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Gold DA, Sandesara PB, Kindya B, Gold ME, Jain V, Vatsa N, Desai SR, Yadalam A, Razavi A, Elhage Hassan M, Ko YA, Liu C, Alkhoder A, Rahbar A, Hossain MS, Waller EK, Jaber WA, Nicholson WJ, Quyyumi AA. Circulating Progenitor Cells and Coronary Collaterals in Chronic Total Occlusion. Int J Cardiol 2024; 407:132104. [PMID: 38677332 DOI: 10.1016/j.ijcard.2024.132104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 04/18/2024] [Accepted: 04/24/2024] [Indexed: 04/29/2024]
Abstract
BACKGROUND The role of circulating progenitor cells (CPC) in collateral formation that occurs in the presence of chronic total occlusions (CTO) of a coronary artery is not well established. In stable patients with a CTO, we investigated whether CPC levels are associated with (a) collateral development and (b) ischemic burden, as measured by circulating high sensitivity troponin-I (hsTn-I) levels. METHODS CPCs were enumerated by flow cytometry as CD45med+ blood mononuclear cells expressing CD34 and both CD34 and CD133 epitopes. The association between CPC counts and both Rentrop collateral grade (0, 1, 2, or 3) and hsTn-I levels were evaluated using multivariate regression analysis, after adjusting for demographic and clinical characteristics. RESULTS In 89 patients (age 65.5, 72% male, 27% Black), a higher CPC count was positively associated with a higher Rentrop collateral grade; [CD34+ adjusted odds ratio (OR) 1.49 95% confidence interval (CI) (0.95, 2.34) P = 0.082] and [CD34+/CD133+ OR 1.57 95% CI (1.05, 2.36) P = 0.028]. Every doubling of CPC counts was also associated with lower hsTn-I levels [CD34+ β -0.35 95% CI (-0.49, -0.15) P = 0.002] and [CD34+/CD133+ β -0.27 95% CI (-0.43, -0.08) P = 0.009] after adjustment. CONCLUSION Individuals with higher CPC counts have greater collateral development and lower ischemic burden in the presence of a CTO.
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Affiliation(s)
- Daniel A Gold
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Pratik B Sandesara
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Bryan Kindya
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Matthew E Gold
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Vardhmaan Jain
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Nishant Vatsa
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Shivang R Desai
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Adithya Yadalam
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Alexander Razavi
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Malika Elhage Hassan
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Yi-An Ko
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia
| | - Chang Liu
- Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia
| | - Ayman Alkhoder
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Alireza Rahbar
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Mohammad S Hossain
- Division of Hematology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Edmund K Waller
- Division of Hematology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Wissam A Jaber
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - William J Nicholson
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Arshed A Quyyumi
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia.
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Gold ME, Rogers SC, Kulshreshtha A, Chen Y, Ko YA, Cheng ML, Gold DA, Vatsa N, Jain V, Desai S, Moazzami K, Thomas T, Okafor M, Goldstein F, Lah J, Quyyumi AA, Hajjar I. Contribution of Peripheral Microvascular Dysfunction to Mild Cognitive Impairment. Am J Cardiol 2024; 218:4-6. [PMID: 38452841 PMCID: PMC11023756 DOI: 10.1016/j.amjcard.2024.02.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 02/02/2024] [Accepted: 02/23/2024] [Indexed: 03/09/2024]
Affiliation(s)
- Matthew E Gold
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Steven C Rogers
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Ambar Kulshreshtha
- Department of Family and Preventative Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Yuxuan Chen
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia
| | - Yi-An Ko
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia; Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia
| | - Michael L Cheng
- Department of Medicine, and Emory University School of Medicine, Atlanta, Georgia
| | - Daniel A Gold
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Nishant Vatsa
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Vardhmaan Jain
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Shivang Desai
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Kasra Moazzami
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Tiffany Thomas
- Department of Neurology, Emory University School of Medicine, Atlanta, Georgia
| | - Maureen Okafor
- Department of Neurology, Emory University School of Medicine, Atlanta, Georgia
| | - Felicia Goldstein
- Department of Neurology, Emory University School of Medicine, Atlanta, Georgia
| | - James Lah
- Department of Neurology, Emory University School of Medicine, Atlanta, Georgia
| | - Arshed A Quyyumi
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia.
| | - Ihab Hajjar
- Department of Neurology, University of Texas Southwestern Medical Center, Dallas, Texas
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Gold DA, Sandesara PB, Jain V, Gold ME, Vatsa N, Desai SR, Hassan ME, Yuan C, Ko YA, Ejaz K, Alvi Z, Jaber WA, Nicholson WJ, Quyyumi AA. Long-Term Outcomes in Patients With Chronic Total Occlusion. Am J Cardiol 2024; 214:59-65. [PMID: 38195045 PMCID: PMC10947430 DOI: 10.1016/j.amjcard.2023.12.052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 11/27/2023] [Accepted: 12/24/2023] [Indexed: 01/11/2024]
Abstract
Although a chronic total occlusion (CTO) in the setting of an acute coronary syndrome is associated with greater risk, the prognosis of patients with a CTO and stable coronary artery disease (CAD) remains unknown. This study aimed to investigate adverse event rates in patients with stable CAD with and without a CTO. In 3,597 patients with stable CAD (>50% coronary luminal stenosis) who underwent cardiac catheterization, all-cause mortality, cardiovascular mortality, and the composite major adverse cardiac event (MACE) rates for cardiovascular death, myocardial infarction, and heart failure hospitalization were evaluated. Cox proportional hazards and Fine and Gray subdistribution hazard models were used to compare event-free survival in patient subsets after adjustment for covariates. Event rates were higher in patients with CTOs than in those without CTOs after adjusting for demographic and clinical characteristics (cardiovascular death hazard ratio [HR] 1.29, 95% confidence interval [CI] 1.05 to 1.57, p = 0.012). Patients with CTO revascularization had lower event rates than those of patients without CTO revascularization (cardiovascular death HR 0.43, CI 0.26 to 0.70, p = 0.001). Those with nonrevascularized CTOs were at particularly great risk when compared with those without CTO (cardiovascular death HR 1.52, CI 1.25 to 1.84, p <0.001). Moreover, those with revascularized CTOs had similar event rates to those of patients with CAD without CTOs. Patients with CTO have higher rates of adverse cardiovascular events than those of patients with significant CAD without CTO. This risk is greatest in patients with nonrevascularized CTO.
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Affiliation(s)
- Daniel A Gold
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Pratik B Sandesara
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Vardhmaan Jain
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Matthew E Gold
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Nishant Vatsa
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Shivang R Desai
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Malika Elhage Hassan
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Chenyang Yuan
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia
| | - Yi-An Ko
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia
| | - Kiran Ejaz
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Zain Alvi
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Wissam A Jaber
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - William J Nicholson
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Arshed A Quyyumi
- Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia.
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4
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Jain V, Mehta A, Lee TB, Liu C, Chew NWS, Ko Y, Gold ME, Gold DA, Vatsa N, Desai SR, Kim JH, Rahbar A, Haroun Y, Ejaz K, Hayek SS, Siddiqui MS, Salloum FN, Sperling LS, Sanyal AJ, Quyyumi AA. Immune Activation Mediates the Association of Advanced Hepatic Fibrosis With Adverse Outcomes in Patients With Coronary Artery Disease. J Am Heart Assoc 2023; 12:e031230. [PMID: 38063161 PMCID: PMC10863787 DOI: 10.1161/jaha.123.031230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 10/31/2023] [Indexed: 12/20/2023]
Abstract
BACKGROUND Literature suggests a bidirectional association between advanced hepatic fibrosis (AHF) and coronary artery disease (CAD). We evaluated the association of AHF with immune activation, systemic inflammation, and adverse outcomes in patients with CAD. METHODS AND RESULTS A fibrosis-4 index cutoff value ≥2.67 was used to define AHF. Circulating levels of soluble urokinase plasminogen activator receptor and hsCRP (high-sensitivity C-reactive protein) were measured as markers for immune activation and systemic inflammation, respectively. The relationship of AHF with soluble urokinase plasminogen activator receptor, hsCRP, and adverse cardiovascular outcomes was evaluated. Among 3406 participants with CAD, 479 had AHF. Participants with AHF were older; were less likely to be Black individuals; and had a lower body mass index, worse renal function, and a prior history of heart failure. In multivariable linear regression models adjusted for clinical and demographic confounders, participants with AHF had 15.6% higher soluble urokinase plasminogen activator receptor and 24.0% higher hsCRP levels. They were more likely to experience the following adverse outcomes: all-cause death (adjusted hazard ratio [HR], 1.57 ([95% CI, 1.29-1.92]; P<0.001) and cardiovascular death: (subdistribution HR, 1.50 [95% CI, 1.14-1.95]; P=0.003). Mediation analysis showed that 47.0% (95% CI, 13.6%-81.2%]; P=0.006) of the indirect effect of AHF on cardiovascular death was mediated by circulating soluble urokinase plasminogen activator receptor levels. CONCLUSIONS AHF is independently associated with immune activation, systemic inflammation, and adverse cardiovascular outcomes in patients with CAD. The association of AHF with adverse outcomes is partly mediated by immune activation, and targeting this pathway may help reduce the residual risk in patients with CAD.
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Affiliation(s)
- Vardhmaan Jain
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Anurag Mehta
- Virginia Commonwealth University Health Pauley Heart CenterRichmondVAUSA
| | - Terence B. Lee
- Virginia Commonwealth University Health Pauley Heart CenterRichmondVAUSA
| | - Chang Liu
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Nicholas W. S. Chew
- Department of CardiologyNational University Heart Centre, National University Health SystemSingapore
| | - Yi‐An Ko
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Matthew E. Gold
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Daniel A. Gold
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Nishant Vatsa
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Shivang R. Desai
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Jonathan H. Kim
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Alireza Rahbar
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Yazan Haroun
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Kiran Ejaz
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Salim S. Hayek
- Department of Internal MedicineUniversity of Michigan Medical SchoolAnn ArborMIUSA
| | | | - Fadi N. Salloum
- Virginia Commonwealth University Health Pauley Heart CenterRichmondVAUSA
| | - Laurence S. Sperling
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
| | - Arun J. Sanyal
- Virginia Commonwealth University Stravitz‐Sanyal Liver InstituteRichmondVAUSA
| | - Arshed A. Quyyumi
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGAUSA
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Brunoir T, Mulligan C, Sistiaga A, Vuu KM, Shih PM, O'Reilly SS, Summons RE, Gold DA. Common origin of sterol biosynthesis points to a feeding strategy shift in Neoproterozoic animals. Nat Commun 2023; 14:7941. [PMID: 38040676 PMCID: PMC10692144 DOI: 10.1038/s41467-023-43545-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 11/13/2023] [Indexed: 12/03/2023] Open
Abstract
Steranes preserved in sedimentary rocks serve as molecular fossils, which are thought to record the expansion of eukaryote life through the Neoproterozoic Era ( ~ 1000-541 Ma). Scientists hypothesize that ancient C27 steranes originated from cholesterol, the major sterol produced by living red algae and animals. Similarly, C28 and C29 steranes are thought to be derived from the sterols of prehistoric fungi, green algae, and other microbial eukaryotes. However, recent work on annelid worms-an advanced group of eumetazoan animals-shows that they are also capable of producing C28 and C29 sterols. In this paper, we explore the evolutionary history of the 24-C sterol methyltransferase (smt) gene in animals, which is required to make C28+ sterols. We find evidence that the smt gene was vertically inherited through animals, suggesting early eumetazoans were capable of C28+ sterol synthesis. Our molecular clock of the animal smt gene demonstrates that its diversification coincides with the rise of C28 and C29 steranes in the Neoproterozoic. This study supports the hypothesis that early eumetazoans were capable of making C28+ sterols and that many animal lineages independently abandoned its biosynthesis around the end-Neoproterozoic, coinciding with the rise of abundant eukaryotic prey.
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Affiliation(s)
- T Brunoir
- Department of Earth and Planetary Sciences, University of California, Davis, Davis, CA, USA
| | - C Mulligan
- Department of Earth and Planetary Sciences, University of California, Davis, Davis, CA, USA
| | - A Sistiaga
- Globe Institute, University of Copenhagen, Copenhagen, Denmark
| | - K M Vuu
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - P M Shih
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA, USA
| | - S S O'Reilly
- Department of Life Sciences, Atlantic Technological University, ATU Sligo, Ash Lane, Sligo, Ireland
| | - R E Summons
- Department of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology, Cambridge, MA, USA
| | - D A Gold
- Department of Earth and Planetary Sciences, University of California, Davis, Davis, CA, USA.
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Gold DA, Sandesara PB, Jain V, Gold ME, Vatsa N, Desai SR, Hassan ME, Yuan C, Ko Y, Alkhoder A, Ejaz K, Alvi Z, Rahbar A, Murtagh G, Jaber WA, Nicholson WJ, Quyyumi AA. High Sensitivity Troponin Level and Benefits of Chronic Total Occlusion Revascularization. J Am Heart Assoc 2023; 12:e031431. [PMID: 37929763 PMCID: PMC10727412 DOI: 10.1161/jaha.123.031431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 09/29/2023] [Indexed: 11/07/2023]
Abstract
Background The survival benefit of revascularization of chronic total occlusion (CTO) of the coronary arteries remains a subject of controversy. We measured high sensitivity troponin-I (hsTn-I) levels as an estimate of myocardial ischemia in patients with stable coronary artery disease, with the hypothesis that (1) patients with CTO have higher levels of hsTn-I than patients without CTO, (2) hsTn-I levels will predict adverse cardiovascular events in patients with CTO, and (3) patients with elevated hsTn-I levels will have a survival benefit from CTO revascularization. Methods and Results In 428 patients with stable coronary artery disease and CTO undergoing coronary angiography, adverse event rates were investigated. Cox proportional hazards models and Fine and Gray subdistribution hazard models were performed to determine the association between hsTn-I level and incident event rates in patients with CTO. HsTn-I levels were higher in patients with compared with those without CTO (median 6.7 versus 5.6 ng/L, P=0.002). An elevated hsTn-I level was associated with higher adverse event rates (adjusted all-cause mortality hazard ratio, 1.19 [95% CI, 1.08-1.32]; P=0.030) for every doubling of hsTn-I level. CTO revascularization was performed in 28.3% of patients. In patients with a high (>median) hsTn-I level, CTO revascularization was associated with substantially lower all-cause mortality (adjusted hazard ratio, 0.26 [95% CI, 0.08-0.88]; P=0.030) compared with those who did not undergo revascularization. In patients with a low (
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Affiliation(s)
- Daniel A. Gold
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Pratik B. Sandesara
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Vardhmaan Jain
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Matthew E. Gold
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Nishant Vatsa
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Shivang R. Desai
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Malika Elhage Hassan
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Chenyang Yuan
- Department of Biostatistics and Bioinformatics, Rollins School of Public HealthEmory UniversityAtlantaGA
| | - Yi‐An Ko
- Department of Biostatistics and Bioinformatics, Rollins School of Public HealthEmory UniversityAtlantaGA
| | - Ayman Alkhoder
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Kiran Ejaz
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Zain Alvi
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Alireza Rahbar
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | | | - Wissam A. Jaber
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - William J. Nicholson
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
| | - Arshed A. Quyyumi
- Division of Cardiology, Department of MedicineEmory Clinical Cardiovascular Research Institute, Emory University School of MedicineAtlantaGA
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De Niz M, Gold DA, Kumar S, Mast FD, Richard D, Simões ML. Editorial: Rising stars in parasite and host 2022. Front Cell Infect Microbiol 2022; 12:1054309. [PMID: 36601303 PMCID: PMC9806843 DOI: 10.3389/fcimb.2022.1054309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 10/17/2022] [Indexed: 12/23/2022] Open
Affiliation(s)
- Mariana De Niz
- Department of Parasites and Insect Vectors, Institut Pasteur, Paris, France,*Correspondence: Mariana De Niz, ; Daniel A. Gold, ; Dave Richard, ; Maria L. Simões,
| | - Daniel A. Gold
- St. Edward’s University, School of Natural Sciences, Austin, TX, United States,*Correspondence: Mariana De Niz, ; Daniel A. Gold, ; Dave Richard, ; Maria L. Simões,
| | - Sudhir Kumar
- Center for Global Infectious Disease Research, Seattle Children’s Research Institute, Seattle, WA, United States
| | - Fred David Mast
- Center for Global Infectious Disease Research, Seattle Children’s Research Institute, Seattle, WA, United States
| | - Dave Richard
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec, Université Laval, Québec, QC, Canada,Infectious Disease Research Centre, Université Laval, Québec, QC, Canada,*Correspondence: Mariana De Niz, ; Daniel A. Gold, ; Dave Richard, ; Maria L. Simões,
| | - Maria L. Simões
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom,*Correspondence: Mariana De Niz, ; Daniel A. Gold, ; Dave Richard, ; Maria L. Simões,
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Gold DA, Nicholson C, Jacobsen G, Hamzavi IH. International Classification of Diseases-based analysis is inaccurate in assessing the prevalence of inflammatory bowel disease in patients with hidradenitis suppurativa. J Am Acad Dermatol 2021; 85:495-497. [PMID: 34092407 DOI: 10.1016/j.jaad.2018.07.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 06/27/2018] [Accepted: 07/23/2018] [Indexed: 11/29/2022]
Affiliation(s)
- Daniel A Gold
- Department of Dermatology, Henry Ford Health System, Detroit, Michigan
| | - Cynthia Nicholson
- Department of Dermatology, Henry Ford Health System, Detroit, Michigan
| | - Gordon Jacobsen
- Department of Dermatology, Henry Ford Health System, Detroit, Michigan
| | - Iltefat H Hamzavi
- Department of Dermatology, Henry Ford Health System, Detroit, Michigan.
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Gold DA, O'Reilly SS, Watson J, Degnan BM, Degnan SM, Krömer JO, Summons RE. Lipidomics of the sea sponge Amphimedon queenslandica and implication for biomarker geochemistry. Geobiology 2017; 15:836-843. [PMID: 28851049 DOI: 10.1111/gbi.12253] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 07/17/2017] [Indexed: 06/07/2023]
Abstract
Demosponges are a rich natural source of unusual lipids, some of which are of interest as geochemical biomarkers. Although demosponges are animals, they often host dense communities of microbial symbionts, and it is therefore unclear which lipids can be synthesized by the animal de novo, and which require input from the microbial community. To address this uncertainty, we analyzed the lipids of Amphimdeon queenslandica, the only demosponge with a published genome. We correlated the genetic and lipid repertoires of A. queenslandica to identify which biomarkers could potentially be synthesized and/or modified by the sponge. The fatty acid profile of A. queenslandica is dominated by an unusual Δ5,9 fatty acid (cis-5,9-hexacosadienoic acid)-similar to what has been found in other members of the Amphimdeon genus-while the sterol profile is dominated by C27 -C29 derivatives of cholesterol. Based on our analysis of the A. queenslandica genome, we predict that this sponge can synthesize sterols de novo, but it lacks critical genes necessary to synthesize basic saturated and unsaturated fatty acids. However, it does appear to have the genes necessary to modify simpler products into a more complex "algal-like" assemblage of unsaturated fatty acids. Ultimately, our results provide additional support for the poriferan affinity of 24-isopropylcholestanes in Neoproterozoic-age rocks (the "sponge biomarker" hypothesis) and suggest that some algal proxies in the geochemical record could also have animal contributions.
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Affiliation(s)
- D A Gold
- Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - S S O'Reilly
- Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - J Watson
- School of Biological Sciences, University of Queensland, Brisbane, QLD, Australia
| | - B M Degnan
- School of Biological Sciences, University of Queensland, Brisbane, QLD, Australia
| | - S M Degnan
- School of Biological Sciences, University of Queensland, Brisbane, QLD, Australia
| | - J O Krömer
- Department for Solar Materials, Helmholtz Center for Environmental Research GmbH - UFZ, Leipzig, Germany
| | - R E Summons
- Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology, Cambridge, MA, USA
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10
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Affiliation(s)
- Shruthi Krishnamurthy
- Department of Pathology, Microbiology and Immunology, University of California Davis, Davis, California, United States of America
| | - Eleni K. Konstantinou
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Lucy H. Young
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Daniel A. Gold
- Department of Pathology, Microbiology and Immunology, University of California Davis, Davis, California, United States of America
| | - Jeroen P. J. Saeij
- Department of Pathology, Microbiology and Immunology, University of California Davis, Davis, California, United States of America
- * E-mail:
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11
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Gold DA, Kaplan AD, Lis A, Bett GCL, Rosowski EE, Cirelli KM, Bougdour A, Sidik SM, Beck JR, Lourido S, Egea PF, Bradley PJ, Hakimi MA, Rasmusson RL, Saeij JPJ. The Toxoplasma Dense Granule Proteins GRA17 and GRA23 Mediate the Movement of Small Molecules between the Host and the Parasitophorous Vacuole. Cell Host Microbe 2016; 17:642-52. [PMID: 25974303 DOI: 10.1016/j.chom.2015.04.003] [Citation(s) in RCA: 167] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 02/09/2015] [Accepted: 03/20/2015] [Indexed: 10/23/2022]
Abstract
Toxoplasma gondii is a protozoan pathogen in the phylum Apicomplexa that resides within an intracellular parasitophorous vacuole (PV) that is selectively permeable to small molecules through unidentified mechanisms. We have identified GRA17 as a Toxoplasma-secreted protein that localizes to the parasitophorous vacuole membrane (PVM) and mediates passive transport of small molecules across the PVM. GRA17 is related to the putative Plasmodium translocon protein EXP2 and conserved across PV-residing Apicomplexa. The PVs of GRA17-deficient parasites have aberrant morphology, reduced permeability to small molecules, and structural instability. GRA17-deficient parasites proliferate slowly and are avirulent in mice. These GRA17-deficient phenotypes are rescued by complementation with Plasmodium EXP2. GRA17 functions synergistically with a related protein, GRA23. Exogenous expression of GRA17 or GRA23 alters the membrane conductance properties of Xenopus oocytes in a manner consistent with a large non-selective pore. Thus, GRA17 and GRA23 provide a molecular basis for PVM permeability and nutrient access.
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Affiliation(s)
- Daniel A Gold
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Aaron D Kaplan
- Physiology and Biophysics, The State University of New York, University at Buffalo, Buffalo, NY 14214, USA; Center for Cellular and Systems Electrophysiology, School of Medicine & Biomedical Sciences, The State University of New York, University at Buffalo, Buffalo, NY 14214, USA
| | - Agnieszka Lis
- Physiology and Biophysics, The State University of New York, University at Buffalo, Buffalo, NY 14214, USA; Center for Cellular and Systems Electrophysiology, School of Medicine & Biomedical Sciences, The State University of New York, University at Buffalo, Buffalo, NY 14214, USA
| | - Glenna C L Bett
- Physiology and Biophysics, The State University of New York, University at Buffalo, Buffalo, NY 14214, USA; Center for Cellular and Systems Electrophysiology, School of Medicine & Biomedical Sciences, The State University of New York, University at Buffalo, Buffalo, NY 14214, USA; Department of Obstetrics and Gynocology, School of Medicine & Biomedical Sciences, The State University of New York, University at Buffalo, Buffalo, NY 14214, USA
| | - Emily E Rosowski
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Kimberly M Cirelli
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Alexandre Bougdour
- UMR5163, LAPM, Centre National de la Recherche Scientifique, 38041 Grenoble, France; Université Joseph Fourier, 38000 Grenoble, France
| | - Saima M Sidik
- Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA
| | - Josh R Beck
- Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | | | - Pascal F Egea
- Department of Biological Chemistry, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - Peter J Bradley
- Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Mohamed-Ali Hakimi
- UMR5163, LAPM, Centre National de la Recherche Scientifique, 38041 Grenoble, France; Université Joseph Fourier, 38000 Grenoble, France
| | - Randall L Rasmusson
- Physiology and Biophysics, The State University of New York, University at Buffalo, Buffalo, NY 14214, USA; Center for Cellular and Systems Electrophysiology, School of Medicine & Biomedical Sciences, The State University of New York, University at Buffalo, Buffalo, NY 14214, USA
| | - Jeroen P J Saeij
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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12
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Gold DA, Reeder VJ, Mahan MG, Hamzavi IH. The prevalence of metabolic syndrome in patients with hidradenitis suppurativa. J Am Acad Dermatol 2014; 70:699-703. [PMID: 24433875 DOI: 10.1016/j.jaad.2013.11.014] [Citation(s) in RCA: 123] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 11/08/2013] [Accepted: 11/09/2013] [Indexed: 11/26/2022]
Abstract
BACKGROUND Metabolic syndrome is a multifaceted disorder strongly associated with increased risk for development of cardiovascular disease. Chronic inflammatory diseases have been associated with metabolic syndrome. Hidradenitis suppurativa is a chronic inflammatory skin disease with significant physical and emotional sequelae. OBJECTIVE We sought to investigate a possible association between hidradenitis suppurativa and metabolic syndrome. METHODS A retrospective chart review of all dermatology clinic encounters over an 18-month period identified 366 patients with an appropriate diagnosis of hidradenitis suppurativa. A control population was created from patients seen in the same clinic during the same time period for the diagnoses of either keloids or verruca vulgaris using the matching criteria of age ±5 years, race, and gender. All participants were examined for characteristics of the metabolic syndrome as defined by the National Cholesterol Education Program Adult Treatment Program III guidelines. RESULTS The prevalence of metabolic syndrome in patients with hidradenitis suppurativa was 50.6%, which was significantly higher than the control group at 30.2% (P < .001). LIMITATIONS This was a retrospective review. Some participants could not be analyzed for metabolic syndrome presence as a result of missing data points. CONCLUSION Our results indicate that patients with hidradenitis suppurativa may be at high risk for metabolic syndrome.
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Affiliation(s)
- Daniel A Gold
- Department of Dermatology, Henry Ford Medical Center, Detroit, Michigan
| | - Virginia J Reeder
- Department of Dermatology, Henry Ford Medical Center, Detroit, Michigan
| | - Meredith G Mahan
- Department of Public Health Sciences, Henry Ford Medical Center, Detroit, Michigan
| | - Iltefat H Hamzavi
- Department of Dermatology, Henry Ford Medical Center, Detroit, Michigan.
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Lim D, Gold DA, Julien L, Rosowski EE, Niedelman W, Yaffe MB, Saeij JPJ. Structure of the Toxoplasma gondii ROP18 kinase domain reveals a second ligand binding pocket required for acute virulence. J Biol Chem 2013; 288:34968-80. [PMID: 24129568 PMCID: PMC3843107 DOI: 10.1074/jbc.m113.523266] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2013] [Revised: 10/13/2013] [Indexed: 12/27/2022] Open
Abstract
At least a third of the human population is infected with the intracellular parasite Toxoplasma gondii, which contributes significantly to the disease burden in immunocompromised and neutropenic hosts and causes serious congenital complications when vertically transmitted to the fetus. Genetic analyses have identified the Toxoplasma ROP18 Ser/Thr protein kinase as a major factor mediating acute virulence in mice. ROP18 is secreted into the host cell during the invasion process, and its catalytic activity is required for the acute virulence phenotype. However, its precise molecular function and regulation are not fully understood. We have determined the crystal structure of the ROP18 kinase domain, which is inconsistent with a previously proposed autoinhibitory mechanism of regulation. Furthermore, a sucrose molecule bound to our structure identifies an additional ligand-binding pocket outside of the active site cleft. Mutational analysis confirms an important role for this pocket in virulence.
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Affiliation(s)
- Daniel Lim
- From the Department of Biology and
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | | | | | | | | | - Michael B. Yaffe
- From the Department of Biology and
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Camejo A, Gold DA, Lu D, McFetridge K, Julien L, Yang N, Jensen KDC, Saeij JPJ. Identification of three novel Toxoplasma gondii rhoptry proteins. Int J Parasitol 2013; 44:147-60. [PMID: 24070999 DOI: 10.1016/j.ijpara.2013.08.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 08/06/2013] [Accepted: 08/06/2013] [Indexed: 11/29/2022]
Abstract
The rhoptries are key secretory organelles from apicomplexan parasites that contain proteins involved in invasion and modulation of the host cell. Some rhoptry proteins are restricted to the posterior bulb (ROPs) and others to the anterior neck (RONs). As many rhoptry proteins have been shown to be key players in Toxoplasma invasion and virulence, it is important to identify, understand and characterise the biological function of the components of the rhoptries. In this report, we identified putative novel rhoptry genes by identifying Toxoplasma genes with similar cyclical expression profiles as known rhoptry protein encoding genes. Using this approach we identified two new rhoptry bulb (ROP47 and ROP48) and one new rhoptry neck protein (RON12). ROP47 is secreted and traffics to the host cell nucleus, RON12 was not detected at the moving junction during invasion. Deletion of ROP47 or ROP48 in a type II strain did not show major influence in in vitro growth or virulence in mice.
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Affiliation(s)
- Ana Camejo
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Daniel A Gold
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Diana Lu
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Kiva McFetridge
- Department of Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Lindsay Julien
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Ninghan Yang
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Kirk D C Jensen
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Jeroen P J Saeij
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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15
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Abstract
The Dbf4/Drf1-dependent kinase (DDK) is required for the initiation of DNA replication in eukaryotes. Another protein, Claspin, mediates the activation of a cellular checkpoint response to stalled replication forks and is also a regulator of replication. In this study, we found that DDK phosphorylates Claspin in vitro and forms a nuclear complex containing Cdc7, Drf1, and Claspin in Xenopus egg extracts. In addition, purified Claspin and DDK are capable of a direct in vitro interaction. We identified a conserved binding site on Claspin required for its interaction with DDK. This site corresponds to the first of two sequence repeats in the Chk1-binding domain of Claspin. Furthermore, we have established that two amino acids in this motif, Asp(861) and Gln(866), are essential for the interaction between Claspin and DDK. We found that mutant forms of Claspin incapable of interacting with DDK are still able to associate with and activate Chk1 in response to DNA replication blockages. However, Claspin-depleted egg extracts that have been reconstituted with these mutants of Claspin undergo DNA replication more slowly. These findings suggest that the interaction of DDK with Claspin mediates a checkpoint-independent function of Claspin related to DNA replication.
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Affiliation(s)
- Daniel A Gold
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
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16
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Lee J, Gold DA, Shevchenko A, Shevchenko A, Dunphy WG. Roles of replication fork-interacting and Chk1-activating domains from Claspin in a DNA replication checkpoint response. Mol Biol Cell 2005; 16:5269-82. [PMID: 16148040 PMCID: PMC1266425 DOI: 10.1091/mbc.e05-07-0671] [Citation(s) in RCA: 58] [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: 01/05/2023] Open
Abstract
Claspin is essential for the ATR-dependent activation of Chk1 in Xenopus egg extracts containing incompletely replicated DNA. Claspin associates with replication forks upon origin unwinding. We show that Claspin contains a replication fork-interacting domain (RFID, residues 265-605) that associates with Cdc45, DNA polymerase epsilon, replication protein A, and two replication factor C complexes on chromatin. The RFID contains two basic patches (BP1 and BP2) at amino acids 265-331 and 470-600, respectively. Deletion of either BP1 or BP2 compromises optimal binding of Claspin to chromatin. Absence of BP1 has no effect on the ability of Claspin to mediate activation of Chk1. By contrast, removal of BP2 causes a large reduction in the Chk1-activating potency of Claspin. We also find that Claspin contains a small Chk1-activating domain (residues 776-905) that does not bind stably to chromatin, but it is fully effective at high concentrations for mediating activation of Chk1. These results indicate that stable retention of Claspin on chromatin is not necessary for activation of Chk1. Instead, our findings suggest that only transient interaction of Claspin with replication forks potentiates its Chk1-activating function. Another implication of this work is that stable binding of Claspin to chromatin may play a role in other functions besides the activation of Chk1.
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Affiliation(s)
- Joon Lee
- Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA
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17
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Yanow SK, Gold DA, Yoo HY, Dunphy WG. Xenopus Drf1, a regulator of Cdc7, displays checkpoint-dependent accumulation on chromatin during an S-phase arrest. J Biol Chem 2003; 278:41083-92. [PMID: 12897072 DOI: 10.1074/jbc.m307144200] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [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: 12/29/2022] Open
Abstract
We have cloned a Xenopus Dbf4-related factor named Drf1 and characterized this protein by using Xenopus egg extracts. Drf1 forms an active complex with the kinase Cdc7. However, most of the Cdc7 in egg extracts is not associated with Drf1, which raises the possibility that some or all of the remaining Cdc7 is bound to another Dbf4-related protein. Immunodepletion of Drf1 does not prevent DNA replication in egg extracts. Consistent with this observation, Cdc45 can still associate with chromatin in Drf1-depleted extracts, albeit at significantly reduced levels. Nonetheless, Drf1 displays highly regulated binding to replicating chromatin. Treatment of egg extracts with aphidicolin results in a substantial accumulation of Drf1 on chromatin. This accumulation is blocked by addition of caffeine and by immunodepletion of either ATR or Claspin. These observations suggest that the increased binding of Drf1 to aphidicolin-treated chromatin is an active process that is mediated by a caffeine-sensitive checkpoint pathway containing ATR and Claspin. Abrogation of this pathway also leads to a large increase in the binding of Cdc45 to chromatin. This increase is substantially reduced in the absence of Drf1, which suggests that regulation of Drf1 might be involved in the suppression of Cdc45 loading during replication arrest. We also provide evidence that elimination of this checkpoint causes resumed initiation of DNA replication in both Xenopus tissue culture cells and egg extracts. Taken together, these observations argue that Drf1 is regulated by an intra-S-phase checkpoint mechanism that down-regulates the loading of Cdc45 onto chromatin containing DNA replication blocks.
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Affiliation(s)
- Stephanie K Yanow
- Division of Biology, Howard Hughes Medical Institute, California Institute of Technology, Pasadena, California 91125, USA
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18
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Andersen SM, Glassman NS, Gold DA. Mental representations of the self, significant others, and nonsignificant others: structure and processing of private and public aspects. J Pers Soc Psychol 1998; 75:845-61. [PMID: 9825525 DOI: 10.1037/0022-3514.75.4.845] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.0] [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: 11/08/2022]
Abstract
Using prior research on self and social inference (e.g., S. M. Andersen, 1984) and significant-other representations in social perception (S. M. Andersen & S. W. Cole, 1990), the present study examined a dual-factor conceptualization of self-other differences based on perspective differences and emotional-motivational relevance. Both factors were assumed to contribute to how private versus public aspects of the self, significant others, and nonsignificant others are structured in memory. In an idiographic-nomothetic design, participants' response latencies in completing sentences to characterize private and public aspects of each person were measured, and participants rated how well a pooled, randomized set of these predicates described each aspect of each person. Evidence showed differences in featural richness (availability), distinctiveness, and free-retrieval latency (accessibility) supporting the dual-factor conceptualization of self-other differences.
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Affiliation(s)
- S M Andersen
- Department of Psychology, New York University, New York 10003, USA.
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Abstract
Ten knees in nine patients underwent gradual soft tissue expansion prior to major knee surgery. All patients had multiple prior operative procedures around the knee. The resultant multiple skin incisions were felt to potentially jeopardize the postoperative status of the soft tissues. Each knee underwent the surgical placement of a tissue expander through a bed of adjacent healthy soft tissue followed by the gradual inflation of the expander over an average of 64.5 days. The average volume of soft tissue expansion was 313.7 mL per knee. Subsequent major knee surgery requiring an arthrotomy was performed at the time of expander removal followed by uncomplicated soft tissue closure. All wounds healed without any complications.
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Affiliation(s)
- D A Gold
- Insall Scott Kelly Institute for Orthopaedics and Sports Medicine, New York, New York 10128, USA
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Sgaglione NA, Warren RF, Wickiewicz TL, Gold DA, Panariello RA. Primary repair with semitendinosus tendon augmentation of acute anterior cruciate ligament injuries. Am J Sports Med 1990; 18:64-73. [PMID: 2405722 DOI: 10.1177/036354659001800111] [Citation(s) in RCA: 106] [Impact Index Per Article: 3.1] [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: 01/31/2023]
Abstract
A retrospective review of 72 acute ACL injuries in 70 athletically active patients (50 recreational and 20 competitive athletes) treated with primary repair and semitendinosus tendon augmentation was conducted (mean follow-up time, 38.5 months). All patients had open primary multiple loop depth-varying suture repair and semitendinosus tendon augmentation at a mean injury to surgery interval of 9.1 days. Fifty-one cases (70.8%) were supplemented with an extraarticular procedure consisting in all cases of an iliotibial band lateral sling reinforcement. All patients underwent 6 weeks of postoperative immobilization followed by a graduated rehabilitation regimen lasting a mean 7.2 months. In 22 of the ACL tears, no other associated injury could be defined at arthrotomy, while in 27, significant medial collateral ligament injuries were noted. Lateral meniscal injuries (24) were more commonly noted than medial meniscal injuries (19). Good to excellent subjective results were reported in 82%, while 77.1% returned to preinjury sport level and participation without limitation. One patient developed "giving way" symptoms and overall, only four patients did not return to sports participation. Objective examination revealed 93.1% to have a 1+ or less Lachman test and 86.1% to have a negative pivot shift. Of 60 knees tested, 93.3% had KT-1000 side-to-side difference values (measured at 25 degrees +/- 5 degrees of flexion with an 89 N load) of less than or equal to 3 mm of anterior displacement. A 100 point Hospital for Special Surgery ligament rating score was used with 25 points assigned to subjective, 45 points to objective, and 30 points to functional assessment. The mean score at followup was 93.1. Analysis of results in patients with or without an extraarticular reinforcement revealed no difference in objective outcome. The incidence of patellofemoral pain was 27.8%. Thirty knees had some degree of loss of range of motion. Loss of terminal flexion was noted in 29, while 5 had loss of terminal extension. No correlation could be found between patellofemoral pain and diminished range of motion. Generalized ligamentous laxity was found in 37.1% of the patients; this was not associated with a poor result. This study suggests that primary repair with semitendinosus tendon augmentation of acute ACL injuries with a graduated rehabilitation regimen provides good subjective, and excellent functional and objective, results in active patients that were followed for more than 3 years.
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Affiliation(s)
- N A Sgaglione
- Sports Medicine Service, Hospital for Special Surgery, Affiliated with Cornell University Medical College, New York, New York
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Abstract
We have previously demonstrated that estrogen can exert inhibitory or atretogenic effects on the ovaries of both rats and rhesus monkeys in vivo. This study was designed to test whether the hamster (Mesocricetus auratus) is an appropriate model in which to test the effects of estrogens (diethylstilbestrol and estradiol-17 beta) on steroid accumulation by ovarian granulosa cells in vitro, and whether the effects are similar to those demonstrated for other species in vivo. Immature female hamsters were injected with pregnant mare's serum gonadotropin at 28 to 30 days of age. Animals were sacrificed and follicular contents aspirated three days later. Granulosa cells were either left untreated or treated with diethylstilbestrol or estradiol (1 X 10(-7) M) in vitro for 72 h in the presence of androstenedione (1 X 10(-7) M, and in the presence or absence of serum (10%) or human follicle-stimulating hormone (20 ng/ml), and long-term accumulation of estrogen and progesterone was determined. Diethylstilbestrol inhibited accumulation of estrogen regardless of the presence or absence of follicle-stimulating hormone. In contrast, only estradiol plus follicle-stimulating hormone augmented accumulation of progesterone by granulosa cells. These findings that estrogen can be non-stimulatory or inhibitory to function of granulosa cells in vitro parallel those shown in vivo. Our experimental approach may therefore represent an appropriate model for study of the direct effects of estradiol on the function of granulosa cells.
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