1
|
Concept and application of circulating proteasomes. Exp Mol Med 2021; 53:1539-1546. [PMID: 34707192 PMCID: PMC8568939 DOI: 10.1038/s12276-021-00692-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 08/27/2021] [Accepted: 09/06/2021] [Indexed: 12/26/2022] Open
Abstract
Proteostasis is primarily a function of protein synthesis and degradation. Although the components and processes involved in intracellular proteostasis have been studied extensively, it is apparent that extracellular proteostasis is equitably crucial for the viability of organisms. The 26S proteasome, a unique ATP-dependent proteolytic complex in eukaryotic cells, contributes to the majority of intracellular proteolysis. Accumulating evidence suggests the presence of intact 20S proteasomes in the circulatory system (c-proteasomes), and similar to other plasma proteins, the levels of these c-proteasomes may vary, potentially reflecting specific pathophysiological conditions. Under normal conditions, the concentration of c-proteasomes has been reported to be in the range of ~0.2-2 μg/mL, which is ~2-4-fold lower than that of functional plasma proteins but markedly higher than that of signaling proteins. The characterization of c-proteasomes, such as their origin, structure, role, and clearance, has been delayed mainly due to technical limitations. In this review, we summarize the current perspectives pertaining to c-proteasomes, focusing on the methodology, including our experimental understanding. We believe that once the pathological relevance of c-proteasomes is revealed, these unique components may be utilized in the diagnosis and prognosis of diverse human diseases.
Collapse
|
2
|
Yun Y, Lee SY, Choi WH, Park JC, Lee DH, Kim YK, Lee JH, Lee JY, Lee MJ, Kim YH. Proteasome Activity in the Plasma as a Novel Biomarker in Mild Cognitive Impairment with Chronic Tinnitus. J Alzheimers Dis 2021; 78:195-205. [PMID: 32955464 PMCID: PMC7683073 DOI: 10.3233/jad-200728] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND Although the existence of proteasomes in human blood, termed circulating proteasomes (c-proteasomes), has been reported previously, their origin and pathophysiological functions remain largely unknown. OBJECTIVE Given that c-proteasome activity was significantly reduced in Alzheimer's disease model mice and relatively high frequency of mild cognitive impairment (MCI) is accompanied by chronic tinnitus in aged patients, we examined whether c-proteasome activity in human plasma was associated with cognitive function in patients with chronic tinnitus. METHODS c-Proteasome activity in the plasma of tinnitus patients (N = 55) was measured with fluorogenic reporter substrate, suc-LLVY-AMC. To assess MCI, the Montreal Cognitive Assessment was conducted with a cut-off score of 22/23. All patients underwent audiological and psychoacoustic analyses. Levels of c-proteasomes, Aβ42, and Aβ40 were measured using ELISA, and their association with c-proteasome activity was evaluated. RESULTS The activity of circulating proteasomes was significantly lower in patients with chronic tinnitus and MCI (p = 0.042), whereas activities of other plasma enzymes showed little correlation. In addition, c-proteasome activity was negatively associated with the level of plasma Aβ and was directly dependent on its own concentration in the plasma of patients with chronic tinnitus. CONCLUSION Our current work provides a new perspective for understanding the potential relationship between circulating proteasomes in the plasma and cognitive dysfunction, suggesting a novel, non-invasive biomarker in the context of MCI diagnosis.
Collapse
Affiliation(s)
- Yejin Yun
- Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, Korea
| | - Sang-Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul, Korea
| | - Won Hoon Choi
- Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, Korea
| | - Jong-Chan Park
- Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, Korea.,Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Dong Han Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Konkuk University Medical Center, Seoul, Korea
| | - Yun Kyung Kim
- Center for Neuro-Medicine, Brain Science Institute, Korea Institute of Science and Technology, Seoul, Korea
| | - Jung Hoon Lee
- Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, Korea.,Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Jun-Young Lee
- Department of Psychiatry and Neuroscience Research Institute, Seoul National University College of Medicine, Boramae Medical Center, Seoul, Korea
| | - Min Jae Lee
- Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, Korea.,Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Young Ho Kim
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Boramae Medical Center, Seoul, Korea
| |
Collapse
|
3
|
Dwivedi V, Yaniv K, Sharon M. Beyond cells: The extracellular circulating 20S proteasomes. Biochim Biophys Acta Mol Basis Dis 2020; 1867:166041. [PMID: 33338594 DOI: 10.1016/j.bbadis.2020.166041] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/30/2020] [Accepted: 12/04/2020] [Indexed: 01/08/2023]
Abstract
Accumulating evidence arising from numerous clinical studies indicate that assembled and functional 20S proteasome complexes circulate freely in plasma. Elevated levels of this core proteolytic complex have been found in the plasma of patients suffering from blood, skin and solid cancers, autoimmune disorders, trauma and sepsis. Moreover, in various diseases, there is a positive correlation between circulating 20S proteasome (c20S) levels and treatment efficacy and survival rates, suggesting the involvement of this under-studied c20S complex in pathophysiology. However, many aspects of this system remain enigmatic, as we still do not know the origin, biological role or mechanisms of extracellular transport and regulation of c20S proteasomes. In this review, we provide an overview of the current understanding of the c20S proteasome system and discuss the remaining gaps in knowledge.
Collapse
Affiliation(s)
- Vandita Dwivedi
- Departments of Biomolecular Sciences, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Karina Yaniv
- Departments of Biological Regulation, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Michal Sharon
- Departments of Biomolecular Sciences, Weizmann Institute of Science, Rehovot 7610001, Israel.
| |
Collapse
|
4
|
Martínez-Rojas F, Diculescu VC, Armijo F. Electrochemical Immunosensing Platform for the Determination of the 20S Proteasome Using an Aminophenylboronic/Poly-indole-6-carboxylic Acid-Modified Electrode. ACS APPLIED BIO MATERIALS 2020; 3:4941-4948. [PMID: 35021738 DOI: 10.1021/acsabm.0c00478] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The first electrochemical immunosensor for the determination of the 20S proteasome (P20S) was developed, entailing the immobilization of an antibody on an aminophenylboronic/poly-indole-6-carboxylic acid-modified electrode. The proposed electrochemical bioplatform is a simple and feasible analytical tool applicable for the determination of P20S in human plasma, considering its high clinical and biological relevance. Cyclic voltammetry, electrochemical impedance spectroscopy, and square wave voltammetry (SWV) were used to determine the optimal step-by-step process to obtain the electrochemical immunosensor. The interaction of P20S with the recognition layer of the immobilized antibody on the nanostructured surface took place by incubating the electrode in a P20S solution at 20 °C for 2 h. Using SWV as an electro-analytical technique, this immunosensor can quantify P20S. The current was linear with the P20S concentration within two dynamic concentration ranges from 20.0 to 80.0 and 80.0 to 200.0 ng·mL-1 (r2 = 0.992 and 0.98, respectively) with a limit of detection and quantification of 6 and 18 ng·mL-1, respectively. Moreover, the immunosensor showed considerable repeatability and reproducibility, when the determination was done in human serum, which confirms that it is a promising alternative for direct detection of P20S in biological fluids with minimal interference.
Collapse
Affiliation(s)
- Francisco Martínez-Rojas
- Facultad de Quimica y de Farmacia, Departamento de Química Inorgánica, Laboratorio de Bioelectroquimica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
| | - Victor C Diculescu
- National Institute of Materials Physics, Atomistilor, No. 405A, Măgurele, 077125 Ilfov, Romania
| | - Francisco Armijo
- Facultad de Quimica y de Farmacia, Departamento de Química Inorgánica, Laboratorio de Bioelectroquimica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
| |
Collapse
|
5
|
Aniort J, Freist M, Piraud A, Philipponnet C, Hadj Abdelkader M, Garrouste C, Gentes E, Pereira B, Heng AE. Circulating 20S proteasome for assessing protein energy wasting syndrome in hemodialysis patients. PLoS One 2020; 15:e0236948. [PMID: 32735636 PMCID: PMC7394422 DOI: 10.1371/journal.pone.0236948] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 07/16/2020] [Indexed: 12/02/2022] Open
Abstract
Protein energy wasting (PEW) including muscle atrophy is a common complication in chronic hemodialysis patients. The ubiquitin proteasome system (UPS) is the main proteolytic system causing muscle atrophy in chronic kidney disease and proteasome 20S is the catalytic component of the UPS. Circulating proteasome 20S (c20S proteasome) is present in the blood and its level is related to disease severity and prognosis in several disorders. We hypothesized that c20S proteasome could be related with muscle mass, other PEW criteria and their evolution in hemodialysis patients. Stable hemodialysis patients treated at our center for more than 3 months were followed over 2 years. C20S proteasome assay was performed at baseline. Biological and clinical data were collected, muscle mass was assessed by multi-frequency bio-impedancemetry, and nutritional scores were calculated at baseline, 1 year and 2 years. Hospitalizations and mortality data were collected over the 2 years. Forty-nine patients were included. At baseline, the c20S proteasome level was 0.40[0.26–0.55] μg/ml. Low muscle mass as defined by a lean tissue index (LTI) < 10th in accordance with the International Society of Renal Nutrition and Metabolism guidelines was observed in 36% and PEW in 62%. Increased c20S proteasome levels were related with LTI at baseline (R = 0.43, p = 0.004) and with its 2 year-variation (R = -0.56, p = 0.003). Two-year survival rate was not different between higher and lower c20S proteasome values (78.9 vs 78.4%, p = 0.98 log-rank test). C20S proteasome is not a good marker for assessing nutritional status in hemodialysis patients and predicting patient outcomes.
Collapse
Affiliation(s)
- Julien Aniort
- Nephrology, Dialysis and Transplantation Department, Gabriel Montpied University Hospital, Clermont-Ferrand, France
- INRA, UMR 1019, Human Nutrition Unit (UNH), St Genès Champanelle, France
- * E-mail:
| | - Marine Freist
- Nephrology, Dialysis and Transplantation Department, Gabriel Montpied University Hospital, Clermont-Ferrand, France
- Nephrology and Dialysis Department, Emile Roux Hospital, Le Puy en Velay, France
| | - Aurélien Piraud
- Nephrology, Dialysis and Transplantation Department, Gabriel Montpied University Hospital, Clermont-Ferrand, France
| | - Carole Philipponnet
- Nephrology, Dialysis and Transplantation Department, Gabriel Montpied University Hospital, Clermont-Ferrand, France
| | - Mohamed Hadj Abdelkader
- Nephrology, Dialysis and Transplantation Department, Gabriel Montpied University Hospital, Clermont-Ferrand, France
| | - Cyril Garrouste
- Nephrology, Dialysis and Transplantation Department, Gabriel Montpied University Hospital, Clermont-Ferrand, France
| | - Elodie Gentes
- Clinical Nutrition Department, Gabriel Montpied University Hospital, Clermont-Ferrand, France
| | - Bruno Pereira
- University Hospital of Clermont-Ferrand, Biostatistics unit (DRCI), Clermont-Ferrand, France
| | - Anne-Elisabeth Heng
- Nephrology, Dialysis and Transplantation Department, Gabriel Montpied University Hospital, Clermont-Ferrand, France
- INRA, UMR 1019, Human Nutrition Unit (UNH), St Genès Champanelle, France
| |
Collapse
|
6
|
Fukasawa H, Niwa H, Ishibuchi K, Kaneko M, Iwakura T, Yasuda H, Furuya R. The Impact of Serum Zinc Levels on Abdominal Fat Mass in Hemodialysis Patients. Nutrients 2020; 12:nu12030656. [PMID: 32121224 PMCID: PMC7146464 DOI: 10.3390/nu12030656] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 02/21/2020] [Accepted: 02/26/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Zinc deficiency is highly prevalent and is caused by inadequate dietary intake, malabsorption and removal by treatment in hemodialysis patients. This study investigated the relationship between serum zinc levels and nutritional status in hemodialysis patients. METHODS A cross-sectional study examining 87 hemodialysis patients was performed. The serum concentrations of zinc were studied to evaluate their association with nutritional status, which was assessed by measuring abdominal muscle and fat areas with computed tomography. RESULTS Serum zinc levels were significantly and positively correlated with subcutaneous and visceral fat areas (r = 0.299, p < 0.01, and r = 0.298, p < 0.01, respectively), but not abdominal muscle areas. Multiple regression analyses demonstrated that serum zinc levels were a significant independent predictor of visceral fat areas (p < 0.01), but not subcutaneous fat areas (p = 0.631). CONCLUSIONS Our findings suggest that serum zinc levels could play a crucial role in determining abdominal fat mass in hemodialysis patients.
Collapse
Affiliation(s)
- Hirotaka Fukasawa
- Renal Division, Department of Internal Medicine, Iwata City Hospital, Iwata, Shizuoka 438-8550, Japan
| | - Hiroki Niwa
- Renal Division, Department of Internal Medicine, Iwata City Hospital, Iwata, Shizuoka 438-8550, Japan
| | - Kento Ishibuchi
- Renal Division, Department of Internal Medicine, Iwata City Hospital, Iwata, Shizuoka 438-8550, Japan
| | - Mai Kaneko
- Renal Division, Department of Internal Medicine, Iwata City Hospital, Iwata, Shizuoka 438-8550, Japan
| | - Takamasa Iwakura
- Renal Division, Department of Internal Medicine, Iwata City Hospital, Iwata, Shizuoka 438-8550, Japan
| | - Hideo Yasuda
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 438-8550, Japan
| | - Ryuichi Furuya
- Renal Division, Department of Internal Medicine, Iwata City Hospital, Iwata, Shizuoka 438-8550, Japan
| |
Collapse
|
7
|
Berryman K, Buhimschi CS, Zhao G, Axe M, Locke M, Buhimschi IA. Proteasome Levels and Activity in Pregnancies Complicated by Severe Preeclampsia and Hemolysis, Elevated Liver Enzymes, and Thrombocytopenia (HELLP) Syndrome. Hypertension 2019; 73:1308-1318. [PMID: 31067191 DOI: 10.1161/hypertensionaha.118.12437] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Excessive accumulation of misfolded proteins was recently demonstrated in preeclampsia. We examined levels and activity of circulatory proteasome and immunoproteasome (inflammatory subtype) in preeclampsia and hemolysis, elevated liver enzymes, and thrombocytopenia (HELLP) syndrome. We analyzed samples from women with hypertensive pregnancy disorders (n=115), including preeclampsia with severe features (sPE) and HELLP syndrome, and normotensive controls (n=45). Plasma proteasome and immunoproteasome immunoreactivity were determined by quantifying the α-subunit of the 20S core and β5i (proteasome subunit beta 8 [PSMB8]), respectively. Plasma proteasome activity was analyzed with fluorogenic substrates. MG132, lactacystin, and ONX0914 were used to inhibit the circulating proteasome and immunoproteasome, respectively. Plasma cytokine profiles were evaluated by multiplex immunoassay. Placental expression of β5 (constitutive proteasome) and β5i (immunoproteasome) was interrogated by immunohistochemistry. Women with sPE had increased plasma 20S levels ( P<0.001) and elevated lytic activities (chymotrypsin-like 7-fold, caspase-like 4.2-fold, trypsin-like 2.2-fold; P <0.001 for all) compared with pregnant controls. Women with features of HELLP displayed the highest plasma proteasome levels and activity, which correlated with decreased IFN-γ (interferon-γ), and increased IL (interleukin)-8 and IL-10. In sPE and HELLP, chymotrypsin-like activity was suppressed by proteasome inhibitors including ONX0914. Compared with gestational age-matched controls, sPE placentas harbored increased β5 and β5i immunostaining in trophoblasts. β5i signal was elevated in HELLP with predominant staining in villous core, extravillous trophoblasts in placental islands, and extracellular vesicles in intervillous spaces. Pregnancy represents a state of increased proteostatic stress. sPE and HELLP were characterized by significant upregulation in circulating levels and lytic activity of the proteasome that was partially explained by placental immunoproteasome upregulation.
Collapse
Affiliation(s)
- Kathryn Berryman
- From the Department of Obstetrics and Gynecology (K.B., C.S.B.), The Ohio State University College of Medicine, Columbus
| | - Catalin S Buhimschi
- From the Department of Obstetrics and Gynecology (K.B., C.S.B.), The Ohio State University College of Medicine, Columbus.,Department of Pediatrics (C.S.B., I.A.B.), The Ohio State University College of Medicine, Columbus
| | - Guomao Zhao
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH (G.Z., M.A., M.L., I.A.B.)
| | - Michelle Axe
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH (G.Z., M.A., M.L., I.A.B.)
| | - Megan Locke
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH (G.Z., M.A., M.L., I.A.B.)
| | - Irina A Buhimschi
- Department of Pediatrics (C.S.B., I.A.B.), The Ohio State University College of Medicine, Columbus.,Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH (G.Z., M.A., M.L., I.A.B.)
| |
Collapse
|
8
|
The Contribution of the 20S Proteasome to Proteostasis. Biomolecules 2019; 9:biom9050190. [PMID: 31100951 PMCID: PMC6571867 DOI: 10.3390/biom9050190] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 05/07/2019] [Accepted: 05/12/2019] [Indexed: 12/22/2022] Open
Abstract
The last decade has seen accumulating evidence of various proteins being degraded by the core 20S proteasome, without its regulatory particle(s). Here, we will describe recent advances in our knowledge of the functional aspects of the 20S proteasome, exploring several different systems and processes. These include neuronal communication, post-translational processing, oxidative stress, intrinsically disordered protein regulation, and extracellular proteasomes. Taken together, these findings suggest that the 20S proteasome, like the well-studied 26S proteasome, is involved in multiple biological processes. Clarifying our understanding of its workings calls for a transformation in our perception of 20S proteasome-mediated degradation—no longer as a passive and marginal path, but rather as an independent, coordinated biological process. Nevertheless, in spite of impressive progress made thus far, the field still lags far behind the front lines of 26S proteasome research. Therefore, we also touch on the gaps in our knowledge of the 20S proteasome that remain to be bridged in the future.
Collapse
|
9
|
Aronica E, Bauer S, Bozzi Y, Caleo M, Dingledine R, Gorter JA, Henshall DC, Kaufer D, Koh S, Löscher W, Louboutin JP, Mishto M, Norwood BA, Palma E, Poulter MO, Terrone G, Vezzani A, Kaminski RM. Neuroinflammatory targets and treatments for epilepsy validated in experimental models. Epilepsia 2017; 58 Suppl 3:27-38. [PMID: 28675563 DOI: 10.1111/epi.13783] [Citation(s) in RCA: 123] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/24/2017] [Indexed: 12/16/2022]
Abstract
A large body of evidence that has accumulated over the past decade strongly supports the role of inflammation in the pathophysiology of human epilepsy. Specific inflammatory molecules and pathways have been identified that influence various pathologic outcomes in different experimental models of epilepsy. Most importantly, the same inflammatory pathways have also been found in surgically resected brain tissue from patients with treatment-resistant epilepsy. New antiseizure therapies may be derived from these novel potential targets. An essential and crucial question is whether targeting these molecules and pathways may result in anti-ictogenesis, antiepileptogenesis, and/or disease-modification effects. Therefore, preclinical testing in models mimicking relevant aspects of epileptogenesis is needed to guide integrated experimental and clinical trial designs. We discuss the most recent preclinical proof-of-concept studies validating a number of therapeutic approaches against inflammatory mechanisms in animal models that could represent novel avenues for drug development in epilepsy. Finally, we suggest future directions to accelerate preclinical to clinical translation of these recent discoveries.
Collapse
Affiliation(s)
- Eleonora Aronica
- Department of (Neuro)Pathology, Academic Medical Center, Amsterdam, The Netherlands.,Swammerdam Institute for Life Sciences, Center for Neuroscience University of Amsterdam, Amsterdam, The Netherlands.,SEIN-Stichting Epilepsie Instellingen Nederland, Heemstede, The Netherlands
| | - Sebastian Bauer
- Department of Neurology, Philipps University, Marburg, Germany.,Department of Neurology, Epilepsy Center Frankfurt Rhine-Main, Goethe University, Frankfurt am Main, Germany
| | - Yuri Bozzi
- Neuroscience Institute, National Research Council (CNR), Pisa, Italy.,Laboratory of Molecular Neuropathology, Centre for Integrative Biology (CIBIO), University of Trento, Trento, Italy
| | - Matteo Caleo
- Neuroscience Institute, National Research Council (CNR), Pisa, Italy
| | - Raymond Dingledine
- Department of Pharmacology, Emory University School of Medicine, Atlanta, Georgia, U.S.A
| | - Jan A Gorter
- Swammerdam Institute for Life Sciences, Center for Neuroscience University of Amsterdam, Amsterdam, The Netherlands
| | - David C Henshall
- Department of Physiology & Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Daniela Kaufer
- Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, California, U.S.A
| | - Sookyong Koh
- Department of Pediatrics, Emory University, Atlanta, Georgia, U.S.A
| | - Wolfgang Löscher
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine, Hannover, Germany
| | - Jean-Pierre Louboutin
- Department of Basic Medical Sciences, University of the West Indies, Kingston, Jamaica.,Gene Therapy Program, University of Pennsylvania, Philadelphia, Pennsylvania, U.S.A
| | - Michele Mishto
- Charite University Medicine Berlin, Germany.,Berlin Institute of Health, Berlin, Germany
| | - Braxton A Norwood
- Department of Neurology, Philipps University, Marburg, Germany.,Neuroscience Division, Expesicor LLC, Kalispell, Montana, U.S.A
| | - Eleonora Palma
- Department of Physiology and Pharmacology, University of Rome La Sapienza, Rome, Italy
| | - Michael O Poulter
- Robarts Research Institute, University of Western Ontario, London, Ontario, Canada
| | - Gaetano Terrone
- Department of Neuroscience, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy
| | - Annamaria Vezzani
- Department of Neuroscience, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy
| | | |
Collapse
|
10
|
Lower thigh muscle mass is associated with all-cause and cardiovascular mortality in elderly hemodialysis patients. Eur J Clin Nutr 2016; 71:64-69. [PMID: 27759066 DOI: 10.1038/ejcn.2016.186] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 08/23/2016] [Accepted: 08/25/2016] [Indexed: 12/16/2022]
Abstract
BACKGROUND/OBJECTIVES Higher body mass index appears protective in hemodialysis patients, although it remains to be determined which component of muscle or fat mass is primarily associated with this survival advantage. SUBJECTS/METHODS Eighty-one hemodialysis patients in our institution were prospectively followed from July 2011 to August 2015. Muscle and fat mass were evaluated by measuring the cross-sectional areas of the thigh and abdomen using computed tomography. The relationship between muscle and fat mass, and all-cause and cardiovascular mortality was studied using the Kaplan-Meier analyses and multivariate Cox proportional hazard models. RESULTS During more than 4 years of follow-up, 26 patients (32%) died. In the Kaplan-Meier curve analyses, lower thigh muscle mass was significantly associated with all-cause and cardiovascular mortality (log-rank test, P<0.01 and P<0.001, respectively), but there was no such association with thigh fat, abdominal muscle and fat mass levels. In multivariate Cox proportional hazard models, each 0.1 cm2/kg increase in the thigh muscle area adjusted by dry weight was associated with an estimated 22% lower risk of all-cause mortality (95% confidence interval (95% CI), 0.64-0.95, P<0.05) and a 30% lower risk of cardiovascular mortality (95% CI, 0.54-0.90, P<0.01). CONCLUSIONS Lower thigh muscle mass is significantly associated with all-cause and cardiovascular mortality in hemodialysis patients. Our findings indicate the importance of focusing on the muscle mass of lower extremities to predict the clinical outcomes of hemodialysis patients.
Collapse
|