1
|
Fonseca EV, Olaya N, Patifto EF, Aponte NH, Linares Ballesteros A. [Identification of epithelial-mesenchymal transition markers (EMT) by immunohistochemistry in pediatric osteosarcoma and association with clinical outcomes]. Andes Pediatr 2022; 93:868-877. [PMID: 37906804 DOI: 10.32641/andespediatr.v93i6.4255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 06/04/2022] [Indexed: 11/02/2023]
Abstract
The epithelial-mesenchymal transition (EMT) is the ability of epithelial and mesenchymal cells to exchange phenotypes transiently. Its identification in carcinomatous cells has been associated with aggressive clinical phenotypes. In sarcomas, this ability is under study. OBJECTIVE to evaluate the expression of two transcription factors involved in EMT by immunohistochemistry in pediatric osteosarcoma and its association with clinical outcomes. PATIENTS AND METHOD A retrospective cohort study in children under 18 years of age with osteosarcoma diagnosis. Immunohistochemistry was performed for Snail and Twist-1 expressions from samples collected at the time of diagnosis. Correlations between immunohistochemistry and the clinical outcomes and overall survival were performed. RESULTS 53 patients were included. There were 26 positive cytoplasmic cases (49.1%) in Snail expression and were correlated with the presence of multiple metastases (p = 0.02) and distant bone metastases (p = 0.01). On the other hand, 45 cases (84.9%) were positive in Twist-1 expression in the nuclear location, showing no association with the analyzed clinical variables. CONCLUSIONS Snail and Twist-1 were frequently expressed in pediatric cases of osteosarcoma. Cytoplasmic Snail was correlated with the presence of multiple metastatic disease and distant bone metastases. The positivity of both markers suggests the activation of these proteins as regulators of EMT events in this tumor, suggesting a role in the phenomena related to the clinical presentation of the disease.
Collapse
|
2
|
Olaya N, Bravo-Luna L. Angiosarcoma óseo en el húmero de un paciente pediátrico, un reto diagnóstico:. Iatreia 2022. [DOI: 10.17533/udea.iatreia.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
El angiosarcoma óseo es una neoplasia maligna rara, agresiva y de mal pronóstico, que es inusual en niños. Esta entidad afecta preferentemente a los huesos tubulares y se puede presentar como lesión solitaria o multicéntrica. Presentamos el caso de una niña de 7 años, sin antecedentes médico quirúrgicos, quien consultó al Instituto Nacional de Cancerología - Colombia, por presentar una lesión tumoral que comprometía la totalidad del húmero, destruyéndolo y deformando el brazo. Para orientar el diagnóstico de la lesión, se realizó un estudio histopatológico minucioso y marcadores de inmunohistoquímica, estos sugirieren una neoplasia vascular maligna. Por el extenso compromiso tumoral, la única opción terapéutica, fue la desarticulación escapulotorácica de la extremidad, seguida de manejo adyuvante con protocolo de quimioterapia. Durante los ciclos de quimioterapia, la paciente presentó lesiones metastásicas en pulmón, que fueron resecadas. En el momento, se encuentra sin lesiones tumorales y en seguimiento estricto.
Collapse
|
3
|
Castro P, Patiño E, Fierro F, Rojas C, Buitrago G, Olaya N. Clinical characteristics, surgical approach, BRAFV600E mutation and sodium iodine symporter expression in pediatric patients with thyroid carcinoma. J Pediatr Endocrinol Metab 2020; 33:1457-1463. [PMID: 33031052 DOI: 10.1515/jpem-2020-0201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 08/28/2020] [Indexed: 11/15/2022]
Abstract
Objectives Thyroid cancer is the most common endocrine neoplasm in childhood. There are few studies characterizing pediatric population in Colombia. We intend to detail the clinical, histological characteristics, BRAFV600E mutational status and NIS (sodium-iodine symporter) expression of children with papillary thyroid carcinoma (PTC) managed at Hospital de La Misericordia. Methods Medical records of the Department of Pediatric Surgery and Pathology from 2009 to 2018 were scrutinized in search of cases of differentiated thyroid carcinoma. A descriptive analysis was made. Paraffin embedded tumoral tissue was recovered to assess BRAF V600E mutational status by PCR and NIS expression by immunohistochemistry. Results Sixteen patients were selected, 81.2% were girls. Average age of presentation was 11.8 years. Only one patient had previous radiation exposure. Most frequent symptom was cervical adenopathy with a mean time of 29.2 weeks before diagnosis. 93.7% underwent total thyroidectomy and lymphadenectomy. 62.5% were PTC combining both classic and follicular pattern. 6.25% cases had BRAFV600E mutation and 25% showed NIS focal reactivity. Conclusions We found greater female predominance, lower percentage of risk factors described and a high percentage of patients requiring aggressive surgical treatment. We consider important to contemplate thyroid cancer as a differential diagnosis of cervical lymph node enlargement in children. Diagnosis can be challenging in benign and indeterminate categories of the FNA cytology and biomolecular profiles such as BRAF and NIS could be determinant in guiding treatment. More studies with larger sample size, complete genetic analysis, evaluation to iodine response and long term follow up are required.
Collapse
Affiliation(s)
- Paula Castro
- Pediatric Surgery Resident, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Esteban Patiño
- Pathologist Fundación Hospital, Pediátrico La Misericordia, Bogotá, Colombia
| | - Fernando Fierro
- Pediatric Surgeon Fundación Hospital, Pediátrico La Misericordia, Department of Surgery, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Carolina Rojas
- Pediatric endocrinologist Fundación Hospital, Pediátrico La Misericordia, Bogotá, Colombia
| | - Giancarlo Buitrago
- Department of Surgery - Clinical Research Institute, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Natalia Olaya
- Pathologist Fundación Hospital Pediátrico La Misericordia, Department of Pathology, Universidad Nacional de Colombia, Bogotá, Colombia
| |
Collapse
|
4
|
Cano C, Pérez L, Támara J, Olaya N. Gamna-Gandy bodies in pediatric thyroid nodular hyperplasia. Human Pathology: Case Reports 2020. [DOI: 10.1016/j.ehpc.2020.200357] [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: 10/24/2022] Open
|
5
|
Peng C, Kaščáková S, Chiappini F, Olaya N, Sandt C, Yousef I, Samuel D, Dumas P, Guettier C, Le Naour F. Discrimination of cirrhotic nodules, dysplastic lesions and hepatocellular carcinoma by their vibrational signature. J Transl Med 2016; 14:9. [PMID: 26754490 PMCID: PMC4710034 DOI: 10.1186/s12967-016-0763-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 01/02/2016] [Indexed: 01/14/2023] Open
Abstract
Background Hepatocarcinogenesis is a multistep process characterized in patients with chronic liver diseases by a spectrum of hepatic nodules that mark the progression from regenerative nodules to dysplastic lesions followed by hepatocellular carcinoma (HCC). The differential diagnosis between precancerous dysplastic nodules and early HCC still represents a challenge for both radiologists and pathologists. We addressed the potential of Fourier transform-infrared (FTIR) microspectroscopy for grading cirrhotic nodules on frozen tissue sections. Methods The study was focused on 39 surgical specimens including normal livers (n = 11), dysplastic nodules (n = 6), early HCC (n = 1), progressed HCC on alcoholic cirrhosis (n = 10) or hepatitis C virus cirrhosis (n = 11). The use of the bright infrared source emitted by the synchrotron radiation allowed investigating the biochemical composition at the cellular level. Chemical mapping on whole tissue sections was further performed using a FTIR microscope equipped with a laboratory-based infrared source. The variance was addressed by principal component analysis. Results Profound alterations of the biochemical composition of the pathological liver were demonstrated by FTIR microspectroscopy. Indeed, dramatic changes were observed in lipids, proteins and sugars highlighting the metabolic reprogramming in carcinogenesis. Quantifiable spectral markers were characterized by calculating ratios of areas under specific bands along the infrared spectrum. These markers allowed the discrimination of cirrhotic nodules, dysplastic lesions and HCC. Finally, the spectral markers can be measured using a laboratory FTIR microscope that may be easily implemented at the hospital. Conclusion Metabolic reprogramming in liver carcinogenesis can constitute a signature easily detectable using FTIR microspectroscopy for the diagnosis of precancerous and cancerous lesions. Electronic supplementary material The online version of this article (doi:10.1186/s12967-016-0763-6) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Chengyuan Peng
- Inserm, Unité 1193, 94800, Villejuif, France. .,Univ Paris-Sud, UMR-S1193, 94800, Villejuif, France.
| | - Slávka Kaščáková
- Inserm, Unité 1193, 94800, Villejuif, France. .,Univ Paris-Sud, UMR-S1193, 94800, Villejuif, France.
| | - Franck Chiappini
- Inserm, Unité 1193, 94800, Villejuif, France. .,Univ Paris-Sud, UMR-S1193, 94800, Villejuif, France.
| | - Natalia Olaya
- Instituto Nacional de Cancerologia, Bogota, Colombia.
| | | | | | - Didier Samuel
- Inserm, Unité 1193, 94800, Villejuif, France. .,Univ Paris-Sud, UMR-S1193, 94800, Villejuif, France. .,Centre Hépato-Biliaire, AP-HP Hôpital Paul Brousse, 94800, Villejuif, France.
| | - Paul Dumas
- SOLEIL Synchrotron, 91192, Gif sur Yvette, France.
| | - Catherine Guettier
- Inserm, Unité 1193, 94800, Villejuif, France. .,Univ Paris-Sud, UMR-S1193, 94800, Villejuif, France. .,Service d'Anatomopathologie, AP-HP Hôpital Bicêtre, 94275, Le Kremlin-Bicêtre, France.
| | - François Le Naour
- Inserm, Unité 1193, 94800, Villejuif, France. .,Univ Paris-Sud, UMR-S1193, 94800, Villejuif, France.
| |
Collapse
|
6
|
|
7
|
Villamizar-Rivera N, Olaya N. [Clonality lymphoid study through rearrangement analysis of antigen receptor]. Rev Med Inst Mex Seguro Soc 2015; 53:56-65. [PMID: 25680644] [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] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
As a rule, malignant lymphoid proliferations are clonal. While most of the time the biological potential can be established through routine pathologic examination and auxiliary techniques, some cases are difficult to classify. Moreover, there are situations in which there are dominant clones whose analysis are important, such as occur in autoimmune diseases and immunodeficiency. This paper presents in an understandable way the main techniques for the study of clonality in lymphoid lesions, i.e. the analysis of rearrangements of antigen receptor genes by multiplex polymerase chain reaction (PCR) based tests.
Collapse
|
8
|
Bedoya AM, Jaramillo R, Baena A, Castaño J, Olaya N, Zea AH, Herrero R, Sanchez GI. Location and Density of Immune Cells in Precursor Lesions and Cervical Cancer. Cancer Microenviron 2012; 6:69-77. [PMID: 22290207 DOI: 10.1007/s12307-012-0097-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Accepted: 01/11/2012] [Indexed: 12/21/2022]
Abstract
Only a small proportion of women infected with Human Papillomavirus (HPV) develop cervical cancer. Host immune response seems to play a role eliminating the viral infection and preventing progression to cancer. Characterization of tumor infiltrating lymphocytes (TILs) in cervical pre-neoplastic lesions and cervical cancer may be helpful to understand the mechanisms that mediate this protection. The aim of this study was to determine if there are differences in the localization and density (cells/mm(2)) of CD8+ T-cells, CD4+ T-cells and Tregs (CD25 + Foxp3+) in cervical pre-neoplastic lesions and cervical cancer. Immunohistochemical analysis of sections of 96 (26 CIN1, 21 CIN2, 25 CIN3, and 24 SCC) samples revealed that regardless of CIN grades, CD8+ T-cells are more abundant than CD4+, CD25+ and Foxp3+ cells in both the stroma and epithelium. There was a higher density of CD8+ cells in the stroma of cervical cancer compared to CIN3 (OR = 4.20, 95% CI 1.2-15), CIN2 (OR = 7.86, 95% CI 1.7-36.4) and CIN1 (OR = 4.25, 95% CI 1.1-17). Studies evaluating whether these cells are recruited before or after cancer progression will be helpful to understand the role of these cells in the natural history of HPV-induced lesions.
Collapse
Affiliation(s)
- Astrid M Bedoya
- Grupo Infección y Cáncer, Facultad de Medicina, Universidad de Antioquia, Cra 51D No. 62-29 Lab 283, Medellin, Colombia
- Escuela de Microbiología, Universidad de Antioquia, Medellin, Colombia
| | | | - Armando Baena
- Grupo Infección y Cáncer, Facultad de Medicina, Universidad de Antioquia, Cra 51D No. 62-29 Lab 283, Medellin, Colombia
- Escuela de Microbiología, Universidad de Antioquia, Medellin, Colombia
| | - Jorge Castaño
- Departamento de Patología, Facultad de Medicina, Universidad de Antioquia and Hospital Universitario San Vicente de Paúl, Medellin, Colombia
| | - Natalia Olaya
- Departamento de Patología, Facultad de Medicina, Universidad de Antioquia and Hospital Universitario San Vicente de Paúl, Medellin, Colombia
| | - Arnold H Zea
- Department of Microbiology, Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Rolando Herrero
- Prevention and Implementation Group, International Agency for Research on Cancer, Lyon, France
| | - Gloria I Sanchez
- Grupo Infección y Cáncer, Facultad de Medicina, Universidad de Antioquia, Cra 51D No. 62-29 Lab 283, Medellin, Colombia.
| |
Collapse
|
9
|
Moncada-Vélez M, Vélez-Ortega A, Orrego J, Santisteban I, Jagadeesh J, Olivares M, Olaya N, Hershfield M, Candotti F, Franco J. Somatic mosaicism caused by monoallelic reversion of a mutation in T cells of a patient with ADA-SCID and the effects of enzyme replacement therapy on the revertant phenotype. Scand J Immunol 2011; 74:471-81. [PMID: 21671975 DOI: 10.1111/j.1365-3083.2011.02593.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Patients with adenosine deaminase (ADA) deficiency exhibit spontaneous and partial clinical remission associated with somatic reversion of inherited mutations. We report a child with severe combined immunodeficiency (T-B- SCID) due to ADA deficiency diagnosed at the age of 1 month, whose lymphocyte counts including CD4+ and CD8+ T and NK cells began to improve after several months with normalization of ADA activity in Peripheral blood lymphocytes (PBL), as a result of somatic mosaicism caused by monoallelic reversion of the causative mutation in the ADA gene. He was not eligible for haematopoietic stem cell transplantation (HSCT) or gene therapy (GT); therefore he was placed on enzyme replacement therapy (ERT) with bovine PEG-ADA. The follow-up of metabolic and immunologic responses to ERT included gradual improvement in ADA activity in erythrocytes and transient expansion of most lymphocyte subsets, followed by gradual stabilization of CD4+ and CD8+ T (with naïve phenotype) and NK cells, and sustained expansion of TCRγδ+ T cells. This was accompanied by the disappearance of the revertant T cells as shown by DNA sequencing from PBL. Although the patient's clinical condition improved marginally, he later developed a germinal cell tumour and eventually died at the age of 67 months from sepsis. This case adds to our current knowledge of spontaneous reversion of mutations in ADA deficiency and shows that the effects of the ERT may vary among these patients, suggesting that it could depend on the cell and type in which the somatic mosaicism is established upon reversion.
Collapse
Affiliation(s)
- M Moncada-Vélez
- Department of Biology, University of Antioquia, Medellin, Colombia
| | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Giraldo NA, Bolaños NI, Cuellar A, Guzman F, Uribe AM, Bedoya A, Olaya N, Cucunubá ZM, Roa N, Rosas F, Velasco V, Puerta CJ, González JM. Increased CD4+/CD8+ double-positive T cells in chronic Chagasic patients. PLoS Negl Trop Dis 2011; 5:e1294. [PMID: 21886854 PMCID: PMC3160296 DOI: 10.1371/journal.pntd.0001294] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Accepted: 07/19/2011] [Indexed: 01/08/2023] Open
Abstract
Background CD4+/CD8+ double positive (DP) T cells have been described in healthy individuals as well as in patients with autoimmune and chronic infectious diseases. In chronic viral infections, this cell subset has effector memory phenotype and displays antigen specificity. No previous studies of double positive T cells in parasite infections have been carried out. Methodology/Principal Findings Seventeen chronic chagasic patients (7 asymptomatic and 10 symptomatic) and 24 non-infected donors, including 12 healthy and 12 with non-chagasic cardiomyopathy donors were analyzed. Peripheral blood was stained for CD3, CD4, CD8, HLA-DR and CD38, and lymphocytes for intracellular perforin. Antigen specificity was assessed using HLA*A2 tetramers loaded with T. cruzi K1 or influenza virus epitopes. Surface expression of CD107 and intracellular IFN-γ production were determined in K1-specific DP T cells from 11 chagasic donors. Heart tissue from a chronic chagasic patient was stained for both CD8 and CD4 by immunochemistry. Chagasic patients showed higher frequencies of DP T cells (2.1%±0.9) compared with healthy (1.1%±0.5) and non-chagasic cardiomyopathy (1.2%±0.4) donors. DP T cells from Chagasic patients also expressed more HLA-DR, CD38 and perforin and had higher frequencies of T. cruzi K1-specific cells. IFN-γ production in K1-specific cells was higher in asymptomatic patients after polyclonal stimulation, while these cells tended to degranulate more in symptomatic donors. Immunochemistry revealed that double positive T cells infiltrate the cardiac tissue of a chagasic donor. Conclusions Chagasic patients have higher percentages of circulating double positive T cells expressing activation markers, potential effector molecules and greater class I antigenic specificity against T. cruzi. Although K1 tetramer positive DP T cell produced little IFN-γ, they displayed degranulation activity that was increased in symptomatic patients. Moreover, K1-specific DP T cells can migrate to the heart tissue. Chagas disease, produced by the blood parasite Trypanosoma cruzi, is considered a public health problem in Central and South America. Non sterile immunity can be achieved after acute infection. Parasite persistence can induce tissue damage in nearly 20% to 30% of chronically infected individuals. Indeed, chagasic cardiomyopathy is one of the consequences of the chronic infection. Antigen persistence and dysfunctional cellular immune response have been implicated in T. cruzi pathogenesis. Here, a higher frequency of circulating CD4+/CD8+ double positive T cells in chronic chagasic patients is reported as compared with non infected donors, including those with a non-chagasic cardiomyopathy. This cell subset also expressed more activation markers and stored more intracellular perforin. We have previously reported that CD8+ T cells from T. cruzi infected donors recognized the HLA-A*0201 restricted K1-peptide derived from the KMP-11 protein. Here, double positive T cells displayed higher percentages of recognition for the K1 peptide than single CD8+ T cells. These cells produce little IFN-γ, but display degranulation activity that was increased in the symptomatic group. Finally, double positive T cells can be localized in the heart tissue from a chronic chagasic donor.
Collapse
Affiliation(s)
- Nicolas A. Giraldo
- Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, Colombia
| | - Natalia I. Bolaños
- Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, Colombia
| | - Adriana Cuellar
- Grupo de Inmunobiología y Biología Celular, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Fanny Guzman
- Núcleo Biotecnología Curauma (NBC), Pontificia Universidad Católica de Valparaíso, Valparaiso, Chile
| | - Ana Maria Uribe
- Facultad de Medicina, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Astrid Bedoya
- Grupo de Infección y Cáncer, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
| | - Natalia Olaya
- Instituto de Patología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
| | - Zulma M. Cucunubá
- Grupo de Parasitología, Instituto Nacional de Salud, Bogotá, Colombia
| | - Nubia Roa
- Facultad de Medicina, Pontificia Universidad Javeriana, Bogotá, Colombia
| | | | | | - Concepción J. Puerta
- Laboratorio de Parasitología Molecular, Departamento de Microbiología, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - John M. González
- Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, Colombia
- * E-mail:
| |
Collapse
|
11
|
Abstract
Hamartomas of the spleen or splenomas are uncommon benign lesions that predominantly occur in adults. We report a case of an 11-year-old girl with sickle cell anemia who had a single splenic 1.8 cm nodule incidentally found during splenectomy and histologically characterized by disorganized red pulp tissue without interspersed white pulp leading to the diagnosis of hamartoma. The association of hamartoma and hematological conditions is a very unusual condition in children.
Collapse
Affiliation(s)
- Amal Benkirane
- Anatomie et Cytologie pathologiques, Hôpital Robert Debré, 48, boulevard Sérurier 75019 Paris
| | | | | | | | | | | | | |
Collapse
|
12
|
Barrier A, Olaya N, Chiappini F, Roser F, Scatton O, Artus C, Franc B, Dudoit S, Flahault A, Debuire B, Azoulay D, Lemoine A. Ischemic preconditioning modulates the expression of several genes, leading to the overproduction of IL-1Ra, iNOS, and Bcl-2 in a human model of liver ischemia-reperfusion. FASEB J 2006; 19:1617-26. [PMID: 16195370 DOI: 10.1096/fj.04-3445com] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Ischemia triggers an inflammatory response that precipitates cell death during reperfusion. Several studies have shown that tissues are protected by ischemic preconditioning (IP) consisting of 10 min of ischemia followed by 10 min of reperfusion just before ischemia. The molecular basis of this protective effect is poorly understood. We used cDNA arrays (20K) to compare global gene expression in liver biopsies from living human liver donors who underwent IP (n=7) or not (n=7) just before liver devascularization. Microarray data were analyzed using pairedt test with a type I error rate fixed at alpha = 2.5 10(6) (Bonferroni correction). We found that 60 genes were differentially expressed (36 over- and 24 underexpressed in preconditioning group). After IP, the most significantly overexpressed gene was IL-1Ra. This was confirmed by immunoblotting. Differentially expressed were genes involved in apoptosis (NOD2, ephrin-A1, and calpain) and in the carbohydrate metabolism. A significant increase in the amount of the anti-apoptotic protein Bcl-2 in preconditioned livers but no change in the cleavage of procaspase-3, -8, and -9 was observed. We also observed an increase in the amount in the inducible nitric oxide synthase. Therefore, the benefits of IP may be associated with the overproduction of IL-1Ra, Bcl-2, and NO countering the proinflammatory and proapoptotic effects generated during ischemia-reperfusion.
Collapse
Affiliation(s)
- Alain Barrier
- Inserm 602; Service de Biochimie et Biologie Moléculaire; Hôpital Universitaire Paul Brousse; Université Paris-Sud/XI, Villejuif Cedex; Assistance Publique-Hôpitaux de Paris, France
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|