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Hensel B, Askins N, Ibarra E, Aristizabal C, Guzman I, Barahona R, Hazelton-Glenn B, Lee J, Zhang Z, Odedina F, Wilkie DJ, Stern MC, Baezconde-Garbanati L, Suther S, Webb F. Florida-California Cancer Health Equity Center (CaRE 2) Community Scientist Research Advocacy Program. J Cancer Educ 2023; 38:1429-1439. [PMID: 37642919 PMCID: PMC10509126 DOI: 10.1007/s13187-023-02351-3] [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] [Subscribe] [Scholar Register] [Accepted: 07/30/2023] [Indexed: 08/31/2023]
Abstract
The Community Scientist Program (CSP), a model connecting researchers with community members, is effective to inform and involve the general population in health-related clinical research. Given the existing cancer disparities among Black/African American and Hispanic/Latino/a populations, more models describing how cancer-related CSPs are designed, implemented, and evaluated are needed. The Florida-California Cancer Research, Education and Engagement (CaRE2) Health Equity Center is a tri-institutional, bicoastal center created to eliminate cancer health disparities among Black/African American and Hispanic/Latino/a populations living in California and in Florida. The CaRE2 Center created a Community Scientist Research Advocacy (CSRA) training program for community members to become cancer research advocates. The CSRA program is currently a 13-week program conducted 100% virtually with all materials provided in English and Spanish for participants to learn more about prostate, lung, and pancreas cancers, ongoing research at CaRE2, and ways to share cancer research throughout their communities. Participants attend didactic lectures on cancer research during weeks 1-5. In week 4, participants join CSRA self-selected groups based on cancer-related topics of interest. Each group presents their cancer-related advocacy project developed during weeks 5-12 at the final session. In this paper, we describe the CaRE2 Health Equity Center's CSRA program, share results, and discuss opportunities for improvement in future program evaluation as well as replication of this model in other communities.
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Affiliation(s)
- B Hensel
- Department of Biobehavioral Nursing Science, University of Florida, Orlando, FL, USA.
| | - N Askins
- Department of Research and Graduate Programs, Florida State University, Orlando, FL, USA
| | - E Ibarra
- Department of Population and Public Health Sciences, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
- USC Norris Comprehensive Cancer Center, Los Angeles, CA, USA
| | - C Aristizabal
- Department of Population and Public Health Sciences, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
- USC Norris Comprehensive Cancer Center, Los Angeles, CA, USA
| | - I Guzman
- Department of Biobehavioral Nursing Science, University of Florida, Orlando, FL, USA
| | - R Barahona
- Department of Population and Public Health Sciences, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
- USC Norris Comprehensive Cancer Center, Los Angeles, CA, USA
| | - B Hazelton-Glenn
- Institute of Public Health, Florida Agricultural and Mechanical University, Tallahassee, FL, USA
| | - J Lee
- Department of Biostatistics, University of Florida, Gainesville, FL, USA
| | - Z Zhang
- Department of Biostatistics, University of Florida, Gainesville, FL, USA
| | - F Odedina
- Mayo Clinic Comprehensive Cancer Center, Jacksonville, FL, USA
| | - D J Wilkie
- Department of Biobehavioral Nursing Science, University of Florida, Gainesville, FL, USA
| | - M C Stern
- Department of Population and Public Health Sciences, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
- USC Norris Comprehensive Cancer Center, Los Angeles, CA, USA
| | - L Baezconde-Garbanati
- Department of Population and Public Health Sciences, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
- USC Norris Comprehensive Cancer Center, Los Angeles, CA, USA
| | - S Suther
- Institute of Public Health, Florida Agricultural and Mechanical University, Tallahassee, FL, USA
| | - F Webb
- Department of Surgery, University of Florida, Jacksonville, FL, USA
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Ciampi E, Soler B, Uribe-San-Martin R, Jürgensen L, Guzman I, Keller K, Reyes A, Bravo-Grau S, Cruz JP, Cárcamo C. Socioeconomic, health-care access and clinical determinants of disease severity in Multiple Sclerosis in Chile. Mult Scler Relat Disord 2023; 78:104918. [PMID: 37562199 DOI: 10.1016/j.msard.2023.104918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/07/2023] [Accepted: 07/24/2023] [Indexed: 08/12/2023]
Abstract
BACKGROUND MS severity may be affected by genetic, patient-related, disease-related and environmental factors. Socioeconomic status, including income and healthcare access, amongst others, may also have a role in affecting diagnostic delay or therapy prescription. In Chile, two main healthcare systems exist, public-healthcare and private-healthcare, nonetheless universal care laws (e.g., access to High Efficacy Therapy-HET), including both systems, have been recently enacted for people with MS. OBJECTIVE To assess the role of Socioeconomic Conditions (SEC), clinical variables and public health policies on the impact of disease severity of MS patients in Chile. METHODS Multicentric, observational, cross-sectional study including patients from two reference centres (1 national reference centre from the private-health system and 1 regional reference centre from the public-health system). SEC and clinical variables included healthcare insurance (private or public), subclassification of health insurance according to monthly income, sex, age at onset, diagnostic delay, disease duration, diagnosis before HET law (as a proxy of HET delay), and current HET treatment. Progression Index (PI), EDSS ≥6.0 and Progressive MS diagnosis were used as outcome measures. Multivariable binary logistic regression was performed. RESULTS We included 604 patients (460 private-health, 144 public-health), 67% women, 100% white/mestizo, 88% RRMS, mean age 42±12 years, mean age at onset 32±11 years, mean disease duration 10±6 years, median diagnostic delay 0 (0-34) years, 86% currently receiving any DMT, 55% currently receiving HET, median EDSS at last visit of 2.0 (0-10), and median PI 0.17 (0-4.5). Lower monthly income was associated with higher EDSS and higher PI. In the multivariable analysis, public-healthcare (OR 10.2), being diagnosed before HET-law (OR 4.89), longer diagnostic delay (OR 1.26), and older age at onset (OR 1.05) were associated with a higher risk of PI>0.2, while current HET (OR 0.39) was a protective factor. Diagnosis before HET-law (OR 7.59), public-healthcare (OR 6.49), male sex (OR 2.56), longer disease duration (OR 1.2) and older age at onset (OR 1.1) were associated with a higher risk of Progressive MS. Public-healthcare (OR 5.54), longer disease duration (OR 1.14) and older age at onset (OR 1.08) were associated with a higher risk of EDSS ≥6.0 while current treatment with HET had a trend as being a protective factor (OR 0.44, p = 0.05). CONCLUSION MS severity is impacted by non-modifiable factors such as sex and age at onset. Interventions focused on shortening diagnostic delay and encouraging early access to high-efficacy therapies, as well as initiatives that may reduce the disparities inherent to lower socioeconomic status, may improve outcomes in people with MS.
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Affiliation(s)
- E Ciampi
- Neurology Department, Pontificia Universidad Católica de Chile, Santiago, Chile; Neurology Service, Hospital Sótero del Río, Santiago, Chile.
| | - B Soler
- Neurology Department, Pontificia Universidad Católica de Chile, Santiago, Chile; Neurology Service, Hospital Sótero del Río, Santiago, Chile
| | - R Uribe-San-Martin
- Neurology Department, Pontificia Universidad Católica de Chile, Santiago, Chile; Neurology Service, Hospital Sótero del Río, Santiago, Chile
| | - L Jürgensen
- Neurology Department, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - I Guzman
- Neurology Department, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - K Keller
- Neurology Department, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - A Reyes
- Neurology Department, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - S Bravo-Grau
- Neurorradiology Department, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - J P Cruz
- Neurorradiology Department, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - C Cárcamo
- Neurology Department, Pontificia Universidad Católica de Chile, Santiago, Chile
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3
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Guzman I, Gomez R. Advantages of using the optic nerve ecography to predict clinical progression in multiple sclerosis. Neurología (English Edition) 2022; 37:73. [DOI: 10.1016/j.nrleng.2021.07.001] [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] [Received: 07/03/2021] [Accepted: 07/07/2021] [Indexed: 10/19/2022] Open
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Guzman I, Gomez R. Advantages of using the optic nerve ecography to predict clinical progression in multiple sclerosis. Neurologia 2022; 37:73. [PMID: 34531046 DOI: 10.1016/j.nrl.2021.07.001] [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: 07/03/2021] [Revised: 07/06/2021] [Accepted: 07/07/2021] [Indexed: 11/19/2022] Open
Affiliation(s)
- I Guzman
- Professional School of Human Medicine, San Juan Bautista Private University, Av. Antonio Lavalle S/N, Chorrillos, Lima 15067, Perú.
| | - R Gomez
- Professional School of Human Medicine, San Juan Bautista Private University, Av. Antonio Lavalle S/N, Chorrillos, Lima 15067, Perú
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Lucero Y, McKenzie C, O'Donnell B, Stanford L, Guzman I. Southern New Mexico Dietary Practices and Carotenoid Content in Traditional Mexican Meals. J Acad Nutr Diet 2019. [DOI: 10.1016/j.jand.2019.06.136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ghaemi Z, Guzman I, Gnutt D, Luthey-Schulten Z, Gruebele M. Role of Electrostatics in Protein-RNA Binding: The Global vs the Local Energy Landscape. J Phys Chem B 2017; 121:8437-8446. [PMID: 28806086 DOI: 10.1021/acs.jpcb.7b04318] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
U1A protein-stem loop 2 RNA association is a basic step in the assembly of the spliceosomal U1 small nuclear ribonucleoprotein. Long-range electrostatic interactions due to the positive charge of U1A are thought to provide high binding affinity for the negatively charged RNA. Short range interactions, such as hydrogen bonds and contacts between RNA bases and protein side chains, favor a specific binding site. Here, we propose that electrostatic interactions are as important as local contacts in biasing the protein-RNA energy landscape toward a specific binding site. We show by using molecular dynamics simulations that deletion of two long-range electrostatic interactions (K22Q and K50Q) leads to mutant-specific alternative RNA bound states. One of these states preserves short-range interactions with aromatic residues in the original binding site, while the other one does not. We test the computational prediction with experimental temperature-jump kinetics using a tryptophan probe in the U1A-RNA binding site. The two mutants show the distinct predicted kinetic behaviors. Thus, the stem loop 2 RNA has multiple binding sites on a rough RNA-protein binding landscape. We speculate that the rough protein-RNA binding landscape, when biased to different local minima by electrostatics, could be one way that protein-RNA interactions evolve toward new binding sites and novel function.
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Affiliation(s)
- Zhaleh Ghaemi
- Department of Chemistry, University of Illinois , Urbana, Illinois 61801, United States
| | - Irisbel Guzman
- Department of Biochemistry, University of Illinois , Urbana, Illinois 61801, United States
| | - David Gnutt
- Department of Chemistry, University of Illinois , Urbana, Illinois 61801, United States
| | - Zaida Luthey-Schulten
- Department of Chemistry, University of Illinois , Urbana, Illinois 61801, United States.,Department of Physics, Center for the Physics of Living Cells, and Center for Biophysics and Quantitative Biology, University of Illinois , Urbana, Illinois 61801, United States.,Beckman Institute, University of Illinois , Urbana, Illinois 61801, United States
| | - Martin Gruebele
- Department of Chemistry, University of Illinois , Urbana, Illinois 61801, United States.,Department of Physics, Center for the Physics of Living Cells, and Center for Biophysics and Quantitative Biology, University of Illinois , Urbana, Illinois 61801, United States
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Davis C, Guzman I, Gnutt D, Gruebele M. Spliceosomal U1A Protein-SL2 RNA Binding Affinity Decreases in Cells. Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.1703] [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: 10/20/2022] Open
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8
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Ghaemi Z, Guzman I, Baek JUJ, Gruebele M, Luthey-Schulten Z. Estimation of Relative Protein–RNA Binding Strengths from Fluctuations in the Bound State. J Chem Theory Comput 2016; 12:4593-9. [DOI: 10.1021/acs.jctc.6b00418] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Zhaleh Ghaemi
- Department of Chemistry, ‡Department of Biochemistry, ¶Department of Physics, §Center for the Physics of Living Cells, and ∥Center for Biophysics
and Quantitative Biology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Irisbel Guzman
- Department of Chemistry, ‡Department of Biochemistry, ¶Department of Physics, §Center for the Physics of Living Cells, and ∥Center for Biophysics
and Quantitative Biology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Jung-un Julia Baek
- Department of Chemistry, ‡Department of Biochemistry, ¶Department of Physics, §Center for the Physics of Living Cells, and ∥Center for Biophysics
and Quantitative Biology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Martin Gruebele
- Department of Chemistry, ‡Department of Biochemistry, ¶Department of Physics, §Center for the Physics of Living Cells, and ∥Center for Biophysics
and Quantitative Biology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Zaida Luthey-Schulten
- Department of Chemistry, ‡Department of Biochemistry, ¶Department of Physics, §Center for the Physics of Living Cells, and ∥Center for Biophysics
and Quantitative Biology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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Tai J, Dave K, Hahn V, Guzman I, Gruebele M. Subcellular modulation of protein VlsE stability and folding kinetics. FEBS Lett 2016; 590:1409-16. [PMID: 27129718 DOI: 10.1002/1873-3468.12193] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [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: 01/01/2016] [Revised: 04/16/2016] [Accepted: 04/19/2016] [Indexed: 01/29/2023]
Abstract
The interior of a cell interacts differently with proteins than a dilute buffer because of a wide variety of macromolecules, chaperones, and osmolytes that crowd and interact with polypeptide chains. We compare folding of fluorescent constructs of protein VlsE among three environments inside cells. The nucleus increases the stability of VlsE relative to the cytoplasm, but slows down folding kinetics. VlsE is also more stable in the endoplasmic reticulum, but unlike PGK, tends to aggregate there. Although fluorescent-tagged VlsE and PGK show opposite stability trends from in vitro to the cytoplasm, their trends from cytoplasm to nucleus are similar.
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Affiliation(s)
- Jonathan Tai
- Department of Biochemistry, University of Illinois, Urbana, IL, USA
| | - Kapil Dave
- Center for Biophysics and Quantitative Biology, University of Illinois, Urbana, IL, USA
| | - Vincent Hahn
- Karlsruher Institut für Technologie, Institut für Angewandte Physik, Karlsruhe, Germany
| | | | - Martin Gruebele
- Center for Biophysics and Quantitative Biology, University of Illinois, Urbana, IL, USA.,Departments of Chemistry and Physics, University of Illinois, Urbana, IL, USA
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Guzman I, Lozada C, Valerio I, Sanchez A, Espinosa R, Lopez A, Martinez K, Fernandez J, Hernandez A, Pabello P. THU0468 Adipokine Serum Levels in Patients with Early Knee Osteoarthritis with Metabolic Syndrome and Healthy Controls. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5380] [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: 11/04/2022]
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Guzman I, Ghaemi Z, Baranger A, Luthey-Schulten Z, Gruebele M. Native Conformational Dynamics of the Spliceosomal U1A Protein. J Phys Chem B 2015; 119:3651-61. [DOI: 10.1021/jp511760m] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
| | | | - Anne Baranger
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
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Ghaemi Z, Guzman I, Gruebele M, Luthey-Schulten Z. Electrostatic Interaction Effects on the Binding of Spliceosomal U1A Protein-SL2 RNA Hairpin. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Affiliation(s)
- Irisbel Guzman
- Department
of Biochemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Martin Gruebele
- Department
of Chemistry, Department of Physics, Center for the Physics of Living
Cells, and Center for Biophysics and Quantitative Biology, University of Illinois, Urbana, Illinois 61801, United States
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14
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Guzman I, Gelman H, Tai J, Gruebele M. The extracellular protein VlsE is destabilized inside cells. J Mol Biol 2013; 426:11-20. [PMID: 24013077 DOI: 10.1016/j.jmb.2013.08.024] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [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: 03/18/2013] [Revised: 08/10/2013] [Accepted: 08/13/2013] [Indexed: 11/25/2022]
Abstract
We use U2OS cells as in vivo "test tubes" to study how the same cytoplasmic environment has opposite effects on the stability of two different proteins. Protein folding stability and kinetics were compared by fast relaxation imaging, which combines a temperature jump with fluorescence microscopy of FRET (Förster resonance energy transfer)-labeled proteins. While the stability of the cytoplasmic enzyme PGK (phosphoglycerate kinase) increases in cells, the stability of the cell surface antigen VlsE, which presumably did not evolve for stability inside cells, decreases. VlsE folding also slows down more than PGK folding in cells, relative to their respective aqueous buffer kinetics. Our FRET measurements provide evidence that VlsE is more compact inside cells than in aqueous buffer. Two kinetically distinct protein populations exist inside cells, making a connection with previous in vitro crowding studies. In addition, we confirm previous studies showing that VlsE is stabilized by 150mg/mL of the carbohydrate crowder Ficoll, even though it is destabilized in the cytoplasm relative to aqueous buffer. We propose two mechanisms for the observed destabilization of VlsE in U2OS cells: long-range interactions competing with crowding or shape-dependent crowding favoring more compact states inside the cell over the elongated aqueous buffer native state.
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Affiliation(s)
- Irisbel Guzman
- Department of Biochemistry, University of Illinois, Urbana, IL 61801, USA
| | - Hannah Gelman
- Department of Physics, University of Illinois, Urbana, IL 61801, USA
| | - Jonathan Tai
- Department of Biochemistry, University of Illinois, Urbana, IL 61801, USA
| | - Martin Gruebele
- Center for Biophysics and Computational Biology, University of Illinois, Urbana, IL 61801, USA; Department of Chemistry, University of Illinois, Urbana, IL 61801, USA; Department of Physics, University of Illinois, Urbana, IL 61801, USA.
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15
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Stepanenko V, De Jesus M, Correa W, Guzman I, Vazquez C, de la Cruz W, Ortiz-Marciales M, Barnes CL. Enantioselective Reduction of Prochiral Ketones using Spiroborate Esters as Catalysts. Tetrahedron Lett 2007; 48:5799-5802. [PMID: 19554205 DOI: 10.1016/j.tetlet.2007.06.086] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Novel spiroborate esters derived nonracemic 1,2-aminoalcohols and ethylene glycol are reported as highly effective catalysts for the asymmetric borane reduction of a variety of prochiral ketones with borane-dimethyl sulfide complex at room temperature. Optically active alcohols were obtained in excellent chemical yields using 0.1 to 10 mol % of catalysts with up to 99% ee.
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Affiliation(s)
- Viatcheslav Stepanenko
- Department of Chemistry, University of Puerto Rico - Humacao, CUH Station, Humacao, Puerto Rico 00791, USA
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Rauch U, Badimon J, Vorchheimer D, Guzman I, Harris K, Harris P, Sandler D, Fallon J, Fuster V, Chosebro J. Lipid lowering therapy reduces blood thrombogenicity in hypercholesterolemic patients: effect of simvastatin. J Am Coll Cardiol 1998. [DOI: 10.1016/s0735-1097(98)81482-4] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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17
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Navot D, Drews MR, Bergh PA, Guzman I, Karstaedt A, Scott RT, Garrisi GJ, Hofmann GE. Age-related decline in female fertility is not due to diminished capacity of the uterus to sustain embryo implantation. Fertil Steril 1994; 61:97-101. [PMID: 8293851 DOI: 10.1016/s0015-0282(16)56459-0] [Citation(s) in RCA: 161] [Impact Index Per Article: 5.4] [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: 01/29/2023]
Abstract
OBJECTIVE To evaluate the contribution of the uterus to age-related reproductive failure in women. PATIENTS Thirty-eight ovum donors (30.2 +/- 4.9 years [mean +/- SD]) donating oocytes throughout 102 ovum donations. Fifty-one cycles were documented in "younger" recipients (35.8 +/- 3.1 years) and 51 in "older" recipients (44.0 +/- 3.1 years). The study was prospectively designed; same-cohort oocytes obtained from one young donor during a specific cycle were evenly distributed between "young" and "old" ovum recipients. Use of oocytes from a single source and a unique ovulatory cohort provides strict control over oocyte quality. Uterine age is varied by design, according to the age of the recipient at the time of ET. The role of the aging uterus in the decline of female fertility can be thus isolated and scrutinized. RESULTS No significant (NS) difference in the number of ova received (7.9 +/- 3.4 versus 7.0 +/- 3.5), ova fertilized (4.4 +/- 1.5 versus 4.5 +/- 2.3), or embryos transferred (4.1 +/- 1.5 versus 4.1 +/- 1.6) was observed between the < 40 and > or = 40 recipient age groups. A total of 23 pregnancies occurred among the 102 ETs (22.6%). Eleven clinical pregnancies (21.6%) resulting in 10 deliveries were observed in the < 40 recipient age group, and 12 clinical pregnancies (23.5%) leading to 10 deliveries occurred in the > or = 40 recipient age group (NS). The pregnancy loss rates were 9.1% (1 of 11) and 16.7% (2 of 12) for the two recipient age groups, respectively, (NS). CONCLUSION The capacity to conceive and to gestate a conception to term when oocyte quality is controlled appears to be independent of uterine aging through the fifth decade of life.
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Affiliation(s)
- D Navot
- Department of Obstetrics, Gynecology and Reproductive Science, Mount Sinai Medical Center, New York, New York
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Hofmann GE, Bentzien F, Bergh PA, Garrisi GJ, Williams MC, Guzman I, Navot D. Premature luteinization in controlled ovarian hyperstimulation has no adverse effect on oocyte and embryo quality. Fertil Steril 1993; 60:675-9. [PMID: 8405524 DOI: 10.1016/s0015-0282(16)56221-9] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.3] [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: 01/30/2023]
Abstract
OBJECTIVE To determine if premature luteinization has an adverse effect on oocyte and, hence, embryo quality. DESIGN Retrospective evaluation of anonymous ovum donors/oocyte recipients. SETTING A large oocyte donation program. PATIENTS, PARTICIPANTS Sixty-eight women undergoing controlled ovarian hyperstimulation (COH) as ovum donors were matched to 68 women with ovarian failure as ovum recipients who had endometrial maturation exogenously controlled by an identical hormone replacement protocol. INTERVENTIONS Serum was collected for E2 and P in donors and recipients. MAIN OUTCOME MEASURES The incidence of premature luteinization was determined in donors. Cycle characteristics were compared between donors with and without premature luteinization, with emphasis on oocyte and embryo quality. Implantation rates per embryo and delivery rates per transfer were measured in recipients. RESULTS Twenty-one (31%) of the donors demonstrated premature luteinization. Serum P was higher on day before hCG, day of hCG, and day after hCG in women demonstrating premature luteinization. However, there were no differences between donor cycles with or without premature luteinization as determined by donor age, ampules of gonadotropins used, day of hCG administration, peak E2, total number of oocytes, and number of mature oocytes retrieved. Ovum recipients were of similar age and had similar E2 exposure (area under the E2 curve) before P administration. Similar fertilization rates, incidence of polyspermia, number of embryos transferred of similar embryo grade, and similar implantation rates and deliveries per transfer were observed in women receiving oocytes from donors with and without premature luteinization, respectively. CONCLUSIONS Similar oocyte quality, fertilization, and polyspermia rates, embryo quality, implantation, and delivery rates suggest that any negative impact of premature luteinization on pregnancy rates in COH cycles from young women is not due to an adverse effect of PL on oocyte and hence embryo quality, but rather on the endometrial environment.
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Affiliation(s)
- G E Hofmann
- Department of Obstetrics and Gynecology, Mount Sinai Medical Center, New York, New York
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Hofmann GE, Bergh PA, Guzman I, Masuku S, Navot D. Premature luteinization is not eliminated by pituitary desensitization with leuprolide acetate in women undergoing gonadotrophin stimulation who demonstrated premature luteinization in a prior gonadotrophin-only cycle. Hum Reprod 1993; 8:695-8. [PMID: 8314961 DOI: 10.1093/oxfordjournals.humrep.a138122] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [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: 01/29/2023] Open
Abstract
A total of 40 women who demonstrated premature luteinization (serum progesterone > or = 3.5 nmol/l (1.1 ng/ml) on or before the day of human chorionic gonadotrophin (HCG) administration) during ovarian stimulation with human menopausal gonadotrophins (HMG) were restimulated in 46 subsequent cycles after pituitary desensitization with the gonadotrophin-releasing hormone agonist (GnRHa, 1 mg), leuprolide acetate. Five women were treated with a double dose of agonist (2 mg) when premature luteinization was determined on the single dose protocol. In HMG-only cycles, a frank luteinizing hormone (LH) surge was detected in 30 cycles; 15 cycles were cancelled because of premature ovulation. In agonist cycles there were no cancellations, although 25 cycles demonstrated premature luteinization and in six cycles a frank LH surge was detected. Doubling the dose of the agonist did not prevent premature luteinization. Agonist cycles with and without premature luteinization did not differ in any in-vitro fertilization (IVF) outcome parameters (ampoules of gonadotrophins, day of HCG administration, peak oestradiol concentration, number of oocytes retrieved, fertilized, transferred or cryopreserved). We conclude that in patients who demonstrate premature luteinization in a gonadotrophin-only cycle, pituitary desensitization may not completely eliminate subtle luteinization or a frank LH surge.
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Affiliation(s)
- G E Hofmann
- Mount Sinai Medical Center, Department of Obstetrics and Gynecology and Reproductive Sciences, New York, NY 10029
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Vazquez-Levin M, Kaplan P, Guzman I, Grunfeld L, Garrisi GJ, Navot D. The effect of female antisperm antibodies on in vitro fertilization, early embryonic development, and pregnancy outcome. Fertil Steril 1991; 56:84-8. [PMID: 2065807 DOI: 10.1016/s0015-0282(16)54422-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [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: 12/30/2022]
Abstract
STUDY OBJECTIVE To evaluate the extent to which human in vitro fertilization-embryo transfer (IVF-ET) alleviates immunological infertility. DESIGN Retrospective. SETTING In vitro fertilization program. PATIENTS Thirty-three patients with positive antisperm antibodies undergoing 50 cycles of IVF-ET in which maternal serum was replaced by 5 mg/mL of bovine serum albumin (BSA) comprised the study group. Seventy-one patients with tubal infertility served as controls. In 50 of these, medium was supplemented with 7.5% maternal serum, and 21 were assigned to BSA substitution. RESULTS Percentage of fertilization in the study group was significantly lower (41 +/- 31; mean +/- SD) than that of controls with maternal serum (77 +/- 15) and BSA (76 +/- 22). Early embryonic quality, as assessed by percentage of cleavage and morphological grading, was found to be inferior in patients with antisperm antibodies. The percentage of advanced embryos (greater than or equal to 4 blastomeres) at the time of transfer was 42 +/- 39 in the study group, compared with 65 +/- 23 and 75 +/- 35 for maternal serum and BSA controls, respectively. Percentage of morphologically favorable embryos (grades 1 and 2 in a 1 to 5 grading system) was 49 +/- 31 in the study group, compared with 78 +/- 35 and 74 +/- 23 for the controls. Percentage of clinical pregnancy was somewhat lower in the study group (12.5%) than in controls with either maternal serum (18%) or BSA (19%). CONCLUSIONS Antisperm antibodies may have an adverse effect on fertilization and early embryonic development. Female immunological infertility may not be completely alleviated by IVF-ET.
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Affiliation(s)
- M Vazquez-Levin
- Department of Obstetrics, Gynecology, and Reproductive Science, Mount Sinai Medical Center, New York City, New York
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Navot D, Bergh PA, Williams MA, Garrisi GJ, Guzman I, Sandler B, Grunfeld L. Poor oocyte quality rather than implantation failure as a cause of age-related decline in female fertility. Lancet 1991; 337:1375-7. [PMID: 1674764 DOI: 10.1016/0140-6736(91)93060-m] [Citation(s) in RCA: 345] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Female fertility declines with advancing age. To establish whether this age-related reproductive failure results from diminished oocyte quality or uterine/endometrial inadequacy we investigated ovum donation in 35 infertile women, aged 40 years or older (mean 42.7 [SE 0.3]) who had failed at attempts at conception with their own (self) oocytes. Oocytes were donated by 29 young individuals (mean age 33.4 [0.7]) undergoing in-vitro fertilisation (IVF). 8 (5.3%) pregnancies were achieved in 150 cycles of ovulation induction with self-oocytes and 2 (3.3%) in 60 such cycles by in-vitro fertilisation (IVF), but none attained viability. By contrast in 50 cycles with donated oocytes 28 (56%) pregnancies and 15 (30%) deliveries were realised (p less than 0.005). The rate of implantation per embryo transferred was higher (14.7%) with donated oocytes than that with self-oocytes (3.3%) (p less than 0.01). To further elucidate the contribution of age to reproductive outcome, pregnancy results were compared between the young donors and older recipients. Both donors and recipients shared oocytes from the same induced cohort. Rates for clinical pregnancy and delivery did not differ between donors (33% and 23%) and recipients (40% and 30%). Our data suggest that the age-related decline in female fertility is attributable to oocyte quality and is correctable by ovum donation. The uterus can adequately sustain pregnancies even when reproductive potential is artificially prolonged into the late 40s.
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Affiliation(s)
- D Navot
- Department of Obstetrics, Gynecology, and Reproductive Science, Mount Sinai Medical Center, New York, NY 10029
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Navot D, Bergh PA, Williams M, Garrisi GJ, Guzman I, Sandler B, Fox J, Schreiner-Engel P, Hofmann GE, Grunfeld L. An insight into early reproductive processes through the in vivo model of ovum donation. J Clin Endocrinol Metab 1991; 72:408-14. [PMID: 1991811 DOI: 10.1210/jcem-72-2-408] [Citation(s) in RCA: 155] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To gain insight into early reproductive processes we have prospectively designed ovum donation protocols to elucidate several phenomena relating to embryo implantation and pregnancy sustenance. Artificial endometrial cycles with variable follicular phases were induced in 60 recipients by sequential estrogen and progesterone. A total of 964 oocytes were retrieved throughout 43 ovum donation attempts, for an average of 22.4 (range, 16-41) eggs/retrieval. The overall delivery rate per egg retrieval (donors and recipients combined) was 72.1% (31 of 43). The shortest estrogen stimulation (short follicular phase) resulting in ongoing pregnancies was 5 days in duration, while the longest (long follicular phase) was 35 days in duration before progesterone initiation. Utilization of variable length follicular phases, artificially extended the stage of endometrial receptivity to over 4 weeks. To assess the window of implantation, same age embryos were transferred onto endometrium of different maturational stages. Pregnancies were documented with embryo transfers between luteal day 1 (day 15) to luteal day 6 (day 20), extending the window of implantation in the human to at least 6 consecutive days. To evaluate the relative contribution of oocyte quality and endometrial receptivity to pregnancy outcome, common source ova were transferred onto endometrium with variable hormonal exposure. Despite the drastically different follicular phase estradiol levels and periods of exposure, similar delivery rates were attained in donor cycles (29.4%) and recipient cycles during short follicular phases (29.6%). Slightly higher delivery rates (39.4%) were observed with long follicular phases. The comparable pregnancy rates in donors and recipients are attributed to the common source oocytes regardless of endometrial stimulation.
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Affiliation(s)
- D Navot
- Department of Obstetrics, Gynecology, Mount Sinai Medical Center, New York, New York 10029
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Castellanos J, Toledo-Pereyra LH, Mittal VK, Guzman I, Lillehei RC. Prolonged hypocholesteremic effect of portacaval transposition in dogs. An experimental study. Eur Surg Res 1981; 13:438-43. [PMID: 7040084 DOI: 10.1159/000128212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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]
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