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Kumar S, King E, Binns HJ, Christison A, Cuda SE, Yee JK, Joseph M, Kirk S. Diabetes screening outcomes in youth presenting for paediatric weight management: A report of the Paediatric Obesity Weight Evaluation Registry. Pediatr Obes 2024; 19:e13102. [PMID: 38296252 DOI: 10.1111/ijpo.13102] [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: 09/16/2023] [Revised: 12/13/2023] [Accepted: 01/04/2024] [Indexed: 03/09/2024]
Abstract
OBJECTIVE Rising prevalence of obesity has led to increased rates of prediabetes and diabetes mellitus (DM) in children. This study compares rates of prediabetes and diabetes using two recommended screening tests (fasting plasma glucose [FPG] and haemoglobin A1c [HbA1c]). STUDY DESIGN Data were collected prospectively from 37 multi-component paediatric weight management programs in POWER (Paediatric Obesity Weight Evaluation Registry). RESULTS For this study, 3962 children with obesity without a known diagnosis of DM at presentation and for whom concurrent measurement of FPG and HbA1c were available were evaluated (median age 12.0 years [interquartile range, IQR 9.8, 14.6]; 48% males; median body mass index 95th percentile [%BMIp95] 134% [IQR 120, 151]). Notably, 10.7% had prediabetes based on FPG criteria (100-125 mg/dL), 18.6% had prediabetes based on HbA1c criteria (5.7%-6.4%), 0.9% had DM by FPG abnormality (≥126 mg/dL) and 1.1% had DM by HbA1c abnormality (≥6.5%). Discordance between the tests was observed for youth in both age groups (10-18 years [n = 2915] and age 2-9 years [n = 1047]). CONCLUSION There is discordance between FPG and HbA1c for the diagnosis of prediabetes and DM in youth with obesity. Further studies are needed to understand the predictive capability of these tests for development of DM (in those diagnosed with prediabetes) and cardiometabolic risk.
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Affiliation(s)
- Seema Kumar
- Division of Pediatric Endocrinology and Metabolism, Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Eileen King
- Division of Biostatistics and Epidemiology, Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
- Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA
| | - Helen J Binns
- Pediatrics, Ann & Robert H. Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Amy Christison
- Pediatrics, University of Illinois College of Medicine at Peoria, Peoria, Illinois, USA
| | - Suzanne E Cuda
- Alamo City Healthy Kids and Families, San Antonio, Texas, USA
| | - Jennifer K Yee
- Division of Pediatric Endocrinology, Harbor-UCLA Medical Center and The Lundquist Institute of Biomedical Innovation at Harbor-UCLA, Torrance, California, USA
| | - Madeline Joseph
- College of Medicine, University of Florida, Jacksonville, Florida, United States
| | - Shelley Kirk
- Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA
- Center for Better Health and Nutrition, The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
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2
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Yee JK, Mao CS. Care of Transgender and Gender-Diverse Children and Adolescents. Adv Pediatr 2023; 70:187-198. [PMID: 37422296 DOI: 10.1016/j.yapd.2023.04.006] [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] [Indexed: 07/10/2023]
Abstract
Children and adolescents may present with transgender or gender diverse (TGD) identity during the course of development. Pediatricians may be the first health care providers to whom TGD identity is revealed. Pediatricians can optimize health care outcomes by promoting a gender-affirming clinical environment, initiating the evaluation for gender incongruence, supporting social transition, and initiating medical interventions. Clinical practice guidelines are available from the World Professional Association for Transgender Health (WPATH, Standards of Care, version 8, 2022) and the Endocrine Society (2017). This article outlines a general approach to providing social and medical affirming care from the pediatrician's office.
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Affiliation(s)
- Jennifer K Yee
- Division of Endocrinology, Department of Pediatrics, Harbor-UCLA Medical Center, David Geffen School of Medicine at University of California, Los Angeles; The Lundquist Institute of Biomedical Innovation at Harbor-UCLA Medical Center, 1000 West Carson Street, Harbor Box 446, Torrance, CA 90509, USA.
| | - Catherine S Mao
- Division of Endocrinology, Department of Pediatrics, Harbor-UCLA Medical Center, David Geffen School of Medicine at University of California, Los Angeles; The Lundquist Institute of Biomedical Innovation at Harbor-UCLA Medical Center, 1000 West Carson Street, Harbor Box 446, Torrance, CA 90509, USA
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3
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Kim GK, Yee JK, Bansal N. Algorithms for Treating Dyslipidemia in Youth. Curr Atheroscler Rep 2023; 25:495-507. [PMID: 37523052 DOI: 10.1007/s11883-023-01122-1] [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] [Subscribe] [Scholar Register] [Accepted: 06/16/2023] [Indexed: 08/01/2023]
Abstract
PURPOSE OF REVIEW The goal of this article is to review algorithms for treating dyslipidemia in youth, discuss pitfalls, propose enhanced algorithms to address pitfalls, and consider future directions. RECENT FINDINGS The presence of modifiable and non-modifiable cardiovascular disease (CVD) risk factors during childhood is associated with CVD-related events in adulthood. Recent data has shown that childhood initiation of statin therapy in youth < 18 years of age with familial hypercholesterolemia reduces the risk of adult CVD. However, pediatric dyslipidemia remains undertreated in part due to a lack of primary health care providers with adequate understanding of screening guidelines and pediatric lipidologists with experience in treatment and follow-up of this unique population. Management algorithms have been published by the National Heart, Lung, and Blood Institute and American Heart Association as tools to empower clinicians to manage dyslipidemia. We propose enhanced algorithms, which incorporate recently approved pharmacotherapy to address the management gaps. Future algorithms based upon clinical risk scores may enhance treatment and improve outcomes. Algorithms for dyslipidemia management which target youth < 18 years of age are tools which empower clinicians to manage dyslipidemia in this unique population. Enhanced algorithms may help address pitfalls. We acknowledge the need for further risk assessment tools in pediatrics for tailored dyslipidemia management.
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Affiliation(s)
- Grace K Kim
- Division of Diabetes and Endocrinology, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, 6701 Fannin St. Ste 1020, Houston, TX, 77030, USA
| | - Jennifer K Yee
- Division of Endocrinology, Department of Pediatrics, Harbor-UCLA Medical Center, The Lundquist Institute of Biomedical Innovation at Harbor-UCLA, Torrance, CA, 90509, USA
- David Geffen School of Medicine at UCLA, Los Angeles, CA, 90509, USA
| | - Nidhi Bansal
- Division of Diabetes and Endocrinology, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, 6701 Fannin St. Ste 1020, Houston, TX, 77030, USA.
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4
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Vidmar AP, Salvy SJ, Wee CP, Pretlow R, Fox DS, Yee JK, Garell C, Glasner S, Mittelman SD. An addiction-based digital weight loss intervention: A multi-centre randomized controlled trial. Pediatr Obes 2023; 18:e12990. [PMID: 36484235 PMCID: PMC9905275 DOI: 10.1111/ijpo.12990] [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: 07/18/2022] [Revised: 10/07/2022] [Accepted: 11/02/2022] [Indexed: 12/13/2022]
Abstract
OBJECTIVE This randomized clinical trial tested the effectiveness of an addiction-based digital weight-loss intervention, focusing on withdrawal/abstinence from self-identified problem foods, snacking and excessive amounts at meals, and discomfort displacement, with and without coaching, compared to an in-person, multi-disciplinary, care model among adolescents with obesity. We hypothesized that the digital intervention with coaching would yield greater weight loss and lower delivery burden than the standard clinical arm, and greater participant engagement than the digital arm without coaching. METHODS Adolescents were randomized to app intervention, with or without coaching, or in-person multidisciplinary obesity intervention for 6 months. The primary outcome was change in %BMIp95 at weeks 12 and 24. A mixed-effects linear regression model was used to assess the association between change in %BMIp95 and intervention arm. We were also interested in assessing delivery burden, participant engagement and evaluating the relationships between weight change and demographic characteristics, mood, executive function and eating behaviours. RESULTS All adolescents (n = 161; BMI ≥95th%, age 16 ± 2.5 year; 47% Hispanic, 65% female, 59% publicly insured) lost weight over 24-weeks (-1.29%, [-1.82, -0.76], p < 0.0001), with no significant weight loss difference between groups (p = 0.3). Girls lost more weight than boys, whereas binge eating behaviour at baseline was associated with increase in %BMIp95 when controlling for other covariates. There was no association between ethnicity, mood, timing of intervention in relation to the pandemic, or executive function and change in %BMIp95 . CONCLUSIONS Contrary with our hypothesis, our results showed no difference in the change in BMI status between treatment arms. Since efficacy of this digital intervention was not inferior to in-person, multi-disciplinary care, this could offer a reasonable weight management option for clinicians, based on youth and family specific characteristics, such as accessibility, resources, and communication styles. CLINICAL TRIAL REGISTRATION ClinicalTrials.gov identifier: NCT035008353.
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Affiliation(s)
- Alaina P. Vidmar
- Department of Pediatrics, Center for Endocrinology, Diabetes and Metabolism, Children’s Hospital Los Angeles and Keck School of Medicine of USC, Los Angeles, California, USA
| | - Sarah J. Salvy
- Department of Medicine, Cedars-Sinai Medical Center, Research Center for Health Equity Samuel Oschin Comprehensive Cancer Institute, Los Angeles, California, USA
| | - Choo Phei Wee
- Department of Population and Public Health Sciences, Keck School of Medicine of USC, Southern California Clinical Science Institute, Los Angeles, California, USA
| | | | - D. Steven Fox
- Department of Pharmaceutical and Health Economics, School of Pharmacy of the University of Southern California, Los Angeles, California, USA
| | - Jennifer K. Yee
- Division of Pediatric Endocrinology, Harbor-UCLA Medical Center, Harbor-UCLA Medical Center, Torrance, California, United States
| | - Cambria Garell
- Department of Pediatrics, Division of General Pediatrics, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Suzette Glasner
- Department of Psychiatry & Biobehavioral Sciences, University of California, Los Angeles, California, USA
| | - Steven D. Mittelman
- Department of Pediatrics, Division of General Pediatrics, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
- Department of Pediatrics, Division of Endocrinology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
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Grace B, Taylor Lucas C, Shetgiri R, Cardenas K, Perez de la Garza G, Pak Y, Yee JK. Physical Activity Counseling and Documentation by Pediatric Residents in Primary Care: Before and After Introduction of the FITT Principle. Clin Pediatr (Phila) 2022; 62:449-455. [PMID: 35978477 PMCID: PMC9935740 DOI: 10.1177/00099228221115989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Physician training on physical activity (PA) counseling in patient care is highly variable. The objective of this study was to improve PA counseling by pediatric residents through introduction of the four components of PA, called the FITT principle (frequency, intensity, time, type). Pediatric residents (n=30) received lectures, curriculum content, and an electronic smart-phrase addressing PA in obesity, including the FITT principle. Surveys assessed resident attitudes, and chart reviews (n = 423 over 16 months) identified evidence of PA counseling including FITT principle components preintervention and postintervention. Survey results showed positive attitudes and confidence regarding primary care provider roles in counseling on PA, with no differences postintervention. Chart reviews demonstrated increased documentation on PA frequency postintervention (pre 31.9% vs post 50.9%, P=.00006), but no significant changes in intensity, time or type. In conclusion, a focused PA curriculum promoted PA counseling by pediatric residents, with increased documentation of one component of the FITT principle.
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Affiliation(s)
- Benjamin Grace
- Department of Pediatrics, Division of Endocrinology, The Lundquist Institute of Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - Candice Taylor Lucas
- Department of Pediatrics, University of California, Irvine, School of Medicine, Orange, CA, USA
| | - Rashmi Shetgiri
- Office of Health Assessment and Epidemiology, Los Angeles County Department of Public Health, Los Angeles, CA, USA
| | - Krystal Cardenas
- Department of Pediatrics, Division of Endocrinology, The Lundquist Institute of Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - Giselle Perez de la Garza
- Department of Pediatrics, Division of Endocrinology, The Lundquist Institute of Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - Youngju Pak
- Department of Internal Medicine, Division of Endocrinology, The Lundquist Institute of Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - Jennifer K. Yee
- Department of Pediatrics, Division of Endocrinology, The Lundquist Institute of Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA, USA,Corresponding author: Jenifer K Yee, MD, The Lundquist Institute of Biomedical Innovation at Harbor-UCLA Medical Center, 1124 W Carson St, Torrance, CA 90502, USA, Phone: 310-222-1971, Fax: 424-571-7642,
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6
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Abstract
PURPOSE OF REVIEW Lifestyle modification is additive to lipid-lowering medications in the treatment of heterozygous familial hypercholesterolemia (HeFH), which does not respond sufficiently to statin therapy. While both are also important in homozygous familial hypercholesterolemia (HoFH), additional measures such as apheresis may be needed. The purpose of this review is to identify non-statin medications to lower cholesterol that are available for children and adolescents as adjunctive therapy. RECENT FINDINGS Ezetimibe is commonly used as second-line pharmacotherapy for treatment of HeFH and HoFH. Colesevelam, a bile acid sequestrant, may be considered for adjunct therapy. Since 2015, the PCSK9 inhibitor evolocumab has been available for adolescents, and its FDA approval has now expanded to age 10 years. The ANGPTL3 inhibitor evinacumab has been approved for children age 12 years and older. A clinical trial for lomitapide is in progress. Approvals for PCSK9 and ANGPTL3 inhibitors have expanded opportunities for children and adolescents with HeFH and HoFH to achieve lower LDL-C levels.
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Affiliation(s)
- Waleed Z Butt
- Division of Endocrinology, Department of Internal Medicine, Harbor-UCLA Medical Center, 1000 W. Carson Street, Harbor Box 446, Torrance, CA, 90509, USA.,The Lundquist Institute of Biomedical Innovation at Harbor, UCLA Medical Center, 1124 W. Carson Street, Martin Building, Torrance, CA, 90502, USA
| | - Jennifer K Yee
- The Lundquist Institute of Biomedical Innovation at Harbor, UCLA Medical Center, 1124 W. Carson Street, Martin Building, Torrance, CA, 90502, USA. .,Division of Endocrinology, Department of Pediatrics, Harbor-UCLA Medical Center, 1000 W. Carson Street, Harbor Box 446, Torrance, CA, 90509, USA.
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7
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Skinner AC, Xu H, Christison A, Neshteruk C, Cuda S, Santos M, Yee JK, Thomas L, King E, Kirk S. Patient Retention in Pediatric Weight Management Programs in the United States: Analyses of Data from the Pediatrics Obesity Weight Evaluation Registry. Child Obes 2022; 18:31-40. [PMID: 34415779 DOI: 10.1089/chi.2021.0092] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Objective: Meeting recommended provider contact hours in multicomponent pediatric weight management (PWM) programs is difficult when patient retention is low. Our objective was to examine associations between individual patient characteristics, program characteristics, and patient retention. Methods: Using the Pediatric Obesity Weight Evaluation Registry, a prospective longitudinal study of 32 PWM programs, we included children (≤18 years; n = 6502) enrolled for a full year. We examined associations between retention (any follow-up visit) and patient and program characteristics using multivariable models with site-clustering random effects. Results: Sixty-seven percent of children had at least one follow-up visit, whereas 12% had four or more visits. Compared with non-Hispanic white children, non-Hispanic black children were less likely to have a follow-up visit [adjusted odds ratio (aOR) = 0.79], whereas Hispanic children (any race) were more likely (aOR = 1.22). Children with Medicaid had similar retention to those with private insurance. Retention did not differ by age, gender, weight status, or comorbidities, nor by program characteristics. Conclusions: Few characteristics of PWM programs are clearly associated with retention, indicating that a variety of formats can support continued treatment and likely reflect the influence of unmeasured characteristics. Clearer ways to identify and overcome barriers for individual patients will be needed to improve retention in PWM.
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Affiliation(s)
- Asheley Cockrell Skinner
- Department of Population Health Sciences, Duke University, Durham, NC, USA.,Duke Clinical Research Institute, Duke University, Durham, NC, USA
| | - Haolin Xu
- Duke Clinical Research Institute, Duke University, Durham, NC, USA
| | - Amy Christison
- Department of Pediatrics, University of Illinois College of Medicine at Peoria, Peoria, IL, USA
| | - Cody Neshteruk
- Department of Population Health Sciences, Duke University, Durham, NC, USA.,Duke Clinical Research Institute, Duke University, Durham, NC, USA
| | - Suzanne Cuda
- Department of Pediatrics, Baylor College of Medicine, Children's Hospital of San Antonio, San Antonio, TX, USA
| | - Melissa Santos
- Pediatric Obesity Center, Connecticut Children's, Hartford, CT, USA
| | - Jennifer K Yee
- Department of Pediatrics, Harbor-UCLA Medical Center, Torrance, CA, USA
| | - Laine Thomas
- Duke Clinical Research Institute, Duke University, Durham, NC, USA.,Department of Biostatistics and Bioinformatics, Duke University, Durham, NC, USA
| | - Eileen King
- Division of Biostatistics and Epidemiology, The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Shelley Kirk
- Department of Pediatrics, The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA
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8
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Sakai-Bizmark R, Mena LA, Estevez D, Webber EJ, Marr EH, Bedel LE, Yee JK. Erratum. Health Care Utilization of Homeless Minors With Diabetes in New York State From 2009 to 2014. Diabetes Care 2020;43:2082-2089. Diabetes Care 2021; 44:1070. [PMID: 33504497 PMCID: PMC8291347 DOI: 10.2337/dc21-er04] [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] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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9
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Borzutzky C, King E, Fox CK, Stratbucker W, Tucker J, Yee JK, Kumar S, Cuda S, Sweeney B, Kirk S, On Behalf Of The Power Work Group. Trends in prescribing anti-obesity pharmacotherapy for paediatric weight management: Data from the POWER Work Group. Pediatr Obes 2021; 16:e12701. [PMID: 32877010 DOI: 10.1111/ijpo.12701] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 06/11/2020] [Accepted: 06/20/2020] [Indexed: 01/04/2023]
Abstract
INTRODUCTION To better inform the field of obesity medicine, we set out to describe the current use of pharmacotherapy meant to improve patient weight status among a group of clinicians connected through the Paediatric Obesity Weight Evaluation Registry (POWER), as well as reasons behind clinicians' use or non-use of the medications. METHODS Paediatric weight management (PWM) programs participating in POWER were asked to complete a program profile survey in 2014 (n = 30) and 2017 (n = 33); questions about pharmacotherapy use were included. Descriptive statistics were used to identify: (a) the proportion of PWM programs offering obesity pharmacotherapy; (b) the medications most commonly prescribed; and (c) reasons among non-prescribers for not offering pharmacotherapy. RESULTS The 2014 and 2017 surveys were completed by 29 PWM programs (97%) and 30 PWM programs (91%), respectively. Twenty-one programs completed both surveys. In 2014, 10 (34%) programs reported offering pharmacologic agents specifically for weight control, whereas in 2017, 16 (53%) reported offering pharmacotherapy for a primary indication of weight loss. Metformin was reported as the most commonly used agent in 2014, and topiramate in 2017. Largest reported increases in use over time were for topiramate and phentermine. DISCUSSION Our survey results demonstrate that a majority of this group of PWM programs offered pharmacotherapy to promote weight loss in patients with complications or associated medical conditions. There was a trend indicating increasing use over time, despite the significant gap regarding pharmacotherapy use in the literature. CONCLUSIONS These data suggest the need for (a) additional robust paediatric drug trials to further develop the evidence base guiding use or non-use of pharmacotherapy in paediatric weight management, and (b) increased understanding of both facilitators and barriers to prescribing anti-obesity pharmacotherapy for youth with obesity.
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Affiliation(s)
- Claudia Borzutzky
- Division of Adolescent and Young Adult Medicine, Department of Pediatrics, Children's Hospital Los Angeles and Keck School of Medicine of USC, Los Angeles, California, USA
| | - Eileen King
- Division of Biostatistics and Epidemiology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.,Department of Pediatrics, University of Cincinnati, College of Medicine, Cincinnati, Ohio, USA
| | - Claudia K Fox
- Center for Pediatric Obesity Medicine, Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota, USA
| | - William Stratbucker
- Healthy Weight Center, Helen DeVos Children's Hospital, Grand Rapids, Michigan, USA.,Michigan State University College of Human Medicine, Grand Rapids, Michigan, USA
| | - Jared Tucker
- Healthy Weight Center, Helen DeVos Children's Hospital, Grand Rapids, Michigan, USA.,Michigan State University College of Human Medicine, Grand Rapids, Michigan, USA
| | - Jennifer K Yee
- Division of Endocrinology, Department of Pediatrics, Harbor-UCLA Medical Center, Torrance, California, USA.,The Lundquist Institute for Biomedical Innovation at Harbor-UCLA, Torrance, California, USA
| | - Seema Kumar
- Division of Pediatric Endocrinology, Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Suzanne Cuda
- Division of Adolescent Medicine, Department of Pediatrics, Children's Hospital of San Antonio, Baylor College of Medicine, San Antonio, Texas, USA
| | - Brooke Sweeney
- General Academic Pediatrics, Children's Mercy Kansas City, Kansas City, Missouri, USA.,University of Missouri Kansas City, Kansas City, Missouri, USA.,Children's Center for Healthy Lifestyles & Nutrition, Kansas City, Missouri, USA
| | - Shelley Kirk
- Department of Pediatrics, University of Cincinnati, College of Medicine, Cincinnati, Ohio, USA.,The Heart Institute, Center for Better Health and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
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10
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Sakai-Bizmark R, Mena LA, Estevez D, Webber EJ, Marr EH, Bedel LEM, Yee JK. Health Care Utilization of Homeless Minors With Diabetes in New York State From 2009 to 2014. Diabetes Care 2020; 43:2082-2089. [PMID: 32616618 PMCID: PMC7646203 DOI: 10.2337/dc19-2219] [Citation(s) in RCA: 4] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 05/14/2020] [Indexed: 02/03/2023]
Abstract
OBJECTIVE This study aims to describe differences in health care utilization between homeless and nonhomeless minors with diabetes. RESEARCH DESIGN AND METHODS Data from the Healthcare Cost and Utilization Project's Statewide Inpatient Database from New York for years 2009-2014 were examined to identify pediatric patients <18 years old with diabetes. Outcomes of interest included hospitalization rate, in-hospital mortality, admission through the emergency department (ED), diabetic ketoacidosis (DKA), hospitalization cost, and length of stay (LOS). Other variables of interest included age-group, race/ethnicity, insurance type, and year. Multivariate logistic regression models were used for in-hospital mortality, admission through ED, and DKA. Log-transformed linear regression models were used for hospitalization cost, and negative binomial regression models were used for LOS. RESULTS A total of 643 homeless and 10,559 nonhomeless patients were identified. The hospitalization rate was higher among homeless minors, with 3.64 per 1,000 homeless population compared with 0.38 per 1,000 in the nonhomeless population. A statistically significant higher readmission rate was detected among homeless minors (20.4% among homeless and 14.1% among nonhomeless, P < 0.01). Lower rates of DKA (odds ratio 0.75, P = 0.02), lower hospitalization costs (point estimate 0.88, P < 0.01), and longer LOS (incidence rate ratio 1.20, P < 0.01) were detected among homeless minors compared with nonhomeless minors. CONCLUSIONS This study found that among minors with diabetes, those who are homeless experience a higher hospitalization rate than the nonhomeless. Housing instability, among other environmental factors, may be targeted for intervention to improve health outcomes.
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Affiliation(s)
- Rie Sakai-Bizmark
- The Lundquist Institute for Biomedical Innovation, Torrance, CA .,Department of Pediatrics, Harbor-UCLA Medical Center and David Geffen School of Medicine, University of California, Los Angeles, Torrance, CA
| | - Laurie A Mena
- The Lundquist Institute for Biomedical Innovation, Torrance, CA
| | - Dennys Estevez
- The Lundquist Institute for Biomedical Innovation, Torrance, CA
| | - Eliza J Webber
- The Lundquist Institute for Biomedical Innovation, Torrance, CA
| | - Emily H Marr
- The Lundquist Institute for Biomedical Innovation, Torrance, CA
| | | | - Jennifer K Yee
- The Lundquist Institute for Biomedical Innovation, Torrance, CA.,Department of Pediatrics, Harbor-UCLA Medical Center and David Geffen School of Medicine, University of California, Los Angeles, Torrance, CA
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11
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Ferber C, Mao CS, Yee JK. Type 1 Diabetes in Youth and Technology-Based Advances in Management. Adv Pediatr 2020; 67:73-91. [PMID: 32591065 DOI: 10.1016/j.yapd.2020.04.002] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Christopher Ferber
- Department of Pediatrics, Harbor-UCLA Medical Center, 1000 West Carson Street, Harbor Box 446, Torrance, CA 90509, USA
| | - Catherine S Mao
- Division of Endocrinology, Department of Pediatrics, David Geffen School of Medicine at UCLA, Harbor-UCLA Medical Center, 1000 West Carson Street, Harbor Box 446, Torrance, CA 90509, USA; The Lundquist Institute of Biomedical Innvoation at Harbor-UCLA, 1124 West Carson Street, Torrance, CA 90502, USA
| | - Jennifer K Yee
- Division of Endocrinology, Department of Pediatrics, David Geffen School of Medicine at UCLA, Harbor-UCLA Medical Center, 1000 West Carson Street, Harbor Box 446, Torrance, CA 90509, USA; The Lundquist Institute of Biomedical Innvoation at Harbor-UCLA, 1124 West Carson Street, Torrance, CA 90502, USA.
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12
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Le SQ, Nestrasil I, Kan SH, Egeland M, Cooper JD, Elashoff D, Guo R, Tolar J, Yee JK, Dickson PI. Myelin and Lipid Composition of the Corpus Callosum in Mucopolysaccharidosis Type I Mice. Lipids 2020; 55:627-637. [PMID: 32537944 DOI: 10.1002/lipd.12261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 09/30/2019] [Revised: 05/08/2020] [Accepted: 05/13/2020] [Indexed: 01/28/2023]
Abstract
Mucopolysaccharidosis type I (MPS I) is a lysosomal disease with progressive central nervous system involvement. This study examined the lipid, cholesterol, and myelin basic protein composition of white matter in the corpus callosum of MPS I mice. We studied 50 week-old, male MPS I mice and littermate, heterozygote controls (n = 12 per group). Male MPS I mice showed lower phosphatidylcholine and ether-linked phosphatidylcholine quantities than controls (p < 0.05). Twenty-two phospholipid or ceramide species showed significant differences in percent of total. Regarding specific lipid species, MPS I mice exhibited lower quantities of sphingomyelin 18:1, phosphatidylserine 38:3, and hexosylceramide d18:1(22:1) mH2 O than controls. Principal components analyses of polar, ceramide, and hexosylceramide lipids, respectively, showed some separation of MPS I and control mice. We found no significant differences in myelin gene expression, myelin basic protein, or total cholesterol in the MPS I mice versus heterozygous controls. There was a trend toward lower proteolipid protein-1 levels in MPS I mice (p = 0.06). MPS I mice show subtle changes in white matter composition, with an unknown impact on pathogenesis in this model.
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Affiliation(s)
- Steven Q Le
- Department of Pediatrics, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA, 90502, USA.,Department of Pediatrics, Washington University School of Medicine, 660 S. Euclid, Saint Louis, MO, 63110, USA
| | - Igor Nestrasil
- Department of Pediatrics, University of Minnesota, 2450 Riverside Avenue, Minneapolis, MN, 55454, USA
| | - Shih-Hsin Kan
- Department of Pediatrics, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA, 90502, USA.,CHOC Children's Research Institute, 2450 Riverside Avenue, Orange, CA, 55454, USA
| | - Martin Egeland
- Department of Pediatrics, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA, 90502, USA
| | - Jonathan D Cooper
- Department of Pediatrics, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA, 90502, USA.,Department of Pediatrics, Washington University School of Medicine, 660 S. Euclid, Saint Louis, MO, 63110, USA
| | - David Elashoff
- Department of Medicine Statistics Core, University of California, 100 Medical Plaza Driveway, Los Angeles, CA, 90095, USA
| | - Rong Guo
- Department of Medicine Statistics Core, University of California, 100 Medical Plaza Driveway, Los Angeles, CA, 90095, USA
| | - Jakub Tolar
- Department of Pediatrics, University of Minnesota, 2450 Riverside Avenue, Minneapolis, MN, 55454, USA.,Stem Cell Institute, University of Minnesota, 2001 6th Street SE, Minneapolis, MN, 55455, USA
| | - Jennifer K Yee
- Department of Pediatrics, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA, 90502, USA
| | - Patricia I Dickson
- Department of Pediatrics, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA, 90502, USA.,Department of Pediatrics, Washington University School of Medicine, 660 S. Euclid, Saint Louis, MO, 63110, USA
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13
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Gross AC, Kaizer AM, Kelly AS, Rudser KD, Ryder JR, Borzutzky CR, Santos M, Tucker JM, Yee JK, Fox CK. Long and Short of It: Early Response Predicts Longer-Term Outcomes in Pediatric Weight Management. Obesity (Silver Spring) 2019; 27:272-279. [PMID: 30677263 PMCID: PMC6352906 DOI: 10.1002/oby.22367] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 10/17/2018] [Indexed: 11/29/2022]
Abstract
OBJECTIVE This study aimed to examine whether 1-month BMI improvement is predictive of superior 6- and 12-month BMI changes in a national sample of youth in pediatric weight management treatment. METHODS Participants were 4- to 18-year-olds from the Pediatric Obesity Weight Evaluation Registry, a prospective study collecting data from 31 pediatric weight management programs across the United States. Response at 1 month was defined as ≥ 3% BMI reduction; success at 6 and 12 months was defined as ≥ 5% BMI reduction from baseline. Analyses used linear and logistic regression with robust variance estimation. RESULTS Primary analyses were completed with 687 participants (mean age 12.2 years). One-month responders demonstrated significant improvements in BMI compared with nonresponders at 6 months (BMI, -2.05 vs. 0.05; %BMI, -5.81 vs. 0.23; P < 0.001 for all) and 12 months (BMI, -1.87 vs. 0.30; %BMI, -5.04 vs. 1.06; P < 0.001 for all). The odds of success for 1-month responders were 9.64 (95% CI: 5.85-15.87; P < 0.001) times that of nonresponders at 6 months and 5.24 (95% CI: 2.49-11.02; P < 0.001) times that of nonresponders at 12 months. CONCLUSIONS In treatment-seeking youth with obesity, early BMI reduction was significantly associated with greater long-term BMI reduction. Nonresponders may benefit from early treatment redirection or intensification.
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Affiliation(s)
- Amy C Gross
- Department of Pediatrics, University of Minnesota Medical School, Minneapolis, Minnesota, USA
- Center for Pediatric Obesity Medicine, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Alexander M Kaizer
- Center for Pediatric Obesity Medicine, University of Minnesota Medical School, Minneapolis, Minnesota, USA
- Department of Biostatistics and Informatics, Colorado School of Public Health, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Aaron S Kelly
- Department of Pediatrics, University of Minnesota Medical School, Minneapolis, Minnesota, USA
- Center for Pediatric Obesity Medicine, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Kyle D Rudser
- Center for Pediatric Obesity Medicine, University of Minnesota Medical School, Minneapolis, Minnesota, USA
- Division of Biostatistics, University of Minnesota School of Public Health, Minneapolis, Minnesota, USA
| | - Justin R Ryder
- Department of Pediatrics, University of Minnesota Medical School, Minneapolis, Minnesota, USA
- Center for Pediatric Obesity Medicine, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Claudia R Borzutzky
- Department of Pediatrics, Keck School of Medicine of USC, Diabetes and Obesity Program, Children's Hospital Los Angeles, Los Angeles, California, USA
| | - Melissa Santos
- The Pediatric Obesity Center, Connecticut Children's Medical Center, Hartford, Connecticut, USA
| | - Jared M Tucker
- Helen DeVos Children's Hospital, Grand Rapids, Michigan, USA
- Department of Pediatrics and Human Development, Michigan State University, Grand Rapids, Michigan, USA
| | - Jennifer K Yee
- Department of Pediatrics, Division of Endocrinology, Harbor-UCLA Medical Center, The Los Angeles Biomedical Research Institute at Harbor-UCLA, Torrance, California, USA
| | - Claudia K Fox
- Department of Pediatrics, University of Minnesota Medical School, Minneapolis, Minnesota, USA
- Center for Pediatric Obesity Medicine, University of Minnesota Medical School, Minneapolis, Minnesota, USA
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14
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Yee JK, Lucas-Wright A, Liu PY, Chung B, Bross R, Malkhassian S, Norris KC, Wang C, Jones L. Initiating Dialogue in Community-Partnered Participatory Research to Address Obesity in South Los Angeles. J Health Care Poor Underserved 2018; 29:601-614. [PMID: 29805126 DOI: 10.1353/hpu.2018.0044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In South Los Angeles, a community-engaged research project on obesity was initiated between a translational research institute seeking to build community-based or partnered participatory research (CBPR/CPPR) capacity, and a community partner with extensive experience. This manuscript describes the partnership-building process and discusses results from a bi-directional knowledge transfer event.
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15
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Jia Y, Yee JK, Wang C, Nikolaenko L, Diaz-Arjonilla M, Cohen JN, French SW, Liu PY, Lue Y, Lee WNP, Swerdloff RS. Testosterone protects high-fat/low-carbohydrate diet-induced nonalcoholic fatty liver disease in castrated male rats mainly via modulating endoplasmic reticulum stress. Am J Physiol Endocrinol Metab 2018; 314:E366-E376. [PMID: 28928235 PMCID: PMC5966753 DOI: 10.1152/ajpendo.00124.2017] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [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] [Indexed: 02/08/2023]
Abstract
We previously showed that testosterone (T) deficiency enhanced high-fat/low-carbohydrate diet (HFD)-induced hepatic steatosis in rats independent of insulin resistance and that T replacement reduced hepatic macrovesicular fat accumulation and inflammation. The present report explores the mechanism of T's protective effects on HFD-induced steatohepatitis. Adult male rats were randomized into four treatment groups for 15 wk: intact rats on regular chow diet or HFD, and castrated rats on HFD with or without T replacement. Fatty acid β-oxidation and de novo synthesis were not changed by castration and T replacement, but expression of lipid export proteins ApoB100 and microsomal triglyceride transfer protein (MTP) was suppressed by HFD in both intact and castrated rats but restored by T replacement. Macrovesicular lipid droplet-related proteins perilipin 1 and fat-specific protein 27 were increased by HFD in castrated rats and suppressed by T replacement. Higher activation/expression of ER stress proteins (PERK, IRE-1α, JNK, NF-κB, and CHOP) was demonstrated in castrated rats fed HFD compared with intact animals, and T replacement suppressed these changes. We conclude that 1) HFD leads to ApoB100/MTP suppression reducing export of lipids; 2) castration promotes progression to steatohepatitis through activation of the ER stress pathway and enhancement of macrovesicular droplet protein expression; and 3) testosterone suppresses ER stress, inhibits the formation of macrovesicular lipid droplets, promotes lipid export, and ameliorates steatohepatitis induced by HFD and castration.
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Affiliation(s)
- Yue Jia
- Division of Endocrinology, Department of Medicine, Harbor-University of California, Los Angeles (UCLA), Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - Jennifer K Yee
- Department and Endocrinology, Department of Pediatrics, Harbor-UCLA Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - Christina Wang
- Division of Endocrinology, Department of Medicine, Harbor-University of California, Los Angeles (UCLA), Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - Liana Nikolaenko
- Division of Endocrinology, Department of Medicine, Harbor-University of California, Los Angeles (UCLA), Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - Maruja Diaz-Arjonilla
- Division of Endocrinology, Department of Medicine, Harbor-University of California, Los Angeles (UCLA), Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - Joshua N Cohen
- Department and Endocrinology, Department of Pediatrics, Harbor-UCLA Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - Samuel W French
- Department of Pathology, Harbor-UCLA Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - Peter Y Liu
- Division of Endocrinology, Department of Medicine, Harbor-University of California, Los Angeles (UCLA), Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - YanHe Lue
- Division of Endocrinology, Department of Medicine, Harbor-University of California, Los Angeles (UCLA), Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - Wai-Nang P Lee
- Department and Endocrinology, Department of Pediatrics, Harbor-UCLA Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
| | - Ronald S Swerdloff
- Division of Endocrinology, Department of Medicine, Harbor-University of California, Los Angeles (UCLA), Medical Center , Torrance, California
- Department of Pathology, Harbor-UCLA Medical Center , Torrance, California
- Los Angeles Biomedical Research Institute , Torrance, California
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16
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Mokhtari S, Grace B, Pak Y, Reina A, Durand Q, Yee JK. Motivation and perceived competence for healthy eating and exercise among overweight/obese adolescents in comparison to normal weight adolescents. BMC Obes 2017; 4:36. [PMID: 29177057 PMCID: PMC5693573 DOI: 10.1186/s40608-017-0172-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 11/10/2017] [Indexed: 11/14/2022]
Abstract
Background The current literature on determinants of behavior change in weight management lacks sufficient studies on type of motivation among children/adolescents, on perceived competence, and in relation to healthy eating. This study aimed to investigate type of motivation and levels of perceived competence for healthy diet and exercise, as well as general self efficacy among adolescents. We hypothesized that overweight/obese adolescents would demonstrate lower autonomous motivation and perceived competence regarding diet and exercise, and lower self-efficacy in general, and that the scores would be influenced by socioeconomic factors. Methods Normal weight (n = 40, body mass index < 85% for age and gender) and overweight or obese adolescents (n = 60, body mass index ≥ 85% for age and gender) aged 13-18 years were recruited from pediatric ambulatory clinics. Information was collected about demographics, socioeconomic factors, and lifestyle behaviors. The study subjects completed a survey including the Treatment Self-Regulation Questionnaire (TSRQ) and the Perceived Competence Scale (PCS) for healthy eating and exercise, and the General Self-Efficacy Scale (GSES). Composite scores for the three scales were compared between the two groups using the using the two-sample t-test (for normal data) or the Mann-Whitney U test (for non-parametric data). Relationships between the composite scores and patient characteristics were determined using Pearson or Spearman’s correlations. Results The average age of the total cohort was 15.9 ± 1.9 years. 54% were female, and 82% identified as Latino/Hispanic. In comparison to normal weight subjects, overweight/obese adolescents exhibited higher scores for controlled motivation (mean ± standard deviation 28.3 ± 9.3 vs 18.1 ± 8.1) and higher perceived competence [median and 25-75% interquartile range 22.5 (19.0-26.0) vs 20.0 (15.5-25.0)] in relation to eating a healthy diet. These differences persisted after adjustment for age, sex, paternal education, and family income. Conclusions Overweight/obese adolescents did not lack autonomous motivation but demonstrated higher controlled motivation and perceived competence for healthy eating in comparison to normal weight adolescents, independent of socioeconomic factors. In the clinical practice of weight management, providers should carefully assess adolescents for type of motivation and perceived competence, while accounting for potential barriers to behavior change.
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Affiliation(s)
- Suzanne Mokhtari
- Department of Pediatrics, Division of Hospital Medicine, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA USA
| | - Benjamin Grace
- Department of Pediatrics, Division of Pediatric Endocrinology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA USA
| | - Youngju Pak
- Department of Medicine, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA USA
| | - Astrid Reina
- Department of Psychiatry, Division of Psychology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA USA
| | - Quinn Durand
- Department of Psychiatry, Division of Psychology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA USA
| | - Jennifer K Yee
- Department of Pediatrics, Division of Pediatric Endocrinology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 W. Carson Street, Torrance, CA USA
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17
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Provenzale JM, Nestrasil I, Chen S, Kan SH, Le SQ, Jens JK, Snella EM, Vondrak KN, Yee JK, Vite CH, Elashoff D, Duan L, Wang RY, Ellinwood NM, Guzman MA, Shapiro EG, Dickson PI. Diffusion tensor imaging and myelin composition analysis reveal abnormal myelination in corpus callosum of canine mucopolysaccharidosis I. Exp Neurol 2015. [PMID: 26222335 DOI: 10.1016/j.expneurol.2015.07.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Children with mucopolysaccharidosis I (MPS I) develop hyperintense white matter foci on T2-weighted brain magnetic resonance (MR) imaging that are associated clinically with cognitive impairment. We report here a diffusion tensor imaging (DTI) and tissue evaluation of white matter in a canine model of MPS I. We found that two DTI parameters, fractional anisotropy (a measure of white matter integrity) and radial diffusivity (which reflects degree of myelination) were abnormal in the corpus callosum of MPS I dogs compared to carrier controls. Tissue studies of the corpus callosum showed reduced expression of myelin-related genes and an abnormal composition of myelin in MPS I dogs. We treated MPS I dogs with recombinant alpha-L-iduronidase, which is the enzyme that is deficient in MPS I disease. The recombinant alpha-L-iduronidase was administered by intrathecal injection into the cisterna magna. Treated dogs showed partial correction of corpus callosum myelination. Our findings suggest that abnormal myelination occurs in the canine MPS I brain, that it may underlie clinically-relevant brain imaging findings in human MPS I patients, and that it may respond to treatment.
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Affiliation(s)
- James M Provenzale
- Duke University, Department of Radiology, Durham, NC, USA; Emory University, Department of Radiology, Oncology & Biomedical Engineering, Atlanta, GA, USA
| | - Igor Nestrasil
- University of Minnesota, Department of Pediatrics, Minneapolis, MN, USA
| | - Steven Chen
- Duke University, Department of Radiology, Durham, NC, USA
| | - Shih-Hsin Kan
- Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Department of Pediatrics, Torrance, CA, USA
| | - Steven Q Le
- Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Department of Pediatrics, Torrance, CA, USA
| | | | | | - Kristen N Vondrak
- Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Department of Pediatrics, Torrance, CA, USA
| | - Jennifer K Yee
- Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Department of Pediatrics, Torrance, CA, USA
| | - Charles H Vite
- University of Pennsylvania School of Veterinary Medicine, Department of Clinical Studies, Philadelphia, PA, USA
| | - David Elashoff
- University of California, Los Angeles, Departments of Medicine and Biostatistics, Los Angeles, CA, USA
| | - Lewei Duan
- University of California, Los Angeles, Departments of Medicine and Biostatistics, Los Angeles, CA, USA
| | | | | | - Miguel A Guzman
- Saint Louis University School of Medicine, Department of Pathology, Saint Louis, MO, USA
| | - Elsa G Shapiro
- University of Minnesota, Department of Pediatrics, Minneapolis, MN, USA
| | - Patricia I Dickson
- Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Department of Pediatrics, Torrance, CA, USA.
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18
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Abstract
Lactate dehydrogenase A (LDHA) is the enzyme that converts pyruvate to lactate and oxidizes the reduced form of nicotinamide adenine dinucleotide (NADH) to NAD+. Several human cancers including the pancreas display elevated expression of LDHA. Because of its essential role in cancer metabolism, LDHA has been considered to be a potential target for cancer therapy. Recently, we have shown that a green tea extract significantly down-regulated LDHA in HPAF-II pancreatic cancer cells using global proteomics profiling. The present study is to investigate how EGCG, a major biological active constituent of green tea, targets the metabolism of human pancreatic adenocarcinoma MIA PaCa-2 cells. We compared the effect of EGCG to that of oxamate, an inhibitor of LDHA, on the multiple metabolic pathways as measured by extracellular lactate production, glucose consumption, as well as intracellular aspartate and glutamate production, fatty acid synthesis, acetyl-CoA, RNA ribose and deoxyribose. Specific metabolic pathways were studied using [1, 2-13C2]-d-glucose as the single precursor metabolic tracer. Isotope incorporations in metabolites were analyzed using gas chromatography/mass spectrometry (GC/MS) and stable isotope-based dynamic metabolic profiling (SiDMAP). We found that the EGCG treatment of MIA PaCa-2 cells significantly reduced lactate production, anaerobic glycolysis, glucose consumption and glycolytic rate that are comparable to the inhibition of LDHA by oxamate treatment. Significant changes in intracellular glucose carbon re-distribution among major glucose-utilizing macromolecule biosynthesis pathways in response to EGCG and oxamate treatment were observed. The inhibition of LDHA by EGCG or oxamate impacts on various pathways of the cellular metabolic network and significantly modifies the cancer metabolic phenotype. These results suggest that phytochemical EGCG and LDHA inhibitor oxamate confer their anti-cancer activities by disrupting the balance of flux throughout the cellular metabolic network.
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Affiliation(s)
- Qing-Yi Lu
- Department of Medicine, University of California, Los Angeles, CA, USA
| | - Lifeng Zhang
- Department of Medicine, University of California, Los Angeles, CA, USA
| | - Jennifer K Yee
- Department of Pediatrics, Los Angeles Biomedical Research Institute, Torrance, CA, USA
| | - Vay-Liang W Go
- Department of Medicine, University of California, Los Angeles, CA, USA
| | - Wai-Nang Lee
- Department of Pediatrics, Los Angeles Biomedical Research Institute, Torrance, CA, USA
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19
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Yee JK, Mao CS, Ross MG, Paul Lee WN, Desai M, Toda A, Kjos SL, Hicks RA, Patterson ME. High oleic/stearic fatty-acid desaturation index in cord plasma from infants of mothers with gestational diabetes. J Perinatol 2014; 34:357-63. [PMID: 24577432 PMCID: PMC4022182 DOI: 10.1038/jp.2014.23] [Citation(s) in RCA: 16] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Revised: 11/25/2013] [Accepted: 01/06/2014] [Indexed: 12/27/2022]
Abstract
OBJECTIVE Enhanced fatty-acid desaturation by stearoyl-CoA desaturase enzyme-1 (SCD1) is associated with obesity. This study determined desaturation in the cord plasma of newborns of mothers with and without gestational diabetes (GDM). STUDY DESIGN Newborns of mothers with GDM (n=21) and without (control, n=22) were recruited. Cord plasma fatty-acid desaturation indices (palmitoleic/palmitic, oleic/stearic ratios) were compared, and correlated with anthropometrics and biochemical measures. A subset of very low-density lipoprotein (VLDL) desaturation indices were determined to approximate the liver SCD1 activity. RESULT The total oleic/stearic index was higher in GDM, despite adjustment for cord glucose concentrations. Among GDM and controls, the oleic/stearic index correlated with cord glucose concentrations (rs=0.36, P=0.02). Both palmitoleic/palmitic and oleic/stearic indices correlated with waist circumference (r=0.47, P=0.001; r=0.37, P=0.01). The VLDL oleic/stearic index was higher in GDM. CONCLUSION The elevated total oleic/stearic index suggests increased lipogenesis in GDM newborns. Factors in addition to glucose supply may influence fetal SCD1 activity.
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Affiliation(s)
- Jennifer K. Yee
- Department of Pediatrics, Division of Endocrinology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center
| | - Catherine S. Mao
- Department of Pediatrics, Division of Endocrinology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center
| | - Michael G. Ross
- Department of Obstetrics and Gynecology, Los Angeles Biomedical Research at Harbor-UCLA Medical Center
| | - W. N. Paul Lee
- Department of Pediatrics, Division of Endocrinology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center
| | - Mina Desai
- Department of Obstetrics and Gynecology, Los Angeles Biomedical Research at Harbor-UCLA Medical Center
| | - Audrey Toda
- Department of Obstetrics and Gynecology, Los Angeles Biomedical Research at Harbor-UCLA Medical Center
| | - Siri L. Kjos
- Department of Obstetrics and Gynecology, Los Angeles Biomedical Research at Harbor-UCLA Medical Center
| | - Rebecca A. Hicks
- Department of Pediatrics, Division of Endocrinology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center
| | - Mary E. Patterson
- Department of Pediatrics, Division of Endocrinology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center
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20
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Abstract
Precursor-to-product ratios in steroid hormone metabolism may accurately reflect enzymatic activity and production of metabolites relative to their disappearance. The purpose of this study was to explore the use of direct precursor-to-product steroid ratios to discriminate between infants with congenital adrenal hyperplasia (CAH) due to 21- α -hydroxylase deficiency and infants with no disorder, thus characterizing the biochemical phenotype in CAH. Deidentified dried blood spot samples from confirmed CAH cases identified by newborn screen (CAH-positive, N = 8) and from cases with no disorder (CAH-negative, N = 10) were obtained from the California State Newborn Screening Program. Samples (∼6.25 mm circular spots) underwent methanol and water extraction (9:1 ratio). Deuterated steroids served as isotope internal standards. 17-α-hydroxyprogesterone (17-OHP), 11-deoxycortisol (S), androstenedione (A4) and cortisol (F) concentrations were determined by liquid chromatography-tandem mass spectrometry (LC-MS/MS), and the 17-OHP/S, 17-OHP/A4, and S/F ratios were calculated. The mean 17-OHP and A4 concentrations in samples from CAH cases were significantly increased when compared to cases with no disorder (p = 0.003 for both). 17-OHP/S and 17-OHP/A4 ratios were also significantly elevated in CAH cases (p = 0.007 and p < 0.001, respectively). In contrast, S and F concentrations and the S/F ratio were similar between the two groups. In CAH, the elevated 17-OHP/S ratio is a biomarker of diminished 21-α-hydroxylase activity, and the elevated 17-OHP/A4 ratio is a biomarker of adrenal androgen excess via increased 17,20-lyase activity. The similar S/F ratio indicates that the rate of production via 11-β-hydroxylase and disappearance of F is maintained in CAH.
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Affiliation(s)
- Rebecca A. Hicks
- Division of Endocrinology, Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 West Carson Street, Bldg RB-1, Box 446, Torrance, CA 90502, USA
| | - Jennifer K. Yee
- Division of Endocrinology, Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 West Carson Street, Bldg RB-1, Box 446, Torrance, CA 90502, USA
| | - Catherine S. Mao
- Division of Endocrinology, Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 West Carson Street, Bldg RB-1, Box 446, Torrance, CA 90502, USA
| | - Steve Graham
- Genetic Disease Screening Program, California Department of Public Health, 850 Marina Bay Parkway, Richmond, CA 94804, USA
| | - Martin Kharrazi
- Genetic Disease Screening Program, California Department of Public Health, 850 Marina Bay Parkway, Richmond, CA 94804, USA
| | - Fred Lorey
- Genetic Disease Screening Program, California Department of Public Health, 850 Marina Bay Parkway, Richmond, CA 94804, USA
| | - W. P. Lee
- Division of Endocrinology, Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 West Carson Street, Bldg RB-1, Box 446, Torrance, CA 90502, USA
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21
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Nikolaenko L, Jia Y, Wang C, Diaz-Arjonilla M, Yee JK, French SW, Liu PY, Laurel S, Chong C, Lee K, Lue Y, Lee WNP, Swerdloff RS. Testosterone replacement ameliorates nonalcoholic fatty liver disease in castrated male rats. Endocrinology 2014; 155:417-28. [PMID: 24280056 PMCID: PMC5393315 DOI: 10.1210/en.2013-1648] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Nonalcoholic fatty liver disease is common in developed countries and is associated with obesity, metabolic syndrome, and type 2 diabetes. T deficiency is a risk factor for developing these metabolic deficiencies, but its role in hepatic steatosis has not been well studied. We investigated the effects of T on the pathogenesis of hepatic steatosis in rats fed a high-fat diet (HFD). Adult male rats were randomly placed into four groups and treated for 15 weeks: intact rats on regular chow diet (RCD), intact rats on liquid HFD (I+HFD), castrated rats on HFD (C+HFD), and castrated rats with T replacement on HFD (C+HFD+T). Fat contributed 71% energy to the HFD but only 16% of energy to the RCD. Serum T level was undetectable in castrated rats, and T replacement led to 2-fold higher mean serum T levels than in intact rats. C+HFD rats gained less weight but had higher percentage body fat than C+HFD+T. Severe micro- and macrovesicular fat accumulated in hepatocytes with multiple inflammatory foci in the livers of C+HFD. I+HFD and C+HFD+T hepatocytes demonstrated only mild to moderate microvesicular steatosis. T replacement attenuated HFD-induced hepatocyte apoptosis in castrated rats. Serum glucose and insulin levels were not increased with HFD in any group. Immunoblots showed that insulin-regulated proteins were not changed in any group. This study demonstrates that T deficiency may contribute to the severity of hepatic steatosis and T may play a protective role in hepatic steatosis and nonalcoholic fatty liver disease development without insulin resistance.
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Affiliation(s)
- L Nikolaenko
- Divisions of Endocrinology, Departments of Medicine (L.N., Y.J., C.W., M.D.-A., P.Y.L., S.L., C.C., K.L., Y.L., R.S.S.) and Pediatrics (J.K.Y., W.N.P.L.), and Department of Pathology (S.W.F.) Harbor-UCLA Medical Center and Los Angeles Biomedical Research Institute, Torrance, California 90509
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Yee JK, Wahjudi PN, Vega J, Lim S, Martin A, Patterson ME, Cohen JN, Mao CS, Lee WNP. Stearoyl-CoA desaturase enzyme 1 inhibition reduces glucose utilization for de novo fatty acid synthesis and cell proliferation in 3T3-L1 adipocytes. Metabolomics 2013; 9:809-816. [PMID: 24039619 PMCID: PMC3769228 DOI: 10.1007/s11306-013-0511-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Stearoyl-CoA desaturase enzyme 1 (SCD1) is a lipogenic enzyme that is upregulated in obesity, insulin resistance, and cancer. Since glucose is a substrate for both de novo fatty acid synthesis and deoxyribose synthesis, we hypothesized that SCD1 affects these multiple synthetic pathways through changes in glucose utilization. This study determined glucose utilization for fatty acid synthesis and cell proliferation in 3T3-L1 preadipocytes during SCD1 inhibition. The effects of SCD1 on cellular metabolism as mediated by its monounstaurated fatty acid products (palmitoleate and oleate) were also observed. 3T3-L1 preadipocytes underwent differentiation induction in conjunction with one of the following treatments for 4 days: (A) no treatment, (B) SCD1 inhibitor CGX0290, (C) CGX0290 + palmitoleate, or (D) CGX0290 + oleate. All cells received medium with 50 % [U13C]-glucose. Cells were harvested on day 7 for studies of fatty acid metabolism, tricarboxylic acid (TCA) cycle activities, and deoxyribose synthesis. CGX0290 decreased fatty acid desaturation, glucose utilization for fatty acid synthesis (acetyl-CoA enrichment), and de novo synthesis. CGX0290 treatment also led to decreased cell density through increased cell death. Further analysis showed that deoxyribose new synthesis and oxidative pentose phosphate pathway activity were unchanged, while non-oxidative transketolase pathway activity was stimulated. Palmitoleate and oleate supplementation each partially ameliorated the effects of CGX0290. In 3T3-L1 cells, SCD1 promotes glucose utilization for fatty acid synthesis. In cell proliferation, SCD1 may promote cell survival, but does not impact the oxidative pathway of deoxyribose production. These effects may be mediated through the production of palmitoleate and oleate.
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Patterson ME, Mao CS, Yeh MW, Ipp E, Cortina G, Barank D, Vasinrapee P, Pawlikowska-Haddal A, Lee WNP, Yee JK. Hyperinsulinism presenting in childhood and treatment by conservative pancreatectomy. Endocr Pract 2012; 18:e52-6. [PMID: 22548943 DOI: 10.4158/ep11232.cr] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 11/15/2022]
Abstract
OBJECTIVE To describe the uncommon presentation of hyperinsulinism in an 8-year-old boy. METHODS We describe the patient's clinical findings, results from biochemical and imaging studies, surgical approach, and outcome. The discussion encompasses a review of literature that provided the basis for the diagnostic and surgical approach applied to this patient's case. RESULTS An obese 8.5-year-old boy initially presented with hypoglycemic seizures after initiation of dietary changes to treat obesity. Biochemical analysis indicated hyperinsulinism. Endoscopic ultrasonography showed no pancreatic lesions suggestive of insulinoma. Genetic studies identified no known mutations in the ABCC8, KCNJ11, GCK, or GLUD1 genes. Selective arterial calcium stimulation and hepatic venous sampling did not document a focal source for hyperinsulinism in the pancreas, and positron emission tomography with 18-fluoro-L-3,4-dihydroxyphenylalanine showed diffusely increased uptake in the pancreas. The patient ultimately required partial pancreatectomy because of continued hypoglycemia while taking diazoxide and octreotide. Intraoperative glucose monitoring directed the extent of surgical resection. A 45% pancreatectomy was performed, which resolved the hypoglycemia but led to impaired glucose tolerance after surgery. CONCLUSION The unusual presentation of hyperinsulinism in childhood required a personalized approach to diagnosis and surgical management using intraoperative glucose monitoring that resulted in a conservative pancreatectomy.
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Affiliation(s)
- Mary E Patterson
- Department of Pediatrics, Harbor-UCLA Medical Center, Torrance, California 90509, USA
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Yee JK, Lee WNP, Ross MG, Lane RH, Han G, Vega J, Desai M. Peroxisome proliferator-activated receptor gamma modulation and lipogenic response in adipocytes of small-for-gestational age offspring. Nutr Metab (Lond) 2012; 9:62. [PMID: 22726273 PMCID: PMC3495639 DOI: 10.1186/1743-7075-9-62] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 06/14/2012] [Indexed: 01/30/2023] Open
Abstract
Background Small-for-gestational age (SGA) at birth increases risk of development of adult obesity and insulin resistance. A model of SGA rat offspring has been shown to exhibit increased adipose tissue expression of a key adipogenic transcription factor, peroxisome proliferator-activated receptor gamma (PPARγ), and increased fatty acid de novo synthesis during the nursing period, prior to onset of obesity. PPARγ agonists have been studied for potential use in the prevention of insulin resistance. Moreover, SGA adipocytes exhibit age-dependent differences in lipogenesis as mediated by PPARγ. The effects of PPARγ modulators on lipogenic gene expression and de novo lipogenesis on the age-dependent changes in SGA adipocytes are not known. The objectives of this study were: 1) to determine the adipogenic and lipogenic potential in SGA adipocytes at postnatal day 1 (p1) and day 21 (p21), 2) to determine how the PPARγ activator- and repressor-ligands affect the lipogenic potential, and 3) to determine the fatty acid metabolic response to PPARγ activator-ligand treatment. Methods Primary adipocyte cultures from p1 and p21 SGA and Control male offspring were established from a known maternal food-restriction model of SGA. Cell proliferation and Oil Red O (ORO) staining were quantified. Adipocytes were treated with increasing doses of rosiglitazone or bisphenol-A diglycidyl ether (BADGE). PPARγ and SREBP1 protein expression were determined. De novo lipogenesis with rosiglitazone treatment at p21 was studied using 50% U13C-glucose and gas chromatography/mass spectrometry. Results At p1 and p21, SGA demonstrated increased cell proliferation and increased ORO staining. At p21, SGA demonstrated increased lipogenic gene expression and increased glucose-mediated fatty acid de novo synthesis compared with Controls. In response to rosiglitazone, SGA adipocytes further increased glucose utilization for fatty acid synthesis. SGA lipogenic gene expression demonstrated resistance to BADGE treatment. Conclusions SGA adipocytes exhibit an enhanced adipogenic and lipogenic potential in early postnatal life. By p21, SGA demonstrated resistance to PPARγ repressor-ligand treatment, and selective response to high dose PPARγ activator-ligand treatment in adipogenic and lipogenic gene expression. p21 SGA adipocytes revealed increased fatty acid de novo synthesis through a complex relationship with glucose metabolism.
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Affiliation(s)
- Jennifer K Yee
- Department of Pediatrics, Division of Endocrinology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, David Geffen School of Medicine at UCLA, 1000 West Carson Street, Harbor Box 446, Torrance, CA 90509, USA.
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Wahjudi PN, K Yee J, Martinez SR, Zhang J, Teitell M, Nikolaenko L, Swerdloff R, Wang C, Lee WNP. Turnover of nonessential fatty acids in cardiolipin from the rat heart. J Lipid Res 2011; 52:2226-2233. [PMID: 21957203 DOI: 10.1194/jlr.m015966] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Cardiolipin (CL) is a unique phospholipid (PL) found in the mitochondria of mammalian cells. CL remodeling is accompanied by turnover of its fatty acid acyl groups. Abnormalities in CL remodeling have been found in Barth's syndrome, diabetes, and obesity. The objective of this study was to determine nonessential fatty acid turnover in CL and phosphatidylethanolamine (PE) in the rat heart in vivo. Sprague-Dawley rats were fed either a regular chow or a high-fat diet for 15 weeks, and consumed 6% deuterium-enriched drinking water as a tracer for 14 days. CL and PE were extracted from cardiac tissue and isolated by TLC. Fatty acids from CL, PE, and plasma were analyzed by GC/MS for deuterium incorporation. Results showed oleate and vaccenate turnover were the highest in CL whereas palmitate and stearate turnover were low. Among the nonessential fatty acids in PE, turnover of stearate and vaccenate were the highest. The high turnover rate in vaccenate was unexpected, because vaccenate previously had no known metabolic or physiologic function. In conclusion, the similarly high turnover rates of both oleate and vaccenate readily suggest that remodeling is an important functional aspect of PL metabolism in CL.
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Affiliation(s)
| | - Jennifer K Yee
- LA Biomedical Research Institute, Torrance, CA; Division of Endocrinology, Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | | | - Jin Zhang
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Michael Teitell
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Liana Nikolaenko
- LA Biomedical Research Institute, Torrance, CA; Division of Endocrinology, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA and
| | - Ronald Swerdloff
- LA Biomedical Research Institute, Torrance, CA; Division of Endocrinology, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA and
| | - Christina Wang
- LA Biomedical Research Institute, Torrance, CA; Division of Endocrinology, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA and
| | - W N Paul Lee
- LA Biomedical Research Institute, Torrance, CA; Division of Endocrinology, Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA.
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Yee JK, Lee WNP, Han G, Ross MG, Desai M. Organ-specific alterations in fatty acid de novo synthesis and desaturation in a rat model of programmed obesity. Lipids Health Dis 2011; 10:72. [PMID: 21569358 PMCID: PMC3112422 DOI: 10.1186/1476-511x-10-72] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Accepted: 05/11/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Small for gestational age (SGA) leads to increased risk of adult obesity and metabolic syndrome. Offspring exposed to 50% maternal food restriction in utero are born smaller than Controls (FR), catch-up in growth by the end of the nursing period, and become obese adults. The objective of the study was to determine stearoyl-CoA desaturase activity (SCD1) and rates of de novo fatty acid synthesis in young FR and Control offspring tissues at the end of the nursing period, as possible contributors to catch-up growth. METHODS From gestational day 10 to term, dams fed ad libitum (Control) or were 50% food-restricted to produce small FR pups. Control dams nursed all pups. At postnatal day 1 (p1) and p21, offspring body tissues were analyzed by GC/MS, and desaturation indices of palmitoleate/palmitate and oleate/stearate were calculated. SCD1 gene expression was determined by real-time PCR on adipose and liver. Offspring were enriched with deuterium that was given to dams in drinking water during lactation and de novo synthesis of offspring body tissues was determined at p21. Primary adipocyte cell cultures were established at p21 and exposed to U(13)C-glucose. RESULTS FR offspring exhibited higher desaturation index in p1 and p21 adipose tissue, but decreased desaturation index in liver at p21. SCD1 gene expression at p21 was correspondingly increased in adipose and decreased in liver. FR subcutaneous fat demonstrated increased de novo synthesis at p21. Primary cell cultures exhibited increased de novo synthesis in FR. CONCLUSIONS Adipose tissue is the first site to exhibit increased de novo synthesis and desaturase activity in FR. Therefore, abnormal lipogenesis is already present prior to onset of obesity during the period of catch-up growth. These abnormalities may contribute to future obesity development.
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Affiliation(s)
- Jennifer K Yee
- Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Bldg RB-1, Harbor Box 446, Torrance, CA 90502, USA.
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Wahjudi PN, Patterson ME, Lim S, Yee JK, Mao CS, Lee WNP. Measurement of glucose and fructose in clinical samples using gas chromatography/mass spectrometry. Clin Biochem 2009; 43:198-207. [PMID: 19747474 DOI: 10.1016/j.clinbiochem.2009.08.028] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2009] [Revised: 08/22/2009] [Accepted: 08/28/2009] [Indexed: 01/14/2023]
Abstract
OBJECTIVE The impact of increased fructose consumption on carbohydrate metabolism is a topic of current interest, but determination of serum level has been hindered due to low concentration and interference from serum glucose. We are reporting a method for the quantification of glucose and fructose in clinical samples using gas chromatography/mass spectrometry (GC/MS). The accuracy and precision of GC/MS and an enzymatic assay were compared. DESIGN AND METHODS Mass spectrometry fragmentation patterns of methyloxime peracetate derivatized aldose and ketose were determined. Unique fragments for glucose and fructose were used for quantitative analysis using isotope labeled recovery standards. RESULTS Methyloxime peracetate derivatives of glucose and fructose showed characteristic loss of acetate (M-60) or ketene (M-42) under chemical ionization (CI). Under electron impact (EI) ionization, a unique C1-C2 fragment of glucose was formed, while a C1-C3 fragment was formed from keto-hexoses. These unique fragments were used in the quantitative assay of glucose and fructose in clinical samples. In clinical samples, the GC/MS assay has a lower limit of detection than that of the enzymatic assay. In plasma samples from patients evaluated for diabetes the average serum glucose and fructose were 6.19+/-2.72 mM and 46+/- 25.22 microM. Fructose concentrations in many of these samples were below the limit of detection of the enzymatic method. CONCLUSION Derivatization of aldose and ketose monosaccharides to their respective O-methyloxime acetates for GC/MS analysis is a facile method for determination of serum/plasma glucose and fructose samples.
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Affiliation(s)
- Paulin N Wahjudi
- Los Angeles Biomedical Research Institute, 1124 West Carson Torrance, CA 90502, USA
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Yee JK, Mao CS, Hummel HS, Lim S, Sugano S, Rehan VK, Xiao G, Lee WNP. Compartmentalization of stearoyl-coenzyme A desaturase 1 activity in HepG2 cells. J Lipid Res 2008; 49:2124-34. [PMID: 18599738 DOI: 10.1194/jlr.m700600-jlr200] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Stearoyl-coenzyme A desaturase 1 (SCD1) catalyzes the conversion of stearate (18:0) to oleate (18:1n-9) and of palmitate (16:0) to palmitoleate (16:1), which are key steps in triglyceride synthesis in the fatty acid metabolic network. This study investigated the role of SCD1 in fatty acid metabolism in HepG2 cells using SCD1 inhibitors and stable isotope tracers. HepG2 cells were cultured with [U-(13)C]stearate, [U-(13)C]palmitate, or [1,2-(13)C]acetate and (1) DMSO, (2) compound CGX0168 or CGX0290, or (3) trans-10,cis-12 conjugated linoleic acid (CLA). (13)C incorporation into fatty acids was determined by GC-MS and desaturation indices calculated from the respective ion chromatograms. FAS, SCD1, peroxisome proliferator-activated receptor alpha, and peroxisome proliferator-activated receptor gamma mRNA levels were assessed by semiquantitative RT-PCR. The addition of CGX0168 and CGX0290 decreased the stearate and palmitate desaturation indices in HepG2 cells. CLA led to a decrease in the desaturation of stearate only, but not palmitate. Comparison of desaturation indices based on isotope enrichment ratios differed, depending on the origin of saturated fatty acid. SCD1 gene expression was not affected in any group. In conclusion, the differential effects of SCD1 inhibitors and CLA on SCD1 activity combined with the dependence of desaturation indices on the source of saturated fatty acid strongly support the compartmentalization of desaturation systems. The effects of SCD1 inhibition on fatty acid composition in HepG2 cells occurred through changes in the dynamics of the fatty acid metabolic network and not through transcriptional regulatory mechanisms.
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Affiliation(s)
- Jennifer K Yee
- Department of Pediatrics, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, USA
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Abstract
Recombinant vectors derived from murine leukemia virus (MLV) have been widely used to introduce genes in human gene therapy clinical trials and have shown the potential for medical applications and the promise of significantly improving medical therapies. Yet, the demonstrated limitations of these vectors support the need for continued development of improved vectors. The intrinsic properties associated with the MLV genome and its life cycle do not favor the successful application of this vector system in certain human gene transfer applications. Since MLV integrates randomly into the host genome, transgene expression is frequently affected by the flanking host chromatin. MLV insertions can often result in silencing or position effect variation of gene expression either immediately after insertion or following cell expansion in culture or in vivo. Migration of the MLV pre-integration complex from the cytoplasm into the nucleus of infected cells requires mitosis for nuclear membrane breakdown. Since a majority of human cells exist in a quiescent state in vivo, it is unlikely that direct in vivo gene delivery into target tissues can be achieved with the MLV vector system. Finally, insertion of tissue-specific cis-regulatory sequences to direct transgene expression frequently results in either the rearrangement of the vector sequence or disruption of the cis-regulatory sequence functions. The long terminal repeat (LTR) of MLV, which contains a ubiquitously active enhancer/promoter element, may partially account for this problem. Together, these problems pose a major obstacle for the use of MLV vectors in the treatment of human diseases. This Chapter discusses some of the potential targets to which HIV vectors might be applied in clinical settings and some of the issues surrounding use of HIV vectors in gene transfer clinical trials.
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Affiliation(s)
- J K Yee
- Department of Virology, Beckman Research Institute City of Hope, Duarte, California 91010, USA
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Peng H, Chen ST, Wergedal JE, Polo JM, Yee JK, Lau KH, Baylink DJ. Development of an MFG-based retroviral vector system for secretion of high levels of functionally active human BMP4. Mol Ther 2001; 4:95-104. [PMID: 11482980 DOI: 10.1006/mthe.2001.0423] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We sought to develop a retroviral vector system that would produce secretion of high levels of bone morphogenetic protein (BMP)-4 by optimizing the expression construct and developing an improved retroviral vector. Replacement of the propeptide domain of BMP4 with that of BMP2 increased the secretion level of mature BMP4 protein in transduced cells. The intact BMP2 pro-peptide sequence was essential, as deletion of a small part of the propeptide sequence of BMP2 from the BMP2/4 hybrid construct diminished BMP4 expression and secretion. Addition of a hemaglutinin tag to the carboxy terminus of BMP4 abolished the bioactivity of secreted BMP4. Transduction of rat marrow stromal cells (and fibroblasts) with an MFG-based retroviral vector pseudotyped with VSV-G envelope containing this BMP2/4 hybrid expression construct led to secretion of very high levels of mature BMP4 in conditioned medium (up to 1 microg/10(6) cells/24 hours). The secreted BMP4 was biologically active, as it induced alkaline phosphatase expression in C2C12 cells. The transduced rat marrow stromal cells expressing mature BMP4 induced de novo ectopic bone formation in syngenic immune-competent rats. We have developed an MFG-based retroviral vector system that causes secretion of high levels of functionally active human BMP4 protein.
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Affiliation(s)
- H Peng
- Department of Medicine, Loma Linda University, and Musculoskeletal Disease Center (151), Jerry L. Pettis VA Medical Center, Loma Linda, California 92357, USA
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Abstract
Vectors derived from murine leukemia virus (MLV) have been used in many human gene therapy clinical trials. However, insertion of the locus control regions (LCRs) derived from the beta-globin gene locus or the CD2 gene into MLV vectors frequently led to vector rearrangement. Since the human immunodeficiency virus (HIV) sequence diverges significantly from the MLV sequence, we tested whether the LCR sequence is more stable in the context of an HIV vector. Clones derived from human fibrosarcoma line HT1080 cells transduced with an HIV vector containing the T-cell-specific CD2 LCR exhibit the same wide range of transgene expression as clones lacking the LCR. In contrast, Jurkat and primary T-cell clones derived from the transduction of the LCR-containing vector show, on average, a three- to fourfold increase in transgene expression relative to that of the control vector. This is consistent with previous observations that the CD2 LCR contains a T-cell-specific enhancer. In addition, the clones derived from the LCR-containing vector have a much lower clonal variation in transgene expression than those derived from the control vector. We also demonstrate that the level of transgene expression is proportional to the vector copy number. These results suggest that the human CD2 LCR sequence is compatible with HIV vector sequences and confers enhanced integration site-independent and copy number-dependent expression of the transgene. Thus, HIV vectors may represent the ideal vehicle to deliver genes controlled by various cis-acting elements such as LCRs.
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Affiliation(s)
- C M Kowolik
- Department of Virology, Beckman Research Institute, City of Hope, Duarte, California, USA
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Abstract
TCR engagement leads to the transcriptional activation of cytokine genes and activation-induced cell death. Activated T cells undergo apoptosis upon expression and ligation of Fas ligand (FasL) to Fas/APO-1 (CD95) receptor. FasL expression is under the transcriptional regulation of multiple factors. The present study demonstrates that TCR-inducible FasL expression is also under the direct influence of the IFN regulatory factor (IRF) transcription factor family. Deletion and mutagenesis of a putative IRF-1 binding site in the FasL promoter results in deficient expression of FasL. EMSAs demonstrate specific FasL promoter binding by IRF-1 and IRF-2. Forced expression of either IRF-1 or IRF-2 leads to FasL promoter activation in T cells and FasL expression in heterologous cells. Finally, suppression of IRF-1 expression in T cells results in deficient TCR-induced FasL expression. These results confirm that the IRF family participates in the regulation of FasL gene expression.
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Affiliation(s)
- W A Chow
- Department of Medical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA.
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Johnston JC, Gasmi M, Lim LE, Elder JH, Yee JK, Jolly DJ, Campbell KP, Davidson BL, Sauter SL. Minimum requirements for efficient transduction of dividing and nondividing cells by feline immunodeficiency virus vectors. J Virol 1999; 73:4991-5000. [PMID: 10233961 PMCID: PMC112543 DOI: 10.1128/jvi.73.6.4991-5000.1999] [Citation(s) in RCA: 151] [Impact Index Per Article: 6.0] [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: 11/20/2022] Open
Abstract
The development of gene delivery vectors based on feline immunodeficiency virus (FIV) is an attractive alternative to vectors based on primate sources for the delivery of genes into humans. To investigate the requirements for efficient transduction of dividing and nondividing cells by vector particles based on FIV, a series of packaging and vector constructs was generated for which viral gene expression was minimized and from which unnecessary cis-acting sequences were deleted. Pseudotyped vector particles produced in 293T cells were used to transduce various target cells, including contact-inhibited human skin fibroblasts and growth-arrested HT1080 cells. FIV vectors in which the U3 promoter was replaced with the cytomegalovirus promoter gave rise to over 50-fold-higher titers than FIV vectors containing the complete FIV 5' long terminal repeat (LTR). Comparison of the transduction efficiencies of vectors containing different portions of the FIV Gag coding region indicates that at least a functional part of the FIV packaging signal (Psi) is located within an area which includes the 5' LTR and the first 350 bp of gag. Transduction efficiencies of vectors prepared without FIV vif and orf2 accessory gene expression did not differ substantially from those of vectors prepared with accessory gene expression in either dividing or nondividing cells. The requirement for FIV rev-RRE was, however, demonstrated by the inefficient production of vector particles in the absence of rev expression. Together, these results demonstrate the efficient transduction of nondividing cells in vitro by a multiply attenuated FIV vector and contribute to an understanding of the minimum requirements for efficient vector production and infectivity. In addition, we describe the ability of an FIV vector to deliver genes in vivo into hamster muscle tissue.
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Affiliation(s)
- J C Johnston
- Center for Gene Therapy, Chiron Technologies, San Diego, California 92121, USA
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Gasmi M, Glynn J, Jin MJ, Jolly DJ, Yee JK, Chen ST. Requirements for efficient production and transduction of human immunodeficiency virus type 1-based vectors. J Virol 1999; 73:1828-34. [PMID: 9971760 PMCID: PMC104422 DOI: 10.1128/jvi.73.3.1828-1834.1999] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.1] [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: 11/20/2022] Open
Abstract
A number of human immunodeficiency type 1 (HIV-1)-based vectors have recently been shown to transduce nondividing cells in vivo as well as in vitro. However, if these vectors are to be considered for eventual clinical use, a major consideration is to reduce the probability of unintended generation of replication-competent virus. This can be achieved by eliminating viral genetic elements involved in the generation of replication-competent virus without impairing vector production. We have designed a system to transiently produce HIV-1-based vectors by using expression plasmids encoding Gag, Pol, and Tat of HIV-1 under the control of the cytomegalovirus immediate-early promoter. Our data show that the best vector yield is achieved in the presence of the Rev/Rev-responsive element (RRE) system. However, the constitutive transport element of Mason-Pfizer monkey virus can substitute for RRE and Rev at least to some extent, whereas the posttranscriptional regulatory element of human hepatitis B virus appeared to be inefficient. In addition, we show that high-titer virus preparations can be obtained in the presence of sodium butyrate, which activates the expression of both the packaging construct and the vector genome. Finally, our results suggest that efficient infectivity of vectors defective in the accessory proteins Vif, Vpr, Vpu, and Nef depends on the nature of the target cells.
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Affiliation(s)
- M Gasmi
- Center for Gene Therapy, Chiron Technologies, San Diego, California 92121, USA
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Yam PY, Yee JK, Ito JI, Sniecinski I, Doroshow JH, Forman SJ, Zaia JA. Comparison of amphotropic and pseudotyped VSV-G retroviral transduction in human CD34+ peripheral blood progenitor cells from adult donors with HIV-1 infection or cancer. Exp Hematol 1998; 26:962-8. [PMID: 9728931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
In this study we compared the transduction efficiency of conventional amphotropic MoMLV (LPONL[A]) with the MoMLV pseudotyped with that of VSV-G (LPONL[G]) in peripheral blood progenitor cells (PBPCs) from cancer patients and human immunodeficiency virus (HIV)-infected donors. The results showed that LPONL(A) and LPONL(G) infected the progenitor cells from these sources with equal efficiencies. The transgene neoR was detectable by polymerase chain reaction assay in colonies from 14-day colony-forming unit (CFU) assays and in those derived from long-term culture-initiating cell (LTC-ICs) assays. Although the overall levels of transduction efficiency were similar in cord blood and PBPCs from noninfected cancer donors (25-22%) when either LPONL(G) or LPONL(A) was used, they were significantly lower in HIV-1-infected donors compared with noninfected cancer donors when LPONL(G) was used (13 vs. 25%; p = 0.027), and when LPONL(A) was used (12 vs. 22%; p = 0.087). The clonogenic potentials of infected and noninfected CD34+ cells were similar; thus no toxicity could be attributed to the virus preparation. We conclude that PBPCs from HIV-1-infected individuals are transduced less efficiently than those from non-HIV-infected cancer donors. Nonetheless, PBPCs from HIV-infected persons serve as potential targets in gene therapy for acquired immune deficiency syndrome.
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Affiliation(s)
- P Y Yam
- Department of Virology and Infectious Diseases, City of Hope National Medical Center, Duarte, CA 91010, USA
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36
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Burns JC, Yee JK, Yu AL. Methods for producing high titer, pantropic retroviral vectors for gene transfer into leukemic T-cells. Methods Mol Med 1997; 7:213-221. [PMID: 24493429 DOI: 10.1385/0-89603-484-4:213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Current limitations to the use of Moloney murine leukemia virus (MoMLV)-derived retroviral vectors as a tool for gene transfer include the inability to obtain high-titer vector stocks and the narrow host cell range of these vectors. To overcome these disadvantages, we developed a new class of pantropic retroviral vector that has a broadened host cell range and can be concentrated to very high titers (>10(9) colony forming units [CFU]/mL) (1).
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Affiliation(s)
- J C Burns
- Department of Pediatrics, School of Medicine, University of California, San Diego, CA
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37
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Chen ST, Iida A, Guo L, Friedmann T, Yee JK. Generation of packaging cell lines for pseudotyped retroviral vectors of the G protein of vesicular stomatitis virus by using a modified tetracycline inducible system. Proc Natl Acad Sci U S A 1996; 93:10057-62. [PMID: 8816750 PMCID: PMC38335 DOI: 10.1073/pnas.93.19.10057] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.0] [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: 02/02/2023] Open
Abstract
We have previously shown that the G protein of vesicular stomatitis virus (VSV-G) can be incorporated into the virions of retroviruses. Since expression of VSV-G is toxic to most mammalian cells, development of stable VSV-G packaging cell lines requires inducible VSV-G expression. We have modified the tetracycline-inducible system by fusing the ligand binding domain of the estrogen receptor to the carboxy terminus of a tetracycline-regulated transactivator. Using this system, we show that VSV-G expression is tetracycline-dependent and can be modulated by beta-estradiol. Stable packaging cell lines can readily be established and high-titer pseudotyped retroviral vectors can be generated upon induction of VSV-G expression.
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Affiliation(s)
- S T Chen
- Department of Pediatrics, University of California at San Diego, La Jolla 92093, USA
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38
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Abstract
The ability to regulate gene expression via exogenous stimuli will facilitate the study of gene functions in mammalian cells. In the present study, we modified the tetracycline-controlled inducible system by the addition of the ligand-binding domain of the estrogen receptor to the carboxy terminus of the tTA transactivator. A single retroviral vector can transduce both the transactivator gene and the gene of interest controlled by the tTA-inducible promoter into mammalian cells. We show that cell lines expressing the transactivator can readily be established and that expression of the gene of interest depends on the removal of tetracycline and the addition of estrogen. By using this system, cell lines with inducible expression of the G protein of vesicular stomatitis virus, a potentially toxic gene product, were established. The combination of a powerful inducible system and retrovirus-mediated gene transfer can not only be used to study gene function but may also be applied in the future to clinical trials in human gene therapy.
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Affiliation(s)
- A Iida
- Department of Pediatrics, City of Hope National Medical Center, Duarte, California 91010-3000, USA
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Burns JC, McNeill L, Shimizu C, Matsubara T, Yee JK, Friedmann T, Kurdi-Haidar B, Maliwat E, Holt CE. Retrovirol gene transfer in Xenopus cell lines and embryos. In Vitro Cell Dev Biol Anim 1996; 32:78-84. [PMID: 8907120 DOI: 10.1007/bf02723038] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A new class of retroviral vector pseudotypes have an expanded host species range and can be concentrated to high titers by ultracentrifugation. These pantropic vectors contain the genome of the murine leukemia virus-based vectors and the envelope protein of vesicular stomatitis virus substituted for the amphotropic envelope protein. We tested (a) the ability of pseudotyped (pantropic) and unmodified (amphotropic) vectors to stably infect three different Xenopus laevis cell lines, including one derived from the embryonic retina; and (b) the ability of the concentrated pseudotyped virus to infect embryos and to mediate foreign gene expression in the embryonic CNS. Expression of the neomycin phosphotransferase gene and single copy integration of the provirus into the genome of the cell lines was demonstrated. Surprisingly, the amphotropic and pantropic vectors generated neomycin-resistant clones with similar efficiency. PCR amplification of genomic DNA from single stage 10, 20, and 25 embryos microinjected in the blastocoel or neural tube cavities with concentrated pantropic vector (10(8) cfu/ml) revealed proviral DNA. Microinjection of a concentrated pantropic vector containing the coding sequence for the beta-galactosidase gene into the neural tube lumen of 24-h embryos yielded beta-galactosidase expressing cells in the brain. Thus, retroviral vectors provide an additional approach to existing strategies for gene transfer in Xenopus embryos and cell lines.
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Affiliation(s)
- J C Burns
- Department of Pediatrics and Center for Molecular Genetics, La Jolla, California 92093, USA
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40
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Affiliation(s)
- T Friedmann
- Department of Pediatrics, University of California San Diego School of Medicine, La Jolla 92093, USA
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41
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Miyanohara A, Yee JK, Bouic K, LaPorte P, Friedmann T. Efficient in vivo transduction of the neonatal mouse liver with pseudotyped retroviral vectors. Gene Ther 1995; 2:138-42. [PMID: 7719930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Ideal methods for human gene therapy will eventually include direct gene transfer to defective tissues in a patient in vivo. Toward that goal, we have used high titer, pseudotyped retroviral vectors expressing genes for the Escherichia coli beta-galactosidase (lacZ) or hepatitis B virus surface antigen (HBsAg) to infect mouse liver by in vivo direct injection into the liver parenchyma. We have found that a single percutaneous injection of small volumes of vectors into the newborn mouse liver leads to transduction of at least 25-30% of the hepatocytes throughout the liver, as judged by in situ staining of liver sections for beta-gal activity at 4 weeks after injection. We have demonstrated that stable levels of HBsAg were also detected in the circulation of injected mice up to 4 months after HBsAg-vector injection. We suggest that the high efficiency of in vivo transduction in the neonatal liver and subsequent stable transgene expression by high-titer pseudotyped retroviral vectors in the absence of an invasive partial hepatectomy may effectively be applied to gene therapy studies in a number of human liver disease [corrected].
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Affiliation(s)
- A Miyanohara
- Department of Pediatrics, UCSD School of Medicine, La Jolla, CA 92093
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42
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Yee JK, Miyanohara A, LaPorte P, Bouic K, Burns JC, Friedmann T. A general method for the generation of high-titer, pantropic retroviral vectors: highly efficient infection of primary hepatocytes. Proc Natl Acad Sci U S A 1994; 91:9564-8. [PMID: 7937806 PMCID: PMC44853 DOI: 10.1073/pnas.91.20.9564] [Citation(s) in RCA: 413] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Retroviral vectors have been central components in many studies leading to human gene therapy. However, the generally low titers and inefficient infectivity of retroviral vectors in human cells have limited their use. We previously reported that the G protein of vesicular stomatitis virus can serve as the exclusive envelope protein component for one specific retroviral vector, LGRNL, that expresses vesicular stomatitis virus G. We now report a more useful general transient transfection scheme for producing very high-titer vesicular stomatitis virus G-enveloped pseudotypes from any Moloney murine leukemia-based retroviral vector without having to rely on the expression of the cytotoxic G protein from the retroviral vector itself. We also demonstrate very high efficiency of infection with a pseudotyped lacZ vector in primary mouse hepatocytes. We suggest that pseudotyped retroviral vectors carrying reporter genes will permit genetic studies in many previously inaccessible vertebrate and invertebrate systems. Furthermore, because these vectors represent retroviral vectors of sufficiently high titer to allow efficient direct retroviral-mediated in vivo gene transfer, we also suggest that pseudotyped vectors carrying potentially therapeutic genes will become useful to test the potential for in vivo gene therapy.
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Affiliation(s)
- J K Yee
- Department of Pediatrics, University of California, San Diego, La Jolla 92093
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Burns JC, Matsubara T, Lozinski G, Yee JK, Friedmann T, Washabaugh CH, Tsonis PA. Pantropic retroviral vector-mediated gene transfer, integration, and expression in cultured newt limb cells. Dev Biol 1994; 165:285-9. [PMID: 8088445 DOI: 10.1006/dbio.1994.1253] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [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: 01/28/2023]
Abstract
Limb regeneration is a unique developmental phenomenon restricted to certain urodeles in which limb cells dedifferentiate and produce the blastema and then redifferentiate into the tissues that compose the missing part. Genetic modification of the blastema cells would greatly facilitate understanding the programmed gene expression that results in the reconstitution of the limb. To test whether pantropic retroviral vectors pseudotyped with the vesicular stomatitis virus G glycoprotein could mediate gene transfer into blastema cells, we infected a stable newt limb cell line and demonstrated integration and expression of the provirus. Thus, pantropic retroviral vectors offer a new tool for the study of limb regeneration and other developmental phenomena in amphibia.
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Affiliation(s)
- J C Burns
- Department of Pediatrics, UCSD School of Medicine, La Jolla 92093-0609
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44
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Abstract
The zebrafish is rapidly becoming a popular model system for the study of vertebrate development because it is ideal for both embryological studies and genetic analysis. To determine if a retroviral vector pseudotyped with the envelope glycoprotein of the vesicular stomatitis virus could infect zebrafish embryos, and in particular, the cells destined to become the germ line, a pseudotyped virus was injected into blastula-stage zebrafish embryos. Fifty-one embryos were allowed to develop and eight transmitted proviral DNA to their progeny. Founders were mosaic, but as expected, transgenic F1's transmitted proviral DNA in a Mendelian fashion to the F2 progeny. Transgenic F1 fish inherited a single integrated provirus, and a single founder could transmit more than one viral integration to its progeny. These results demonstrate that this pantropic pseudotyped vector, originally developed for human gene therapy, will make the use of retroviral vectors in zebrafish possible.
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Affiliation(s)
- S Lin
- Center for Cancer Research, Massachusetts Institute of Technology, Cambridge 02139
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45
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Runnebaum IB, Yee JK, Kieback DG, Sukumar S, Friedmann T. Wild-type p53 suppresses the malignant phenotype in breast cancer cells containing mutant p53 alleles. Anticancer Res 1994; 14:1137-44. [PMID: 8074464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We have examined the effect of expression of a retrovirally mediated wild-type (wt) p53 allele on the neoplastic properties of five human breast cancer cell lines expressing mutant p53. After infection with the retroviral vector Lhp53RNL expressing both the neomycin phosphotransferase gene and the wt p53 gene, the ability of infected cells to form colonies in G418 selective medium was markedly reduced and their morphology demonstrated changes toward a flattened and enlarged phenotype. Employing a high multiplicity of infection (MOI) with Lhp53RNL without neoR selection, the replication of wt p53-reconstituted cells was greatly reduced. The ability of the genetically modified cells to produce colonies in semi-solid medium and to form tumors in recipient nude mice was also markedly suppressed. Restoration of wt p53 expression in human breast cancer cells expressing endogenous mt (mutant) p53 can suppress some aspects of the malignant phenotype by a trans-dominant mechanism.
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Affiliation(s)
- I B Runnebaum
- Center for Molecular Genetics, University of California San Diego, La Jolla 92093-0634
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46
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Yamada O, Yu M, Yee JK, Kraus G, Looney D, Wong-Staal F. Intracellular immunization of human T cells with a hairpin ribozyme against human immunodeficiency virus type 1. Gene Ther 1994; 1:38-45. [PMID: 7584058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
T-cell lines (Jurkat and Molt-4) were transduced with retroviral vectors containing a hairpin ribozyme that targets a conserved sequence in the 5' transcribed leader sequence of human immunodeficiency virus (HIV) type 1. Stable cell lines were generated which constitutively and persistently expressed the ribozyme gene driven by either the Moloney retroviral long terminal repeat (LTR) or an internal human tRNA(val) promoter. There was no apparent deleterious effect of long-term ribozyme expression on cell proliferation or viability. Cells expressing ribozyme were resistant to challenge from diverse strains of HIV, including an uncloned clinical isolate. No reverse transcriptase activity or virus infectivity was detectable in the culture supernatants of Jurkat cells expressing the ribozyme driven by the tRNA(val) promoter up to 35 days after challenge with HIV-1/HXB2. Expression of the ribozyme also significantly decreased (by approximately 50- to 100-fold) the efficiency of incoming virus to synthesize viral DNA. These and previously reported results indicate that transfer and expression of the ribozyme gene interfere with both early and late events in the HIV replication cycle and confer long-term resistance to HIV-1 infection.
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Affiliation(s)
- O Yamada
- Department of Medicine, University of California, San Diego, La Jolla 92093-0665, USA
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47
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Abstract
Encapsidation of the VSV G protein into the virions of MoMLV-derived retroviral vectors in the absence of other VSV-encoded proteins is shown to be an efficient process, although the exact mechanism for this process is currently unclear. Unlike the conventional retroviral vectors bearing the amphotropic envelope protein, the pseudotyped virus has the ability to withstand the shearing forces encountered during ultracentrifugation. This property of the pseudotyped virus enables the generation of high-titer retroviral vector stocks and has potential application for in vivo gene therapy studies. We have found as many as four copies of a pseudotyped vector to integrate into the genome of a single cell when a high multiplicity of infection was used to infect the cells. Multiple integration events were not observed with amphotropic retroviral vectors, probably because of their low virus titers. In addition, when retroviral vectors are pseudotyped with the VSV G protein, they acquire the host range of VSV and are able to infect nonmammalian cells derived from fish, Xenopus, mosquito, and Lepidoptera. Since techniques for efficient gene transfer in some of these nonmammalian systems are not currently available, retrovirus-mediated gene transfer described here should be useful for transgenic and other genetic studies in lower vertebrate species. The inability to establish a stable cell line expressing the VSV G protein, however, limits large-scale production of the pseudotyped retroviral vectors. Generation of stable packaging cell lines for the pseudotyped retroviral vectors is a major challenge for the future.
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Affiliation(s)
- J K Yee
- Department of Pediatrics, City of Hope, Duarte, California 91010
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48
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Abstract
Hepatitis B virus (HBV) infection is associated with the development of hepatocellular carcinoma in humans. HBV infection is primarily restricted to hepatocytes, and replication and gene expression of HBV require liver-specific transcription factors. Regulation of HBV gene expression has been shown to be controlled by two enhancers, and liver-specific gene expression of HBV can be attributed largely to the activity of enhancer 2. In this study, we have used mutational analysis to identify a 20-base-pair sequence motif essential for the liver-specific enhancer 2 activity. Analysis of the sequence reveals that this motif is similar to the regulatory region of several other liver-specific cellular genes, suggesting that common transcription factors may be involved in the activation of cellular as well as HBV gene expression in hepatocytes.
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Affiliation(s)
- S T Chen
- Department of Pediatrics, University of California, San Diego, La Jolla 92093
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49
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Burns JC, Friedmann T, Driever W, Burrascano M, Yee JK. Vesicular stomatitis virus G glycoprotein pseudotyped retroviral vectors: concentration to very high titer and efficient gene transfer into mammalian and nonmammalian cells. Proc Natl Acad Sci U S A 1993; 90:8033-7. [PMID: 8396259 PMCID: PMC47282 DOI: 10.1073/pnas.90.17.8033] [Citation(s) in RCA: 1003] [Impact Index Per Article: 32.4] [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: 01/30/2023] Open
Abstract
The restricted host-cell range and low titer of retroviral vectors limit their use for stable gene transfer in eukaryotic cells. To overcome these limitations, we have produced murine leukemia virus-derived vectors in which the retroviral envelope glycoprotein has been completely replaced by the G glycoprotein of vesicular stomatitis virus. Such vectors can be concentrated by ultracentrifugation to titers > 10(9) colony-forming units/ml and can infect cells, such as hamster and fish cell lines, that are ordinarily resistant to infection with vectors containing the retroviral envelope protein. The ability to concentrate vesicular stomatitis virus G glycoprotein pseudotyped vectors will facilitate gene therapy model studies and other gene transfer experiments that require direct delivery of vectors in vivo. The availability of these pseudotyped vectors will also facilitate genetic studies in nonmammalian species, including the important zebrafish developmental system, through the efficient introduction and expression of foreign genes.
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Affiliation(s)
- J C Burns
- Department of Pediatrics, University of California, San Diego School of Medicine, La Jolla 92093
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50
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Abe A, Takeo T, Emi N, Tanimoto M, Ueda R, Yee JK, Friedmann T, Saito H. Transduction of a drug-sensitive toxic gene into human leukemia cell lines with a novel retroviral vector. Proc Soc Exp Biol Med 1993; 203:354-9. [PMID: 8390693 DOI: 10.3181/00379727-203-43611] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
To investigate the possibility of killing tumor cells by the expression of an exogenously introduced toxic gene, we have constructed a novel retroviral vector (LTRNL) which has the polyA signal deleted herpes simplex virus type 1 thymidine kinase (HSV1-tk) gene. The vector becomes toxic by treating cells expressing HSV1-tk with the antiherpetic drugs acyclovir or ganciclovir (GCV). Cells of the human leukemia lines (K562, MEG-01) were infected with this vector and two transduced cell lines (K562/LTRNL, MEG-01/LTRNL) were established. Southern blot analysis confirmed the integration of the HSV1-tk transgene in these cells and Northern blot analysis exhibited the expression of 4.8-kb viral mRNA containing the HSV1-tk gene. The MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay for the in vitro cytotoxic effects of GCV to these cells demonstrated that concentrations of about 2.5 microM for K562/LTRNL and 1.25 microM for MEG-01/LTRNL cells resulted in 50% inhibition of cell growth after 72 hr. Subcutaneous tumors of MEG-01/LTRNL in KSN nude mice, but not those of uninfected MEG-01 cells, showed durable regressions after exposure of the mice to 40 mg/kg of GCV given subcutaneously once a day for 15 days. This study indicates that the LTRNL-infected human leukemia cells exhibit inducible susceptibility to GCV.
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Affiliation(s)
- A Abe
- First Department of Internal Medicine, Nagoya University School of Medicine, Japan
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