1
|
Levey A, Elsayed M, Lawson D, Ermentrout R, Kudchadkar R, Bercu Z, Yushak M, Newsome J, Kokabi N. 03:18 PM Abstract No. 230 Predictors of overall and progression-free survival in patients with ocular melanoma metastatic to the liver undergoing Y90 radioembolization: a 15-year single-institution experience. J Vasc Interv Radiol 2019. [DOI: 10.1016/j.jvir.2018.12.289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
2
|
Park M, Katz R, Shlipak MG, Weiner D, Tracy R, Jotwani V, Hughes-Austin J, Gabbai F, Hsu CY, Pfeffer M, Bansal N, Bostom A, Gutierrez O, Sarnak M, Levey A, Ix JH. Urinary Markers of Fibrosis and Risk of Cardiovascular Events and Death in Kidney Transplant Recipients: The FAVORIT Trial. Am J Transplant 2017; 17:2640-2649. [PMID: 28371433 PMCID: PMC5620109 DOI: 10.1111/ajt.14284] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Revised: 03/13/2017] [Accepted: 03/18/2017] [Indexed: 01/25/2023]
Abstract
Cardiovascular risk remains high in kidney transplant recipients (KTRs) despite improved kidney function after transplant. Urinary markers of kidney fibrosis and injury may help to reveal mechanisms of this risk. In a case-cohort study among stable KTRs who participated in the FAVORIT trial, we measured four urinary proteins known to correlate with kidney tubulointerstitial fibrosis on biopsy (urine alpha 1 microglobulin [α1m], monocyte chemoattractant protein-1 [MCP-1], procollagen type I [PINP] and type III [PIIINP] N-terminal amino peptide) and evaluated associations with cardiovascular disease (CVD) events (n = 300) and death (n = 371). In adjusted models, higher urine α1m (hazard ratio [HR] per doubling of biomarker 1.40 [95% confidence interval [CI] 1.21, 1.62]), MCP-1 (HR 1.18 [1.03, 1.36]), and PINP (HR 1.13 [95% CI 1.03, 1.23]) were associated with CVD events. These three markers were also associated with death (HR per doubling α1m 1.51 [95% CI 1.32, 1.72]; MCP-1 1.31 [95% CI 1.13, 1.51]; PINP 1.11 [95% CI 1.03, 1.20]). Higher concentrations of urine α1m, MCP-1, and PINP may identify KTRs at higher risk for CVD events and death. These markers may identify a systemic process of fibrosis involving both the kidney and cardiovascular system, and give new insights into mechanisms linking the kidney with CVD.
Collapse
Affiliation(s)
- M Park
- Division of Nephrology, Department of Medicine, University of California San Francisco, San Francisco, California,Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California
| | - R Katz
- Kidney Research Institute, Division of Nephrology, University of Washington, Seattle, Washington
| | - M G Shlipak
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California,General Internal Medicine Section, San Francisco Veterans Affairs Hospital, San Francisco, California,Division of General Internal Medicine, Department of Medicine, University of California San Francisco, San Francisco, California
| | - D Weiner
- Division of Nephrology, Department of Medicine, Tufts Medical Center, Boston, Massachusetts
| | - R Tracy
- Department of Pathology, University of Vermont, Burlington, Vermont
| | - V Jotwani
- Division of Nephrology, Department of Medicine, University of California San Francisco, San Francisco, California
| | - J Hughes-Austin
- Division of Preventive Medicine, Department of Preventive Medicine and Public Health, University of California San Diego, San Diego, California
| | - F Gabbai
- Division of Nephrology-Hypertension, Department of Medicine, University of California San Diego, San Diego, California,Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California
| | - CY Hsu
- Division of Nephrology, Department of Medicine, University of California San Francisco, San Francisco, California
| | - M Pfeffer
- Division of Cardiology, Brigham and Women's Hospital, Boston, Massachusetts
| | - N Bansal
- Kidney Research Institute, Division of Nephrology, University of Washington, Seattle, Washington
| | - A Bostom
- Rhode Island Hospital, Providence, Rhode Island
| | - O Gutierrez
- Departments of Medicine and Epidemiology, University of Alabama at Birmingham, Birmingham, AL
| | - M Sarnak
- Division of Nephrology, Department of Medicine, Tufts Medical Center, Boston, Massachusetts
| | - A Levey
- Division of Nephrology, Department of Medicine, Tufts Medical Center, Boston, Massachusetts
| | - J H Ix
- Division of Preventive Medicine, Department of Preventive Medicine and Public Health, University of California San Diego, San Diego, California,Division of Nephrology-Hypertension, Department of Medicine, University of California San Diego, San Diego, California,Nephrology Section, Veterans Affairs San Diego Healthcare System, San Diego, California
| |
Collapse
|
3
|
Van Sloten T, Mitchell G, Sigurdsson S, Van Buchem M, Jonsson P, Garcia M, Harris T, Henry R, Levey A, Stehouwer C, Gudnason V, Launer L. P4.8 ARTERIAL STIFFNESS IS ASSOCIATED WITH DEPRESSIVE SYMPTOMS AND THIS ASSOCIATION IS PARTLY MEDIATED BY CEREBRAL SMALL VESSEL DISEASE: THE AGES-REYKJAVIK STUDY. Artery Res 2014. [DOI: 10.1016/j.artres.2014.09.131] [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: 10/24/2022] Open
|
4
|
Hu W, Basra S, Watts K, Glass J, Lah J, Levey A. Cerebrospinal Fluid beta-Amyloid 1-42 Solubility Is Influenced by Apolipoproteins E and J (S14.002). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.s14.002] [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: 11/15/2022] Open
|
5
|
Abstract
BACKGROUND Testosterone deficiency, a treatable condition commonly seen in aging men, has been linked to Parkinson disease (PD) and Alzheimer disease (AD). In normal subjects, low testosterone levels are associated with cognitive and neuropsychiatric symptoms, yet the relationship between testosterone levels and cognitive function in PD and AD remains unclear. OBJECTIVE To examine the relationship of testosterone levels to age and cognitive function in PD and AD. METHODS Plasma testosterone levels were determined in men enrolled in a clinical registry of subjects with PD and AD, and neuropsychological testing was performed on subjects who consented. Testosterone levels in men with PD were compared with those in men with AD. In both groups, the relationship between testosterone levels and neuropsychological test scores was analyzed, adjusting for age and education. RESULTS Linear regression analysis revealed that testosterone levels decreased with age in male PD patients (p < 0.03) and male AD patients (p < 0.07). The rate of decline was similar for the two groups. In PD patients, lower testosterone levels were associated with poorer performance on Trails B Seconds (p < 0.02). CONCLUSIONS There is a similar age-related decline in plasma testosterone levels in men with either PD or AD. Previously described associations between low testosterone levels and frontal lobe dysfunction in normal aged men, together with these results, suggest that the hormonal deficiency may act as a "second hit" to impair cognitive function in neurodegenerative disease.
Collapse
Affiliation(s)
- M S Okun
- Department of Neurology, University of Florida, McKnight Brain Institute, Gainesville 32610, USA.
| | | | | | | | | |
Collapse
|
6
|
Mesulam MM, Guillozet A, Shaw P, Levey A, Duysen EG, Lockridge O. Acetylcholinesterase knockouts establish central cholinergic pathways and can use butyrylcholinesterase to hydrolyze acetylcholine. Neuroscience 2002; 110:627-39. [PMID: 11934471 DOI: 10.1016/s0306-4522(01)00613-3] [Citation(s) in RCA: 453] [Impact Index Per Article: 20.6] [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: 10/18/2022]
Abstract
Acetylcholinesterase is one of the most prominent constituents of central cholinergic pathways. It terminates the synaptic action of acetylcholine through hydrolysis and yields the choline moiety that is necessary for transmitter recycling. Despite these pivotal relationships, mice nullizygous for acetylcholinesterase established all principal anatomical components of central cholinergic pathways. No compensatory increase in the distribution of butyrylcholinesterase was detected. However, both the wild-type and nullizygous mice showed that butyrylcholinesterase enzyme activity extended to all parts of the brain receiving cholinergic innervation and that it could hydrolyze the acetylcholine surrogate acetylthiocholine. As opposed to acetylcholinesterase which was mostly of neuronal origin, butyrylcholinesterase appeared to be mostly of glial origin. These experiments lead to the unexpected conclusion that acetylcholinesterase is not necessary for the establishment of cholinergic pathways. They also show that butyrylcholinesterase can potentially substitute for acetylcholinesterase and that this enzyme is likely to play a constitutive (rather than just back-up) role in the hydrolysis of acetylcholine in the normal brain. The inhibition of butyrylcholinesterase may therefore provide a desirable feature of cholinergic therapies, including those aimed at treating Alzheimer's disease.
Collapse
Affiliation(s)
- M-M Mesulam
- Cognitive Neurology and ALzheimer's Disease Center, Department of Neurology, Northwestern University, Chicago, IL 60611, USA.
| | | | | | | | | | | |
Collapse
|
7
|
Fleischer EB, Gebala AE, Levey A, Tasker PA. Conversion of aliphatic and alicyclic polyalcohols to the corresponding primary polyamines. J Org Chem 2002. [DOI: 10.1021/jo00819a031] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
8
|
Freeman A, Ciliax B, Bakay R, Daley J, Miller RD, Keating G, Levey A, Rye D. Nigrostriatal collaterals to thalamus degenerate in parkinsonian animal models. Ann Neurol 2001; 50:321-9. [PMID: 11558788 DOI: 10.1002/ana.1119] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.1] [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: 12/22/2022]
Abstract
Movement, cognition, emotion, and positive reinforcement are influenced by mesostriatal, mesocortical, and mesolimbic dopamine systems. We describe a fourth major pathway originating from mesencephalic dopamine neurons: a mesothalamic system. The dopamine transporter, specific to dopamine containing axons, was histochemically visualized in thalamic motor and limbic-related nuclei and regions that modulate behavioral state as opposed to sensory nuclei in rats, nonhuman primates, and humans. Anatomical tracing established this innervation's origin via axon collaterals from the mesostriatal pathway. These findings implicate the thalamus as a novel site for disease specific alterations in dopamine neurotransmission, such as exist with nigral degeneration attending Parkinson's disease. This was confirmed in hemiparkinsonian animals where reduction of thalamic dopamine innervation occurred coincident with signs of active axonal degeneration. Individual mesencephalic dopamine neurons therefore have the potential to modulate normal and pathologic behavior not only through traditional nigrostriatal pathways but also by way of axon collaterals that innervate the thalamus.
Collapse
Affiliation(s)
- A Freeman
- Emory University, Department of Neurology, Atlanta, GA 30322, USA
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Kim SH, Lah JJ, Thinakaran G, Levey A, Sisodia SS. Subcellular localization of presenilins: association with a unique membrane pool in cultured cells. Neurobiol Dis 2000; 7:99-117. [PMID: 10783294 DOI: 10.1006/nbdi.1999.0280] [Citation(s) in RCA: 45] [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] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We have investigated the subcellular distribution of presenilin-1 (PS1) and presenilin-2 (PS2) in a variety of mammalian cell lines. In Iodixanol-based density gradients, PS1 derivatives show a biphasic distribution, cofractionating with membranes containing ER-resident proteins and an additional population of membranes with low buoyant density that do not contain markers of the Golgi complex, ERGIC, COP II vesicles, ER exit compartment, COP II receptor, Golgi SNARE, trans-Golgi network, caveolar membranes, or endocytic vesicles. Confocal immunofluorescence and immunoelectron microscopy studies fully supported the fractionation studies. These data suggest that PS1 fragments accumulate in a unique subcompartment(s) of the ER or ER to Golgi trafficking intermediates. Interestingly, the FAD-linked PS1 variants show a marked redistribution toward the heavier region of the gradient. Finally, and in contrast to PS1, PS2 fragments are detected preponderantly in more densely sedimenting membranes, suggesting that the subcellular compartments in which these molecules accumulate are distinct.
Collapse
Affiliation(s)
- S H Kim
- Department of Neurobiology, Pharmacology and Physiology, University of Chicago, Chicago, Illinois, 60637, USA
| | | | | | | | | |
Collapse
|
10
|
Levey A. New Jersey strives to give seniors more housing options. Provider 2000; 26:13. [PMID: 10787746] [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: 02/16/2023]
|
11
|
Levey A. Law calls for study of assisted living programs for veterans. Provider 2000; 26:14. [PMID: 10787748] [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: 02/16/2023]
|
12
|
Levey A. JCAHO, CARF issue draft standards for assisted living. Provider 2000; 26:15-6. [PMID: 10747752] [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: 02/16/2023]
|
13
|
Abstract
The Karhunen-Loeve (KL) transform is an optimal method for approximating a set of vectors or images, which was used in image processing and computer vision for several tasks such as face and object recognition. Its computational demands and its batch calculation nature have limited its application. Here we present a new, sequential algorithm for calculating the KL basis, which is faster in typical applications and is especially advantageous for image sequences: the KL basis calculation is done with much lower delay and allows for dynamic updating of image databases. Systematic tests of the implemented algorithm show that these advantages are indeed obtained with the same accuracy available from batch KL algorithms.
Collapse
Affiliation(s)
- A Levey
- HP Laboratories-Israel, Technion City, Haifa 32000, Israel.
| | | |
Collapse
|
14
|
Zager PG, Nikolic J, Brown RH, Campbell MA, Hunt WC, Peterson D, Van Stone J, Levey A, Meyer KB, Klag MJ, Johnson HK, Clark E, Sadler JH, Teredesai P. "U" curve association of blood pressure and mortality in hemodialysis patients. Medical Directors of Dialysis Clinic, Inc. Kidney Int 1998; 54:561-9. [PMID: 9690224 DOI: 10.1046/j.1523-1755.1998.00005.x] [Citation(s) in RCA: 482] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Hypertension may play an important role in the pathogenesis of the excess cardiovascular and cerebrovascular (CV) morbidity observed in hemodialysis patients (HD). However, the optimal blood pressure (BP) range for HD patients has not been defined. We postulated that there is a "U" curve relationship between BP and CV mortality. To explore this hypothesis we studied 5,433 HD patients in Dialysis Clinic Inc., a large not-for-profit chain, over a five year period. METHODS Cox regression, with fixed and time-varying covariates, was used to assess the effect of systolic blood pressure (SBP) and diastolic blood pressure (DBP), pre- and post-dialysis, on CV mortality, while adjusting for age, gender, ethnicity, primary cause of end-stage renal disease, Kt/V, serum albumin, and antihypertensive medications. RESULTS The overall impact of BP on CV mortality was modest. Pre-dialysis, neither systolic nor diastolic hypertension were associated with an increase in CV mortality. Post-dialysis, SBP > or = 180 mm Hg (RR = 1.96, P < 0.015) and DBP > or = 90 mm Hg (RR = 1.73, P < 0.05) were associated with increased CV mortality. Low SBP (SBP < 110 mm Hg) was associated with increased CV mortality, pre- and post-dialysis. CONCLUSIONS The results suggest the presence of a "U" curve relationship between SBP post-dialysis and CV mortality in HD patients.
Collapse
Affiliation(s)
- P G Zager
- Dialysis Clinic, Inc., Nashville, Tennessee, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Kumar R, Alpern R, Berl T, Blantz R, Chevalier R, Hostetter T, Madias N, Salant D, Wiggins R, Bennett W, Chapman A, Ekonyan G, Falk R, Gennari FJ, Helderman JH, Hruska K, Levey A, Lindheimer M, Miller R, Nissenson A, Schwab S, Schwab T, Schwartz R, Wilcox C. Nephrology core curriculum. The American Society of Nephrology and the American Society of Nephrology Training Program Directors Committee. J Am Soc Nephrol 1997; 8:1018-27. [PMID: 9189871 DOI: 10.1681/asn.v861018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
|
16
|
Abstract
We do not believe the claim that "evaluative conditioning is a qualitatively distinct form of classical conditioning" [Davey (1994). Behaviour Research and Therapy, 32, 291-299]. We view all classical conditioning as a learning process which leads organisms to assign a positive or negative value to previously neutral stimuli and to respond to them accordingly. The evaluative response is a necessary component of this process and hence it is central to all classical conditioning, not a separate type. Davey concentrates on a signal-based information processing view of learning, i.e. the formation of linear associations between CS and UCS of which human subjects are aware and which they can verbalize. We propose a more primitive and more general model in which stimulus evaluation (like/dislike) occurs with a minimal degree of processing, and enters into a representation of stimulus (CS and UCS) and response (CR and UCR) characteristics which is reintegrative rather than associative.
Collapse
Affiliation(s)
- I Martin
- Department of Psychology, Institute of Psychiatry, Denmark Hill, London, England
| | | |
Collapse
|
17
|
|
18
|
Summers JJ, Sommer JA, Sharp CA, Levey A, Murray KD. The coding of constrained and preselected movement distance: same-limb versus switched-limb reproduction. Acta Psychol (Amst) 1982; 51:75-89. [PMID: 7136847 DOI: 10.1016/0001-6918(82)90020-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
|
19
|
Martin T, Billings P, Levey A, Ozarslan S, Quinlan T, Swift H, Urbas L. Some properties of RNA:protein complexes from the nucleus of eukaryotic cells. Cold Spring Harb Symp Quant Biol 1974; 38:921-32. [PMID: 4364788 DOI: 10.1101/sqb.1974.038.01.094] [Citation(s) in RCA: 80] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|