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Romo JA, Aguilera PA, López A, Pedraza M, Figueroa C. Experience in colorectal surgery at a quaternary care hospital in Bogotá, Colombia. Rev Gastroenterol Mex (Engl Ed) 2023; 88:214-219. [PMID: 35525791 DOI: 10.1016/j.rgmxen.2021.08.013] [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] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 08/19/2021] [Indexed: 10/18/2022]
Abstract
INTRODUCTION AND AIMS Colorectal cancer is among the three most common cancers worldwide. Knowledge and identification of suboptimal outcome-associated factors enable comprehensive patient management. The aim of the present study was to present the results of the surgical management of colorectal cancer at a quaternary care university hospital. MATERIALS AND METHODS An observational, analytic, cross-sectional study was conducted. Information was collected on a retrospective cohort of patients diagnosed with colorectal cancer from 2013 to 2017 at the Hospital Universitario Mayor Méderi, Bogotá, Colombia. RESULTS Data on 452 patients, within the study period, were collected. A total of 48.5% of the patients were men, the overall complication rate was 24%, the surgical site infection (SSI) rate was 15.38%, anastomotic dehiscence occurred in 4.18% of the patients, bleeding required reoperation in 1.32%, and the intrahospital mortality rate was 7.47%. CONCLUSION Colorectal cancer management at a university hospital was as beneficial as that provided by other types of hospitals, showing a direct association with complete R0 dissections; low complication rates, according to international reports; and reduced overall morbidity.
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Affiliation(s)
- J A Romo
- Departamento Cirugía General, Universidad del Rosario, Bogotá DC, Colombia.
| | - P A Aguilera
- Departamento de Epidemiología, Hospital Universitario Mayor Méderi, Bogotá DC, Colombia
| | - A López
- Departamento de Medicina, Universidad del Rosario, Bogotá DC, Colombia
| | - M Pedraza
- Departamento Cirugía General, Universidad El Bosque, Bogotá DC, Colombia
| | - C Figueroa
- Departamento de Cirugía Colorrectal, Hospital Universitario Mayor Méderi, Bogotá DC, Colombia
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2
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Fuentes P, Ramos I, Stuardo A, Diaz F, Sánchez F, Torres C, Rojas A, Maldonado R, Córdova L, Burgos P, Pavicic F, Figueroa C, Ehrenfeld P. P034 KLK4 in luminal breast cancer progression. Breast 2023. [DOI: 10.1016/s0960-9776(23)00153-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023] Open
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3
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Figueroa C, Villafuerte M, Straube B, Ferreyra J, Navarro C, Runco Leal V, Bridoux G. The role of defects in the persistent photoconductivity of BaSnO 3thin films. J Phys Condens Matter 2023; 35:165301. [PMID: 36796107 DOI: 10.1088/1361-648x/acbcb7] [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] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Time-dependent photoconductivity (PC) and PC spectra have been studied in oxygen deficient BaSnO3thin films grown on different substrates. X-ray spectroscopy measurements show that the films have epitaxially grown on MgO and SrTiO3substrates. While on MgO the films are nearly unstrained, on SrTiO3the resulting film is compressive strained in the plane. Electrical conductivity in dark is increased in one order of magnitude for the films on SrTiO3in comparison to the one on MgO. This leads to an increase of PC in the latter film in at least one order of magnitude. PC spectra show a direct gap with a value ofEG=3.9eV for the film grown on MgO while on SrTiO3EG=3.36eV. For both type of films, time-dependent PC curves show a persistent behavior after illumination is removed. These curves have been fitted employing an analytical procedure based on the frame of PC as a transmission phenomenon showing the relevant role of donor and acceptor defects as carrier traps and as a source of carriers. This model also suggests that in the BaSnO3film on SrTiO3more defects are created probably due to strain. This latter effect can also explain the different transition values obtained for both type of films.
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Affiliation(s)
- C Figueroa
- Laboratorio de Física del Sólido, INFINOA (CONICET-UNT), Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, 4000 San Miguel de Tucumán, Argentina
| | - M Villafuerte
- Laboratorio de Física del Sólido, INFINOA (CONICET-UNT), Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, 4000 San Miguel de Tucumán, Argentina
| | - B Straube
- Laboratorio de Física del Sólido, INFINOA (CONICET-UNT), Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, 4000 San Miguel de Tucumán, Argentina
| | - J Ferreyra
- Laboratorio de Física del Sólido, INFINOA (CONICET-UNT), Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, 4000 San Miguel de Tucumán, Argentina
| | - C Navarro
- Institute of Inorganic Chemistry, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, 4000 San Miguel de Tucumán, Argentina
| | - V Runco Leal
- Institute of Inorganic Chemistry, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, 4000 San Miguel de Tucumán, Argentina
| | - G Bridoux
- Laboratorio de Física del Sólido, INFINOA (CONICET-UNT), Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, 4000 San Miguel de Tucumán, Argentina
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Gomez Peña M, Papayannis M, De Martino E, Filardi P, Magri L, Chiarello JM, Figueroa C, De Zuñiga I, Kopcow L, Horton M, Sobral F, Oubiña A, Bisioli C. O-077 The chromosomal constitution of embryos developing from 0PN zygotes. Hum Reprod 2022. [DOI: 10.1093/humrep/deac104.091] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Study question
To compare the ploidy status of embryos originated from zygotes with absence of pronuclei (0PN) with those developing from normal two pronuclei (2PN) fertilization.
Summary answer
We did not find significant differences in euploidy rates between blastocysts from 0PN and 2PN zygotes.
What is known already
Information regarding the ploidy number of 0PN zygotes, even when the pronuclei number is assessed by time-lapse microscope coupled incubators, is still insufficient. Because of this, embryos originating from 0PN zygotes are usually discarded or individualized in order not to include them in first transfers. Even more, abnormal fertilization is considered as a proxy of poor embryo quality.
Study design, size, duration
A retrospective observational study from March 2016 and December 2021 including 80 PGT-A cycles in which at least one of the blastocysts studied developed from oocytes in which pronuclei were not seen at the time of fertilization check.
Participants/materials, setting, methods
307 blastocysts were studied, of which 115 originated from 0PN and 192 from 2PN zygotes. Pronuclear number was assessed 16-20 h after insemination. Zygotes with 0PN were cultured separately from 2PN ones of the same cohort. After extended culture, a biopsy was performed and the material obtained was genetically studied using Next Generation Sequencing. Statistical comparisons were made with Fisher's exact and Chi-square tests. Significance level was set at P<0.05.
Main results and the role of chance
No differences were observed in euploidy rates between the 2PN and 0PN groups [55.2% (106/193) VS 43.5% (50/115)]. In aneuploid embryos originating from 2PN zygotes, a similar amount of trisomies and monosomies was observed (56 and 56 respectively). In contrast, aneuploid embryos from 0PN oocytes showed a greater number of trisomies than monosomies (55 and 35 respectively, P < 0.05). None of the blastocysts resulting from 0PN was haploid, that is, we did not find parthenogenic embryos. Blastocysts derived from 0PN zygotes showed similar quality scoring than those from 2PN ones. To date, 20 euploid blastocysts from the 0PN group have been transferred, producing 12 pregnancies: 6 still ongoing and 4 healthy live births.
Limitations, reasons for caution
Non-visualization of pronuclei in oocytes that later generate normal diploid blastocysts may be due to a faster or slower cell cycle progression. Modifications in the daily fertilization check schedules of busy laboratories should also be considered.
Wider implications of the findings
Contrary to expectations, aneuploid embryos from 0PN oocytes showed a greater number of trisomies than monosomies. A significant fraction of the embryos generated from 0PN zygotes were actually diploid, with similar quality and outcome results than 2PN ones. This makes them perfectly usable in IVF routines.
Trial registration number
Not applicable
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Affiliation(s)
- M Gomez Peña
- Pregna Medicina Reproductiva, ART Laboratory, Buenos Aires , Argentina
| | - M Papayannis
- Pregna Medicina Reproductiva, ART Laboratory, Buenos Aires , Argentina
| | - E De Martino
- Pregna Medicina Reproductiva, ART Laboratory, Buenos Aires , Argentina
| | - P Filardi
- Pregna Medicina Reproductiva, ART Laboratory, Buenos Aires , Argentina
| | - L Magri
- Pregna Medicina Reproductiva, ART Laboratory, Buenos Aires , Argentina
| | - J M Chiarello
- Pregna Medicina Reproductiva, ART Laboratory, Buenos Aires , Argentina
| | - C Figueroa
- Pregna Medicina Reproductiva, ART Laboratory, Buenos Aires , Argentina
| | - I De Zuñiga
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit, Buenos Aires , Argentina
| | - L Kopcow
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit, Buenos Aires , Argentina
| | - M Horton
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit, Buenos Aires , Argentina
| | - F Sobral
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit, Buenos Aires , Argentina
| | - A Oubiña
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit, Buenos Aires , Argentina
| | - C Bisioli
- Pregna Medicina Reproductiva, ART Laboratory, Buenos Aires , Argentina
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5
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Filardi P, De Martino E, Chiarello Sosa J, Gomez Peña M, Papayannis M, Figueroa C, Magri L, Oubiña A, Horton M, De Zuñiga I, Kopcow L, Sobral F, Bisioli C. P-223 Women aged 40 or older and non-male factor have the same reproductive outcome using intracytoplasmic sperm injection (ICSI) or conventional in vitro fertilization (cIVF). Hum Reprod 2022. [DOI: 10.1093/humrep/deac107.215] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Study question
Do women aged 40 or older have the same reproductive outcome using ICSI or cIVF when male factor infertility is not present?
Summary answer
Women aged 40 or older with non-male factor partners achieved similar reproductive outcomes either with ICSI or cIVF.
What is known already
Although initially proposed to treat couples with severe male factor infertility, ICSI has become the preferred tool to treat patient populations others than initially intended. Many studies and international forums, however, have alerted that its overuse is not free due to its safety, cost and time-consuming concerns. Moreover, it was noted that it does not increase clinical outcomes even in cases of compromised oocyte factor such as poor responder patients or few oocytes retrieved. However, there is still no information regarding its use in the group of patients of advanced reproductive age.
Study design, size, duration
Retrospective cohort study including 412 women aged 40 or older with non-male factor infertility performing ICSI or cIVF between May 2015 and October 2017.
Participants/materials, setting, methods
Patients underwent ICSI (n = 109) or cIVF (n = 303) according to medical indication. The decision to use ICSI in non-male factor patients was merely operational, with the objective of evaluating oocyte maturity.Those cycles with own oocytes, non-male factor and fresh embryo transfers were included. Semen samples were considered normal following the World Health Organization fifth edition sperm parameters values, and prepared by density gradient selection.
Main results and the role of chance
The primary outcome was clinical pregnancy rate. Secondary outcomes included ongoing pregnancy, miscarriage and implantation rates. Statistical significance was denoted by P < 0.05. The mean age of the women were 41.4 in the ICSI group and 41.6 years in the cIVF group, while the mean age for male couple was 43.6 and 41.6 respectively.
No differences between ICSI and cIVF groups were observed regarding clinical pregnancy [16.5% (18/109) vs. 20.8% (63/303)], ongoing pregnancy [9.2% (10/109) vs. 7.9% (24/303)], miscarriage [41.2% (7/17) vs. 46,5% (20/43)], and implantation rates [11.3% (17/151) vs. 9.9% (50/506)].
Limitations, reasons for caution
These results need confirmation with a bigger population size. As with any retrospective study, the potential for residual confounding exists.
Wider implications of the findings
These data suggest that ICSI offers no clinical benefit for women aged 40 and older with non-male factor infertility, beyond oocyte maturation classification.
Trial registration number
not applicable
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Affiliation(s)
- P Filardi
- Pregna Medicina Reproductiva, Embryology Lab , Buenos Aires, Argentina
| | - E De Martino
- Pregna Medicina Reproductiva, Embryology Lab , Buenos Aires, Argentina
| | | | - M Gomez Peña
- Pregna Medicina Reproductiva, Embryology Lab , Buenos Aires, Argentina
| | - M Papayannis
- Pregna Medicina Reproductiva, Embryology Lab , Buenos Aires, Argentina
| | - C Figueroa
- Pregna Medicina Reproductiva, Embryology Lab , Buenos Aires, Argentina
| | - L Magri
- Pregna Medicina Reproductiva, Embryology Lab , Buenos Aires, Argentina
| | - A Oubiña
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit , Buenos Aires, Argentina
| | - M Horton
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit , Buenos Aires, Argentina
| | - I De Zuñiga
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit , Buenos Aires, Argentina
| | - L Kopcow
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit , Buenos Aires, Argentina
| | - F Sobral
- Pregna Medicina Reproductiva, Department of Gynaecology and In Vitro Fertilisation Unit , Buenos Aires, Argentina
| | - C Bisioli
- Pregna Medicina Reproductiva, Embryology Lab , Buenos Aires, Argentina
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Figueroa C, Yang H, DiSpirito J, Bourgeois JR, Kalyanasundaram G, Doshi I, Bilbo SD, Kopec AM. Morphine exposure alters Fos expression in a sex-, age-, and brain region-specific manner during adolescence. Dev Psychobiol 2021; 63:e22186. [PMID: 34423851 DOI: 10.1002/dev.22186] [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: 04/29/2021] [Revised: 07/17/2021] [Accepted: 08/08/2021] [Indexed: 11/06/2022]
Abstract
Data in both humans and preclinical animal models clearly indicate drug exposure during adolescence, when the "reward" circuitry of the brain develops, increases the risk of substance use and other mental health disorders later in life. Human data indicate that different neural and behavioral sequelae can be observed in early versus late adolescence. However, most studies with rodent models examine a single adolescent age compared to a mature adult age, and often only in males. Herein, we sought to determine whether the acute response to the opioid morphine would also differ across adolescence, and by sex. By quantifying Fos positive cells, a proxy for neural activity, at different stages during adolescence (pre-, early, mid-, and late adolescence) and in multiple reward regions (prefrontal cortex, nucleus accumbens, caudate/putamen), we determined that the neural response to acute morphine is highly dependent on adolescent age, sex, and brain region. These data suggest that heterogeneity in the consequences of adolescent opioid exposure may be due to age- and sex-specific developmental profiles in individual reward processing regions. In future studies, it will be important to add age within adolescence as an independent variable for a holistic view of healthy or abnormal reward-related neural development.
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Affiliation(s)
- C Figueroa
- Deptartment of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, USA
| | - H Yang
- Deptartment of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, USA.,Northeastern University, Boston, MA, USA
| | - J DiSpirito
- Deptartment of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, USA.,Rensselaer Polytechnic Institute, Troy, NY, USA
| | - J R Bourgeois
- Deptartment of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, USA
| | - G Kalyanasundaram
- Deptartment of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, USA
| | - I Doshi
- Deptartment of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, USA
| | - S D Bilbo
- Deptartment of Psychology and Neuroscience, Duke University, Durham, NC, USA.,Deptartment of Pediatrics, Massachusetts General Hospital, Boston, MA, USA.,Lurie Center for Autism, Harvard Medical School, Boston, MA, USA
| | - A M Kopec
- Deptartment of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, USA.,Deptartment of Pediatrics, Massachusetts General Hospital, Boston, MA, USA.,Lurie Center for Autism, Harvard Medical School, Boston, MA, USA
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7
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Bourgeois JR, Kalyanasundaram G, Figueroa C, Srinivasan A, Kopec AM. A semi-automated brain atlas-based analysis pipeline for c-Fos immunohistochemical data. J Neurosci Methods 2020; 348:108982. [PMID: 33091429 DOI: 10.1016/j.jneumeth.2020.108982] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/23/2020] [Accepted: 10/14/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND The use of immunohistochemistry to quantify neural markers in various brain regions is a staple of neuroscience research. Numerous programs exist to automate quantification, but manual assignment of regions of interest (ROIs) within individual brain sections remains time consuming and can introduce interobserver variability. NEW METHOD We have developed a novel open source FIJI-based immunohistochemical data analysis pipeline, Atlas-Based Analysis (ABA). ABA uses landmark-based image warping to adjust the experimental image to closely align with a published rat brain atlas. c-Fos positive cells are then quantified within predetermined ROI coordinates derived from the brain atlas. Image warping adjusts for natural variation in brain sections to ensure reliable alignment of ROIs for data analysis. This pipeline can be adapted for new atlases, landmarks, ROIs, and quantification measurements. RESULTS ABA permits rapid quantification of immunoreactivity in multiple ROIs and produces results with high levels of interobserver consistency. COMPARISON WITH EXISTING METHODS Compared to manual ROI designation, ABA reduces total analysis time by ∼70%. With correct use of landmarks for image warping, ABA produces similar results to manually drawn ROIs, results in no interobserver variability, and maintains c-Fos+ pixel dimensions. CONCLUSIONS ABA reduces time to obtain reliable results when performing automated immunoreactivity quantification and allows multiple users to analyze data without compromising the reliability of data obtained.
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Affiliation(s)
- J R Bourgeois
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany NY, United States
| | - G Kalyanasundaram
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany NY, United States; Rensselaer Polytechnic Institute, Troy, NY, United States
| | - C Figueroa
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany NY, United States
| | - A Srinivasan
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany NY, United States
| | - A M Kopec
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany NY, United States.
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8
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Grigorian A, Lester E, Lekawa M, Figueroa C, Kuza CM, Dolich M, Schubl SD, Barrios C, Nahmias J. Marijuana use and outcomes in adult and pediatric trauma patients after legalization in California. Am J Surg 2019; 218:1189-1194. [PMID: 31521241 DOI: 10.1016/j.amjsurg.2019.08.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 08/20/2019] [Accepted: 08/27/2019] [Indexed: 12/31/2022]
Abstract
BACKGROUND Marijuana has become legal in eight states since 2012. We hypothesized the incidence of marijuana-positive trauma patients and rate of mortality has increased post-legalization. METHODS A single level-I trauma center was used to identify patients screening positive for marijuana on urine-toxicology. Patients in the pre-legalization and post-legalization periods were compared. RESULTS In the pre-legalization cohort 9.4% were marijuana-positive versus 11.0% in the post-legalization cohort (p = 0.001). Marijuana-positive patients post-legalization had higher rates of critical trauma activation (20.0% vs. 15.0%, p = 0.01) and mortality (2.6% vs. 1.2%, p = 0.03). In the pediatric (age 12-17) subgroup, the incidence of marijuana-positive patients did not change after legalization (pre: 39.3%, post: 46.4%, p = 0.24). CONCLUSION The incidence of marijuana-positive trauma patients increased post-legalization. Adult marijuana-positive trauma patients post-legalization were more likely to meet criteria for critical trauma activation and have a higher mortality rate. A subgroup of pediatric patients had an alarmingly high rate of marijuana use. SUMMARY The rate of marijuana use among trauma patients increased post-legalization in California. The rate of critical trauma activation also increased as well as the mortality rate.
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Affiliation(s)
- A Grigorian
- University of California, Irvine, Department of Surgery, Division of Trauma, Burns and Surgical Critical Care, Orange, CA, USA.
| | - E Lester
- University of California, Irvine, Department of Surgery, Division of Trauma, Burns and Surgical Critical Care, Orange, CA, USA
| | - M Lekawa
- University of California, Irvine, Department of Surgery, Division of Trauma, Burns and Surgical Critical Care, Orange, CA, USA
| | - C Figueroa
- University of California, Irvine, Department of Surgery, Division of Trauma, Burns and Surgical Critical Care, Orange, CA, USA
| | - C M Kuza
- University of Southern California, Department of Anesthesia, Los Angeles, CA, USA
| | - M Dolich
- University of California, Irvine, Department of Surgery, Division of Trauma, Burns and Surgical Critical Care, Orange, CA, USA
| | - S D Schubl
- University of California, Irvine, Department of Surgery, Division of Trauma, Burns and Surgical Critical Care, Orange, CA, USA
| | - C Barrios
- University of California, Irvine, Department of Surgery, Division of Trauma, Burns and Surgical Critical Care, Orange, CA, USA
| | - J Nahmias
- University of California, Irvine, Department of Surgery, Division of Trauma, Burns and Surgical Critical Care, Orange, CA, USA
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Reyes G, Rodriguez-Serrano D, Chicot-Llano M, Leal O, Figueroa C, Mingo A. Leiomiosarcoma de arteria pulmonar: una enfermedad infrecuente y de difícil diagnóstico. Med Intensiva 2016; 40:64-5. [DOI: 10.1016/j.medin.2015.03.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 03/24/2015] [Accepted: 03/24/2015] [Indexed: 11/28/2022]
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10
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Bravo J, Carbonell V, Valdebenito JT, Figueroa C, Valdovinos CE, Martín-Hernández R, Higes M, Delporte C. Identification of Nosema ceranae in the Valparaíso District, Chile. ACTA ACUST UNITED AC 2014. [DOI: 10.4067/s0301-732x2014000300021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Belmonte M, Hsieh CF, Figueroa C, Campos J, Vidal G. Effect of free ammonia nitrogen on the methanogenic activity of swine wastewater. ELECTRON J BIOTECHN 2011. [DOI: 10.2225/vol14-issue3-fulltext-11] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
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Wiard RM, Kim HJ, Figueroa C, Kovacs GTA, Taylor CA, Giovangrandi L. Estimation of central aortic forces in the ballistocardiogram under rest and exercise conditions. Annu Int Conf IEEE Eng Med Biol Soc 2010; 2009:2831-4. [PMID: 19964271 DOI: 10.1109/iembs.2009.5333577] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The ballistocardiogram (BCG) signal represents the movements of the body in response to cardiac ejection of blood. The BCG signal can change considerably under various physiological states; however, little information exists in literature describing how these forces are generated. A physical analysis is presented using a finite element model of thoracic aortic vasculature to quantify forces generated by the blood flow during the cardiac cycle. The traction at the fluid-solid interface of this deformable wall model generates a Central Aortic Force (CAF) which appears of similar magnitude to recorded BCG forces. The increased pulse pressure in an exercise simulation caused a significant increase in CAF, which is consistent with recent BCG measurements in exercise recovery.
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Affiliation(s)
- Richard M Wiard
- Bioengineering Department, Stanford University, Stanford, CA 94305, USA.
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Wu P, Ozturk SS, Blackie JD, Thrift JC, Figueroa C, Naveh D. Evaluation and applications of optical cell density probes in mammalian cell bioreactors. Biotechnol Bioeng 2009; 45:495-502. [PMID: 18623249 DOI: 10.1002/bit.260450606] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
On-line optical cell density probes were implemented to continuously monitor the cell densities in mammalian cell bioreactor and to achieve advanced bioreactor controls. We tested cell density probes from six manufacturers in high cell density bioreactors. When externally calibrated, Aquasant and Ingold backscattering probes produced the most linear probe responses (PR) versus cell density (CD), followed by the ASR and Cerex laser probes. Monitek and Wedgewood transmission probes had lower resolutions. All probes were tested in two murine hybridoma fermentations. Cell densities varied between 1 x 10(6) cells/mL to 20 x 10(6) cells/mL and the bioreactors were operated for 5 to 7 weeks. For our bioreactors, Aquasant, Ingold, ASR, Wedgewood, and Monitek probes gave satisfactory responses. Little fouling was observed with any probe at the end of 2 weeks. Fouling was a possibility after 3 weeks in one bioreactor but its effect can be easily corrected. Cell density control and specific perfusion control of bioreactors based on the Aquasant probe were achieved. Implementation of cell density probe based perfusion control, instead of "step perfusion adjustments" based on manual hemacytometer control, will result in smoother operation, healthier cultures, increased medium delivery efficiency, and reduced operational excursions.
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Affiliation(s)
- P Wu
- Miles Biotechnology, Building 46, 4th and Parker Streets, PO Box 1986, Berkeley, California 94701, USA
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Bonduel M, Staciuk R, Figueroa C, Oleastro M, Gamba C, Rossi J, del Pozo A. Unrelated cord blood transplantation and reduced-intensity conditioning regimen for graft failure in a child with Major Histocompatibility Complex class II deficiency. Bone Marrow Transplant 2008; 43:817-8. [DOI: 10.1038/bmt.2008.399] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Gruendler T, Cavanagh J, Figueroa C, Frank M, Allen J. Task related dissociation in performance monitoring as a function of obsessive–compulsive symptoms. Int J Psychophysiol 2008. [DOI: 10.1016/j.ijpsycho.2008.05.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Figueroa C, Schwarz U, Kurths J, Postnova S, Braun H, Hemmeter U. Analysis of Sleep-EEG from Depressed Patients. Pharmacopsychiatry 2007. [DOI: 10.1055/s-2007-991836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Barbiere J, Beninati G, Figueroa C, Hanley J. SU-FF-J-42: Analytical Image Guided Radiotherapy for Head and Neck. Med Phys 2007. [DOI: 10.1118/1.2760547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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18
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Bonduel M, Zelazko M, Figueroa C, Magaldi G, Rossi J, del Pozo A. Successful treatment of autoimmune hemolytic anemia with rituximab in a child with severe combined immunodeficiency following nonidentical T-cell-depleted bone marrow transplantation. Bone Marrow Transplant 2005; 35:819-21. [PMID: 15750606 DOI: 10.1038/sj.bmt.1704885] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Affiliation(s)
- S M Graham
- Zoological Institute, Zurich University, Zurich, Switzerland
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Abstract
Localization of Ras and Ras-like proteins to the correct subcellular compartment is essential for these proteins to mediate their biological effects. Many members of the Ras superfamily (Ha-Ras, N-Ras, TC21, and RhoA) are prenylated in the cytoplasm and then transit through the endomembrane system on their way to the plasma membrane. The proteins that aid in the trafficking of the small GTPases have not been well characterized. We report here that prenylated Rab acceptor protein (PRA1), which others previously identified as a prenylation-dependent receptor for Rab proteins, also interacts with Ha-Ras, RhoA, TC21, and Rap1a. The interaction of these small GTPases with PRA1 requires their post-translational modification by prenylation. The prenylation-dependent association of PRA1 with multiple GTPases is conserved in evolution; the yeast PRA1 protein associates with both Ha-Ras and RhoA. Earlier studies reported the presence of PRA1 in the Golgi, and we show here that PRA1 co-localizes with Ha-Ras and RhoA in the Golgi compartment. We suggest that PRA1 acts as an escort protein for small GTPases by binding to the hydrophobic isoprenoid moieties of the small GTPases and facilitates their trafficking through the endomembrane system.
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Affiliation(s)
- C Figueroa
- Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
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Abstract
Peroxisomes are essential subcellular organelles, which appear to be derived from pre-existing organelles. This biogenetic mechanism assumes the presence of peroxisomes in either or both mammalian gametes (sperms and/or oocytes). In order to test the presence and subcellular localization of peroxisomal proteins in rat sperms and oocytes, the authors carried out fractionation and immunofluorescence experiments. The results showed that rat oocytes contain peroxisome-like structures, which were detected by indirect immunofluorescence, using an antisera against total peroxisomal proteins. In contrast, such structures were not detected in rat sperms, which appear to contain catalase localized in the cell cytosol. The results reported herein show evidence for the first time of the presence of peroxisome-like structures in mammalian oocytes, and provide evidence for the peroxisome biogenesis hypothesis, by division of pre-existing organelles.
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Affiliation(s)
- C Figueroa
- Department of Cell and Molecular Biology, Faculties of Biological Sciences and Medicine, P. Catholic University of Chile, Santiago, Chile
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Nogales-Gaete J, Núñez L, Arriagada C, Sáez D, Figueroa T, Fernández R, González J, Aragón A, Barrientos N, Varas P, Troncoso B, Cárcamo C, Chávez M, Gumucio M, Holmgrenn P, Beltrán G, San Martín E, Manríquez E, Figueroa C. [Clinical characterization of 450 patients with cerebrovascular disease admitted to a public hospital during 1997]. Rev Med Chil 2000; 128:1227-36. [PMID: 11347510] [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: 04/16/2023]
Abstract
BACKGROUND In Chile, cerebrovascular diseases are the fifth cause of death among men and the third cause among women. AIM To assess the clinical features and management of patients with cerebrovascular disease admitted to a public hospital during 1997. PATIENTS AND METHODS A retrospective analysis of clinical records of patients discharged with a diagnosis of cerebrovascular disease. Those records in which there was discordance between the discharge diagnosis and the clinical picture were not considered in the analysis. RESULTS Of the 563 discharges from the hospital with the diagnosis of cerebrovascular disease, 487 records were located and 450 were considered in the analysis. Fifty four percent of patients were male and ages ranged from 17 to 96 years old. Fifty-one percent of patients had an ischemic stroke, 34% a cerebral hemorrhage, 12% a subarachnoidal hemorrhage and 3% a transient ischemic attack. There was a history of hypertension in 64% patients and 20% had an adequate treatment. Eighteen percent were diabetics, 34% had a heart disease and 20% had a previous episode of stroke. Mean hospital stay was 6.3 days in the emergency room and 11 days in the neurology ward. Hospital infections appeared in 21% of patients (respiratory in 68% and urinary in 22%), lethality was 30.5% and a CAT scan was done in 94%. At the moment of admission, 10% of patients had an evolution of less than 2 hours, 27% had an evolution between 2 and 6 hours and nine cases were potential eligible for thrombolysis. CONCLUSION This is a picture of the local features of patients with cerebrovascular diseases that can be used as a reference for future studies.
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Affiliation(s)
- J Nogales-Gaete
- Servicio de Neurología, Hospital Barros Luco-Trudeau, Departamento de Neurología, Facultad de Medicina, Universidad de Chile
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Abstract
B-Raf contains multiple Akt consensus sites located within its amino-terminal regulatory domain. One site, Ser(364), is conserved with c-Raf but two additional sites, Ser(428) and Thr(439), are unique to B-Raf. We have investigated the role of both the conserved and unique phosphorylation sites in the regulation of B-Raf activity in vitro and in vivo. We show that phosphorylation of B-Raf by Akt occurs at multiple residues within its amino-terminal regulatory domain, at both the conserved and unique phosphorylation sites. The alteration of the serine residues within the Akt consensus sites to alanines results in a progressive increase in enzymatic activity in vitro and in vivo. Furthermore, expression of Akt inhibits epidermal growth factor-induced B-Raf activity and inhibition of Akt with LY294002 up-regulates B-Raf activity, suggesting that Akt negatively regulates B-Raf in vivo. Our results demonstrate that B-Raf activity can be negatively regulated by Akt through phosphorylation in the amino-terminal regulatory domain of B-Raf. This cross-talk between the B-Raf and Akt serine/threonine kinases is likely to play an important role in modulating the signaling specificity of the Ras/Raf pathway and in promoting biological outcome.
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Affiliation(s)
- K L Guan
- Department of Biological Chemistry and the Institute of Gerontology, University of Michigan, Ann Arbor, Michigan 48109, USA
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González-Martín G, Figueroa C, Merino I, Osuna A. Allopurinol encapsulated in polycyanoacrylate nanoparticles as potential lysosomatropic carrier: preparation and trypanocidal activity. Eur J Pharm Biopharm 2000; 49:137-42. [PMID: 10704896 DOI: 10.1016/s0939-6411(99)00076-4] [Citation(s) in RCA: 31] [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: 11/19/2022]
Abstract
The activity of allopurinol-loaded polyethylcyanoacrylate nanoparticles against Trypanosoma cruzi was compared to that of free allopurinol using in vitro cultures of epimastigotes. Ethylcyanoacrylate nanoparticles were prepared by an emulsion polymerization process, and formulations containing different concentrations of allopurinol, polyethylcyanoacrylate and surfactants were investigated and analyzed in size and amount of drug entrapped. The nanoparticles obtained were less than 200 nm in size, as measured by electron microscopy and cytometry. The peak amount of allopurinol entrapped in the nanoparticles was 62.8+/-1.9 microg mg(-1) of nanoparticles using 400 microl of polyethylcyanoacrylate, 200 microl of surfactant (Tween 20) and 20 mg of allopurinol in 50 ml of polymerization medium and the association efficiency was 100.7%. After 6 h of incubation at pH 7.4 the release of allopurinol from the nanoparticles was 7.4%, while at pH 1.2 only 3.1% was released after 4-6 h (t=42.8, P<0.0001). The in vitro studies, using cultures of T. cruzi epimastigotes, demonstrated considerable increases in the trypanocidal activity of the allopurinol-loaded nanoparticles in comparison with a standard solution of allopurinol (91.5 vs. 45.9%) at an allopurinol concentration of 16.7 microg ml(-1). In addition, it was shown that the unloaded nanoparticles, by mechanisms not completely elucidated, had a trypanocidal activity similar to that of standard solutions of allopurinol. To study cytotoxicity, increasing concentrations of unloaded nanoparticles were incubated on vero-line cell cultures. The concentration that killed 50% cells was 200 microg ml(-1), four times higher than that necessary to kill 50% of T. cruzi. It is concluded that the polyethylcyanoacrylate nanoparticles constitute a good carrier of drugs against the T. cruzi. The allopurinol loaded-nanoparticles significantly increased the trypanocidal activity in comparison to the free drug.
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Rollan A, Giancaspero R, Fuster F, Acevedo C, Figueroa C, Hola K, Schulz M, Duarte I. The long-term reinfection rate and the course of duodenal ulcer disease after eradication of Helicobacter pylori in a developing country. Am J Gastroenterol 2000; 95:50-6. [PMID: 10638558 DOI: 10.1111/j.1572-0241.2000.01700.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the effect of Helicobacter pylori (H. pylori) eradication on the natural history of duodenal ulcer disease and the reinfection rate after treatment in a developing country. METHODS A total of 111 H. pylori-infected patients with duodenal ulcer were treated with either omeprazole or famotidine plus two antibiotics for 2 wk. Those failed to respond to treatment were retreated with bismuth-based triple therapy. RESULTS The radication rate was 76% (95% CI: 67-83%). Eventually, H. pylori was eradicated in 96 of the 111 patients (86%), who were followed-up clinically and endoscopically for a mean of 37.2 months. The cumulative reinfection rate after eradication (Kaplan-Meier) was 8%+/-3% in yr 1, 11%+/-4% in yr 2, and 13%+/-4% in yr 3. Nine of the 12 reinfections occurred during yr 1. Recurrence of duodenal ulcer was detected in five patients (5.2%), all of them during yr 1 of follow-up. Histologically, gastritis scores (according to the Sydney system) improved significantly after eradication. CONCLUSIONS In a high prevalence setting, H. pylori eradication and early reinfection rates after treatment are similar to rates observed in a low prevalence environment, whereas the late reinfection rate seems to be higher. However, up to 3 yr after treatment, most treated patients are free of H. pylori infection and/or ulcer activity. Even longer follow-up studies are necessary to determine whether specific retreatment policies are necessary to maintain long term eradication in developing countries.
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Affiliation(s)
- A Rollan
- Department of Gastroenterology and Pathology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago
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26
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Roa I, Ibacache G, Carvallo J, Melo A, Araya J, De Aretxabala X, Figueroa M, Barrientos F, Figueroa C. [Microbiological study of gallbladder bile in a high risk zone for gallbladder cancer]. Rev Med Chil 1999; 127:1049-55. [PMID: 10752267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
BACKGROUND Gallbladder cancer is frequent in Chile and there is sparse information about the association between this type of cancer and the presence of bacteria in the gallbladder bile. AIM To determine the presence of aerobic bacteria in gallbladder bile in patients with and without gallbladder cancer. MATERIAL AND METHODS A microbiological analysis of bile and pathological study was performed in 608 gallbladders, obtained during to cholecystectomies performed to 513 women and 95 men aged 44 years old as a mean. RESULTS Pathological study showed a chronic cholecystitis in 468 cases (77%), an acute cholecystitis in 140 (33%), cancer in 24 (3.9%) and dysplasia in 5 cases (0.8%). A positive culture was obtained in 22.5% of women and 28.5% of males. Twenty seven percent of women over 30 years old had positive cultures compared with 10% of younger women (p < 0.001). Thirty two percent of acute cholecystitis had positive cultures, compared with 24% of chronic cholecystitis (p = 0.03). E Coli was isolated in 51% of positive cases, Streptococci-Enterococci in 24%, Enterobacter sp in 9%, Klebsiella and Proteus in lower proportions. Salmonella sp was isolated in 4 cases, being all women with chronic cholecystitis. Thirteen of 29 cases with cancer or dysplasia had positive cultures (45%), compared with 25% of patients with inflammatory gallbladder diseases (p = 0.02). Streptococci-Enterococci were isolated in 7 cases and Enterobacter sp in three. CONCLUSIONS The presence of Salmonella sp in gallbladder bile was not frequent in the studied patients. Its role in the pathogenesis of gallbladder cancer must be reassessed.
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Bonduel M, Pozo A, Zelazko M, Raslawski E, Delfino S, Rossi J, Figueroa C, Sackmann Muriel F. Successful related umbilical cord blood transplantation for graft failure following T cell-depleted non-identical bone marrow transplantation in a child with major histocompatibility complex class II deficiency. Bone Marrow Transplant 1999; 24:437-40. [PMID: 10467337 DOI: 10.1038/sj.bmt.1701915] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [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: 10/27/2022]
Abstract
Major histocompatibility complex (MHC) class II deficiency is a rare form of primary combined immunodeficiency that can only be corrected by stem cell transplantation. We report a 4(1/2)-year-old girl with MHC class II deficiency who underwent a related CBT due to graft failure following T cell-depleted non-identical BMT. The patient is alive and well 2 years after the second transplant. A sustained hematopoietic engraftment and a progressive immune recovery have been detected. We conclude that cord blood may be an effective source of hematopoietic stem cells for patients with immuno- deficiency disorders including diseases with a high rate of graft failure.
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Affiliation(s)
- M Bonduel
- Department of Hematology/Oncology and Bone Marrow Transplant Unit, Hospital de Pediatría 'Prof Dr Juan P Garrahan', Buenos Aires, Argentina
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Abstract
OBJECTIVE The clinical usefulness of preoperative localization and intraoperative PTH assay (QPTH) in primary hyperparathyroidism have been established. However, without the use of QPTH, the parathyroidectomy failure rate remains 5% to 10% in large reported series and is probably much higher in the hands of less experienced parathyroid surgeons. Persistent hypercalcemia requires another surgical procedure. The authors compared the outcomes in 50 consecutive patients undergoing more difficult secondary parathyroidectomy with and without the adjunctive support of QPTH. METHODS Two groups of similar patients underwent reoperative parathyroidectomy for failed surgery or recurrent disease. The successful return to normocalcemia in group I, with QPTH used to localize and confirm complete excision of all hyperfunctioning glands, was compared with group II, who did not have this intraoperative adjunct. RESULTS In 31/33 patients in group I, calcium levels returned to normal. With good preoperative localization studies, 17 patients underwent successful straightforward parathyroidectomies as predicted by QPTH. In the other 14 patients, QPTH assay proved extremely beneficial by facilitating localization with differential venous sampling; measuring the increase in hormone secretion after massage of specific areas; recognizing suspicious nonparathyroid tissue excised without a decrease in hormone levels, avoiding frozen-section delay; and correctly identifying the excision of abnormal tissue despite false-positive/false-negative sestamibi scans. In group II, who underwent surgery before QPTH was available, 4 of 17 patients (24%) remained hypercalcemic after extensive reexploration. CONCLUSION With the intraoperative hormone assay used to facilitate localization and confirm excision of all hyperfunctioning tissue, the success rate of reoperative parathyroidectomy has improved from 76% to 94%.
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Affiliation(s)
- G L Irvin
- Department of Surgery, University of Miami School of Medicine, Jackson Memorial and Veterans Affairs Medical Centers, Florida 33101, USA
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29
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Bullorsky EO, Bonduel M, Shanley C, Figueroa C, Stemmelin G, Del Pozo A, Ceresetto J, Delfino S, Puppo M, Muriel FS. [Bone marrow transplantation for severe aplastic anemia]. Medicina (B Aires) 1998; 58:130-4. [PMID: 9706244] [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: 02/08/2023] Open
Abstract
Severe aplastic anemia is a hematological disease with a high mortality rate, for which bone marrow transplantation is the treatment of choice, specially in children and young adults. The number of transfusions undergone before the transplant is the most important factor to predict the possibility of graft failure. Twenty patients with severe aplastic anemia, most of them already multiple transfused, were transplanted utilizing cyclophosphamide combined with antilymphocyte globulin as a conditioning regiment. All the evaluable patients engrafted and there were no episodes of graft failure. Three patients died, and 17 (85%) are alive with hematopoietic recovery at a median of 27.7 months post-transplant. Bone marrow transplantation was an excellent therapeutic option in this series of patients with severe aplastic anemia and the conditioning regiment appeared to be sufficiently myeloablative and immunosuppressive to avoid early or late graft failure.
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Rollán A, Giancaspero R, Arrese M, Figueroa C, Vollrath V, Schultz M, Duarte I, Vial P. Accuracy of invasive and noninvasive tests to diagnose Helicobacter pylori infection after antibiotic treatment. Am J Gastroenterol 1997; 92:1268-74. [PMID: 9260787] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVES To compare the diagnostic accuracy of the most widely available tests for diagnosis of Helicobacter pylori infection after antibiotic treatment. METHODS A total of 59 H. pylori-positive, duodenal ulcer patients (mean age, 40.7 +/- 11.7 yr; 40 male and 19 female) were treated for 2 wk with either amoxicillin-metronidazole (n = 36) or omeprazole-amoxicillin-tinidazole (n = 23), and after 4 wk, were tested for H. pylori infection by [14C]urea breath test (UBT), serum IgG antibody level, and multiple antral biopsies for rapid urease testing, histology, Warthin-Starry stain, and polymerase chain reaction to detect H. pylori DNA. Infection status was established by a concordance of test results. RESULTS H. pylori was eradicated in 47 patients (80%). UBT and rapid urease testing had the best sensitivity and specificity, although not statistically different to Warthin-Starry stain and polymerase chain reaction. Serology and histology had little diagnostic value in this setting due to high proportion of false-positive results. CONCLUSIONS Noninvasive UBT is as accurate in predicting H. pylori status after antibiotic treatment as rapid urease testing and Warthin-Starry stain. Especially for duodenal ulcer patients, UBT could be considered the gold standard to confirm eradication of H. pylori.
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Affiliation(s)
- A Rollán
- Gastroenterology Department, Centro de Investigaciones Médicas, Faculty of Medicine, Catholic University of Chile, Santiago
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Abstract
To understand the regulation of rat uterine kallikrein, we evaluated its variations in animals that had been ovariectomized and supplemented with estradiol or progesterone, in pseudopregnant animals intraluminally oil-stimulated or unstimulated, and in unilaterally pregnant animals. The content of kallikrein, determined by an RIA highly specific for rK1 (true tissue kallikrein), rose in ovariectomized rats with estradiol supplementation (0.28 +/- 0.03 to 0.44 +/- 0.05 ng/mg) and decreased with progesterone (0.13 +/- 0.02 ng/mg; n = 15; p < 0.001). Kallikrein content rose from Day 1 of pseudopregnancy (PP1) to a maximum on PP7 (0.18 +/- 0.01 to 0.39 +/- 0.04 ng/mg protein; n = 36; p < 0.001). On PP7 with unilateral oil intraluminal stimulation, the decidualized horn had higher kallikrein content than did the contralateral (0.98 +/- 0.09 vs. 0.35 +/- 0.05 ng/mg protein; n = 7; p < 0.001). Immunocytochemistry revealed that mainly rK1 is localized in the luminal and glandular epithelium, and it increased in the stimulated horn. In the unilaterally pregnant rat on Day 7, the fertile horn had a higher kallikrein content than its contralateral control (0.71 +/- 0.07 vs. 0.37 +/- 0.03 ng/mg protein, p < 0.001; n = 8), as well as a higher kininogenase activity (239 +/- 34.3 vs. 83.5 +/- 7.9 ng bradykinin(BK)/h per horn, p < 0.003; and 945 +/- 90 vs. 585 +/- 40 ng BK/h per gram tissue, p < 0.002; n = 6). These results indicate that estrogen stimulates, whereas progesterone inhibits, kallikrein production, and that hormonal regulation is overridden by intraluminal stimulation, thus associating the enzyme with decidualization.
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Affiliation(s)
- J Corthorn
- Centro de Investigaciones Médicas, Facultad de Medicina, Pontificia Universidad Católica, Santiago, Chile
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Figueroa C, Davila A, Pourquié J. Original properties of ropy strains of Lactobacillus plantarum isolated from the sour cassava starch fermentation. J Appl Microbiol 1997. [DOI: 10.1111/j.1365-2672.1997.tb03298.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Affiliation(s)
- C Figueroa
- Departamento de Biología Celular y Molecular, Pontifica Universidad Católica, Santiago, Chile
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Pulst SM, Nechiporuk A, Nechiporuk T, Gispert S, Chen XN, Lopes-Cendes I, Pearlman S, Starkman S, Orozco-Diaz G, Lunkes A, DeJong P, Rouleau GA, Auburger G, Korenberg JR, Figueroa C, Sahba S. Moderate expansion of a normally biallelic trinucleotide repeat in spinocerebellar ataxia type 2. Nat Genet 1996; 14:269-76. [PMID: 8896555 DOI: 10.1038/ng1196-269] [Citation(s) in RCA: 742] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The gene for spinocerebellar ataxia type 2 (SCA2) has been mapped to 12q24.1. A 1.1-megabase contig in the candidate region was assembled in P1 artificial chromosome and bacterial artificial chromosome clones. Using this contig, we identified a CAG trinucleotide repeat with CAA interruptions that was expanded in patients with SCA2. In contrast to other unstable trinucleotide repeats, this CAG repeat was not highly polymorphic in normal individuals. In SCA2 patients, the repeat was perfect and expanded to 36-52 repeats. The most common disease allele contained (CAG)37, one of the shortest expansions seen in a CAG expansion syndrome. The repeat occurs in the 5'-coding region of SCA2 which is a member of a novel gene family.
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Affiliation(s)
- S M Pulst
- Rose Moss Laboratory for Parkinson's and Neurodegenerative Diseases, CSMC Burns and Allen Research Institute, Los Angeles, California, USA
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Wollants E, Schoenenberg M, Figueroa C, Shor-Posner G, Klaskala W, Baum MK. Risk factors and patterns of HIV-1 transmission in the El Salvador military during war time. AIDS 1995; 9:1291-2. [PMID: 8561989 DOI: 10.1097/00002030-199511000-00017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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36
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37
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Accatino L, Figueroa C, Pizarro M, Solís N. Enhanced biliary excretion of canalicular membrane enzymes in estrogen-induced and obstructive cholestasis, and effects of different bile acids in the isolated perfused rat liver. J Hepatol 1995; 22:658-70. [PMID: 7560859 DOI: 10.1016/0168-8278(95)80221-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
BACKGROUNDS/AIMS Canalicular membrane enzymes are normally released into bile by partially known processes. This study was undertaken to investigate whether hepatocellular cholestatis induced in rats by ethynylestradiol or obstructive cholestasis produced by complete biliary obstruction for 24 h is associated with an increased release of alkaline phosphatase and gamma-glutamyl transpeptidase into bile, and to clarify how this process is affected by different bile acids. METHODS The studies were performed in the isolated perfused liver during infusion of sodium taurocholate, taurochenodeoxycholate and tauroursodeoxycholate at increasing rates. RESULTS Maximum sodium taurocholate, taurochenodeoxycholate and tauroursodeoxycholate secretory rates were decreased in both cholestatic groups (complete biliary obstruction > ethynylestradiol) compared with controls. Maximum biliary outputs of alkaline phosphatase and gamma-glutamyl transpeptidase were significantly increased in the ethynylestradiol group during infusion of sodium taurocholate and taurochenodeoxycholate, but not of tauroursodeoxycholate, and were increased in the complete biliary obstruction group during the infusion of sodium taurocholate and tauroursodeoxycholate but not of taurochenodeoxycholate. The biliary outputs of alkaline phosphatase and gamma-glutamyl transpeptidase showed a significant and direct linear relationship with sodium taurocholate and taurochenodeoxycholate secretory rates in both cholestatic groups. However, only in the complete biliary obstruction group did alkaline phosphatase and gamma-glutamyl transpeptidase excretion show a significant correlation with tauroursodeoxycholate secretory rates. The slope of the line, which indicated the mU of enzyme activity secreted per nmol of sodium taurocholate or taurochenodeoxycholate, was greater for gamma-glutamyl transpeptidase and alkaline phosphatase in both cholestatic groups (ethynylestradiol > complete biliary obstruction) than in the control group. Alkaline phosphatase activity in purified isolated canalicular and sinusoidal membranes was significantly increased in both cholestatic groups (complete biliary obstruction > ethynylestradiol), while gamma-glutamyl transpeptidase activity was unchanged compared with controls. CONCLUSION The marked increase in sodium taurocholate and taurochenodeoxycholate-mediated release of alkaline phosphatase and gamma-glutamyl transpeptidase into bile in cholestatic rats suggests an increased lability of these intrinsic membrane proteins to the detergent effects of secreted bile acids. It remains to be elucidated whether this phenomenon, which was particularly intense in ethynylestradiol induced cholestasis, is important in the pathogenesis and perpetuation of bile secretory failure. In contrast, tauroursodeoxycholate administration did not result in enhanced biliary excretion of these membrane enzymes, in either the control group or the ethynylestradiol group, supporting the concept that this bile salt lacks the membrane toxicity of common bile acids.
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Affiliation(s)
- L Accatino
- Departamento de Gastroenterologia, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago de Chile
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Rehbock J, Buchinger P, Hermann A, Figueroa C. Identification of immunoreactive tissue kallikrein in human ductal breast carcinomas. J Cancer Res Clin Oncol 1995; 121:64-8. [PMID: 7860622 DOI: 10.1007/bf01202732] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Various proteases have been shown to be present in malignant breast tissue. Although the question of the involvement of tissue kallikrein, a serine protease, in the pathophysiology of tumours has been raised, the presence of this enzyme in human breast carcinoma has so far not been examined. In the present study, both neoplastic and normal human breast are scanned by immunocytochemistry for the presence and cellular localization of tissue kallikrein. In the healthy breast, tissue kallikrein was observed as a deposit of immunoreactive material that localized in the apical portion of duct cells. In the malignant breast tumours surveyed, the enzyme was observed only in ductal carcinomas, whereas lobular carcinomas were devoid of immunostaining. In ductal carcinomas, the immunoreactivity for tissue kallikrein appeared to be associated with gradations of malignancy, being absent in dedifferentiated tumours. The presence of tissue kallikrein in malignant breast tumours poses the question of the role of this enzyme in malignant breast tissue. The enzyme may participate within the tissue either in proteolytic processes (it has been shown to activate procollagenase) or by enhancing vascularity or mitogenicity by the generation of kinins.
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Affiliation(s)
- J Rehbock
- I. Frauenklinik der Universität, München, Germany
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Santos MJ, Kawada ME, Espeel M, Figueroa C, Alvarez A, Hidalgo U, Metz C. Characterization of human peroxisomal membrane proteins. J Biol Chem 1994; 269:24890-6. [PMID: 7929170] [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: 01/27/2023] Open
Abstract
The peroxisomal membrane appears to play a crucial role in transporting proteins into the organelle. Some human genetic disorders involving peroxisome biogenesis, such as Zellweger syndrome, may be caused by genetic defects of the import machinery located in the peroxisomal membrane. In order to characterize the proteins of the human peroxisomal membrane, we isolated peroxisomes from human liver. We obtained their membranes using various procedures and analyzed their proteins by SDS-polyacrylamide gel electrophoresis and silver staining. We compared the protein composition of peroxisomal membranes with membranes derived from mitochondria and microsomes. The main peroxisomal membrane proteins (PMPs) have apparent molecular masses of 147, 112, 95, 87, 81, 79, 74, 69(70), 53-52 (double band), 47, 45, 43, 37, 31, 28, 22, and 17 kDa. The following PMPs of 147, 112, 79, 69(70), 53-52 (double band), 47, 43, 31, 28, 22, and 17 kDa fit the criteria for integral membrane proteins. We then produced rabbit polyclonal and mouse monoclonal antibodies that recognized some human PMPs. One of these antibodies detected mainly PMP43. We used this antiserum to evaluate the presence and subcellular distribution of the PMP43 in fibroblasts derived from patients affected by Zellweger syndrome. These results represent new information about the protein composition of the human peroxisomal membrane and provide biological tools for further characterization of the human PMPs and their genes in normal and pathological conditions.
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Affiliation(s)
- M J Santos
- Department of Cell and Molecular Biology, Faculty of Biological Sciences, Pontificia Catholic University of Chile, Santiago
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Abstract
Cortical tubular cultures enriched with distal segments were prepared from the kidney of adult Fisher 344 rats bearing thyroid tumors. After two years of cultivation (20 passages) cell monolayers contained immunocytochemically detectable cytokeratin and kallikrein material in their cytoplasm. Furthermore cell pellets showed a true renal type of kininogenase activity corresponding to active kallikrein which ranged from 22.3 to 1.5, and total Kallikrein from 29.9 to 2.8 pg kinins/min per mg of protein.
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Affiliation(s)
- R Caviedes
- Physiology and Biophysics Department, Faculty of North Medicine, University of Chile, Santiago
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Poblete MT, Zolezzi P, Pérez MA, Figueroa C, Zapata C. [Granulocytic sarcoma]. Rev Chil Pediatr 1984; 55:188-93. [PMID: 6594728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Olavarria F, Caorsi I, Arriagada A, Mezzano S, Figueroa C. [Focal segmental glomerulosclerosis. Clinical and histopathologic study in 14 patients]. Rev Med Chil 1983; 111:268-75. [PMID: 6648108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Florenzano R, Feuerhake O, Hinrichsen M, Figueroa C. [Ambulatory treatment of alcoholic patients in a general hospital: I. Patient characteristics]. Rev Med Chil 1982; 110:61-6. [PMID: 7156550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Urzua RF, Molina OF, Figueroa C, Hinrichsen M, Jiménez K, Núñez R. [Alcoholism and depression: epidemiologic correlations (author's transl)]. Rev Med Chil 1979; 107:799-806. [PMID: 542748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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47
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Larrain F, Figueroa C, Danus O. [Therapeutic counter test in the diagnosis of celiac disease. Methods and indications]. Rev Chil Pediatr 1974; 45:417-9. [PMID: 4456452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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