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Valdés D, Molina F, Barrientos C, Valenzuela P, Basaigoitia A, Burrone M, Reginatto G, Leniz I, Solis-Soto M. Psychosocial effects of COVID-19 pandemic in Bolivia. Preliminary results. Eur Psychiatry 2021. [PMCID: PMC9471638 DOI: 10.1192/j.eurpsy.2021.841] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Introduction The global health crisis due to Coronavirus Disease 2019 (COVID-19) and related containment measures have led to changes in daily life and, therefore, social and psychological impacts on the population. Objectives To explore the psychological and social impact of COVID-19 in the general population of Bolivia. Methods Cross-sectional study was implemented using an anonymous and self-administered online questionnaire. Adult people were invited to participate through social networks between May to June 2020. The questionnaire included sociodemographic information, coping strategies, changes in income and working conditions and psychological distress (K10 Scale). Results A total of 878 adults living in Bolivia answered the questionnaire. Most people considered COVID-19 as a quite/very serious health problem that affects the entire population, without distinction. 65% reported to accomplish lock down measure, however, one of the main reasons for non-compliance is the need to go out to work. Half of participants (50%) reduced worked hours and 18% modified their employment contract. However, 70% reduced household income. A considerable percentage (62%) reported psychological distress (46% with moderate or severe). It was higher in women, young people and among those with lower household income. In addition, social networks and watching series and movies were the main coping strategies reported. Conclusions The COVID-19 pandemic has a considerable impact on psychological and social level. The negative impact was greater in some population groups such as women, young people, and those with a lower socioeconomic level, which may further increase inequities.
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Couso A, Zapico Á, Arribas I, Arnanz F, Justo Gil S, Valenzuela P, Fuentes P. Abordaje laparoscópico mediante puerto único versus técnica convencional en el tratamiento quirúrgico del cáncer de endometrio. Clínica e Investigación en Ginecología y Obstetricia 2021. [DOI: 10.1016/j.gine.2020.04.009] [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: 11/24/2022]
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Valenzuela P, Barrientos C, Molina F, Valdés D, Leniz I, Reginatto G, Basaigoitia A, Solis-Soto M, Burrone M. Psychological well-being and employment status during the COVID-19 pandemic. Eur Psychiatry 2021. [PMCID: PMC9528299 DOI: 10.1192/j.eurpsy.2021.685] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
IntroductionSeveral restrictive measures have been implemented to reduced COVID- 19 impact with unknown consequences on people daily life.ObjectivesThe primary objective is to asses the psychosocial impact and employment status changes since lockdown COVID-19 measures in Chile.MethodsCross-sectional study was implemented using an anonymous and self-administered online questionnaire. Adult people were invited to participate through social networks between May to June 2020. The questionnaire included sociodemographic information, coping strategies, changes in income and working conditions and psychological distress (K10 Scale).Results
3102 participants over 18 years answered the questionnaire. 69.9% reported psychological distress mainly women (82.2%), members of the public health system (59%), dependent workers (39.8%), people who suffered income reduction (36.8%)., and those who changed their employment status (26.4%). Participants who presented income reduction were 1.83 times more likely to present psychological distress than those without changes (p <0.001)ConclusionsPandemic crisis had impacted population health, especially in some specifics groups that could be targeted for future interventions.
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Bolivar S, Espitia-Corredor JA, Olivares-Silva F, Valenzuela P, Humeres C, Anfossi R, Castro E, Vivar R, Salas-Hernández A, Pardo-Jiménez V, Díaz-Araya G. In cardiac fibroblasts, interferon-beta attenuates differentiation, collagen synthesis, and TGF-β1-induced collagen gel contraction. Cytokine 2020; 138:155359. [PMID: 33160814 DOI: 10.1016/j.cyto.2020.155359] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 10/27/2020] [Accepted: 10/29/2020] [Indexed: 12/13/2022]
Abstract
Cardiac fibroblasts (CF) play a key role in the homeostasis of the extracellular matrix in cardiac tissue and are newly recognized as inflammatory supporter cells. Besides, CF-to-Cardiac myofibroblast differentiation is commanded by TGF-b, through SMAD signaling pathways, and these last cells are strongly implicated in cardiac fibrosis. In the heart IFN-β is produced by CF; however, the role of IFN-β, STAT proteins, and STAT-homo or heterodimers in the regulation of CF function with or without a fibrotic environment is unknown. CF were isolated from hearts of adult rats, and by western blot analysis we studied STAT1, STAT2, and STAT3 phosphorylation and through specific siRNA against these proteins we analyzed their role in CF functions such as differentiation (α-SMA expression); and pro-collagen type-I synthesis and secretion expression levels; collagen gels contraction and CF migration. In cultured adult rats CF, IFN-β increases phosphorylation of STAT1, STAT2, and STAT3. Both STAT1 and STAT2 were involved in decreasing α-SMA and CF migration induced by TGF-β1. Also, IFN-β through STAT1 regulated pro-collagen type-I protein expression levels, and collagen gels contraction induced by TGF-β1. STAT3 was not involved in any effects of IFN-β studied. In conclusion, IFN-β through STAT1 and STAT2 shows antifibrotic effects on CF TGF-β1-treated, whereas STAT3 did not participate in such effect.
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Affiliation(s)
- S Bolivar
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile; Faculty of Chemistry and Pharmacy, Universidad del Atlántico, Barranquilla, Colombia
| | - J A Espitia-Corredor
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - F Olivares-Silva
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - P Valenzuela
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - C Humeres
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - R Anfossi
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - E Castro
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - R Vivar
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - A Salas-Hernández
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - V Pardo-Jiménez
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - G Díaz-Araya
- Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile; Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences and Faculty of Medicine, University of Chile, Santiago, Chile.
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Arteaga E, Martinez A, Jaramilo J, Villaseca P, Cuello M, Valenzuela P, Gejman R, Blumel JE. Postmenopausal androgen-secreting ovarian tumors: challenging differential diagnosis in two cases. Climacteric 2019; 22:324-328. [DOI: 10.1080/13697137.2018.1549214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- E. Arteaga
- Department of Endocrinology, Division of Medicine, and CETREN, Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - A. Martinez
- Department of Endocrinology, Division of Medicine, and CETREN, Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - J. Jaramilo
- Department of Endocrinology, Division of Medicine, and CETREN, Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - P. Villaseca
- Department of Endocrinology, Division of Medicine, and CETREN, Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - M. Cuello
- Department of Gynecology, Division of Obstetrics and Gynecology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - P. Valenzuela
- Department of Gynecology, Division of Obstetrics and Gynecology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - R. Gejman
- Department of Pathology, Division of Imaging, Laboratories and Pathology, Faculty of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - J. E. Blumel
- Department of Internal Medicine (South), Faculty of Medicine, Universidad de Chile, Santiago, Chile
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Zapico Á, Couso A, Valenzuela P, Fuentes P. Cirugía oncológica ginecológica mediante puerto único y endoscopia operatoria por orificios naturales empleando equipamiento convencional. Clínica e Investigación en Ginecología y Obstetricia 2018. [DOI: 10.1016/j.gine.2017.04.002] [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: 11/17/2022]
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Martínez-Parrondo N, Heron S, Guzmán M, Valenzuela P, Zapico A. Hiperplasia endometrial atípica en biopsia preoperatoria y resultado de la pieza de histerectomía. Clínica e Investigación en Ginecología y Obstetricia 2012. [DOI: 10.1016/j.gine.2011.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Huez-López MA, Preciado FA, López-Elías J, Álvarez A, Jiménez J, Valenzuela P. PRODUCTIVIDAD DE AJO (Allium sativum L.) BAJO RIEGO POR GOTEO EN LA COSTA DE HERMOSILLO, MÉXICO. BT 2009. [DOI: 10.18633/bt.v11i2.58] [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: 11/08/2022]
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Valenzuela P, Saiz Puente MS, Valero JL, Azorín R, Ortega R, Guijarro R. Continuous versus interrupted sutures for repair of episiotomy or second-degree perineal tears: a randomised controlled trial. BJOG 2009; 116:436-41. [PMID: 19187377 DOI: 10.1111/j.1471-0528.2008.02056.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To evaluate the repair techniques of continuous and interrupted methods for episiotomy or perineal tears. DESIGN A randomised controlled trial. SETTING The Hospital Universitario Principe de Asturias, a state hospital belonging to the community of Madrid. SAMPLE Four hundred forty-five women who had undergone vaginal deliveries with episiotomies or second-grade tearing of the perineum between September 2005 and July 2007. METHODS One group was repaired with continuous, nonlocking sutures involving the vagina, perineum, and subcutaneous tissues. The other group had continuous, locking sutures of the vagina, interrupted sutures in the perineal muscles, and interrupted transcutaneous sutures. The threads used for stitching were identical in both groups. MAIN OUTCOME MEASURES The participants were questioned regarding the sensation of pain and the use of painkillers on the second and the tenth days, and 3 months postpartum. RESULTS When comparing the group with continuous suture to the group with interrupted sutures, the differences included less repair time (1 minute; P= 0.017) and less suture material used (relative risk [RR], 3.2, 95% CI: 2.6-4.0). The comparison of pain on the second and tenth days, and 3 months postpartum were not statistically different between the two techniques (RR, 1.08, 95% CI: 0.74-1.57; RR, 0.96, 95% CI: 0.59-1.55; and RR, 0.68, 95% CI: 0.19-2.46, respectively). CONCLUSIONS Although we did not demonstrate that one technique was better than the other in the incidence of pain in the short or long term, we showed that episiotomy and perineal tear repairs with continuous suturing were quicker and used less suture material without an increase in complication than interrupted suturing.
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Affiliation(s)
- P Valenzuela
- Department of Medical Specialties, Alcalá de Henares University, Madrid, Spain.
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Valenzuela P, Guijarro R, Ortega R, Arribas I. Effects of time on pH and gas values in the blood contained in the umbilical cord of a subgroup of newborns with acidosis. Arch Dis Child Fetal Neonatal Ed 2008; 93:F395. [PMID: 18723783 DOI: 10.1136/adc.2007.133173] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Valenzuela P, Ramos P, Redondo S, Cabrera Y, Alvarez I, Ruiz A. Endometrioid adenocarcinoma of the ovary and endometriosis. Eur J Obstet Gynecol Reprod Biol 2007; 134:83-6. [PMID: 16844279 DOI: 10.1016/j.ejogrb.2006.06.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2005] [Revised: 05/08/2006] [Accepted: 06/13/2006] [Indexed: 11/25/2022]
Abstract
OBJECTIVE We present a retrospective analysis of 22 cases of endometrioid ovarian carcinoma, reviewed to identify endometriosis and its malignant transformation. STUDY DESIGN Twenty-two patients with endometrioid ovarian cancer were included in the review. Their clinical and histological data were retrospectively reviewed. The origin of the tumours was considered endometriosis-related when the presence of malignant changes in endometriosis glands leading to endometrioid carcinoma were found. RESULTS Endometriosis was detected in three cases (3/22=14%). One of them presented a clearly benign to malignant transformation area. In another patient, the transition zone was abrupt and present in both ovaries. In the third, a pre-menopausal woman, ovarian endometriosis with only focal endometrioid carcinoma was observed. The three of them had a clear-cell carcinoma component. The presence of a clear-cell component was significantly greater in patients with endometriosis than in patients without endometriosis Each patient had a different clinical presentation: increase in abdominal perimeter, post-menopausal vaginal haemorrhage and hypermenorrhea. Preoperative CA 125 levels were avalaible in 15 of the patients (15/22=68%). Endometriosis was found in two of these 15 patients, both with the highest CA 125 measured levels, exceeding 1700 U/ml. In the remaining of the patients, CA 125 value did not exceed 35 U/ml. CONCLUSION Although this association is not very frequent, patients with ovarian endometriosis and a high CA 125 serum level should be managed with special care, regardless of their pre-menopausal or post-menopausal status.
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Affiliation(s)
- P Valenzuela
- Obstetrics and Gynaecology Department, Principe de Asturias Hospital, Alcalá de Henares University, Alcalá de Henares, Madrid, Spain.
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Valenzuela P, Ramos P, Solano J. Transición entre endometriosis y carcinoma endometrioide de ovario. Clínica e Investigación en Ginecología y Obstetricia 2007. [DOI: 10.1016/s0210-573x(07)74467-2] [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] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tagle LH, Terraza CA, Leiva A, Valenzuela P. Poly(amides) and poly(imides) containing silicon and germanium in the main chain: Synthesis, characterization and thermal studies. J Appl Polym Sci 2006. [DOI: 10.1002/app.24454] [Citation(s) in RCA: 21] [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: 11/06/2022]
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Valenzuela P. Removal of a fetal scalp electrode lodged in the vagina of a patient for 23 years. J OBSTET GYNAECOL 2006; 26:704-5. [PMID: 17071453 DOI: 10.1080/01443610600940315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- P Valenzuela
- Department of Medical Specialties, Príncipe de Asturias Hospital, University of Alcalá de Henares, Madrid, Spain.
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Abstract
BACKGROUND The pH and gas analysis of umbilical cord blood is an accepted practice in most maternity hospitals. The data that is obtained after a latency period in processing the cord blood samples is evaluated to determine whether it is useful for the clinic. METHODS The umbilical cords from 50 term infants were clamped immediately after delivery. Samples of artery and vein blood were drawn 5, 60, and 120 min postpartum and pH, pO2, and pCO2 levels were measured. RESULTS No significant differences were found after 60 min in the average values for pH in the arterial and venous paired samples, though the arterial and venous pCO2 values declined significantly. The arterial pO2 values increased significantly. After 120 min, no significant differences in the average values for the venous pH and pO2 paired samples were found. The arterial pH values increased significantly, however, and the arterial and venous pCO2 values declined significantly. The arterial pO2 values increased significantly. CONCLUSIONS Though statistically significant differences occurred over time, these changes were so modest clinically that the data could still be used even when an immediate analysis of the umbilical cord was not possible.
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Affiliation(s)
- P Valenzuela
- Department of Medical Specialties, Alcalá de Henares University, Alcalá de Henares, Madrid, Spain.
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Valenzuela P, Domínguez P. Ovarian hilus cell tumours. J OBSTET GYNAECOL 2004; 18:91. [PMID: 15512020 DOI: 10.1080/01443619868451] [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: 10/17/2022]
Affiliation(s)
- P Valenzuela
- Department of Gynaecology, Hospital Universitario Príncipe de Asturias, Madrid, Spain
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Bajo AM, Prieto JC, Valenzuela P, Martínez P, Menor C, Marina A, Vázquez J, Guijarro LG. Association of adenylate cyclase with an actin-like protein in the human myometrium. Gynecol Endocrinol 2004; 18:89-96. [PMID: 15195500 DOI: 10.1080/09513590310001652964] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Regulation of muscle contraction by second messengers such as cAMP and regulation of the adenylate cyclase enzyme by the cytoskeleton have been previously described. However, the physical association of both effector and structural elements is still unknown. In this context, we have co-purified a human myometrial adenylate cyclase with an actin-like protein in a two-step purification protocol. The adenylate cyclase catalytic unit was solubilized with Lubrol-PX, submitted to anionic exchange chromatography and purified about 7-fold. The eluate was applied to a forskolin-agarose column obtaining an adenylate cyclase extract enriched 257-fold (enzymatic activity of 1390 pmol/30 min per mg protein) that co-eluted with a 74.6-kDa protein that possessed the 18-27 amino-acid fragment from the N-terminal region of human actin. Under non-reducing conditions, the apparent molecular weight of this protein decreased to 54 kDa, which has been previously described for arthrin. These results provide the first demonstration of the physical association of human myometrial adenylate cyclase with a cytoskeleton-related protein, supporting the hypothesis that adenylate cyclase is regulated by mechanical stimuli.
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Affiliation(s)
- A M Bajo
- Department of Biochemistry and Molecular Biology, University of Alcalá, Alcalá de Henares, Spain
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Valenzuela P, Mateos S, Tello E, López-Bueno MJ, Garrido N, Gaspar MJ. The contribution of the CEA marker to CA 15.3 in the follow-up of breast cancer. EUR J GYNAECOL ONCOL 2003; 24:60-2. [PMID: 12691319] [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: 03/01/2023]
Abstract
PURPOSE OF INVESTIGATION The clinical use of tumor markers during breast cancer follow-up is still surrounded by controversy. The objective of this study consisted of determining the contribution of the CEA marker to CA 15.3 in the follow-up of breast cancer patients as applied to clinical practice. METHODS Three hundred and eighteen cases of women with breast cancer were analyzed retrospectively as far as the sensitivity, the specificity and the positive and negative predictable values of the CA 15.3 and CEA markers. RESULTS Of the 318 patients, 59 suffered a relapse during the study. After evaluation of both markers the sensitivity was 56.8% (CA 15.3: 47.4%), the specificity 85.3% (CA 15.3: 88.4%), the positive predictable value was 46.4% (CA 15.3: 48.2%) and the negative predictable value was 89.41% (CA 15.3: 88%). CONCLUSIONS The low sensitivity of studied tumor markers proved of limited use on a clinical scale.
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Affiliation(s)
- P Valenzuela
- Department of Obstetrics and Gynecology, Príncipe de Asturias" Hospital, Madrid, Spain
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Affiliation(s)
- P Ramos
- Department of Pathology, Principe de Asturias University Hospital, Madrid, Spain.
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Tagle L, Diaz F, Vega J, Valenzuela P. Synthesis and characterization of poly(esters) derived from diacids and diphenols containing silicon and germanium. Eur Polym J 2003. [DOI: 10.1016/s0014-3057(02)00226-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [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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Tagle LH, Diaz FR, Valenzuela P, Opazo A. Thermal studies of poly(carbonates) and poly(thiocarbonates) containing silicon or germanium in the main chain. INT J POLYM MATER PO 2003. [DOI: 10.1080/00914030304923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Peiró E, Valenzuela P, Medina L, Cámara M, Cabrera Y, Redondo S. Diagnóstico de la amenaza de parto prematuro. Clínica e Investigación en Ginecología y Obstetricia 2003. [DOI: 10.1016/s0210-573x(03)77285-2] [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] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Araya P, Rosemblatt M, Valenzuela P, Murialdo H. The bacteriophage lambda DNA packaging enzyme: identification of four structural domains of the gpNu1 subunit using limited proteolysis. Biol Res 2002; 34:207-16. [PMID: 11715858 DOI: 10.4067/s0716-97602001000300008] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Lambda DNA terminase, the enzyme that cleaves virion-length chromosomes from multigenomic concatemers and packages them into the bacteriophage head, is composed of two subunits, gpNu1 and gpA. Direct determination of the structure of gpNu1, the smaller subunit, has not been possible because of its insolubility in aqueous solutions. Therefore, to identify smaller and potentially water-soluble domains of gpNu1, we analyzed the nature of the products obtained by limited digestion of the protein with several proteases. The gpNu1 subunit was obtained from E. coli cells transfected with the plasmid pH6-Nu1 that overproduces the protein. Incubation of gpNu1 solubized in 2.5 M guanidinium chloride with chymotrypsin resulted in the formation of at least eight discrete protein bands, while treatment with endoproteinase glu-C and bromelain yielded three and one major bands, respectively. The peptides generated by digestion with the various proteases were separated by two-dimensional gel electrophoresis and transferred to Immobilon membranes. Amino acid sequencing of the peptides allowed for the precise assignment of their N-terminal amino acid, while their estimated molecular weights permitted the identification of their C-terminal ends. The results reveal that in the presence of 2.5 M guanidinium chloride, gpNu1 is partially folded in at least four distinct structural domains that correspond to functional domains as determined by previously reported genetic experiments. This information is key to design new plasmids to overproduce these domains for further structural analysis.
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Affiliation(s)
- P Araya
- Fundación Ciencia para la Vida. Av. Marathon 1943, Santiago, Chile
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Abstract
BACKGROUND In this presentation we have compared the results from cytologic samples obtained with the cervical brush and Ayre's wooden spatula, against samples obtained with Acellon Combi. METHODS One thousand cervical smears were collected. This was a cross-sectional study, where it was decided randomly to use cervical brush for sampling of the endocervix and Ayre's wooden spatula for exocervix or Acellon Combi for both. RESULTS The combination of the cervical brush and the wooden spatula yielded an acceptable quantity of columnar cells in 71.6% of the cases, during both endocervical and exocervical sampling, while the Acellon Combi yielded an acceptable quantity in 61.7% of the cases (p<0.01). The combination of brush/spatula yielded an acceptable quantity of squamous cells from samples of endocervix and exocervix in 87.5% cases, while with the Acellon device amounted to 77.4% (p<0.001). Highly significant differences in the state of cellular preservation of samples from endocervix obtained with cervical brush technique were found upon comparison to Acellon group. CONCLUSIONS Henceforth, we believe that the use of the cervical brush and the Ayre wooden spatula increases the quantity and preservation of the cells retrieved during cervical smears compared to Acellon Combi.
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Affiliation(s)
- P Valenzuela
- Department of Obstetrics and Gynecology, Hospital Universitario Principe de Asturias, Madrid, Spain
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Arrieta FM, Muguerza J, García Sancho L, Ayuso M, Rustarazu M, Valenzuela P. Rupture of splenic artery aneurysm during pregnancy and posterior evolution of gestation. Zentralbl Gynakol 2001; 122:579-80. [PMID: 11127773 DOI: 10.1055/s-2000-10715] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
We present a case of splenic artery aneurysm rupture in a 26 weeks pregnant patient. Facing to the maternal collapse and after the ultrasonographical diagnosis of massive hemoperitoneum, the rapid intervention proved to be crucial in controlling the hemorrhage and allowed for the continuation of gestation and successful delivery.
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Affiliation(s)
- F M Arrieta
- Depts. of Obstetrics and Gynaecology, General Surgery and Anaestesia, Hospital Príncipe de Asturias, University of Alcalá de Henares, Madrid/Spain.
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Bajo A, Carrero I, Hrïstov RL, Valenzuela P, Martínez P, Cortés J, Prieto JC, Guijarro LG. Impairment of adenylate cyclase activity and G-proteins in human uterine leiomyoma. Tissue Cell 2000; 32:399-404. [PMID: 11201279 DOI: 10.1054/tice.2000.0128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The mechanisms responsible for the growth of uterine leiomyoma (a frequent cause of infertility in women) are largely unknown. Some data supports that cAMP plays a role in the growth of uterine cells but there are no reports on the status of the cAMP producing system in this human benign neoplasia. In this study, biopsies from leiomyoma and the adjacent myometrium were taken from menstruating women subjected to total hysterectomy for leiomyoma. Adenylate cyclase activity was determined by a protein-binding method, and the expression of alpha(s), alphai1/2, alphai3 and alphai0) G-protein subunits was analysed by immunoblot. The leiomyoma samples exhibited a decreased expression of as and ai1/2 with respect to the adjacent myometrial tissue. No differences were observed in alphai3 and alphaio protein expression. The basal adenylate cyclase activity as well as the efficacy (as assessed by the maximal stimulation levels) of either forskolin or, to a lesser extent, Gpp[NH]p on stimulation the enzyme activity was significantly lower in leiomyoma than in myometrium, whereas the potency (as assessed by the ED50 values) of these two agents did not vary. Present data indicate that the human leiomyoma is associated with low levels of cAMP. It is conceivable that the loss of sensitivity of adenylate cyclase to endogenous regulatory molecules could be related to the pathogenesis of human leiomyomas given that cAMP inhibits the MAP-kinase cascade in uterine tissues.
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Affiliation(s)
- A Bajo
- Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá, Alcalá de Henares, Spain
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28
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Abstract
We show the existence of functional vasoactive intestinal peptide (VIP) receptors in normal human female genital tract (endometrium, myometrium, ovary and Fallopian tube) as well as in leiomyoma (a frequent uterine pathology). The correlation between VIP binding and stimulation of adenylyl cyclase activity for all studied tissues was linear (r = 0.86) suggesting the expression of VIP receptors throughout the human female genital tract. Immunodetection of VIP receptor subtypes gave different molecular weights for VPAC(1) (47 kDa primarily) and VPAC(2) (65 kDa), which may be due to different glycosylation extents. In conclusion, this study demonstrates the expression of both subtypes of VIP receptors and their functionality in human female genital tract, suggesting that this neuropeptide could play an important physiological and pathophysiological role at this level.
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Affiliation(s)
- A M Bajo
- Unidad de Neuroendocrinología Molecular, Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá, E-28871, Alcalá de Henares, Spain
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29
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Tagle LH, Vega JC, Diaz FR, Radic D, Gargallo L, Valenzuela P. POLYMERIZATION BY PHASE TRANSFER CATALYSIS. 25. SYNTHESIS OF POLYCARBONATES AND POLYTHIOCARBONATES DERIVED FROM DIPHENOLS CONTAINING GERMANIUM AND SILICON IN THE MAIN CHAIN†. Journal of Macromolecular Science, Part A 2000. [DOI: 10.1081/ma-100101136] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Nazer J, Hubner ME, Valenzuela P, Cifuentes L. [Anorectal congenital malformations and their preferential associations. Experience of the Clinical Hospital of the University of Chile. Period 1979-1999]. Rev Med Chil 2000; 128:519-25. [PMID: 11008356] [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: 02/17/2023]
Abstract
BACKGROUND Anorectal atresia is a relatively frequent malformation in the newborn. According to the Latin American Collaborative Study for Congenital Malformations (ECLAMC), its frequency is 4.1 per 10,000 born alive. AIM To determine the frequency of anorectal malformations at birth, and compare the figures with those of other maternity hospitals in Chile participating in ECLAMC, with the figures of the whole ECLAMC and with figures from other worldwide monitoring systems. PATIENTS AND METHODS All births occurred in the University of Chile Clinical Hospital between January 1979 and August 1999, were reviewed. RESULTS During the study period, 70,242 children were born, 4,486 had a malformation and 54 had an anorectal malformation (7.7 per 10,000 born alive). Fifty nine percent had other associated malformations (of the urinary tract in 42.5%, skeletal in 26% and cardiovascular in 18.5%). Five stillborn babies had other severe malformations. Twenty one children had a fistula. Forty three % were male, 39% female and 18% had ambiguous sex. When compared with normal controls, malformed newborns had a lower birth weight, lower gestational age and a higher mean maternal age, a higher frequency of metrorrhagia during the first trimester of pregnancy, a higher number of siblings with malformations and a higher degree of consanguinity among parents. CONCLUSIONS The participation of recessive genes in the etiology of anorectal malformations is suggested.
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Affiliation(s)
- J Nazer
- Unidad de Neonatología, Hospital Clínico Universidad de Chile, Santiago, Chile
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31
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Baumeister MA, Medina-Selby A, Coit D, Nguyen S, George-Nascimento C, Gyenes A, Valenzuela P, Kuo G, Chien DY. Hepatitis B virus e antigen specific epitopes and limitations of commercial anti-HBe immunoassays. J Med Virol 2000; 60:256-63. [PMID: 10630956] [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: 02/15/2023]
Abstract
Current commercial hepatitis B virus (HBV) anti-HBe immunoassays are designed so that anti-HBe is detectable only in the absence of excess HBeAg. Recently, with the use of direct anti-HBe assays, anti-HBe was detected in individuals who had been seropositive for several years for HBeAg [Maruyama et al. (1993) J. Clin. Invest. 91:2586-2595]. Although anti-HBe seroconversion does not necessarily indicate subsequent HBeAg clearance, the ability to detect earlier anti-HBe seroconversion could have clinical significance for monitoring patients undergoing HBV immunotherapy (e.g., alpha interferon therapy). Because the HBeAg and the HBcAg share 149 amino acids, an anti-HBe assay must distinguish anti-HBe from anti-HBc antibodies. Although the HBV HBeAg and HBcAg display distinct immunogenic determinants, much remains unknown regarding the complete epitope spectrum specific to each antigen. The goal of this study was 3-fold. The first objective was to identify HBeAg specific linear epitopes. The second objective was to design an anti-HBe immunoassay capable of detecting anti-HBe specific antibody in the presence of excess HBeAg. The third objective was to characterize early anti-HBe seroconversion antibodies. The major linear epitope residing in the HBeAg amino acid sequence was mapped and 2 novel minor epitopes (delta, gamma) which appear to be HBeAg specific have been identified. An anti-HBe immunoassay capable of detecting anti-HBe specific antibody in the presence of excess HBeAg was designed. Finally, it was found that early anti-HBe seroconversion antibodies appear to be conformational, whereas later seroconversion, more typically associated with the clearance of HBeAg, is characterized by the presence of antibodies to the linear HBeAg epitopes.
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32
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Trucco M, Valenzuela P, Trucco D. [Occupational stress in health care personnel]. Rev Med Chil 1999; 127:1453-61. [PMID: 10835752] [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: 02/16/2023]
Abstract
BACKGROUND Occupational stress results from the interaction of multiple risk factors, such as the physical environment, biological function disturbances, work content and organization and diverse psychosocial components. AIM To study the frequency of symptoms and the main sources of job stress, perceived by professional and non professional health care workers and to compare gender differences. SUBJECTS AND METHODS A group of specially designed, self-administered, questionnaires adapted by the main author and independently validated, were applied. The results of two symptoms, one work satisfaction, and one job stress scales are reported. RESULTS One hundred sixteen women and 89 men were studied, 143 are professionals and 62 non professionals (clerical and nurse auxiliaries). Forty percent had symptoms of job stress and 82 subjects were defined as "probable cases", according to the ratings on the symptom scales. There were significant differences in the frequency of symptoms between professionals and non professionals (34.3 and 69.2% respectively). The main differences in symptoms, sources of job stress and dissatisfaction were more closely associated to the occupational level than to gender. CONCLUSIONS A high frequency of job stress symptoms was observed in this sample of health care workers and the risk of occupational stress varies more with the occupational level than with gender.
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Affiliation(s)
- M Trucco
- Hospital del Trabajador, Facultad de Matemáticas, Pontificia Universidad Católica de Chile
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33
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Opazo P, Müller I, Rollán A, Valenzuela P, Yudelevich A, García-de la Guarda R, Urra S, Venegas A. Serological response to Helicobacter pylori recombinant antigens in Chilean infected patients with duodenal ulcer, non-ulcer dyspepsia and gastric cancer. APMIS 1999; 107:1069-78. [PMID: 10660136] [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: 02/15/2023]
Abstract
We have previously cloned 10 Helicobacter pylori antigen genes from a Chilean strain including: cytotoxin VacA, a truncated region of CagA (called A17), a species-specific protein (Ag26), urease subunits (UreA, UreB), a flagellin, (FlaB), heat shock proteins (HspA and HspB), an adhesin (HpaA) and a lipoprotein (Lpp20). Immunogenicity of these antigens was tested by immunoblot with sera of Chilean infected patients, revealing that HpaA, A17, HspB and VacA were more frequently recognized (86%, 82%, 68% and 68%, respectively). According to the clinical condition, it was determined that Lpp20 was preferentially recognized by sera from non-ulcer dyspepsia patients (80%), A17 and VacA by patients with duodenal ulcer (92% and 83% respectively), and HspB by patients with duodenal ulcer (83%) and gastric cancer (90%). An ELISA was developed with a purified mixture of A17 and VacA antigens to test the different groups of patients. It was found that sera from duodenal ulcer patients showed higher values than those from non-ulcer dyspepsia patients, but this difference was not significant (p<0.2). Moreover, sera from gastric cancer patients showed values lower than those from non-ulcer dyspepsia patients (p<0.019). These results indicate that, in the Chilean population, antibodies raised against VacA and A 7 are not markers either for duodenal ulcer or for gastric cancer.
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Affiliation(s)
- P Opazo
- Unidad de Biología Molecular, BIOS Chile IGSA, Santiago
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34
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Valenzuela P, Domínguez P. Bilateral massive edema of the ovary. Zentralbl Gynakol 1999; 121:258-9. [PMID: 10408081] [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] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
We present a case of synchronic bilateral ovary mass edema. In spite of the patient's age and the difficulties of the intraoperative study it reveals a high likelihood of malignancy in the preoperative stage.
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Affiliation(s)
- P Valenzuela
- Dept. of Gynaecology, Hospital Universitario Príncipe de Asturias, Madrid, Spain
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35
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Chien DY, Arcangel P, Medina-Selby A, Coit D, Baumeister M, Nguyen S, George-Nascimento C, Gyenes A, Kuo G, Valenzuela P. Use of a novel hepatitis C virus (HCV) major-epitope chimeric polypeptide for diagnosis of HCV infection. J Clin Microbiol 1999; 37:1393-7. [PMID: 10203493 PMCID: PMC84783 DOI: 10.1128/jcm.37.5.1393-1397.1999] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [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: 11/20/2022] Open
Abstract
The genome of hepatitis C virus (HCV) consists of seven functional regions: the core, E1, E2/NS1, NS2, NS3, NS4, and NS5 regions. The U. S. Food and Drug Administration-licensed 2.0G immunoassay for the detection of anti-HCV uses proteins from the core, NS3, and NS4 regions (McHutchinson et al., Hepatology 15:19-25, 1992). The 3.0G enzyme-linked immunosorbent assay includes the protein from the NS5 region (Uyttendaele et al., Vox Sang. 66:122-129, 1994). The necessity of detecting antibodies to viral envelope proteins (E1 and E2) and to different genotype samples has been demonstrated previously (Chien et al., Lancet 342:933, 1993; Lok et al., Hepatology 18:497-502, 1993). In this study we have attempted to improve the sensitivity of the anti-HCV assay by developing a single multiple-epitope fusion antigen (MEFA; MEFA-6) which incorporates all of the major immunodominant epitopes from the seven functional regions of the HCV genome. A nucleic acid sequence consisting of proteins from the viral core, E1, E2, NS3, NS4, and NS5 regions and different subtype-specific regions of the NS4 region was constructed, cloned, and expressed in yeast. The epitopes present on this antigen can be detected by epitope-specific monoclonal and polyclonal antibodies. In a competition assay, the MEFA-6 protein competed with 83 to 96% of genotype-specific antibodies from HCV genotype-specific peptides. This recombinant antigen was subsequently used to design an anti-HCV chemiluminescent immunoassay. We designed our assay using a monoclonal anti-human immunoglobulin G antibody bound to the solid phase. Because MEFA-6 is fused with human superoxide dismutase (h-SOD), we used an anti-human superoxide dismutase, dimethyl acridinium ester-labeled monoclonal antibody for detection. Our results indicate that MEFA-6 exposes all of the major immunogenic epitopes. Its excellent sensitivity and specificity for the detection of clinical seroconversion are demonstrated by this assay.
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Affiliation(s)
- D Y Chien
- Chiron Corporation, Emeryville, California 94507, USA.
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36
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Baxter GT, Radeke MJ, Kuo RC, Makrides V, Hinkle B, Hoang R, Medina-Selby A, Coit D, Valenzuela P, Feinstein SC. Signal transduction mediated by the truncated trkB receptor isoforms, trkB.T1 and trkB.T2. J Neurosci 1997; 17:2683-90. [PMID: 9092589 PMCID: PMC6573096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/1996] [Revised: 01/23/1997] [Accepted: 01/31/1997] [Indexed: 02/04/2023] Open
Abstract
The trkB family of transmembrane proteins serves as receptors for BDNF and NT-4/5. The family is composed of a tyrosine kinase-containing isoform as well as several alternatively spliced "truncated receptors" with identical extracellular ligand-binding domains but very small intracellular domains. The two best-characterized truncated trkB receptors, designated as trkB.T1 and trkB.T2, contain intracellular domains of only 23 and 21 amino acids, respectively. Although it is known that the tyrosine kinase isoform (trkB.FL) is capable of initiating BDNF and NT-4/5-induced signal transduction, the functional role or roles of the truncated receptors remain enigmatic. At the same time, the potential importance of the truncated receptors in the development, maintenance, and regeneration of the nervous system has been highlighted by recent developmental and injury paradigm investigations. Here we have used trkB cDNA transfected cell lines to demonstrate that both trkB.T1 and trkB.T2 are capable of mediating BDNF-induced signal transduction. More specifically, BDNF activation of either trkB.T1 or trkB.T2 increases the rate of acidic metabolite release from the cell, a common physiological consequence of many signaling pathways. Further, these trkB.T1- and trkB. T2-mediated changes occur with kinetics distinct from changes mediated by trkB.FL, suggesting the participation of at least some unique rate-limiting component or components. Mutational analysis demonstrates that the isoform-specific sequences within the intracellular domains of each receptor are essential for signaling capability. Finally, inhibitor studies suggest that kinases are likely to be involved in the trkB.T1 and trkB.T2 signaling pathways.
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Affiliation(s)
- G T Baxter
- Molecular Devices Corporation, Sunnyvale, California 94089, USA
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37
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Valenzuela P. [Usefulness of studies on antitubercular drug resistance]. Rev Panam Salud Publica 1997; 1:62-7. [PMID: 9162582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- P Valenzuela
- Instituto de Salud Pública de Chile, Santiago, Chile
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38
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Valenzuela P. [Usefulness of antituberculosis drug resistance studies]. Rev Med IPSS 1997; 6:73-7. [PMID: 12293698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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Nieto A, Matorras R, Serra M, Valenzuela P. Fluctuation of cardiotocographic tracings during labor in fetal growth retardation. Zentralbl Gynakol 1996; 118:655-8. [PMID: 9082701] [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] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The objective of our study was to analyse the fluctuation of cardiotocographic scores during labor in fetal growth retardation (FGR). The study took place at the University hospital "Principe de Asturias", Alcalá de Henares, Madrid, Spain. 170 at term FGR fetuses and 170 at term fetuses without FGR as control group were compared using modified Fischer scores, which were blindly performed at 3, 5 and 10 cm of cervical dilatation. As results we found out that the mean value of the Fischer score was significantly lower in FGR at 3 cm of cervical dilatation (8.1 +/- 1 vs 8.7 +/- 0.6), as well as at 5 cm (7.6 +/- 0.9 vs 8.1 +/- 0.7) and at 10 cm (6.7 +/- 0.8 vs 7.4 +/- 0.8). Poor prognosis cardiotocograms were also more common in FGR than in the control group in the three cut-offs points studied (7.5% vs 0.6% at 3 cm, 9.8 vs 1.8 at 5 cm and 37.9 vs 11.6 at complete cervical dilatation). The afore mentioned differences were more remarkable as labor advanced. Conclusions are that poor fetal heart rate recordings were detected in FGR at the beginning of labor when compared with control group fetuses and the differences between both groups increased while the labor prolonging.
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Affiliation(s)
- A Nieto
- Hospital Universitario Príncipe de Asturias, Departamento des Especialidades Médicas, Universidad de Alcalá de Henares, Madrid, Spain
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40
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Valenzuela P, Paris E, Oberpauer B, Rios JC, Concha F. Overdose of colchicine in a three-year-old child. Vet Hum Toxicol 1995; 37:366-367. [PMID: 8540232] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We report the case of a previously healthy girl who developed a multi-systemic failure after an inappropriate dose of colchicine. The patient recovered completely and had no residual effects.
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Affiliation(s)
- P Valenzuela
- Department of Pediatrics, Pontificia Universidad Catolica de Chile, Santiago
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41
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Yáñez A, Bachelet M, Valenzuela MT, Valenzuela P, Henríquez A, Child R. [HIV infection and its effects on tuberculosis endemic in Chile]. Bol Oficina Sanit Panam 1995; 119:166-178. [PMID: 7546297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Affiliation(s)
- A Yáñez
- Organización Panamericana de la Salud, Las Condes, Santiago, Chile
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42
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Valenzuela P, Nieto A. 94094771 Progesterone stimulation test and obesity. Maturitas 1995. [DOI: 10.1016/s0378-5122(95)90020-9] [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: 11/25/2022]
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Abstract
OBJECTIVE To analyse the relative effect of the risk factors related to fetal growth retardation (FGR) in the central area of Spain. STUDY DESIGN This is a case-control survey of 370 full-term gestations. Of the 370 women, 185 were diagnosed with intrauterine growth retardation, and 185 were in the normal group. All came from a central region of Spain. We took into account 25 possible risk factors. RESULTS In the FGR group we found 12 risk factors with statistical significance in the univariate analysis (tobacco, drugs, low pre-pregnancy weight, low maternal height, little gestational weight gain, excessive physical activity during pregnancy, low socioeconomic status, low educational level, unmarried, urinary infection, mother's haematological changes, and previous infertility). After the multiple logistic regression analysis, five factors were shown to exist as independent risks (tobacco: OR, 23.50; 95% CI, 3.01-183.18; P < 0.01; low pre-pregnancy weight: OR, 4.01; 95% CI, 2.14-7.51; P < 0.001; low socioeconomic status: OR, 2.91; 95% CI, 1.72-4.90; P < 0.001; little gestational weight gain: OR, 2.52; 95% CI, 1.21-5.22; P < 0.05; and urinary infection: OR, 3.83; 95% CI, 1.49-9.87; P < 0.01). CONCLUSIONS (i) Tobacco, low pre-pregnancy weight and low socioeconomic status are the three main cause-effect factors of relative importance in our sanitary zone for FGR. (ii) Disproportionate FGR is related more to older mothers and maternal previous illness than to the proportionate FRG.
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Affiliation(s)
- A Nieto
- Servicio de Obstetricia y Ginecología, Hospital Principe de Asturias, Universidad de Alcalá de Henares, Madrid, Spain
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Nieto A, Villar J, Matorras R, Serra M, Valenzuela P, Keller J. Intrauterine growth retardation: fluctuation of fetal pH measured between beginning and at the completion of labor. J Perinat Med 1994; 22:329-35. [PMID: 7877070 DOI: 10.1515/jpme.1994.22.4.329] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 01/27/2023]
Abstract
UNLABELLED The aim of this study was to evaluate the fluctuation of fetal pH in blood samples taken at the beginning of labor and at the moment of birth as related to intrauterine growth retardation syndrome. This is a prospective follow-up of term gestations, of which 41 were diagnosed as intrauterine growth retardation (IUGR) and 61 as normal ones. pH was measured in scalp blood sample at the beginning of the labor and in umbilical artery right after birth in both groups respectively. The rate of decrease of pH value in relation to duration of labor was determined for each case. Our results are: 1) Lower baseline pH were found in the IUGR group (pH 7.32 vs 7.34, p < 0.01), lower arterial blood pH at birth/.23 +/- 0.08 vs 7.27 +/- 0.08, p < 0.05). 2) Faster decrease of the pH during the labor (0.019 unit/hour vs 0.012, p < 0.05) as related to IUGR. CONCLUSION IUGR fetuses are more acidotic at the beginning of the labor, and the rate of decrease of the fetal pH per unit of time during the labor is faster at least in a theoretical situation nevertheless it will require more studies if any practical applications are thought of.
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Affiliation(s)
- A Nieto
- Department of Obstetrics and Gynecology, Hospital Principe de Asturias, University of Alcalá de Henares, Madrid, Spain
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Abstract
OBJECTIVES The purpose of this study is to analyze the characteristics of patients identified with the progestin test. METHODS We administered the progestin challenge test to 157 postmenopausal women and compared the characteristics of the patients who bled, with those who did not. RESULTS Bleeding occurred in 14.01% of cases and we found that the number of patients who bled were significantly and independently more overweight, had higher levels of plasma estradiol, had a clear presence of superficial cells in the vaginal epithelium and had been menopausal for fewer years than those who did not bleed. CONCLUSIONS We concluded that the test identifies women at risk from hormone-related endometrial cancer.
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Affiliation(s)
- P Valenzuela
- Department of Obstetrics and Gynecology, Hospital Universitario Principe de Asturias, Alcalá de Henares, Madrid, Spain
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46
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Fajuri A, Rodríguez JA, González R, Jalil J, García E, Molgo M, Soza M, Valenzuela P. [Efficacy and secondary effects of chronic treatment with amiodarone]. Rev Med Chil 1993; 121:516-22. [PMID: 8272632] [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: 01/29/2023]
Abstract
Long-term therapy with amiodarone has been associated with a high incidence of adverse side effects, that precludes its indication for common cardiac arrhythmias. We have prospectively studied 218 patients (pts), aged 32-87 years, under chronic amiodarone therapy that were followed for 2 years and evaluated for efficacy and adverse side effects. Previous amiodarone treatment ranged from 1 to 135 months. Cardiac arrhythmias were paroxysmal AF (PAF) in 120 pts, sustained VT (SVT) in 36 pts, paroxysmal supraventricular tachycardia (PSVT) in 21 pts, unsustained VT (UVT) in 18 pts and miscellaneous in 23 pts. Amiodarone doses ranged from 500 to 4200 mg per week. Amiodarone was effective in 65% of all patients. No difference was observed between efficacy and type of arrhythmia. Dermatologic toxicity was found in 36%, neurologic toxicity in 23%, thyroid toxicity in 13.4% and pulmonary fibrosis en 2.5% of pts. Amiodarone was discontinued routinely when pulmonary toxicity was present. We conclude that amiodarone therapy is effective in a wide spectrum of arrhythmias. Although drug therapy was associated with a high incidence of adverse side effects, these did not preclude continuation of treatment.
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Affiliation(s)
- A Fajuri
- Departamento de Enfermedades Cardiovasculares, Pontificia Universidad Católica de Chile, Santiago de Chile
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47
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Bajo AM, Guijarro LG, Juarranz MG, Valenzuela P, Martinez P, Prieto JC. Stimulation of the adenylyl cyclase activity in human endometrial membranes by VIP and related peptides. Biosci Rep 1993; 13:69-77. [PMID: 8397008 DOI: 10.1007/bf01145959] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Vasoactive intestinal peptide (VIP) has been shown to stimulate adenylyl cyclase activity in human endometrial membranes. The effect was dependent on the time and temperature of incubation as well as on the concentration of endometrial membrane proteins in the medium. In the presence of 1 microM GTP, half-maximal stimulation of adenylyl cyclase activity was observed at 25.0 +/- 7.0 nM VIP, whereas the maximal activity (at 1 microM VIP) corresponded to an increase of about 140% with respect to basal values (7.5 +/- 0.6 pmol cyclic AMP/min/mg of protein). However, the maximal stimulation of adenylyl cyclase activity was obtained with helodermin (1 microM) that increased the activity by 170% over the basal. The relative potency of VIP-related peptides upon the adenylyl cyclase activity was: helodermin (ED50 = 1.8 +/- 1.4 nM) > VIP (ED50 = 25.0 +/- 7.0 nM) > PHI (ED50 = 725.0 +/- 127.2 nM). Secretin had a faint effect upon the adenylyl cyclase activity and glucagon was completely inefficient at this level. The presence of alpha s and alpha i subunits of G proteins in human endometrium was detected by immunoblot. Preliminary results showed the presence of two classes of 125I-VIP receptors in human endometrial membranes with the following stoichoimetric parameters: high affinity receptor (Kd = 2.0 nM, binding capacity 0.1 pmol VIP/mg protein) and low affinity receptor (Kd = 0.43 microM, binding capacity 13.1 pmol VIP/mg protein). The present results together with the known presence of VIP in human uterus and the actions of this neuropeptide in the adjacent myometrial tissue support the idea that VIP and related peptides may have a role in human endometrium.
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Affiliation(s)
- A M Bajo
- Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá, Alcalá de Henares, Spain
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48
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Abstract
The use of artificial urinary sphincter around the urethra or bladder neck for the management of urinary incontinence secondary to intrinsic urethral sphincter deficiency is now well accepted. However, its use around the bowel to serve as a sphincter in urinary pouches is still anecdotal. Its use in experimental models has been met with failure because of ischemic bowel necrosis at the cuff site. To obviate these difficulties, a new technique was devised using a flap of rectus muscle that acted as a cushion between the cuff and the bowel wall. Results in five dogs showed that bowel wall ischemia is avoided with cuff pressure of 51-60 cm applied constantly for four weeks while providing pressure to leak around the closed cuff with a pressure of 62-75 cm water. Further study is needed to confirm the long-term effect of this technique on the bowel wall and the ability of the sphincter to maintain continence.
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Affiliation(s)
- G Devendra
- Department of Urology, William Beaumont Hospital, Royal Oak, Michigan
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Kiefer MC, Baird A, Nguyen T, George-Nascimento C, Mason OB, Boley LJ, Valenzuela P, Barr PJ. Molecular cloning of a human basic fibroblast growth factor receptor cDNA and expression of a biologically active extracellular domain in a baculovirus system. Growth Factors 1991; 5:115-27. [PMID: 1662973 DOI: 10.3109/08977199109000276] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A cDNA clone encoding a human fibroblast growth factor (FGF) receptor was isolated from a hepatoma cell line cDNA library. The cDNA encodes a three immunoglobulinlike-domain FGF receptor that is similar to a human placental FGF receptor cDNA but lacks two amino acids. The variation observed at these two amino acids, also seen in the two immunoglobulinlike-domain FGF-receptors, can be explained by an alternate splicing mechanism. We have used a baculovirus expression system to produce high levels of a soluble, extracellular domain form of the FGF receptor (EC-FGF receptor). Spodoptera frugiperda (Sf9) insect cells infected with recombinant EC-FGF receptor viruses synthesized and secreted an EC-FGF receptor of apparent Mr = 58,000. The EC-FGF receptor purified from conditioned media of infected Sf9 cells by lentil lectin affinity chromatography was shown to bind basic FGF with high affinity (Kd = 1-5 nM), to inhibit the binding of radioiodinated basic FGF to its high affinity receptor and to inhibit endothelial cell proliferation. Furthermore, binding of basic FGF to the EC-FGF receptor was shown to be significantly enhanced by heparin. The availability of biologically active FGF receptors will allow an analysis of their interaction with members of the FGF family of proteins and viruses of the herpes family that have been shown to use the FGF receptor system for cell entry.
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Affiliation(s)
- M C Kiefer
- Chiron Corporation, Emeryville, CA 94608
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50
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Méndez B, Valenzuela P. Recombinant yeast as a production system in biotechnology. Bioprocess Technol 1991; 13:16-53. [PMID: 1367133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Affiliation(s)
- B Méndez
- Chiron Corporation, Emeryville, California
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