Divergent determinants of 18F-NaF uptake and visible calcium deposition in large arteries: relationship with Framingham risk score.

Abstract To compare regional vascular distribution and biological determinants of visible calcium load, as assessed by computed tomography, as well as of molecular calcium deposition as assessed by (18)F-NaF positron emission tomography. Eighty oncologic patients undergoing (18)F-NaF PET/CT scan were included in the study. Cardiovascular-risk stratification was performed according to a simplified version of the Framingham model [including age, diabetes, smoking, systolic blood pressure and body mass index (BMI)]. Arterial (18)F-NaF uptake was measured by drawing regions of interest comprising the arteries on each slice of the transaxial PET/CT and normalized to blood (18)F-NaF activity to obtain the arterial target-to-background ratio (TBR). The degree of arterial calcification (AC) was measured using a software program providing Agatston-like scores. Differences in mean values and regression analysis were tested. Predictors of AC and TBR were evaluated by univariate and multivariate analysis. p value of 0.05 was considered statistically significant. No correlation was documented between regional calcium load and regional TBR in any of the studied arterial segments. Visible calcium deposition was found to be dependent upon age while it was not influenced by all the remaining determinants of cardiovascular risk. By contrast, (18)F-NaF uptake was significantly correlated with all descriptors of cardiovascular risk, with the exception of BMI. Vascular (18)F-NaF uptake displays a different regional distribution, as well as different biological predictors, when compared to macroscopic AC. The tight dependency of tracer retention upon ongoing biological determinants of vascular damage suggests that this tool might provide an unexplored window on plaque pathophysiology

Metformin temporal and localized effects on gut glucose metabolism assessed using 18F-FDG PET in mice.

In the course of metformin treatment, staging abdominal cancer lesions with (18)F-FDG PET images is often hindered by the presence of a high bowel radioactivity. The present study aimed to verify the mechanism underlying this phenomenon. METHODS: Fifty-three mice were submitted to dynamic acquisitions of (18)F-FDG kinetics under fasting conditions. Three small-animal PET scans were obtained over a 4-mo study period. The animals were subdivided into 4 groups according to the following metformin administration protocol: group 1, untreated mice (n = 15); group 2, mice exposed to metformin treatment (750 mg/kg/d) for the 48 h before each PET study (pulsed, n = 10); group 3, mice treated for the whole study period (prolonged, n = 10); and group 4, mice in which prolonged treatment was interrupted 48 h before PET (interrupted, n = 8). The rate constant of (18)F-FDG uptake was estimated by Patlak analysis. At the end of the study, the ileum and colon were harvested, washed, and counted ex vivo. Two further groups, of 5 animals each, were included to evaluate the effect of prolonged metformin treatment on phosphorylated adenosine monophosphate (AMP)-activated protein kinase (pAMPK) form and gene expression for thioredoxin-interacting protein (TXNIP). RESULTS: Pulsed treatment did not modify gut tracer retention with respect to the untreated group. Conversely, prolonged treatment induced a progressive increase in (18)F-FDG uptake that selectively involved the colonic wall, without any significant contamination of bowel content. This effect persisted after a complete drug washout in the interrupted group. These responses were paralleled by increased pAMPK availability and by reduced expression of TXNIP messenger RNA in colonic enterocytes exposed to prolonged metformin treatment. CONCLUSION: Metformin causes a selective increase in colonic (18)F-FDG uptake. This effect appears after a relatively long period of treatment and persists soon after drug washout. Accordingly, the increased bowel glucose metabolism reflects a biologic response to chronic metformin treatment characterized by increased levels of pAMPK and reduced levels of TXNIP

Correction to: International prospective observational cohort study of Zika in infants and pregnancy (ZIP study): study protocol

Submitted by Raphael Belchior ([email protected]) on 2020-04-02T14:11:51Z No. of bitstreams: 1 CRIS-IGM - IAM - IFF - Correction to International prospective observational.pdf: 200493 bytes, checksum: eaf9fa851765899cd56883a5e128bb4e (MD5)Approved for entry into archive by Raphael Belchior ([email protected]) on 2020-04-02T14:14:55Z (GMT) No. of bitstreams: 1 CRIS-IGM - IAM - IFF - Correction to International prospective observational.pdf: 200493 bytes, checksum: eaf9fa851765899cd56883a5e128bb4e (MD5)Made available in DSpace on 2020-04-02T14:14:55Z (GMT). No. of bitstreams: 1 CRIS-IGM - IAM - IFF - Correction to International prospective observational.pdf: 200493 bytes, checksum: eaf9fa851765899cd56883a5e128bb4e (MD5) Previous issue date: 2019Social, Statistical and Environmental Sciences, RTI International, Durham, NC, USA.Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis.Centro Nacional de Diagnostico y Referencia, Complejo Nacional de Salud, Managua, Nicaragua.Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, USA.Department of Epidemiology and Biostatistics, College of Public Health, University of Georgia, Athens, GA, USA.Fundação Oswaldo Cruz. Presidência. Centro de Relações Internacionais em Saúde. Rio de Janeiro, RJ, Brasil.Fundación para la Alimentación y Nutrición de Centro América y Panamá (INCAP), Guatemala City, Guatemala.Section of Nutrition, Pediatrics, University of Colorado, Aurora, CO, USA.Division of Infectious Diseases and Vaccinology, School of Public Health, University of California, Berkeley, CA, USA.Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Salvador, BA, Brasil / Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, USA.Section of Nutrition, Pediatrics, University of Colorado, Aurora, CO, USA.Fundação Oswaldo Cruz. Instituto Aggeu Magalhães. Departmento de Virologia e Terapias Experimentais. Recife, PE, Brasil / School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA.Director of Research Institute at Imbanaco Medical Center, Cali, Colombia.Social, Statistical and Environmental Sciences, RTI International, Durham, NC, USA.Programa de Pós-Graduação em Ciências da Saúde (PPGCS) da Universidade de Pernambuco, Microcephaly Epidemic Research Group, Recife, Brazil.Fundação Oswaldo Cruz. Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira. Rio de Janeiro, RJ, Brasil.Ribeirão Preto Medical School, Ribeirão Preto, Brazil.Instituto de Medicina Tropical Alexander von Humboldt and Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru.Department of Pathobiological Sciences, University of Wisconsin, Madison, WI, USA.Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Salvador, BA, Brasil / Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, USA.Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, 38105, USA.Department of Epidemiology, Harvard Chan School of Public Health, Boston, MA, USA.Social, Statistical and Environmental Sciences, RTI International, Durham, NC, USA.Instituto de Medicina Tropical Alexander von Humboldt and Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru.University of Puerto Rico, San Juan, Puerto Rico.Department of Epidemiology and Biostatistics, College of Public Health, University of Georgia, Athens, GA, USA.University of Puerto Rico, San Juan, Puerto Rico.Maternal-Infant Studies Center (CEMI), San Juan, Puerto Rico.Following publication of the original article [1], the author mentioned that two additional NIH staff were involved in the development of the protocol who did not receive recognition in the Acknowledgments section in their published article

International prospective observational cohort study of Zika in infants and pregnancy (ZIP study): study protocol

Submitted by Raphael Belchior ([email protected]) on 2020-04-02T13:47:38Z No. of bitstreams: 1 CRIS-IGM - IAM - IFF - International prospective observational.pdf: 600810 bytes, checksum: 8e0c7389346277503afb09ceb41010da (MD5)Approved for entry into archive by Raphael Belchior ([email protected]) on 2020-04-02T14:05:08Z (GMT) No. of bitstreams: 1 CRIS-IGM - IAM - IFF - International prospective observational.pdf: 600810 bytes, checksum: 8e0c7389346277503afb09ceb41010da (MD5)Made available in DSpace on 2020-04-02T14:05:08Z (GMT). No. of bitstreams: 1 CRIS-IGM - IAM - IFF - International prospective observational.pdf: 600810 bytes, checksum: 8e0c7389346277503afb09ceb41010da (MD5) Previous issue date: 2019Social, Statistical and Environmental Sciences, RTI International, Durham, NC, USA.Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis.Centro Nacional de Diagnostico y Referencia, Complejo Nacional de Salud, Managua, Nicaragua.Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, USA.Department of Epidemiology and Biostatistics, College of Public Health, University of Georgia, Athens, GA, USA.Fundação Oswaldo Cruz. Presidência. Centro de Relações Internacionais em Saúde. Rio de Janeiro, RJ, Brasil.Fundación para la Alimentación y Nutrición de Centro América y Panamá (INCAP), Guatemala City, Guatemala.Section of Nutrition, Pediatrics, University of Colorado, Aurora, CO, USA.Division of Infectious Diseases and Vaccinology, School of Public Health, University of California, Berkeley, CA, USA.Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Salvador, BA, Brasil / Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, USA.Section of Nutrition, Pediatrics, University of Colorado, Aurora, CO, USA.Fundação Oswaldo Cruz. Instituto Aggeu Magalhães. Departmento de Virologia e Terapias Experimentais. Recife, PE, Brasil / School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA.Director of Research Institute at Imbanaco Medical Center, Cali, Colombia.Social, Statistical and Environmental Sciences, RTI International, Durham, NC, USA.Programa de Pós-Graduação em Ciências da Saúde (PPGCS) da Universidade de Pernambuco, Microcephaly Epidemic Research Group, Recife, Brazil.Fundação Oswaldo Cruz. Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira. Rio de Janeiro, RJ, Brasil.Ribeirão Preto Medical School, Ribeirão Preto, Brazil.Instituto de Medicina Tropical Alexander von Humboldt and Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru.Department of Pathobiological Sciences, University of Wisconsin, Madison, WI, USA.Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Salvador, BA, Brasil / Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, USA.Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, 38105, USA.Department of Epidemiology, Harvard Chan School of Public Health, Boston, MA, USA.Social, Statistical and Environmental Sciences, RTI International, Durham, NC, USA.Instituto de Medicina Tropical Alexander von Humboldt and Facultad de Medicina, Universidad Peruana Cayetano Heredia, Lima, Peru.University of Puerto Rico, San Juan, Puerto Rico.Department of Epidemiology and Biostatistics, College of Public Health, University of Georgia, Athens, GA, USA.University of Puerto Rico, San Juan, Puerto Rico.Maternal-Infant Studies Center (CEMI), San Juan, Puerto Rico.Until recently, Zika virus (ZIKV) infections were considered mild and self-limiting. Since 2015, they have been associated with an increase in microcephaly and other birth defects in newborns. While this association has been observed in case reports and epidemiological studies, the nature and extent of the relationship between ZIKV and adverse pregnancy and pediatric health outcomes is not well understood. With the unique opportunity to prospectively explore the full spectrum of issues related to ZIKV exposure during pregnancy, we undertook a multi-country, prospective cohort study to evaluate the association between ZIKV and pregnancy, neonatal, and infant outcomes