11
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Daños citogenéticos generados por el uso de metrotrexate para tratamiento de artritis reumatoidea Translated title: Cytogenetic damage generated by the use of methotrexate for the treatment of rheumatoid arthritis

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          RESUMEN Objetivo: Determinar los daños citogenéticos generados por el uso de metrotrexate para tratamiento de artritis reumatoidea. Metodología: Nuestra experiencia en el uso del metotrexate para sincronización celular como retardante del ciclo celular en fase “S” y su posterior inhibición por competencia con la bromodeoxiuridina en la obtención de cromosomas con bandas “R” de replicación, nos indujo a realizar este estudio citogenético utilizando linfocitos de sangre periférica cultivados en medio PB-Max durante 72 horas, provenientes de una paciente de 46 años de edad, con diagnóstico médico de artritis reumatoidea, tratada con metotrexate durante un mes. Resultados: Clínicamente la paciente presentó inflamación de las articulaciones de los dedos de las manos y hombro izquierdo, con impedimento para flexionar el dedo anular de la mano derecha, además de dolor que impide el movimiento de las mismas articulaciones, en ocasiones y debido al dolor no se puede levantar sin ayuda de su lecho. El resultado del análisis citogenético convencional, indicó que de 50 células analizadas, 23 (46%) presentaron cariotipo normal; 17 (34%) muestran aneuploidías de los diferentes grupos cromosómicos del cariotipo humano incluido el (X) y 10 (20%) de polimorfonucleares anormales. Se discute la etiología génica del control molecular del ciclo celular, pensando en que los hallazgos mencionados, estarían más direccionados a los ciclos aberrantes de duplicación del centrosoma y del huso mitótico en general, así como a la alteración parcial de la síntesis del ADN y el ARN, causados probablemente por la acción del metotrexate, lo cual se ve reflejado en que los hallazgos aneuploídicos en el cariotipo son al azar, sin comprometer en particular cromosomas de un grupo determinado. Conclusiones: Se sugiere a los médicos tratantes tener en cuenta alguna directriz en el protocolo terapéutico, relacionada con la cronicidad y el monitoreo citogenético durante el tratamiento con este medicamento.

          Translated abstract

          SUMMARY Objective: To determine the cytogenetic damages generated by the use of methotrexate for the treatment of rheumatoid arthritis. Methods: Our experience in the use of methotrexate for cell synchronization as a retarder of the “S” phase cell cycle and its subsequent inhibition by competition with bromodeoxyuridine in obtaining chromosomes with “R” bands of replication, induced us to perform this cytogenetic study using peripheral blood lymphocytes cultured in PB-Max medium for 72 hours, from a 46-year-old patient, with a medical diagnosis of rheumatoid arthritis, treated with methotrexate for one month. Results: Clinically the patient presented inflammation articulations of left hand fingers and left shoulder, with impediment flex of the annular finger right hand, besides she has pain that prevent the movement of the same articulations, in occasions and because of this problem she cannot get up without help. The conventionally cytogenetic analysis, shows that of the 50 analyzed cells, 23 (46%) presents normal karyotype; 17 (34%) presents aneuploidies of the chromosomic different groups including de (X) chromosome, and 10 (20%) of abnormal polymorphonuclear. We discuss the genetic etiology of the biology cellular control, keep in mind that mentioned findings are preferentially directed due to aberrant cycles of centrosome duplication and mitotic spindle in general, as well as the partial disturbance of the ADN and ARN synthesis, probably caused by methotrexate action, this fact that is reflected in the aneuploidy findings in the karyotype are to random, without compromise of any particular chromosome of the determined group. Conclusions: It is suggested to the treating doctor should really take implement some rule in the therapeutic protocol of corresponding management, relationed with the chronicity and cytogenetic monitoring during the treatment with this medicine.

          Related collections

          Most cited references24

          • Record: found
          • Abstract: found
          • Article: found
          Is Open Access

          Bub1 regulates chromosome segregation in a kinetochore-independent manner

          The kinetochore-bound protein kinase Bub1 performs two crucial functions during mitosis: it is essential for spindle checkpoint signaling and for correct chromosome alignment. Interestingly, Bub1 mutations are found in cancer tissues and cancer cell lines. Using an isogenic RNA interference complementation system in transformed HeLa cells and untransformed RPE1 cells, we investigate the effect of structural Bub1 mutants on chromosome segregation. We demonstrate that Bub1 regulates mitosis through the same mechanisms in both cell lines, suggesting a common regulatory network. Surprisingly, Bub1 can regulate chromosome segregation in a kinetochore-independent manner, albeit at lower efficiency. Its kinase activity is crucial for chromosome alignment but plays only a minor role in spindle checkpoint signaling. We also identify a novel conserved motif within Bub1 (amino acids 458–476) that is essential for spindle checkpoint signaling but does not regulate chromosome alignment, and we show that several cancer-related Bub1 mutants impair chromosome segregation, suggesting a possible link to tumorigenesis.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            The influence of HLA-DRB1 genes on disease severity in rheumatoid arthritis.

            To explore the role of HLA-DRB1 genes in determining disease severity in rheumatoid arthritis. Case series of patients with seropositive rheumatoid arthritis. The outpatient clinic of the Division of Rheumatology, Mayo Clinic. One hundred and two patients with seropositive, erosive rheumatoid arthritis and a minimum disease duration of 3 years. Patients were genotyped for both HLA-DRB1 alleles and were categorized according to the expression of one or two disease-linked HLA-DRB1 alleles. Identification of HLA-DRB1 alleles was done by the polymerase chain reaction and subsequent oligonucleotide hybridization. Homozygosity for allelic variants was confirmed by sequence analysis. Immunogenetically defined patient subgroups were retrospectively evaluated for joint destruction and patterns of disease manifestation, including rheumatoid organ disease. Of 102 patients, 98 (96%) expressed the disease-linked sequence polymorphism. Forty-seven patients (46%) carried a double dose of the relevant sequence stretch: Twenty-eight patients expressed HLA-DRB1*04 variants on both alleles, and 19 combined an HLA-DRB*04 variant with HLA-DRB1*0101 or DRB1*1402. Nodular disease was present in 100% of patients typed as HLA-DRB1*04/04 and in 59% of patients typed as HLA-DRB1*04 and who had inherited only a single dose of the disease-linked sequence polymorphism (P < 0.0001). Major organ systems were involved in 61% and 11% of these two patient groups, respectively (P < 0.0001); and joint surgery was required in 61% and 25% (P < 0.002), respectively. Patients typed as HLA-DR*04/01 had intermediate clinical courses. Genotyping patients with rheumatoid arthritis for both HLA-DRB1 alleles identifies clinical subsets with distinct profiles of disease manifestations.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Spindle formation, chromosome segregation and the spindle checkpoint in mammalian oocytes and susceptibility to meiotic error.

              The spindle assembly checkpoint (SAC) monitors attachment to microtubules and tension on chromosomes in mitosis and meiosis. It represents a surveillance mechanism that halts cells in M-phase in the presence of unattached chromosomes, associated with accumulation of checkpoint components, in particular, Mad2, at the kinetochores. A complex between the anaphase promoting factor/cylosome (APC/C), its accessory protein Cdc20 and proteins of the SAC renders APC/C inactive, usually until all chromosomes are properly assembled at the spindle equator (chromosome congression) and under tension from spindle fibres. Upon release from the SAC the APC/C can target proteins like cyclin B and securin for degradation by the proteasome. Securin degradation causes activation of separase proteolytic enzyme, and in mitosis cleavage of cohesin proteins at the centromeres and arms of sister chromatids. In meiosis I only the cohesin proteins at the sister chromatid arms are cleaved. This requires meiosis specific components and tight regulation by kinase and phosphatase activities. There is no S-phase between meiotic divisions. Second meiosis resembles mitosis. Mammalian oocytes arrest constitutively at metaphase II in presence of aligned chromosomes, which is due to the activity of the cytostatic factor (CSF). The SAC has been identified in spermatogenesis and oogenesis, but gender-differences may contribute to sex-specific differential responses to aneugens. The age-related reduction in expression of components of the SAC in mammalian oocytes may act synergistically with spindle and other cell organelles' dysfunction, and a partial loss of cohesion between sister chromatids to predispose oocytes to errors in chromosome segregation. This might affect dose-response to aneugens. In view of the tendency to have children at advanced maternal ages it appears relevant to pursue studies on consequences of ageing on the susceptibility of human oocytes to the induction of meiotic error by aneugens and establish models to assess risks to human health by environmental exposures.
                Bookmark

                Author and article information

                Journal
                ofil
                Revista de la OFIL
                Rev. OFIL·ILAPHAR
                Organización de Farmacéuticos Ibero-Latinoamericanos (Madrid, Madrid, Spain )
                1131-9429
                1699-714X
                2020
                : 30
                : 3
                : 233-238
                Affiliations
                [1] Seccional Cali orgnameUniversidad Libre orgdiv1Facultad de Ciencias de la Salud orgdiv2Laboratorio de Genética y Biología Molecular Colombia
                Article
                S1699-714X2020000300233 S1699-714X(20)03000300233
                10.4321/s1699-714x2020000300014
                dba2cf9c-4e78-417b-8bc8-c6fe85a97b86

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 03 September 2019
                : 19 June 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 24, Pages: 6
                Product

                SciELO Spain

                Categories
                Originales

                aneuploidies,aneuploidías,polimorfonucleares,centrosomas,proteosomas,microtúbulos,grupos cromosómicos,metotrexate,Artritis reumatoidea,chromosomic group,microtubules,proteasome,centrosome,polymorphonuclear,methotrexate,Rheumatoid arthritis

                Comments

                Comment on this article