1
|
Alva NV, Méndez OR, Gasca JC, Salvador I, Hernández N, Valdez M. Liver injury due to COVID-19 in critically ill adult patients. A retrospective study. Rev Gastroenterol Mex (Engl Ed) 2024; 89:57-63. [PMID: 37117133 PMCID: PMC10110936 DOI: 10.1016/j.rgmxen.2023.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 08/25/2022] [Indexed: 04/30/2023]
Abstract
INTRODUCTION AND AIM Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) emerged, causing the current pandemic of acute respiratory disease known as COVID-19. Liver injury due to COVID-19 is defined as any liver injury occurring during the course of the disease and treatment of patients with COVID-19, with or without liver disease. The incidence of elevated liver transaminases, alanine aminotransferase (ALT) and aspartate aminotransferase (AST), ranges from 2.5 to 76.3%. The aim of the present study was to describe the hepatic biochemical abnormalities, after a SARS-CoV-2-positive polymerase chain reaction (PCR) test, and the mortality rate in critically ill patients. MATERIALS AND METHODS A retrospective study was conducted that included 70 patients seen at a private hospital in Mexico City, within the time frame of February-December 2021. Median patient age was 44.5 years (range: 37-57.2) and 43 (61.4%) of the patients were men. Liver function tests were performed on the patients at hospital admission. RESULTS Gamma glutamyl transferase (GGT) levels were elevated (p = 0.032), as were those of AST (p = 0.011) and ALT (p = 0.021). The patients were stratified into age groups: 18-35, 36-50, and > 50 years of age. The 18 to 35-year-olds had the highest liver enzyme levels and transaminase levels were higher, the younger the patient. Due to the low mortality rate (one patient whose death did not coincide with a hepatic cause), the multivariate analysis showed an R2 association of 0.689, explained by AST, GGT, and C-reactive protein levels. CONCLUSIONS Despite the increase in transaminases in our study population during the course of COVID-19, there was no increase in mortality. Nevertheless, hospitalized patient progression should be continuously followed.
Collapse
Affiliation(s)
- N V Alva
- Departamento de Terapia Intensiva, Hospital Ángeles Mocel, Mexico City, Mexico.
| | - O R Méndez
- Departamento de Medicina Interna, Hospital Star Médica Centro, Mexico City, Mexico
| | - J C Gasca
- Departamento de Terapia Intensiva, Hospital Juárez de México, Mexico City, Mexico
| | - I Salvador
- Departamento de Terapia Intensiva, Hospital Ángeles Mocel, Mexico City, Mexico
| | - N Hernández
- Departamento de Inhaloterapia, Centro Médico ABC, Mexico City, Mexico
| | - M Valdez
- Departamento de Terapia Intensiva, Hospital Bicentenario, Aguascalientes, Mexico
| |
Collapse
|
2
|
Kyle Martin W, Schladweiler MC, Oshiro W, Smoot J, Fisher A, Williams W, Valdez M, Miller CN, Jackson TW, Freeborn D, Kim YH, Davies D, Ian Gilmour M, Kodavanti U, Kodavanti P, Hazari MS, Farraj AK. Wildfire-related smoke inhalation worsens cardiovascular risk in sleep disrupted rats. Front Environ Health 2023; 2:1166918. [PMID: 38116203 PMCID: PMC10726696 DOI: 10.3389/fenvh.2023.1166918] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Introduction As a lifestyle factor, poor sleep status is associated with increased cardiovascular morbidity and mortality and may be influenced by environmental stressors, including air pollution. Methods To determine whether exposure to air pollution modified cardiovascular effects of sleep disruption, we evaluated the effects of single or repeated (twice/wk for 4 wks) inhalation exposure to eucalyptus wood smoke (ES; 964 μg/m3 for 1 h), a key wildland fire air pollution source, on mild sleep loss in the form of gentle handling in rats. Blood pressure (BP) radiotelemetry and echocardiography were evaluated along with assessments of lung and systemic inflammation, cardiac and hypothalamic gene expression, and heart rate variability (HRV), a measure of cardiac autonomic tone. Results and Discussion GH alone disrupted sleep, as evidenced by active period-like locomotor activity, and increases in BP, heart rate (HR), and hypothalamic expression of the circadian gene Per2. A single bout of sleep disruption and ES, but neither alone, increased HR and BP as rats transitioned into their active period, a period aligned with a critical early morning window for stroke risk in humans. These responses were immediately preceded by reduced HRV, indicating increased cardiac sympathetic tone. In addition, only sleep disrupted rats exposed to ES had increased HR and BP during the final sleep disruption period. These rats also had increased cardiac output and cardiac expression of genes related to adrenergic function, and regulation of vasoconstriction and systemic blood pressure one day after final ES exposure. There was little evidence of lung or systemic inflammation, except for increases in serum LDL cholesterol and alanine aminotransferase. These results suggest that inhaled air pollution increases sleep perturbation-related cardiovascular risk, potentially in part by increased sympathetic activity.
Collapse
Affiliation(s)
- W. Kyle Martin
- Curriculum in Toxicology and Environmental Medicine, UNC, Chapel Hill, NC, United States
| | - M. C. Schladweiler
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - W. Oshiro
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - J. Smoot
- Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
| | - A. Fisher
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - W. Williams
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - M. Valdez
- Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
| | - C. N. Miller
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - T. W. Jackson
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - D. Freeborn
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - Y. H. Kim
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - D. Davies
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - M. Ian Gilmour
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - U. Kodavanti
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - P. Kodavanti
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - M. S. Hazari
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| | - A. K. Farraj
- Public Health & Integrated Toxicology Division, US EPA, Research Triangle Park, NC, United States
| |
Collapse
|
3
|
Coronel E, Candoni G, Pelaez S, Sanchez-Correa C, Tomadín R, Valdez M. PERCEPCIONES SOBRE LA REHABILITACIÓN DURANTE LA PANDEMIA COVID-19 DE LAS PERSONAS CON DISCAPACIDAD MOTORA. Rehabilitacion (Madr) 2022:S0048-7120(22)00015-9. [PMID: 36357221 PMCID: PMC9035362 DOI: 10.1016/j.rh.2022.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 03/07/2022] [Accepted: 03/11/2022] [Indexed: 11/30/2022]
Abstract
Antecedentes y objetivo La Organización Mundial de la Salud declaró a la infección por COrona VIrus Disease 19 (COVID-19) como pandemia y recomendó, como medida preventiva, el distanciamiento social. Esto afectó a todos los tratamientos médico-clínicos, incluidos los relacionados con el proceso de rehabilitación física. El objetivo fue describir las percepciones sobre el proceso de rehabilitación debido a las modificaciones experimentadas por las personas con discapacidad motora de un hospital de rehabilitación durante la pandemia por COVID-19. Pacientes y métodos Diseño cualitativo. La muestra elegida fue por conveniencia y el análisis de datos fue por análisis temático, el cual permite identificar, analizar y reportar temas relevantes. Las entrevistas se realizaron a pacientes atendidos en la División de Kinesiología. Criterios de inclusión: adultos > 18 años, diagnóstico de discapacidad motora, en tratamiento kinésico ≥ 1 mes de forma ambulatoria, con alta temprana de internación o internados en el momento de la realización del estudio y firma del consentimiento informado. Criterios de exclusión: alta kinésica por motivos diferentes a la COVID-19 y diagnóstico de enfermedad psiquiátrica. Resultados La muestra se compuso de 16 participantes. El 31,2% era de sexo femenino. Doce presentaron diversas alteraciones neurológicas y 4, secuelas de amputación. Se identificaron 4 temas principales: importancia de la rehabilitación, modificaciones/interrupción del tratamiento, actividades de la vida diaria y telerrehabilitación. Conclusiones Se describieron las percepciones sobre el proceso de rehabilitación y el impacto en las modificaciones experimentadas en las personas con discapacidad motora. Destacamos la importancia de la telerrehabilitación como un recurso alternativo.
Collapse
|
4
|
Candoni G, Coronel E, Sanchez-Correa C, Tomadín R, Valdez M. [Psychometric properties of observational instruments to evaluate wheelchair skills in persons with a spinal cord injury: A systematic review]. Rehabilitacion (Madr) 2020; 55:125-137. [PMID: 33272607 DOI: 10.1016/j.rh.2020.10.005] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 10/08/2020] [Accepted: 10/09/2020] [Indexed: 11/18/2022]
Abstract
A total of 60% of people with a spinal cord injury are completely dependent on a wheelchair. There is a wide variety of instruments that assess wheelchair skills, but they are not specific for this population. OBJECTIVE: To identify, assess, compare and summarize the psychometric properties of instruments that assess wheelchair skills in persons with a spinal cord injury. A systematic review was conducted and observational instruments were included that assessed wheelchair skills in persons with spinal cord injury. Eleven articles were identified that evaluated eight instruments. Most of them reported activities according to the International Classification of Functioning, Disability and Health. Reliability was the most frequently evaluated psychometric property. The Queensland Evaluation of Wheelchair Skills and the Adapted Manual Wheelchair Circuit had the best degrees of confidence in the evidence, and their application could guide the selection of pertinent therapeutic strategies. PROSPERO registration: CRD42020161430.
Collapse
Affiliation(s)
- G Candoni
- División de Kinesiología, Hospital de Rehabilitación Manuel Rocca, Buenos Aires, Argentina.
| | - E Coronel
- División de Kinesiología, Hospital de Rehabilitación Manuel Rocca, Buenos Aires, Argentina
| | - C Sanchez-Correa
- División de Kinesiología, Hospital de Rehabilitación Manuel Rocca, Buenos Aires, Argentina
| | - R Tomadín
- División de Kinesiología, Hospital de Rehabilitación Manuel Rocca, Buenos Aires, Argentina
| | - M Valdez
- División de Kinesiología, Hospital de Rehabilitación Manuel Rocca, Buenos Aires, Argentina
| |
Collapse
|
5
|
Hassan N, Cordero ML, Sierpe R, Almada M, Juárez J, Valdez M, Riveros A, Vargas E, Abou-Hassan A, Ruso JM, Kogan MJ. Peptide functionalized magneto-plasmonic nanoparticles obtained by microfluidics for inhibition of β-amyloid aggregation. J Mater Chem B 2018; 6:5091-5099. [DOI: 10.1039/c8tb00206a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Synthesis of magneto-plasmonic nanoparticles for the inhibition of β-amyloid fibril formation.
Collapse
|
6
|
Gonzalez G, Valdez M, Gutierrez R, Valdez J, McLaughlin T, Cherukury H, Chen H, Leon‐Olea M, Curras‐Collazo M. Perinatal Exposure to Brominated Flame Retardants Reduces Social Recognition Ability in Adult Male Mice. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.840.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- G Gonzalez
- Department of Cell Biology and Neuroscience University of California RiversideRiversideCAUnited States
| | - M Valdez
- Neuroscience Graduate Department University of California RiversideRiversideCAUnited States
| | - R Gutierrez
- Department of Cell Biology and Neuroscience University of California RiversideRiversideCAUnited States
| | - J Valdez
- Department of Cell Biology and Neuroscience University of California RiversideRiversideCAUnited States
| | - T McLaughlin
- Department of Cell Biology and Neuroscience University of California RiversideRiversideCAUnited States
| | - H Cherukury
- Department of Cell Biology and Neuroscience University of California RiversideRiversideCAUnited States
| | - H Chen
- Department of Cell Biology and Neuroscience University of California RiversideRiversideCAUnited States
| | - M Leon‐Olea
- Depto. de Neurmofologia Funcional Instituto Nacional de PsiquiatriaMexico CityMexico
| | - M Curras‐Collazo
- Neuroscience Graduate Department University of California RiversideRiversideCAUnited States
- Department of Cell Biology and Neuroscience University of California RiversideRiversideCAUnited States
| |
Collapse
|
7
|
Castle PE, Qiao YL, Zhao FH, Chen W, Valdez M, Zhang X, Kang LN, Bansil P, Paul P, Bai P, Peck R, Li J, Chen F, Jeronimo J. Clinical determinants of a positive visual inspection after treatment with acetic acid for cervical cancer screening. BJOG 2014; 121:739-46. [PMID: 24575872 DOI: 10.1111/1471-0528.12646] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/30/2013] [Indexed: 11/30/2022]
Affiliation(s)
- PE Castle
- Global Cancer Initiative; Chestertown MD USA
| | - Y-L Qiao
- Cancer Institute and Hospital; Chinese Academy of Medical Sciences; Peking Union Medical College; Beijing China
| | - F-H Zhao
- Cancer Institute and Hospital; Chinese Academy of Medical Sciences; Peking Union Medical College; Beijing China
| | - W Chen
- Cancer Institute and Hospital; Chinese Academy of Medical Sciences; Peking Union Medical College; Beijing China
| | | | - X Zhang
- Cancer Institute and Hospital; Chinese Academy of Medical Sciences; Peking Union Medical College; Beijing China
| | - L-N Kang
- Cancer Institute and Hospital; Chinese Academy of Medical Sciences; Peking Union Medical College; Beijing China
| | | | | | - P Bai
- Cancer Institute and Hospital; Chinese Academy of Medical Sciences; Peking Union Medical College; Beijing China
| | | | - J Li
- Cancer Institute and Hospital; Chinese Academy of Medical Sciences; Peking Union Medical College; Beijing China
| | - F Chen
- Cancer Institute and Hospital; Chinese Academy of Medical Sciences; Peking Union Medical College; Beijing China
| | | |
Collapse
|
8
|
Valdez M, Balachandran B. Longitudinal nonlinear wave propagation through soft tissue. J Mech Behav Biomed Mater 2013; 20:192-208. [DOI: 10.1016/j.jmbbm.2013.01.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2012] [Revised: 09/21/2012] [Accepted: 01/04/2013] [Indexed: 10/27/2022]
|
9
|
Major G, Beaumont M, Grathwohl D, Valdez M, Macé K. Addition of calcium to a green tea and caffeine beverage decreases its thermogenic effect. Can J Diabetes 2011. [DOI: 10.1016/s1499-2671(11)52187-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
10
|
Tissot van Patot M, Valdez M, Becky V, Cindrova-Davies T, Johns J, Zwerdling L, Jauniaux E, Burton G. Impact of Pregnancy at High Altitude on Placental Morphology in Non-native Women With and Without Preeclampsia. Placenta 2009; 30:523-8. [DOI: 10.1016/j.placenta.2009.04.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Revised: 03/31/2009] [Accepted: 04/02/2009] [Indexed: 11/29/2022]
|
11
|
Ernst A, Weiss S, Hall J, Clark R, Rihani T, Hobley K, Midkiff M, Lehrman C, Dettmer T, Ramone B, Valdez M, Coffman B, Castillo DC. Adult Intimate Partner Violence (IPV) Perpetrators are Significantly More Likely to Have Witnessed IPV as a Child (CW) than Non-Perpetrators. Acad Emerg Med 2007. [DOI: 10.1197/j.aem.2007.03.812] [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: 11/10/2022]
|
12
|
Valdez M, Van Patot MT, Becky V. 240 PREGNANCY AT ALTITUDE AND PREECLAMPSIA: THE STRUCTURE OF THE PLACENTAL VILLI AT ALTITUDE AND IN THE DISEASE STATE. J Investig Med 2005. [DOI: 10.2310/6650.2005.00005.239] [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: 11/18/2022]
|
13
|
Sorensen S, Tran H, Canales L, Valdez M, Holmes T. We are kinder to our patients than we are to each other: how can we act the same toward everyone? Biol Blood Marrow Transplant 2004. [DOI: 10.1016/j.bbmt.2003.12.225] [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: 11/27/2022]
|
14
|
Lopez-Palop R, Saura D, Pinar E, Lozano I, Pérez-Lorente F, Picó F, Valdez M. Adequate intracoronary adenosine doses to achieve maximum hyperaemia in coronary functional studies by pressure derived fractional flow reserve: a dose response study. Heart 2004; 90:95-6. [PMID: 14676256 PMCID: PMC1768040 DOI: 10.1136/heart.90.1.95] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
15
|
Valdez M, Burke TF, Hensler JG. Selective heterologous regulation of 5-HT1A receptor-stimulated 35S GTPgammaS binding in the anterior cingulate cortex as a result of 5-HT2 receptor activation. Brain Res 2002; 957:174-82. [PMID: 12443993 DOI: 10.1016/s0006-8993(02)03637-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [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: 11/30/2022]
Abstract
Previous studies have shown that administration of the 5-HT(2) receptor agonist DOI to rats results in the heterologous desensitization of 5-HT(1A) receptor-mediated behavioral and neuroendocrine responses [Neuropsychopharmacology 19 (1998) 354; J. Neurosci. 21 (2001) 7919]. We hypothesized that the basis for these changes in 5-HT(1A) receptor function may involve changes in the capacity of the 5-HT(1A) receptor to activate G proteins. We examined the effect of chronic administration of DOI on the regulation of 5-HT(1A) receptor function at the level of receptor-G protein interaction using quantitative autoradiography of [(35)S]GTPgammaS binding stimulated by the 5-HT(1A) receptor agonist (+/-)8-OH-DPAT (1 microM). Repeated administration of DOI (1 mg/kg, s.c. once daily for 8 days) resulted in a marked down-regulation in 5-HT(2A) binding sites, as labeled by the antagonist radioligand [(3)H]ketanserin, throughout the cerebral cortex. Chronic DOI treatment also resulted in a significant and selective attenuation of 5-HT(1A) receptor-stimulated [(35)S]GTPgammaS binding in the anterior cingulate cortex (vehicle-treated: 74+/-7.7% above basal; DOI-treated: 43+/-4.6% above basal). Interestingly, 5-HT(1A) receptor-stimulated [(35)S]GTPgammaS binding was not altered in the dorsal or median raphe, or in the limbic structures and other cortical regions examined. The decrease in 5-HT(1A) receptor-stimulated [(35)S]GTPgammaS binding in anterior cingulate cortex was not due to a decrease in 5-HT(1A) receptor number, indicating that the capacity of the 5-HT(1A) receptor to activate G proteins is attenuated in this cortical area following repeated DOI treatment. The heterologous regulation of 5-HT(1A) receptor function by chronic 5-HT(2) receptor activation in the anterior cingulate cortex raises interesting questions as to how the regulatory interaction between these serotonin receptor subtypes influences cognition, memory and emotion.
Collapse
Affiliation(s)
- M Valdez
- Department of Pharmacology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA
| | | | | |
Collapse
|
16
|
Valdez M, Haines R, Riviere KH, Riviere GR, Thomas DD. Isolation of oral spirochetes from dogs and cats and provisional identification using polymerase chain reaction (PCR) analysis specific for human plaque Treponema spp. J Vet Dent 2000; 17:23-6. [PMID: 11968929] [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: 02/24/2023]
Abstract
Identification of plaque spirochetes from dogs is rare and no studies to date report cultivation of canine or feline plaque spirochetes. Plaque samples obtained from canine and feline patients were cultured in broth media. Spirochetes cultured were subjected to microscopic evaluation and were cloned on a solid medium. The clones were provisionally identified using species-specific PCR for treponema isolated from human plaque. Canine spirochete clones included Treponema denticola, T. socranskii ssp., T. vincentii, T. maltophilum, T. medium, and T. pectinovorum. Feline clones included T. maltophilum and T. socranskii. Non-amplified clones may represent novel treponemes. Future studies will be aimed at comparison of the spirochetes present in dogs and cats with or without periodontal disease.
Collapse
Affiliation(s)
- M Valdez
- Department of Periodontics, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, Texas 78284-7894, USA
| | | | | | | | | |
Collapse
|
17
|
Abstract
Oral spirochetes were co-incubated with monolayers of endothelial cells seeded into multiwell plates or onto filters mounted in plastic chambers. Attachment was assessed using an enzyme-linked immunosorbent assay and scanning electron microscopy. Invasiveness was determined by monitoring media beneath filters within chambers for spirochetes using darkfield microscopy. Transmission electron microscopy was used to estimate intercellular and intracellular passage of spirochetes through monolayers. All tested treponemes attached to monolayers in a dose- and time-dependent manner, except Treponema phagedenis. A few treponemes were observed within host cell cytoplasm. Unidentified spirochetes obtained from dental plaque were also invasive. Results indicate that oral spirochetes possess virulence-associated characteristics shared with pathogenic spirochetes. Further studies should examine the possibility that invasive spirochetes could disseminate from within affected gingiva.
Collapse
Affiliation(s)
- S R Peters
- Department of Periodontics, University of Texas Health Science Center at San Antonio 78284, USA
| | | | | | | |
Collapse
|
18
|
Cooper P, Guderian R, Orellana P, Sandoval C, Olalla H, Valdez M, Calvopiña M, Guevara A, Griffin G. An outbreak of bartonellosis in Zamora Chinchipe Province in Ecuador. Trans R Soc Trop Med Hyg 1997; 91:544-6. [PMID: 9463663 DOI: 10.1016/s0035-9203(97)90019-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [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: 02/06/2023] Open
Abstract
We report an outbreak of human bartonellosis in Zamora Chinchipe Province in Ecuador, which occurred in 1995-1996. Nineteen cases were seen, of which 18 presented with classical oroya fever (fever and profound anaemia) and one with verruga peruana; 11 of the cases (58%) had positive blood films containing Bartonella bacilliformis. The houses of cases and neighbouring controls were visited; blood samples for thin films and cultures were collected from members of each house and a questionnaire was administered to investigate possible risk factors for disease transmission. In none of those sampled was B. bacilliformis bacteriologically demonstrable. All case houses were located in isolated areas at the margin of forest and the presence of dead rodents was reported only in case houses (P < 0.05). We suggest that human bartonellosis is a zoonosis with a natural rodent reservoir and that migrant humans infected in this way may become a temporary reservoir host in populated areas.
Collapse
Affiliation(s)
- P Cooper
- Department of Clinical Investigations, Hospital Vozandes, Quito, Ecuador
| | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Valdez M, Muñoz M, Vega JR, Espinoza AM. Plant regeneration of indica rice (Oryza sativa) cultivars from mature embryo-derived calli. REV BIOL TROP 1997; 44-45:13-21. [PMID: 9404510 DOI: 10.15517/rbt.v44i3.21827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Abstract
Plant regeneration from seven-week-old callus cultures derived from mature embryos of several indica rice cultivars was achieved with frequencies of morphogenic calli from 10 to 47%. Three media were tested both for callogenesis and plant regeneration. For 3 of the 7 genotypes examined, the best combination of media for plant regeneration was Murashige & Skoog basal medium: MSC (callogenesis) and MSR (regeneration). The rates of callogenesis were not related to the capacity for plant regeneration. Two genotypes CR-1113 and CR-5272 produced the highest number of regenerated green plants. The results of this study suggest that genetic differences could be directly linked to the ability to regenerate in these plant cultivars.
Collapse
Affiliation(s)
- M Valdez
- Escuela de Biología, Universidad de Costa Rica, San José, Costa Rica
| | | | | | | |
Collapse
|
20
|
|
21
|
Cooper P, Guderian R, Paredes W, Daniels R, Perera D, Espinel M, Valdez M, Griffin G. Bartonellosis in Zamora Chinchipe province in Ecuador. Trans R Soc Trop Med Hyg 1996; 90:241-3. [PMID: 8758062 DOI: 10.1016/s0035-9203(96)90229-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 02/02/2023] Open
Abstract
Human bartonellosis was investigated in the Ecuadorian province of Zamora Chinchipe; 17 cases were identified retrospectively from hospital records over the period 1984-1995, mostly from 6 communities in the provincial district of Zumba. A questionnaire concerning risk factors for disease transmission was administered in these 6 communities. Blood samples were taken from individuals with current febrile illnesses or skin lesions suggestive of bartonellosis. Samples for detection of Bartonella bacilliformis were also taken from all school-age children in communities where historical cases had been identified by questionnaire. No bacteriologically positive case was identified and no evidence of asymptomatic infection was detected. Risk factors for disease transmission, identified by the questionnaire, included the presence of sick or dying chickens and guinea-pigs. It was suggested that bartonellosis is a zoonosis with wild animals, probably rodents, as the reservoir. The widespread use of residual insecticides and the easy availability of antibiotics is likely to have modified the epidemiology of this disease over the last decade.
Collapse
Affiliation(s)
- P Cooper
- Department of Clinical Investigations, Hospital Vozandes, Quito, Ecuador
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Keeling SD, King GJ, McCoy EA, Valdez M. Serum and alveolar bone phosphatase changes reflect bone turnover during orthodontic tooth movement. Am J Orthod Dentofacial Orthop 1993; 103:320-6. [PMID: 8480697 DOI: 10.1016/0889-5406(93)70012-d] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [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: 01/31/2023]
Abstract
Acid and alkaline phosphatase changes have been demonstrated histochemically and biochemically during the early stages of an orthodontic tooth movement cycle. However, quantitative data on neither alveolar bone nor serum phosphatase changes over an entire tooth movement cycle have been reported. This study examined acid, tartrate-resistant acid (TRAP), and alkaline phosphatase changes in serum and alveolar bone during an orthodontic tooth movement cycle in 288 adult male Sprague-Dawley strain rats. The effect of differing initial force magnitudes on phosphatase changes was also examined. Data were obtained from four groups: sham control and three treatment groups (20, 40, and 60 gm activations). Each group (n = 72) was subdivided equally into six sacrifice subgroups (1,3,5,7,10, and 14 days). Treated animals received a precisely loaded orthodontic tipping force to the maxillary molars. Phosphatase measures were obtained by colorimetric assays. Analysis of variance (ANOVA) procedures were performed to examine for differences within groups across time and among groups at each time point. Data from treated animals were combined, adjusted for control values, and examined across time to permit comparisons with previously described histomorphometric changes. Analysis of variance indicated no differences occurred in the control group across time. Significant differences in serum values occurred across time within the force groups (p < 0.01), and among force and control groups at various times in both sera and bone (p < 0.05). In the pooled treatment data, a peak in serum acid phosphatase occurred at day 1 and in bone at day 3 (the later mirroring histomorphometric findings) (p < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- S D Keeling
- Department of Orthodontics, College of Dentistry, University of Florida, Gainesville
| | | | | | | |
Collapse
|
23
|
Boissot N, Valdez M, Guiderdoni E. Plant regeneration from leaf and seed-derived calli and suspension cultures of the African perennial wild rice, Oryza longistaminata. Plant Cell Rep 1990; 9:447-50. [PMID: 24227175 DOI: 10.1007/bf00232270] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/1990] [Revised: 08/02/1990] [Indexed: 05/02/2023]
Abstract
Plant regeneration from 2-month-old callus cultures derived from immature leaves of 7-day-old aseptic seedlings and mature embryos of the African wild rice Oryza longistaminata was achieved at 20% and 100% frequency, respectively. The morphogenic potential of the embryo-derived calluses dropped from 100% at the third subculture to 12.5 % at the 12th subculture. Five-month-old morphogenic calluses were used to establish a fast-growing suspension culture which, when plated onto semisolid medium, still retained its ability to regenerate plantlets 9 months after initiation. Histological analyses demonstrated that late plant regeneration from established callus and suspension cultures occured through organogenesis, although some embryogenesis events may have taken place during initiation of these cultures.
Collapse
Affiliation(s)
- N Boissot
- Laboratoire d'amélioration des plantes, U.A. 115, Bât. 360, Université d'Orsay, F-91405, Orsay Cedex 05, France
| | | | | |
Collapse
|
24
|
|