of multidisciplinary health care delivery; and (3) the objectives, strategies, and techniques of problem solving and diagnostic reasoning that characterize experienced physicians. The course, designed by a child psychiatrist and medical educators, was taught by a multidisciplinary teaching team drawn from faculty and health care representatives. Student evaluations of the course were favorable.
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Weidmann P, de Chatel R, Schiffmann A, Bachmann E, Beretta-Piccoli C, Reubi FC, Ziegler WH, Vetter W. Interrelations between age and plasma renin, aldosterone and cortisol, urinary catecholamines, and the body sodium/volume state in normal man. Klin Wochenschr 1977; 55:725-33. [PMID: 895008 DOI: 10.1007/bf01476959] [Citation(s) in RCA: 74] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Interrelations between age and plasma renin, aldosterone and cortisol levels, urinary catecholamiens, plasma and blood volumes, exchangeable body sodium and blood pressure wwere studied in 28 young (19 to 29 years), 16 middle-aged (32 to 58 years) and 15 elderly (60 to 74 years) healthy subjects. Supine and upright plasma renin and supine aldosterone levels decreased while urinary noradrenaline excretion rate increased progressively with aging (r= greater than 0.34; p less than 0.05), with significant differences in mean values between young and elderly subjects (p less than 0.02). There was also an age-related decrease in upright plasma aldosterone concentration, although this was no statistically significant. Furthermore, mean plasma cortisol concentrations increased in response to upright posture in elderly ( + 50%; p less than 0.02), but not in young ( --10%) or middle-aged ( --8%) subjects. Blood pressure correlated with age ( r =0.35; p less than 0.05) or noradrenaline excretion rate ( r= 0.34) in the entire study population and with blood volume in the elderly ( r = 0.68), but not in the young or middle-aged study. Groups. There were no significant age-related differences in the body sodium/volume state, basal plasma cortisol levels or urinary adrenaline excretion rate, and plasma renin or aldosterone levels did not correlate with these parameters or with blood pressure. It is concluded that the influence of age on plasma renin or aldosterone levels, plasma cortisol responsiveness to upright posture, and urinary noradrenaline excretion should be taken into consideration, whenever these factors have to be interpreted in patients with arterial hypertension or other clinical disorders. Further more, these data are conssitent with the possiblity that in normal man increases in supine blood pressure with aging may be related at least partly to concomitant changes in free peripheral noradrenaline.
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Schiffmann A, Borgmann V. [Appendicitis in childhood. Results in 1179 cases from 1972--1976]. Med Monatsschr 1977; 31:229-31. [PMID: 865405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Abstract
An approach to teaching the introduction of clinical medicine to medical students is described. It is based on (A) gradual exposure to patients and step-by-step introduction to the objectives and techniques of history taking, with emphasis on training for symptom identification; (B) early exposure to the problem-oriented approach; (C) early diagnostic hypothesis generation; and (D) self-directed learning. The objectives of the proposed approach are to teach students to communicate with patients, to teach the skills of history taking and physical examination, and to introduce the problem-solving strategies that characterize the diagnostic reasoning of experienced physicians.
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