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Kaplan A, Zelicha H, Tsaban G, Yaskolka Meir A, Rinott E, Kovsan J, Novack L, Thiery J, Ceglarek U, Burkhardt R, Willenberg A, Tirosh A, Cabantchik I, Stampfer MJ, Shai I. Protein bioavailability of Wolffia globosa duckweed, a novel aquatic plant - A randomized controlled trial. Clin Nutr 2018; 38:2576-2582. [PMID: 30591380 DOI: 10.1016/j.clnu.2018.12.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [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: 06/07/2018] [Revised: 11/22/2018] [Accepted: 12/05/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND & AIMS While the world is extensively looking for alternatives to animal protein sources, it is not clear which plant sources can provide the requisite full complement of essential amino acids (EAAs). Wolffia globosa is an aquatic, edible duckweed, the smallest plant on earth, and it offers all nine EAAs, dietary fibers, polyphenols, iron, zinc and B12 vitamin. This work was designed to evaluate Mankai (a newly developed high-protein strain of W. globosa) as an optional bioavailable source of EAAs for humans (primary outcome), and of further nutrients such as vitamin B12, in comparison to well-established animal and plant protein sources; cheese and peas, respectively. METHODS 36 men, subjected for 3 days to a stable diet and subsequent overnight (12 h) fast, were randomized to consume one of three iso-protein (30 g) based test-meals (soft cheese, green peas, Mankai). Blood samples were collected at 0, 30, 90 and 180 min. RESULTS The 3 h blood concentrations of the EAAs: histidine, phenylalanine, threonine, lysine, and tryptophan, triggered by intake of Mankai, was essentially significant as compared to baseline (p < 0.05) and similar to that of soft cheese and pea changes (p > 0.05 between groups). Although branched-chain-amino-acids (leucine/isoleucine, valine) increased significantly by Mankai within 3 h (p < 0.05 vs. baseline), the change was relatively higher for cheese as compared to Mankai or peas (p < 0.05 between groups). The increase in vitamin B12 by Mankai was higher as compared to changes induced by either cheese (p=0.007) or peas (p=0.047, between groups). CONCLUSIONS Mankai may provide a high-quality substitute source for animal protein, and a potential bioavailable source of vitamin B12.
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Affiliation(s)
- Alon Kaplan
- Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Hila Zelicha
- Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Gal Tsaban
- Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | | | - Ehud Rinott
- Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Julia Kovsan
- Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Lena Novack
- Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | | | - Uta Ceglarek
- Department of Medicine, University of Leipzig, Germany
| | | | | | - Amir Tirosh
- Endocrinology and Diabetes Research Center at Sheba Medical Center, Israel; Harvard Medical School and Harvard T.H., Chan School of Public Health and Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, MA, USA
| | - Ioav Cabantchik
- Department of Biological Chemistry, Hebrew University of Jerusalem, Israel
| | - Meir J Stampfer
- Harvard Medical School and Harvard T.H., Chan School of Public Health and Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, MA, USA
| | - Iris Shai
- Ben-Gurion University of the Negev, Beer-Sheva, Israel.
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Serfaty D, Rein M, Schwarzfuchs D, Shelef I, Gepner Y, Bril N, Cohen N, Shemesh E, Sarusi B, Kovsan J, Kenigsbuch S, Chassidim Y, Golan R, Witkow S, Henkin Y, Stampfer MJ, Rudich A, Shai I. Abdominal fat sub-depots and energy expenditure: Magnetic resonance imaging study. Clin Nutr 2016; 36:804-811. [PMID: 27288327 DOI: 10.1016/j.clnu.2016.05.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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: 09/01/2015] [Revised: 05/04/2016] [Accepted: 05/11/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND & AIMS We aimed to assess the association between the distinct abdominal sub-depots and resting energy expenditure (REE). METHODS We performed magnetic resonance imaging (MRI) to quantify abdominal visceral-adipose-tissue (VAT), deep-subcutaneous-adipose-tissue (deep-SAT), and superficial-subcutaneous-adipose-tissue (superficial-SAT). We measured REE by indirect-calorimetry. Non-exercise activity thermogenesis (NEAT) [1-3 metabolic equivalents (METs)] and exercise thermogenesis (activities of 4+METS) were estimated based on 6-days of accelerometry to assess total physical activity energy expenditure (PAEE). RESULTS We studied 282 participants: 249 men [mean age = 47.4 years, body-mass-index (BMI) = 31 kg/m2, mean VAT proportion from total abdominal fat = 34.5%, mean superficial-SAT proportion from total abdominal fat = 24.3%] and 33 women (mean age = 51.2 years, BMI = 30.1 kg/m2, mean VAT proportion from total abdominal fat = 22.8%, mean superficial-SAT proportion from total abdominal fat = 37.8%). As expected, women had lower REE [by 32.4% (1488 ± 234 kcal/day vs. 1971 ± 257 kcal/day; p < 0.01)] and lower REE/kg [by 8% (19.6 ± 3 kcal/kg vs. 21.2 ± 2 kcal/kg; p < 0.01)] than men. Exercise and total PAEE were positively associated with REE/kg (p < 0.01 for both) and a positive correlation between NEAT and REE/kg was borderline (p = 0.056). Participants, in whom abdominal VAT was the dominant proportional depot, had higher REE (1964 ± 297 kcal/day vs. 1654 ± 352 kcal/day; p < 0.01) and higher REE∖kg (22.2 ± 2.3 kcal/kg/day vs. 19.6 ± 2.5 kcal/kg/day; p < 0.01) than participants in whom superficial-SAT was the largest proportional depot. In multivariate models, adjusted for age, gender and residual BMI, increased VAT proportion was independently associated with higher REE (β = 0.181; p = 0.05). Likewise, increased VAT proportion (β = 0.482; p < 0.01) remained independently associated with higher REE/kg. In this model younger age (β = -0.329; p < 0.01) was associated with higher REE/kg. CONCLUSIONS Abdominal fat distribution patterns are associated with varying levels of resting energy expenditure, potentially reflecting different metabolic rates of adipose sub-depots and providing an anatomic/anthropometric link to physiological obese sub-phenotypes.
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Affiliation(s)
- Dana Serfaty
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Michal Rein
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Dan Schwarzfuchs
- Nuclear Research Center Negev, P.O.B 9001, Dimona, 84190, Israel.
| | - Ilan Shelef
- Soroka University Medical Center, P.O.B 151, Beer-Sheva, 84101, Israel.
| | - Yftach Gepner
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Nitzan Bril
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Noa Cohen
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Elad Shemesh
- Soroka University Medical Center, P.O.B 151, Beer-Sheva, 84101, Israel.
| | - Benjamin Sarusi
- Nuclear Research Center Negev, P.O.B 9001, Dimona, 84190, Israel.
| | - Julia Kovsan
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Shira Kenigsbuch
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Yoash Chassidim
- Soroka University Medical Center, P.O.B 151, Beer-Sheva, 84101, Israel.
| | - Rachel Golan
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Shula Witkow
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Yaakov Henkin
- Soroka University Medical Center, P.O.B 151, Beer-Sheva, 84101, Israel.
| | - Meir J Stampfer
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard School of Public Health, 677 Huntington Avenue Boston, MA, 02115, USA.
| | - Assaf Rudich
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
| | - Iris Shai
- Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.
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Haim Y, Blüher M, Slutsky N, Goldstein N, Klöting N, Harman-Boehm I, Kirshtein B, Ginsberg D, Gericke M, Guiu Jurado E, Kovsan J, Tarnovscki T, Kachko L, Bashan N, Gepner Y, Shai I, Rudich A. Elevated autophagy gene expression in adipose tissue of obese humans: A potential non-cell-cycle-dependent function of E2F1. Autophagy 2015; 11:2074-2088. [PMID: 26391754 PMCID: PMC4824599 DOI: 10.1080/15548627.2015.1094597] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Autophagy genes' expression is upregulated in visceral fat in human obesity, associating with obesity-related cardio-metabolic risk. E2F1 (E2F transcription factor 1) was shown in cancer cells to transcriptionally regulate autophagy. We hypothesize that E2F1 regulates adipocyte autophagy in obesity, associating with endocrine/metabolic dysfunction, thereby, representing non-cell-cycle function of this transcription factor. E2F1 protein (N=69) and mRNA (N=437) were elevated in visceral fat of obese humans, correlating with increased expression of ATG5 (autophagy-related 5), MAP1LC3B/LC3B (microtubule-associated protein 1 light chain 3 β), but not with proliferation/cell-cycle markers. Elevated E2F1 mainly characterized the adipocyte fraction, whereas MKI67 (marker of proliferation Ki-67) was elevated in the stromal-vascular fraction of adipose tissue. In human visceral fat explants, chromatin-immunoprecipitation revealed body mass index (BMI)-correlated increase in E2F1 binding to the promoter of MAP1LC3B, but not to the classical cell cycle E2F1 target, CCND1 (cyclin D1). Clinically, omental fat E2F1 expression correlated with insulin resistance, circulating free-fatty-acids (FFA), and with decreased circulating ADIPOQ/adiponectin, associations attenuated by adjustment for autophagy genes. Overexpression of E2F1 in HEK293 cells enhanced promoter activity of several autophagy genes and autophagic flux, and sensitized to further activation of autophagy by TNF. Conversely, mouse embryonic fibroblast (MEF)-derived adipocytes from e2f1 knockout mice (e2f1−/−) exhibited lower autophagy gene expression and flux, were more insulin sensitive, and secreted more ADIPOQ. Furthermore, e2f1−/− MEF-derived adipocytes, and autophagy-deficient (by Atg7 siRNA) adipocytes were resistant to cytokines-induced decrease in ADIPOQ secretion. Jointly, upregulated E2F1 sensitizes adipose tissue autophagy to inflammatory stimuli, linking visceral obesity to adipose and systemic metabolic-endocrine dysfunction.
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Affiliation(s)
- Yulia Haim
- a Department of Clinical Biochemistry and Pharmacology ; Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Matthias Blüher
- b Department of Medicine ; University of Leipzig ; Leipzig , Germany
| | - Noa Slutsky
- a Department of Clinical Biochemistry and Pharmacology ; Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Nir Goldstein
- a Department of Clinical Biochemistry and Pharmacology ; Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Nora Klöting
- b Department of Medicine ; University of Leipzig ; Leipzig , Germany
| | - Ilana Harman-Boehm
- c Soroka Academic Medical Center and Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Boris Kirshtein
- c Soroka Academic Medical Center and Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Doron Ginsberg
- d The Mina and Everard Goodman Faculty of Life Science; Bar-Ilan University ; Ramat Gan , Israel
| | - Martin Gericke
- e Institute of Anatomy; University of Leipzig ; Leipzig , Germany
| | | | - Julia Kovsan
- a Department of Clinical Biochemistry and Pharmacology ; Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Tanya Tarnovscki
- a Department of Clinical Biochemistry and Pharmacology ; Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Leonid Kachko
- c Soroka Academic Medical Center and Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Nava Bashan
- a Department of Clinical Biochemistry and Pharmacology ; Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Yiftach Gepner
- f Department of Epidemiology ; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Iris Shai
- f Department of Epidemiology ; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
| | - Assaf Rudich
- a Department of Clinical Biochemistry and Pharmacology ; Faculty of Health Sciences; Ben-Gurion University of the Negev ; Beer-Sheva , Israel.,g National Institute of Biotechnology in the Negev; Ben-Gurion University of the Negev ; Beer-Sheva , Israel
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4
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Gepner Y, Golan R, Harman-Boehm I, Henkin Y, Schwarzfuchs D, Shelef I, Durst R, Kovsan J, Bolotin A, Leitersdorf E, Shpitzen S, Balag S, Shemesh E, Witkow S, Tangi-Rosental O, Chassidim Y, Liberty IF, Sarusi B, Ben-Avraham S, Helander A, Ceglarek U, Stumvoll M, Blüher M, Thiery J, Rudich A, Stampfer MJ, Shai I. Effects of Initiating Moderate Alcohol Intake on Cardiometabolic Risk in Adults With Type 2 Diabetes: A 2-Year Randomized, Controlled Trial. Ann Intern Med 2015; 163:569-79. [PMID: 26458258 DOI: 10.7326/m14-1650] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Recommendations for moderate alcohol consumption remain controversial, particularly in type 2 diabetes mellitus (T2DM). Long-term randomized, controlled trials (RCTs) are lacking. OBJECTIVE To assess cardiometabolic effects of initiating moderate alcohol intake in persons with T2DM and whether the type of wine matters. DESIGN 2-year RCT (CASCADE [CArdiovaSCulAr Diabetes & Ethanol] trial). (ClinicalTrials.gov: NCT00784433). SETTING Ben-Gurion University of the Negev-Soroka Medical Center and Nuclear Research Center Negev, Israel. PATIENTS Alcohol-abstaining adults with well-controlled T2DM. INTERVENTION Patients were randomly assigned to 150 mL of mineral water, white wine, or red wine with dinner for 2 years. Wines and mineral water were provided. All groups followed a Mediterranean diet without caloric restriction. MEASUREMENTS Primary outcomes were lipid and glycemic control profiles. Genetic measurements were done, and patients were followed for blood pressure, liver biomarkers, medication use, symptoms, and quality of life. RESULTS Of the 224 patients who were randomly assigned, 94% had follow-up data at 1 year and 87% at 2 years. In addition to the changes in the water group (Mediterranean diet only), red wine significantly increased high-density lipoprotein cholesterol (HDL-C) level by 0.05 mmol/L (2.0 mg/dL) (95% CI, 0.04 to 0.06 mmol/L [1.6 to 2.2 mg/dL]; P < 0.001) and apolipoprotein(a)1 level by 0.03 g/L (CI, 0.01 to 0.06 g/L; P = 0.05) and decreased the total cholesterol-HDL-C ratio by 0.27 (CI, -0.52 to -0.01; P = 0.039). Only slow ethanol metabolizers (alcohol dehydrogenase alleles [ADH1B*1] carriers) significantly benefited from the effect of both wines on glycemic control (fasting plasma glucose, homeostatic model assessment of insulin resistance, and hemoglobin A1c) compared with fast ethanol metabolizers (persons homozygous for ADH1B*2). Across the 3 groups, no material differences were identified in blood pressure, adiposity, liver function, drug therapy, symptoms, or quality of life, except that sleep quality improved in both wine groups compared with the water group (P = 0.040). Overall, compared with the changes in the water group, red wine further reduced the number of components of the metabolic syndrome by 0.34 (CI, -0.68 to -0.001; P = 0.049). LIMITATION Participants were not blinded to treatment allocation. CONCLUSION This long-term RCT suggests that initiating moderate wine intake, especially red wine, among well-controlled diabetics as part of a healthy diet is apparently safe and modestly decreases cardiometabolic risk. The genetic interactions suggest that ethanol plays an important role in glucose metabolism, and red wine's effects also involve nonalcoholic constituents. PRIMARY FUNDING SOURCE European Foundation for the Study of Diabetes.
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Affiliation(s)
- Yftach Gepner
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Rachel Golan
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Ilana Harman-Boehm
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Yaakov Henkin
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Dan Schwarzfuchs
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Ilan Shelef
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Ronen Durst
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Julia Kovsan
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Arkady Bolotin
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Eran Leitersdorf
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Shoshana Shpitzen
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Shai Balag
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Elad Shemesh
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Shula Witkow
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Osnat Tangi-Rosental
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Yoash Chassidim
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Idit F. Liberty
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Benjamin Sarusi
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Sivan Ben-Avraham
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Anders Helander
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Uta Ceglarek
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Michael Stumvoll
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Matthias Blüher
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Joachim Thiery
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Assaf Rudich
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Meir J. Stampfer
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
| | - Iris Shai
- From Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel; Nuclear Research Center Negev, Dimona, Israel; Hadassah Hebrew University Medical Center, Jerusalem, Israel; Karolinska Institute, Solna, Sweden; University of Leipzig, Leipzig, Germany; and Brigham and Women's Hospital and Harvard School of Public Health, Boston, Massachusetts
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5
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Tirosh A, Golan R, Harman-Boehm I, Henkin Y, Schwarzfuchs D, Rudich A, Kovsan J, Fiedler GM, Blüher M, Stumvoll M, Thiery J, Stampfer MJ, Shai I. Renal function following three distinct weight loss dietary strategies during 2 years of a randomized controlled trial. Diabetes Care 2013; 36:2225-32. [PMID: 23690533 PMCID: PMC3714527 DOI: 10.2337/dc12-1846] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE This study addressed the long-term effect of various diets, particularly low-carbohydrate high-protein, on renal function on participants with or without type 2 diabetes. RESEARCH DESIGN AND METHODS In the 2-year Dietary Intervention Randomized Controlled Trial (DIRECT), 318 participants (age, 51 years; 86% men; BMI, 31 kg/m(2); mean estimated glomerular filtration rate [eGFR], 70.5 mL/min/1.73 m(2); mean urine microalbumin-to-creatinine ratio, 12:12) with serum creatinine <176 μmol/L (eGFR ≥ 30 mL/min/1.73 m(2)) were randomized to low-fat, Mediterranean, or low-carbohydrate diets. The 2-year compliance was 85%, and the proportion of protein intake significantly increased to 22% of energy only in the low-carbohydrate diet (P < 0.05 vs. low-fat and Mediterranean). We examined changes in urinary microalbumin and eGFR, estimated by Modification of Diet in Renal Disease and Chronic Kidney Disease Epidemiology Collaboration formulas. RESULTS Significant (P < 0.05 within groups) improvements in eGFR were achieved in low-carbohydrate (+5.3% [95% CI 2.1-8.5]), Mediterranean (+5.2% [3.0-7.4]), and low-fat diets (+4.0% [0.9-7.1]) with similar magnitude (P > 0.05) across diet groups. The increased eGFR was at least as prominent in participants with (+6.7%) or without (+4.5%) type 2 diabetes or those with lower baseline renal function of eGFR <60 mL/min/1.73 m(2) (+7.1%) versus eGFR ≥ 60 mL/min/1.73 m(2) (+3.7%). In a multivariable model adjusted for age, sex, diet group, type 2 diabetes, use of ACE inhibitors, 2-year weight loss, and change in protein intake (confounders and univariate predictors), only a decrease in fasting insulin (β = -0.211; P = 0.004) and systolic blood pressure (β = -0.25; P < 0.001) were independently associated with increased eGFR. The urine microalbumin-to-creatinine ratio improved similarly across the diets, particularly among participants with baseline sex-adjusted microalbuminuria, with a mean change of -24.8 (P < 0.05). CONCLUSIONS A low-carbohydrate diet is as safe as Mediterranean or low-fat diets in preserving/improving renal function among moderately obese participants with or without type 2 diabetes, with baseline serum creatinine <176 μmol/L. Potential improvement is likely to be mediated by weight loss-induced improvements in insulin sensitivity and blood pressure.
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Affiliation(s)
- Amir Tirosh
- Brigham and Women’s Hospital, Harvard School of Public Health, Boston, Massachusetts, USA
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Nov O, Shapiro H, Ovadia H, Tarnovscki T, Dvir I, Shemesh E, Kovsan J, Shelef I, Carmi Y, Voronov E, Apte RN, Lewis E, Haim Y, Konrad D, Bashan N, Rudich A. Interleukin-1β regulates fat-liver crosstalk in obesity by auto-paracrine modulation of adipose tissue inflammation and expandability. PLoS One 2013; 8:e53626. [PMID: 23341960 PMCID: PMC3547030 DOI: 10.1371/journal.pone.0053626] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 11/30/2012] [Indexed: 01/14/2023] Open
Abstract
The inflammasome has been recently implicated in obesity-associated dys-metabolism. However, of its products, the specific role of IL-1β was clinically demonstrated to mediate only the pancreatic beta-cell demise, and in mice mainly the intra-hepatic manifestations of obesity. Yet, it remains largely unknown if IL-1β, a cytokine believed to mainly function locally, could regulate dysfunctional inter-organ crosstalk in obesity. Here we show that High-fat-fed (HFF) mice exhibited a preferential increase of IL-1β in portal compared to systemic blood. Moreover, portally-drained mesenteric fat transplantation from IL-1βKO donors resulted in lower pyruvate-glucose flux compared to mice receiving wild-type (WT) transplant. These results raised a putative endocrine function for visceral fat-derived IL-1β in regulating hepatic gluconeogenic flux. IL-1βKO mice on HFF exhibited only a minor or no increase in adipose expression of pro-inflammatory genes (including macrophage M1 markers), Mac2-positive crown-like structures and CD11b-F4/80-double-positive macrophages, all of which were markedly increased in WT-HFF mice. Further consistent with autocrine/paracrine functions of IL-1β within adipose tissue, adipose tissue macrophage lipid content was increased in WT-HFF mice, but significantly less in IL-1βKO mice. Ex-vivo, adipose explants co-cultured with primary hepatocytes from WT or IL-1-receptor (IL-1RI)-KO mice suggested only a minor direct effect of adipose-derived IL-1β on hepatocyte insulin resistance. Importantly, although IL-1βKOs gained weight similarly to WT-HFF, they had larger fat depots with similar degree of adipocyte hypertrophy. Furthermore, adipogenesis genes and markers (pparg, cepba, fabp4, glut4) that were decreased by HFF in WT, were paradoxically elevated in IL-1βKO-HFF mice. These local alterations in adipose tissue inflammation and expansion correlated with a lower liver size, less hepatic steatosis, and preserved insulin sensitivity. Collectively, we demonstrate that by promoting adipose inflammation and limiting fat tissue expandability, IL-1β supports ectopic fat accumulation in hepatocytes and adipose-tissue macrophages, contributing to impaired fat-liver crosstalk in nutritional obesity.
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Affiliation(s)
- Ori Nov
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Hagit Shapiro
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Hilla Ovadia
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Tanya Tarnovscki
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Irit Dvir
- Chemistry and Life Sciences Program, Department of Industrial Management, Sapir Academic College, Hof Ashkelon, Israel
| | - Elad Shemesh
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- The Goldman Medical School, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Julia Kovsan
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ilan Shelef
- The Goldman Medical School, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Department of Radiology, Soroka Academic Medical Center, Beer-Sheva, Israel
| | - Yaron Carmi
- Department of Microbiology and Immunology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Elena Voronov
- Department of Microbiology and Immunology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ron N. Apte
- Department of Microbiology and Immunology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Eli Lewis
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Yulia Haim
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Daniel Konrad
- Division of Pediatric Endocrinology and Diabetology and Children Research’s Centre, University Children's Hospital and Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Nava Bashan
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Assaf Rudich
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- * E-mail:
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Maixner N, Kovsan J, Harman-Boehm I, Blüher M, Bashan N, Rudich A. Autophagy in adipose tissue. Obes Facts 2012; 5:710-21. [PMID: 23108431 DOI: 10.1159/000343983] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Accepted: 09/05/2012] [Indexed: 01/06/2023] Open
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Ovadia H, Haim Y, Nov O, Almog O, Kovsan J, Bashan N, Benhar M, Rudich A. Increased adipocyte S-nitrosylation targets anti-lipolytic action of insulin: relevance to adipose tissue dysfunction in obesity. J Biol Chem 2011; 286:30433-30443. [PMID: 21724851 DOI: 10.1074/jbc.m111.235945] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Protein S-nitrosylation is a reversible protein modification implicated in both physiological and pathophysiological regulation of protein function. In obesity, skeletal muscle insulin resistance is associated with increased S-nitrosylation of insulin-signaling proteins. However, whether adipose tissue is similarly affected in obesity and, if so, what are the causes and functional consequences of increased S-nitrosylation in this tissue are unknown. Total protein S-nitrosylation was increased in intra-abdominal adipose tissue of obese humans and in high fat-fed or leptin-deficient ob/ob mice. Both the insulin receptor β-subunit and Akt were S-nitrosylated, correlating with body weight. Elevated protein and mRNA expression of inducible NO synthase and decreased protein levels of thioredoxin reductase were associated with increased adipose tissue S-nitrosylation. Cultured differentiated pre-adipocyte cell lines exposed to the NO donors S-nitrosoglutathione (GSNO) or S-nitroso-N-acetylpenicillamine exhibited diminished insulin-stimulated phosphorylation of Akt but not of GSK3 nor of insulin-stimulated glucose uptake. Yet the anti-lipolytic action of insulin was markedly impaired in both cultured adipocytes and in mice injected with GSNO prior to administration of insulin. In cells, impaired ability of insulin to diminish phosphorylated PKA substrates in response to isoproterenol suggested impaired insulin-induced activation of PDE3B. Consistently, increased S-nitrosylation of PDE3B was detected in adipose tissue of high fat-fed obese mice. Site-directed mutagenesis revealed that Cys-768 and Cys-1040, two putative sites for S-nitrosylation adjacent to the substrate-binding site of PDE3B, accounted for ∼50% of its GSNO-induced S-nitrosylation. Collectively, PDE3B and the anti-lipolytic action of insulin may constitute novel targets for increased S-nitrosylation of adipose tissue in obesity.
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Affiliation(s)
- Hilla Ovadia
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84103
| | - Yulia Haim
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84103
| | - Ori Nov
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84103
| | - Orna Almog
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84103
| | - Julia Kovsan
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84103
| | - Nava Bashan
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84103
| | - Moran Benhar
- Department of Biochemistry, Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa 31096
| | - Assaf Rudich
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84103; National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 84103, Israel.
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9
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Kovsan J, Blüher M, Tarnovscki T, Klöting N, Kirshtein B, Madar L, Shai I, Golan R, Harman-Boehm I, Schön MR, Greenberg AS, Elazar Z, Bashan N, Rudich A. Altered autophagy in human adipose tissues in obesity. J Clin Endocrinol Metab 2011; 96:E268-77. [PMID: 21047928 DOI: 10.1210/jc.2010-1681] [Citation(s) in RCA: 250] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
CONTEXT Autophagy is a housekeeping mechanism, involved in metabolic regulation and stress response, shown recently to regulate lipid droplets biogenesis/breakdown and adipose tissue phenotype. OBJECTIVE We hypothesized that in human obesity autophagy may be altered in adipose tissue in a fat depot and distribution-dependent manner. SETTING AND PATIENTS Paired omental (Om) and subcutaneous (Sc) adipose tissue samples were used from obese and nonobese (n = 65, cohort 1); lean, Sc-obese and intraabdominally obese (n = 196, cohort 2); severely obese persons without diabetes or obesity-associated morbidity, matched for being insulin sensitive or resistant (n = 60, cohort 3). RESULTS Protein and mRNA levels of the autophagy genes Atg5, LC3A, and LC3B were increased in Om compared with Sc, more pronounced among obese persons, particularly with intraabdominal fat accumulation. Both adipocytes and stromal-vascular cells contribute to the expression of autophagy genes. An increased number of autophagosomes and elevated autophagic flux assessed in fat explants incubated with lysosomal inhibitors were observed in obesity, particularly in Om. The degree of visceral adiposity and adipocyte hypertrophy accounted for approximately 50% of the variance in omental Atg5 mRNA levels by multivariate regression analysis, whereas age, sex, measures of insulin sensitivity, inflammation, and adipose tissue stress were excluded from the model. Moreover, in cohort 3, the autophagy marker genes were increased in those who were insulin resistant compared with insulin sensitive, particularly in Om. CONCLUSIONS Autophagy is up-regulated in adipose tissue of obese persons, especially in Om, correlating with the degree of obesity, visceral fat distribution, and adipocyte hypertrophy. This may co-occur with insulin resistance but precede the occurrence of obesity-associated morbidity.
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Affiliation(s)
- Julia Kovsan
- Department of Clinical Biochemistry, National Institute of Biotechnology Negev, Ben-Gurion University of the Negev, Beer-Sheva, 84103, Israel
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10
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Kovsan J, Blüher M, Tarnovscki T, Klöting N, Kirshtein B, Madar L, Shai I, Golan R, Harman-Boehm I, Schön MR, Greenberg AS, Elazar Z, Bashan N, Rudich A. Altered Autophagy in Human Adipose Tissues in Obesity. Mol Endocrinol 2010. [DOI: 10.1210/mend.24.12.9998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Abstract
Context: Autophagy is a housekeeping mechanism, involved in metabolic regulation and stress response, shown recently to regulate lipid droplets biogenesis/breakdown and adipose tissue phenotype.
Objective: We hypothesized that in human obesity autophagy may be altered in adipose tissue in a fat depot and distribution-dependent manner.
Setting and Patients: Paired omental (Om) and sc adipose tissue samples were used from obese and nonobese (n = 65, cohort 1); lean, sc-obese and intraabdominally obese (n = 196, cohort 2); severely obese persons without diabetes or obesity-associated morbidity, matched for being insulin sensitive or resistant (n = 60, cohort 3).
Results: Protein and mRNA levels of the autophagy genes Atg5, LC3A, and LC3B were increased in Om compared with sc, more pronounced among obese persons, particularly if with intraabdominal fat accumulation. Both adipocytes and stromal-vascular cells contribute to the expression of autophagy genes. The increased number of autophagosomes and elevated autophagic flux assessed in fat explants incubated with lysosomal inhibitors were observed in obesity, particularly in Om. The degree of visceral adiposity and adipocyte hypertrophy accounted for approximately 50% of the variance in Atg5 mRNA levels by multivariate regression analysis, whereas age, sex, measures of insulin sensitivity, inflammation, and adipose tissue stress were excluded from the model. Moreover, in cohort 3, the autophagy marker genes were increased in those who were insulin resistant compared with insulin sensitive, particularly in Om.
Conclusions: Autophagy is up-regulated in adipose tissue of obese persons, especially in Om, correlating with the degree of obesity, visceral fat distribution, and adipocyte hypertrophy. This may precede the occurrence of obesity-associated morbidity.
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Abstract
Autophagy is a major degradative pathway(s) by which intracellular components are delivered into the lysosomes. It is largely implicated in determining cell death and survival because it eliminates unnecessary, damaged, and/or potentially harmful cellular products and organelles and is an important source for nutrients and energy production under conditions of external nutrient deficiency. As such, autophagy has been suggested to contribute to the regulation of carbohydrate and protein metabolism during fasting. Recently, three papers implicated a role for autophagy in cellular lipid metabolism as well. This Perspectives article presents these novel findings in the context of prior studies on the role of autophagy and lysosomes in metabolic and energy regulation, discusses their points of agreement and opposing propositions, and outlines key outstanding questions.
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Affiliation(s)
- Julia Kovsan
- Dept. of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84103, Israel
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12
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Bashan N, Kovsan J, Kachko I, Ovadia H, Rudich A. Positive and negative regulation of insulin signaling by reactive oxygen and nitrogen species. Physiol Rev 2009; 89:27-71. [PMID: 19126754 DOI: 10.1152/physrev.00014.2008] [Citation(s) in RCA: 351] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Regulated production of reactive oxygen species (ROS)/reactive nitrogen species (RNS) adequately balanced by antioxidant systems is a prerequisite for the participation of these active substances in physiological processes, including insulin action. Yet, increasing evidence implicates ROS and RNS as negative regulators of insulin signaling, rendering them putative mediators in the development of insulin resistance, a common endocrine abnormality that accompanies obesity and is a risk factor of type 2 diabetes. This review deals with this dual, seemingly contradictory, function of ROS and RNS in regulating insulin action: the major processes for ROS and RNS generation and detoxification are presented, and a critical review of the evidence that they participate in the positive and negative regulation of insulin action is provided. The cellular and molecular mechanisms by which ROS and RNS are thought to participate in normal insulin action and in the induction of insulin resistance are then described. Finally, we explore the potential usefulness and the challenges in modulating the oxidant-antioxidant balance as a potentially promising, but currently disappointing, means of improving insulin action in insulin resistance-associated conditions, leading causes of human morbidity and mortality of our era.
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Affiliation(s)
- Nava Bashan
- Department of Clinical Biochemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
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13
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Kovsan J, Osnis A, Maissel A, Mazor L, Tarnovscki T, Hollander L, Ovadia S, Meier B, Klein J, Bashan N, Rudich A. Depot-specific adipocyte cell lines reveal differential drug-induced responses of white adipocytes--relevance for partial lipodystrophy. Am J Physiol Endocrinol Metab 2009; 296:E315-22. [PMID: 19033543 DOI: 10.1152/ajpendo.90486.2008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Intra-abdominal (IA) fat functionally differs from subcutaneous (SC) adipose tissue, likely contributing to its stronger association with obesity-induced morbidity and to differential response to medications. Drug-induced partial lipodystrophy, like in response to antiretroviral agents, is an extreme manifestation of the different response of different fat depots, with loss of SC but not IA. Investigating depot-specific adipocyte differences is limited by the low accessibility to IA fat and by the heterogenous cell population comprising adipose tissue. Here, we aimed at utilizing immortalized preadipocyte cell lines from IA (epididymal) or SC (inguinal) fat to investigate whether they differentially respond to the HIV protease inhibitor nelfinavir. Preadipocytes were readily amenable to adipogenesis, as evidenced by lipid accumulation, expression of adipose-specific genes, measurable lipolysis, and insulin responsiveness. Leptin secretion was higher by the SC line, consistent with known differences between IA and SC fat. As previously reported, nelfinavir inhibited adipogenesis downstream of C/EBPbeta, but similarly in both cell lines. In contrast, nelfinavir's capacity to diminish insulin signaling, decrease leptin secretion, enhance basal lipolysis, and decrease expression of the lipid droplet-associated protein perilipin occurred more robustly and/or at lower nelfinavir concentrations in the SC line. This was despite similar intracellular concentrations of nelfinavir (23.8 +/- 5.6 and 33.6 +/- 12.2 microg/mg protein for inguinal and epididymal adipocytes, respectively, P = 0.46). The cell lines recapitulated depot-differential effects of nelfinavir observed in differentiated primary preadipocytes and with whole tissue explants. Thus, we report the use of fat depot-specific adipocyte cell lines for unraveling depot-differential responses to a drug causing partial lipodystrophy.
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Affiliation(s)
- Julia Kovsan
- Dept. of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 84103, Israel
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14
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Kovsan J, Ben-Romano R, Souza SC, Greenberg AS, Rudich A. Regulation of adipocyte lipolysis by degradation of the perilipin protein: nelfinavir enhances lysosome-mediated perilipin proteolysis. J Biol Chem 2007; 282:21704-11. [PMID: 17488708 DOI: 10.1074/jbc.m702223200] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A decrease in the lipid droplet-associated protein perilipin may constitute a mechanism for enhanced adipocyte lipolysis under nonstimulated (basal) conditions, and increased basal lipolysis has been linked to whole body metabolic dysregulation. Here we investigated whether the lipolytic actions of the human immunodeficiency virus protease inhibitor, nelfinavir, are mediated by decreased perilipin protein content and studied the mechanisms by which it occurs. Time course analysis revealed that the decrease in perilipin protein content preceded the increase in lipolysis. A causative relationship was suggested by demonstrating that nelfinavir potently increased lipolysis in adipocytes derived from mouse embryonal fibroblasts expressing perilipin but not in mouse embryonal fibroblast adipocytes devoid of perilipin and that adenoviral mediated overexpression of perilipin in 3T3-L1 adipocytes blocked the lipolytic actions of nelfinavir. Nelfinavir did not alter mRNA content of perilipin but rather decreased perilipin proteins t((1/2)) from >70 to 12 h. Protein degradation of perilipin in both control and nelfinavir-treated adipocytes could be prevented by inhibiting lysosomal proteolysis using leupeptin or NH(4)Cl but not by the proteasome inhibitor MG-132. We propose that proteolysis of perilipin involving the lysosomal protein degradation machinery may constitute a novel mechanism for enhancing adipocyte lipolysis.
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Affiliation(s)
- Julia Kovsan
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
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Miyoshi H, Souza SC, Zhang HH, Strissel KJ, Christoffolete MA, Kovsan J, Rudich A, Kraemer FB, Bianco AC, Obin MS, Greenberg AS. Perilipin promotes hormone-sensitive lipase-mediated adipocyte lipolysis via phosphorylation-dependent and -independent mechanisms. J Biol Chem 2006; 281:15837-44. [PMID: 16595669 DOI: 10.1074/jbc.m601097200] [Citation(s) in RCA: 231] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Hormone-sensitive lipase (HSL) is the predominant lipase effector of catecholamine-stimulated lipolysis in adipocytes. HSL-dependent lipolysis in response to catecholamines is mediated by protein kinase A (PKA)-dependent phosphorylation of perilipin A (Peri A), an essential lipid droplet (LD)-associated protein. It is believed that perilipin phosphorylation is essential for the translocation of HSL from the cytosol to the LD, a key event in stimulated lipolysis. Using adipocytes retrovirally engineered from murine embryonic fibroblasts of perilipin null mice (Peri-/- MEF), we demonstrate by cell fractionation and confocal microscopy that up to 50% of cellular HSL is LD-associated in the basal state and that PKA-stimulated HSL translocation is fully supported by adenoviral expression of a mutant perilipin lacking all six PKA sites (Peri Adelta1-6). PKA-stimulated HSL translocation was confirmed in differentiated brown adipocytes from perilipin null mice expressing an adipose-specific Peri Adelta1-6 transgene. Thus, PKA-induced HSL translocation was independent of perilipin phosphorylation. However, Peri Adelta1-6 failed to enhance PKA-stimulated lipolysis in either MEF adipocytes or differentiated brown adipocytes. Thus, the lipolytic action(s) of HSL at the LD surface requires PKA-dependent perilipin phosphorylation. In Peri-/- MEF adipocytes, PKA activation significantly enhanced the amount of HSL that could be cross-linked to and co-immunoprecipitated with ectopic Peri A. Notably, this enhanced cross-linking was blunted in Peri-/- MEF adipocytes expressing Peri Adelta1-6. This suggests that PKA-dependent perilipin phosphorylation facilitates (either direct or indirect) perilipin interaction with LD-associated HSL. These results redefine and expand our understanding of how perilipin regulates HSL-mediated lipolysis in adipocytes.
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Affiliation(s)
- Hideaki Miyoshi
- Jean Mayer United States Department of Agriculture Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts 02111, USA
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16
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Pessler-Cohen D, Pekala PH, Kovsan J, Bloch-Damti A, Rudich A, Bashan N. GLUT4 repression in response to oxidative stress is associated with reciprocal alterations in C/EBP alpha and delta isoforms in 3T3-L1 adipocytes. Arch Physiol Biochem 2006; 112:3-12. [PMID: 16754198 DOI: 10.1080/13813450500500399] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Insulin responsiveness of adipocytes is acquired during normal adipogenesis, and is essential for maintaining whole-body insulin sensitivity. Differentiated adipocytes exposed to oxidative stress become insulin resistant, exhibiting decreased expression of genes like the insulin-responsive glucose transporter GLUT4. Here we assessed the effect of oxidative stress on DNA binding capacity of C/EBP isoforms known to participate in adipocyte differentiation, and determine the relevance for GLUT4 gene regulation. By electrophoretic mobility shift assay, nuclear proteins from oxidized adipocytes exhibited decreased binding of C/EBPalpha-containing dimers to a DNA oligonucleotide harboring the C/EBP binding sequence from the murine GLUT4 promoter. C/EBPdelta-containing dimers were increased, while C/EBPbeta-dimers were unchanged. These alterations were mirrored by a 50% decrease and a 2-fold increase in the protein content of C/EBPalpha and C/EBPdelta, respectively. In oxidized cells, GLUT4 protein and mRNA levels were decreased, and a GLUT4 promoter segment containing the C/EBP binding site partially mediated oxidative stress-induced repression of a reported gene. The antioxidant lipoic acid protected against oxidation-induced decrease in GLUT4 and C/EBPalpha mRNA, but did not prevent the increase in C/EBPdelta mRNA. We propose that oxidative stress induces adipocyte insulin resistance partially by affecting the expression of C/EBPalpha and delta, resulting in altered C/EBP-dimer composition potentially occupying the GLUT4 promoter.
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Affiliation(s)
- Dorit Pessler-Cohen
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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