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Guberina M, Guberina N, Hoffmann C, Gogishvili A, Freisleben F, Herz A, Hlouschek J, Gauler T, Lang S, Stähr K, Höing B, Pöttgen C, Indenkämpen F, Santiago A, Khouya A, Mattheis S, Stuschke M. Prospects for online adaptive radiation therapy (ART) for head and neck cancer. Radiat Oncol 2024; 19:4. [PMID: 38191400 PMCID: PMC10775598 DOI: 10.1186/s13014-023-02390-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 12/12/2023] [Indexed: 01/10/2024] Open
Abstract
BACKGROUND The aim of the present study is to examine the impact of kV-CBCT-based online adaptive radiation therapy (ART) on dosimetric parameters in comparison to image-guided-radiotherapy (IGRT) in consecutive patients with tumors in the head and neck region from a prospective registry. METHODS The study comprises all consecutive patients with tumors in the head and neck area who were treated with kV-CBCT-based online ART or IGRT-modus at the linear-accelerator ETHOS™. As a measure of effectiveness, the equivalent-uniform-dose was calculated for the CTV (EUDCTV) and organs-at-risk (EUDOAR) and normalized to the prescribed dose. As an important determinant for the need of ART the interfractional shifts of anatomic landmarks related to the tongue were analyzed and compared to the intrafractional shifts. The latter determine the performance of the adapted dose distribution on the verification CBCT2 postadaptation. RESULTS Altogether 59 consecutive patients with tumors in the head-and-neck-area were treated from 01.12.2021 to 31.01.2023. Ten of all 59 patients (10/59; 16.9%) received at least one phase within a treatment course with ART. Of 46 fractions in the adaptive mode, irradiation was conducted in 65.2% of fractions with the adaptive-plan, the scheduled-plan in the remaining. The dispersion of the distributions of EUDCTV-values from the 46 dose fractions differed significantly between the scheduled and adaptive plans (Ansari-Bradley-Test, p = 0.0158). Thus, the 2.5th percentile of the EUDCTV-values by the adaptive plans amounted 97.1% (95% CI 96.6-99.5%) and by the scheduled plans 78.1% (95% CI 61.8-88.7%). While the EUDCTV for the accumulated dose distributions stayed above 95% at PTV-margins of ≥ 3 mm for all 8 analyzed treatment phases the scheduled plans did for margins ≥ 5 mm. The intrafractional anatomic shifts of all 8 measured anatomic landmarks were smaller than the interfractional with overall median values of 8.5 mm and 5.5 mm (p < 0.0001 for five and p < 0.05 for all parameters, pairwise comparisons, signed-rank-test). The EUDOAR-values for the larynx and the parotid gland were significantly lower for the adaptive compared with the scheduled plans (Wilcoxon-test, p < 0.001). CONCLUSIONS The mobile tongue and tongue base showed considerable interfractional variations. While PTV-margins of 5 mm were sufficient for IGRT, ART showed the potential of decreasing PTV-margins and spare dose to the organs-at-risk.
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Affiliation(s)
- Maja Guberina
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
- German Cancer Consortium (DKTK), Partner Site University Hospital Essen, Essen, Germany
| | - Nika Guberina
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany.
- German Cancer Consortium (DKTK), Partner Site University Hospital Essen, Essen, Germany.
| | - C Hoffmann
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - A Gogishvili
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - F Freisleben
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - A Herz
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - J Hlouschek
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - T Gauler
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - S Lang
- Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Essen, Essen, Germany
| | - K Stähr
- Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Essen, Essen, Germany
| | - B Höing
- Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Essen, Essen, Germany
| | - C Pöttgen
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - F Indenkämpen
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - A Santiago
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - A Khouya
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - S Mattheis
- Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Essen, Essen, Germany
| | - M Stuschke
- Department of Radiotherapy, West German Cancer Center, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany
- German Cancer Consortium (DKTK), Partner Site University Hospital Essen, Essen, Germany
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Mongelos MA, Sosa FN, Pineda GE, Fiorentino G, Santiago A, Abelleyro MM, Rossetti LC, Exeni R, De Brasi CD, Palermo MS, Ramos MV. Assessment of interleukin-10 promoter variant (-1082A/G) and cytokine production in patients with hemolytic uremic syndrome. Front Pediatr 2023; 11:1210158. [PMID: 37425258 PMCID: PMC10327435 DOI: 10.3389/fped.2023.1210158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 06/07/2023] [Indexed: 07/11/2023] Open
Abstract
Introduction Hemolytic uremic syndrome (HUS) is a condition that results in acute kidney failure mainly in children, which is caused by Shiga toxin-producing Escherichia coli and inflammatory response. Although anti-inflammatory mechanisms are triggered, studies on the implication in HUS are scarce. Interleukin-10 (IL-10) regulates inflammation in vivo, and the interindividual differences in its expression are related to genetic variants. Notably, the single nucleotide polymorphism (SNP) rs1800896 -1082 (A/G), located in the IL-10 promoter, regulates cytokine expression. Methods Plasma and peripheral blood mononuclear cells (PBMC) were collected from healthy children and HUS patients exhibiting hemolytic anemia, thrombocytopenia, and kidney damage. Monocytes identified as CD14+ cells were analyzed within PBMC by flow cytometry. IL-10 levels were quantified by ELISA, and SNP -1082 (A/G) was analyzed by allele-specific PCR. Results Circulating IL-10 levels were increased in HUS patients, but PBMC from these patients exhibited a lower capacity to secrete this cytokine compared with those from healthy children. Interestingly, there was a negative association between the circulating levels of IL-10 and inflammatory cytokine IL-8. We observed that circulating IL-10 levels were threefold higher in HUS patients with -1082G allele in comparison to AA genotype. Moreover, there was relative enrichment of GG/AG genotypes in HUS patients with severe kidney failure. Discussion Our results suggest a possible contribution of SNP -1082 (A/G) to the severity of kidney failure in HUS patients that should be further evaluated in a larger cohort.
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Affiliation(s)
- Micaela Aldana Mongelos
- Laboratorio de Patogénesis e Inmunología de Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)—Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Fernando Nicolás Sosa
- Laboratorio de Patogénesis e Inmunología de Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)—Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Gonzalo Ezequiel Pineda
- Laboratorio de Patogénesis e Inmunología de Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)—Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Gabriela Fiorentino
- Laboratorio de Patogénesis e Inmunología de Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)—Academia Nacional de Medicina, Buenos Aires, Argentina
- Departamento de Nefrología, Diálisis y Trasplante, Hospital del Niño Prof. Dr. Ramón Exeni, San Justo, Argentina
| | - Adriana Santiago
- Departamento de Nefrología, Diálisis y Trasplante, Hospital del Niño Prof. Dr. Ramón Exeni, San Justo, Argentina
| | - Miguel Martín Abelleyro
- Laboratorio de Genética Molecular de la Hemofilia, Instituto de Medicina Experimental (CONICET)—Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Liliana Carmen Rossetti
- Laboratorio de Genética Molecular de la Hemofilia, Instituto de Medicina Experimental (CONICET)—Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Ramón Exeni
- Departamento de Nefrología, Diálisis y Trasplante, Hospital del Niño Prof. Dr. Ramón Exeni, San Justo, Argentina
| | - Carlos Daniel De Brasi
- Laboratorio de Genética Molecular de la Hemofilia, Instituto de Medicina Experimental (CONICET)—Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Marina Sandra Palermo
- Laboratorio de Patogénesis e Inmunología de Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)—Academia Nacional de Medicina, Buenos Aires, Argentina
| | - María Victoria Ramos
- Laboratorio de Patogénesis e Inmunología de Procesos Infecciosos, Instituto de Medicina Experimental (CONICET)—Academia Nacional de Medicina, Buenos Aires, Argentina
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Guberina M, Santiago A, Pöttgen C, Indenkämpen F, Lübcke W, Qamhiyeh S, Gauler T, Hoffmann C, Guberina N, Stuschke M. Respiration-controlled radiotherapy in lung cancer: Systematic evaluation of the optimal application practice. Clin Transl Radiat Oncol 2023; 40:100628. [PMID: 37138702 PMCID: PMC10149340 DOI: 10.1016/j.ctro.2023.100628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 04/05/2023] [Accepted: 04/15/2023] [Indexed: 05/05/2023] Open
Abstract
Background and purpose Definitive radiochemotherapy (RCT) for non-small cell lung cancer (NSCLC) in UICC/TNM I-IVA (singular, oligometastatic) is one of the treatment methods with a potentially curative concept. However, tumour respiratory motion during RT requires exact pre-planning. There are various techniques of motion management like creating internal target volume (ITV), gating, inspiration breath-hold and tracking. The primary goal is to cover the PTV with the prescribed dose while at the same time maximizing dose reduction of surrounding normal tissues (organs at risk, OAR). In this study, two standardized online breath-controlled application techniques used alternately in our department are compared with respect to lung and heart dose. Materials and methods Twenty-four patients who were indicated for thoracic RT received planning CTs in voluntary deep inspiration breath-hold (DIBH) and in free shallow breathing, prospectively gated in expiration (FB-EH). A respiratory gating system by Varian (Real-time Position Management, RPM) was used for monitoring. OAR, GTV, CTV and PTV were contoured on both planning CTs. The PTV margin to the CTV was 5 mm in the axial and 6-8 mm in the cranio-caudal direction. The consistency of the contours was checked by elastic deformation (Varian Eclipse Version 15.5). RT plans were generated and compared in both breathing positions using the same technique, IMRT over fixed irradiation directions or VMAT. The patients were treated in a prospective registry study with the approval of the local ethics committee. Results The PTV in expiration (FB-EH) was on average significantly smaller than the PTV in inspiration (DIBH): for tumours in the lower lobe (LL) 431.5 vs. 477.6 ml (Wilcoxon test for connected samples; p = 0.004), in the upper lobe (UL) 659.5 vs. 686.8 ml (p = 0.005). The intra-patient comparison of plans in DIBH and FB-EH showed superiority of DIBH for UL-tumours and equality of DIBH and FB-EH for LL-tumours. The dose for OAR in UL-tumours was lower in DIBH than in FB-EH (mean lung dose p = 0.011; lungV20, p = 0.002; mean heart dose p = 0.016). The plans for LL-tumours in FB-EH showed no difference in OAR compared to DIBH (mean lung dose p = 0.683; V20Gy p = 0.33; mean heart dose p = 0.929). The RT setting was controlled online for each fraction and was robustly reproducible in FB-EH. Conclusion RT plans for treating lung tumours implemented depend on the reproducibility of the DIBH and advantages of the respiratory situation with respect to OAR. The primary tumour localization in UL correlates with advantages of RT in DIBH, compared to FB-EH. For LL-tumours there is no difference between RT in FB-EH and RT in DIBH with respect to heart or lung exposure and therefore, reproducibility is the dominant criterion. FB-EH is recommended as a very robust and efficient technique for LL-tumours.
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Affiliation(s)
- M. Guberina
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
- German Consortium for Translational Cancer Research, Deutsches Konsortium für Translationale Krebsforschung (DKTK), Partner Site University Hospital Essen, Deutsche Krebsforschungszentrum (DKFZ), Essen, Germany
- Corresponding author at: Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Hufealndstr. 55, Essen 45147, Germany.
| | - A. Santiago
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
- Medical Physics, Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
| | - C. Pöttgen
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
| | - F. Indenkämpen
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
- Medical Physics, Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
| | - W. Lübcke
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
- Medical Physics, Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
| | - S. Qamhiyeh
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
- Medical Physics, Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
| | - T. Gauler
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
| | - C. Hoffmann
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
| | - N. Guberina
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
| | - M. Stuschke
- Department for Radiotherapy, University Hospital Essen, West German Cancer Center, University Duisburg-Essen, Essen, Germany
- German Consortium for Translational Cancer Research, Deutsches Konsortium für Translationale Krebsforschung (DKTK), Partner Site University Hospital Essen, Deutsche Krebsforschungszentrum (DKFZ), Essen, Germany
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Ramírez F, Exeni A, Alconcher L, Coccia P, García Chervo L, Suarez Á, Martin S, Caminiti A, Santiago A. [Clinical practice guideline for the diagnosis and management of urinary tract infections: 2022 update]. ARCH ARGENT PEDIATR 2022; 120:S69-S87. [PMID: 36190229 DOI: 10.5546/aap.2022.s69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Accepted: 03/28/2022] [Indexed: 11/12/2022]
Abstract
In 2015, the "New recommendations regarding the current controversies in urinary infection" were published in the Archivos Argentinos de Pediatría. Given the fact that in these past years, new evidence has emerged regarding the diagnosis and treatment of urinary infection, the Pediatric Nephrology Committee of Sociedad Argentina de Pediatría has decided to update these recommendations. The main goal is to provide the pediatrician with the necessary tools to make a correct diagnosis, define the most appropriate treatment, select the patients who will benefit from antibiotic prophylaxis, and decide which imaging studies will be necessary, avoiding costly and invasive interventions. These guidelines also include the management of children with urinary tract infections associated with special situations such as: bladder bowel dysfunction, the newborn, children with neurogenic bladder, kidney transplant patients and fungal urinary tract infections.
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Affiliation(s)
- Flavia Ramírez
- Comité de Nefrología, Sociedad Argentina de Pediatría
- Hospital Provincial de Neuquén Dr. Eduardo Castro Rendón, Neuquén, Argentina
| | - Andrea Exeni
- Comité de Nefrología, Sociedad Argentina de Pediatría
- Hospital Interzonal General de Agudos José Penna, Bahía Blanca, Argentina
| | - Laura Alconcher
- Comité de Nefrología, Sociedad Argentina de Pediatría
- Hospital Universitario Austral, Pilar, Argentina
| | - Paula Coccia
- Comité de Nefrología, Sociedad Argentina de Pediatría
- Hospital Italiano de Buenos Aires, Argentina
| | - Laura García Chervo
- Comité de Nefrología, Sociedad Argentina de Pediatría
- Hospital Nacional de Pediatría Juan P Garrahan, Ciudad Autónoma de Buenos Aires, Argentina
| | - Ángela Suarez
- Comité de Nefrología, Sociedad Argentina de Pediatría
- Hospital de Niños Sor María Ludovica, La Plata, Argentina
| | - Sandra Martin
- Comité de Nefrología, Sociedad Argentina de Pediatría
- Hospital de General de Niños Pedro de Elizalde, Ciudad Autónoma de Buenos Aires, Argentina
| | - Alejandra Caminiti
- Comité de Nefrología, Sociedad Argentina de Pediatría
- Hospital de Niños Dr. J. Vilela, Rosario, Argentina
| | - Adriana Santiago
- Comité de Nefrología, Sociedad Argentina de Pediatría
- Hospital del Niño de San Justo, Profesor Dr. Ramón Exeni, San Justo, Argentina
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Alvarez Cifuentes G, Santiago A, Mendez L, Fueyo M, López Martínez E, Soria R, Martín López I, Durán N, Álvarez R, Lago C, Otero Gonzalez A, Diñeiro M, Capín R, Cadiñanos J, Cabanillas R. 87P ctDNA analysis as a prognostic factor for early-stage and oligometastatic patients treated with radiotherapy. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.119] [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] Open
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Hann A, Santiago A, Galipeau HJ, Constante M, Jackson K, Bercik P, Verdu E. A144 CHRONIC DSS LEADS TO ALTERED EXPRESSION OF IRAK4/TPL2 PATHWAYS IN UC-COLONIZED MICE. J Can Assoc Gastroenterol 2022. [PMCID: PMC8859237 DOI: 10.1093/jcag/gwab049.143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Background Ulcerative colitis (UC) is one of two forms of inflammatory bowel disease (IBD). The exact cause of IBD is unknown but altered host-microbe interactions and genetic susceptibility are involved in its pathogenesis. Many patients with IBD do not respond to biological therapies targeting single cytokines, therefore new therapies that target common immune pathways are being developed and need to be tested in relevant preclinical models. Previously we have shown that mice colonized with UC microbiota upregulated genes related to inflammation without induction of colitis compared to healthy volunteer-colonized mice. We thus investigated whether IRAK4 and TPL2-induced pathways, new therapeutic targets in development upstream of inflammatory cytokine gene activation, are upregulated in mice colonized with UC microbiota and chronic colitis. Aims Our aim was to characterize TPL2 and IRAK4 signalling pathways and T cell phenotypes in UC-colonized mice following chronic low-dose dextran sodium sulfate (DSS) colitis. Methods 10-16-week-old germ-free C57BL/6 mice were colonized with fecal microbiota from a patient with UC experiencing a flare (n=16). Mice were housed in a gnotobiotic facility during the experiment. Three weeks following colonization, colitis was induced in half of the mice by three cycles (5 d each; 2.0%, 1.5% and 1.5%, respectively) of DSS in drinking water with a 5-d wash-out period between cycles. All mice were fed a control diet (7004, Teklad). Fecal samples were collected weekly. At sacrifice, disease activity (colon length, occult blood in feces, stool consistency, and spleen weight) was measured and colon tissue was collected for histological analysis and RNA sequencing. Mesenteric lymph nodes (MLNs) were acquired for flow cytometry to analyze T cell phenotypes. Results In UC-colonized mice, chronic low-dose DSS induced softer feces (p<0.0001), shorter colon length (p<0.0001), and increased spleen weight (p<0.0001), compared with water treated mice. This was paralleled by detectable blood in stool, development of moderate colitis (DSS: 1.9+/-1.4 vs H2O: 0.5+/-0.2; p<0.02) and higher proportion of IL-17 (p=0.003) and IFN-γ-producing T cells (p=0.06) in MLNs compared with water treated mice. RNA sequencing revealed that inflammatory genes, mainly related to the IRAK4/TPL2 pathway (e.g., Gadd45b, Socs3, Il1b), were significantly increased (p≤0.05) in the colon of mice treated with DSS compared with water. Conclusions When challenged with a chronic low-dose chemical injury agent, mice colonized with UC microbiota develop clinical and histological signs of colitis and upregulation of genes involved in inflammation like Gadd45b, Socs3, and Il1b. Thus, this model represents a new valuable tool for preclinical testing of new drug candidates, such as those related to the modulation of IRAK4/TPL2 pathways. Funding Agencies CCC
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Affiliation(s)
- A Hann
- McMaster University, Hamilton, ON, Canada
| | - A Santiago
- McMaster University, Hamilton, ON, Canada
| | | | | | - K Jackson
- McMaster University, Hamilton, ON, Canada
| | - P Bercik
- Medicine, McMaster University, Hamilton, ON, Canada
| | - E Verdu
- McMaster University, Hamilton, ON, Canada
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Ryan CT, Santiago A, Tariq N, Lamba HK. Effect of Laparoscopic Sleeve Gastrectomy on Heart Transplant Status in 4 Patients with Left Ventricular Assist Devices. Tex Heart Inst J 2021; 47:284-289. [PMID: 33472222 DOI: 10.14503/thij-19-7161] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Bariatric surgery helps many morbidly obese patients lose substantial weight. However, few data exist on its long-term safety and effectiveness in patients who also have continuous-flow left ventricular assist devices and in whom heart transplantation is contemplated. We retrospectively identified patients at our institution who had undergone ventricular assist device implantation and subsequent laparoscopic sleeve gastrectomy from June 2015 through September 2017, and we evaluated their baseline demographic data, preoperative characteristics, and postoperative outcomes. Four patients (3 men), ranging in age from 32 to 44 years and in body mass index from 40 to 57, underwent sleeve gastrectomy from 858 to 1,849 days after left ventricular assist device implantation to treat nonischemic cardiomyopathy. All had multiple comorbidities. At a median follow-up duration of 42 months (range, 24-47 mo), median body mass index decreased to 31.9 (range, 28.3-44.3) at maximal weight loss, with a median percentage of excess body mass index lost of 72.5% (range, 38.7%-87.4%). After achieving target weight, one patient was listed for heart transplantation, another awaited listing, one was kept on destination therapy because of positive drug screens, and one regained weight and remained ineligible. On long-term follow-up, laparoscopic sleeve gastrectomy appears to be safe and feasible for morbidly obese patients with ventricular assist devices who must lose weight for transplantation consideration. Additional studies are warranted to evaluate this weight-loss strategy after transplantation and immunosuppression.
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Affiliation(s)
- Christopher T Ryan
- Division of Cardiothoracic Transplantation and Mechanical Circulatory Support, Department of Surgery; Baylor College of Medicine, Houston, Texas 77030
| | - Adriana Santiago
- Division of Cardiothoracic Transplantation and Mechanical Circulatory Support, Department of Surgery; Baylor College of Medicine, Houston, Texas 77030
| | - Nabil Tariq
- Bariatric and Metabolic Surgery Center, Department of Surgery; Baylor College of Medicine, Houston, Texas 77030
| | - Harveen K Lamba
- Division of Cardiothoracic Transplantation and Mechanical Circulatory Support, Department of Surgery; Baylor College of Medicine, Houston, Texas 77030
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Lamba HK, Kim M, Santiago A, Hudson S, Civitello AB, Nair AP, Loor G, Shafii AE, Liao KK, Chatterjee S. Extracorporeal membrane oxygenation as a bridge to durable left ventricular assist device implantation in INTERMACS-1 patients. J Artif Organs 2021; 25:16-23. [PMID: 33982206 DOI: 10.1007/s10047-021-01275-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 04/28/2021] [Indexed: 11/24/2022]
Abstract
Left ventricular assist devices (LVADs) are increasingly used as destination therapy or as a bridge to future cardiac transplant in patients with end-stage heart failure. Extracorporeal membrane oxygenation (ECMO) can be used to bridge patients in cardiogenic shock or with decompensated heart failure to durable mechanical circulatory support. We assessed outcomes in patients in critical cardiogenic shock (Interagency Registry for Mechanically Assisted Circulatory Support [INTERMACS] profile 1) who underwent implantation of a continuous-flow (CF)-LVAD, with or without preoperative ECMO bridging. For this retrospective study, we selected INTERMACS profile 1 patients who underwent CF-LVAD implantation at our institution between Sep 1, 2004 and Nov 30, 2018. Of 768 patients identified, 133 (17.3%) were INTERMACS profile 1; 26 (19.5%) received preoperative ECMO support, and 107 (80.5%) did not. Postimplantation outcomes were compared between the ECMO and no-ECMO groups. No significant differences were found in 30-day mortality (15.4 vs. 15.9%, P = 0.95) or survival at 1 year (53.8 vs. 60.9%, P = 0.51). Three patients who received ECMO before CF-LVAD implantation subsequently underwent cardiac transplant. In the ECMO group, the lactate level 1 day after ECMO initiation was lower in survivors than nonsurvivors (2.7 ± 2.2 vs. 7.4 ± 4.2 mmol/L, P = 0.02; area under the curve = 0.85, P = 0.01) after CF-LVAD implantation. Bridging with ECMO to CF-LVAD implantation in carefully selected INTERMACS profile 1 patients (those who are at the highest risk for critical cardiogenic shock and for whom palliation may be the only other option) produced acceptable postoperative outcomes.Field of research: Artificial lung/ECMO.
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Affiliation(s)
- Harveen K Lamba
- Division of Cardiothoracic Transplantation and Circulatory Support, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Mary Kim
- Division of Cardiothoracic Transplantation and Circulatory Support, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Adriana Santiago
- Division of Cardiothoracic Transplantation and Circulatory Support, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Samuel Hudson
- Division of Cardiothoracic Transplantation and Circulatory Support, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Andrew B Civitello
- Division of Cardiothoracic Transplantation and Circulatory Support, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA.,Department of Cardiopulmonary Transplantation and the Center for Cardiac Support, Texas Heart Institute, Houston, TX, 77030, USA
| | - Ajith P Nair
- Division of Cardiothoracic Transplantation and Circulatory Support, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Gabriel Loor
- Division of Cardiothoracic Transplantation and Circulatory Support, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA.,Division of Cardiovascular Surgery, Texas Heart Institute, Houston, TX, 77030, USA
| | - Alexis E Shafii
- Division of Cardiothoracic Transplantation and Circulatory Support, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA.,Division of Cardiovascular Surgery, Texas Heart Institute, Houston, TX, 77030, USA
| | - Kenneth K Liao
- Division of Cardiothoracic Transplantation and Circulatory Support, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA.,Division of Cardiovascular Surgery, Texas Heart Institute, Houston, TX, 77030, USA
| | - Subhasis Chatterjee
- Division of General Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA. .,Division of Cardiothoracic Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, 77030, USA. .,Division of Cardiovascular Surgery, Texas Heart Institute, Houston, TX, 77030, USA.
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9
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Galipeau HJ, CAMINERO FERNANDEZ A, Turpin W, Bermudez-Brito M, Santiago A, Libertucci J, Constante M, Raygoza Garay J, Rueda GH, Clarizio AV, Smith MI, Surette M, Bercik P, Croitoru K, Verdu E. A29 NOVEL FECAL BIOMARKERS THAT PRECEDE CLINICAL DIAGNOSIS OF ULCERATIVE COLITIS. J Can Assoc Gastroenterol 2021. [DOI: 10.1093/jcag/gwab002.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Altered gut microbiota composition and function has been associated with inflammatory bowel diseases (IBD) including ulcerative colitis (UC), but causality and mechanisms remain unknown. Most studies have examined patients with active or treated disease and little is known about microbial compositional or functional changes that occur before disease onset.
Aims
We studied a longitudinal cohort of subjects at risk for IBD to define the fecal microbial composition and function in subjects prior to UC onset (pre-UC) and at diagnosis (post-UC), and in matched at-risk subjects that remained healthy.
Methods
Fecal samples were collected from healthy individuals at-risk for IBD (pre-UC; n=13) and subjects were followed longitudinally until UC diagnosis (post-UC, n=9), at which point another fecal sample was collected. Fecal samples from a cohort of matched at-risk individuals that did not develop UC were used as healthy controls (n=48). We applied 16S rRNA gene sequencing, next generation shotgun sequencing, in vitro proteolytic assays and gnotobiotic colonizations to define the microbial composition and proteolytic function in fecal samples.
Results
The microbiota of post-UC subjects clustered separately from pre-UC and HC subjects, based on bray-curtis and unweighted UniFrac, had reduced alpha-diversity, and had reduced abundance of Aldercreutzia compared to pre-UC and HC. In vitro functional analysis revealed increased fecal proteolytic and elastase activity in pre-UC and post-UC samples compared to HC. Metagenomics identified pathways and gene families related to protein metabolism and proteases/peptides that were significantly different between HC and pre-UC samples, suggesting a bacterial component to the pre-UC proteolytic signature. Elastase activity inversely correlated with the relative abundance of Adlercreutzia, and other potentially beneficial taxa, and directly correlated with Bacteroides vulgatus, a known proteolytic taxon. High elastase activity was confirmed in Bacteroides isolates from fecal samples. Bacterial contribution and functional significance of the proteolytic signature was investigated in germ-free adults and litters born from dams colonized with HC, pre-UC or post-UC microbiota. Mice colonized with pre-UC microbiota at adulthood or neonatally developed higher fecal proteolytic activity and an inflammatory immune tone compared with HC colonized mice.
Conclusions
We have identified increased fecal proteolytic activity that precedes clinical diagnosis of UC and associates with gut microbiota changes. This may constitute a non-invasive biomarker of inflammation to monitor at-risk populations that can be targeted therapeutically with anti-proteases.
Funding Agencies
CAG, CCC, CIHR
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Affiliation(s)
- H J Galipeau
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - A CAMINERO FERNANDEZ
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - W Turpin
- University of Toronto, Toronto, ON, Canada
| | - M Bermudez-Brito
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - A Santiago
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - J Libertucci
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - M Constante
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | | | - G H Rueda
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - A V Clarizio
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - M I Smith
- Zane Cohen Centre for Digestive Diseases, Mount Sinai, Toronto, ON, Canada
| | - M Surette
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - P Bercik
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - K Croitoru
- Zane Cohen Centre for Digestive Diseases, Mount Sinai, Toronto, ON, Canada
| | - E Verdu
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
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10
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Andre CJ, Mendelevich E, Santiago A, Spencer RM. 0207 The Effect of Naps on Inhibitory Control and Sustained Attention in Early Childhood. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Sleep in adults and school-age children has been shown to improve regulatory behaviors. Specifically, slow wave sleep (SWS) disruptions have been positively associated with decreased levels of sustained attention and inhibitory control in adults, while REM sleep has been associated with inhibitory control in typically developing children. However, it is unknown whether midday naps confer a similar benefit in preschool-aged children, particularly since REM sleep is often lacking in their naps. In this study, we used a Go/No-Go task to determine whether SWS during early childhood naps benefits sustained attention and inhibitory control. We also explored nap habituality as a factor given that habitual and non-habitual nappers have different sleep architecture in adults and children.
Methods
Preschool children (N=22, 38–69 months) completed a Go/No-Go task, after which they either napped with polysomnography (nap condition) or stayed awake (wake condition) for an equivalent amount of time (within subject; order counterbalanced; ~1 week apart). After their nap and wake sessions, they completed the Go/No-Go task again.
Results
When controlling for nap frequency, participant performance (accuracy) post-session did not differ across conditions. However, by examining only the habitual nappers (5–7 days/week, N=9), we found a moderate positive correlation between percent of sleep spent in SWS and post-nap accuracy (r=0.335, p=0.037). Interestingly, we did not see the same relationship with non-habitual nappers (0–4 days/week, N=13) and found a weak negative correlation with SWS (r=0.007, p=0.031).
Conclusion
The findings suggest that habitually napping children show a benefit of nap SWS on regulatory behaviors while non-habitual nappers do not. Such results have important translational significance for early education settings.
Support
NIH R01 HL111695.
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Affiliation(s)
- C J Andre
- University of Massachusetts Amherst, Amherst, MA
| | | | - A Santiago
- University of Massachusetts Amherst, Amherst, MA
| | - R M Spencer
- University of Massachusetts Amherst, Amherst, MA
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11
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Levrero-Florencio F, Margara F, Zacur E, Bueno-Orovio A, Wang Z, Santiago A, Aguado-Sierra J, Houzeaux G, Grau V, Kay D, Vázquez M, Ruiz-Baier R, Rodriguez B. Sensitivity analysis of a strongly-coupled human-based electromechanical cardiac model: Effect of mechanical parameters on physiologically relevant biomarkers. Comput Methods Appl Mech Eng 2020; 361:112762. [PMID: 32565583 PMCID: PMC7299076 DOI: 10.1016/j.cma.2019.112762] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The human heart beats as a result of multiscale nonlinear dynamics coupling subcellular to whole organ processes, achieving electrophysiologically-driven mechanical contraction. Computational cardiac modelling and simulation have achieved a great degree of maturity, both in terms of mathematical models of underlying biophysical processes and the development of simulation software. In this study, we present the detailed description of a human-based physiologically-based, and fully-coupled ventricular electromechanical modelling and simulation framework, and a sensitivity analysis focused on its mechanical properties. The biophysical detail of the model, from ionic to whole-organ, is crucial to enable future simulations of disease and drug action. Key novelties include the coupling of state-of-the-art human-based electrophysiology membrane kinetics, excitation-contraction and active contraction models, and the incorporation of a pre-stress model to allow for pre-stressing and pre-loading the ventricles in a dynamical regime. Through high performance computing simulations, we demonstrate that 50% to 200% - 1000% variations in key parameters result in changes in clinically-relevant mechanical biomarkers ranging from diseased to healthy values in clinical studies. Furthermore mechanical biomarkers are primarily affected by only one or two parameters. Specifically, ejection fraction is dominated by the scaling parameter of the active tension model and its scaling parameter in the normal direction ( k ort 2 ); the end systolic pressure is dominated by the pressure at which the ejection phase is triggered ( P ej ) and the compliance of the Windkessel fluid model ( C ); and the longitudinal fractional shortening is dominated by the fibre angle ( ϕ ) and k ort 2 . The wall thickening does not seem to be clearly dominated by any of the considered input parameters. In summary, this study presents in detail the description and implementation of a human-based coupled electromechanical modelling and simulation framework, and a high performance computing study on the sensitivity of mechanical biomarkers to key model parameters. The tools and knowledge generated enable future investigations into disease and drug action on human ventricles.
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Affiliation(s)
- F. Levrero-Florencio
- Department of Computer Science, University of Oxford, Oxford OX1 3QD, United Kingdom
- Corresponding authors.
| | - F. Margara
- Department of Computer Science, University of Oxford, Oxford OX1 3QD, United Kingdom
| | - E. Zacur
- Department of Engineering Science, University of Oxford, Oxford OX3 7DQ, United Kingdom
| | - A. Bueno-Orovio
- Department of Computer Science, University of Oxford, Oxford OX1 3QD, United Kingdom
| | - Z.J. Wang
- Department of Computer Science, University of Oxford, Oxford OX1 3QD, United Kingdom
| | - A. Santiago
- Barcelona Supercomputing Center – Centro Nacional de Supercomputación, Barcelona 08034, Spain
| | - J. Aguado-Sierra
- Barcelona Supercomputing Center – Centro Nacional de Supercomputación, Barcelona 08034, Spain
| | - G. Houzeaux
- Barcelona Supercomputing Center – Centro Nacional de Supercomputación, Barcelona 08034, Spain
| | - V. Grau
- Department of Engineering Science, University of Oxford, Oxford OX3 7DQ, United Kingdom
| | - D. Kay
- Department of Computer Science, University of Oxford, Oxford OX1 3QD, United Kingdom
| | - M. Vázquez
- Barcelona Supercomputing Center – Centro Nacional de Supercomputación, Barcelona 08034, Spain
- ELEM Biotech, Spain
| | - R. Ruiz-Baier
- Mathematical Institute, University of Oxford, Oxford OX2 6GG, United Kingdom
- Universidad Adventista de Chile, Casilla 7-D, Chillan, Chile
| | - B. Rodriguez
- Department of Computer Science, University of Oxford, Oxford OX1 3QD, United Kingdom
- Corresponding authors.
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12
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Galipeau HJ, Turpin W, Caminero Fernandez A, Santiago A, Libertucci J, Bermudez-Brito M, Armstrong S, Bedrani L, Croitoru K, Verdu E. A35 MICROBIAL PROTEOLYTIC SIGNATURE IN ULCERATIVE COLITIS INDUCES AN INFLAMMATORY SIGNATURE IN MICROBIOTA-HUMANIZED MICE. J Can Assoc Gastroenterol 2020. [DOI: 10.1093/jcag/gwz047.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Altered gut microbiota composition has been associated with inflammatory bowel diseases (IBD) including ulcerative colitis (UC), but causality and bacterially-driven mechanisms, are unclear. Proteases within the gastrointestinal tract play a critical role in maintaining homeostasis and are tightly regulated by anti-proteases. Host-derived proteolytic imbalances have been described in IBD, including UC, however, the role of intestinal microbiota as a source of proteases and anti-proteases has largely been ignored.
Aims
To study microbial proteolytic activity and intestinal microbiota profiles in a cohort of individuals at-risk for IBD, and in those individuals that develop UC at follow-up.
Methods
Fecal samples were collected from healthy individuals at-risk for IBD and who went on to develop UC (pre-UC; n=14) and again after UC diagnosis (post-UC, n=10). Fecal samples from matched at-risk individuals that did not develop UC were used as healthy controls (n=52). Overall fecal proteolytic and elastolytic activity was measured. We performed metagenomics sequencing in 4 UC subjects (pre and post) and 4 matched HC using Illumina Hi-Seq from stool DNA. To investigate bacterial origin and functional significance, pregnant germ-free (GF) mice were colonized with a fecal sample from a selected UC subject (pre and post) and a matched HC. Naturally colonized litters were followed for 12 weeks, after which proteolytic activities and signs of inflammation were measured.
Results
Fecal proteolytic and elastase activity was increased in pre- and post-UC samples compared to HCs. Metagenomics revealed over 20k genes were significantly different between HC and pre-UC samples, and of these, 440 related to proteases and peptidases. Increased fecal proteolytic activity, higher lipocalin levels, and increased colonic polymorphonuclear cells in colonic H&E sections was observed in pre- and post-UC colonized mice compared to HC colonized mice. Mice colonized with pre-UC microbiota showed increased mRNA expression of genes linked to immunological disease, antimicrobial and inflammatory responses (ie. Tlr2, Tlr5, Nod2, and Il1b) as compared to HC colonized mice.
Conclusions
These results suggest increased fecal proteolytic activity is observed prior to the onset and clinical diagnosis of UC in patients at-risk for IBD, and upon transfer to mice born from colonized GF dams, low-grade inflammation develops. These pathways could be developed as novel non-invasive biomarkers to monitor at-risk populations. Submitted on behalf of the CCC-GEM Project consortium. Supported by CCC GIA to EF Verdu
Funding Agencies
CCC
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Affiliation(s)
- H J Galipeau
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - W Turpin
- University of Toronto, Toronto, ON, Canada
| | - A Caminero Fernandez
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - A Santiago
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - J Libertucci
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - M Bermudez-Brito
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - S Armstrong
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
| | - L Bedrani
- University of Toronto, Toronto, ON, Canada
| | - K Croitoru
- Mount Sinai Hospital, Toronto, ON, Canada
| | - E Verdu
- Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON, Canada
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13
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Chen HW, Von Euw E, Millan P, Fresco R, Carrez S, Afenjar K, Fung H, Burton M, Santiago A, Guzman R, Villalobos I, Press M, Eiermann W, Slamon D. Results from TRIO030, a pre-surgical tissue-acquisition study to evaluate molecular alterations in human breast cancer tissue following short-term exposure to the androgen receptor antagonist darolutamide. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz239.076] [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: 11/13/2022] Open
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14
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Beaupre RA, Alnajar A, Sugiura T, Chou B, Lamba HK, Kurihara C, Kawabori M, Critsinelis AC, Santiago A, Morgan JA. Device exchange from Heartmate II to HeartWare HVAD. J Card Surg 2019; 34:1204-1207. [PMID: 31478230 DOI: 10.1111/jocs.14229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Despite technological advancements, pump durability and pump-related complications continue to affect and adversely impact the lives of patients with end-stage heart failure on left ventricular assist device (LVAD) support. In an attempt to avoid recurrent LVAD-related complications, there may be circumstances where it is clinically advantageous to exchange a patient's device from HeartMate II to HeartWare HVAD. However, there is a paucity of data that describes the safety and feasibility of such an approach. OBJECTIVE We present the largest single-center series of HeartMate II (HMII) to HeartWare (HVAD) device exchanges. METHODS A retrospective review of 11 patients who underwent HMII to HVAD exchange from 2012 to 2017 was conducted to evaluate patient characteristics, incidence of postoperative complications, and survival. RESULTS Eleven male patients (mean age 55 ± 14.4 years) underwent HMII to HVAD device exchange. One patient expired on postoperative day 7 secondary to sepsis. One patient was lost-to-follow-up after 23 months. An additional three patients died at 5, 7, and 24 months. Mean follow-up after device exchange was 1555 ± 311 days for the remaining six patients. None of the 11 study patients underwent LVAD explant, further device exchange, or heart transplant. CONCLUSION Exchange of an HMII LVAD to an HVAD can be performed safely with acceptable perioperative morbidity and mortality.
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Affiliation(s)
- Rachel A Beaupre
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
| | - Ahmed Alnajar
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
| | - Tadahisa Sugiura
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
| | - Brendan Chou
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
| | - Harveen K Lamba
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
| | - Chitaru Kurihara
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
| | - Masashi Kawabori
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
| | - Andre C Critsinelis
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
| | - Adriana Santiago
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
| | - Jeffrey A Morgan
- Division of Cardiothoracic Transplant and Mechanical Circulatory Support, Baylor College of Medicine, Houston, Texas
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15
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Lamba H, Marcano J, Kurihara C, Kawabori M, Sugiura T, Santiago A, Cheema F, Alnajar A, Civatello A, Delgado R, Simpson L, Nair A, Letsou G, Ghanta R, Rosengart T, Frazier O, Morgan J, George J, Chatterjee. S. Extra-Corporeal Membrane Oxygenation (ECMO) as a Bridge to A Long-Term, Implantable Left Ventricular Assist Device. J Heart Lung Transplant 2018. [DOI: 10.1016/j.healun.2018.01.088] [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: 10/17/2022] Open
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16
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Santiago A, Lamba H, Alnajar A, Cheema F, Hyak J, Conyer R, Kim M, Chou B, Nair A, Oberton S, Ghanta R, George J, Taimeh Z, Civatello A, Frazier O, Morgan J. Evaluation of the CHADS 2 , CHA 2 DS 2 -VASc, and R 2 CHADS 2 Risk Assessment Scores in Continuous Flow LVADs. J Heart Lung Transplant 2018. [DOI: 10.1016/j.healun.2018.01.312] [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: 11/26/2022] Open
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17
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Lamba H, Rubio F, Santiago A, Alnajar A, Cheema F, Civitello A, Delgado R, Simpson L, Ghanta R, Rosengart T, Frazier O, Morgan J, Chatterjee S. Socioeconomic Disparities Do Not Impact Outcomes After Continuous Flow Left Ventricular Assist Device Implantation. J Heart Lung Transplant 2018. [DOI: 10.1016/j.healun.2018.01.994] [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: 11/30/2022] Open
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18
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Lamba H, Santiago A, Hyak J, Kim M, Alnajar A, Kawabori M, Sugira T, Kurihara C, Civitello A, Ono M, Loor G, Frazier O, Cheema FH, Morgan J. Abstract TP392: Evaluation of the CHADS
2
, CHA
2
DS
2
-VASc, and R
2
CHADS
2
Risk Assessment Scores in Continuous Flow LVADs. Stroke 2018. [DOI: 10.1161/str.49.suppl_1.tp392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
The development of stroke while on continuous flow left ventricular assist device (CF-LVAD) remains a source of significant morbidity and mortality. The ability to risk stratify these patients can improve postoperative management.
Objective:
To describe the overall experience of cerebrovascular accidents in CF-LVAD patients at a large volume tertiary center and compare the utility of CHADS
2
, CHA
2
DS
2
-VASc, and R
2
CHADS
2
scores.
Methods:
A retrospective analysis of 522 patients (524 CF-LVADs: HeartMate-II=402; Heartware=122), between 2003 and 2016, was conducted. Post-operative heparin for 2-3 days, warfarin (goal INR 2-3), and 80-325mg aspirin were administered daily. Cerebrovascular vascular accident (CVA) was defined as any focal or global deficit with positive imaging. The CHADS
2
, R
2
CHADS
2
and CHA
2
DS
2
-VASc scores were calculated. Baseline characteristics and risk assessment scores were compared between patients with ischemic CVA (ICVA) and no CVA (nCVA). Kaplan-Meier analysis was conducted.
Results:
Mean age was 54.7±13.6 years, 21.8% were female and 44.8% had ischemic cardiomyopathy. Eighty patients (15.3%) had 98 events of ICVA. Median duration between implant and ICVA was 127 [range 1-2226] days. Hemorrhagic conversion occurred in 9 (9.2%) patients. The CHADS
2
(ICVA=2.4±1.0, nCVA=2.3±1.1, p-value=0.53), CHA
2
DS
2
-VASc (ICVA=3.2±1.3, nCVA=2.9±1.3, p-value=0.08) and R
2
CHADS
2
(ICVA=3.5±1.5, nCVA=3.2±1.6, p-value=0.22) were all higher for ICVA cohort. Patients with multiple ICVAs had a mean CHADS
2
score of 2.5±0.74, CHA
2
DS
2
-VASc score of 3.5±1.1, and R
2
CHADS
2
score of 4±1.2. Freedom from stroke was significantly lower in the CHA
2
DS
2
-VASc ≥3 compared to the CHA
2
DS
2
-VASc <3 [Figure: Kaplan-Meier log-rank p-value=0.009].
Conclusion:
CHA
2
DS
2
-VASc of ≥3 was associated with ICVA in this cohort of CF-LVAD patients. Specifically tailored risk-scores are needed to better predict those at risk for neurological events in CF-LVADs
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Affiliation(s)
- Harveen Lamba
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Adriana Santiago
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Jonathan Hyak
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Mary Kim
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Ahmed Alnajar
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Masashi Kawabori
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Tadahisa Sugira
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Chitaru Kurihara
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Andrew Civitello
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Masahiro Ono
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Gabriel Loor
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - O.H. Frazier
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Faisal H Cheema
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
| | - Jeffrey Morgan
- Baylor College of Medicine at Texas Heart Institute, Houston, TX
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19
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Crittenden J, Nason E, De Caux A, Keys V, Santiago A, Tibby J, Mulvey S, Ryan Z. Screening for Depression in a Coronary Care Unit: A Translational Research Approach. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.773] [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: 10/28/2022]
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20
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Hanf DC, Fasching PA, Villalobos IE, Gasparyan A, Wachter D, Santiago A, Guzman R, Weihbrecht S, Hanf V, Hartmann A, Beckmann MW, Press MF. Abstract P4-12-07: CCND1 amplification in early breast cancer patients: Correlation with subtypes and prognosis. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p4-12-07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Mechanisms of progress and recurrence of early breast cancer (BC) have gained importance since several targeted therapeutic options in metastatic breast cancer have been introduced over the last years, especially in hormone receptor positive BC. This study investigates the amplification of cell cycle regulator cyclin D1 gene (CCND1) amplification as one possible progression mechanism.
Patients & Methods: Patients from an unselected cohort of early BC patients were included into this study. A tissue microarray (TMA) was available for n=832 patients with early breast cancer. CCND1 amplification was assessed after FISH (Abbott Vysis LSI CCND1 SpectumOrange/CEP11 SpectrumGreen Probes Kit). A CCND1/CEP11-ratio ≥ 2.0 was considered as amplification. Staining was successful in 545 tumor cores. Amplification results were correlated with clinical patient and tumor characteristics and survival analyses were performed with regard to distant disease free survival and overall survival.
Results: CCND1 amplification was found in 13.6% of patients. Triple negative, luminal A like, luminal B like and HER2 positive tumors were amplified in 7.5%, 7.8%, 18.6% and 15.7% respectively (p = 0.010). CCDN1 amplification was significantly associated with a higher grading and a higher body mass index. Furthermore an amplification was seen more frequently in lobular BC and ductal BC than other histological subtypes.
Survival analysis showed a reduced DDFS for patients with CCDN1-amplification. 5 year DDFS rates were 90.6% for non-amplified tumors and 86.0% for amplified tumors (p, log-rank =0.066 ). 5 year OS rates were 93.0% for non-amplified tumors and 90.1% for amplified tumors (p, log-rank =0.119).
Adjusted for age, tumor size, nodal status and molecular subtype, cox regression showed HR of 1.3 (95% CI: 0.76-2.5, p=0.46) for DDFS and a HR of 1.33 (95% CI: 0.7-2.53, p=0.38) for OS.
Conclusion: With a 13.6% prevalence in all breast cancer patients, mainly present in luminal B like cancers, CCND1-amplification is a genetic aberration associated with an unfavorable prognosis. Within hormone receptor positive women CCDN1 amplification might play a role in treatment resistance mechanisms in early breast cancer patients.
Citation Format: Hanf DC, Fasching PA, Villalobos IE, Gasparyan A, Wachter D, Santiago A, Guzman R, Weihbrecht S, Hanf V, Hartmann A, Beckmann MW, Press MF. CCND1 amplification in early breast cancer patients: Correlation with subtypes and prognosis [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P4-12-07.
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Affiliation(s)
- DC Hanf
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - PA Fasching
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - IE Villalobos
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - A Gasparyan
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - D Wachter
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - A Santiago
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - R Guzman
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - S Weihbrecht
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - V Hanf
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - A Hartmann
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - MW Beckmann
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
| | - MF Press
- University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA; Breast Center Klinikum Fuerth, Fuerth, Germany; Institute of Pathology, University Hospital Erlangen, Erlangen, Germany
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Batista M, Romero I, Molina J, Brot L, Costa A, López R, Mallol P, Palacios J, Illueca C, Mendes C, Machado G, Santiago A, Rego E, López J, Poveda A. Phosphatidylinositol-4, 5-biphosphate 3-kinase, catalytic subunit alpha (PI3KCA) and microsatellite instability in ovarian clear cell carcinoma, clinical correlation. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw374.30] [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: 11/13/2022] Open
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22
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Zimmerman J, Santiago A, Feinstein R, Fisher M. Do Adolescents with Eating Disorders Meet Recommended Dietary Allowances, Despite their Decreased Calorie Intakes? J Acad Nutr Diet 2016. [DOI: 10.1016/j.jand.2016.06.269] [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: 10/21/2022]
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23
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Wittig A, Ares C, Sakurai H, Santiago A, Jelen U, Engenhart-Cabilic R. SP-0635: Is there a role for proton beam therapy? Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)30741-6] [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: 11/15/2022]
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24
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Santiago A, Jelen U, Ammazzalorso F, Engenhart-Cabilic R, Fritz P, Mühlnickel W, Enghardt W, Baumann M, Wittig A. OC-0340: Reproducibility of target coverage in stereotactic proton lung irradiation under high frequency jet ventilation. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)32646-3] [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: 10/23/2022]
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25
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Salins N, Krishnamurthi N, Santiago A, Dhall R, Moguel-Cobos G, Sadreddin A, Husain S, Lieberman A, Pan D, Dhanani S. Gait and Posture Control Impairments Predict Falls in Parkinson's Disease (P06.049). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p06.049] [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: 11/15/2022] Open
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26
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Lieberman A, Krishnamurthi N, Santiago A, Dhall R, Moguel-Cobos G, Sadreddin A, Husain S, Salins N, Pan D, Dhanani S. Is Difficulty with Balance Different from Difficulty Walking in Parkinson's Disease? (P06.047). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p06.047] [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: 11/15/2022] Open
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27
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Lieberman A, Krishnamurthi N, Santiago A, Dhall R, Moguel-Cobos G, Sadreddin A, Husain S, Salins N, Pan D, Dhanani S. Effects of Bradykinesia and Hypokinesia on Falls in Parkinson's Disease (P06.048). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p06.048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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28
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Husain S, Krishnamurthi N, Santiago A, Dhall R, Moguel-Cobos G, Sadreddin A, Salins N, Pan D, Lieberman A, Dhanani S. The Value of the Barrow Neurological Institute Balance Scale in Predicting Falls (P06.043). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p06.043] [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: 11/15/2022] Open
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29
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Helmbrecht S, Santiago A, Enghardt W, Kuess P, Fiedler F. On the feasibility of automatic detection of range deviations from in-beam PET data. Phys Med Biol 2012; 57:1387-97. [PMID: 22349491 DOI: 10.1088/0031-9155/57/5/1387] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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30
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31
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Mena LM, Muros MA, Palacios H, Moreno MJ, Santiago A, Llamas JM. [Neuroblastoma staging: discrepancies between ¹⁸F-FDG-PET and ¹²³I-MIBG]. An Pediatr (Barc) 2010; 73:363-4. [PMID: 20817583 DOI: 10.1016/j.anpedi.2010.07.009] [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] [Received: 06/28/2010] [Revised: 07/13/2010] [Accepted: 07/15/2010] [Indexed: 11/16/2022] Open
Affiliation(s)
- L M Mena
- UGC Medicina Nuclear, Hospital Universitario Virgen de las Nieves, Granada, España.
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32
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Vega-Estrada J, Flores-Cotera LB, Santiago A, Magaña-Plaza I, Montes-Horcasitas C. Draw-fill batch culture mode for production of xylanases by Cellulomonas flavigena on sugar cane bagasse. Appl Microbiol Biotechnol 2002; 58:435-8. [PMID: 11954788 DOI: 10.1007/s00253-001-0908-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2001] [Accepted: 11/16/2001] [Indexed: 10/27/2022]
Abstract
Draw-fill culture was evaluated as a method for xylanase production by Cellulomonas flavigena on sugar cane bagasse. Specific xylanase activity and volumetric xylanase activities were measured by harvesting 50%, 55%, 60% and 70% of fermented broth at the end of each subculture. Maximum specific (64 IU mg(-1) protein) and volumetric (166 IU ml(-1)) xylanase activities were obtained by harvesting 50-55% of broth. Values were 3.4 and 3.8 times greater than those obtained in batch cultures carried out under the same conditions. Enzyme productivity of 4.2 IU ml(-1) h(-1) was significantly greater than that obtained in continuous cultures (2.4 IU ml(-1) h(-1)) (P<0.05).
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Affiliation(s)
- J Vega-Estrada
- Biotechnology and Bioengineering Department, CINVESTAV-IPN. Av. Instituto Politécnico Nacional, San Pedro Zacatenco, México DF, Mexico
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33
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Santiago A, Fernández-Sein A. Dengue in children: critical points in management. P R Health Sci J 2001; 20:343-6. [PMID: 11845665] [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: 02/23/2023]
Abstract
Dengue fever (DF) is endemic and occasionally epidemic in many tropical and subtropical areas inhabited by the mosquito vector Aedes aegypti. Infection with Dengue may present with varied clinical manifestations. Significant morbidity and mortality can result if early recognition and monitoring of its severe forms (DHF and DSS) is not done and if appropriate medical intervention is delayed. This article reviews several critical points in the basic evaluation and management of dengue in the pediatric age group and present our current approach in the form of a therapeutic algorithm.
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Affiliation(s)
- A Santiago
- Department of Pediatrics, Medical Sciences Campus, University of Puerto Rico School of Medicine, PO Box 365067 San Juan, Puerto Rico 00936-5067
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34
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Tucker RP, Hagios C, Santiago A, Chiquet-Ehrismann R. Tenascin-Y is concentrated in adult nerve roots and has barrier properties in vitro. J Neurosci Res 2001; 66:439-47. [PMID: 11746361 DOI: 10.1002/jnr.1236] [Citation(s) in RCA: 11] [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: 11/09/2022]
Abstract
Several molecules have been identified as potential sources of the barriers to glial cell mixing and sensory regeneration that exist at the boundary between the peripheral and central nervous systems, including tenascin-C, tenascin-R, chondroitin sulfate proteoglycans, and NG2. Here we show that tenascin-Y, the avian homologue of tenascin-X, is concentrated in the proximal portions of peripheral nerves in the chicken. In vitro analyses of cultures enriched for Schwann cells demonstrate that recombinant tenascin-Y has dose-dependent effects on glial cell attachment, spreading, and migration. In addition, nanomolar concentrations of tenascin-Y cause the rapid collapse of sensory growth cones cultured on fibronectin, and regenerating sensory neurites preferentially migrate on fibronectin and avoid tenascin-Y in microstripe assays. We conclude that the expression pattern of tenascin-Y and its properties in vitro are consistent with a role as an inhibitor of glial cell migration and sensory regeneration in nerve roots.
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Affiliation(s)
- R P Tucker
- Department of Cell Biology and Human Anatomy, University of California, Davis, California 95616, USA.
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35
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Calvo BM, Colombo AL, Fischman O, Santiago A, Thompson L, Lazera M, Telles F, Fukushima K, Nishimura K, Tanaka R, Myiajy M, Moretti-Branchini ML. Antifungal susceptibilities, varieties, and electrophoretic karyotypes of clinical isolates of Cryptococcus neoformans from Brazil, Chile, and Venezuela. J Clin Microbiol 2001; 39:2348-50. [PMID: 11376089 PMCID: PMC88143 DOI: 10.1128/jcm.39.6.2348-2350.2001] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
One hundred clinical isolates of Cryptococcus neoformans from human immunodeficiency virus (HIV)-infected and non-HIV-infected patients from Brazil, Chile, and Venezuela were separated according to varieties and tested for antifungal susceptibility. A high susceptibility to antifungal agents was observed among all the isolates. The electrophoretic karyotyping of 51 strains revealed good discrimination among Cryptococcus neoformans var. neoformans strains.
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Affiliation(s)
- B M Calvo
- Universidad del Zulia-Luz, Maracaibo, Venezuela
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36
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Gómez-Duarte OG, Pasetti MF, Santiago A, Sztein MB, Hoffman SL, Levine MM. Expression, extracellular secretion, and immunogenicity of the Plasmodium falciparum sporozoite surface protein 2 in Salmonella vaccine strains. Infect Immun 2001; 69:1192-8. [PMID: 11160021 PMCID: PMC98005 DOI: 10.1128/iai.69.2.1192-1198.2001] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Deleting transmembrane alpha-helix motifs from Plasmodium falciparum sporozoite surface protein (SSP-2) allowed its secretion from Salmonella enterica serovar Typhimurium SL3261 and S. enterica serovar Typhi CVD 908-htrA by the Hly type I secretion system. In mice immunized intranasally, serovar Typhimurium constructs secreting SSP-2 stimulated greater gamma interferon splenocyte responses than did nonsecreting constructs (P = 0.04).
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Affiliation(s)
- O G Gómez-Duarte
- Center for Vaccine Development, Department of Medicine, School of Medicine, University of Maryland, Baltimore, Maryland 21201, USA
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37
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Liao F, Li Y, O'Connor W, Zanetta L, Bassi R, Santiago A, Overholser J, Hooper A, Mignatti P, Dejana E, Hicklin DJ, Bohlen P. Monoclonal antibody to vascular endothelial-cadherin is a potent inhibitor of angiogenesis, tumor growth, and metastasis. Cancer Res 2000; 60:6805-10. [PMID: 11156369] [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: 02/18/2023]
Abstract
Vascular endothelial-cadherin (VE-cad) is an endothelial cell-specific adhesion molecule that is crucial for proper assembly of vascular tubes. Here we show that a monoclonal antibody (BV13) directed to the extracellular region of VE-cad inhibits formation of adherens junctions and capillary-like structures by endothelial cells and blocks angiogenesis in the mouse cornea and in Matrigel plugs in vivo. Systemic administration of BV13 markedly decreases the growth of s.c. Lewis lung or human A431 epidermoid tumors and strongly suppresses the growth of Lewis lung metastases. These data demonstrate that VE-cad is essential for postnatal angiogenesis and thus validate VE-cad as a novel target for antiangiogenesis agents.
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Affiliation(s)
- F Liao
- Department of Immunology, ImClone Systems Incorporated, New York, New York 10014, USA
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38
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Field PR, Mitchell JL, Santiago A, Dickeson DJ, Chan SW, Ho DW, Murphy AM, Cuzzubbo AJ, Devine PL. Comparison of a commercial enzyme-linked immunosorbent assay with immunofluorescence and complement fixation tests for detection of Coxiella burnetii (Q fever) immunoglobulin M. J Clin Microbiol 2000; 38:1645-7. [PMID: 10747159 PMCID: PMC86512 DOI: 10.1128/jcm.38.4.1645-1647.2000] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A commercially available enzyme-linked immunosorbent assay (ELISA) for the diagnosis of Q fever (PanBio Coxiella burnetii immunoglobulin M [IgM] ELISA, QFM-200) was compared to the indirect fluorescent antibody test (IFAT) for C. burnetii IgM and the complement fixation test (CFT). The ELISA demonstrated 92% agreement with the reference method (IFAT), and gave a sensitivity of 99% (69 of 70 samples) and a specificity of 88% (106 of 121). Specificity can be increased with confirmation by IFAT. CFT was found to have a specificity of 90% (107 of 119), although it was lacking in sensitivity (73%; 51 of 70). No cross-reactivity was observed in the ELISA with serum samples from patients with mycoplasma (n = 6), chlamydia (n = 5), or legionella (n = 4) infections, although 2 of 5 patients with leptospirosis and 1 of 4 samples containing rheumatoid factor (RF) demonstrated positive results in the ELISA. Results indicate that the performance of the PanBio C. burnetii (Q fever) IgM ELISA (F = 187) is superior to that of CFT (F = 163), and consequently the ELISA should be a useful aid in the diagnosis of acute Q fever.
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Affiliation(s)
- P R Field
- Centre for Infectious Diseases and Microbiology Laboratory Services, Institute of Clinical Pathology and Medical Research, Westmead, Australia
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39
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Dasheiff RM, Bjork R, Cooper JL, Dick MT, Glaze D, Haffar AY, Johnson L, Kerasidis H, Luzecky MH, Murthy K, Santiago A, Stergis G, Thompson JM. Specialty care for patients with epilepsy must become standard of care. Promotion of Specialty Care for Epilepsy Group. Seizure 1999; 8:439-40. [PMID: 10628963 DOI: 10.1053/seiz.1999.0350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Epilepsy is a complex, common disorder with severe consequences for patients. The authors believe that a significant percentage of patients are receiving suboptimal care. The national standard of care needs to be upgraded to include the notion that patients with less than total seizure control or those suffering from any medication side-effects should be given the opportunity to receive specialty care by physicians with specific expertise in the field of epilepsy.
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40
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Maciak BJ, Guzman R, Santiago A, Villalobos G, Israel BA. Establishing LA VIDA: a community-based partnership to prevent intimate violence against Latina women. Health Educ Behav 1999; 26:821-40. [PMID: 10608573 DOI: 10.1177/109019819902600606] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
LA VIDA--the Southwest Detroit Partnership to Prevent Intimate Violence Against Latina Women--evolved in response to community concern about the problem of intimate partner violence (IPV) and the lack of culturally competent preventive and support services for Latino women and men in southwest Detroit. Since 1997, diverse organizations have mobilized as a community-academic partnership to ensure the availability, accessibility, and utilization of IPV services. This article describes and analyzes the evolution of LA VIDA within a community-based participatory research framework using a case study approach that draws on multiple data sources including group and individual interviews and field notes. The challenges and lessons learned in addressing a complex multifaceted problem such as IPV in an ethnic minority community are highlighted in an examination of the process of mobilizing diverse organizations, conducting community diagnosis and needs assessment activities, establishing goals and objectives within a social ecological framework, and integrating evaluation during the development phase.
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Affiliation(s)
- B J Maciak
- Urban Research Centers, Centers for Disease Control and Prevention, School of Public Health, University of Michigan, Ann Arbor 48109-2029, USA.
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41
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Prewett M, Huber J, Li Y, Santiago A, O'Connor W, King K, Overholser J, Hooper A, Pytowski B, Witte L, Bohlen P, Hicklin DJ. Antivascular endothelial growth factor receptor (fetal liver kinase 1) monoclonal antibody inhibits tumor angiogenesis and growth of several mouse and human tumors. Cancer Res 1999; 59:5209-18. [PMID: 10537299] [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: 02/14/2023]
Abstract
Tumor angiogenesis is mediated by tumor-secreted angiogenic growth factors that interact with their surface receptors expressed on endothelial cells. Vascular endothelial growth factor (VEGF) and its receptor [fetal liver kinase 1 (Flk-1)/kinase insert domain-containing receptor] play an important role in vascular permeability and tumor angiogenesis. Previously, we reported on the development of anti-Flk-1 and antikinase insert domain-containing receptor monoclonal antibodies (mAbs) that potently inhibit VEGF binding and receptor signaling. Here, we report the effect of anti-Flk-1 mAb (DC101) on angiogenesis and tumor growth. Angiogenesis in vivo was examined using a growth factor supplemented (basic fibroblast growth factor + VEGF) Matrigel plug and an alginate-encapsulated tumor cell (Lewis lung) assay in C57BL/6 mice. Systemic administration of DC101 every 3 days markedly reduced neovascularization of Matrigel plugs and tumor-containing alginate beads in a dose-dependent fashion. Histological analysis of Matrigel plugs showed reduced numbers of endothelial cells and vessel structures. Several mouse tumors and human tumor xenografts in athymic mice were used to examine the effect of anti-Flk-1 mAb treatment on tumor angiogenesis and growth. Anti-Flk-1 mAb treatment significantly suppressed the growth of primary murine Lewis lung, 4T1 mammary, and B16 melanoma tumors and growth of Lewis lung metastases. DC101 also completely inhibited the growth of established epidermoid, glioblastoma, pancreatic, and renal human tumor xenografts. Histological examination of anti-Flk-1 mAb-treated tumors showed evidence of decreased microvessel density, tumor cell apoptosis, decreased tumor cell proliferation, and extensive tumor necrosis. These findings support the conclusion that anti-Flk-1 mAb treatment inhibits tumor growth by suppression of tumor-induced neovascularization and demonstrate the potential for therapeutic application of anti-VEGF receptor antibody in the treatment of angiogenesis-dependent tumors.
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MESH Headings
- Animals
- Antibodies, Monoclonal/therapeutic use
- Apoptosis
- Female
- Humans
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Nude
- Necrosis
- Neoplasm Transplantation
- Neoplasms, Experimental/blood supply
- Neoplasms, Experimental/pathology
- Neoplasms, Experimental/therapy
- Neovascularization, Pathologic/prevention & control
- Receptor Protein-Tyrosine Kinases/antagonists & inhibitors
- Receptors, Growth Factor/antagonists & inhibitors
- Receptors, Vascular Endothelial Growth Factor
- Transplantation, Heterologous
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Affiliation(s)
- M Prewett
- Department of Immunology, ImClone Systems Inc., New York, New York 10014, USA
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42
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Zhu Z, Lu D, Kotanides H, Santiago A, Jimenez X, Simcox T, Hicklin DJ, Bohlen P, Witte L. Inhibition of vascular endothelial growth factor induced mitogenesis of human endothelial cells by a chimeric anti-kinase insert domain-containing receptor antibody. Cancer Lett 1999; 136:203-13. [PMID: 10355750 DOI: 10.1016/s0304-3835(98)00324-3] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The kinase insert domain-containing receptor (KDR) is the human vascular endothelial growth factor (VEGF) receptor responsible for the mitogenic and angiogenic effects of VEGF. There is much experimental evidence to suggest that the VEGF/KDR pathway plays an important role in tumor angiogenesis, a process essential for tumor growth and metastasis. Here we produced a chimeric anti-KDR antibody (IgG1), c-p1C11, from a single chain (scFv) antibody isolated from a phage display library. C-p1C11 binds specifically to the extracellular domain of soluble as well as cell-surface expressed KDR. It effectively blocks VEGF-KDR interaction and inhibits VEGF-stimulated activation of KDR and MAP kinases p44/p42 of human endothelial cells. Furthermore, c-p1C11 efficiently neutralizes VEGF-induced mitogenesis of human endothelial cells. Our results suggest that antibodies against KDR have potential clinical applications in the treatment of cancer and other diseases where pathological angiogenesis is involved.
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Affiliation(s)
- Z Zhu
- Department of Molecular and Cell Biology, ImClone Systems Inc., New York, NY 10014, USA.
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43
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González CR, Noriega FR, Huerta S, Santiago A, Vega M, Paniagua J, Ortiz-Navarrete V, Isibasi A, Levine MM. Immunogenicity of a Salmonella typhi CVD 908 candidate vaccine strain expressing the major surface protein gp63 of Leishmania mexicana mexicana. Vaccine 1998; 16:1043-52. [PMID: 9682357 DOI: 10.1016/s0264-410x(97)00267-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [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: 11/29/2022]
Abstract
Attenuated Salmonella typhi are attractive for use as live vector vaccines to express protozoal antigens and deliver them to the human immune system. The gene encoding the mature form of Leishmania mexicana mexicana gp63 under control of tac promoter was integrated into the delta aroC locus of the chromosome of attenuated delta aroC, delta aroD S. typhi strain CVD 908. After oral immunization of BALB/c mice with two 1 x 10(9) colony forming unit doses given 21 days apart, CVD 908 omega (delta aroC::Ptac-gp63) elicited a broad T cell-mediated immune response against L. m. mexicana gp63 as demonstrated by: (1) lymphoproliferative response to fixed whole L. m. mexicana promastigotes; (2) activation of IL-2 (but not IL-4)-producing lymphocytes; (3) appearance of cytotoxic T cells against mouse mastocytoma cells expressing gp63. This T-cell mediated immune response was associated with significant protection in F1 (BALB/cXC57Bl/6) mice challenged in their footpads with a wild type strain of L. m. mexicana.
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MESH Headings
- Administration, Oral
- Animals
- Antigens, Protozoan/genetics
- Base Sequence
- Cytotoxicity, Immunologic
- DNA Primers/genetics
- Genes, Protozoan
- Genetic Vectors
- Humans
- In Vitro Techniques
- Interleukin-2/biosynthesis
- Leishmania mexicana/genetics
- Leishmania mexicana/immunology
- Leishmaniasis, Cutaneous/immunology
- Leishmaniasis, Cutaneous/prevention & control
- Lymphocyte Activation
- Metalloendopeptidases/genetics
- Metalloendopeptidases/immunology
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Protozoan Proteins/genetics
- Protozoan Proteins/immunology
- Protozoan Vaccines/administration & dosage
- Protozoan Vaccines/genetics
- Protozoan Vaccines/immunology
- Recombinant Proteins/genetics
- Recombinant Proteins/immunology
- Salmonella typhi/genetics
- Salmonella typhi/immunology
- T-Lymphocytes/immunology
- Vaccines, Synthetic/administration & dosage
- Vaccines, Synthetic/genetics
- Vaccines, Synthetic/immunology
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Affiliation(s)
- C R González
- Unidad de Investigación Médica en Inmunoquímica, México, D.F., México
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44
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Montesino M, Santiago A, Millán JA, Jiménez J, Grasa V, Sebastián JL, Cía T. [Five years experience in the treatment of urinary lithiasis with the extracorporal lithotriptor MFL-5000]. An Sist Sanit Navar 1998; 21:149-53. [PMID: 12891403 DOI: 10.23938/assn.0661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We present a review of the treatments of the urinary calculations carried out in the Lithotrity Unit in its first five years of working with the Dornier lithotriptor MFL-5000. We describe the location and size of the calculations, distribution by age and sex of the patients, energy applied and time employed, and we compare our retreatment index and the number of sessions per calculation with those published by other authors.
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Affiliation(s)
- M Montesino
- Servicio de Urología, Hospital Virgen del Camino, C/ Irunlarrea, 4, 31008 Pamplona
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45
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Watson MH, Bourne Y, Arvai AS, Hickey MJ, Santiago A, Bernstein SL, Tainer JA, Reed SI. A mutation in the human cyclin-dependent kinase interacting protein, CksHs2, interferes with cyclin-dependent kinase binding and biological function, but preserves protein structure and assembly. J Mol Biol 1996; 261:646-57. [PMID: 8800213 DOI: 10.1006/jmbi.1996.0490] [Citation(s) in RCA: 13] [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: 02/02/2023]
Abstract
A mutation directing an amino acid substitution in the conserved beta-hinge region of one of the human Cks isoforms, CksHs2, was constructed by site-directed mutagenesis. Replacement of glutamine for glutamate 63 (E63Q) was predicted to stabilize the beta-interchanged dimeric and hexameric assembly of CksHs2. However, such an effect was seen only at high, non-physiological pH. Three-dimensional structures of the E63Q hexameric mutant protein were determined to 2.6 A resolution in a P4(3)2(1)2 space group and 2.1 A in the C2 space group isostructural with wild-type, and both were shown to be virtually identical to the refined 1.7 A wild-type structure. Thus, the E63Q mutation did not alter the wild-type structure and assembly of CksHs2 but, surprisingly, disrupted the essential biological function of the protein and significantly reduced its ability to bind to cyclin-dependent kinases. The Kd of wild-type CksHs2 for CDK2 was 5.05 x 10(-8) M, whereas the affinity of the mutant protein for CDK2 was too low to allow a determination. These data, coupled with the observation that monomeric but not hexameric CksHs2 interacts with cyclin-dependent kinases, suggest that glutamine 63 is likely to be directly involved in cyclin-dependent kinase binding in vitro and in vivo.
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Affiliation(s)
- M H Watson
- Department of Molecular Biology, Scripps Research Institute, La Jolla, CA 92037, USA
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46
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Abstract
PURPOSE This article describes a technique of salivary gland endoscopy using a 2.1-mm endoscope with a 1-mm working channel. The technique allows intracorporeal lithotripsy under endoscopic control. Two types of energy to produce calculi fragmentation were analyzed. PATIENTS AND METHODS Of 39 patients who presented with obstructive sialoadenitis, endoscopic treatment was possible in 27. Eighteen had a diagnosis of sialolithiasis. Intracorporeal lithotripsy was done under endoscopic control in these patients. Laser energy was used to produce fragmentation in 3 cases and pneumobalistic energy in 9. In 6 cases, the calculi were extracted with forceps. RESULTS Fifteen patients are free of stones and symptoms after a 6-month follow-up. Fragmentation and extraction of the calculi were not possible in 3 patients. Two of these patients required open surgery. The other patient is under observation. CONCLUSIONS The use of endoscopes with a working channel allows irrigation to improve visibility during exploration. Both extraction of calculi and lithiasis fragmentation using different energies can be carried out through the channel. In this series, pneumoballistic energy (Lithoclast) has been shown to produce calculus fragmentation with more efficiency than lasertripsy (Dornier Impact). When dilation and placement of a cannula (Abocath 16 G) was done 2 days preoperatively, endoscopy was performed more easily. Postoperative drainage has proven effective in avoiding complications.
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Affiliation(s)
- E Arzoz
- Hospital Virgen del Camino, Pamplona, Spain
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47
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Affiliation(s)
- E Arzoz
- Unidad de Litotricia del Hospital Virgen del Camino, Pamplona, Spain
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48
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Santiago A, Carbajal ME, Benítez-King G, Meza I. Entamoeba histolytica: PKC transduction pathway activation in the trophozoite-fibronectin interaction. Exp Parasitol 1994; 79:436-44. [PMID: 7957762 DOI: 10.1006/expr.1994.1105] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [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: 01/28/2023]
Abstract
Interaction of Entamoeba histolytica trophozoites with fibronectin (FN) induces reorganization of the actin cytoskeleton and an increase in proteolytic activities that results in the degradation of the bound protein. The binding is mediated by a 37-kDa FN "receptor" localized in the trophozoite surface and associated to the cytoskeleton. The intracellular signals triggered by the ligand-receptor interaction are not well understood but it is plausible that they drive the observed responses. To address this issue, the activation of protein kinase C (PKC) pathways by FN binding was explored. Stimulation with phorbol myristate acetate (PMA) or FN produced a rapid increase in the amebas adhesion to the substrate and local release of proteases. Two PKC inhibitors, H7 and staurosporine, reverted the PMA stimulus and inhibited the response induced by FN. Interaction with FN as well as treatment with PMA produced transient changes of F-actin levels susceptible to inhibition by H7. Furthermore, phosphorylation of amebic proteins was enhanced in response to FN binding and PMA, while the presence of the PKC inhibitor diminished their phosphorylation. Inositol triphosphate production was stimulated by the FN binding, and PKC activation and translation was registered in cell extracts obtained from the stimulated amebas. Our results suggest that PKC pathways are activated in amebas by information transduced as a result of trophozoite binding to FN.
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Affiliation(s)
- A Santiago
- Departamento de Biología Celular, Centro de Investigación y de Estudios Avanzados del I.P.N. Apartado, México, D.F., Mexico
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Hora K, Satriano JA, Santiago A, Mori T, Stanley ER, Shan Z, Schlondorff D. Receptors for IgG complexes activate synthesis of monocyte chemoattractant peptide 1 and colony-stimulating factor 1. Proc Natl Acad Sci U S A 1992; 89:1745-9. [PMID: 1542668 PMCID: PMC48529 DOI: 10.1073/pnas.89.5.1745] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.7] [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: 12/27/2022] Open
Abstract
The chemotactic factors responsible for complement-independent macrophage accumulation in immune-complex diseases such as glomerulonephritis remain unknown. Fc receptors for IgG complexes are found on mesangial cells of the kidney, which produce the macrophage growth factor colony-stimulating factor 1 (CSF-1). We therefore investigated the possible stimulation of mesangial-cell expression of CSF-1 and the recently identified monocyte-specific chemoattractant protein 1 (MCP-1) by IgG complexes. IgG complexes, but not monomeric IgG or F(ab')2 fragments of IgG, rapidly (2-8 h) increased mRNA for both CSF-1 (10-fold) and MCP-1 (20-fold) in cultured mouse mesangial cells. The increase of mRNA for CSF-1 and MCP-1 was not reduced by either cytochalasin B or D, indicating that Fc receptor occupancy is sufficient for signaling and that phagocytosis is not required to elicit this response. IgG complexes also caused a 10-fold increase in the secretion of CSF-1 and a 3- to 5-fold increase in secretion of MCP-1 into the cell culture medium. The synthesis and release of CSF-1 and MCP-1 by mesangial cells as a consequence of Fc receptor occupancy may be responsible for macrophage recruitment and activation at sites of immune-complex deposition.
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Affiliation(s)
- K Hora
- Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10461
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50
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Castillo JM, Illarramendi JJ, Santiago A, Sebastián JL. Low dose epirubicin for hypercalcemia associated with renal pelvis carcinoma. ARCH ESP UROL 1991; 44:97-9. [PMID: 1712187] [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: 12/28/2022]
Abstract
We present a case of hypercalcemia associated with a renal pelvis squamous neoplasm. Severe hyperleukocytosis was also present, resembling a leukaemoid reaction. After failure of standard therapy, we performed a trial of low dose epirubicin in this patient, obtaining a short-term clinical remission. Although a palliative non-toxic effect seems to be achievable with this approach, further studies are needed to ascertain the role of chemotherapy in the long-term control of this condition.
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Affiliation(s)
- J M Castillo
- Department of Urology, Hospital Virgen del Camino, Pamplona, Spain
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